Contents of /trunk/mkinitrd-magellan/busybox/shell/ash.c
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Wed Aug 18 21:56:57 2010 UTC (13 years, 10 months ago) by niro
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Wed Aug 18 21:56:57 2010 UTC (13 years, 10 months ago) by niro
File MIME type: text/plain
File size: 290379 byte(s)
-updated to busybox-1.17.1
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * ash shell port for busybox |
4 | * |
5 | * This code is derived from software contributed to Berkeley by |
6 | * Kenneth Almquist. |
7 | * |
8 | * Original BSD copyright notice is retained at the end of this file. |
9 | * |
10 | * Copyright (c) 1989, 1991, 1993, 1994 |
11 | * The Regents of the University of California. All rights reserved. |
12 | * |
13 | * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au> |
14 | * was re-ported from NetBSD and debianized. |
15 | * |
16 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
17 | */ |
18 | |
19 | /* |
20 | * The following should be set to reflect the type of system you have: |
21 | * JOBS -> 1 if you have Berkeley job control, 0 otherwise. |
22 | * define SYSV if you are running under System V. |
23 | * define DEBUG=1 to compile in debugging ('set -o debug' to turn on) |
24 | * define DEBUG=2 to compile in and turn on debugging. |
25 | * |
26 | * When debugging is on, debugging info will be written to ./trace and |
27 | * a quit signal will generate a core dump. |
28 | */ |
29 | #define DEBUG 0 |
30 | /* Tweak debug output verbosity here */ |
31 | #define DEBUG_TIME 0 |
32 | #define DEBUG_PID 1 |
33 | #define DEBUG_SIG 1 |
34 | |
35 | #define PROFILE 0 |
36 | |
37 | #define JOBS ENABLE_ASH_JOB_CONTROL |
38 | |
39 | #include "busybox.h" /* for applet_names */ |
40 | #include <paths.h> |
41 | #include <setjmp.h> |
42 | #include <fnmatch.h> |
43 | #include <sys/times.h> |
44 | |
45 | #include "shell_common.h" |
46 | #include "math.h" |
47 | #if ENABLE_ASH_RANDOM_SUPPORT |
48 | # include "random.h" |
49 | #else |
50 | # define CLEAR_RANDOM_T(rnd) ((void)0) |
51 | #endif |
52 | |
53 | #include "NUM_APPLETS.h" |
54 | #if NUM_APPLETS == 1 |
55 | /* STANDALONE does not make sense, and won't compile */ |
56 | # undef CONFIG_FEATURE_SH_STANDALONE |
57 | # undef ENABLE_FEATURE_SH_STANDALONE |
58 | # undef IF_FEATURE_SH_STANDALONE |
59 | # undef IF_NOT_FEATURE_SH_STANDALONE |
60 | # define ENABLE_FEATURE_SH_STANDALONE 0 |
61 | # define IF_FEATURE_SH_STANDALONE(...) |
62 | # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__ |
63 | #endif |
64 | |
65 | #ifndef PIPE_BUF |
66 | # define PIPE_BUF 4096 /* amount of buffering in a pipe */ |
67 | #endif |
68 | |
69 | #if !BB_MMU |
70 | # error "Do not even bother, ash will not run on NOMMU machine" |
71 | #endif |
72 | |
73 | |
74 | /* ============ Hash table sizes. Configurable. */ |
75 | |
76 | #define VTABSIZE 39 |
77 | #define ATABSIZE 39 |
78 | #define CMDTABLESIZE 31 /* should be prime */ |
79 | |
80 | |
81 | /* ============ Shell options */ |
82 | |
83 | static const char *const optletters_optnames[] = { |
84 | "e" "errexit", |
85 | "f" "noglob", |
86 | "I" "ignoreeof", |
87 | "i" "interactive", |
88 | "m" "monitor", |
89 | "n" "noexec", |
90 | "s" "stdin", |
91 | "x" "xtrace", |
92 | "v" "verbose", |
93 | "C" "noclobber", |
94 | "a" "allexport", |
95 | "b" "notify", |
96 | "u" "nounset", |
97 | "\0" "vi" |
98 | #if ENABLE_ASH_BASH_COMPAT |
99 | ,"\0" "pipefail" |
100 | #endif |
101 | #if DEBUG |
102 | ,"\0" "nolog" |
103 | ,"\0" "debug" |
104 | #endif |
105 | }; |
106 | |
107 | #define optletters(n) optletters_optnames[n][0] |
108 | #define optnames(n) (optletters_optnames[n] + 1) |
109 | |
110 | enum { NOPTS = ARRAY_SIZE(optletters_optnames) }; |
111 | |
112 | |
113 | /* ============ Misc data */ |
114 | |
115 | #define msg_illnum "Illegal number: %s" |
116 | |
117 | /* |
118 | * We enclose jmp_buf in a structure so that we can declare pointers to |
119 | * jump locations. The global variable handler contains the location to |
120 | * jump to when an exception occurs, and the global variable exception_type |
121 | * contains a code identifying the exception. To implement nested |
122 | * exception handlers, the user should save the value of handler on entry |
123 | * to an inner scope, set handler to point to a jmploc structure for the |
124 | * inner scope, and restore handler on exit from the scope. |
125 | */ |
126 | struct jmploc { |
127 | jmp_buf loc; |
128 | }; |
129 | |
130 | struct globals_misc { |
131 | /* pid of main shell */ |
132 | int rootpid; |
133 | /* shell level: 0 for the main shell, 1 for its children, and so on */ |
134 | int shlvl; |
135 | #define rootshell (!shlvl) |
136 | char *minusc; /* argument to -c option */ |
137 | |
138 | char *curdir; // = nullstr; /* current working directory */ |
139 | char *physdir; // = nullstr; /* physical working directory */ |
140 | |
141 | char *arg0; /* value of $0 */ |
142 | |
143 | struct jmploc *exception_handler; |
144 | |
145 | volatile int suppress_int; /* counter */ |
146 | volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */ |
147 | /* last pending signal */ |
148 | volatile /*sig_atomic_t*/ smallint pending_sig; |
149 | smallint exception_type; /* kind of exception (0..5) */ |
150 | /* exceptions */ |
151 | #define EXINT 0 /* SIGINT received */ |
152 | #define EXERROR 1 /* a generic error */ |
153 | #define EXSHELLPROC 2 /* execute a shell procedure */ |
154 | #define EXEXEC 3 /* command execution failed */ |
155 | #define EXEXIT 4 /* exit the shell */ |
156 | #define EXSIG 5 /* trapped signal in wait(1) */ |
157 | |
158 | smallint isloginsh; |
159 | char nullstr[1]; /* zero length string */ |
160 | |
161 | char optlist[NOPTS]; |
162 | #define eflag optlist[0] |
163 | #define fflag optlist[1] |
164 | #define Iflag optlist[2] |
165 | #define iflag optlist[3] |
166 | #define mflag optlist[4] |
167 | #define nflag optlist[5] |
168 | #define sflag optlist[6] |
169 | #define xflag optlist[7] |
170 | #define vflag optlist[8] |
171 | #define Cflag optlist[9] |
172 | #define aflag optlist[10] |
173 | #define bflag optlist[11] |
174 | #define uflag optlist[12] |
175 | #define viflag optlist[13] |
176 | #if ENABLE_ASH_BASH_COMPAT |
177 | # define pipefail optlist[14] |
178 | #else |
179 | # define pipefail 0 |
180 | #endif |
181 | #if DEBUG |
182 | # define nolog optlist[14 + ENABLE_ASH_BASH_COMPAT] |
183 | # define debug optlist[15 + ENABLE_ASH_BASH_COMPAT] |
184 | #endif |
185 | |
186 | /* trap handler commands */ |
187 | /* |
188 | * Sigmode records the current value of the signal handlers for the various |
189 | * modes. A value of zero means that the current handler is not known. |
190 | * S_HARD_IGN indicates that the signal was ignored on entry to the shell. |
191 | */ |
192 | char sigmode[NSIG - 1]; |
193 | #define S_DFL 1 /* default signal handling (SIG_DFL) */ |
194 | #define S_CATCH 2 /* signal is caught */ |
195 | #define S_IGN 3 /* signal is ignored (SIG_IGN) */ |
196 | #define S_HARD_IGN 4 /* signal is ignored permenantly */ |
197 | |
198 | /* indicates specified signal received */ |
199 | uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */ |
200 | uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */ |
201 | char *trap[NSIG]; |
202 | char **trap_ptr; /* used only by "trap hack" */ |
203 | |
204 | /* Rarely referenced stuff */ |
205 | #if ENABLE_ASH_RANDOM_SUPPORT |
206 | random_t random_gen; |
207 | #endif |
208 | pid_t backgndpid; /* pid of last background process */ |
209 | smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */ |
210 | }; |
211 | extern struct globals_misc *const ash_ptr_to_globals_misc; |
212 | #define G_misc (*ash_ptr_to_globals_misc) |
213 | #define rootpid (G_misc.rootpid ) |
214 | #define shlvl (G_misc.shlvl ) |
215 | #define minusc (G_misc.minusc ) |
216 | #define curdir (G_misc.curdir ) |
217 | #define physdir (G_misc.physdir ) |
218 | #define arg0 (G_misc.arg0 ) |
219 | #define exception_handler (G_misc.exception_handler) |
220 | #define exception_type (G_misc.exception_type ) |
221 | #define suppress_int (G_misc.suppress_int ) |
222 | #define pending_int (G_misc.pending_int ) |
223 | #define pending_sig (G_misc.pending_sig ) |
224 | #define isloginsh (G_misc.isloginsh ) |
225 | #define nullstr (G_misc.nullstr ) |
226 | #define optlist (G_misc.optlist ) |
227 | #define sigmode (G_misc.sigmode ) |
228 | #define gotsig (G_misc.gotsig ) |
229 | #define may_have_traps (G_misc.may_have_traps ) |
230 | #define trap (G_misc.trap ) |
231 | #define trap_ptr (G_misc.trap_ptr ) |
232 | #define random_gen (G_misc.random_gen ) |
233 | #define backgndpid (G_misc.backgndpid ) |
234 | #define job_warning (G_misc.job_warning) |
235 | #define INIT_G_misc() do { \ |
236 | (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \ |
237 | barrier(); \ |
238 | curdir = nullstr; \ |
239 | physdir = nullstr; \ |
240 | trap_ptr = trap; \ |
241 | } while (0) |
242 | |
243 | |
244 | /* ============ DEBUG */ |
245 | #if DEBUG |
246 | static void trace_printf(const char *fmt, ...); |
247 | static void trace_vprintf(const char *fmt, va_list va); |
248 | # define TRACE(param) trace_printf param |
249 | # define TRACEV(param) trace_vprintf param |
250 | # define close(fd) do { \ |
251 | int dfd = (fd); \ |
252 | if (close(dfd) < 0) \ |
253 | bb_error_msg("bug on %d: closing %d(0x%x)", \ |
254 | __LINE__, dfd, dfd); \ |
255 | } while (0) |
256 | #else |
257 | # define TRACE(param) |
258 | # define TRACEV(param) |
259 | #endif |
260 | |
261 | |
262 | /* ============ Utility functions */ |
263 | #define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0) |
264 | |
265 | static int isdigit_str9(const char *str) |
266 | { |
267 | int maxlen = 9 + 1; /* max 9 digits: 999999999 */ |
268 | while (--maxlen && isdigit(*str)) |
269 | str++; |
270 | return (*str == '\0'); |
271 | } |
272 | |
273 | static const char *var_end(const char *var) |
274 | { |
275 | while (*var) |
276 | if (*var++ == '=') |
277 | break; |
278 | return var; |
279 | } |
280 | |
281 | |
282 | /* ============ Interrupts / exceptions */ |
283 | /* |
284 | * These macros allow the user to suspend the handling of interrupt signals |
285 | * over a period of time. This is similar to SIGHOLD or to sigblock, but |
286 | * much more efficient and portable. (But hacking the kernel is so much |
287 | * more fun than worrying about efficiency and portability. :-)) |
288 | */ |
289 | #define INT_OFF do { \ |
290 | suppress_int++; \ |
291 | xbarrier(); \ |
292 | } while (0) |
293 | |
294 | /* |
295 | * Called to raise an exception. Since C doesn't include exceptions, we |
296 | * just do a longjmp to the exception handler. The type of exception is |
297 | * stored in the global variable "exception_type". |
298 | */ |
299 | static void raise_exception(int) NORETURN; |
300 | static void |
301 | raise_exception(int e) |
302 | { |
303 | #if DEBUG |
304 | if (exception_handler == NULL) |
305 | abort(); |
306 | #endif |
307 | INT_OFF; |
308 | exception_type = e; |
309 | longjmp(exception_handler->loc, 1); |
310 | } |
311 | #if DEBUG |
312 | #define raise_exception(e) do { \ |
313 | TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \ |
314 | raise_exception(e); \ |
315 | } while (0) |
316 | #endif |
317 | |
318 | /* |
319 | * Called from trap.c when a SIGINT is received. (If the user specifies |
320 | * that SIGINT is to be trapped or ignored using the trap builtin, then |
321 | * this routine is not called.) Suppressint is nonzero when interrupts |
322 | * are held using the INT_OFF macro. (The test for iflag is just |
323 | * defensive programming.) |
324 | */ |
325 | static void raise_interrupt(void) NORETURN; |
326 | static void |
327 | raise_interrupt(void) |
328 | { |
329 | int ex_type; |
330 | |
331 | pending_int = 0; |
332 | /* Signal is not automatically unmasked after it is raised, |
333 | * do it ourself - unmask all signals */ |
334 | sigprocmask_allsigs(SIG_UNBLOCK); |
335 | /* pending_sig = 0; - now done in signal_handler() */ |
336 | |
337 | ex_type = EXSIG; |
338 | if (gotsig[SIGINT - 1] && !trap[SIGINT]) { |
339 | if (!(rootshell && iflag)) { |
340 | /* Kill ourself with SIGINT */ |
341 | signal(SIGINT, SIG_DFL); |
342 | raise(SIGINT); |
343 | } |
344 | ex_type = EXINT; |
345 | } |
346 | raise_exception(ex_type); |
347 | /* NOTREACHED */ |
348 | } |
349 | #if DEBUG |
350 | #define raise_interrupt() do { \ |
351 | TRACE(("raising interrupt on line %d\n", __LINE__)); \ |
352 | raise_interrupt(); \ |
353 | } while (0) |
354 | #endif |
355 | |
356 | static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void |
357 | int_on(void) |
358 | { |
359 | xbarrier(); |
360 | if (--suppress_int == 0 && pending_int) { |
361 | raise_interrupt(); |
362 | } |
363 | } |
364 | #define INT_ON int_on() |
365 | static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void |
366 | force_int_on(void) |
367 | { |
368 | xbarrier(); |
369 | suppress_int = 0; |
370 | if (pending_int) |
371 | raise_interrupt(); |
372 | } |
373 | #define FORCE_INT_ON force_int_on() |
374 | |
375 | #define SAVE_INT(v) ((v) = suppress_int) |
376 | |
377 | #define RESTORE_INT(v) do { \ |
378 | xbarrier(); \ |
379 | suppress_int = (v); \ |
380 | if (suppress_int == 0 && pending_int) \ |
381 | raise_interrupt(); \ |
382 | } while (0) |
383 | |
384 | |
385 | /* ============ Stdout/stderr output */ |
386 | |
387 | static void |
388 | outstr(const char *p, FILE *file) |
389 | { |
390 | INT_OFF; |
391 | fputs(p, file); |
392 | INT_ON; |
393 | } |
394 | |
395 | static void |
396 | flush_stdout_stderr(void) |
397 | { |
398 | INT_OFF; |
399 | fflush_all(); |
400 | INT_ON; |
401 | } |
402 | |
403 | static void |
404 | outcslow(int c, FILE *dest) |
405 | { |
406 | INT_OFF; |
407 | putc(c, dest); |
408 | fflush(dest); |
409 | INT_ON; |
410 | } |
411 | |
412 | static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2))); |
413 | static int |
414 | out1fmt(const char *fmt, ...) |
415 | { |
416 | va_list ap; |
417 | int r; |
418 | |
419 | INT_OFF; |
420 | va_start(ap, fmt); |
421 | r = vprintf(fmt, ap); |
422 | va_end(ap); |
423 | INT_ON; |
424 | return r; |
425 | } |
426 | |
427 | static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4))); |
428 | static int |
429 | fmtstr(char *outbuf, size_t length, const char *fmt, ...) |
430 | { |
431 | va_list ap; |
432 | int ret; |
433 | |
434 | va_start(ap, fmt); |
435 | INT_OFF; |
436 | ret = vsnprintf(outbuf, length, fmt, ap); |
437 | va_end(ap); |
438 | INT_ON; |
439 | return ret; |
440 | } |
441 | |
442 | static void |
443 | out1str(const char *p) |
444 | { |
445 | outstr(p, stdout); |
446 | } |
447 | |
448 | static void |
449 | out2str(const char *p) |
450 | { |
451 | outstr(p, stderr); |
452 | flush_stdout_stderr(); |
453 | } |
454 | |
455 | |
456 | /* ============ Parser structures */ |
457 | |
458 | /* control characters in argument strings */ |
459 | #define CTL_FIRST CTLESC |
460 | #define CTLESC ((unsigned char)'\201') /* escape next character */ |
461 | #define CTLVAR ((unsigned char)'\202') /* variable defn */ |
462 | #define CTLENDVAR ((unsigned char)'\203') |
463 | #define CTLBACKQ ((unsigned char)'\204') |
464 | #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */ |
465 | /* CTLBACKQ | CTLQUOTE == '\205' */ |
466 | #define CTLARI ((unsigned char)'\206') /* arithmetic expression */ |
467 | #define CTLENDARI ((unsigned char)'\207') |
468 | #define CTLQUOTEMARK ((unsigned char)'\210') |
469 | #define CTL_LAST CTLQUOTEMARK |
470 | |
471 | /* variable substitution byte (follows CTLVAR) */ |
472 | #define VSTYPE 0x0f /* type of variable substitution */ |
473 | #define VSNUL 0x10 /* colon--treat the empty string as unset */ |
474 | #define VSQUOTE 0x80 /* inside double quotes--suppress splitting */ |
475 | |
476 | /* values of VSTYPE field */ |
477 | #define VSNORMAL 0x1 /* normal variable: $var or ${var} */ |
478 | #define VSMINUS 0x2 /* ${var-text} */ |
479 | #define VSPLUS 0x3 /* ${var+text} */ |
480 | #define VSQUESTION 0x4 /* ${var?message} */ |
481 | #define VSASSIGN 0x5 /* ${var=text} */ |
482 | #define VSTRIMRIGHT 0x6 /* ${var%pattern} */ |
483 | #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */ |
484 | #define VSTRIMLEFT 0x8 /* ${var#pattern} */ |
485 | #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */ |
486 | #define VSLENGTH 0xa /* ${#var} */ |
487 | #if ENABLE_ASH_BASH_COMPAT |
488 | #define VSSUBSTR 0xc /* ${var:position:length} */ |
489 | #define VSREPLACE 0xd /* ${var/pattern/replacement} */ |
490 | #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */ |
491 | #endif |
492 | |
493 | static const char dolatstr[] ALIGN1 = { |
494 | CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0' |
495 | }; |
496 | |
497 | #define NCMD 0 |
498 | #define NPIPE 1 |
499 | #define NREDIR 2 |
500 | #define NBACKGND 3 |
501 | #define NSUBSHELL 4 |
502 | #define NAND 5 |
503 | #define NOR 6 |
504 | #define NSEMI 7 |
505 | #define NIF 8 |
506 | #define NWHILE 9 |
507 | #define NUNTIL 10 |
508 | #define NFOR 11 |
509 | #define NCASE 12 |
510 | #define NCLIST 13 |
511 | #define NDEFUN 14 |
512 | #define NARG 15 |
513 | #define NTO 16 |
514 | #if ENABLE_ASH_BASH_COMPAT |
515 | #define NTO2 17 |
516 | #endif |
517 | #define NCLOBBER 18 |
518 | #define NFROM 19 |
519 | #define NFROMTO 20 |
520 | #define NAPPEND 21 |
521 | #define NTOFD 22 |
522 | #define NFROMFD 23 |
523 | #define NHERE 24 |
524 | #define NXHERE 25 |
525 | #define NNOT 26 |
526 | #define N_NUMBER 27 |
527 | |
528 | union node; |
529 | |
530 | struct ncmd { |
531 | smallint type; /* Nxxxx */ |
532 | union node *assign; |
533 | union node *args; |
534 | union node *redirect; |
535 | }; |
536 | |
537 | struct npipe { |
538 | smallint type; |
539 | smallint pipe_backgnd; |
540 | struct nodelist *cmdlist; |
541 | }; |
542 | |
543 | struct nredir { |
544 | smallint type; |
545 | union node *n; |
546 | union node *redirect; |
547 | }; |
548 | |
549 | struct nbinary { |
550 | smallint type; |
551 | union node *ch1; |
552 | union node *ch2; |
553 | }; |
554 | |
555 | struct nif { |
556 | smallint type; |
557 | union node *test; |
558 | union node *ifpart; |
559 | union node *elsepart; |
560 | }; |
561 | |
562 | struct nfor { |
563 | smallint type; |
564 | union node *args; |
565 | union node *body; |
566 | char *var; |
567 | }; |
568 | |
569 | struct ncase { |
570 | smallint type; |
571 | union node *expr; |
572 | union node *cases; |
573 | }; |
574 | |
575 | struct nclist { |
576 | smallint type; |
577 | union node *next; |
578 | union node *pattern; |
579 | union node *body; |
580 | }; |
581 | |
582 | struct narg { |
583 | smallint type; |
584 | union node *next; |
585 | char *text; |
586 | struct nodelist *backquote; |
587 | }; |
588 | |
589 | /* nfile and ndup layout must match! |
590 | * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight |
591 | * that it is actually NTO2 (>&file), and change its type. |
592 | */ |
593 | struct nfile { |
594 | smallint type; |
595 | union node *next; |
596 | int fd; |
597 | int _unused_dupfd; |
598 | union node *fname; |
599 | char *expfname; |
600 | }; |
601 | |
602 | struct ndup { |
603 | smallint type; |
604 | union node *next; |
605 | int fd; |
606 | int dupfd; |
607 | union node *vname; |
608 | char *_unused_expfname; |
609 | }; |
610 | |
611 | struct nhere { |
612 | smallint type; |
613 | union node *next; |
614 | int fd; |
615 | union node *doc; |
616 | }; |
617 | |
618 | struct nnot { |
619 | smallint type; |
620 | union node *com; |
621 | }; |
622 | |
623 | union node { |
624 | smallint type; |
625 | struct ncmd ncmd; |
626 | struct npipe npipe; |
627 | struct nredir nredir; |
628 | struct nbinary nbinary; |
629 | struct nif nif; |
630 | struct nfor nfor; |
631 | struct ncase ncase; |
632 | struct nclist nclist; |
633 | struct narg narg; |
634 | struct nfile nfile; |
635 | struct ndup ndup; |
636 | struct nhere nhere; |
637 | struct nnot nnot; |
638 | }; |
639 | |
640 | /* |
641 | * NODE_EOF is returned by parsecmd when it encounters an end of file. |
642 | * It must be distinct from NULL. |
643 | */ |
644 | #define NODE_EOF ((union node *) -1L) |
645 | |
646 | struct nodelist { |
647 | struct nodelist *next; |
648 | union node *n; |
649 | }; |
650 | |
651 | struct funcnode { |
652 | int count; |
653 | union node n; |
654 | }; |
655 | |
656 | /* |
657 | * Free a parse tree. |
658 | */ |
659 | static void |
660 | freefunc(struct funcnode *f) |
661 | { |
662 | if (f && --f->count < 0) |
663 | free(f); |
664 | } |
665 | |
666 | |
667 | /* ============ Debugging output */ |
668 | |
669 | #if DEBUG |
670 | |
671 | static FILE *tracefile; |
672 | |
673 | static void |
674 | trace_printf(const char *fmt, ...) |
675 | { |
676 | va_list va; |
677 | |
678 | if (debug != 1) |
679 | return; |
680 | if (DEBUG_TIME) |
681 | fprintf(tracefile, "%u ", (int) time(NULL)); |
682 | if (DEBUG_PID) |
683 | fprintf(tracefile, "[%u] ", (int) getpid()); |
684 | if (DEBUG_SIG) |
685 | fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int); |
686 | va_start(va, fmt); |
687 | vfprintf(tracefile, fmt, va); |
688 | va_end(va); |
689 | } |
690 | |
691 | static void |
692 | trace_vprintf(const char *fmt, va_list va) |
693 | { |
694 | if (debug != 1) |
695 | return; |
696 | if (DEBUG_TIME) |
697 | fprintf(tracefile, "%u ", (int) time(NULL)); |
698 | if (DEBUG_PID) |
699 | fprintf(tracefile, "[%u] ", (int) getpid()); |
700 | if (DEBUG_SIG) |
701 | fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int); |
702 | vfprintf(tracefile, fmt, va); |
703 | } |
704 | |
705 | static void |
706 | trace_puts(const char *s) |
707 | { |
708 | if (debug != 1) |
709 | return; |
710 | fputs(s, tracefile); |
711 | } |
712 | |
713 | static void |
714 | trace_puts_quoted(char *s) |
715 | { |
716 | char *p; |
717 | char c; |
718 | |
719 | if (debug != 1) |
720 | return; |
721 | putc('"', tracefile); |
722 | for (p = s; *p; p++) { |
723 | switch ((unsigned char)*p) { |
724 | case '\n': c = 'n'; goto backslash; |
725 | case '\t': c = 't'; goto backslash; |
726 | case '\r': c = 'r'; goto backslash; |
727 | case '\"': c = '\"'; goto backslash; |
728 | case '\\': c = '\\'; goto backslash; |
729 | case CTLESC: c = 'e'; goto backslash; |
730 | case CTLVAR: c = 'v'; goto backslash; |
731 | case CTLVAR+CTLQUOTE: c = 'V'; goto backslash; |
732 | case CTLBACKQ: c = 'q'; goto backslash; |
733 | case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash; |
734 | backslash: |
735 | putc('\\', tracefile); |
736 | putc(c, tracefile); |
737 | break; |
738 | default: |
739 | if (*p >= ' ' && *p <= '~') |
740 | putc(*p, tracefile); |
741 | else { |
742 | putc('\\', tracefile); |
743 | putc((*p >> 6) & 03, tracefile); |
744 | putc((*p >> 3) & 07, tracefile); |
745 | putc(*p & 07, tracefile); |
746 | } |
747 | break; |
748 | } |
749 | } |
750 | putc('"', tracefile); |
751 | } |
752 | |
753 | static void |
754 | trace_puts_args(char **ap) |
755 | { |
756 | if (debug != 1) |
757 | return; |
758 | if (!*ap) |
759 | return; |
760 | while (1) { |
761 | trace_puts_quoted(*ap); |
762 | if (!*++ap) { |
763 | putc('\n', tracefile); |
764 | break; |
765 | } |
766 | putc(' ', tracefile); |
767 | } |
768 | } |
769 | |
770 | static void |
771 | opentrace(void) |
772 | { |
773 | char s[100]; |
774 | #ifdef O_APPEND |
775 | int flags; |
776 | #endif |
777 | |
778 | if (debug != 1) { |
779 | if (tracefile) |
780 | fflush(tracefile); |
781 | /* leave open because libedit might be using it */ |
782 | return; |
783 | } |
784 | strcpy(s, "./trace"); |
785 | if (tracefile) { |
786 | if (!freopen(s, "a", tracefile)) { |
787 | fprintf(stderr, "Can't re-open %s\n", s); |
788 | debug = 0; |
789 | return; |
790 | } |
791 | } else { |
792 | tracefile = fopen(s, "a"); |
793 | if (tracefile == NULL) { |
794 | fprintf(stderr, "Can't open %s\n", s); |
795 | debug = 0; |
796 | return; |
797 | } |
798 | } |
799 | #ifdef O_APPEND |
800 | flags = fcntl(fileno(tracefile), F_GETFL); |
801 | if (flags >= 0) |
802 | fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND); |
803 | #endif |
804 | setlinebuf(tracefile); |
805 | fputs("\nTracing started.\n", tracefile); |
806 | } |
807 | |
808 | static void |
809 | indent(int amount, char *pfx, FILE *fp) |
810 | { |
811 | int i; |
812 | |
813 | for (i = 0; i < amount; i++) { |
814 | if (pfx && i == amount - 1) |
815 | fputs(pfx, fp); |
816 | putc('\t', fp); |
817 | } |
818 | } |
819 | |
820 | /* little circular references here... */ |
821 | static void shtree(union node *n, int ind, char *pfx, FILE *fp); |
822 | |
823 | static void |
824 | sharg(union node *arg, FILE *fp) |
825 | { |
826 | char *p; |
827 | struct nodelist *bqlist; |
828 | unsigned char subtype; |
829 | |
830 | if (arg->type != NARG) { |
831 | out1fmt("<node type %d>\n", arg->type); |
832 | abort(); |
833 | } |
834 | bqlist = arg->narg.backquote; |
835 | for (p = arg->narg.text; *p; p++) { |
836 | switch ((unsigned char)*p) { |
837 | case CTLESC: |
838 | putc(*++p, fp); |
839 | break; |
840 | case CTLVAR: |
841 | putc('$', fp); |
842 | putc('{', fp); |
843 | subtype = *++p; |
844 | if (subtype == VSLENGTH) |
845 | putc('#', fp); |
846 | |
847 | while (*p != '=') |
848 | putc(*p++, fp); |
849 | |
850 | if (subtype & VSNUL) |
851 | putc(':', fp); |
852 | |
853 | switch (subtype & VSTYPE) { |
854 | case VSNORMAL: |
855 | putc('}', fp); |
856 | break; |
857 | case VSMINUS: |
858 | putc('-', fp); |
859 | break; |
860 | case VSPLUS: |
861 | putc('+', fp); |
862 | break; |
863 | case VSQUESTION: |
864 | putc('?', fp); |
865 | break; |
866 | case VSASSIGN: |
867 | putc('=', fp); |
868 | break; |
869 | case VSTRIMLEFT: |
870 | putc('#', fp); |
871 | break; |
872 | case VSTRIMLEFTMAX: |
873 | putc('#', fp); |
874 | putc('#', fp); |
875 | break; |
876 | case VSTRIMRIGHT: |
877 | putc('%', fp); |
878 | break; |
879 | case VSTRIMRIGHTMAX: |
880 | putc('%', fp); |
881 | putc('%', fp); |
882 | break; |
883 | case VSLENGTH: |
884 | break; |
885 | default: |
886 | out1fmt("<subtype %d>", subtype); |
887 | } |
888 | break; |
889 | case CTLENDVAR: |
890 | putc('}', fp); |
891 | break; |
892 | case CTLBACKQ: |
893 | case CTLBACKQ|CTLQUOTE: |
894 | putc('$', fp); |
895 | putc('(', fp); |
896 | shtree(bqlist->n, -1, NULL, fp); |
897 | putc(')', fp); |
898 | break; |
899 | default: |
900 | putc(*p, fp); |
901 | break; |
902 | } |
903 | } |
904 | } |
905 | |
906 | static void |
907 | shcmd(union node *cmd, FILE *fp) |
908 | { |
909 | union node *np; |
910 | int first; |
911 | const char *s; |
912 | int dftfd; |
913 | |
914 | first = 1; |
915 | for (np = cmd->ncmd.args; np; np = np->narg.next) { |
916 | if (!first) |
917 | putc(' ', fp); |
918 | sharg(np, fp); |
919 | first = 0; |
920 | } |
921 | for (np = cmd->ncmd.redirect; np; np = np->nfile.next) { |
922 | if (!first) |
923 | putc(' ', fp); |
924 | dftfd = 0; |
925 | switch (np->nfile.type) { |
926 | case NTO: s = ">>"+1; dftfd = 1; break; |
927 | case NCLOBBER: s = ">|"; dftfd = 1; break; |
928 | case NAPPEND: s = ">>"; dftfd = 1; break; |
929 | #if ENABLE_ASH_BASH_COMPAT |
930 | case NTO2: |
931 | #endif |
932 | case NTOFD: s = ">&"; dftfd = 1; break; |
933 | case NFROM: s = "<"; break; |
934 | case NFROMFD: s = "<&"; break; |
935 | case NFROMTO: s = "<>"; break; |
936 | default: s = "*error*"; break; |
937 | } |
938 | if (np->nfile.fd != dftfd) |
939 | fprintf(fp, "%d", np->nfile.fd); |
940 | fputs(s, fp); |
941 | if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) { |
942 | fprintf(fp, "%d", np->ndup.dupfd); |
943 | } else { |
944 | sharg(np->nfile.fname, fp); |
945 | } |
946 | first = 0; |
947 | } |
948 | } |
949 | |
950 | static void |
951 | shtree(union node *n, int ind, char *pfx, FILE *fp) |
952 | { |
953 | struct nodelist *lp; |
954 | const char *s; |
955 | |
956 | if (n == NULL) |
957 | return; |
958 | |
959 | indent(ind, pfx, fp); |
960 | |
961 | if (n == NODE_EOF) { |
962 | fputs("<EOF>", fp); |
963 | return; |
964 | } |
965 | |
966 | switch (n->type) { |
967 | case NSEMI: |
968 | s = "; "; |
969 | goto binop; |
970 | case NAND: |
971 | s = " && "; |
972 | goto binop; |
973 | case NOR: |
974 | s = " || "; |
975 | binop: |
976 | shtree(n->nbinary.ch1, ind, NULL, fp); |
977 | /* if (ind < 0) */ |
978 | fputs(s, fp); |
979 | shtree(n->nbinary.ch2, ind, NULL, fp); |
980 | break; |
981 | case NCMD: |
982 | shcmd(n, fp); |
983 | if (ind >= 0) |
984 | putc('\n', fp); |
985 | break; |
986 | case NPIPE: |
987 | for (lp = n->npipe.cmdlist; lp; lp = lp->next) { |
988 | shtree(lp->n, 0, NULL, fp); |
989 | if (lp->next) |
990 | fputs(" | ", fp); |
991 | } |
992 | if (n->npipe.pipe_backgnd) |
993 | fputs(" &", fp); |
994 | if (ind >= 0) |
995 | putc('\n', fp); |
996 | break; |
997 | default: |
998 | fprintf(fp, "<node type %d>", n->type); |
999 | if (ind >= 0) |
1000 | putc('\n', fp); |
1001 | break; |
1002 | } |
1003 | } |
1004 | |
1005 | static void |
1006 | showtree(union node *n) |
1007 | { |
1008 | trace_puts("showtree called\n"); |
1009 | shtree(n, 1, NULL, stderr); |
1010 | } |
1011 | |
1012 | #endif /* DEBUG */ |
1013 | |
1014 | |
1015 | /* ============ Parser data */ |
1016 | |
1017 | /* |
1018 | * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up. |
1019 | */ |
1020 | struct strlist { |
1021 | struct strlist *next; |
1022 | char *text; |
1023 | }; |
1024 | |
1025 | struct alias; |
1026 | |
1027 | struct strpush { |
1028 | struct strpush *prev; /* preceding string on stack */ |
1029 | char *prev_string; |
1030 | int prev_left_in_line; |
1031 | #if ENABLE_ASH_ALIAS |
1032 | struct alias *ap; /* if push was associated with an alias */ |
1033 | #endif |
1034 | char *string; /* remember the string since it may change */ |
1035 | }; |
1036 | |
1037 | struct parsefile { |
1038 | struct parsefile *prev; /* preceding file on stack */ |
1039 | int linno; /* current line */ |
1040 | int pf_fd; /* file descriptor (or -1 if string) */ |
1041 | int left_in_line; /* number of chars left in this line */ |
1042 | int left_in_buffer; /* number of chars left in this buffer past the line */ |
1043 | char *next_to_pgetc; /* next char in buffer */ |
1044 | char *buf; /* input buffer */ |
1045 | struct strpush *strpush; /* for pushing strings at this level */ |
1046 | struct strpush basestrpush; /* so pushing one is fast */ |
1047 | }; |
1048 | |
1049 | static struct parsefile basepf; /* top level input file */ |
1050 | static struct parsefile *g_parsefile = &basepf; /* current input file */ |
1051 | static int startlinno; /* line # where last token started */ |
1052 | static char *commandname; /* currently executing command */ |
1053 | static struct strlist *cmdenviron; /* environment for builtin command */ |
1054 | static uint8_t exitstatus; /* exit status of last command */ |
1055 | |
1056 | |
1057 | /* ============ Message printing */ |
1058 | |
1059 | static void |
1060 | ash_vmsg(const char *msg, va_list ap) |
1061 | { |
1062 | fprintf(stderr, "%s: ", arg0); |
1063 | if (commandname) { |
1064 | if (strcmp(arg0, commandname)) |
1065 | fprintf(stderr, "%s: ", commandname); |
1066 | if (!iflag || g_parsefile->pf_fd > 0) |
1067 | fprintf(stderr, "line %d: ", startlinno); |
1068 | } |
1069 | vfprintf(stderr, msg, ap); |
1070 | outcslow('\n', stderr); |
1071 | } |
1072 | |
1073 | /* |
1074 | * Exverror is called to raise the error exception. If the second argument |
1075 | * is not NULL then error prints an error message using printf style |
1076 | * formatting. It then raises the error exception. |
1077 | */ |
1078 | static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN; |
1079 | static void |
1080 | ash_vmsg_and_raise(int cond, const char *msg, va_list ap) |
1081 | { |
1082 | #if DEBUG |
1083 | if (msg) { |
1084 | TRACE(("ash_vmsg_and_raise(%d, \"", cond)); |
1085 | TRACEV((msg, ap)); |
1086 | TRACE(("\") pid=%d\n", getpid())); |
1087 | } else |
1088 | TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid())); |
1089 | if (msg) |
1090 | #endif |
1091 | ash_vmsg(msg, ap); |
1092 | |
1093 | flush_stdout_stderr(); |
1094 | raise_exception(cond); |
1095 | /* NOTREACHED */ |
1096 | } |
1097 | |
1098 | static void ash_msg_and_raise_error(const char *, ...) NORETURN; |
1099 | static void |
1100 | ash_msg_and_raise_error(const char *msg, ...) |
1101 | { |
1102 | va_list ap; |
1103 | |
1104 | va_start(ap, msg); |
1105 | ash_vmsg_and_raise(EXERROR, msg, ap); |
1106 | /* NOTREACHED */ |
1107 | va_end(ap); |
1108 | } |
1109 | |
1110 | static void raise_error_syntax(const char *) NORETURN; |
1111 | static void |
1112 | raise_error_syntax(const char *msg) |
1113 | { |
1114 | ash_msg_and_raise_error("syntax error: %s", msg); |
1115 | /* NOTREACHED */ |
1116 | } |
1117 | |
1118 | static void ash_msg_and_raise(int, const char *, ...) NORETURN; |
1119 | static void |
1120 | ash_msg_and_raise(int cond, const char *msg, ...) |
1121 | { |
1122 | va_list ap; |
1123 | |
1124 | va_start(ap, msg); |
1125 | ash_vmsg_and_raise(cond, msg, ap); |
1126 | /* NOTREACHED */ |
1127 | va_end(ap); |
1128 | } |
1129 | |
1130 | /* |
1131 | * error/warning routines for external builtins |
1132 | */ |
1133 | static void |
1134 | ash_msg(const char *fmt, ...) |
1135 | { |
1136 | va_list ap; |
1137 | |
1138 | va_start(ap, fmt); |
1139 | ash_vmsg(fmt, ap); |
1140 | va_end(ap); |
1141 | } |
1142 | |
1143 | /* |
1144 | * Return a string describing an error. The returned string may be a |
1145 | * pointer to a static buffer that will be overwritten on the next call. |
1146 | * Action describes the operation that got the error. |
1147 | */ |
1148 | static const char * |
1149 | errmsg(int e, const char *em) |
1150 | { |
1151 | if (e == ENOENT || e == ENOTDIR) { |
1152 | return em; |
1153 | } |
1154 | return strerror(e); |
1155 | } |
1156 | |
1157 | |
1158 | /* ============ Memory allocation */ |
1159 | |
1160 | #if 0 |
1161 | /* I consider these wrappers nearly useless: |
1162 | * ok, they return you to nearest exception handler, but |
1163 | * how much memory do you leak in the process, making |
1164 | * memory starvation worse? |
1165 | */ |
1166 | static void * |
1167 | ckrealloc(void * p, size_t nbytes) |
1168 | { |
1169 | p = realloc(p, nbytes); |
1170 | if (!p) |
1171 | ash_msg_and_raise_error(bb_msg_memory_exhausted); |
1172 | return p; |
1173 | } |
1174 | |
1175 | static void * |
1176 | ckmalloc(size_t nbytes) |
1177 | { |
1178 | return ckrealloc(NULL, nbytes); |
1179 | } |
1180 | |
1181 | static void * |
1182 | ckzalloc(size_t nbytes) |
1183 | { |
1184 | return memset(ckmalloc(nbytes), 0, nbytes); |
1185 | } |
1186 | |
1187 | static char * |
1188 | ckstrdup(const char *s) |
1189 | { |
1190 | char *p = strdup(s); |
1191 | if (!p) |
1192 | ash_msg_and_raise_error(bb_msg_memory_exhausted); |
1193 | return p; |
1194 | } |
1195 | #else |
1196 | /* Using bbox equivalents. They exit if out of memory */ |
1197 | # define ckrealloc xrealloc |
1198 | # define ckmalloc xmalloc |
1199 | # define ckzalloc xzalloc |
1200 | # define ckstrdup xstrdup |
1201 | #endif |
1202 | |
1203 | /* |
1204 | * It appears that grabstackstr() will barf with such alignments |
1205 | * because stalloc() will return a string allocated in a new stackblock. |
1206 | */ |
1207 | #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE) |
1208 | enum { |
1209 | /* Most machines require the value returned from malloc to be aligned |
1210 | * in some way. The following macro will get this right |
1211 | * on many machines. */ |
1212 | SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1, |
1213 | /* Minimum size of a block */ |
1214 | MINSIZE = SHELL_ALIGN(504), |
1215 | }; |
1216 | |
1217 | struct stack_block { |
1218 | struct stack_block *prev; |
1219 | char space[MINSIZE]; |
1220 | }; |
1221 | |
1222 | struct stackmark { |
1223 | struct stack_block *stackp; |
1224 | char *stacknxt; |
1225 | size_t stacknleft; |
1226 | struct stackmark *marknext; |
1227 | }; |
1228 | |
1229 | |
1230 | struct globals_memstack { |
1231 | struct stack_block *g_stackp; // = &stackbase; |
1232 | struct stackmark *markp; |
1233 | char *g_stacknxt; // = stackbase.space; |
1234 | char *sstrend; // = stackbase.space + MINSIZE; |
1235 | size_t g_stacknleft; // = MINSIZE; |
1236 | int herefd; // = -1; |
1237 | struct stack_block stackbase; |
1238 | }; |
1239 | extern struct globals_memstack *const ash_ptr_to_globals_memstack; |
1240 | #define G_memstack (*ash_ptr_to_globals_memstack) |
1241 | #define g_stackp (G_memstack.g_stackp ) |
1242 | #define markp (G_memstack.markp ) |
1243 | #define g_stacknxt (G_memstack.g_stacknxt ) |
1244 | #define sstrend (G_memstack.sstrend ) |
1245 | #define g_stacknleft (G_memstack.g_stacknleft) |
1246 | #define herefd (G_memstack.herefd ) |
1247 | #define stackbase (G_memstack.stackbase ) |
1248 | #define INIT_G_memstack() do { \ |
1249 | (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \ |
1250 | barrier(); \ |
1251 | g_stackp = &stackbase; \ |
1252 | g_stacknxt = stackbase.space; \ |
1253 | g_stacknleft = MINSIZE; \ |
1254 | sstrend = stackbase.space + MINSIZE; \ |
1255 | herefd = -1; \ |
1256 | } while (0) |
1257 | |
1258 | |
1259 | #define stackblock() ((void *)g_stacknxt) |
1260 | #define stackblocksize() g_stacknleft |
1261 | |
1262 | /* |
1263 | * Parse trees for commands are allocated in lifo order, so we use a stack |
1264 | * to make this more efficient, and also to avoid all sorts of exception |
1265 | * handling code to handle interrupts in the middle of a parse. |
1266 | * |
1267 | * The size 504 was chosen because the Ultrix malloc handles that size |
1268 | * well. |
1269 | */ |
1270 | static void * |
1271 | stalloc(size_t nbytes) |
1272 | { |
1273 | char *p; |
1274 | size_t aligned; |
1275 | |
1276 | aligned = SHELL_ALIGN(nbytes); |
1277 | if (aligned > g_stacknleft) { |
1278 | size_t len; |
1279 | size_t blocksize; |
1280 | struct stack_block *sp; |
1281 | |
1282 | blocksize = aligned; |
1283 | if (blocksize < MINSIZE) |
1284 | blocksize = MINSIZE; |
1285 | len = sizeof(struct stack_block) - MINSIZE + blocksize; |
1286 | if (len < blocksize) |
1287 | ash_msg_and_raise_error(bb_msg_memory_exhausted); |
1288 | INT_OFF; |
1289 | sp = ckmalloc(len); |
1290 | sp->prev = g_stackp; |
1291 | g_stacknxt = sp->space; |
1292 | g_stacknleft = blocksize; |
1293 | sstrend = g_stacknxt + blocksize; |
1294 | g_stackp = sp; |
1295 | INT_ON; |
1296 | } |
1297 | p = g_stacknxt; |
1298 | g_stacknxt += aligned; |
1299 | g_stacknleft -= aligned; |
1300 | return p; |
1301 | } |
1302 | |
1303 | static void * |
1304 | stzalloc(size_t nbytes) |
1305 | { |
1306 | return memset(stalloc(nbytes), 0, nbytes); |
1307 | } |
1308 | |
1309 | static void |
1310 | stunalloc(void *p) |
1311 | { |
1312 | #if DEBUG |
1313 | if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) { |
1314 | write(STDERR_FILENO, "stunalloc\n", 10); |
1315 | abort(); |
1316 | } |
1317 | #endif |
1318 | g_stacknleft += g_stacknxt - (char *)p; |
1319 | g_stacknxt = p; |
1320 | } |
1321 | |
1322 | /* |
1323 | * Like strdup but works with the ash stack. |
1324 | */ |
1325 | static char * |
1326 | ststrdup(const char *p) |
1327 | { |
1328 | size_t len = strlen(p) + 1; |
1329 | return memcpy(stalloc(len), p, len); |
1330 | } |
1331 | |
1332 | static void |
1333 | setstackmark(struct stackmark *mark) |
1334 | { |
1335 | mark->stackp = g_stackp; |
1336 | mark->stacknxt = g_stacknxt; |
1337 | mark->stacknleft = g_stacknleft; |
1338 | mark->marknext = markp; |
1339 | markp = mark; |
1340 | } |
1341 | |
1342 | static void |
1343 | popstackmark(struct stackmark *mark) |
1344 | { |
1345 | struct stack_block *sp; |
1346 | |
1347 | if (!mark->stackp) |
1348 | return; |
1349 | |
1350 | INT_OFF; |
1351 | markp = mark->marknext; |
1352 | while (g_stackp != mark->stackp) { |
1353 | sp = g_stackp; |
1354 | g_stackp = sp->prev; |
1355 | free(sp); |
1356 | } |
1357 | g_stacknxt = mark->stacknxt; |
1358 | g_stacknleft = mark->stacknleft; |
1359 | sstrend = mark->stacknxt + mark->stacknleft; |
1360 | INT_ON; |
1361 | } |
1362 | |
1363 | /* |
1364 | * When the parser reads in a string, it wants to stick the string on the |
1365 | * stack and only adjust the stack pointer when it knows how big the |
1366 | * string is. Stackblock (defined in stack.h) returns a pointer to a block |
1367 | * of space on top of the stack and stackblocklen returns the length of |
1368 | * this block. Growstackblock will grow this space by at least one byte, |
1369 | * possibly moving it (like realloc). Grabstackblock actually allocates the |
1370 | * part of the block that has been used. |
1371 | */ |
1372 | static void |
1373 | growstackblock(void) |
1374 | { |
1375 | size_t newlen; |
1376 | |
1377 | newlen = g_stacknleft * 2; |
1378 | if (newlen < g_stacknleft) |
1379 | ash_msg_and_raise_error(bb_msg_memory_exhausted); |
1380 | if (newlen < 128) |
1381 | newlen += 128; |
1382 | |
1383 | if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) { |
1384 | struct stack_block *oldstackp; |
1385 | struct stackmark *xmark; |
1386 | struct stack_block *sp; |
1387 | struct stack_block *prevstackp; |
1388 | size_t grosslen; |
1389 | |
1390 | INT_OFF; |
1391 | oldstackp = g_stackp; |
1392 | sp = g_stackp; |
1393 | prevstackp = sp->prev; |
1394 | grosslen = newlen + sizeof(struct stack_block) - MINSIZE; |
1395 | sp = ckrealloc(sp, grosslen); |
1396 | sp->prev = prevstackp; |
1397 | g_stackp = sp; |
1398 | g_stacknxt = sp->space; |
1399 | g_stacknleft = newlen; |
1400 | sstrend = sp->space + newlen; |
1401 | |
1402 | /* |
1403 | * Stack marks pointing to the start of the old block |
1404 | * must be relocated to point to the new block |
1405 | */ |
1406 | xmark = markp; |
1407 | while (xmark != NULL && xmark->stackp == oldstackp) { |
1408 | xmark->stackp = g_stackp; |
1409 | xmark->stacknxt = g_stacknxt; |
1410 | xmark->stacknleft = g_stacknleft; |
1411 | xmark = xmark->marknext; |
1412 | } |
1413 | INT_ON; |
1414 | } else { |
1415 | char *oldspace = g_stacknxt; |
1416 | size_t oldlen = g_stacknleft; |
1417 | char *p = stalloc(newlen); |
1418 | |
1419 | /* free the space we just allocated */ |
1420 | g_stacknxt = memcpy(p, oldspace, oldlen); |
1421 | g_stacknleft += newlen; |
1422 | } |
1423 | } |
1424 | |
1425 | static void |
1426 | grabstackblock(size_t len) |
1427 | { |
1428 | len = SHELL_ALIGN(len); |
1429 | g_stacknxt += len; |
1430 | g_stacknleft -= len; |
1431 | } |
1432 | |
1433 | /* |
1434 | * The following routines are somewhat easier to use than the above. |
1435 | * The user declares a variable of type STACKSTR, which may be declared |
1436 | * to be a register. The macro STARTSTACKSTR initializes things. Then |
1437 | * the user uses the macro STPUTC to add characters to the string. In |
1438 | * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is |
1439 | * grown as necessary. When the user is done, she can just leave the |
1440 | * string there and refer to it using stackblock(). Or she can allocate |
1441 | * the space for it using grabstackstr(). If it is necessary to allow |
1442 | * someone else to use the stack temporarily and then continue to grow |
1443 | * the string, the user should use grabstack to allocate the space, and |
1444 | * then call ungrabstr(p) to return to the previous mode of operation. |
1445 | * |
1446 | * USTPUTC is like STPUTC except that it doesn't check for overflow. |
1447 | * CHECKSTACKSPACE can be called before USTPUTC to ensure that there |
1448 | * is space for at least one character. |
1449 | */ |
1450 | static void * |
1451 | growstackstr(void) |
1452 | { |
1453 | size_t len = stackblocksize(); |
1454 | if (herefd >= 0 && len >= 1024) { |
1455 | full_write(herefd, stackblock(), len); |
1456 | return stackblock(); |
1457 | } |
1458 | growstackblock(); |
1459 | return (char *)stackblock() + len; |
1460 | } |
1461 | |
1462 | /* |
1463 | * Called from CHECKSTRSPACE. |
1464 | */ |
1465 | static char * |
1466 | makestrspace(size_t newlen, char *p) |
1467 | { |
1468 | size_t len = p - g_stacknxt; |
1469 | size_t size = stackblocksize(); |
1470 | |
1471 | for (;;) { |
1472 | size_t nleft; |
1473 | |
1474 | size = stackblocksize(); |
1475 | nleft = size - len; |
1476 | if (nleft >= newlen) |
1477 | break; |
1478 | growstackblock(); |
1479 | } |
1480 | return (char *)stackblock() + len; |
1481 | } |
1482 | |
1483 | static char * |
1484 | stack_nputstr(const char *s, size_t n, char *p) |
1485 | { |
1486 | p = makestrspace(n, p); |
1487 | p = (char *)memcpy(p, s, n) + n; |
1488 | return p; |
1489 | } |
1490 | |
1491 | static char * |
1492 | stack_putstr(const char *s, char *p) |
1493 | { |
1494 | return stack_nputstr(s, strlen(s), p); |
1495 | } |
1496 | |
1497 | static char * |
1498 | _STPUTC(int c, char *p) |
1499 | { |
1500 | if (p == sstrend) |
1501 | p = growstackstr(); |
1502 | *p++ = c; |
1503 | return p; |
1504 | } |
1505 | |
1506 | #define STARTSTACKSTR(p) ((p) = stackblock()) |
1507 | #define STPUTC(c, p) ((p) = _STPUTC((c), (p))) |
1508 | #define CHECKSTRSPACE(n, p) do { \ |
1509 | char *q = (p); \ |
1510 | size_t l = (n); \ |
1511 | size_t m = sstrend - q; \ |
1512 | if (l > m) \ |
1513 | (p) = makestrspace(l, q); \ |
1514 | } while (0) |
1515 | #define USTPUTC(c, p) (*(p)++ = (c)) |
1516 | #define STACKSTRNUL(p) do { \ |
1517 | if ((p) == sstrend) \ |
1518 | (p) = growstackstr(); \ |
1519 | *(p) = '\0'; \ |
1520 | } while (0) |
1521 | #define STUNPUTC(p) (--(p)) |
1522 | #define STTOPC(p) ((p)[-1]) |
1523 | #define STADJUST(amount, p) ((p) += (amount)) |
1524 | |
1525 | #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock()) |
1526 | #define ungrabstackstr(s, p) stunalloc(s) |
1527 | #define stackstrend() ((void *)sstrend) |
1528 | |
1529 | |
1530 | /* ============ String helpers */ |
1531 | |
1532 | /* |
1533 | * prefix -- see if pfx is a prefix of string. |
1534 | */ |
1535 | static char * |
1536 | prefix(const char *string, const char *pfx) |
1537 | { |
1538 | while (*pfx) { |
1539 | if (*pfx++ != *string++) |
1540 | return NULL; |
1541 | } |
1542 | return (char *) string; |
1543 | } |
1544 | |
1545 | /* |
1546 | * Check for a valid number. This should be elsewhere. |
1547 | */ |
1548 | static int |
1549 | is_number(const char *p) |
1550 | { |
1551 | do { |
1552 | if (!isdigit(*p)) |
1553 | return 0; |
1554 | } while (*++p != '\0'); |
1555 | return 1; |
1556 | } |
1557 | |
1558 | /* |
1559 | * Convert a string of digits to an integer, printing an error message on |
1560 | * failure. |
1561 | */ |
1562 | static int |
1563 | number(const char *s) |
1564 | { |
1565 | if (!is_number(s)) |
1566 | ash_msg_and_raise_error(msg_illnum, s); |
1567 | return atoi(s); |
1568 | } |
1569 | |
1570 | /* |
1571 | * Produce a possibly single quoted string suitable as input to the shell. |
1572 | * The return string is allocated on the stack. |
1573 | */ |
1574 | static char * |
1575 | single_quote(const char *s) |
1576 | { |
1577 | char *p; |
1578 | |
1579 | STARTSTACKSTR(p); |
1580 | |
1581 | do { |
1582 | char *q; |
1583 | size_t len; |
1584 | |
1585 | len = strchrnul(s, '\'') - s; |
1586 | |
1587 | q = p = makestrspace(len + 3, p); |
1588 | |
1589 | *q++ = '\''; |
1590 | q = (char *)memcpy(q, s, len) + len; |
1591 | *q++ = '\''; |
1592 | s += len; |
1593 | |
1594 | STADJUST(q - p, p); |
1595 | |
1596 | if (*s != '\'') |
1597 | break; |
1598 | len = 0; |
1599 | do len++; while (*++s == '\''); |
1600 | |
1601 | q = p = makestrspace(len + 3, p); |
1602 | |
1603 | *q++ = '"'; |
1604 | q = (char *)memcpy(q, s - len, len) + len; |
1605 | *q++ = '"'; |
1606 | |
1607 | STADJUST(q - p, p); |
1608 | } while (*s); |
1609 | |
1610 | USTPUTC('\0', p); |
1611 | |
1612 | return stackblock(); |
1613 | } |
1614 | |
1615 | |
1616 | /* ============ nextopt */ |
1617 | |
1618 | static char **argptr; /* argument list for builtin commands */ |
1619 | static char *optionarg; /* set by nextopt (like getopt) */ |
1620 | static char *optptr; /* used by nextopt */ |
1621 | |
1622 | /* |
1623 | * XXX - should get rid of. Have all builtins use getopt(3). |
1624 | * The library getopt must have the BSD extension static variable |
1625 | * "optreset", otherwise it can't be used within the shell safely. |
1626 | * |
1627 | * Standard option processing (a la getopt) for builtin routines. |
1628 | * The only argument that is passed to nextopt is the option string; |
1629 | * the other arguments are unnecessary. It returns the character, |
1630 | * or '\0' on end of input. |
1631 | */ |
1632 | static int |
1633 | nextopt(const char *optstring) |
1634 | { |
1635 | char *p; |
1636 | const char *q; |
1637 | char c; |
1638 | |
1639 | p = optptr; |
1640 | if (p == NULL || *p == '\0') { |
1641 | /* We ate entire "-param", take next one */ |
1642 | p = *argptr; |
1643 | if (p == NULL) |
1644 | return '\0'; |
1645 | if (*p != '-') |
1646 | return '\0'; |
1647 | if (*++p == '\0') /* just "-" ? */ |
1648 | return '\0'; |
1649 | argptr++; |
1650 | if (LONE_DASH(p)) /* "--" ? */ |
1651 | return '\0'; |
1652 | /* p => next "-param" */ |
1653 | } |
1654 | /* p => some option char in the middle of a "-param" */ |
1655 | c = *p++; |
1656 | for (q = optstring; *q != c;) { |
1657 | if (*q == '\0') |
1658 | ash_msg_and_raise_error("illegal option -%c", c); |
1659 | if (*++q == ':') |
1660 | q++; |
1661 | } |
1662 | if (*++q == ':') { |
1663 | if (*p == '\0') { |
1664 | p = *argptr++; |
1665 | if (p == NULL) |
1666 | ash_msg_and_raise_error("no arg for -%c option", c); |
1667 | } |
1668 | optionarg = p; |
1669 | p = NULL; |
1670 | } |
1671 | optptr = p; |
1672 | return c; |
1673 | } |
1674 | |
1675 | |
1676 | /* ============ Shell variables */ |
1677 | |
1678 | /* |
1679 | * The parsefile structure pointed to by the global variable parsefile |
1680 | * contains information about the current file being read. |
1681 | */ |
1682 | struct shparam { |
1683 | int nparam; /* # of positional parameters (without $0) */ |
1684 | #if ENABLE_ASH_GETOPTS |
1685 | int optind; /* next parameter to be processed by getopts */ |
1686 | int optoff; /* used by getopts */ |
1687 | #endif |
1688 | unsigned char malloced; /* if parameter list dynamically allocated */ |
1689 | char **p; /* parameter list */ |
1690 | }; |
1691 | |
1692 | /* |
1693 | * Free the list of positional parameters. |
1694 | */ |
1695 | static void |
1696 | freeparam(volatile struct shparam *param) |
1697 | { |
1698 | if (param->malloced) { |
1699 | char **ap, **ap1; |
1700 | ap = ap1 = param->p; |
1701 | while (*ap) |
1702 | free(*ap++); |
1703 | free(ap1); |
1704 | } |
1705 | } |
1706 | |
1707 | #if ENABLE_ASH_GETOPTS |
1708 | static void FAST_FUNC getoptsreset(const char *value); |
1709 | #endif |
1710 | |
1711 | struct var { |
1712 | struct var *next; /* next entry in hash list */ |
1713 | int flags; /* flags are defined above */ |
1714 | const char *var_text; /* name=value */ |
1715 | void (*var_func)(const char *) FAST_FUNC; /* function to be called when */ |
1716 | /* the variable gets set/unset */ |
1717 | }; |
1718 | |
1719 | struct localvar { |
1720 | struct localvar *next; /* next local variable in list */ |
1721 | struct var *vp; /* the variable that was made local */ |
1722 | int flags; /* saved flags */ |
1723 | const char *text; /* saved text */ |
1724 | }; |
1725 | |
1726 | /* flags */ |
1727 | #define VEXPORT 0x01 /* variable is exported */ |
1728 | #define VREADONLY 0x02 /* variable cannot be modified */ |
1729 | #define VSTRFIXED 0x04 /* variable struct is statically allocated */ |
1730 | #define VTEXTFIXED 0x08 /* text is statically allocated */ |
1731 | #define VSTACK 0x10 /* text is allocated on the stack */ |
1732 | #define VUNSET 0x20 /* the variable is not set */ |
1733 | #define VNOFUNC 0x40 /* don't call the callback function */ |
1734 | #define VNOSET 0x80 /* do not set variable - just readonly test */ |
1735 | #define VNOSAVE 0x100 /* when text is on the heap before setvareq */ |
1736 | #if ENABLE_ASH_RANDOM_SUPPORT |
1737 | # define VDYNAMIC 0x200 /* dynamic variable */ |
1738 | #else |
1739 | # define VDYNAMIC 0 |
1740 | #endif |
1741 | |
1742 | |
1743 | /* Need to be before varinit_data[] */ |
1744 | #if ENABLE_LOCALE_SUPPORT |
1745 | static void FAST_FUNC |
1746 | change_lc_all(const char *value) |
1747 | { |
1748 | if (value && *value != '\0') |
1749 | setlocale(LC_ALL, value); |
1750 | } |
1751 | static void FAST_FUNC |
1752 | change_lc_ctype(const char *value) |
1753 | { |
1754 | if (value && *value != '\0') |
1755 | setlocale(LC_CTYPE, value); |
1756 | } |
1757 | #endif |
1758 | #if ENABLE_ASH_MAIL |
1759 | static void chkmail(void); |
1760 | static void changemail(const char *) FAST_FUNC; |
1761 | #endif |
1762 | static void changepath(const char *) FAST_FUNC; |
1763 | #if ENABLE_ASH_RANDOM_SUPPORT |
1764 | static void change_random(const char *) FAST_FUNC; |
1765 | #endif |
1766 | |
1767 | static const struct { |
1768 | int flags; |
1769 | const char *var_text; |
1770 | void (*var_func)(const char *) FAST_FUNC; |
1771 | } varinit_data[] = { |
1772 | { VSTRFIXED|VTEXTFIXED , defifsvar , NULL }, |
1773 | #if ENABLE_ASH_MAIL |
1774 | { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail }, |
1775 | { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail }, |
1776 | #endif |
1777 | { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath }, |
1778 | { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL }, |
1779 | { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL }, |
1780 | { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL }, |
1781 | #if ENABLE_ASH_GETOPTS |
1782 | { VSTRFIXED|VTEXTFIXED , "OPTIND=1" , getoptsreset }, |
1783 | #endif |
1784 | #if ENABLE_ASH_RANDOM_SUPPORT |
1785 | { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random }, |
1786 | #endif |
1787 | #if ENABLE_LOCALE_SUPPORT |
1788 | { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all }, |
1789 | { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype }, |
1790 | #endif |
1791 | #if ENABLE_FEATURE_EDITING_SAVEHISTORY |
1792 | { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL }, |
1793 | #endif |
1794 | }; |
1795 | |
1796 | struct redirtab; |
1797 | |
1798 | struct globals_var { |
1799 | struct shparam shellparam; /* $@ current positional parameters */ |
1800 | struct redirtab *redirlist; |
1801 | int g_nullredirs; |
1802 | int preverrout_fd; /* save fd2 before print debug if xflag is set. */ |
1803 | struct var *vartab[VTABSIZE]; |
1804 | struct var varinit[ARRAY_SIZE(varinit_data)]; |
1805 | }; |
1806 | extern struct globals_var *const ash_ptr_to_globals_var; |
1807 | #define G_var (*ash_ptr_to_globals_var) |
1808 | #define shellparam (G_var.shellparam ) |
1809 | //#define redirlist (G_var.redirlist ) |
1810 | #define g_nullredirs (G_var.g_nullredirs ) |
1811 | #define preverrout_fd (G_var.preverrout_fd) |
1812 | #define vartab (G_var.vartab ) |
1813 | #define varinit (G_var.varinit ) |
1814 | #define INIT_G_var() do { \ |
1815 | unsigned i; \ |
1816 | (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \ |
1817 | barrier(); \ |
1818 | for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \ |
1819 | varinit[i].flags = varinit_data[i].flags; \ |
1820 | varinit[i].var_text = varinit_data[i].var_text; \ |
1821 | varinit[i].var_func = varinit_data[i].var_func; \ |
1822 | } \ |
1823 | } while (0) |
1824 | |
1825 | #define vifs varinit[0] |
1826 | #if ENABLE_ASH_MAIL |
1827 | # define vmail (&vifs)[1] |
1828 | # define vmpath (&vmail)[1] |
1829 | # define vpath (&vmpath)[1] |
1830 | #else |
1831 | # define vpath (&vifs)[1] |
1832 | #endif |
1833 | #define vps1 (&vpath)[1] |
1834 | #define vps2 (&vps1)[1] |
1835 | #define vps4 (&vps2)[1] |
1836 | #if ENABLE_ASH_GETOPTS |
1837 | # define voptind (&vps4)[1] |
1838 | # if ENABLE_ASH_RANDOM_SUPPORT |
1839 | # define vrandom (&voptind)[1] |
1840 | # endif |
1841 | #else |
1842 | # if ENABLE_ASH_RANDOM_SUPPORT |
1843 | # define vrandom (&vps4)[1] |
1844 | # endif |
1845 | #endif |
1846 | |
1847 | /* |
1848 | * The following macros access the values of the above variables. |
1849 | * They have to skip over the name. They return the null string |
1850 | * for unset variables. |
1851 | */ |
1852 | #define ifsval() (vifs.var_text + 4) |
1853 | #define ifsset() ((vifs.flags & VUNSET) == 0) |
1854 | #if ENABLE_ASH_MAIL |
1855 | # define mailval() (vmail.var_text + 5) |
1856 | # define mpathval() (vmpath.var_text + 9) |
1857 | # define mpathset() ((vmpath.flags & VUNSET) == 0) |
1858 | #endif |
1859 | #define pathval() (vpath.var_text + 5) |
1860 | #define ps1val() (vps1.var_text + 4) |
1861 | #define ps2val() (vps2.var_text + 4) |
1862 | #define ps4val() (vps4.var_text + 4) |
1863 | #if ENABLE_ASH_GETOPTS |
1864 | # define optindval() (voptind.var_text + 7) |
1865 | #endif |
1866 | |
1867 | |
1868 | #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c))) |
1869 | #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c))) |
1870 | |
1871 | #if ENABLE_ASH_GETOPTS |
1872 | static void FAST_FUNC |
1873 | getoptsreset(const char *value) |
1874 | { |
1875 | shellparam.optind = number(value); |
1876 | shellparam.optoff = -1; |
1877 | } |
1878 | #endif |
1879 | |
1880 | /* |
1881 | * Return of a legal variable name (a letter or underscore followed by zero or |
1882 | * more letters, underscores, and digits). |
1883 | */ |
1884 | static char* FAST_FUNC |
1885 | endofname(const char *name) |
1886 | { |
1887 | char *p; |
1888 | |
1889 | p = (char *) name; |
1890 | if (!is_name(*p)) |
1891 | return p; |
1892 | while (*++p) { |
1893 | if (!is_in_name(*p)) |
1894 | break; |
1895 | } |
1896 | return p; |
1897 | } |
1898 | |
1899 | /* |
1900 | * Compares two strings up to the first = or '\0'. The first |
1901 | * string must be terminated by '='; the second may be terminated by |
1902 | * either '=' or '\0'. |
1903 | */ |
1904 | static int |
1905 | varcmp(const char *p, const char *q) |
1906 | { |
1907 | int c, d; |
1908 | |
1909 | while ((c = *p) == (d = *q)) { |
1910 | if (!c || c == '=') |
1911 | goto out; |
1912 | p++; |
1913 | q++; |
1914 | } |
1915 | if (c == '=') |
1916 | c = '\0'; |
1917 | if (d == '=') |
1918 | d = '\0'; |
1919 | out: |
1920 | return c - d; |
1921 | } |
1922 | |
1923 | /* |
1924 | * Find the appropriate entry in the hash table from the name. |
1925 | */ |
1926 | static struct var ** |
1927 | hashvar(const char *p) |
1928 | { |
1929 | unsigned hashval; |
1930 | |
1931 | hashval = ((unsigned char) *p) << 4; |
1932 | while (*p && *p != '=') |
1933 | hashval += (unsigned char) *p++; |
1934 | return &vartab[hashval % VTABSIZE]; |
1935 | } |
1936 | |
1937 | static int |
1938 | vpcmp(const void *a, const void *b) |
1939 | { |
1940 | return varcmp(*(const char **)a, *(const char **)b); |
1941 | } |
1942 | |
1943 | /* |
1944 | * This routine initializes the builtin variables. |
1945 | */ |
1946 | static void |
1947 | initvar(void) |
1948 | { |
1949 | struct var *vp; |
1950 | struct var *end; |
1951 | struct var **vpp; |
1952 | |
1953 | /* |
1954 | * PS1 depends on uid |
1955 | */ |
1956 | #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT |
1957 | vps1.var_text = "PS1=\\w \\$ "; |
1958 | #else |
1959 | if (!geteuid()) |
1960 | vps1.var_text = "PS1=# "; |
1961 | #endif |
1962 | vp = varinit; |
1963 | end = vp + ARRAY_SIZE(varinit); |
1964 | do { |
1965 | vpp = hashvar(vp->var_text); |
1966 | vp->next = *vpp; |
1967 | *vpp = vp; |
1968 | } while (++vp < end); |
1969 | } |
1970 | |
1971 | static struct var ** |
1972 | findvar(struct var **vpp, const char *name) |
1973 | { |
1974 | for (; *vpp; vpp = &(*vpp)->next) { |
1975 | if (varcmp((*vpp)->var_text, name) == 0) { |
1976 | break; |
1977 | } |
1978 | } |
1979 | return vpp; |
1980 | } |
1981 | |
1982 | /* |
1983 | * Find the value of a variable. Returns NULL if not set. |
1984 | */ |
1985 | static const char* FAST_FUNC |
1986 | lookupvar(const char *name) |
1987 | { |
1988 | struct var *v; |
1989 | |
1990 | v = *findvar(hashvar(name), name); |
1991 | if (v) { |
1992 | #if ENABLE_ASH_RANDOM_SUPPORT |
1993 | /* |
1994 | * Dynamic variables are implemented roughly the same way they are |
1995 | * in bash. Namely, they're "special" so long as they aren't unset. |
1996 | * As soon as they're unset, they're no longer dynamic, and dynamic |
1997 | * lookup will no longer happen at that point. -- PFM. |
1998 | */ |
1999 | if (v->flags & VDYNAMIC) |
2000 | v->var_func(NULL); |
2001 | #endif |
2002 | if (!(v->flags & VUNSET)) |
2003 | return var_end(v->var_text); |
2004 | } |
2005 | return NULL; |
2006 | } |
2007 | |
2008 | /* |
2009 | * Search the environment of a builtin command. |
2010 | */ |
2011 | static const char * |
2012 | bltinlookup(const char *name) |
2013 | { |
2014 | struct strlist *sp; |
2015 | |
2016 | for (sp = cmdenviron; sp; sp = sp->next) { |
2017 | if (varcmp(sp->text, name) == 0) |
2018 | return var_end(sp->text); |
2019 | } |
2020 | return lookupvar(name); |
2021 | } |
2022 | |
2023 | /* |
2024 | * Same as setvar except that the variable and value are passed in |
2025 | * the first argument as name=value. Since the first argument will |
2026 | * be actually stored in the table, it should not be a string that |
2027 | * will go away. |
2028 | * Called with interrupts off. |
2029 | */ |
2030 | static void |
2031 | setvareq(char *s, int flags) |
2032 | { |
2033 | struct var *vp, **vpp; |
2034 | |
2035 | vpp = hashvar(s); |
2036 | flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1)); |
2037 | vp = *findvar(vpp, s); |
2038 | if (vp) { |
2039 | if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) { |
2040 | const char *n; |
2041 | |
2042 | if (flags & VNOSAVE) |
2043 | free(s); |
2044 | n = vp->var_text; |
2045 | ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n); |
2046 | } |
2047 | |
2048 | if (flags & VNOSET) |
2049 | return; |
2050 | |
2051 | if (vp->var_func && !(flags & VNOFUNC)) |
2052 | vp->var_func(var_end(s)); |
2053 | |
2054 | if (!(vp->flags & (VTEXTFIXED|VSTACK))) |
2055 | free((char*)vp->var_text); |
2056 | |
2057 | flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET); |
2058 | } else { |
2059 | /* variable s is not found */ |
2060 | if (flags & VNOSET) |
2061 | return; |
2062 | vp = ckzalloc(sizeof(*vp)); |
2063 | vp->next = *vpp; |
2064 | /*vp->func = NULL; - ckzalloc did it */ |
2065 | *vpp = vp; |
2066 | } |
2067 | if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE))) |
2068 | s = ckstrdup(s); |
2069 | vp->var_text = s; |
2070 | vp->flags = flags; |
2071 | } |
2072 | |
2073 | /* |
2074 | * Set the value of a variable. The flags argument is ored with the |
2075 | * flags of the variable. If val is NULL, the variable is unset. |
2076 | */ |
2077 | static void |
2078 | setvar(const char *name, const char *val, int flags) |
2079 | { |
2080 | char *p, *q; |
2081 | size_t namelen; |
2082 | char *nameeq; |
2083 | size_t vallen; |
2084 | |
2085 | q = endofname(name); |
2086 | p = strchrnul(q, '='); |
2087 | namelen = p - name; |
2088 | if (!namelen || p != q) |
2089 | ash_msg_and_raise_error("%.*s: bad variable name", namelen, name); |
2090 | vallen = 0; |
2091 | if (val == NULL) { |
2092 | flags |= VUNSET; |
2093 | } else { |
2094 | vallen = strlen(val); |
2095 | } |
2096 | INT_OFF; |
2097 | nameeq = ckmalloc(namelen + vallen + 2); |
2098 | p = (char *)memcpy(nameeq, name, namelen) + namelen; |
2099 | if (val) { |
2100 | *p++ = '='; |
2101 | p = (char *)memcpy(p, val, vallen) + vallen; |
2102 | } |
2103 | *p = '\0'; |
2104 | setvareq(nameeq, flags | VNOSAVE); |
2105 | INT_ON; |
2106 | } |
2107 | |
2108 | static void FAST_FUNC |
2109 | setvar2(const char *name, const char *val) |
2110 | { |
2111 | setvar(name, val, 0); |
2112 | } |
2113 | |
2114 | #if ENABLE_ASH_GETOPTS |
2115 | /* |
2116 | * Safe version of setvar, returns 1 on success 0 on failure. |
2117 | */ |
2118 | static int |
2119 | setvarsafe(const char *name, const char *val, int flags) |
2120 | { |
2121 | int err; |
2122 | volatile int saveint; |
2123 | struct jmploc *volatile savehandler = exception_handler; |
2124 | struct jmploc jmploc; |
2125 | |
2126 | SAVE_INT(saveint); |
2127 | if (setjmp(jmploc.loc)) |
2128 | err = 1; |
2129 | else { |
2130 | exception_handler = &jmploc; |
2131 | setvar(name, val, flags); |
2132 | err = 0; |
2133 | } |
2134 | exception_handler = savehandler; |
2135 | RESTORE_INT(saveint); |
2136 | return err; |
2137 | } |
2138 | #endif |
2139 | |
2140 | /* |
2141 | * Unset the specified variable. |
2142 | */ |
2143 | static int |
2144 | unsetvar(const char *s) |
2145 | { |
2146 | struct var **vpp; |
2147 | struct var *vp; |
2148 | int retval; |
2149 | |
2150 | vpp = findvar(hashvar(s), s); |
2151 | vp = *vpp; |
2152 | retval = 2; |
2153 | if (vp) { |
2154 | int flags = vp->flags; |
2155 | |
2156 | retval = 1; |
2157 | if (flags & VREADONLY) |
2158 | goto out; |
2159 | #if ENABLE_ASH_RANDOM_SUPPORT |
2160 | vp->flags &= ~VDYNAMIC; |
2161 | #endif |
2162 | if (flags & VUNSET) |
2163 | goto ok; |
2164 | if ((flags & VSTRFIXED) == 0) { |
2165 | INT_OFF; |
2166 | if ((flags & (VTEXTFIXED|VSTACK)) == 0) |
2167 | free((char*)vp->var_text); |
2168 | *vpp = vp->next; |
2169 | free(vp); |
2170 | INT_ON; |
2171 | } else { |
2172 | setvar(s, 0, 0); |
2173 | vp->flags &= ~VEXPORT; |
2174 | } |
2175 | ok: |
2176 | retval = 0; |
2177 | } |
2178 | out: |
2179 | return retval; |
2180 | } |
2181 | |
2182 | /* |
2183 | * Process a linked list of variable assignments. |
2184 | */ |
2185 | static void |
2186 | listsetvar(struct strlist *list_set_var, int flags) |
2187 | { |
2188 | struct strlist *lp = list_set_var; |
2189 | |
2190 | if (!lp) |
2191 | return; |
2192 | INT_OFF; |
2193 | do { |
2194 | setvareq(lp->text, flags); |
2195 | lp = lp->next; |
2196 | } while (lp); |
2197 | INT_ON; |
2198 | } |
2199 | |
2200 | /* |
2201 | * Generate a list of variables satisfying the given conditions. |
2202 | */ |
2203 | static char ** |
2204 | listvars(int on, int off, char ***end) |
2205 | { |
2206 | struct var **vpp; |
2207 | struct var *vp; |
2208 | char **ep; |
2209 | int mask; |
2210 | |
2211 | STARTSTACKSTR(ep); |
2212 | vpp = vartab; |
2213 | mask = on | off; |
2214 | do { |
2215 | for (vp = *vpp; vp; vp = vp->next) { |
2216 | if ((vp->flags & mask) == on) { |
2217 | if (ep == stackstrend()) |
2218 | ep = growstackstr(); |
2219 | *ep++ = (char*)vp->var_text; |
2220 | } |
2221 | } |
2222 | } while (++vpp < vartab + VTABSIZE); |
2223 | if (ep == stackstrend()) |
2224 | ep = growstackstr(); |
2225 | if (end) |
2226 | *end = ep; |
2227 | *ep++ = NULL; |
2228 | return grabstackstr(ep); |
2229 | } |
2230 | |
2231 | |
2232 | /* ============ Path search helper |
2233 | * |
2234 | * The variable path (passed by reference) should be set to the start |
2235 | * of the path before the first call; path_advance will update |
2236 | * this value as it proceeds. Successive calls to path_advance will return |
2237 | * the possible path expansions in sequence. If an option (indicated by |
2238 | * a percent sign) appears in the path entry then the global variable |
2239 | * pathopt will be set to point to it; otherwise pathopt will be set to |
2240 | * NULL. |
2241 | */ |
2242 | static const char *pathopt; /* set by path_advance */ |
2243 | |
2244 | static char * |
2245 | path_advance(const char **path, const char *name) |
2246 | { |
2247 | const char *p; |
2248 | char *q; |
2249 | const char *start; |
2250 | size_t len; |
2251 | |
2252 | if (*path == NULL) |
2253 | return NULL; |
2254 | start = *path; |
2255 | for (p = start; *p && *p != ':' && *p != '%'; p++) |
2256 | continue; |
2257 | len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */ |
2258 | while (stackblocksize() < len) |
2259 | growstackblock(); |
2260 | q = stackblock(); |
2261 | if (p != start) { |
2262 | memcpy(q, start, p - start); |
2263 | q += p - start; |
2264 | *q++ = '/'; |
2265 | } |
2266 | strcpy(q, name); |
2267 | pathopt = NULL; |
2268 | if (*p == '%') { |
2269 | pathopt = ++p; |
2270 | while (*p && *p != ':') |
2271 | p++; |
2272 | } |
2273 | if (*p == ':') |
2274 | *path = p + 1; |
2275 | else |
2276 | *path = NULL; |
2277 | return stalloc(len); |
2278 | } |
2279 | |
2280 | |
2281 | /* ============ Prompt */ |
2282 | |
2283 | static smallint doprompt; /* if set, prompt the user */ |
2284 | static smallint needprompt; /* true if interactive and at start of line */ |
2285 | |
2286 | #if ENABLE_FEATURE_EDITING |
2287 | static line_input_t *line_input_state; |
2288 | static const char *cmdedit_prompt; |
2289 | static void |
2290 | putprompt(const char *s) |
2291 | { |
2292 | if (ENABLE_ASH_EXPAND_PRMT) { |
2293 | free((char*)cmdedit_prompt); |
2294 | cmdedit_prompt = ckstrdup(s); |
2295 | return; |
2296 | } |
2297 | cmdedit_prompt = s; |
2298 | } |
2299 | #else |
2300 | static void |
2301 | putprompt(const char *s) |
2302 | { |
2303 | out2str(s); |
2304 | } |
2305 | #endif |
2306 | |
2307 | #if ENABLE_ASH_EXPAND_PRMT |
2308 | /* expandstr() needs parsing machinery, so it is far away ahead... */ |
2309 | static const char *expandstr(const char *ps); |
2310 | #else |
2311 | #define expandstr(s) s |
2312 | #endif |
2313 | |
2314 | static void |
2315 | setprompt(int whichprompt) |
2316 | { |
2317 | const char *prompt; |
2318 | #if ENABLE_ASH_EXPAND_PRMT |
2319 | struct stackmark smark; |
2320 | #endif |
2321 | |
2322 | needprompt = 0; |
2323 | |
2324 | switch (whichprompt) { |
2325 | case 1: |
2326 | prompt = ps1val(); |
2327 | break; |
2328 | case 2: |
2329 | prompt = ps2val(); |
2330 | break; |
2331 | default: /* 0 */ |
2332 | prompt = nullstr; |
2333 | } |
2334 | #if ENABLE_ASH_EXPAND_PRMT |
2335 | setstackmark(&smark); |
2336 | stalloc(stackblocksize()); |
2337 | #endif |
2338 | putprompt(expandstr(prompt)); |
2339 | #if ENABLE_ASH_EXPAND_PRMT |
2340 | popstackmark(&smark); |
2341 | #endif |
2342 | } |
2343 | |
2344 | |
2345 | /* ============ The cd and pwd commands */ |
2346 | |
2347 | #define CD_PHYSICAL 1 |
2348 | #define CD_PRINT 2 |
2349 | |
2350 | static int |
2351 | cdopt(void) |
2352 | { |
2353 | int flags = 0; |
2354 | int i, j; |
2355 | |
2356 | j = 'L'; |
2357 | while ((i = nextopt("LP")) != '\0') { |
2358 | if (i != j) { |
2359 | flags ^= CD_PHYSICAL; |
2360 | j = i; |
2361 | } |
2362 | } |
2363 | |
2364 | return flags; |
2365 | } |
2366 | |
2367 | /* |
2368 | * Update curdir (the name of the current directory) in response to a |
2369 | * cd command. |
2370 | */ |
2371 | static const char * |
2372 | updatepwd(const char *dir) |
2373 | { |
2374 | char *new; |
2375 | char *p; |
2376 | char *cdcomppath; |
2377 | const char *lim; |
2378 | |
2379 | cdcomppath = ststrdup(dir); |
2380 | STARTSTACKSTR(new); |
2381 | if (*dir != '/') { |
2382 | if (curdir == nullstr) |
2383 | return 0; |
2384 | new = stack_putstr(curdir, new); |
2385 | } |
2386 | new = makestrspace(strlen(dir) + 2, new); |
2387 | lim = (char *)stackblock() + 1; |
2388 | if (*dir != '/') { |
2389 | if (new[-1] != '/') |
2390 | USTPUTC('/', new); |
2391 | if (new > lim && *lim == '/') |
2392 | lim++; |
2393 | } else { |
2394 | USTPUTC('/', new); |
2395 | cdcomppath++; |
2396 | if (dir[1] == '/' && dir[2] != '/') { |
2397 | USTPUTC('/', new); |
2398 | cdcomppath++; |
2399 | lim++; |
2400 | } |
2401 | } |
2402 | p = strtok(cdcomppath, "/"); |
2403 | while (p) { |
2404 | switch (*p) { |
2405 | case '.': |
2406 | if (p[1] == '.' && p[2] == '\0') { |
2407 | while (new > lim) { |
2408 | STUNPUTC(new); |
2409 | if (new[-1] == '/') |
2410 | break; |
2411 | } |
2412 | break; |
2413 | } |
2414 | if (p[1] == '\0') |
2415 | break; |
2416 | /* fall through */ |
2417 | default: |
2418 | new = stack_putstr(p, new); |
2419 | USTPUTC('/', new); |
2420 | } |
2421 | p = strtok(0, "/"); |
2422 | } |
2423 | if (new > lim) |
2424 | STUNPUTC(new); |
2425 | *new = 0; |
2426 | return stackblock(); |
2427 | } |
2428 | |
2429 | /* |
2430 | * Find out what the current directory is. If we already know the current |
2431 | * directory, this routine returns immediately. |
2432 | */ |
2433 | static char * |
2434 | getpwd(void) |
2435 | { |
2436 | char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */ |
2437 | return dir ? dir : nullstr; |
2438 | } |
2439 | |
2440 | static void |
2441 | setpwd(const char *val, int setold) |
2442 | { |
2443 | char *oldcur, *dir; |
2444 | |
2445 | oldcur = dir = curdir; |
2446 | |
2447 | if (setold) { |
2448 | setvar("OLDPWD", oldcur, VEXPORT); |
2449 | } |
2450 | INT_OFF; |
2451 | if (physdir != nullstr) { |
2452 | if (physdir != oldcur) |
2453 | free(physdir); |
2454 | physdir = nullstr; |
2455 | } |
2456 | if (oldcur == val || !val) { |
2457 | char *s = getpwd(); |
2458 | physdir = s; |
2459 | if (!val) |
2460 | dir = s; |
2461 | } else |
2462 | dir = ckstrdup(val); |
2463 | if (oldcur != dir && oldcur != nullstr) { |
2464 | free(oldcur); |
2465 | } |
2466 | curdir = dir; |
2467 | INT_ON; |
2468 | setvar("PWD", dir, VEXPORT); |
2469 | } |
2470 | |
2471 | static void hashcd(void); |
2472 | |
2473 | /* |
2474 | * Actually do the chdir. We also call hashcd to let the routines in exec.c |
2475 | * know that the current directory has changed. |
2476 | */ |
2477 | static int |
2478 | docd(const char *dest, int flags) |
2479 | { |
2480 | const char *dir = NULL; |
2481 | int err; |
2482 | |
2483 | TRACE(("docd(\"%s\", %d) called\n", dest, flags)); |
2484 | |
2485 | INT_OFF; |
2486 | if (!(flags & CD_PHYSICAL)) { |
2487 | dir = updatepwd(dest); |
2488 | if (dir) |
2489 | dest = dir; |
2490 | } |
2491 | err = chdir(dest); |
2492 | if (err) |
2493 | goto out; |
2494 | setpwd(dir, 1); |
2495 | hashcd(); |
2496 | out: |
2497 | INT_ON; |
2498 | return err; |
2499 | } |
2500 | |
2501 | static int FAST_FUNC |
2502 | cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
2503 | { |
2504 | const char *dest; |
2505 | const char *path; |
2506 | const char *p; |
2507 | char c; |
2508 | struct stat statb; |
2509 | int flags; |
2510 | |
2511 | flags = cdopt(); |
2512 | dest = *argptr; |
2513 | if (!dest) |
2514 | dest = bltinlookup("HOME"); |
2515 | else if (LONE_DASH(dest)) { |
2516 | dest = bltinlookup("OLDPWD"); |
2517 | flags |= CD_PRINT; |
2518 | } |
2519 | if (!dest) |
2520 | dest = nullstr; |
2521 | if (*dest == '/') |
2522 | goto step7; |
2523 | if (*dest == '.') { |
2524 | c = dest[1]; |
2525 | dotdot: |
2526 | switch (c) { |
2527 | case '\0': |
2528 | case '/': |
2529 | goto step6; |
2530 | case '.': |
2531 | c = dest[2]; |
2532 | if (c != '.') |
2533 | goto dotdot; |
2534 | } |
2535 | } |
2536 | if (!*dest) |
2537 | dest = "."; |
2538 | path = bltinlookup("CDPATH"); |
2539 | if (!path) { |
2540 | step6: |
2541 | step7: |
2542 | p = dest; |
2543 | goto docd; |
2544 | } |
2545 | do { |
2546 | c = *path; |
2547 | p = path_advance(&path, dest); |
2548 | if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) { |
2549 | if (c && c != ':') |
2550 | flags |= CD_PRINT; |
2551 | docd: |
2552 | if (!docd(p, flags)) |
2553 | goto out; |
2554 | break; |
2555 | } |
2556 | } while (path); |
2557 | ash_msg_and_raise_error("can't cd to %s", dest); |
2558 | /* NOTREACHED */ |
2559 | out: |
2560 | if (flags & CD_PRINT) |
2561 | out1fmt("%s\n", curdir); |
2562 | return 0; |
2563 | } |
2564 | |
2565 | static int FAST_FUNC |
2566 | pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
2567 | { |
2568 | int flags; |
2569 | const char *dir = curdir; |
2570 | |
2571 | flags = cdopt(); |
2572 | if (flags) { |
2573 | if (physdir == nullstr) |
2574 | setpwd(dir, 0); |
2575 | dir = physdir; |
2576 | } |
2577 | out1fmt("%s\n", dir); |
2578 | return 0; |
2579 | } |
2580 | |
2581 | |
2582 | /* ============ ... */ |
2583 | |
2584 | |
2585 | #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024) |
2586 | |
2587 | /* Syntax classes */ |
2588 | #define CWORD 0 /* character is nothing special */ |
2589 | #define CNL 1 /* newline character */ |
2590 | #define CBACK 2 /* a backslash character */ |
2591 | #define CSQUOTE 3 /* single quote */ |
2592 | #define CDQUOTE 4 /* double quote */ |
2593 | #define CENDQUOTE 5 /* a terminating quote */ |
2594 | #define CBQUOTE 6 /* backwards single quote */ |
2595 | #define CVAR 7 /* a dollar sign */ |
2596 | #define CENDVAR 8 /* a '}' character */ |
2597 | #define CLP 9 /* a left paren in arithmetic */ |
2598 | #define CRP 10 /* a right paren in arithmetic */ |
2599 | #define CENDFILE 11 /* end of file */ |
2600 | #define CCTL 12 /* like CWORD, except it must be escaped */ |
2601 | #define CSPCL 13 /* these terminate a word */ |
2602 | #define CIGN 14 /* character should be ignored */ |
2603 | |
2604 | #define PEOF 256 |
2605 | #if ENABLE_ASH_ALIAS |
2606 | # define PEOA 257 |
2607 | #endif |
2608 | |
2609 | #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE |
2610 | |
2611 | #if ENABLE_SH_MATH_SUPPORT |
2612 | # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12)) |
2613 | #else |
2614 | # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8)) |
2615 | #endif |
2616 | static const uint16_t S_I_T[] = { |
2617 | #if ENABLE_ASH_ALIAS |
2618 | SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */ |
2619 | #endif |
2620 | SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */ |
2621 | SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */ |
2622 | SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */ |
2623 | SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */ |
2624 | SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */ |
2625 | SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */ |
2626 | SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */ |
2627 | SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */ |
2628 | SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */ |
2629 | SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */ |
2630 | SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */ |
2631 | #if !USE_SIT_FUNCTION |
2632 | SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */ |
2633 | SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */ |
2634 | SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */ |
2635 | #endif |
2636 | #undef SIT_ITEM |
2637 | }; |
2638 | /* Constants below must match table above */ |
2639 | enum { |
2640 | #if ENABLE_ASH_ALIAS |
2641 | CSPCL_CIGN_CIGN_CIGN , /* 0 */ |
2642 | #endif |
2643 | CSPCL_CWORD_CWORD_CWORD , /* 1 */ |
2644 | CNL_CNL_CNL_CNL , /* 2 */ |
2645 | CWORD_CCTL_CCTL_CWORD , /* 3 */ |
2646 | CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */ |
2647 | CVAR_CVAR_CWORD_CVAR , /* 5 */ |
2648 | CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */ |
2649 | CSPCL_CWORD_CWORD_CLP , /* 7 */ |
2650 | CSPCL_CWORD_CWORD_CRP , /* 8 */ |
2651 | CBACK_CBACK_CCTL_CBACK , /* 9 */ |
2652 | CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */ |
2653 | CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */ |
2654 | CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */ |
2655 | CWORD_CWORD_CWORD_CWORD , /* 13 */ |
2656 | CCTL_CCTL_CCTL_CCTL , /* 14 */ |
2657 | }; |
2658 | |
2659 | /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF, |
2660 | * caller must ensure proper cast on it if c is *char_ptr! |
2661 | */ |
2662 | /* Values for syntax param */ |
2663 | #define BASESYNTAX 0 /* not in quotes */ |
2664 | #define DQSYNTAX 1 /* in double quotes */ |
2665 | #define SQSYNTAX 2 /* in single quotes */ |
2666 | #define ARISYNTAX 3 /* in arithmetic */ |
2667 | #define PSSYNTAX 4 /* prompt. never passed to SIT() */ |
2668 | |
2669 | #if USE_SIT_FUNCTION |
2670 | |
2671 | static int |
2672 | SIT(int c, int syntax) |
2673 | { |
2674 | static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~"; |
2675 | # if ENABLE_ASH_ALIAS |
2676 | static const uint8_t syntax_index_table[] ALIGN1 = { |
2677 | 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */ |
2678 | 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */ |
2679 | 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */ |
2680 | 11, 3 /* "}~" */ |
2681 | }; |
2682 | # else |
2683 | static const uint8_t syntax_index_table[] ALIGN1 = { |
2684 | 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */ |
2685 | 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */ |
2686 | 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */ |
2687 | 10, 2 /* "}~" */ |
2688 | }; |
2689 | # endif |
2690 | const char *s; |
2691 | int indx; |
2692 | |
2693 | if (c == PEOF) |
2694 | return CENDFILE; |
2695 | # if ENABLE_ASH_ALIAS |
2696 | if (c == PEOA) |
2697 | indx = 0; |
2698 | else |
2699 | # endif |
2700 | { |
2701 | /* Cast is purely for paranoia here, |
2702 | * just in case someone passed signed char to us */ |
2703 | if ((unsigned char)c >= CTL_FIRST |
2704 | && (unsigned char)c <= CTL_LAST |
2705 | ) { |
2706 | return CCTL; |
2707 | } |
2708 | s = strchrnul(spec_symbls, c); |
2709 | if (*s == '\0') |
2710 | return CWORD; |
2711 | indx = syntax_index_table[s - spec_symbls]; |
2712 | } |
2713 | return (S_I_T[indx] >> (syntax*4)) & 0xf; |
2714 | } |
2715 | |
2716 | #else /* !USE_SIT_FUNCTION */ |
2717 | |
2718 | static const uint8_t syntax_index_table[] = { |
2719 | /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */ |
2720 | /* 0 */ CWORD_CWORD_CWORD_CWORD, |
2721 | /* 1 */ CWORD_CWORD_CWORD_CWORD, |
2722 | /* 2 */ CWORD_CWORD_CWORD_CWORD, |
2723 | /* 3 */ CWORD_CWORD_CWORD_CWORD, |
2724 | /* 4 */ CWORD_CWORD_CWORD_CWORD, |
2725 | /* 5 */ CWORD_CWORD_CWORD_CWORD, |
2726 | /* 6 */ CWORD_CWORD_CWORD_CWORD, |
2727 | /* 7 */ CWORD_CWORD_CWORD_CWORD, |
2728 | /* 8 */ CWORD_CWORD_CWORD_CWORD, |
2729 | /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD, |
2730 | /* 10 "\n" */ CNL_CNL_CNL_CNL, |
2731 | /* 11 */ CWORD_CWORD_CWORD_CWORD, |
2732 | /* 12 */ CWORD_CWORD_CWORD_CWORD, |
2733 | /* 13 */ CWORD_CWORD_CWORD_CWORD, |
2734 | /* 14 */ CWORD_CWORD_CWORD_CWORD, |
2735 | /* 15 */ CWORD_CWORD_CWORD_CWORD, |
2736 | /* 16 */ CWORD_CWORD_CWORD_CWORD, |
2737 | /* 17 */ CWORD_CWORD_CWORD_CWORD, |
2738 | /* 18 */ CWORD_CWORD_CWORD_CWORD, |
2739 | /* 19 */ CWORD_CWORD_CWORD_CWORD, |
2740 | /* 20 */ CWORD_CWORD_CWORD_CWORD, |
2741 | /* 21 */ CWORD_CWORD_CWORD_CWORD, |
2742 | /* 22 */ CWORD_CWORD_CWORD_CWORD, |
2743 | /* 23 */ CWORD_CWORD_CWORD_CWORD, |
2744 | /* 24 */ CWORD_CWORD_CWORD_CWORD, |
2745 | /* 25 */ CWORD_CWORD_CWORD_CWORD, |
2746 | /* 26 */ CWORD_CWORD_CWORD_CWORD, |
2747 | /* 27 */ CWORD_CWORD_CWORD_CWORD, |
2748 | /* 28 */ CWORD_CWORD_CWORD_CWORD, |
2749 | /* 29 */ CWORD_CWORD_CWORD_CWORD, |
2750 | /* 30 */ CWORD_CWORD_CWORD_CWORD, |
2751 | /* 31 */ CWORD_CWORD_CWORD_CWORD, |
2752 | /* 32 " " */ CSPCL_CWORD_CWORD_CWORD, |
2753 | /* 33 "!" */ CWORD_CCTL_CCTL_CWORD, |
2754 | /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD, |
2755 | /* 35 "#" */ CWORD_CWORD_CWORD_CWORD, |
2756 | /* 36 "$" */ CVAR_CVAR_CWORD_CVAR, |
2757 | /* 37 "%" */ CWORD_CWORD_CWORD_CWORD, |
2758 | /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD, |
2759 | /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD, |
2760 | /* 40 "(" */ CSPCL_CWORD_CWORD_CLP, |
2761 | /* 41 ")" */ CSPCL_CWORD_CWORD_CRP, |
2762 | /* 42 "*" */ CWORD_CCTL_CCTL_CWORD, |
2763 | /* 43 "+" */ CWORD_CWORD_CWORD_CWORD, |
2764 | /* 44 "," */ CWORD_CWORD_CWORD_CWORD, |
2765 | /* 45 "-" */ CWORD_CCTL_CCTL_CWORD, |
2766 | /* 46 "." */ CWORD_CWORD_CWORD_CWORD, |
2767 | /* 47 "/" */ CWORD_CCTL_CCTL_CWORD, |
2768 | /* 48 "0" */ CWORD_CWORD_CWORD_CWORD, |
2769 | /* 49 "1" */ CWORD_CWORD_CWORD_CWORD, |
2770 | /* 50 "2" */ CWORD_CWORD_CWORD_CWORD, |
2771 | /* 51 "3" */ CWORD_CWORD_CWORD_CWORD, |
2772 | /* 52 "4" */ CWORD_CWORD_CWORD_CWORD, |
2773 | /* 53 "5" */ CWORD_CWORD_CWORD_CWORD, |
2774 | /* 54 "6" */ CWORD_CWORD_CWORD_CWORD, |
2775 | /* 55 "7" */ CWORD_CWORD_CWORD_CWORD, |
2776 | /* 56 "8" */ CWORD_CWORD_CWORD_CWORD, |
2777 | /* 57 "9" */ CWORD_CWORD_CWORD_CWORD, |
2778 | /* 58 ":" */ CWORD_CCTL_CCTL_CWORD, |
2779 | /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD, |
2780 | /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD, |
2781 | /* 61 "=" */ CWORD_CCTL_CCTL_CWORD, |
2782 | /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD, |
2783 | /* 63 "?" */ CWORD_CCTL_CCTL_CWORD, |
2784 | /* 64 "@" */ CWORD_CWORD_CWORD_CWORD, |
2785 | /* 65 "A" */ CWORD_CWORD_CWORD_CWORD, |
2786 | /* 66 "B" */ CWORD_CWORD_CWORD_CWORD, |
2787 | /* 67 "C" */ CWORD_CWORD_CWORD_CWORD, |
2788 | /* 68 "D" */ CWORD_CWORD_CWORD_CWORD, |
2789 | /* 69 "E" */ CWORD_CWORD_CWORD_CWORD, |
2790 | /* 70 "F" */ CWORD_CWORD_CWORD_CWORD, |
2791 | /* 71 "G" */ CWORD_CWORD_CWORD_CWORD, |
2792 | /* 72 "H" */ CWORD_CWORD_CWORD_CWORD, |
2793 | /* 73 "I" */ CWORD_CWORD_CWORD_CWORD, |
2794 | /* 74 "J" */ CWORD_CWORD_CWORD_CWORD, |
2795 | /* 75 "K" */ CWORD_CWORD_CWORD_CWORD, |
2796 | /* 76 "L" */ CWORD_CWORD_CWORD_CWORD, |
2797 | /* 77 "M" */ CWORD_CWORD_CWORD_CWORD, |
2798 | /* 78 "N" */ CWORD_CWORD_CWORD_CWORD, |
2799 | /* 79 "O" */ CWORD_CWORD_CWORD_CWORD, |
2800 | /* 80 "P" */ CWORD_CWORD_CWORD_CWORD, |
2801 | /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD, |
2802 | /* 82 "R" */ CWORD_CWORD_CWORD_CWORD, |
2803 | /* 83 "S" */ CWORD_CWORD_CWORD_CWORD, |
2804 | /* 84 "T" */ CWORD_CWORD_CWORD_CWORD, |
2805 | /* 85 "U" */ CWORD_CWORD_CWORD_CWORD, |
2806 | /* 86 "V" */ CWORD_CWORD_CWORD_CWORD, |
2807 | /* 87 "W" */ CWORD_CWORD_CWORD_CWORD, |
2808 | /* 88 "X" */ CWORD_CWORD_CWORD_CWORD, |
2809 | /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD, |
2810 | /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD, |
2811 | /* 91 "[" */ CWORD_CCTL_CCTL_CWORD, |
2812 | /* 92 "\" */ CBACK_CBACK_CCTL_CBACK, |
2813 | /* 93 "]" */ CWORD_CCTL_CCTL_CWORD, |
2814 | /* 94 "^" */ CWORD_CWORD_CWORD_CWORD, |
2815 | /* 95 "_" */ CWORD_CWORD_CWORD_CWORD, |
2816 | /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE, |
2817 | /* 97 "a" */ CWORD_CWORD_CWORD_CWORD, |
2818 | /* 98 "b" */ CWORD_CWORD_CWORD_CWORD, |
2819 | /* 99 "c" */ CWORD_CWORD_CWORD_CWORD, |
2820 | /* 100 "d" */ CWORD_CWORD_CWORD_CWORD, |
2821 | /* 101 "e" */ CWORD_CWORD_CWORD_CWORD, |
2822 | /* 102 "f" */ CWORD_CWORD_CWORD_CWORD, |
2823 | /* 103 "g" */ CWORD_CWORD_CWORD_CWORD, |
2824 | /* 104 "h" */ CWORD_CWORD_CWORD_CWORD, |
2825 | /* 105 "i" */ CWORD_CWORD_CWORD_CWORD, |
2826 | /* 106 "j" */ CWORD_CWORD_CWORD_CWORD, |
2827 | /* 107 "k" */ CWORD_CWORD_CWORD_CWORD, |
2828 | /* 108 "l" */ CWORD_CWORD_CWORD_CWORD, |
2829 | /* 109 "m" */ CWORD_CWORD_CWORD_CWORD, |
2830 | /* 110 "n" */ CWORD_CWORD_CWORD_CWORD, |
2831 | /* 111 "o" */ CWORD_CWORD_CWORD_CWORD, |
2832 | /* 112 "p" */ CWORD_CWORD_CWORD_CWORD, |
2833 | /* 113 "q" */ CWORD_CWORD_CWORD_CWORD, |
2834 | /* 114 "r" */ CWORD_CWORD_CWORD_CWORD, |
2835 | /* 115 "s" */ CWORD_CWORD_CWORD_CWORD, |
2836 | /* 116 "t" */ CWORD_CWORD_CWORD_CWORD, |
2837 | /* 117 "u" */ CWORD_CWORD_CWORD_CWORD, |
2838 | /* 118 "v" */ CWORD_CWORD_CWORD_CWORD, |
2839 | /* 119 "w" */ CWORD_CWORD_CWORD_CWORD, |
2840 | /* 120 "x" */ CWORD_CWORD_CWORD_CWORD, |
2841 | /* 121 "y" */ CWORD_CWORD_CWORD_CWORD, |
2842 | /* 122 "z" */ CWORD_CWORD_CWORD_CWORD, |
2843 | /* 123 "{" */ CWORD_CWORD_CWORD_CWORD, |
2844 | /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD, |
2845 | /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR, |
2846 | /* 126 "~" */ CWORD_CCTL_CCTL_CWORD, |
2847 | /* 127 del */ CWORD_CWORD_CWORD_CWORD, |
2848 | /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD, |
2849 | /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL, |
2850 | /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL, |
2851 | /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL, |
2852 | /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL, |
2853 | /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL, |
2854 | /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL, |
2855 | /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL, |
2856 | /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL, |
2857 | /* 137 */ CWORD_CWORD_CWORD_CWORD, |
2858 | /* 138 */ CWORD_CWORD_CWORD_CWORD, |
2859 | /* 139 */ CWORD_CWORD_CWORD_CWORD, |
2860 | /* 140 */ CWORD_CWORD_CWORD_CWORD, |
2861 | /* 141 */ CWORD_CWORD_CWORD_CWORD, |
2862 | /* 142 */ CWORD_CWORD_CWORD_CWORD, |
2863 | /* 143 */ CWORD_CWORD_CWORD_CWORD, |
2864 | /* 144 */ CWORD_CWORD_CWORD_CWORD, |
2865 | /* 145 */ CWORD_CWORD_CWORD_CWORD, |
2866 | /* 146 */ CWORD_CWORD_CWORD_CWORD, |
2867 | /* 147 */ CWORD_CWORD_CWORD_CWORD, |
2868 | /* 148 */ CWORD_CWORD_CWORD_CWORD, |
2869 | /* 149 */ CWORD_CWORD_CWORD_CWORD, |
2870 | /* 150 */ CWORD_CWORD_CWORD_CWORD, |
2871 | /* 151 */ CWORD_CWORD_CWORD_CWORD, |
2872 | /* 152 */ CWORD_CWORD_CWORD_CWORD, |
2873 | /* 153 */ CWORD_CWORD_CWORD_CWORD, |
2874 | /* 154 */ CWORD_CWORD_CWORD_CWORD, |
2875 | /* 155 */ CWORD_CWORD_CWORD_CWORD, |
2876 | /* 156 */ CWORD_CWORD_CWORD_CWORD, |
2877 | /* 157 */ CWORD_CWORD_CWORD_CWORD, |
2878 | /* 158 */ CWORD_CWORD_CWORD_CWORD, |
2879 | /* 159 */ CWORD_CWORD_CWORD_CWORD, |
2880 | /* 160 */ CWORD_CWORD_CWORD_CWORD, |
2881 | /* 161 */ CWORD_CWORD_CWORD_CWORD, |
2882 | /* 162 */ CWORD_CWORD_CWORD_CWORD, |
2883 | /* 163 */ CWORD_CWORD_CWORD_CWORD, |
2884 | /* 164 */ CWORD_CWORD_CWORD_CWORD, |
2885 | /* 165 */ CWORD_CWORD_CWORD_CWORD, |
2886 | /* 166 */ CWORD_CWORD_CWORD_CWORD, |
2887 | /* 167 */ CWORD_CWORD_CWORD_CWORD, |
2888 | /* 168 */ CWORD_CWORD_CWORD_CWORD, |
2889 | /* 169 */ CWORD_CWORD_CWORD_CWORD, |
2890 | /* 170 */ CWORD_CWORD_CWORD_CWORD, |
2891 | /* 171 */ CWORD_CWORD_CWORD_CWORD, |
2892 | /* 172 */ CWORD_CWORD_CWORD_CWORD, |
2893 | /* 173 */ CWORD_CWORD_CWORD_CWORD, |
2894 | /* 174 */ CWORD_CWORD_CWORD_CWORD, |
2895 | /* 175 */ CWORD_CWORD_CWORD_CWORD, |
2896 | /* 176 */ CWORD_CWORD_CWORD_CWORD, |
2897 | /* 177 */ CWORD_CWORD_CWORD_CWORD, |
2898 | /* 178 */ CWORD_CWORD_CWORD_CWORD, |
2899 | /* 179 */ CWORD_CWORD_CWORD_CWORD, |
2900 | /* 180 */ CWORD_CWORD_CWORD_CWORD, |
2901 | /* 181 */ CWORD_CWORD_CWORD_CWORD, |
2902 | /* 182 */ CWORD_CWORD_CWORD_CWORD, |
2903 | /* 183 */ CWORD_CWORD_CWORD_CWORD, |
2904 | /* 184 */ CWORD_CWORD_CWORD_CWORD, |
2905 | /* 185 */ CWORD_CWORD_CWORD_CWORD, |
2906 | /* 186 */ CWORD_CWORD_CWORD_CWORD, |
2907 | /* 187 */ CWORD_CWORD_CWORD_CWORD, |
2908 | /* 188 */ CWORD_CWORD_CWORD_CWORD, |
2909 | /* 189 */ CWORD_CWORD_CWORD_CWORD, |
2910 | /* 190 */ CWORD_CWORD_CWORD_CWORD, |
2911 | /* 191 */ CWORD_CWORD_CWORD_CWORD, |
2912 | /* 192 */ CWORD_CWORD_CWORD_CWORD, |
2913 | /* 193 */ CWORD_CWORD_CWORD_CWORD, |
2914 | /* 194 */ CWORD_CWORD_CWORD_CWORD, |
2915 | /* 195 */ CWORD_CWORD_CWORD_CWORD, |
2916 | /* 196 */ CWORD_CWORD_CWORD_CWORD, |
2917 | /* 197 */ CWORD_CWORD_CWORD_CWORD, |
2918 | /* 198 */ CWORD_CWORD_CWORD_CWORD, |
2919 | /* 199 */ CWORD_CWORD_CWORD_CWORD, |
2920 | /* 200 */ CWORD_CWORD_CWORD_CWORD, |
2921 | /* 201 */ CWORD_CWORD_CWORD_CWORD, |
2922 | /* 202 */ CWORD_CWORD_CWORD_CWORD, |
2923 | /* 203 */ CWORD_CWORD_CWORD_CWORD, |
2924 | /* 204 */ CWORD_CWORD_CWORD_CWORD, |
2925 | /* 205 */ CWORD_CWORD_CWORD_CWORD, |
2926 | /* 206 */ CWORD_CWORD_CWORD_CWORD, |
2927 | /* 207 */ CWORD_CWORD_CWORD_CWORD, |
2928 | /* 208 */ CWORD_CWORD_CWORD_CWORD, |
2929 | /* 209 */ CWORD_CWORD_CWORD_CWORD, |
2930 | /* 210 */ CWORD_CWORD_CWORD_CWORD, |
2931 | /* 211 */ CWORD_CWORD_CWORD_CWORD, |
2932 | /* 212 */ CWORD_CWORD_CWORD_CWORD, |
2933 | /* 213 */ CWORD_CWORD_CWORD_CWORD, |
2934 | /* 214 */ CWORD_CWORD_CWORD_CWORD, |
2935 | /* 215 */ CWORD_CWORD_CWORD_CWORD, |
2936 | /* 216 */ CWORD_CWORD_CWORD_CWORD, |
2937 | /* 217 */ CWORD_CWORD_CWORD_CWORD, |
2938 | /* 218 */ CWORD_CWORD_CWORD_CWORD, |
2939 | /* 219 */ CWORD_CWORD_CWORD_CWORD, |
2940 | /* 220 */ CWORD_CWORD_CWORD_CWORD, |
2941 | /* 221 */ CWORD_CWORD_CWORD_CWORD, |
2942 | /* 222 */ CWORD_CWORD_CWORD_CWORD, |
2943 | /* 223 */ CWORD_CWORD_CWORD_CWORD, |
2944 | /* 224 */ CWORD_CWORD_CWORD_CWORD, |
2945 | /* 225 */ CWORD_CWORD_CWORD_CWORD, |
2946 | /* 226 */ CWORD_CWORD_CWORD_CWORD, |
2947 | /* 227 */ CWORD_CWORD_CWORD_CWORD, |
2948 | /* 228 */ CWORD_CWORD_CWORD_CWORD, |
2949 | /* 229 */ CWORD_CWORD_CWORD_CWORD, |
2950 | /* 230 */ CWORD_CWORD_CWORD_CWORD, |
2951 | /* 231 */ CWORD_CWORD_CWORD_CWORD, |
2952 | /* 232 */ CWORD_CWORD_CWORD_CWORD, |
2953 | /* 233 */ CWORD_CWORD_CWORD_CWORD, |
2954 | /* 234 */ CWORD_CWORD_CWORD_CWORD, |
2955 | /* 235 */ CWORD_CWORD_CWORD_CWORD, |
2956 | /* 236 */ CWORD_CWORD_CWORD_CWORD, |
2957 | /* 237 */ CWORD_CWORD_CWORD_CWORD, |
2958 | /* 238 */ CWORD_CWORD_CWORD_CWORD, |
2959 | /* 239 */ CWORD_CWORD_CWORD_CWORD, |
2960 | /* 230 */ CWORD_CWORD_CWORD_CWORD, |
2961 | /* 241 */ CWORD_CWORD_CWORD_CWORD, |
2962 | /* 242 */ CWORD_CWORD_CWORD_CWORD, |
2963 | /* 243 */ CWORD_CWORD_CWORD_CWORD, |
2964 | /* 244 */ CWORD_CWORD_CWORD_CWORD, |
2965 | /* 245 */ CWORD_CWORD_CWORD_CWORD, |
2966 | /* 246 */ CWORD_CWORD_CWORD_CWORD, |
2967 | /* 247 */ CWORD_CWORD_CWORD_CWORD, |
2968 | /* 248 */ CWORD_CWORD_CWORD_CWORD, |
2969 | /* 249 */ CWORD_CWORD_CWORD_CWORD, |
2970 | /* 250 */ CWORD_CWORD_CWORD_CWORD, |
2971 | /* 251 */ CWORD_CWORD_CWORD_CWORD, |
2972 | /* 252 */ CWORD_CWORD_CWORD_CWORD, |
2973 | /* 253 */ CWORD_CWORD_CWORD_CWORD, |
2974 | /* 254 */ CWORD_CWORD_CWORD_CWORD, |
2975 | /* 255 */ CWORD_CWORD_CWORD_CWORD, |
2976 | /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE, |
2977 | # if ENABLE_ASH_ALIAS |
2978 | /* PEOA */ CSPCL_CIGN_CIGN_CIGN, |
2979 | # endif |
2980 | }; |
2981 | |
2982 | # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf) |
2983 | |
2984 | #endif /* !USE_SIT_FUNCTION */ |
2985 | |
2986 | |
2987 | /* ============ Alias handling */ |
2988 | |
2989 | #if ENABLE_ASH_ALIAS |
2990 | |
2991 | #define ALIASINUSE 1 |
2992 | #define ALIASDEAD 2 |
2993 | |
2994 | struct alias { |
2995 | struct alias *next; |
2996 | char *name; |
2997 | char *val; |
2998 | int flag; |
2999 | }; |
3000 | |
3001 | |
3002 | static struct alias **atab; // [ATABSIZE]; |
3003 | #define INIT_G_alias() do { \ |
3004 | atab = xzalloc(ATABSIZE * sizeof(atab[0])); \ |
3005 | } while (0) |
3006 | |
3007 | |
3008 | static struct alias ** |
3009 | __lookupalias(const char *name) { |
3010 | unsigned int hashval; |
3011 | struct alias **app; |
3012 | const char *p; |
3013 | unsigned int ch; |
3014 | |
3015 | p = name; |
3016 | |
3017 | ch = (unsigned char)*p; |
3018 | hashval = ch << 4; |
3019 | while (ch) { |
3020 | hashval += ch; |
3021 | ch = (unsigned char)*++p; |
3022 | } |
3023 | app = &atab[hashval % ATABSIZE]; |
3024 | |
3025 | for (; *app; app = &(*app)->next) { |
3026 | if (strcmp(name, (*app)->name) == 0) { |
3027 | break; |
3028 | } |
3029 | } |
3030 | |
3031 | return app; |
3032 | } |
3033 | |
3034 | static struct alias * |
3035 | lookupalias(const char *name, int check) |
3036 | { |
3037 | struct alias *ap = *__lookupalias(name); |
3038 | |
3039 | if (check && ap && (ap->flag & ALIASINUSE)) |
3040 | return NULL; |
3041 | return ap; |
3042 | } |
3043 | |
3044 | static struct alias * |
3045 | freealias(struct alias *ap) |
3046 | { |
3047 | struct alias *next; |
3048 | |
3049 | if (ap->flag & ALIASINUSE) { |
3050 | ap->flag |= ALIASDEAD; |
3051 | return ap; |
3052 | } |
3053 | |
3054 | next = ap->next; |
3055 | free(ap->name); |
3056 | free(ap->val); |
3057 | free(ap); |
3058 | return next; |
3059 | } |
3060 | |
3061 | static void |
3062 | setalias(const char *name, const char *val) |
3063 | { |
3064 | struct alias *ap, **app; |
3065 | |
3066 | app = __lookupalias(name); |
3067 | ap = *app; |
3068 | INT_OFF; |
3069 | if (ap) { |
3070 | if (!(ap->flag & ALIASINUSE)) { |
3071 | free(ap->val); |
3072 | } |
3073 | ap->val = ckstrdup(val); |
3074 | ap->flag &= ~ALIASDEAD; |
3075 | } else { |
3076 | /* not found */ |
3077 | ap = ckzalloc(sizeof(struct alias)); |
3078 | ap->name = ckstrdup(name); |
3079 | ap->val = ckstrdup(val); |
3080 | /*ap->flag = 0; - ckzalloc did it */ |
3081 | /*ap->next = NULL;*/ |
3082 | *app = ap; |
3083 | } |
3084 | INT_ON; |
3085 | } |
3086 | |
3087 | static int |
3088 | unalias(const char *name) |
3089 | { |
3090 | struct alias **app; |
3091 | |
3092 | app = __lookupalias(name); |
3093 | |
3094 | if (*app) { |
3095 | INT_OFF; |
3096 | *app = freealias(*app); |
3097 | INT_ON; |
3098 | return 0; |
3099 | } |
3100 | |
3101 | return 1; |
3102 | } |
3103 | |
3104 | static void |
3105 | rmaliases(void) |
3106 | { |
3107 | struct alias *ap, **app; |
3108 | int i; |
3109 | |
3110 | INT_OFF; |
3111 | for (i = 0; i < ATABSIZE; i++) { |
3112 | app = &atab[i]; |
3113 | for (ap = *app; ap; ap = *app) { |
3114 | *app = freealias(*app); |
3115 | if (ap == *app) { |
3116 | app = &ap->next; |
3117 | } |
3118 | } |
3119 | } |
3120 | INT_ON; |
3121 | } |
3122 | |
3123 | static void |
3124 | printalias(const struct alias *ap) |
3125 | { |
3126 | out1fmt("%s=%s\n", ap->name, single_quote(ap->val)); |
3127 | } |
3128 | |
3129 | /* |
3130 | * TODO - sort output |
3131 | */ |
3132 | static int FAST_FUNC |
3133 | aliascmd(int argc UNUSED_PARAM, char **argv) |
3134 | { |
3135 | char *n, *v; |
3136 | int ret = 0; |
3137 | struct alias *ap; |
3138 | |
3139 | if (!argv[1]) { |
3140 | int i; |
3141 | |
3142 | for (i = 0; i < ATABSIZE; i++) { |
3143 | for (ap = atab[i]; ap; ap = ap->next) { |
3144 | printalias(ap); |
3145 | } |
3146 | } |
3147 | return 0; |
3148 | } |
3149 | while ((n = *++argv) != NULL) { |
3150 | v = strchr(n+1, '='); |
3151 | if (v == NULL) { /* n+1: funny ksh stuff */ |
3152 | ap = *__lookupalias(n); |
3153 | if (ap == NULL) { |
3154 | fprintf(stderr, "%s: %s not found\n", "alias", n); |
3155 | ret = 1; |
3156 | } else |
3157 | printalias(ap); |
3158 | } else { |
3159 | *v++ = '\0'; |
3160 | setalias(n, v); |
3161 | } |
3162 | } |
3163 | |
3164 | return ret; |
3165 | } |
3166 | |
3167 | static int FAST_FUNC |
3168 | unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
3169 | { |
3170 | int i; |
3171 | |
3172 | while ((i = nextopt("a")) != '\0') { |
3173 | if (i == 'a') { |
3174 | rmaliases(); |
3175 | return 0; |
3176 | } |
3177 | } |
3178 | for (i = 0; *argptr; argptr++) { |
3179 | if (unalias(*argptr)) { |
3180 | fprintf(stderr, "%s: %s not found\n", "unalias", *argptr); |
3181 | i = 1; |
3182 | } |
3183 | } |
3184 | |
3185 | return i; |
3186 | } |
3187 | |
3188 | #endif /* ASH_ALIAS */ |
3189 | |
3190 | |
3191 | /* ============ jobs.c */ |
3192 | |
3193 | /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */ |
3194 | #define FORK_FG 0 |
3195 | #define FORK_BG 1 |
3196 | #define FORK_NOJOB 2 |
3197 | |
3198 | /* mode flags for showjob(s) */ |
3199 | #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */ |
3200 | #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */ |
3201 | #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */ |
3202 | |
3203 | /* |
3204 | * A job structure contains information about a job. A job is either a |
3205 | * single process or a set of processes contained in a pipeline. In the |
3206 | * latter case, pidlist will be non-NULL, and will point to a -1 terminated |
3207 | * array of pids. |
3208 | */ |
3209 | struct procstat { |
3210 | pid_t ps_pid; /* process id */ |
3211 | int ps_status; /* last process status from wait() */ |
3212 | char *ps_cmd; /* text of command being run */ |
3213 | }; |
3214 | |
3215 | struct job { |
3216 | struct procstat ps0; /* status of process */ |
3217 | struct procstat *ps; /* status or processes when more than one */ |
3218 | #if JOBS |
3219 | int stopstatus; /* status of a stopped job */ |
3220 | #endif |
3221 | uint32_t |
3222 | nprocs: 16, /* number of processes */ |
3223 | state: 8, |
3224 | #define JOBRUNNING 0 /* at least one proc running */ |
3225 | #define JOBSTOPPED 1 /* all procs are stopped */ |
3226 | #define JOBDONE 2 /* all procs are completed */ |
3227 | #if JOBS |
3228 | sigint: 1, /* job was killed by SIGINT */ |
3229 | jobctl: 1, /* job running under job control */ |
3230 | #endif |
3231 | waited: 1, /* true if this entry has been waited for */ |
3232 | used: 1, /* true if this entry is in used */ |
3233 | changed: 1; /* true if status has changed */ |
3234 | struct job *prev_job; /* previous job */ |
3235 | }; |
3236 | |
3237 | static struct job *makejob(/*union node *,*/ int); |
3238 | static int forkshell(struct job *, union node *, int); |
3239 | static int waitforjob(struct job *); |
3240 | |
3241 | #if !JOBS |
3242 | enum { doing_jobctl = 0 }; |
3243 | #define setjobctl(on) do {} while (0) |
3244 | #else |
3245 | static smallint doing_jobctl; //references:8 |
3246 | static void setjobctl(int); |
3247 | #endif |
3248 | |
3249 | /* |
3250 | * Ignore a signal. |
3251 | */ |
3252 | static void |
3253 | ignoresig(int signo) |
3254 | { |
3255 | /* Avoid unnecessary system calls. Is it already SIG_IGNed? */ |
3256 | if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) { |
3257 | /* No, need to do it */ |
3258 | signal(signo, SIG_IGN); |
3259 | } |
3260 | sigmode[signo - 1] = S_HARD_IGN; |
3261 | } |
3262 | |
3263 | /* |
3264 | * Only one usage site - in setsignal() |
3265 | */ |
3266 | static void |
3267 | signal_handler(int signo) |
3268 | { |
3269 | gotsig[signo - 1] = 1; |
3270 | |
3271 | if (signo == SIGINT && !trap[SIGINT]) { |
3272 | if (!suppress_int) { |
3273 | pending_sig = 0; |
3274 | raise_interrupt(); /* does not return */ |
3275 | } |
3276 | pending_int = 1; |
3277 | } else { |
3278 | pending_sig = signo; |
3279 | } |
3280 | } |
3281 | |
3282 | /* |
3283 | * Set the signal handler for the specified signal. The routine figures |
3284 | * out what it should be set to. |
3285 | */ |
3286 | static void |
3287 | setsignal(int signo) |
3288 | { |
3289 | char *t; |
3290 | char cur_act, new_act; |
3291 | struct sigaction act; |
3292 | |
3293 | t = trap[signo]; |
3294 | new_act = S_DFL; |
3295 | if (t != NULL) { /* trap for this sig is set */ |
3296 | new_act = S_CATCH; |
3297 | if (t[0] == '\0') /* trap is "": ignore this sig */ |
3298 | new_act = S_IGN; |
3299 | } |
3300 | |
3301 | if (rootshell && new_act == S_DFL) { |
3302 | switch (signo) { |
3303 | case SIGINT: |
3304 | if (iflag || minusc || sflag == 0) |
3305 | new_act = S_CATCH; |
3306 | break; |
3307 | case SIGQUIT: |
3308 | #if DEBUG |
3309 | if (debug) |
3310 | break; |
3311 | #endif |
3312 | /* man bash: |
3313 | * "In all cases, bash ignores SIGQUIT. Non-builtin |
3314 | * commands run by bash have signal handlers |
3315 | * set to the values inherited by the shell |
3316 | * from its parent". */ |
3317 | new_act = S_IGN; |
3318 | break; |
3319 | case SIGTERM: |
3320 | if (iflag) |
3321 | new_act = S_IGN; |
3322 | break; |
3323 | #if JOBS |
3324 | case SIGTSTP: |
3325 | case SIGTTOU: |
3326 | if (mflag) |
3327 | new_act = S_IGN; |
3328 | break; |
3329 | #endif |
3330 | } |
3331 | } |
3332 | //TODO: if !rootshell, we reset SIGQUIT to DFL, |
3333 | //whereas we have to restore it to what shell got on entry |
3334 | //from the parent. See comment above |
3335 | |
3336 | t = &sigmode[signo - 1]; |
3337 | cur_act = *t; |
3338 | if (cur_act == 0) { |
3339 | /* current setting is not yet known */ |
3340 | if (sigaction(signo, NULL, &act)) { |
3341 | /* pretend it worked; maybe we should give a warning, |
3342 | * but other shells don't. We don't alter sigmode, |
3343 | * so we retry every time. |
3344 | * btw, in Linux it never fails. --vda */ |
3345 | return; |
3346 | } |
3347 | if (act.sa_handler == SIG_IGN) { |
3348 | cur_act = S_HARD_IGN; |
3349 | if (mflag |
3350 | && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU) |
3351 | ) { |
3352 | cur_act = S_IGN; /* don't hard ignore these */ |
3353 | } |
3354 | } |
3355 | } |
3356 | if (cur_act == S_HARD_IGN || cur_act == new_act) |
3357 | return; |
3358 | |
3359 | act.sa_handler = SIG_DFL; |
3360 | switch (new_act) { |
3361 | case S_CATCH: |
3362 | act.sa_handler = signal_handler; |
3363 | act.sa_flags = 0; /* matters only if !DFL and !IGN */ |
3364 | sigfillset(&act.sa_mask); /* ditto */ |
3365 | break; |
3366 | case S_IGN: |
3367 | act.sa_handler = SIG_IGN; |
3368 | break; |
3369 | } |
3370 | sigaction_set(signo, &act); |
3371 | |
3372 | *t = new_act; |
3373 | } |
3374 | |
3375 | /* mode flags for set_curjob */ |
3376 | #define CUR_DELETE 2 |
3377 | #define CUR_RUNNING 1 |
3378 | #define CUR_STOPPED 0 |
3379 | |
3380 | /* mode flags for dowait */ |
3381 | #define DOWAIT_NONBLOCK WNOHANG |
3382 | #define DOWAIT_BLOCK 0 |
3383 | |
3384 | #if JOBS |
3385 | /* pgrp of shell on invocation */ |
3386 | static int initialpgrp; //references:2 |
3387 | static int ttyfd = -1; //5 |
3388 | #endif |
3389 | /* array of jobs */ |
3390 | static struct job *jobtab; //5 |
3391 | /* size of array */ |
3392 | static unsigned njobs; //4 |
3393 | /* current job */ |
3394 | static struct job *curjob; //lots |
3395 | /* number of presumed living untracked jobs */ |
3396 | static int jobless; //4 |
3397 | |
3398 | static void |
3399 | set_curjob(struct job *jp, unsigned mode) |
3400 | { |
3401 | struct job *jp1; |
3402 | struct job **jpp, **curp; |
3403 | |
3404 | /* first remove from list */ |
3405 | jpp = curp = &curjob; |
3406 | do { |
3407 | jp1 = *jpp; |
3408 | if (jp1 == jp) |
3409 | break; |
3410 | jpp = &jp1->prev_job; |
3411 | } while (1); |
3412 | *jpp = jp1->prev_job; |
3413 | |
3414 | /* Then re-insert in correct position */ |
3415 | jpp = curp; |
3416 | switch (mode) { |
3417 | default: |
3418 | #if DEBUG |
3419 | abort(); |
3420 | #endif |
3421 | case CUR_DELETE: |
3422 | /* job being deleted */ |
3423 | break; |
3424 | case CUR_RUNNING: |
3425 | /* newly created job or backgrounded job, |
3426 | put after all stopped jobs. */ |
3427 | do { |
3428 | jp1 = *jpp; |
3429 | #if JOBS |
3430 | if (!jp1 || jp1->state != JOBSTOPPED) |
3431 | #endif |
3432 | break; |
3433 | jpp = &jp1->prev_job; |
3434 | } while (1); |
3435 | /* FALLTHROUGH */ |
3436 | #if JOBS |
3437 | case CUR_STOPPED: |
3438 | #endif |
3439 | /* newly stopped job - becomes curjob */ |
3440 | jp->prev_job = *jpp; |
3441 | *jpp = jp; |
3442 | break; |
3443 | } |
3444 | } |
3445 | |
3446 | #if JOBS || DEBUG |
3447 | static int |
3448 | jobno(const struct job *jp) |
3449 | { |
3450 | return jp - jobtab + 1; |
3451 | } |
3452 | #endif |
3453 | |
3454 | /* |
3455 | * Convert a job name to a job structure. |
3456 | */ |
3457 | #if !JOBS |
3458 | #define getjob(name, getctl) getjob(name) |
3459 | #endif |
3460 | static struct job * |
3461 | getjob(const char *name, int getctl) |
3462 | { |
3463 | struct job *jp; |
3464 | struct job *found; |
3465 | const char *err_msg = "%s: no such job"; |
3466 | unsigned num; |
3467 | int c; |
3468 | const char *p; |
3469 | char *(*match)(const char *, const char *); |
3470 | |
3471 | jp = curjob; |
3472 | p = name; |
3473 | if (!p) |
3474 | goto currentjob; |
3475 | |
3476 | if (*p != '%') |
3477 | goto err; |
3478 | |
3479 | c = *++p; |
3480 | if (!c) |
3481 | goto currentjob; |
3482 | |
3483 | if (!p[1]) { |
3484 | if (c == '+' || c == '%') { |
3485 | currentjob: |
3486 | err_msg = "No current job"; |
3487 | goto check; |
3488 | } |
3489 | if (c == '-') { |
3490 | if (jp) |
3491 | jp = jp->prev_job; |
3492 | err_msg = "No previous job"; |
3493 | check: |
3494 | if (!jp) |
3495 | goto err; |
3496 | goto gotit; |
3497 | } |
3498 | } |
3499 | |
3500 | if (is_number(p)) { |
3501 | num = atoi(p); |
3502 | if (num < njobs) { |
3503 | jp = jobtab + num - 1; |
3504 | if (jp->used) |
3505 | goto gotit; |
3506 | goto err; |
3507 | } |
3508 | } |
3509 | |
3510 | match = prefix; |
3511 | if (*p == '?') { |
3512 | match = strstr; |
3513 | p++; |
3514 | } |
3515 | |
3516 | found = NULL; |
3517 | while (jp) { |
3518 | if (match(jp->ps[0].ps_cmd, p)) { |
3519 | if (found) |
3520 | goto err; |
3521 | found = jp; |
3522 | err_msg = "%s: ambiguous"; |
3523 | } |
3524 | jp = jp->prev_job; |
3525 | } |
3526 | if (!found) |
3527 | goto err; |
3528 | jp = found; |
3529 | |
3530 | gotit: |
3531 | #if JOBS |
3532 | err_msg = "job %s not created under job control"; |
3533 | if (getctl && jp->jobctl == 0) |
3534 | goto err; |
3535 | #endif |
3536 | return jp; |
3537 | err: |
3538 | ash_msg_and_raise_error(err_msg, name); |
3539 | } |
3540 | |
3541 | /* |
3542 | * Mark a job structure as unused. |
3543 | */ |
3544 | static void |
3545 | freejob(struct job *jp) |
3546 | { |
3547 | struct procstat *ps; |
3548 | int i; |
3549 | |
3550 | INT_OFF; |
3551 | for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) { |
3552 | if (ps->ps_cmd != nullstr) |
3553 | free(ps->ps_cmd); |
3554 | } |
3555 | if (jp->ps != &jp->ps0) |
3556 | free(jp->ps); |
3557 | jp->used = 0; |
3558 | set_curjob(jp, CUR_DELETE); |
3559 | INT_ON; |
3560 | } |
3561 | |
3562 | #if JOBS |
3563 | static void |
3564 | xtcsetpgrp(int fd, pid_t pgrp) |
3565 | { |
3566 | if (tcsetpgrp(fd, pgrp)) |
3567 | ash_msg_and_raise_error("can't set tty process group (%m)"); |
3568 | } |
3569 | |
3570 | /* |
3571 | * Turn job control on and off. |
3572 | * |
3573 | * Note: This code assumes that the third arg to ioctl is a character |
3574 | * pointer, which is true on Berkeley systems but not System V. Since |
3575 | * System V doesn't have job control yet, this isn't a problem now. |
3576 | * |
3577 | * Called with interrupts off. |
3578 | */ |
3579 | static void |
3580 | setjobctl(int on) |
3581 | { |
3582 | int fd; |
3583 | int pgrp; |
3584 | |
3585 | if (on == doing_jobctl || rootshell == 0) |
3586 | return; |
3587 | if (on) { |
3588 | int ofd; |
3589 | ofd = fd = open(_PATH_TTY, O_RDWR); |
3590 | if (fd < 0) { |
3591 | /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails. |
3592 | * That sometimes helps to acquire controlling tty. |
3593 | * Obviously, a workaround for bugs when someone |
3594 | * failed to provide a controlling tty to bash! :) */ |
3595 | fd = 2; |
3596 | while (!isatty(fd)) |
3597 | if (--fd < 0) |
3598 | goto out; |
3599 | } |
3600 | fd = fcntl(fd, F_DUPFD, 10); |
3601 | if (ofd >= 0) |
3602 | close(ofd); |
3603 | if (fd < 0) |
3604 | goto out; |
3605 | /* fd is a tty at this point */ |
3606 | close_on_exec_on(fd); |
3607 | do { /* while we are in the background */ |
3608 | pgrp = tcgetpgrp(fd); |
3609 | if (pgrp < 0) { |
3610 | out: |
3611 | ash_msg("can't access tty; job control turned off"); |
3612 | mflag = on = 0; |
3613 | goto close; |
3614 | } |
3615 | if (pgrp == getpgrp()) |
3616 | break; |
3617 | killpg(0, SIGTTIN); |
3618 | } while (1); |
3619 | initialpgrp = pgrp; |
3620 | |
3621 | setsignal(SIGTSTP); |
3622 | setsignal(SIGTTOU); |
3623 | setsignal(SIGTTIN); |
3624 | pgrp = rootpid; |
3625 | setpgid(0, pgrp); |
3626 | xtcsetpgrp(fd, pgrp); |
3627 | } else { |
3628 | /* turning job control off */ |
3629 | fd = ttyfd; |
3630 | pgrp = initialpgrp; |
3631 | /* was xtcsetpgrp, but this can make exiting ash |
3632 | * loop forever if pty is already deleted */ |
3633 | tcsetpgrp(fd, pgrp); |
3634 | setpgid(0, pgrp); |
3635 | setsignal(SIGTSTP); |
3636 | setsignal(SIGTTOU); |
3637 | setsignal(SIGTTIN); |
3638 | close: |
3639 | if (fd >= 0) |
3640 | close(fd); |
3641 | fd = -1; |
3642 | } |
3643 | ttyfd = fd; |
3644 | doing_jobctl = on; |
3645 | } |
3646 | |
3647 | static int FAST_FUNC |
3648 | killcmd(int argc, char **argv) |
3649 | { |
3650 | int i = 1; |
3651 | if (argv[1] && strcmp(argv[1], "-l") != 0) { |
3652 | do { |
3653 | if (argv[i][0] == '%') { |
3654 | struct job *jp = getjob(argv[i], 0); |
3655 | unsigned pid = jp->ps[0].ps_pid; |
3656 | /* Enough space for ' -NNN<nul>' */ |
3657 | argv[i] = alloca(sizeof(int)*3 + 3); |
3658 | /* kill_main has matching code to expect |
3659 | * leading space. Needed to not confuse |
3660 | * negative pids with "kill -SIGNAL_NO" syntax */ |
3661 | sprintf(argv[i], " -%u", pid); |
3662 | } |
3663 | } while (argv[++i]); |
3664 | } |
3665 | return kill_main(argc, argv); |
3666 | } |
3667 | |
3668 | static void |
3669 | showpipe(struct job *jp /*, FILE *out*/) |
3670 | { |
3671 | struct procstat *ps; |
3672 | struct procstat *psend; |
3673 | |
3674 | psend = jp->ps + jp->nprocs; |
3675 | for (ps = jp->ps + 1; ps < psend; ps++) |
3676 | printf(" | %s", ps->ps_cmd); |
3677 | outcslow('\n', stdout); |
3678 | flush_stdout_stderr(); |
3679 | } |
3680 | |
3681 | |
3682 | static int |
3683 | restartjob(struct job *jp, int mode) |
3684 | { |
3685 | struct procstat *ps; |
3686 | int i; |
3687 | int status; |
3688 | pid_t pgid; |
3689 | |
3690 | INT_OFF; |
3691 | if (jp->state == JOBDONE) |
3692 | goto out; |
3693 | jp->state = JOBRUNNING; |
3694 | pgid = jp->ps[0].ps_pid; |
3695 | if (mode == FORK_FG) |
3696 | xtcsetpgrp(ttyfd, pgid); |
3697 | killpg(pgid, SIGCONT); |
3698 | ps = jp->ps; |
3699 | i = jp->nprocs; |
3700 | do { |
3701 | if (WIFSTOPPED(ps->ps_status)) { |
3702 | ps->ps_status = -1; |
3703 | } |
3704 | ps++; |
3705 | } while (--i); |
3706 | out: |
3707 | status = (mode == FORK_FG) ? waitforjob(jp) : 0; |
3708 | INT_ON; |
3709 | return status; |
3710 | } |
3711 | |
3712 | static int FAST_FUNC |
3713 | fg_bgcmd(int argc UNUSED_PARAM, char **argv) |
3714 | { |
3715 | struct job *jp; |
3716 | int mode; |
3717 | int retval; |
3718 | |
3719 | mode = (**argv == 'f') ? FORK_FG : FORK_BG; |
3720 | nextopt(nullstr); |
3721 | argv = argptr; |
3722 | do { |
3723 | jp = getjob(*argv, 1); |
3724 | if (mode == FORK_BG) { |
3725 | set_curjob(jp, CUR_RUNNING); |
3726 | printf("[%d] ", jobno(jp)); |
3727 | } |
3728 | out1str(jp->ps[0].ps_cmd); |
3729 | showpipe(jp /*, stdout*/); |
3730 | retval = restartjob(jp, mode); |
3731 | } while (*argv && *++argv); |
3732 | return retval; |
3733 | } |
3734 | #endif |
3735 | |
3736 | static int |
3737 | sprint_status(char *s, int status, int sigonly) |
3738 | { |
3739 | int col; |
3740 | int st; |
3741 | |
3742 | col = 0; |
3743 | if (!WIFEXITED(status)) { |
3744 | #if JOBS |
3745 | if (WIFSTOPPED(status)) |
3746 | st = WSTOPSIG(status); |
3747 | else |
3748 | #endif |
3749 | st = WTERMSIG(status); |
3750 | if (sigonly) { |
3751 | if (st == SIGINT || st == SIGPIPE) |
3752 | goto out; |
3753 | #if JOBS |
3754 | if (WIFSTOPPED(status)) |
3755 | goto out; |
3756 | #endif |
3757 | } |
3758 | st &= 0x7f; |
3759 | col = fmtstr(s, 32, strsignal(st)); |
3760 | if (WCOREDUMP(status)) { |
3761 | col += fmtstr(s + col, 16, " (core dumped)"); |
3762 | } |
3763 | } else if (!sigonly) { |
3764 | st = WEXITSTATUS(status); |
3765 | if (st) |
3766 | col = fmtstr(s, 16, "Done(%d)", st); |
3767 | else |
3768 | col = fmtstr(s, 16, "Done"); |
3769 | } |
3770 | out: |
3771 | return col; |
3772 | } |
3773 | |
3774 | static int |
3775 | dowait(int wait_flags, struct job *job) |
3776 | { |
3777 | int pid; |
3778 | int status; |
3779 | struct job *jp; |
3780 | struct job *thisjob; |
3781 | int state; |
3782 | |
3783 | TRACE(("dowait(0x%x) called\n", wait_flags)); |
3784 | |
3785 | /* Do a wait system call. If job control is compiled in, we accept |
3786 | * stopped processes. wait_flags may have WNOHANG, preventing blocking. |
3787 | * NB: _not_ safe_waitpid, we need to detect EINTR */ |
3788 | if (doing_jobctl) |
3789 | wait_flags |= WUNTRACED; |
3790 | pid = waitpid(-1, &status, wait_flags); |
3791 | TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n", |
3792 | pid, status, errno, strerror(errno))); |
3793 | if (pid <= 0) |
3794 | return pid; |
3795 | |
3796 | INT_OFF; |
3797 | thisjob = NULL; |
3798 | for (jp = curjob; jp; jp = jp->prev_job) { |
3799 | struct procstat *ps; |
3800 | struct procstat *psend; |
3801 | if (jp->state == JOBDONE) |
3802 | continue; |
3803 | state = JOBDONE; |
3804 | ps = jp->ps; |
3805 | psend = ps + jp->nprocs; |
3806 | do { |
3807 | if (ps->ps_pid == pid) { |
3808 | TRACE(("Job %d: changing status of proc %d " |
3809 | "from 0x%x to 0x%x\n", |
3810 | jobno(jp), pid, ps->ps_status, status)); |
3811 | ps->ps_status = status; |
3812 | thisjob = jp; |
3813 | } |
3814 | if (ps->ps_status == -1) |
3815 | state = JOBRUNNING; |
3816 | #if JOBS |
3817 | if (state == JOBRUNNING) |
3818 | continue; |
3819 | if (WIFSTOPPED(ps->ps_status)) { |
3820 | jp->stopstatus = ps->ps_status; |
3821 | state = JOBSTOPPED; |
3822 | } |
3823 | #endif |
3824 | } while (++ps < psend); |
3825 | if (thisjob) |
3826 | goto gotjob; |
3827 | } |
3828 | #if JOBS |
3829 | if (!WIFSTOPPED(status)) |
3830 | #endif |
3831 | jobless--; |
3832 | goto out; |
3833 | |
3834 | gotjob: |
3835 | if (state != JOBRUNNING) { |
3836 | thisjob->changed = 1; |
3837 | |
3838 | if (thisjob->state != state) { |
3839 | TRACE(("Job %d: changing state from %d to %d\n", |
3840 | jobno(thisjob), thisjob->state, state)); |
3841 | thisjob->state = state; |
3842 | #if JOBS |
3843 | if (state == JOBSTOPPED) { |
3844 | set_curjob(thisjob, CUR_STOPPED); |
3845 | } |
3846 | #endif |
3847 | } |
3848 | } |
3849 | |
3850 | out: |
3851 | INT_ON; |
3852 | |
3853 | if (thisjob && thisjob == job) { |
3854 | char s[48 + 1]; |
3855 | int len; |
3856 | |
3857 | len = sprint_status(s, status, 1); |
3858 | if (len) { |
3859 | s[len] = '\n'; |
3860 | s[len + 1] = '\0'; |
3861 | out2str(s); |
3862 | } |
3863 | } |
3864 | return pid; |
3865 | } |
3866 | |
3867 | static int |
3868 | blocking_wait_with_raise_on_sig(void) |
3869 | { |
3870 | pid_t pid = dowait(DOWAIT_BLOCK, NULL); |
3871 | if (pid <= 0 && pending_sig) |
3872 | raise_exception(EXSIG); |
3873 | return pid; |
3874 | } |
3875 | |
3876 | #if JOBS |
3877 | static void |
3878 | showjob(FILE *out, struct job *jp, int mode) |
3879 | { |
3880 | struct procstat *ps; |
3881 | struct procstat *psend; |
3882 | int col; |
3883 | int indent_col; |
3884 | char s[80]; |
3885 | |
3886 | ps = jp->ps; |
3887 | |
3888 | if (mode & SHOW_ONLY_PGID) { /* jobs -p */ |
3889 | /* just output process (group) id of pipeline */ |
3890 | fprintf(out, "%d\n", ps->ps_pid); |
3891 | return; |
3892 | } |
3893 | |
3894 | col = fmtstr(s, 16, "[%d] ", jobno(jp)); |
3895 | indent_col = col; |
3896 | |
3897 | if (jp == curjob) |
3898 | s[col - 3] = '+'; |
3899 | else if (curjob && jp == curjob->prev_job) |
3900 | s[col - 3] = '-'; |
3901 | |
3902 | if (mode & SHOW_PIDS) |
3903 | col += fmtstr(s + col, 16, "%d ", ps->ps_pid); |
3904 | |
3905 | psend = ps + jp->nprocs; |
3906 | |
3907 | if (jp->state == JOBRUNNING) { |
3908 | strcpy(s + col, "Running"); |
3909 | col += sizeof("Running") - 1; |
3910 | } else { |
3911 | int status = psend[-1].ps_status; |
3912 | if (jp->state == JOBSTOPPED) |
3913 | status = jp->stopstatus; |
3914 | col += sprint_status(s + col, status, 0); |
3915 | } |
3916 | /* By now, "[JOBID]* [maybe PID] STATUS" is printed */ |
3917 | |
3918 | /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line |
3919 | * or prints several "PID | <cmdN>" lines, |
3920 | * depending on SHOW_PIDS bit. |
3921 | * We do not print status of individual processes |
3922 | * between PID and <cmdN>. bash does it, but not very well: |
3923 | * first line shows overall job status, not process status, |
3924 | * making it impossible to know 1st process status. |
3925 | */ |
3926 | goto start; |
3927 | do { |
3928 | /* for each process */ |
3929 | s[0] = '\0'; |
3930 | col = 33; |
3931 | if (mode & SHOW_PIDS) |
3932 | col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1; |
3933 | start: |
3934 | fprintf(out, "%s%*c%s%s", |
3935 | s, |
3936 | 33 - col >= 0 ? 33 - col : 0, ' ', |
3937 | ps == jp->ps ? "" : "| ", |
3938 | ps->ps_cmd |
3939 | ); |
3940 | } while (++ps != psend); |
3941 | outcslow('\n', out); |
3942 | |
3943 | jp->changed = 0; |
3944 | |
3945 | if (jp->state == JOBDONE) { |
3946 | TRACE(("showjob: freeing job %d\n", jobno(jp))); |
3947 | freejob(jp); |
3948 | } |
3949 | } |
3950 | |
3951 | /* |
3952 | * Print a list of jobs. If "change" is nonzero, only print jobs whose |
3953 | * statuses have changed since the last call to showjobs. |
3954 | */ |
3955 | static void |
3956 | showjobs(FILE *out, int mode) |
3957 | { |
3958 | struct job *jp; |
3959 | |
3960 | TRACE(("showjobs(0x%x) called\n", mode)); |
3961 | |
3962 | /* Handle all finished jobs */ |
3963 | while (dowait(DOWAIT_NONBLOCK, NULL) > 0) |
3964 | continue; |
3965 | |
3966 | for (jp = curjob; jp; jp = jp->prev_job) { |
3967 | if (!(mode & SHOW_CHANGED) || jp->changed) { |
3968 | showjob(out, jp, mode); |
3969 | } |
3970 | } |
3971 | } |
3972 | |
3973 | static int FAST_FUNC |
3974 | jobscmd(int argc UNUSED_PARAM, char **argv) |
3975 | { |
3976 | int mode, m; |
3977 | |
3978 | mode = 0; |
3979 | while ((m = nextopt("lp")) != '\0') { |
3980 | if (m == 'l') |
3981 | mode |= SHOW_PIDS; |
3982 | else |
3983 | mode |= SHOW_ONLY_PGID; |
3984 | } |
3985 | |
3986 | argv = argptr; |
3987 | if (*argv) { |
3988 | do |
3989 | showjob(stdout, getjob(*argv, 0), mode); |
3990 | while (*++argv); |
3991 | } else { |
3992 | showjobs(stdout, mode); |
3993 | } |
3994 | |
3995 | return 0; |
3996 | } |
3997 | #endif /* JOBS */ |
3998 | |
3999 | /* Called only on finished or stopped jobs (no members are running) */ |
4000 | static int |
4001 | getstatus(struct job *job) |
4002 | { |
4003 | int status; |
4004 | int retval; |
4005 | struct procstat *ps; |
4006 | |
4007 | /* Fetch last member's status */ |
4008 | ps = job->ps + job->nprocs - 1; |
4009 | status = ps->ps_status; |
4010 | if (pipefail) { |
4011 | /* "set -o pipefail" mode: use last _nonzero_ status */ |
4012 | while (status == 0 && --ps >= job->ps) |
4013 | status = ps->ps_status; |
4014 | } |
4015 | |
4016 | retval = WEXITSTATUS(status); |
4017 | if (!WIFEXITED(status)) { |
4018 | #if JOBS |
4019 | retval = WSTOPSIG(status); |
4020 | if (!WIFSTOPPED(status)) |
4021 | #endif |
4022 | { |
4023 | /* XXX: limits number of signals */ |
4024 | retval = WTERMSIG(status); |
4025 | #if JOBS |
4026 | if (retval == SIGINT) |
4027 | job->sigint = 1; |
4028 | #endif |
4029 | } |
4030 | retval += 128; |
4031 | } |
4032 | TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n", |
4033 | jobno(job), job->nprocs, status, retval)); |
4034 | return retval; |
4035 | } |
4036 | |
4037 | static int FAST_FUNC |
4038 | waitcmd(int argc UNUSED_PARAM, char **argv) |
4039 | { |
4040 | struct job *job; |
4041 | int retval; |
4042 | struct job *jp; |
4043 | |
4044 | if (pending_sig) |
4045 | raise_exception(EXSIG); |
4046 | |
4047 | nextopt(nullstr); |
4048 | retval = 0; |
4049 | |
4050 | argv = argptr; |
4051 | if (!*argv) { |
4052 | /* wait for all jobs */ |
4053 | for (;;) { |
4054 | jp = curjob; |
4055 | while (1) { |
4056 | if (!jp) /* no running procs */ |
4057 | goto ret; |
4058 | if (jp->state == JOBRUNNING) |
4059 | break; |
4060 | jp->waited = 1; |
4061 | jp = jp->prev_job; |
4062 | } |
4063 | blocking_wait_with_raise_on_sig(); |
4064 | /* man bash: |
4065 | * "When bash is waiting for an asynchronous command via |
4066 | * the wait builtin, the reception of a signal for which a trap |
4067 | * has been set will cause the wait builtin to return immediately |
4068 | * with an exit status greater than 128, immediately after which |
4069 | * the trap is executed." |
4070 | * |
4071 | * blocking_wait_with_raise_on_sig raises signal handlers |
4072 | * if it gets no pid (pid < 0). However, |
4073 | * if child sends us a signal *and immediately exits*, |
4074 | * blocking_wait_with_raise_on_sig gets pid > 0 |
4075 | * and does not handle pending_sig. Check this case: */ |
4076 | if (pending_sig) |
4077 | raise_exception(EXSIG); |
4078 | } |
4079 | } |
4080 | |
4081 | retval = 127; |
4082 | do { |
4083 | if (**argv != '%') { |
4084 | pid_t pid = number(*argv); |
4085 | job = curjob; |
4086 | while (1) { |
4087 | if (!job) |
4088 | goto repeat; |
4089 | if (job->ps[job->nprocs - 1].ps_pid == pid) |
4090 | break; |
4091 | job = job->prev_job; |
4092 | } |
4093 | } else |
4094 | job = getjob(*argv, 0); |
4095 | /* loop until process terminated or stopped */ |
4096 | while (job->state == JOBRUNNING) |
4097 | blocking_wait_with_raise_on_sig(); |
4098 | job->waited = 1; |
4099 | retval = getstatus(job); |
4100 | repeat: ; |
4101 | } while (*++argv); |
4102 | |
4103 | ret: |
4104 | return retval; |
4105 | } |
4106 | |
4107 | static struct job * |
4108 | growjobtab(void) |
4109 | { |
4110 | size_t len; |
4111 | ptrdiff_t offset; |
4112 | struct job *jp, *jq; |
4113 | |
4114 | len = njobs * sizeof(*jp); |
4115 | jq = jobtab; |
4116 | jp = ckrealloc(jq, len + 4 * sizeof(*jp)); |
4117 | |
4118 | offset = (char *)jp - (char *)jq; |
4119 | if (offset) { |
4120 | /* Relocate pointers */ |
4121 | size_t l = len; |
4122 | |
4123 | jq = (struct job *)((char *)jq + l); |
4124 | while (l) { |
4125 | l -= sizeof(*jp); |
4126 | jq--; |
4127 | #define joff(p) ((struct job *)((char *)(p) + l)) |
4128 | #define jmove(p) (p) = (void *)((char *)(p) + offset) |
4129 | if (joff(jp)->ps == &jq->ps0) |
4130 | jmove(joff(jp)->ps); |
4131 | if (joff(jp)->prev_job) |
4132 | jmove(joff(jp)->prev_job); |
4133 | } |
4134 | if (curjob) |
4135 | jmove(curjob); |
4136 | #undef joff |
4137 | #undef jmove |
4138 | } |
4139 | |
4140 | njobs += 4; |
4141 | jobtab = jp; |
4142 | jp = (struct job *)((char *)jp + len); |
4143 | jq = jp + 3; |
4144 | do { |
4145 | jq->used = 0; |
4146 | } while (--jq >= jp); |
4147 | return jp; |
4148 | } |
4149 | |
4150 | /* |
4151 | * Return a new job structure. |
4152 | * Called with interrupts off. |
4153 | */ |
4154 | static struct job * |
4155 | makejob(/*union node *node,*/ int nprocs) |
4156 | { |
4157 | int i; |
4158 | struct job *jp; |
4159 | |
4160 | for (i = njobs, jp = jobtab; ; jp++) { |
4161 | if (--i < 0) { |
4162 | jp = growjobtab(); |
4163 | break; |
4164 | } |
4165 | if (jp->used == 0) |
4166 | break; |
4167 | if (jp->state != JOBDONE || !jp->waited) |
4168 | continue; |
4169 | #if JOBS |
4170 | if (doing_jobctl) |
4171 | continue; |
4172 | #endif |
4173 | freejob(jp); |
4174 | break; |
4175 | } |
4176 | memset(jp, 0, sizeof(*jp)); |
4177 | #if JOBS |
4178 | /* jp->jobctl is a bitfield. |
4179 | * "jp->jobctl |= jobctl" likely to give awful code */ |
4180 | if (doing_jobctl) |
4181 | jp->jobctl = 1; |
4182 | #endif |
4183 | jp->prev_job = curjob; |
4184 | curjob = jp; |
4185 | jp->used = 1; |
4186 | jp->ps = &jp->ps0; |
4187 | if (nprocs > 1) { |
4188 | jp->ps = ckmalloc(nprocs * sizeof(struct procstat)); |
4189 | } |
4190 | TRACE(("makejob(%d) returns %%%d\n", nprocs, |
4191 | jobno(jp))); |
4192 | return jp; |
4193 | } |
4194 | |
4195 | #if JOBS |
4196 | /* |
4197 | * Return a string identifying a command (to be printed by the |
4198 | * jobs command). |
4199 | */ |
4200 | static char *cmdnextc; |
4201 | |
4202 | static void |
4203 | cmdputs(const char *s) |
4204 | { |
4205 | static const char vstype[VSTYPE + 1][3] = { |
4206 | "", "}", "-", "+", "?", "=", |
4207 | "%", "%%", "#", "##" |
4208 | IF_ASH_BASH_COMPAT(, ":", "/", "//") |
4209 | }; |
4210 | |
4211 | const char *p, *str; |
4212 | char cc[2]; |
4213 | char *nextc; |
4214 | unsigned char c; |
4215 | unsigned char subtype = 0; |
4216 | int quoted = 0; |
4217 | |
4218 | cc[1] = '\0'; |
4219 | nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc); |
4220 | p = s; |
4221 | while ((c = *p++) != '\0') { |
4222 | str = NULL; |
4223 | switch (c) { |
4224 | case CTLESC: |
4225 | c = *p++; |
4226 | break; |
4227 | case CTLVAR: |
4228 | subtype = *p++; |
4229 | if ((subtype & VSTYPE) == VSLENGTH) |
4230 | str = "${#"; |
4231 | else |
4232 | str = "${"; |
4233 | if (!(subtype & VSQUOTE) == !(quoted & 1)) |
4234 | goto dostr; |
4235 | quoted ^= 1; |
4236 | c = '"'; |
4237 | break; |
4238 | case CTLENDVAR: |
4239 | str = "\"}" + !(quoted & 1); |
4240 | quoted >>= 1; |
4241 | subtype = 0; |
4242 | goto dostr; |
4243 | case CTLBACKQ: |
4244 | str = "$(...)"; |
4245 | goto dostr; |
4246 | case CTLBACKQ+CTLQUOTE: |
4247 | str = "\"$(...)\""; |
4248 | goto dostr; |
4249 | #if ENABLE_SH_MATH_SUPPORT |
4250 | case CTLARI: |
4251 | str = "$(("; |
4252 | goto dostr; |
4253 | case CTLENDARI: |
4254 | str = "))"; |
4255 | goto dostr; |
4256 | #endif |
4257 | case CTLQUOTEMARK: |
4258 | quoted ^= 1; |
4259 | c = '"'; |
4260 | break; |
4261 | case '=': |
4262 | if (subtype == 0) |
4263 | break; |
4264 | if ((subtype & VSTYPE) != VSNORMAL) |
4265 | quoted <<= 1; |
4266 | str = vstype[subtype & VSTYPE]; |
4267 | if (subtype & VSNUL) |
4268 | c = ':'; |
4269 | else |
4270 | goto checkstr; |
4271 | break; |
4272 | case '\'': |
4273 | case '\\': |
4274 | case '"': |
4275 | case '$': |
4276 | /* These can only happen inside quotes */ |
4277 | cc[0] = c; |
4278 | str = cc; |
4279 | c = '\\'; |
4280 | break; |
4281 | default: |
4282 | break; |
4283 | } |
4284 | USTPUTC(c, nextc); |
4285 | checkstr: |
4286 | if (!str) |
4287 | continue; |
4288 | dostr: |
4289 | while ((c = *str++) != '\0') { |
4290 | USTPUTC(c, nextc); |
4291 | } |
4292 | } /* while *p++ not NUL */ |
4293 | |
4294 | if (quoted & 1) { |
4295 | USTPUTC('"', nextc); |
4296 | } |
4297 | *nextc = 0; |
4298 | cmdnextc = nextc; |
4299 | } |
4300 | |
4301 | /* cmdtxt() and cmdlist() call each other */ |
4302 | static void cmdtxt(union node *n); |
4303 | |
4304 | static void |
4305 | cmdlist(union node *np, int sep) |
4306 | { |
4307 | for (; np; np = np->narg.next) { |
4308 | if (!sep) |
4309 | cmdputs(" "); |
4310 | cmdtxt(np); |
4311 | if (sep && np->narg.next) |
4312 | cmdputs(" "); |
4313 | } |
4314 | } |
4315 | |
4316 | static void |
4317 | cmdtxt(union node *n) |
4318 | { |
4319 | union node *np; |
4320 | struct nodelist *lp; |
4321 | const char *p; |
4322 | |
4323 | if (!n) |
4324 | return; |
4325 | switch (n->type) { |
4326 | default: |
4327 | #if DEBUG |
4328 | abort(); |
4329 | #endif |
4330 | case NPIPE: |
4331 | lp = n->npipe.cmdlist; |
4332 | for (;;) { |
4333 | cmdtxt(lp->n); |
4334 | lp = lp->next; |
4335 | if (!lp) |
4336 | break; |
4337 | cmdputs(" | "); |
4338 | } |
4339 | break; |
4340 | case NSEMI: |
4341 | p = "; "; |
4342 | goto binop; |
4343 | case NAND: |
4344 | p = " && "; |
4345 | goto binop; |
4346 | case NOR: |
4347 | p = " || "; |
4348 | binop: |
4349 | cmdtxt(n->nbinary.ch1); |
4350 | cmdputs(p); |
4351 | n = n->nbinary.ch2; |
4352 | goto donode; |
4353 | case NREDIR: |
4354 | case NBACKGND: |
4355 | n = n->nredir.n; |
4356 | goto donode; |
4357 | case NNOT: |
4358 | cmdputs("!"); |
4359 | n = n->nnot.com; |
4360 | donode: |
4361 | cmdtxt(n); |
4362 | break; |
4363 | case NIF: |
4364 | cmdputs("if "); |
4365 | cmdtxt(n->nif.test); |
4366 | cmdputs("; then "); |
4367 | if (n->nif.elsepart) { |
4368 | cmdtxt(n->nif.ifpart); |
4369 | cmdputs("; else "); |
4370 | n = n->nif.elsepart; |
4371 | } else { |
4372 | n = n->nif.ifpart; |
4373 | } |
4374 | p = "; fi"; |
4375 | goto dotail; |
4376 | case NSUBSHELL: |
4377 | cmdputs("("); |
4378 | n = n->nredir.n; |
4379 | p = ")"; |
4380 | goto dotail; |
4381 | case NWHILE: |
4382 | p = "while "; |
4383 | goto until; |
4384 | case NUNTIL: |
4385 | p = "until "; |
4386 | until: |
4387 | cmdputs(p); |
4388 | cmdtxt(n->nbinary.ch1); |
4389 | n = n->nbinary.ch2; |
4390 | p = "; done"; |
4391 | dodo: |
4392 | cmdputs("; do "); |
4393 | dotail: |
4394 | cmdtxt(n); |
4395 | goto dotail2; |
4396 | case NFOR: |
4397 | cmdputs("for "); |
4398 | cmdputs(n->nfor.var); |
4399 | cmdputs(" in "); |
4400 | cmdlist(n->nfor.args, 1); |
4401 | n = n->nfor.body; |
4402 | p = "; done"; |
4403 | goto dodo; |
4404 | case NDEFUN: |
4405 | cmdputs(n->narg.text); |
4406 | p = "() { ... }"; |
4407 | goto dotail2; |
4408 | case NCMD: |
4409 | cmdlist(n->ncmd.args, 1); |
4410 | cmdlist(n->ncmd.redirect, 0); |
4411 | break; |
4412 | case NARG: |
4413 | p = n->narg.text; |
4414 | dotail2: |
4415 | cmdputs(p); |
4416 | break; |
4417 | case NHERE: |
4418 | case NXHERE: |
4419 | p = "<<..."; |
4420 | goto dotail2; |
4421 | case NCASE: |
4422 | cmdputs("case "); |
4423 | cmdputs(n->ncase.expr->narg.text); |
4424 | cmdputs(" in "); |
4425 | for (np = n->ncase.cases; np; np = np->nclist.next) { |
4426 | cmdtxt(np->nclist.pattern); |
4427 | cmdputs(") "); |
4428 | cmdtxt(np->nclist.body); |
4429 | cmdputs(";; "); |
4430 | } |
4431 | p = "esac"; |
4432 | goto dotail2; |
4433 | case NTO: |
4434 | p = ">"; |
4435 | goto redir; |
4436 | case NCLOBBER: |
4437 | p = ">|"; |
4438 | goto redir; |
4439 | case NAPPEND: |
4440 | p = ">>"; |
4441 | goto redir; |
4442 | #if ENABLE_ASH_BASH_COMPAT |
4443 | case NTO2: |
4444 | #endif |
4445 | case NTOFD: |
4446 | p = ">&"; |
4447 | goto redir; |
4448 | case NFROM: |
4449 | p = "<"; |
4450 | goto redir; |
4451 | case NFROMFD: |
4452 | p = "<&"; |
4453 | goto redir; |
4454 | case NFROMTO: |
4455 | p = "<>"; |
4456 | redir: |
4457 | cmdputs(utoa(n->nfile.fd)); |
4458 | cmdputs(p); |
4459 | if (n->type == NTOFD || n->type == NFROMFD) { |
4460 | cmdputs(utoa(n->ndup.dupfd)); |
4461 | break; |
4462 | } |
4463 | n = n->nfile.fname; |
4464 | goto donode; |
4465 | } |
4466 | } |
4467 | |
4468 | static char * |
4469 | commandtext(union node *n) |
4470 | { |
4471 | char *name; |
4472 | |
4473 | STARTSTACKSTR(cmdnextc); |
4474 | cmdtxt(n); |
4475 | name = stackblock(); |
4476 | TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n", |
4477 | name, cmdnextc, cmdnextc)); |
4478 | return ckstrdup(name); |
4479 | } |
4480 | #endif /* JOBS */ |
4481 | |
4482 | /* |
4483 | * Fork off a subshell. If we are doing job control, give the subshell its |
4484 | * own process group. Jp is a job structure that the job is to be added to. |
4485 | * N is the command that will be evaluated by the child. Both jp and n may |
4486 | * be NULL. The mode parameter can be one of the following: |
4487 | * FORK_FG - Fork off a foreground process. |
4488 | * FORK_BG - Fork off a background process. |
4489 | * FORK_NOJOB - Like FORK_FG, but don't give the process its own |
4490 | * process group even if job control is on. |
4491 | * |
4492 | * When job control is turned off, background processes have their standard |
4493 | * input redirected to /dev/null (except for the second and later processes |
4494 | * in a pipeline). |
4495 | * |
4496 | * Called with interrupts off. |
4497 | */ |
4498 | /* |
4499 | * Clear traps on a fork. |
4500 | */ |
4501 | static void |
4502 | clear_traps(void) |
4503 | { |
4504 | char **tp; |
4505 | |
4506 | for (tp = trap; tp < &trap[NSIG]; tp++) { |
4507 | if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */ |
4508 | INT_OFF; |
4509 | if (trap_ptr == trap) |
4510 | free(*tp); |
4511 | /* else: it "belongs" to trap_ptr vector, don't free */ |
4512 | *tp = NULL; |
4513 | if ((tp - trap) != 0) |
4514 | setsignal(tp - trap); |
4515 | INT_ON; |
4516 | } |
4517 | } |
4518 | } |
4519 | |
4520 | /* Lives far away from here, needed for forkchild */ |
4521 | static void closescript(void); |
4522 | |
4523 | /* Called after fork(), in child */ |
4524 | static NOINLINE void |
4525 | forkchild(struct job *jp, union node *n, int mode) |
4526 | { |
4527 | int oldlvl; |
4528 | |
4529 | TRACE(("Child shell %d\n", getpid())); |
4530 | oldlvl = shlvl; |
4531 | shlvl++; |
4532 | |
4533 | /* man bash: "Non-builtin commands run by bash have signal handlers |
4534 | * set to the values inherited by the shell from its parent". |
4535 | * Do we do it correctly? */ |
4536 | |
4537 | closescript(); |
4538 | |
4539 | if (mode == FORK_NOJOB /* is it `xxx` ? */ |
4540 | && n && n->type == NCMD /* is it single cmd? */ |
4541 | /* && n->ncmd.args->type == NARG - always true? */ |
4542 | && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0 |
4543 | && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */ |
4544 | /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */ |
4545 | ) { |
4546 | TRACE(("Trap hack\n")); |
4547 | /* Awful hack for `trap` or $(trap). |
4548 | * |
4549 | * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html |
4550 | * contains an example where "trap" is executed in a subshell: |
4551 | * |
4552 | * save_traps=$(trap) |
4553 | * ... |
4554 | * eval "$save_traps" |
4555 | * |
4556 | * Standard does not say that "trap" in subshell shall print |
4557 | * parent shell's traps. It only says that its output |
4558 | * must have suitable form, but then, in the above example |
4559 | * (which is not supposed to be normative), it implies that. |
4560 | * |
4561 | * bash (and probably other shell) does implement it |
4562 | * (traps are reset to defaults, but "trap" still shows them), |
4563 | * but as a result, "trap" logic is hopelessly messed up: |
4564 | * |
4565 | * # trap |
4566 | * trap -- 'echo Ho' SIGWINCH <--- we have a handler |
4567 | * # (trap) <--- trap is in subshell - no output (correct, traps are reset) |
4568 | * # true | trap <--- trap is in subshell - no output (ditto) |
4569 | * # echo `true | trap` <--- in subshell - output (but traps are reset!) |
4570 | * trap -- 'echo Ho' SIGWINCH |
4571 | * # echo `(trap)` <--- in subshell in subshell - output |
4572 | * trap -- 'echo Ho' SIGWINCH |
4573 | * # echo `true | (trap)` <--- in subshell in subshell in subshell - output! |
4574 | * trap -- 'echo Ho' SIGWINCH |
4575 | * |
4576 | * The rules when to forget and when to not forget traps |
4577 | * get really complex and nonsensical. |
4578 | * |
4579 | * Our solution: ONLY bare $(trap) or `trap` is special. |
4580 | */ |
4581 | /* Save trap handler strings for trap builtin to print */ |
4582 | trap_ptr = memcpy(xmalloc(sizeof(trap)), trap, sizeof(trap)); |
4583 | /* Fall through into clearing traps */ |
4584 | } |
4585 | clear_traps(); |
4586 | #if JOBS |
4587 | /* do job control only in root shell */ |
4588 | doing_jobctl = 0; |
4589 | if (mode != FORK_NOJOB && jp->jobctl && !oldlvl) { |
4590 | pid_t pgrp; |
4591 | |
4592 | if (jp->nprocs == 0) |
4593 | pgrp = getpid(); |
4594 | else |
4595 | pgrp = jp->ps[0].ps_pid; |
4596 | /* this can fail because we are doing it in the parent also */ |
4597 | setpgid(0, pgrp); |
4598 | if (mode == FORK_FG) |
4599 | xtcsetpgrp(ttyfd, pgrp); |
4600 | setsignal(SIGTSTP); |
4601 | setsignal(SIGTTOU); |
4602 | } else |
4603 | #endif |
4604 | if (mode == FORK_BG) { |
4605 | /* man bash: "When job control is not in effect, |
4606 | * asynchronous commands ignore SIGINT and SIGQUIT" */ |
4607 | ignoresig(SIGINT); |
4608 | ignoresig(SIGQUIT); |
4609 | if (jp->nprocs == 0) { |
4610 | close(0); |
4611 | if (open(bb_dev_null, O_RDONLY) != 0) |
4612 | ash_msg_and_raise_error("can't open '%s'", bb_dev_null); |
4613 | } |
4614 | } |
4615 | if (!oldlvl) { |
4616 | if (iflag) { /* why if iflag only? */ |
4617 | setsignal(SIGINT); |
4618 | setsignal(SIGTERM); |
4619 | } |
4620 | /* man bash: |
4621 | * "In all cases, bash ignores SIGQUIT. Non-builtin |
4622 | * commands run by bash have signal handlers |
4623 | * set to the values inherited by the shell |
4624 | * from its parent". |
4625 | * Take care of the second rule: */ |
4626 | setsignal(SIGQUIT); |
4627 | } |
4628 | #if JOBS |
4629 | if (n && n->type == NCMD |
4630 | && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0 |
4631 | ) { |
4632 | TRACE(("Job hack\n")); |
4633 | /* "jobs": we do not want to clear job list for it, |
4634 | * instead we remove only _its_ own_ job from job list. |
4635 | * This makes "jobs .... | cat" more useful. |
4636 | */ |
4637 | freejob(curjob); |
4638 | return; |
4639 | } |
4640 | #endif |
4641 | for (jp = curjob; jp; jp = jp->prev_job) |
4642 | freejob(jp); |
4643 | jobless = 0; |
4644 | } |
4645 | |
4646 | /* Called after fork(), in parent */ |
4647 | #if !JOBS |
4648 | #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid) |
4649 | #endif |
4650 | static void |
4651 | forkparent(struct job *jp, union node *n, int mode, pid_t pid) |
4652 | { |
4653 | TRACE(("In parent shell: child = %d\n", pid)); |
4654 | if (!jp) { |
4655 | while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0) |
4656 | continue; |
4657 | jobless++; |
4658 | return; |
4659 | } |
4660 | #if JOBS |
4661 | if (mode != FORK_NOJOB && jp->jobctl) { |
4662 | int pgrp; |
4663 | |
4664 | if (jp->nprocs == 0) |
4665 | pgrp = pid; |
4666 | else |
4667 | pgrp = jp->ps[0].ps_pid; |
4668 | /* This can fail because we are doing it in the child also */ |
4669 | setpgid(pid, pgrp); |
4670 | } |
4671 | #endif |
4672 | if (mode == FORK_BG) { |
4673 | backgndpid = pid; /* set $! */ |
4674 | set_curjob(jp, CUR_RUNNING); |
4675 | } |
4676 | if (jp) { |
4677 | struct procstat *ps = &jp->ps[jp->nprocs++]; |
4678 | ps->ps_pid = pid; |
4679 | ps->ps_status = -1; |
4680 | ps->ps_cmd = nullstr; |
4681 | #if JOBS |
4682 | if (doing_jobctl && n) |
4683 | ps->ps_cmd = commandtext(n); |
4684 | #endif |
4685 | } |
4686 | } |
4687 | |
4688 | static int |
4689 | forkshell(struct job *jp, union node *n, int mode) |
4690 | { |
4691 | int pid; |
4692 | |
4693 | TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode)); |
4694 | pid = fork(); |
4695 | if (pid < 0) { |
4696 | TRACE(("Fork failed, errno=%d", errno)); |
4697 | if (jp) |
4698 | freejob(jp); |
4699 | ash_msg_and_raise_error("can't fork"); |
4700 | } |
4701 | if (pid == 0) { |
4702 | CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */ |
4703 | forkchild(jp, n, mode); |
4704 | } else { |
4705 | forkparent(jp, n, mode, pid); |
4706 | } |
4707 | return pid; |
4708 | } |
4709 | |
4710 | /* |
4711 | * Wait for job to finish. |
4712 | * |
4713 | * Under job control we have the problem that while a child process |
4714 | * is running interrupts generated by the user are sent to the child |
4715 | * but not to the shell. This means that an infinite loop started by |
4716 | * an interactive user may be hard to kill. With job control turned off, |
4717 | * an interactive user may place an interactive program inside a loop. |
4718 | * If the interactive program catches interrupts, the user doesn't want |
4719 | * these interrupts to also abort the loop. The approach we take here |
4720 | * is to have the shell ignore interrupt signals while waiting for a |
4721 | * foreground process to terminate, and then send itself an interrupt |
4722 | * signal if the child process was terminated by an interrupt signal. |
4723 | * Unfortunately, some programs want to do a bit of cleanup and then |
4724 | * exit on interrupt; unless these processes terminate themselves by |
4725 | * sending a signal to themselves (instead of calling exit) they will |
4726 | * confuse this approach. |
4727 | * |
4728 | * Called with interrupts off. |
4729 | */ |
4730 | static int |
4731 | waitforjob(struct job *jp) |
4732 | { |
4733 | int st; |
4734 | |
4735 | TRACE(("waitforjob(%%%d) called\n", jobno(jp))); |
4736 | |
4737 | INT_OFF; |
4738 | while (jp->state == JOBRUNNING) { |
4739 | /* In non-interactive shells, we _can_ get |
4740 | * a keyboard signal here and be EINTRed, |
4741 | * but we just loop back, waiting for command to complete. |
4742 | * |
4743 | * man bash: |
4744 | * "If bash is waiting for a command to complete and receives |
4745 | * a signal for which a trap has been set, the trap |
4746 | * will not be executed until the command completes." |
4747 | * |
4748 | * Reality is that even if trap is not set, bash |
4749 | * will not act on the signal until command completes. |
4750 | * Try this. sleep5intoff.c: |
4751 | * #include <signal.h> |
4752 | * #include <unistd.h> |
4753 | * int main() { |
4754 | * sigset_t set; |
4755 | * sigemptyset(&set); |
4756 | * sigaddset(&set, SIGINT); |
4757 | * sigaddset(&set, SIGQUIT); |
4758 | * sigprocmask(SIG_BLOCK, &set, NULL); |
4759 | * sleep(5); |
4760 | * return 0; |
4761 | * } |
4762 | * $ bash -c './sleep5intoff; echo hi' |
4763 | * ^C^C^C^C <--- pressing ^C once a second |
4764 | * $ _ |
4765 | * $ bash -c './sleep5intoff; echo hi' |
4766 | * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT) |
4767 | * $ _ |
4768 | */ |
4769 | dowait(DOWAIT_BLOCK, jp); |
4770 | } |
4771 | INT_ON; |
4772 | |
4773 | st = getstatus(jp); |
4774 | #if JOBS |
4775 | if (jp->jobctl) { |
4776 | xtcsetpgrp(ttyfd, rootpid); |
4777 | /* |
4778 | * This is truly gross. |
4779 | * If we're doing job control, then we did a TIOCSPGRP which |
4780 | * caused us (the shell) to no longer be in the controlling |
4781 | * session -- so we wouldn't have seen any ^C/SIGINT. So, we |
4782 | * intuit from the subprocess exit status whether a SIGINT |
4783 | * occurred, and if so interrupt ourselves. Yuck. - mycroft |
4784 | */ |
4785 | if (jp->sigint) /* TODO: do the same with all signals */ |
4786 | raise(SIGINT); /* ... by raise(jp->sig) instead? */ |
4787 | } |
4788 | if (jp->state == JOBDONE) |
4789 | #endif |
4790 | freejob(jp); |
4791 | return st; |
4792 | } |
4793 | |
4794 | /* |
4795 | * return 1 if there are stopped jobs, otherwise 0 |
4796 | */ |
4797 | static int |
4798 | stoppedjobs(void) |
4799 | { |
4800 | struct job *jp; |
4801 | int retval; |
4802 | |
4803 | retval = 0; |
4804 | if (job_warning) |
4805 | goto out; |
4806 | jp = curjob; |
4807 | if (jp && jp->state == JOBSTOPPED) { |
4808 | out2str("You have stopped jobs.\n"); |
4809 | job_warning = 2; |
4810 | retval++; |
4811 | } |
4812 | out: |
4813 | return retval; |
4814 | } |
4815 | |
4816 | |
4817 | /* ============ redir.c |
4818 | * |
4819 | * Code for dealing with input/output redirection. |
4820 | */ |
4821 | |
4822 | #define EMPTY -2 /* marks an unused slot in redirtab */ |
4823 | #define CLOSED -3 /* marks a slot of previously-closed fd */ |
4824 | |
4825 | /* |
4826 | * Open a file in noclobber mode. |
4827 | * The code was copied from bash. |
4828 | */ |
4829 | static int |
4830 | noclobberopen(const char *fname) |
4831 | { |
4832 | int r, fd; |
4833 | struct stat finfo, finfo2; |
4834 | |
4835 | /* |
4836 | * If the file exists and is a regular file, return an error |
4837 | * immediately. |
4838 | */ |
4839 | r = stat(fname, &finfo); |
4840 | if (r == 0 && S_ISREG(finfo.st_mode)) { |
4841 | errno = EEXIST; |
4842 | return -1; |
4843 | } |
4844 | |
4845 | /* |
4846 | * If the file was not present (r != 0), make sure we open it |
4847 | * exclusively so that if it is created before we open it, our open |
4848 | * will fail. Make sure that we do not truncate an existing file. |
4849 | * Note that we don't turn on O_EXCL unless the stat failed -- if the |
4850 | * file was not a regular file, we leave O_EXCL off. |
4851 | */ |
4852 | if (r != 0) |
4853 | return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666); |
4854 | fd = open(fname, O_WRONLY|O_CREAT, 0666); |
4855 | |
4856 | /* If the open failed, return the file descriptor right away. */ |
4857 | if (fd < 0) |
4858 | return fd; |
4859 | |
4860 | /* |
4861 | * OK, the open succeeded, but the file may have been changed from a |
4862 | * non-regular file to a regular file between the stat and the open. |
4863 | * We are assuming that the O_EXCL open handles the case where FILENAME |
4864 | * did not exist and is symlinked to an existing file between the stat |
4865 | * and open. |
4866 | */ |
4867 | |
4868 | /* |
4869 | * If we can open it and fstat the file descriptor, and neither check |
4870 | * revealed that it was a regular file, and the file has not been |
4871 | * replaced, return the file descriptor. |
4872 | */ |
4873 | if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode) |
4874 | && finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino) |
4875 | return fd; |
4876 | |
4877 | /* The file has been replaced. badness. */ |
4878 | close(fd); |
4879 | errno = EEXIST; |
4880 | return -1; |
4881 | } |
4882 | |
4883 | /* |
4884 | * Handle here documents. Normally we fork off a process to write the |
4885 | * data to a pipe. If the document is short, we can stuff the data in |
4886 | * the pipe without forking. |
4887 | */ |
4888 | /* openhere needs this forward reference */ |
4889 | static void expandhere(union node *arg, int fd); |
4890 | static int |
4891 | openhere(union node *redir) |
4892 | { |
4893 | int pip[2]; |
4894 | size_t len = 0; |
4895 | |
4896 | if (pipe(pip) < 0) |
4897 | ash_msg_and_raise_error("pipe call failed"); |
4898 | if (redir->type == NHERE) { |
4899 | len = strlen(redir->nhere.doc->narg.text); |
4900 | if (len <= PIPE_BUF) { |
4901 | full_write(pip[1], redir->nhere.doc->narg.text, len); |
4902 | goto out; |
4903 | } |
4904 | } |
4905 | if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) { |
4906 | /* child */ |
4907 | close(pip[0]); |
4908 | ignoresig(SIGINT); //signal(SIGINT, SIG_IGN); |
4909 | ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN); |
4910 | ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN); |
4911 | ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN); |
4912 | signal(SIGPIPE, SIG_DFL); |
4913 | if (redir->type == NHERE) |
4914 | full_write(pip[1], redir->nhere.doc->narg.text, len); |
4915 | else /* NXHERE */ |
4916 | expandhere(redir->nhere.doc, pip[1]); |
4917 | _exit(EXIT_SUCCESS); |
4918 | } |
4919 | out: |
4920 | close(pip[1]); |
4921 | return pip[0]; |
4922 | } |
4923 | |
4924 | static int |
4925 | openredirect(union node *redir) |
4926 | { |
4927 | char *fname; |
4928 | int f; |
4929 | |
4930 | switch (redir->nfile.type) { |
4931 | case NFROM: |
4932 | fname = redir->nfile.expfname; |
4933 | f = open(fname, O_RDONLY); |
4934 | if (f < 0) |
4935 | goto eopen; |
4936 | break; |
4937 | case NFROMTO: |
4938 | fname = redir->nfile.expfname; |
4939 | f = open(fname, O_RDWR|O_CREAT, 0666); |
4940 | if (f < 0) |
4941 | goto ecreate; |
4942 | break; |
4943 | case NTO: |
4944 | #if ENABLE_ASH_BASH_COMPAT |
4945 | case NTO2: |
4946 | #endif |
4947 | /* Take care of noclobber mode. */ |
4948 | if (Cflag) { |
4949 | fname = redir->nfile.expfname; |
4950 | f = noclobberopen(fname); |
4951 | if (f < 0) |
4952 | goto ecreate; |
4953 | break; |
4954 | } |
4955 | /* FALLTHROUGH */ |
4956 | case NCLOBBER: |
4957 | fname = redir->nfile.expfname; |
4958 | f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666); |
4959 | if (f < 0) |
4960 | goto ecreate; |
4961 | break; |
4962 | case NAPPEND: |
4963 | fname = redir->nfile.expfname; |
4964 | f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666); |
4965 | if (f < 0) |
4966 | goto ecreate; |
4967 | break; |
4968 | default: |
4969 | #if DEBUG |
4970 | abort(); |
4971 | #endif |
4972 | /* Fall through to eliminate warning. */ |
4973 | /* Our single caller does this itself */ |
4974 | // case NTOFD: |
4975 | // case NFROMFD: |
4976 | // f = -1; |
4977 | // break; |
4978 | case NHERE: |
4979 | case NXHERE: |
4980 | f = openhere(redir); |
4981 | break; |
4982 | } |
4983 | |
4984 | return f; |
4985 | ecreate: |
4986 | ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory")); |
4987 | eopen: |
4988 | ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file")); |
4989 | } |
4990 | |
4991 | /* |
4992 | * Copy a file descriptor to be >= to. Returns -1 |
4993 | * if the source file descriptor is closed, EMPTY if there are no unused |
4994 | * file descriptors left. |
4995 | */ |
4996 | /* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD). |
4997 | * old code was doing close(to) prior to copyfd() to achieve the same */ |
4998 | enum { |
4999 | COPYFD_EXACT = (int)~(INT_MAX), |
5000 | COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1), |
5001 | }; |
5002 | static int |
5003 | copyfd(int from, int to) |
5004 | { |
5005 | int newfd; |
5006 | |
5007 | if (to & COPYFD_EXACT) { |
5008 | to &= ~COPYFD_EXACT; |
5009 | /*if (from != to)*/ |
5010 | newfd = dup2(from, to); |
5011 | } else { |
5012 | newfd = fcntl(from, F_DUPFD, to); |
5013 | } |
5014 | if (newfd < 0) { |
5015 | if (errno == EMFILE) |
5016 | return EMPTY; |
5017 | /* Happens when source fd is not open: try "echo >&99" */ |
5018 | ash_msg_and_raise_error("%d: %m", from); |
5019 | } |
5020 | return newfd; |
5021 | } |
5022 | |
5023 | /* Struct def and variable are moved down to the first usage site */ |
5024 | struct two_fd_t { |
5025 | int orig, copy; |
5026 | }; |
5027 | struct redirtab { |
5028 | struct redirtab *next; |
5029 | int nullredirs; |
5030 | int pair_count; |
5031 | struct two_fd_t two_fd[]; |
5032 | }; |
5033 | #define redirlist (G_var.redirlist) |
5034 | |
5035 | static int need_to_remember(struct redirtab *rp, int fd) |
5036 | { |
5037 | int i; |
5038 | |
5039 | if (!rp) /* remembering was not requested */ |
5040 | return 0; |
5041 | |
5042 | for (i = 0; i < rp->pair_count; i++) { |
5043 | if (rp->two_fd[i].orig == fd) { |
5044 | /* already remembered */ |
5045 | return 0; |
5046 | } |
5047 | } |
5048 | return 1; |
5049 | } |
5050 | |
5051 | /* "hidden" fd is a fd used to read scripts, or a copy of such */ |
5052 | static int is_hidden_fd(struct redirtab *rp, int fd) |
5053 | { |
5054 | int i; |
5055 | struct parsefile *pf; |
5056 | |
5057 | if (fd == -1) |
5058 | return 0; |
5059 | /* Check open scripts' fds */ |
5060 | pf = g_parsefile; |
5061 | while (pf) { |
5062 | /* We skip pf_fd == 0 case because of the following case: |
5063 | * $ ash # running ash interactively |
5064 | * $ . ./script.sh |
5065 | * and in script.sh: "exec 9>&0". |
5066 | * Even though top-level pf_fd _is_ 0, |
5067 | * it's still ok to use it: "read" builtin uses it, |
5068 | * why should we cripple "exec" builtin? |
5069 | */ |
5070 | if (pf->pf_fd > 0 && fd == pf->pf_fd) { |
5071 | return 1; |
5072 | } |
5073 | pf = pf->prev; |
5074 | } |
5075 | |
5076 | if (!rp) |
5077 | return 0; |
5078 | /* Check saved fds of redirects */ |
5079 | fd |= COPYFD_RESTORE; |
5080 | for (i = 0; i < rp->pair_count; i++) { |
5081 | if (rp->two_fd[i].copy == fd) { |
5082 | return 1; |
5083 | } |
5084 | } |
5085 | return 0; |
5086 | } |
5087 | |
5088 | /* |
5089 | * Process a list of redirection commands. If the REDIR_PUSH flag is set, |
5090 | * old file descriptors are stashed away so that the redirection can be |
5091 | * undone by calling popredir. |
5092 | */ |
5093 | /* flags passed to redirect */ |
5094 | #define REDIR_PUSH 01 /* save previous values of file descriptors */ |
5095 | #define REDIR_SAVEFD2 03 /* set preverrout */ |
5096 | static void |
5097 | redirect(union node *redir, int flags) |
5098 | { |
5099 | struct redirtab *sv; |
5100 | int sv_pos; |
5101 | int i; |
5102 | int fd; |
5103 | int newfd; |
5104 | int copied_fd2 = -1; |
5105 | |
5106 | g_nullredirs++; |
5107 | if (!redir) { |
5108 | return; |
5109 | } |
5110 | |
5111 | sv = NULL; |
5112 | sv_pos = 0; |
5113 | INT_OFF; |
5114 | if (flags & REDIR_PUSH) { |
5115 | union node *tmp = redir; |
5116 | do { |
5117 | sv_pos++; |
5118 | #if ENABLE_ASH_BASH_COMPAT |
5119 | if (tmp->nfile.type == NTO2) |
5120 | sv_pos++; |
5121 | #endif |
5122 | tmp = tmp->nfile.next; |
5123 | } while (tmp); |
5124 | sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0])); |
5125 | sv->next = redirlist; |
5126 | sv->pair_count = sv_pos; |
5127 | redirlist = sv; |
5128 | sv->nullredirs = g_nullredirs - 1; |
5129 | g_nullredirs = 0; |
5130 | while (sv_pos > 0) { |
5131 | sv_pos--; |
5132 | sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY; |
5133 | } |
5134 | } |
5135 | |
5136 | do { |
5137 | int right_fd = -1; |
5138 | fd = redir->nfile.fd; |
5139 | if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) { |
5140 | right_fd = redir->ndup.dupfd; |
5141 | //bb_error_msg("doing %d > %d", fd, right_fd); |
5142 | /* redirect from/to same file descriptor? */ |
5143 | if (right_fd == fd) |
5144 | continue; |
5145 | /* "echo >&10" and 10 is a fd opened to a sh script? */ |
5146 | if (is_hidden_fd(sv, right_fd)) { |
5147 | errno = EBADF; /* as if it is closed */ |
5148 | ash_msg_and_raise_error("%d: %m", right_fd); |
5149 | } |
5150 | newfd = -1; |
5151 | } else { |
5152 | newfd = openredirect(redir); /* always >= 0 */ |
5153 | if (fd == newfd) { |
5154 | /* Descriptor wasn't open before redirect. |
5155 | * Mark it for close in the future */ |
5156 | if (need_to_remember(sv, fd)) { |
5157 | goto remember_to_close; |
5158 | } |
5159 | continue; |
5160 | } |
5161 | } |
5162 | #if ENABLE_ASH_BASH_COMPAT |
5163 | redirect_more: |
5164 | #endif |
5165 | if (need_to_remember(sv, fd)) { |
5166 | /* Copy old descriptor */ |
5167 | /* Careful to not accidentally "save" |
5168 | * to the same fd as right side fd in N>&M */ |
5169 | int minfd = right_fd < 10 ? 10 : right_fd + 1; |
5170 | i = fcntl(fd, F_DUPFD, minfd); |
5171 | /* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds |
5172 | * are closed in popredir() in the child, preventing them from leaking |
5173 | * into child. (popredir() also cleans up the mess in case of failures) |
5174 | */ |
5175 | if (i == -1) { |
5176 | i = errno; |
5177 | if (i != EBADF) { |
5178 | /* Strange error (e.g. "too many files" EMFILE?) */ |
5179 | if (newfd >= 0) |
5180 | close(newfd); |
5181 | errno = i; |
5182 | ash_msg_and_raise_error("%d: %m", fd); |
5183 | /* NOTREACHED */ |
5184 | } |
5185 | /* EBADF: it is not open - good, remember to close it */ |
5186 | remember_to_close: |
5187 | i = CLOSED; |
5188 | } else { /* fd is open, save its copy */ |
5189 | /* "exec fd>&-" should not close fds |
5190 | * which point to script file(s). |
5191 | * Force them to be restored afterwards */ |
5192 | if (is_hidden_fd(sv, fd)) |
5193 | i |= COPYFD_RESTORE; |
5194 | } |
5195 | if (fd == 2) |
5196 | copied_fd2 = i; |
5197 | sv->two_fd[sv_pos].orig = fd; |
5198 | sv->two_fd[sv_pos].copy = i; |
5199 | sv_pos++; |
5200 | } |
5201 | if (newfd < 0) { |
5202 | /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */ |
5203 | if (redir->ndup.dupfd < 0) { /* "fd>&-" */ |
5204 | /* Don't want to trigger debugging */ |
5205 | if (fd != -1) |
5206 | close(fd); |
5207 | } else { |
5208 | copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT); |
5209 | } |
5210 | } else if (fd != newfd) { /* move newfd to fd */ |
5211 | copyfd(newfd, fd | COPYFD_EXACT); |
5212 | #if ENABLE_ASH_BASH_COMPAT |
5213 | if (!(redir->nfile.type == NTO2 && fd == 2)) |
5214 | #endif |
5215 | close(newfd); |
5216 | } |
5217 | #if ENABLE_ASH_BASH_COMPAT |
5218 | if (redir->nfile.type == NTO2 && fd == 1) { |
5219 | /* We already redirected it to fd 1, now copy it to 2 */ |
5220 | newfd = 1; |
5221 | fd = 2; |
5222 | goto redirect_more; |
5223 | } |
5224 | #endif |
5225 | } while ((redir = redir->nfile.next) != NULL); |
5226 | |
5227 | INT_ON; |
5228 | if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0) |
5229 | preverrout_fd = copied_fd2; |
5230 | } |
5231 | |
5232 | /* |
5233 | * Undo the effects of the last redirection. |
5234 | */ |
5235 | static void |
5236 | popredir(int drop, int restore) |
5237 | { |
5238 | struct redirtab *rp; |
5239 | int i; |
5240 | |
5241 | if (--g_nullredirs >= 0) |
5242 | return; |
5243 | INT_OFF; |
5244 | rp = redirlist; |
5245 | for (i = 0; i < rp->pair_count; i++) { |
5246 | int fd = rp->two_fd[i].orig; |
5247 | int copy = rp->two_fd[i].copy; |
5248 | if (copy == CLOSED) { |
5249 | if (!drop) |
5250 | close(fd); |
5251 | continue; |
5252 | } |
5253 | if (copy != EMPTY) { |
5254 | if (!drop || (restore && (copy & COPYFD_RESTORE))) { |
5255 | copy &= ~COPYFD_RESTORE; |
5256 | /*close(fd);*/ |
5257 | copyfd(copy, fd | COPYFD_EXACT); |
5258 | } |
5259 | close(copy & ~COPYFD_RESTORE); |
5260 | } |
5261 | } |
5262 | redirlist = rp->next; |
5263 | g_nullredirs = rp->nullredirs; |
5264 | free(rp); |
5265 | INT_ON; |
5266 | } |
5267 | |
5268 | /* |
5269 | * Undo all redirections. Called on error or interrupt. |
5270 | */ |
5271 | |
5272 | /* |
5273 | * Discard all saved file descriptors. |
5274 | */ |
5275 | static void |
5276 | clearredir(int drop) |
5277 | { |
5278 | for (;;) { |
5279 | g_nullredirs = 0; |
5280 | if (!redirlist) |
5281 | break; |
5282 | popredir(drop, /*restore:*/ 0); |
5283 | } |
5284 | } |
5285 | |
5286 | static int |
5287 | redirectsafe(union node *redir, int flags) |
5288 | { |
5289 | int err; |
5290 | volatile int saveint; |
5291 | struct jmploc *volatile savehandler = exception_handler; |
5292 | struct jmploc jmploc; |
5293 | |
5294 | SAVE_INT(saveint); |
5295 | /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */ |
5296 | err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2; |
5297 | if (!err) { |
5298 | exception_handler = &jmploc; |
5299 | redirect(redir, flags); |
5300 | } |
5301 | exception_handler = savehandler; |
5302 | if (err && exception_type != EXERROR) |
5303 | longjmp(exception_handler->loc, 1); |
5304 | RESTORE_INT(saveint); |
5305 | return err; |
5306 | } |
5307 | |
5308 | |
5309 | /* ============ Routines to expand arguments to commands |
5310 | * |
5311 | * We have to deal with backquotes, shell variables, and file metacharacters. |
5312 | */ |
5313 | |
5314 | #if ENABLE_SH_MATH_SUPPORT |
5315 | static arith_t |
5316 | ash_arith(const char *s) |
5317 | { |
5318 | arith_eval_hooks_t math_hooks; |
5319 | arith_t result; |
5320 | int errcode = 0; |
5321 | |
5322 | math_hooks.lookupvar = lookupvar; |
5323 | math_hooks.setvar = setvar2; |
5324 | math_hooks.endofname = endofname; |
5325 | |
5326 | INT_OFF; |
5327 | result = arith(s, &errcode, &math_hooks); |
5328 | if (errcode < 0) { |
5329 | if (errcode == -3) |
5330 | ash_msg_and_raise_error("exponent less than 0"); |
5331 | if (errcode == -2) |
5332 | ash_msg_and_raise_error("divide by zero"); |
5333 | if (errcode == -5) |
5334 | ash_msg_and_raise_error("expression recursion loop detected"); |
5335 | raise_error_syntax(s); |
5336 | } |
5337 | INT_ON; |
5338 | |
5339 | return result; |
5340 | } |
5341 | #endif |
5342 | |
5343 | /* |
5344 | * expandarg flags |
5345 | */ |
5346 | #define EXP_FULL 0x1 /* perform word splitting & file globbing */ |
5347 | #define EXP_TILDE 0x2 /* do normal tilde expansion */ |
5348 | #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */ |
5349 | #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */ |
5350 | #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */ |
5351 | #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */ |
5352 | #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */ |
5353 | #define EXP_WORD 0x80 /* expand word in parameter expansion */ |
5354 | #define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */ |
5355 | /* |
5356 | * rmescape() flags |
5357 | */ |
5358 | #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */ |
5359 | #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */ |
5360 | #define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */ |
5361 | #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */ |
5362 | #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */ |
5363 | |
5364 | /* |
5365 | * Structure specifying which parts of the string should be searched |
5366 | * for IFS characters. |
5367 | */ |
5368 | struct ifsregion { |
5369 | struct ifsregion *next; /* next region in list */ |
5370 | int begoff; /* offset of start of region */ |
5371 | int endoff; /* offset of end of region */ |
5372 | int nulonly; /* search for nul bytes only */ |
5373 | }; |
5374 | |
5375 | struct arglist { |
5376 | struct strlist *list; |
5377 | struct strlist **lastp; |
5378 | }; |
5379 | |
5380 | /* output of current string */ |
5381 | static char *expdest; |
5382 | /* list of back quote expressions */ |
5383 | static struct nodelist *argbackq; |
5384 | /* first struct in list of ifs regions */ |
5385 | static struct ifsregion ifsfirst; |
5386 | /* last struct in list */ |
5387 | static struct ifsregion *ifslastp; |
5388 | /* holds expanded arg list */ |
5389 | static struct arglist exparg; |
5390 | |
5391 | /* |
5392 | * Our own itoa(). |
5393 | */ |
5394 | static int |
5395 | cvtnum(arith_t num) |
5396 | { |
5397 | int len; |
5398 | |
5399 | expdest = makestrspace(32, expdest); |
5400 | len = fmtstr(expdest, 32, arith_t_fmt, num); |
5401 | STADJUST(len, expdest); |
5402 | return len; |
5403 | } |
5404 | |
5405 | static size_t |
5406 | esclen(const char *start, const char *p) |
5407 | { |
5408 | size_t esc = 0; |
5409 | |
5410 | while (p > start && (unsigned char)*--p == CTLESC) { |
5411 | esc++; |
5412 | } |
5413 | return esc; |
5414 | } |
5415 | |
5416 | /* |
5417 | * Remove any CTLESC characters from a string. |
5418 | */ |
5419 | static char * |
5420 | rmescapes(char *str, int flag) |
5421 | { |
5422 | static const char qchars[] ALIGN1 = { CTLESC, CTLQUOTEMARK, '\0' }; |
5423 | |
5424 | char *p, *q, *r; |
5425 | unsigned inquotes; |
5426 | unsigned protect_against_glob; |
5427 | unsigned globbing; |
5428 | |
5429 | p = strpbrk(str, qchars); |
5430 | if (!p) |
5431 | return str; |
5432 | |
5433 | q = p; |
5434 | r = str; |
5435 | if (flag & RMESCAPE_ALLOC) { |
5436 | size_t len = p - str; |
5437 | size_t fulllen = len + strlen(p) + 1; |
5438 | |
5439 | if (flag & RMESCAPE_GROW) { |
5440 | int strloc = str - (char *)stackblock(); |
5441 | r = makestrspace(fulllen, expdest); |
5442 | /* p and str may be invalidated by makestrspace */ |
5443 | str = (char *)stackblock() + strloc; |
5444 | p = str + len; |
5445 | } else if (flag & RMESCAPE_HEAP) { |
5446 | r = ckmalloc(fulllen); |
5447 | } else { |
5448 | r = stalloc(fulllen); |
5449 | } |
5450 | q = r; |
5451 | if (len > 0) { |
5452 | q = (char *)memcpy(q, str, len) + len; |
5453 | } |
5454 | } |
5455 | |
5456 | inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED; |
5457 | globbing = flag & RMESCAPE_GLOB; |
5458 | protect_against_glob = globbing; |
5459 | while (*p) { |
5460 | if ((unsigned char)*p == CTLQUOTEMARK) { |
5461 | // TODO: if no RMESCAPE_QUOTED in flags, inquotes never becomes 0 |
5462 | // (alternates between RMESCAPE_QUOTED and ~RMESCAPE_QUOTED). Is it ok? |
5463 | // Note: both inquotes and protect_against_glob only affect whether |
5464 | // CTLESC,<ch> gets converted to <ch> or to \<ch> |
5465 | inquotes = ~inquotes; |
5466 | p++; |
5467 | protect_against_glob = globbing; |
5468 | continue; |
5469 | } |
5470 | if (*p == '\\') { |
5471 | /* naked back slash */ |
5472 | protect_against_glob = 0; |
5473 | goto copy; |
5474 | } |
5475 | if ((unsigned char)*p == CTLESC) { |
5476 | p++; |
5477 | if (protect_against_glob && inquotes && *p != '/') { |
5478 | *q++ = '\\'; |
5479 | } |
5480 | } |
5481 | protect_against_glob = globbing; |
5482 | copy: |
5483 | *q++ = *p++; |
5484 | } |
5485 | *q = '\0'; |
5486 | if (flag & RMESCAPE_GROW) { |
5487 | expdest = r; |
5488 | STADJUST(q - r + 1, expdest); |
5489 | } |
5490 | return r; |
5491 | } |
5492 | #define pmatch(a, b) !fnmatch((a), (b), 0) |
5493 | |
5494 | /* |
5495 | * Prepare a pattern for a expmeta (internal glob(3)) call. |
5496 | * |
5497 | * Returns an stalloced string. |
5498 | */ |
5499 | static char * |
5500 | preglob(const char *pattern, int quoted, int flag) |
5501 | { |
5502 | flag |= RMESCAPE_GLOB; |
5503 | if (quoted) { |
5504 | flag |= RMESCAPE_QUOTED; |
5505 | } |
5506 | return rmescapes((char *)pattern, flag); |
5507 | } |
5508 | |
5509 | /* |
5510 | * Put a string on the stack. |
5511 | */ |
5512 | static void |
5513 | memtodest(const char *p, size_t len, int syntax, int quotes) |
5514 | { |
5515 | char *q = expdest; |
5516 | |
5517 | q = makestrspace(quotes ? len * 2 : len, q); |
5518 | |
5519 | while (len--) { |
5520 | unsigned char c = *p++; |
5521 | if (c == '\0') |
5522 | continue; |
5523 | if (quotes) { |
5524 | int n = SIT(c, syntax); |
5525 | if (n == CCTL || n == CBACK) |
5526 | USTPUTC(CTLESC, q); |
5527 | } |
5528 | USTPUTC(c, q); |
5529 | } |
5530 | |
5531 | expdest = q; |
5532 | } |
5533 | |
5534 | static void |
5535 | strtodest(const char *p, int syntax, int quotes) |
5536 | { |
5537 | memtodest(p, strlen(p), syntax, quotes); |
5538 | } |
5539 | |
5540 | /* |
5541 | * Record the fact that we have to scan this region of the |
5542 | * string for IFS characters. |
5543 | */ |
5544 | static void |
5545 | recordregion(int start, int end, int nulonly) |
5546 | { |
5547 | struct ifsregion *ifsp; |
5548 | |
5549 | if (ifslastp == NULL) { |
5550 | ifsp = &ifsfirst; |
5551 | } else { |
5552 | INT_OFF; |
5553 | ifsp = ckzalloc(sizeof(*ifsp)); |
5554 | /*ifsp->next = NULL; - ckzalloc did it */ |
5555 | ifslastp->next = ifsp; |
5556 | INT_ON; |
5557 | } |
5558 | ifslastp = ifsp; |
5559 | ifslastp->begoff = start; |
5560 | ifslastp->endoff = end; |
5561 | ifslastp->nulonly = nulonly; |
5562 | } |
5563 | |
5564 | static void |
5565 | removerecordregions(int endoff) |
5566 | { |
5567 | if (ifslastp == NULL) |
5568 | return; |
5569 | |
5570 | if (ifsfirst.endoff > endoff) { |
5571 | while (ifsfirst.next != NULL) { |
5572 | struct ifsregion *ifsp; |
5573 | INT_OFF; |
5574 | ifsp = ifsfirst.next->next; |
5575 | free(ifsfirst.next); |
5576 | ifsfirst.next = ifsp; |
5577 | INT_ON; |
5578 | } |
5579 | if (ifsfirst.begoff > endoff) |
5580 | ifslastp = NULL; |
5581 | else { |
5582 | ifslastp = &ifsfirst; |
5583 | ifsfirst.endoff = endoff; |
5584 | } |
5585 | return; |
5586 | } |
5587 | |
5588 | ifslastp = &ifsfirst; |
5589 | while (ifslastp->next && ifslastp->next->begoff < endoff) |
5590 | ifslastp=ifslastp->next; |
5591 | while (ifslastp->next != NULL) { |
5592 | struct ifsregion *ifsp; |
5593 | INT_OFF; |
5594 | ifsp = ifslastp->next->next; |
5595 | free(ifslastp->next); |
5596 | ifslastp->next = ifsp; |
5597 | INT_ON; |
5598 | } |
5599 | if (ifslastp->endoff > endoff) |
5600 | ifslastp->endoff = endoff; |
5601 | } |
5602 | |
5603 | static char * |
5604 | exptilde(char *startp, char *p, int flags) |
5605 | { |
5606 | unsigned char c; |
5607 | char *name; |
5608 | struct passwd *pw; |
5609 | const char *home; |
5610 | int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR); |
5611 | int startloc; |
5612 | |
5613 | name = p + 1; |
5614 | |
5615 | while ((c = *++p) != '\0') { |
5616 | switch (c) { |
5617 | case CTLESC: |
5618 | return startp; |
5619 | case CTLQUOTEMARK: |
5620 | return startp; |
5621 | case ':': |
5622 | if (flags & EXP_VARTILDE) |
5623 | goto done; |
5624 | break; |
5625 | case '/': |
5626 | case CTLENDVAR: |
5627 | goto done; |
5628 | } |
5629 | } |
5630 | done: |
5631 | *p = '\0'; |
5632 | if (*name == '\0') { |
5633 | home = lookupvar("HOME"); |
5634 | } else { |
5635 | pw = getpwnam(name); |
5636 | if (pw == NULL) |
5637 | goto lose; |
5638 | home = pw->pw_dir; |
5639 | } |
5640 | if (!home || !*home) |
5641 | goto lose; |
5642 | *p = c; |
5643 | startloc = expdest - (char *)stackblock(); |
5644 | strtodest(home, SQSYNTAX, quotes); |
5645 | recordregion(startloc, expdest - (char *)stackblock(), 0); |
5646 | return p; |
5647 | lose: |
5648 | *p = c; |
5649 | return startp; |
5650 | } |
5651 | |
5652 | /* |
5653 | * Execute a command inside back quotes. If it's a builtin command, we |
5654 | * want to save its output in a block obtained from malloc. Otherwise |
5655 | * we fork off a subprocess and get the output of the command via a pipe. |
5656 | * Should be called with interrupts off. |
5657 | */ |
5658 | struct backcmd { /* result of evalbackcmd */ |
5659 | int fd; /* file descriptor to read from */ |
5660 | int nleft; /* number of chars in buffer */ |
5661 | char *buf; /* buffer */ |
5662 | struct job *jp; /* job structure for command */ |
5663 | }; |
5664 | |
5665 | /* These forward decls are needed to use "eval" code for backticks handling: */ |
5666 | static uint8_t back_exitstatus; /* exit status of backquoted command */ |
5667 | #define EV_EXIT 01 /* exit after evaluating tree */ |
5668 | static void evaltree(union node *, int); |
5669 | |
5670 | static void FAST_FUNC |
5671 | evalbackcmd(union node *n, struct backcmd *result) |
5672 | { |
5673 | int saveherefd; |
5674 | |
5675 | result->fd = -1; |
5676 | result->buf = NULL; |
5677 | result->nleft = 0; |
5678 | result->jp = NULL; |
5679 | if (n == NULL) |
5680 | goto out; |
5681 | |
5682 | saveherefd = herefd; |
5683 | herefd = -1; |
5684 | |
5685 | { |
5686 | int pip[2]; |
5687 | struct job *jp; |
5688 | |
5689 | if (pipe(pip) < 0) |
5690 | ash_msg_and_raise_error("pipe call failed"); |
5691 | jp = makejob(/*n,*/ 1); |
5692 | if (forkshell(jp, n, FORK_NOJOB) == 0) { |
5693 | FORCE_INT_ON; |
5694 | close(pip[0]); |
5695 | if (pip[1] != 1) { |
5696 | /*close(1);*/ |
5697 | copyfd(pip[1], 1 | COPYFD_EXACT); |
5698 | close(pip[1]); |
5699 | } |
5700 | eflag = 0; |
5701 | evaltree(n, EV_EXIT); /* actually evaltreenr... */ |
5702 | /* NOTREACHED */ |
5703 | } |
5704 | close(pip[1]); |
5705 | result->fd = pip[0]; |
5706 | result->jp = jp; |
5707 | } |
5708 | herefd = saveherefd; |
5709 | out: |
5710 | TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n", |
5711 | result->fd, result->buf, result->nleft, result->jp)); |
5712 | } |
5713 | |
5714 | /* |
5715 | * Expand stuff in backwards quotes. |
5716 | */ |
5717 | static void |
5718 | expbackq(union node *cmd, int quoted, int quotes) |
5719 | { |
5720 | struct backcmd in; |
5721 | int i; |
5722 | char buf[128]; |
5723 | char *p; |
5724 | char *dest; |
5725 | int startloc; |
5726 | int syntax = quoted ? DQSYNTAX : BASESYNTAX; |
5727 | struct stackmark smark; |
5728 | |
5729 | INT_OFF; |
5730 | setstackmark(&smark); |
5731 | dest = expdest; |
5732 | startloc = dest - (char *)stackblock(); |
5733 | grabstackstr(dest); |
5734 | evalbackcmd(cmd, &in); |
5735 | popstackmark(&smark); |
5736 | |
5737 | p = in.buf; |
5738 | i = in.nleft; |
5739 | if (i == 0) |
5740 | goto read; |
5741 | for (;;) { |
5742 | memtodest(p, i, syntax, quotes); |
5743 | read: |
5744 | if (in.fd < 0) |
5745 | break; |
5746 | i = nonblock_safe_read(in.fd, buf, sizeof(buf)); |
5747 | TRACE(("expbackq: read returns %d\n", i)); |
5748 | if (i <= 0) |
5749 | break; |
5750 | p = buf; |
5751 | } |
5752 | |
5753 | free(in.buf); |
5754 | if (in.fd >= 0) { |
5755 | close(in.fd); |
5756 | back_exitstatus = waitforjob(in.jp); |
5757 | } |
5758 | INT_ON; |
5759 | |
5760 | /* Eat all trailing newlines */ |
5761 | dest = expdest; |
5762 | for (; dest > (char *)stackblock() && dest[-1] == '\n';) |
5763 | STUNPUTC(dest); |
5764 | expdest = dest; |
5765 | |
5766 | if (quoted == 0) |
5767 | recordregion(startloc, dest - (char *)stackblock(), 0); |
5768 | TRACE(("evalbackq: size=%d: \"%.*s\"\n", |
5769 | (dest - (char *)stackblock()) - startloc, |
5770 | (dest - (char *)stackblock()) - startloc, |
5771 | stackblock() + startloc)); |
5772 | } |
5773 | |
5774 | #if ENABLE_SH_MATH_SUPPORT |
5775 | /* |
5776 | * Expand arithmetic expression. Backup to start of expression, |
5777 | * evaluate, place result in (backed up) result, adjust string position. |
5778 | */ |
5779 | static void |
5780 | expari(int quotes) |
5781 | { |
5782 | char *p, *start; |
5783 | int begoff; |
5784 | int flag; |
5785 | int len; |
5786 | |
5787 | /* ifsfree(); */ |
5788 | |
5789 | /* |
5790 | * This routine is slightly over-complicated for |
5791 | * efficiency. Next we scan backwards looking for the |
5792 | * start of arithmetic. |
5793 | */ |
5794 | start = stackblock(); |
5795 | p = expdest - 1; |
5796 | *p = '\0'; |
5797 | p--; |
5798 | do { |
5799 | int esc; |
5800 | |
5801 | while ((unsigned char)*p != CTLARI) { |
5802 | p--; |
5803 | #if DEBUG |
5804 | if (p < start) { |
5805 | ash_msg_and_raise_error("missing CTLARI (shouldn't happen)"); |
5806 | } |
5807 | #endif |
5808 | } |
5809 | |
5810 | esc = esclen(start, p); |
5811 | if (!(esc % 2)) { |
5812 | break; |
5813 | } |
5814 | |
5815 | p -= esc + 1; |
5816 | } while (1); |
5817 | |
5818 | begoff = p - start; |
5819 | |
5820 | removerecordregions(begoff); |
5821 | |
5822 | flag = p[1]; |
5823 | |
5824 | expdest = p; |
5825 | |
5826 | if (quotes) |
5827 | rmescapes(p + 2, 0); |
5828 | |
5829 | len = cvtnum(ash_arith(p + 2)); |
5830 | |
5831 | if (flag != '"') |
5832 | recordregion(begoff, begoff + len, 0); |
5833 | } |
5834 | #endif |
5835 | |
5836 | /* argstr needs it */ |
5837 | static char *evalvar(char *p, int flags, struct strlist *var_str_list); |
5838 | |
5839 | /* |
5840 | * Perform variable and command substitution. If EXP_FULL is set, output CTLESC |
5841 | * characters to allow for further processing. Otherwise treat |
5842 | * $@ like $* since no splitting will be performed. |
5843 | * |
5844 | * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence |
5845 | * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it |
5846 | * for correct expansion of "B=$A" word. |
5847 | */ |
5848 | static void |
5849 | argstr(char *p, int flags, struct strlist *var_str_list) |
5850 | { |
5851 | static const char spclchars[] ALIGN1 = { |
5852 | '=', |
5853 | ':', |
5854 | CTLQUOTEMARK, |
5855 | CTLENDVAR, |
5856 | CTLESC, |
5857 | CTLVAR, |
5858 | CTLBACKQ, |
5859 | CTLBACKQ | CTLQUOTE, |
5860 | #if ENABLE_SH_MATH_SUPPORT |
5861 | CTLENDARI, |
5862 | #endif |
5863 | '\0' |
5864 | }; |
5865 | const char *reject = spclchars; |
5866 | int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */ |
5867 | int breakall = flags & EXP_WORD; |
5868 | int inquotes; |
5869 | size_t length; |
5870 | int startloc; |
5871 | |
5872 | if (!(flags & EXP_VARTILDE)) { |
5873 | reject += 2; |
5874 | } else if (flags & EXP_VARTILDE2) { |
5875 | reject++; |
5876 | } |
5877 | inquotes = 0; |
5878 | length = 0; |
5879 | if (flags & EXP_TILDE) { |
5880 | char *q; |
5881 | |
5882 | flags &= ~EXP_TILDE; |
5883 | tilde: |
5884 | q = p; |
5885 | if (*q == CTLESC && (flags & EXP_QWORD)) |
5886 | q++; |
5887 | if (*q == '~') |
5888 | p = exptilde(p, q, flags); |
5889 | } |
5890 | start: |
5891 | startloc = expdest - (char *)stackblock(); |
5892 | for (;;) { |
5893 | unsigned char c; |
5894 | |
5895 | length += strcspn(p + length, reject); |
5896 | c = p[length]; |
5897 | if (c) { |
5898 | if (!(c & 0x80) |
5899 | #if ENABLE_SH_MATH_SUPPORT |
5900 | || c == CTLENDARI |
5901 | #endif |
5902 | ) { |
5903 | /* c == '=' || c == ':' || c == CTLENDARI */ |
5904 | length++; |
5905 | } |
5906 | } |
5907 | if (length > 0) { |
5908 | int newloc; |
5909 | expdest = stack_nputstr(p, length, expdest); |
5910 | newloc = expdest - (char *)stackblock(); |
5911 | if (breakall && !inquotes && newloc > startloc) { |
5912 | recordregion(startloc, newloc, 0); |
5913 | } |
5914 | startloc = newloc; |
5915 | } |
5916 | p += length + 1; |
5917 | length = 0; |
5918 | |
5919 | switch (c) { |
5920 | case '\0': |
5921 | goto breakloop; |
5922 | case '=': |
5923 | if (flags & EXP_VARTILDE2) { |
5924 | p--; |
5925 | continue; |
5926 | } |
5927 | flags |= EXP_VARTILDE2; |
5928 | reject++; |
5929 | /* fall through */ |
5930 | case ':': |
5931 | /* |
5932 | * sort of a hack - expand tildes in variable |
5933 | * assignments (after the first '=' and after ':'s). |
5934 | */ |
5935 | if (*--p == '~') { |
5936 | goto tilde; |
5937 | } |
5938 | continue; |
5939 | } |
5940 | |
5941 | switch (c) { |
5942 | case CTLENDVAR: /* ??? */ |
5943 | goto breakloop; |
5944 | case CTLQUOTEMARK: |
5945 | /* "$@" syntax adherence hack */ |
5946 | if (!inquotes |
5947 | && memcmp(p, dolatstr, 4) == 0 |
5948 | && ( p[4] == CTLQUOTEMARK |
5949 | || (p[4] == CTLENDVAR && p[5] == CTLQUOTEMARK) |
5950 | ) |
5951 | ) { |
5952 | p = evalvar(p + 1, flags, /* var_str_list: */ NULL) + 1; |
5953 | goto start; |
5954 | } |
5955 | inquotes = !inquotes; |
5956 | addquote: |
5957 | if (quotes) { |
5958 | p--; |
5959 | length++; |
5960 | startloc++; |
5961 | } |
5962 | break; |
5963 | case CTLESC: |
5964 | startloc++; |
5965 | length++; |
5966 | goto addquote; |
5967 | case CTLVAR: |
5968 | p = evalvar(p, flags, var_str_list); |
5969 | goto start; |
5970 | case CTLBACKQ: |
5971 | c = '\0'; |
5972 | case CTLBACKQ|CTLQUOTE: |
5973 | expbackq(argbackq->n, c, quotes); |
5974 | argbackq = argbackq->next; |
5975 | goto start; |
5976 | #if ENABLE_SH_MATH_SUPPORT |
5977 | case CTLENDARI: |
5978 | p--; |
5979 | expari(quotes); |
5980 | goto start; |
5981 | #endif |
5982 | } |
5983 | } |
5984 | breakloop: |
5985 | ; |
5986 | } |
5987 | |
5988 | static char * |
5989 | scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM, char *str, int quotes, |
5990 | int zero) |
5991 | { |
5992 | // This commented out code was added by James Simmons <jsimmons@infradead.org> |
5993 | // as part of a larger change when he added support for ${var/a/b}. |
5994 | // However, it broke # and % operators: |
5995 | // |
5996 | //var=ababcdcd |
5997 | // ok bad |
5998 | //echo ${var#ab} abcdcd abcdcd |
5999 | //echo ${var##ab} abcdcd abcdcd |
6000 | //echo ${var#a*b} abcdcd ababcdcd (!) |
6001 | //echo ${var##a*b} cdcd cdcd |
6002 | //echo ${var#?} babcdcd ababcdcd (!) |
6003 | //echo ${var##?} babcdcd babcdcd |
6004 | //echo ${var#*} ababcdcd babcdcd (!) |
6005 | //echo ${var##*} |
6006 | //echo ${var%cd} ababcd ababcd |
6007 | //echo ${var%%cd} ababcd abab (!) |
6008 | //echo ${var%c*d} ababcd ababcd |
6009 | //echo ${var%%c*d} abab ababcdcd (!) |
6010 | //echo ${var%?} ababcdc ababcdc |
6011 | //echo ${var%%?} ababcdc ababcdcd (!) |
6012 | //echo ${var%*} ababcdcd ababcdcd |
6013 | //echo ${var%%*} |
6014 | // |
6015 | // Commenting it back out helped. Remove it completely if it really |
6016 | // is not needed. |
6017 | |
6018 | char *loc, *loc2; //, *full; |
6019 | char c; |
6020 | |
6021 | loc = startp; |
6022 | loc2 = rmesc; |
6023 | do { |
6024 | int match; // = strlen(str); |
6025 | const char *s = loc2; |
6026 | |
6027 | c = *loc2; |
6028 | if (zero) { |
6029 | *loc2 = '\0'; |
6030 | s = rmesc; |
6031 | } |
6032 | match = pmatch(str, s); // this line was deleted |
6033 | |
6034 | // // chop off end if its '*' |
6035 | // full = strrchr(str, '*'); |
6036 | // if (full && full != str) |
6037 | // match--; |
6038 | // |
6039 | // // If str starts with '*' replace with s. |
6040 | // if ((*str == '*') && strlen(s) >= match) { |
6041 | // full = xstrdup(s); |
6042 | // strncpy(full+strlen(s)-match+1, str+1, match-1); |
6043 | // } else |
6044 | // full = xstrndup(str, match); |
6045 | // match = strncmp(s, full, strlen(full)); |
6046 | // free(full); |
6047 | // |
6048 | *loc2 = c; |
6049 | if (match) // if (!match) |
6050 | return loc; |
6051 | if (quotes && (unsigned char)*loc == CTLESC) |
6052 | loc++; |
6053 | loc++; |
6054 | loc2++; |
6055 | } while (c); |
6056 | return 0; |
6057 | } |
6058 | |
6059 | static char * |
6060 | scanright(char *startp, char *rmesc, char *rmescend, char *pattern, int quotes, int match_at_start) |
6061 | { |
6062 | #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE |
6063 | int try2optimize = match_at_start; |
6064 | #endif |
6065 | int esc = 0; |
6066 | char *loc; |
6067 | char *loc2; |
6068 | |
6069 | /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}": |
6070 | * startp="escaped_value_of_v" rmesc="raw_value_of_v" |
6071 | * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1 |
6072 | * Logic: |
6073 | * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc, |
6074 | * and on each iteration they go back two/one char until they reach the beginning. |
6075 | * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc. |
6076 | */ |
6077 | /* TODO: document in what other circumstances we are called. */ |
6078 | |
6079 | for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) { |
6080 | int match; |
6081 | char c = *loc2; |
6082 | const char *s = loc2; |
6083 | if (match_at_start) { |
6084 | *loc2 = '\0'; |
6085 | s = rmesc; |
6086 | } |
6087 | match = pmatch(pattern, s); |
6088 | //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match); |
6089 | *loc2 = c; |
6090 | if (match) |
6091 | return loc; |
6092 | #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE |
6093 | if (try2optimize) { |
6094 | /* Maybe we can optimize this: |
6095 | * if pattern ends with unescaped *, we can avoid checking |
6096 | * shorter strings: if "foo*" doesnt match "raw_value_of_v", |
6097 | * it wont match truncated "raw_value_of_" strings too. |
6098 | */ |
6099 | unsigned plen = strlen(pattern); |
6100 | /* Does it end with "*"? */ |
6101 | if (plen != 0 && pattern[--plen] == '*') { |
6102 | /* "xxxx*" is not escaped */ |
6103 | /* "xxx\*" is escaped */ |
6104 | /* "xx\\*" is not escaped */ |
6105 | /* "x\\\*" is escaped */ |
6106 | int slashes = 0; |
6107 | while (plen != 0 && pattern[--plen] == '\\') |
6108 | slashes++; |
6109 | if (!(slashes & 1)) |
6110 | break; /* ends with unescaped "*" */ |
6111 | } |
6112 | try2optimize = 0; |
6113 | } |
6114 | #endif |
6115 | loc--; |
6116 | if (quotes) { |
6117 | if (--esc < 0) { |
6118 | esc = esclen(startp, loc); |
6119 | } |
6120 | if (esc % 2) { |
6121 | esc--; |
6122 | loc--; |
6123 | } |
6124 | } |
6125 | } |
6126 | return 0; |
6127 | } |
6128 | |
6129 | static void varunset(const char *, const char *, const char *, int) NORETURN; |
6130 | static void |
6131 | varunset(const char *end, const char *var, const char *umsg, int varflags) |
6132 | { |
6133 | const char *msg; |
6134 | const char *tail; |
6135 | |
6136 | tail = nullstr; |
6137 | msg = "parameter not set"; |
6138 | if (umsg) { |
6139 | if ((unsigned char)*end == CTLENDVAR) { |
6140 | if (varflags & VSNUL) |
6141 | tail = " or null"; |
6142 | } else { |
6143 | msg = umsg; |
6144 | } |
6145 | } |
6146 | ash_msg_and_raise_error("%.*s: %s%s", end - var - 1, var, msg, tail); |
6147 | } |
6148 | |
6149 | #if ENABLE_ASH_BASH_COMPAT |
6150 | static char * |
6151 | parse_sub_pattern(char *arg, int inquotes) |
6152 | { |
6153 | char *idx, *repl = NULL; |
6154 | unsigned char c; |
6155 | |
6156 | idx = arg; |
6157 | while (1) { |
6158 | c = *arg; |
6159 | if (!c) |
6160 | break; |
6161 | if (c == '/') { |
6162 | /* Only the first '/' seen is our separator */ |
6163 | if (!repl) { |
6164 | repl = idx + 1; |
6165 | c = '\0'; |
6166 | } |
6167 | } |
6168 | *idx++ = c; |
6169 | if (!inquotes && c == '\\' && arg[1] == '\\') |
6170 | arg++; /* skip both \\, not just first one */ |
6171 | arg++; |
6172 | } |
6173 | *idx = c; /* NUL */ |
6174 | |
6175 | return repl; |
6176 | } |
6177 | #endif /* ENABLE_ASH_BASH_COMPAT */ |
6178 | |
6179 | static const char * |
6180 | subevalvar(char *p, char *str, int strloc, int subtype, |
6181 | int startloc, int varflags, int quotes, struct strlist *var_str_list) |
6182 | { |
6183 | struct nodelist *saveargbackq = argbackq; |
6184 | char *startp; |
6185 | char *loc; |
6186 | char *rmesc, *rmescend; |
6187 | IF_ASH_BASH_COMPAT(const char *repl = NULL;) |
6188 | IF_ASH_BASH_COMPAT(int pos, len, orig_len;) |
6189 | int saveherefd = herefd; |
6190 | int amount, workloc, resetloc; |
6191 | int zero; |
6192 | char *(*scan)(char*, char*, char*, char*, int, int); |
6193 | |
6194 | herefd = -1; |
6195 | argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0, |
6196 | var_str_list); |
6197 | STPUTC('\0', expdest); |
6198 | herefd = saveherefd; |
6199 | argbackq = saveargbackq; |
6200 | startp = (char *)stackblock() + startloc; |
6201 | |
6202 | switch (subtype) { |
6203 | case VSASSIGN: |
6204 | setvar(str, startp, 0); |
6205 | amount = startp - expdest; |
6206 | STADJUST(amount, expdest); |
6207 | return startp; |
6208 | |
6209 | #if ENABLE_ASH_BASH_COMPAT |
6210 | case VSSUBSTR: |
6211 | loc = str = stackblock() + strloc; |
6212 | /* Read POS in ${var:POS:LEN} */ |
6213 | pos = atoi(loc); /* number(loc) errors out on "1:4" */ |
6214 | len = str - startp - 1; |
6215 | |
6216 | /* *loc != '\0', guaranteed by parser */ |
6217 | if (quotes) { |
6218 | char *ptr; |
6219 | |
6220 | /* Adjust the length by the number of escapes */ |
6221 | for (ptr = startp; ptr < (str - 1); ptr++) { |
6222 | if ((unsigned char)*ptr == CTLESC) { |
6223 | len--; |
6224 | ptr++; |
6225 | } |
6226 | } |
6227 | } |
6228 | orig_len = len; |
6229 | |
6230 | if (*loc++ == ':') { |
6231 | /* ${var::LEN} */ |
6232 | len = number(loc); |
6233 | } else { |
6234 | /* Skip POS in ${var:POS:LEN} */ |
6235 | len = orig_len; |
6236 | while (*loc && *loc != ':') { |
6237 | /* TODO? |
6238 | * bash complains on: var=qwe; echo ${var:1a:123} |
6239 | if (!isdigit(*loc)) |
6240 | ash_msg_and_raise_error(msg_illnum, str); |
6241 | */ |
6242 | loc++; |
6243 | } |
6244 | if (*loc++ == ':') { |
6245 | len = number(loc); |
6246 | } |
6247 | } |
6248 | if (pos >= orig_len) { |
6249 | pos = 0; |
6250 | len = 0; |
6251 | } |
6252 | if (len > (orig_len - pos)) |
6253 | len = orig_len - pos; |
6254 | |
6255 | for (str = startp; pos; str++, pos--) { |
6256 | if (quotes && (unsigned char)*str == CTLESC) |
6257 | str++; |
6258 | } |
6259 | for (loc = startp; len; len--) { |
6260 | if (quotes && (unsigned char)*str == CTLESC) |
6261 | *loc++ = *str++; |
6262 | *loc++ = *str++; |
6263 | } |
6264 | *loc = '\0'; |
6265 | amount = loc - expdest; |
6266 | STADJUST(amount, expdest); |
6267 | return loc; |
6268 | #endif |
6269 | |
6270 | case VSQUESTION: |
6271 | varunset(p, str, startp, varflags); |
6272 | /* NOTREACHED */ |
6273 | } |
6274 | resetloc = expdest - (char *)stackblock(); |
6275 | |
6276 | /* We'll comeback here if we grow the stack while handling |
6277 | * a VSREPLACE or VSREPLACEALL, since our pointers into the |
6278 | * stack will need rebasing, and we'll need to remove our work |
6279 | * areas each time |
6280 | */ |
6281 | IF_ASH_BASH_COMPAT(restart:) |
6282 | |
6283 | amount = expdest - ((char *)stackblock() + resetloc); |
6284 | STADJUST(-amount, expdest); |
6285 | startp = (char *)stackblock() + startloc; |
6286 | |
6287 | rmesc = startp; |
6288 | rmescend = (char *)stackblock() + strloc; |
6289 | if (quotes) { |
6290 | rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW); |
6291 | if (rmesc != startp) { |
6292 | rmescend = expdest; |
6293 | startp = (char *)stackblock() + startloc; |
6294 | } |
6295 | } |
6296 | rmescend--; |
6297 | str = (char *)stackblock() + strloc; |
6298 | preglob(str, varflags & VSQUOTE, 0); |
6299 | workloc = expdest - (char *)stackblock(); |
6300 | |
6301 | #if ENABLE_ASH_BASH_COMPAT |
6302 | if (subtype == VSREPLACE || subtype == VSREPLACEALL) { |
6303 | char *idx, *end; |
6304 | |
6305 | if (!repl) { |
6306 | repl = parse_sub_pattern(str, varflags & VSQUOTE); |
6307 | if (!repl) |
6308 | repl = nullstr; |
6309 | } |
6310 | |
6311 | /* If there's no pattern to match, return the expansion unmolested */ |
6312 | if (str[0] == '\0') |
6313 | return 0; |
6314 | |
6315 | len = 0; |
6316 | idx = startp; |
6317 | end = str - 1; |
6318 | while (idx < end) { |
6319 | try_to_match: |
6320 | loc = scanright(idx, rmesc, rmescend, str, quotes, 1); |
6321 | if (!loc) { |
6322 | /* No match, advance */ |
6323 | char *restart_detect = stackblock(); |
6324 | skip_matching: |
6325 | STPUTC(*idx, expdest); |
6326 | if (quotes && (unsigned char)*idx == CTLESC) { |
6327 | idx++; |
6328 | len++; |
6329 | STPUTC(*idx, expdest); |
6330 | } |
6331 | if (stackblock() != restart_detect) |
6332 | goto restart; |
6333 | idx++; |
6334 | len++; |
6335 | rmesc++; |
6336 | /* continue; - prone to quadratic behavior, smarter code: */ |
6337 | if (idx >= end) |
6338 | break; |
6339 | if (str[0] == '*') { |
6340 | /* Pattern is "*foo". If "*foo" does not match "long_string", |
6341 | * it would never match "ong_string" etc, no point in trying. |
6342 | */ |
6343 | goto skip_matching; |
6344 | } |
6345 | goto try_to_match; |
6346 | } |
6347 | |
6348 | if (subtype == VSREPLACEALL) { |
6349 | while (idx < loc) { |
6350 | if (quotes && (unsigned char)*idx == CTLESC) |
6351 | idx++; |
6352 | idx++; |
6353 | rmesc++; |
6354 | } |
6355 | } else { |
6356 | idx = loc; |
6357 | } |
6358 | |
6359 | for (loc = (char*)repl; *loc; loc++) { |
6360 | char *restart_detect = stackblock(); |
6361 | if (quotes && *loc == '\\') { |
6362 | STPUTC(CTLESC, expdest); |
6363 | len++; |
6364 | } |
6365 | STPUTC(*loc, expdest); |
6366 | if (stackblock() != restart_detect) |
6367 | goto restart; |
6368 | len++; |
6369 | } |
6370 | |
6371 | if (subtype == VSREPLACE) { |
6372 | while (*idx) { |
6373 | char *restart_detect = stackblock(); |
6374 | if (quotes && *idx == '\\') { |
6375 | STPUTC(CTLESC, expdest); |
6376 | len++; |
6377 | } |
6378 | STPUTC(*idx, expdest); |
6379 | if (stackblock() != restart_detect) |
6380 | goto restart; |
6381 | len++; |
6382 | idx++; |
6383 | } |
6384 | break; |
6385 | } |
6386 | } |
6387 | |
6388 | /* We've put the replaced text into a buffer at workloc, now |
6389 | * move it to the right place and adjust the stack. |
6390 | */ |
6391 | STPUTC('\0', expdest); |
6392 | startp = (char *)stackblock() + startloc; |
6393 | memmove(startp, (char *)stackblock() + workloc, len + 1); |
6394 | amount = expdest - (startp + len); |
6395 | STADJUST(-amount, expdest); |
6396 | return startp; |
6397 | } |
6398 | #endif /* ENABLE_ASH_BASH_COMPAT */ |
6399 | |
6400 | subtype -= VSTRIMRIGHT; |
6401 | #if DEBUG |
6402 | if (subtype < 0 || subtype > 7) |
6403 | abort(); |
6404 | #endif |
6405 | /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */ |
6406 | zero = subtype >> 1; |
6407 | /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */ |
6408 | scan = (subtype & 1) ^ zero ? scanleft : scanright; |
6409 | |
6410 | loc = scan(startp, rmesc, rmescend, str, quotes, zero); |
6411 | if (loc) { |
6412 | if (zero) { |
6413 | memmove(startp, loc, str - loc); |
6414 | loc = startp + (str - loc) - 1; |
6415 | } |
6416 | *loc = '\0'; |
6417 | amount = loc - expdest; |
6418 | STADJUST(amount, expdest); |
6419 | } |
6420 | return loc; |
6421 | } |
6422 | |
6423 | /* |
6424 | * Add the value of a specialized variable to the stack string. |
6425 | * name parameter (examples): |
6426 | * ash -c 'echo $1' name:'1=' |
6427 | * ash -c 'echo $qwe' name:'qwe=' |
6428 | * ash -c 'echo $$' name:'$=' |
6429 | * ash -c 'echo ${$}' name:'$=' |
6430 | * ash -c 'echo ${$##q}' name:'$=q' |
6431 | * ash -c 'echo ${#$}' name:'$=' |
6432 | * note: examples with bad shell syntax: |
6433 | * ash -c 'echo ${#$1}' name:'$=1' |
6434 | * ash -c 'echo ${#1#}' name:'1=#' |
6435 | */ |
6436 | static NOINLINE ssize_t |
6437 | varvalue(char *name, int varflags, int flags, struct strlist *var_str_list) |
6438 | { |
6439 | const char *p; |
6440 | int num; |
6441 | int i; |
6442 | int sepq = 0; |
6443 | ssize_t len = 0; |
6444 | int subtype = varflags & VSTYPE; |
6445 | int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR); |
6446 | int quoted = varflags & VSQUOTE; |
6447 | int syntax = quoted ? DQSYNTAX : BASESYNTAX; |
6448 | |
6449 | switch (*name) { |
6450 | case '$': |
6451 | num = rootpid; |
6452 | goto numvar; |
6453 | case '?': |
6454 | num = exitstatus; |
6455 | goto numvar; |
6456 | case '#': |
6457 | num = shellparam.nparam; |
6458 | goto numvar; |
6459 | case '!': |
6460 | num = backgndpid; |
6461 | if (num == 0) |
6462 | return -1; |
6463 | numvar: |
6464 | len = cvtnum(num); |
6465 | goto check_1char_name; |
6466 | case '-': |
6467 | expdest = makestrspace(NOPTS, expdest); |
6468 | for (i = NOPTS - 1; i >= 0; i--) { |
6469 | if (optlist[i]) { |
6470 | USTPUTC(optletters(i), expdest); |
6471 | len++; |
6472 | } |
6473 | } |
6474 | check_1char_name: |
6475 | #if 0 |
6476 | /* handles cases similar to ${#$1} */ |
6477 | if (name[2] != '\0') |
6478 | raise_error_syntax("bad substitution"); |
6479 | #endif |
6480 | break; |
6481 | case '@': { |
6482 | char **ap; |
6483 | int sep; |
6484 | |
6485 | if (quoted && (flags & EXP_FULL)) { |
6486 | /* note: this is not meant as PEOF value */ |
6487 | sep = 1 << CHAR_BIT; |
6488 | goto param; |
6489 | } |
6490 | /* fall through */ |
6491 | case '*': |
6492 | sep = ifsset() ? (unsigned char)(ifsval()[0]) : ' '; |
6493 | i = SIT(sep, syntax); |
6494 | if (quotes && (i == CCTL || i == CBACK)) |
6495 | sepq = 1; |
6496 | param: |
6497 | ap = shellparam.p; |
6498 | if (!ap) |
6499 | return -1; |
6500 | while ((p = *ap++) != NULL) { |
6501 | size_t partlen; |
6502 | |
6503 | partlen = strlen(p); |
6504 | len += partlen; |
6505 | |
6506 | if (!(subtype == VSPLUS || subtype == VSLENGTH)) |
6507 | memtodest(p, partlen, syntax, quotes); |
6508 | |
6509 | if (*ap && sep) { |
6510 | char *q; |
6511 | |
6512 | len++; |
6513 | if (subtype == VSPLUS || subtype == VSLENGTH) { |
6514 | continue; |
6515 | } |
6516 | q = expdest; |
6517 | if (sepq) |
6518 | STPUTC(CTLESC, q); |
6519 | /* note: may put NUL despite sep != 0 |
6520 | * (see sep = 1 << CHAR_BIT above) */ |
6521 | STPUTC(sep, q); |
6522 | expdest = q; |
6523 | } |
6524 | } |
6525 | return len; |
6526 | } /* case '@' and '*' */ |
6527 | case '0': |
6528 | case '1': |
6529 | case '2': |
6530 | case '3': |
6531 | case '4': |
6532 | case '5': |
6533 | case '6': |
6534 | case '7': |
6535 | case '8': |
6536 | case '9': |
6537 | num = atoi(name); /* number(name) fails on ${N#str} etc */ |
6538 | if (num < 0 || num > shellparam.nparam) |
6539 | return -1; |
6540 | p = num ? shellparam.p[num - 1] : arg0; |
6541 | goto value; |
6542 | default: |
6543 | /* NB: name has form "VAR=..." */ |
6544 | |
6545 | /* "A=a B=$A" case: var_str_list is a list of "A=a" strings |
6546 | * which should be considered before we check variables. */ |
6547 | if (var_str_list) { |
6548 | unsigned name_len = (strchrnul(name, '=') - name) + 1; |
6549 | p = NULL; |
6550 | do { |
6551 | char *str, *eq; |
6552 | str = var_str_list->text; |
6553 | eq = strchr(str, '='); |
6554 | if (!eq) /* stop at first non-assignment */ |
6555 | break; |
6556 | eq++; |
6557 | if (name_len == (unsigned)(eq - str) |
6558 | && strncmp(str, name, name_len) == 0 |
6559 | ) { |
6560 | p = eq; |
6561 | /* goto value; - WRONG! */ |
6562 | /* think "A=1 A=2 B=$A" */ |
6563 | } |
6564 | var_str_list = var_str_list->next; |
6565 | } while (var_str_list); |
6566 | if (p) |
6567 | goto value; |
6568 | } |
6569 | p = lookupvar(name); |
6570 | value: |
6571 | if (!p) |
6572 | return -1; |
6573 | |
6574 | len = strlen(p); |
6575 | if (!(subtype == VSPLUS || subtype == VSLENGTH)) |
6576 | memtodest(p, len, syntax, quotes); |
6577 | return len; |
6578 | } |
6579 | |
6580 | if (subtype == VSPLUS || subtype == VSLENGTH) |
6581 | STADJUST(-len, expdest); |
6582 | return len; |
6583 | } |
6584 | |
6585 | /* |
6586 | * Expand a variable, and return a pointer to the next character in the |
6587 | * input string. |
6588 | */ |
6589 | static char * |
6590 | evalvar(char *p, int flags, struct strlist *var_str_list) |
6591 | { |
6592 | char varflags; |
6593 | char subtype; |
6594 | char quoted; |
6595 | char easy; |
6596 | char *var; |
6597 | int patloc; |
6598 | int startloc; |
6599 | ssize_t varlen; |
6600 | |
6601 | varflags = (unsigned char) *p++; |
6602 | subtype = varflags & VSTYPE; |
6603 | quoted = varflags & VSQUOTE; |
6604 | var = p; |
6605 | easy = (!quoted || (*var == '@' && shellparam.nparam)); |
6606 | startloc = expdest - (char *)stackblock(); |
6607 | p = strchr(p, '=') + 1; //TODO: use var_end(p)? |
6608 | |
6609 | again: |
6610 | varlen = varvalue(var, varflags, flags, var_str_list); |
6611 | if (varflags & VSNUL) |
6612 | varlen--; |
6613 | |
6614 | if (subtype == VSPLUS) { |
6615 | varlen = -1 - varlen; |
6616 | goto vsplus; |
6617 | } |
6618 | |
6619 | if (subtype == VSMINUS) { |
6620 | vsplus: |
6621 | if (varlen < 0) { |
6622 | argstr( |
6623 | p, flags | EXP_TILDE | |
6624 | (quoted ? EXP_QWORD : EXP_WORD), |
6625 | var_str_list |
6626 | ); |
6627 | goto end; |
6628 | } |
6629 | if (easy) |
6630 | goto record; |
6631 | goto end; |
6632 | } |
6633 | |
6634 | if (subtype == VSASSIGN || subtype == VSQUESTION) { |
6635 | if (varlen < 0) { |
6636 | if (subevalvar(p, var, /* strloc: */ 0, |
6637 | subtype, startloc, varflags, |
6638 | /* quotes: */ 0, |
6639 | var_str_list) |
6640 | ) { |
6641 | varflags &= ~VSNUL; |
6642 | /* |
6643 | * Remove any recorded regions beyond |
6644 | * start of variable |
6645 | */ |
6646 | removerecordregions(startloc); |
6647 | goto again; |
6648 | } |
6649 | goto end; |
6650 | } |
6651 | if (easy) |
6652 | goto record; |
6653 | goto end; |
6654 | } |
6655 | |
6656 | if (varlen < 0 && uflag) |
6657 | varunset(p, var, 0, 0); |
6658 | |
6659 | if (subtype == VSLENGTH) { |
6660 | cvtnum(varlen > 0 ? varlen : 0); |
6661 | goto record; |
6662 | } |
6663 | |
6664 | if (subtype == VSNORMAL) { |
6665 | if (easy) |
6666 | goto record; |
6667 | goto end; |
6668 | } |
6669 | |
6670 | #if DEBUG |
6671 | switch (subtype) { |
6672 | case VSTRIMLEFT: |
6673 | case VSTRIMLEFTMAX: |
6674 | case VSTRIMRIGHT: |
6675 | case VSTRIMRIGHTMAX: |
6676 | #if ENABLE_ASH_BASH_COMPAT |
6677 | case VSSUBSTR: |
6678 | case VSREPLACE: |
6679 | case VSREPLACEALL: |
6680 | #endif |
6681 | break; |
6682 | default: |
6683 | abort(); |
6684 | } |
6685 | #endif |
6686 | |
6687 | if (varlen >= 0) { |
6688 | /* |
6689 | * Terminate the string and start recording the pattern |
6690 | * right after it |
6691 | */ |
6692 | STPUTC('\0', expdest); |
6693 | patloc = expdest - (char *)stackblock(); |
6694 | if (NULL == subevalvar(p, /* str: */ NULL, patloc, subtype, |
6695 | startloc, varflags, |
6696 | //TODO: | EXP_REDIR too? All other such places do it too |
6697 | /* quotes: */ flags & (EXP_FULL | EXP_CASE), |
6698 | var_str_list) |
6699 | ) { |
6700 | int amount = expdest - ( |
6701 | (char *)stackblock() + patloc - 1 |
6702 | ); |
6703 | STADJUST(-amount, expdest); |
6704 | } |
6705 | /* Remove any recorded regions beyond start of variable */ |
6706 | removerecordregions(startloc); |
6707 | record: |
6708 | recordregion(startloc, expdest - (char *)stackblock(), quoted); |
6709 | } |
6710 | |
6711 | end: |
6712 | if (subtype != VSNORMAL) { /* skip to end of alternative */ |
6713 | int nesting = 1; |
6714 | for (;;) { |
6715 | unsigned char c = *p++; |
6716 | if (c == CTLESC) |
6717 | p++; |
6718 | else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { |
6719 | if (varlen >= 0) |
6720 | argbackq = argbackq->next; |
6721 | } else if (c == CTLVAR) { |
6722 | if ((*p++ & VSTYPE) != VSNORMAL) |
6723 | nesting++; |
6724 | } else if (c == CTLENDVAR) { |
6725 | if (--nesting == 0) |
6726 | break; |
6727 | } |
6728 | } |
6729 | } |
6730 | return p; |
6731 | } |
6732 | |
6733 | /* |
6734 | * Break the argument string into pieces based upon IFS and add the |
6735 | * strings to the argument list. The regions of the string to be |
6736 | * searched for IFS characters have been stored by recordregion. |
6737 | */ |
6738 | static void |
6739 | ifsbreakup(char *string, struct arglist *arglist) |
6740 | { |
6741 | struct ifsregion *ifsp; |
6742 | struct strlist *sp; |
6743 | char *start; |
6744 | char *p; |
6745 | char *q; |
6746 | const char *ifs, *realifs; |
6747 | int ifsspc; |
6748 | int nulonly; |
6749 | |
6750 | start = string; |
6751 | if (ifslastp != NULL) { |
6752 | ifsspc = 0; |
6753 | nulonly = 0; |
6754 | realifs = ifsset() ? ifsval() : defifs; |
6755 | ifsp = &ifsfirst; |
6756 | do { |
6757 | p = string + ifsp->begoff; |
6758 | nulonly = ifsp->nulonly; |
6759 | ifs = nulonly ? nullstr : realifs; |
6760 | ifsspc = 0; |
6761 | while (p < string + ifsp->endoff) { |
6762 | q = p; |
6763 | if ((unsigned char)*p == CTLESC) |
6764 | p++; |
6765 | if (!strchr(ifs, *p)) { |
6766 | p++; |
6767 | continue; |
6768 | } |
6769 | if (!nulonly) |
6770 | ifsspc = (strchr(defifs, *p) != NULL); |
6771 | /* Ignore IFS whitespace at start */ |
6772 | if (q == start && ifsspc) { |
6773 | p++; |
6774 | start = p; |
6775 | continue; |
6776 | } |
6777 | *q = '\0'; |
6778 | sp = stzalloc(sizeof(*sp)); |
6779 | sp->text = start; |
6780 | *arglist->lastp = sp; |
6781 | arglist->lastp = &sp->next; |
6782 | p++; |
6783 | if (!nulonly) { |
6784 | for (;;) { |
6785 | if (p >= string + ifsp->endoff) { |
6786 | break; |
6787 | } |
6788 | q = p; |
6789 | if ((unsigned char)*p == CTLESC) |
6790 | p++; |
6791 | if (strchr(ifs, *p) == NULL) { |
6792 | p = q; |
6793 | break; |
6794 | } |
6795 | if (strchr(defifs, *p) == NULL) { |
6796 | if (ifsspc) { |
6797 | p++; |
6798 | ifsspc = 0; |
6799 | } else { |
6800 | p = q; |
6801 | break; |
6802 | } |
6803 | } else |
6804 | p++; |
6805 | } |
6806 | } |
6807 | start = p; |
6808 | } /* while */ |
6809 | ifsp = ifsp->next; |
6810 | } while (ifsp != NULL); |
6811 | if (nulonly) |
6812 | goto add; |
6813 | } |
6814 | |
6815 | if (!*start) |
6816 | return; |
6817 | |
6818 | add: |
6819 | sp = stzalloc(sizeof(*sp)); |
6820 | sp->text = start; |
6821 | *arglist->lastp = sp; |
6822 | arglist->lastp = &sp->next; |
6823 | } |
6824 | |
6825 | static void |
6826 | ifsfree(void) |
6827 | { |
6828 | struct ifsregion *p; |
6829 | |
6830 | INT_OFF; |
6831 | p = ifsfirst.next; |
6832 | do { |
6833 | struct ifsregion *ifsp; |
6834 | ifsp = p->next; |
6835 | free(p); |
6836 | p = ifsp; |
6837 | } while (p); |
6838 | ifslastp = NULL; |
6839 | ifsfirst.next = NULL; |
6840 | INT_ON; |
6841 | } |
6842 | |
6843 | /* |
6844 | * Add a file name to the list. |
6845 | */ |
6846 | static void |
6847 | addfname(const char *name) |
6848 | { |
6849 | struct strlist *sp; |
6850 | |
6851 | sp = stzalloc(sizeof(*sp)); |
6852 | sp->text = ststrdup(name); |
6853 | *exparg.lastp = sp; |
6854 | exparg.lastp = &sp->next; |
6855 | } |
6856 | |
6857 | /* |
6858 | * Do metacharacter (i.e. *, ?, [...]) expansion. |
6859 | */ |
6860 | static void |
6861 | expmeta(char *expdir, char *enddir, char *name) |
6862 | { |
6863 | char *p; |
6864 | const char *cp; |
6865 | char *start; |
6866 | char *endname; |
6867 | int metaflag; |
6868 | struct stat statb; |
6869 | DIR *dirp; |
6870 | struct dirent *dp; |
6871 | int atend; |
6872 | int matchdot; |
6873 | |
6874 | metaflag = 0; |
6875 | start = name; |
6876 | for (p = name; *p; p++) { |
6877 | if (*p == '*' || *p == '?') |
6878 | metaflag = 1; |
6879 | else if (*p == '[') { |
6880 | char *q = p + 1; |
6881 | if (*q == '!') |
6882 | q++; |
6883 | for (;;) { |
6884 | if (*q == '\\') |
6885 | q++; |
6886 | if (*q == '/' || *q == '\0') |
6887 | break; |
6888 | if (*++q == ']') { |
6889 | metaflag = 1; |
6890 | break; |
6891 | } |
6892 | } |
6893 | } else if (*p == '\\') |
6894 | p++; |
6895 | else if (*p == '/') { |
6896 | if (metaflag) |
6897 | goto out; |
6898 | start = p + 1; |
6899 | } |
6900 | } |
6901 | out: |
6902 | if (metaflag == 0) { /* we've reached the end of the file name */ |
6903 | if (enddir != expdir) |
6904 | metaflag++; |
6905 | p = name; |
6906 | do { |
6907 | if (*p == '\\') |
6908 | p++; |
6909 | *enddir++ = *p; |
6910 | } while (*p++); |
6911 | if (metaflag == 0 || lstat(expdir, &statb) >= 0) |
6912 | addfname(expdir); |
6913 | return; |
6914 | } |
6915 | endname = p; |
6916 | if (name < start) { |
6917 | p = name; |
6918 | do { |
6919 | if (*p == '\\') |
6920 | p++; |
6921 | *enddir++ = *p++; |
6922 | } while (p < start); |
6923 | } |
6924 | if (enddir == expdir) { |
6925 | cp = "."; |
6926 | } else if (enddir == expdir + 1 && *expdir == '/') { |
6927 | cp = "/"; |
6928 | } else { |
6929 | cp = expdir; |
6930 | enddir[-1] = '\0'; |
6931 | } |
6932 | dirp = opendir(cp); |
6933 | if (dirp == NULL) |
6934 | return; |
6935 | if (enddir != expdir) |
6936 | enddir[-1] = '/'; |
6937 | if (*endname == 0) { |
6938 | atend = 1; |
6939 | } else { |
6940 | atend = 0; |
6941 | *endname++ = '\0'; |
6942 | } |
6943 | matchdot = 0; |
6944 | p = start; |
6945 | if (*p == '\\') |
6946 | p++; |
6947 | if (*p == '.') |
6948 | matchdot++; |
6949 | while (!pending_int && (dp = readdir(dirp)) != NULL) { |
6950 | if (dp->d_name[0] == '.' && !matchdot) |
6951 | continue; |
6952 | if (pmatch(start, dp->d_name)) { |
6953 | if (atend) { |
6954 | strcpy(enddir, dp->d_name); |
6955 | addfname(expdir); |
6956 | } else { |
6957 | for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';) |
6958 | continue; |
6959 | p[-1] = '/'; |
6960 | expmeta(expdir, p, endname); |
6961 | } |
6962 | } |
6963 | } |
6964 | closedir(dirp); |
6965 | if (!atend) |
6966 | endname[-1] = '/'; |
6967 | } |
6968 | |
6969 | static struct strlist * |
6970 | msort(struct strlist *list, int len) |
6971 | { |
6972 | struct strlist *p, *q = NULL; |
6973 | struct strlist **lpp; |
6974 | int half; |
6975 | int n; |
6976 | |
6977 | if (len <= 1) |
6978 | return list; |
6979 | half = len >> 1; |
6980 | p = list; |
6981 | for (n = half; --n >= 0;) { |
6982 | q = p; |
6983 | p = p->next; |
6984 | } |
6985 | q->next = NULL; /* terminate first half of list */ |
6986 | q = msort(list, half); /* sort first half of list */ |
6987 | p = msort(p, len - half); /* sort second half */ |
6988 | lpp = &list; |
6989 | for (;;) { |
6990 | #if ENABLE_LOCALE_SUPPORT |
6991 | if (strcoll(p->text, q->text) < 0) |
6992 | #else |
6993 | if (strcmp(p->text, q->text) < 0) |
6994 | #endif |
6995 | { |
6996 | *lpp = p; |
6997 | lpp = &p->next; |
6998 | p = *lpp; |
6999 | if (p == NULL) { |
7000 | *lpp = q; |
7001 | break; |
7002 | } |
7003 | } else { |
7004 | *lpp = q; |
7005 | lpp = &q->next; |
7006 | q = *lpp; |
7007 | if (q == NULL) { |
7008 | *lpp = p; |
7009 | break; |
7010 | } |
7011 | } |
7012 | } |
7013 | return list; |
7014 | } |
7015 | |
7016 | /* |
7017 | * Sort the results of file name expansion. It calculates the number of |
7018 | * strings to sort and then calls msort (short for merge sort) to do the |
7019 | * work. |
7020 | */ |
7021 | static struct strlist * |
7022 | expsort(struct strlist *str) |
7023 | { |
7024 | int len; |
7025 | struct strlist *sp; |
7026 | |
7027 | len = 0; |
7028 | for (sp = str; sp; sp = sp->next) |
7029 | len++; |
7030 | return msort(str, len); |
7031 | } |
7032 | |
7033 | static void |
7034 | expandmeta(struct strlist *str /*, int flag*/) |
7035 | { |
7036 | static const char metachars[] ALIGN1 = { |
7037 | '*', '?', '[', 0 |
7038 | }; |
7039 | /* TODO - EXP_REDIR */ |
7040 | |
7041 | while (str) { |
7042 | char *expdir; |
7043 | struct strlist **savelastp; |
7044 | struct strlist *sp; |
7045 | char *p; |
7046 | |
7047 | if (fflag) |
7048 | goto nometa; |
7049 | if (!strpbrk(str->text, metachars)) |
7050 | goto nometa; |
7051 | savelastp = exparg.lastp; |
7052 | |
7053 | INT_OFF; |
7054 | p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP); |
7055 | { |
7056 | int i = strlen(str->text); |
7057 | expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */ |
7058 | } |
7059 | expmeta(expdir, expdir, p); |
7060 | free(expdir); |
7061 | if (p != str->text) |
7062 | free(p); |
7063 | INT_ON; |
7064 | if (exparg.lastp == savelastp) { |
7065 | /* |
7066 | * no matches |
7067 | */ |
7068 | nometa: |
7069 | *exparg.lastp = str; |
7070 | rmescapes(str->text, 0); |
7071 | exparg.lastp = &str->next; |
7072 | } else { |
7073 | *exparg.lastp = NULL; |
7074 | *savelastp = sp = expsort(*savelastp); |
7075 | while (sp->next != NULL) |
7076 | sp = sp->next; |
7077 | exparg.lastp = &sp->next; |
7078 | } |
7079 | str = str->next; |
7080 | } |
7081 | } |
7082 | |
7083 | /* |
7084 | * Perform variable substitution and command substitution on an argument, |
7085 | * placing the resulting list of arguments in arglist. If EXP_FULL is true, |
7086 | * perform splitting and file name expansion. When arglist is NULL, perform |
7087 | * here document expansion. |
7088 | */ |
7089 | static void |
7090 | expandarg(union node *arg, struct arglist *arglist, int flag) |
7091 | { |
7092 | struct strlist *sp; |
7093 | char *p; |
7094 | |
7095 | argbackq = arg->narg.backquote; |
7096 | STARTSTACKSTR(expdest); |
7097 | ifsfirst.next = NULL; |
7098 | ifslastp = NULL; |
7099 | argstr(arg->narg.text, flag, |
7100 | /* var_str_list: */ arglist ? arglist->list : NULL); |
7101 | p = _STPUTC('\0', expdest); |
7102 | expdest = p - 1; |
7103 | if (arglist == NULL) { |
7104 | return; /* here document expanded */ |
7105 | } |
7106 | p = grabstackstr(p); |
7107 | exparg.lastp = &exparg.list; |
7108 | /* |
7109 | * TODO - EXP_REDIR |
7110 | */ |
7111 | if (flag & EXP_FULL) { |
7112 | ifsbreakup(p, &exparg); |
7113 | *exparg.lastp = NULL; |
7114 | exparg.lastp = &exparg.list; |
7115 | expandmeta(exparg.list /*, flag*/); |
7116 | } else { |
7117 | if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ |
7118 | rmescapes(p, 0); |
7119 | sp = stzalloc(sizeof(*sp)); |
7120 | sp->text = p; |
7121 | *exparg.lastp = sp; |
7122 | exparg.lastp = &sp->next; |
7123 | } |
7124 | if (ifsfirst.next) |
7125 | ifsfree(); |
7126 | *exparg.lastp = NULL; |
7127 | if (exparg.list) { |
7128 | *arglist->lastp = exparg.list; |
7129 | arglist->lastp = exparg.lastp; |
7130 | } |
7131 | } |
7132 | |
7133 | /* |
7134 | * Expand shell variables and backquotes inside a here document. |
7135 | */ |
7136 | static void |
7137 | expandhere(union node *arg, int fd) |
7138 | { |
7139 | herefd = fd; |
7140 | expandarg(arg, (struct arglist *)NULL, 0); |
7141 | full_write(fd, stackblock(), expdest - (char *)stackblock()); |
7142 | } |
7143 | |
7144 | /* |
7145 | * Returns true if the pattern matches the string. |
7146 | */ |
7147 | static int |
7148 | patmatch(char *pattern, const char *string) |
7149 | { |
7150 | return pmatch(preglob(pattern, 0, 0), string); |
7151 | } |
7152 | |
7153 | /* |
7154 | * See if a pattern matches in a case statement. |
7155 | */ |
7156 | static int |
7157 | casematch(union node *pattern, char *val) |
7158 | { |
7159 | struct stackmark smark; |
7160 | int result; |
7161 | |
7162 | setstackmark(&smark); |
7163 | argbackq = pattern->narg.backquote; |
7164 | STARTSTACKSTR(expdest); |
7165 | ifslastp = NULL; |
7166 | argstr(pattern->narg.text, EXP_TILDE | EXP_CASE, |
7167 | /* var_str_list: */ NULL); |
7168 | STACKSTRNUL(expdest); |
7169 | result = patmatch(stackblock(), val); |
7170 | popstackmark(&smark); |
7171 | return result; |
7172 | } |
7173 | |
7174 | |
7175 | /* ============ find_command */ |
7176 | |
7177 | struct builtincmd { |
7178 | const char *name; |
7179 | int (*builtin)(int, char **) FAST_FUNC; |
7180 | /* unsigned flags; */ |
7181 | }; |
7182 | #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1) |
7183 | /* "regular" builtins always take precedence over commands, |
7184 | * regardless of PATH=....%builtin... position */ |
7185 | #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2) |
7186 | #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4) |
7187 | |
7188 | struct cmdentry { |
7189 | smallint cmdtype; /* CMDxxx */ |
7190 | union param { |
7191 | int index; |
7192 | /* index >= 0 for commands without path (slashes) */ |
7193 | /* (TODO: what exactly does the value mean? PATH position?) */ |
7194 | /* index == -1 for commands with slashes */ |
7195 | /* index == (-2 - applet_no) for NOFORK applets */ |
7196 | const struct builtincmd *cmd; |
7197 | struct funcnode *func; |
7198 | } u; |
7199 | }; |
7200 | /* values of cmdtype */ |
7201 | #define CMDUNKNOWN -1 /* no entry in table for command */ |
7202 | #define CMDNORMAL 0 /* command is an executable program */ |
7203 | #define CMDFUNCTION 1 /* command is a shell function */ |
7204 | #define CMDBUILTIN 2 /* command is a shell builtin */ |
7205 | |
7206 | /* action to find_command() */ |
7207 | #define DO_ERR 0x01 /* prints errors */ |
7208 | #define DO_ABS 0x02 /* checks absolute paths */ |
7209 | #define DO_NOFUNC 0x04 /* don't return shell functions, for command */ |
7210 | #define DO_ALTPATH 0x08 /* using alternate path */ |
7211 | #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */ |
7212 | |
7213 | static void find_command(char *, struct cmdentry *, int, const char *); |
7214 | |
7215 | |
7216 | /* ============ Hashing commands */ |
7217 | |
7218 | /* |
7219 | * When commands are first encountered, they are entered in a hash table. |
7220 | * This ensures that a full path search will not have to be done for them |
7221 | * on each invocation. |
7222 | * |
7223 | * We should investigate converting to a linear search, even though that |
7224 | * would make the command name "hash" a misnomer. |
7225 | */ |
7226 | |
7227 | struct tblentry { |
7228 | struct tblentry *next; /* next entry in hash chain */ |
7229 | union param param; /* definition of builtin function */ |
7230 | smallint cmdtype; /* CMDxxx */ |
7231 | char rehash; /* if set, cd done since entry created */ |
7232 | char cmdname[1]; /* name of command */ |
7233 | }; |
7234 | |
7235 | static struct tblentry **cmdtable; |
7236 | #define INIT_G_cmdtable() do { \ |
7237 | cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \ |
7238 | } while (0) |
7239 | |
7240 | static int builtinloc = -1; /* index in path of %builtin, or -1 */ |
7241 | |
7242 | |
7243 | static void |
7244 | tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp) |
7245 | { |
7246 | int repeated = 0; |
7247 | |
7248 | #if ENABLE_FEATURE_SH_STANDALONE |
7249 | if (applet_no >= 0) { |
7250 | if (APPLET_IS_NOEXEC(applet_no)) { |
7251 | clearenv(); |
7252 | while (*envp) |
7253 | putenv(*envp++); |
7254 | run_applet_no_and_exit(applet_no, argv); |
7255 | } |
7256 | /* re-exec ourselves with the new arguments */ |
7257 | execve(bb_busybox_exec_path, argv, envp); |
7258 | /* If they called chroot or otherwise made the binary no longer |
7259 | * executable, fall through */ |
7260 | } |
7261 | #endif |
7262 | |
7263 | repeat: |
7264 | #ifdef SYSV |
7265 | do { |
7266 | execve(cmd, argv, envp); |
7267 | } while (errno == EINTR); |
7268 | #else |
7269 | execve(cmd, argv, envp); |
7270 | #endif |
7271 | if (repeated) { |
7272 | free(argv); |
7273 | return; |
7274 | } |
7275 | if (errno == ENOEXEC) { |
7276 | char **ap; |
7277 | char **new; |
7278 | |
7279 | for (ap = argv; *ap; ap++) |
7280 | continue; |
7281 | ap = new = ckmalloc((ap - argv + 2) * sizeof(ap[0])); |
7282 | ap[1] = cmd; |
7283 | ap[0] = cmd = (char *)DEFAULT_SHELL; |
7284 | ap += 2; |
7285 | argv++; |
7286 | while ((*ap++ = *argv++) != NULL) |
7287 | continue; |
7288 | argv = new; |
7289 | repeated++; |
7290 | goto repeat; |
7291 | } |
7292 | } |
7293 | |
7294 | /* |
7295 | * Exec a program. Never returns. If you change this routine, you may |
7296 | * have to change the find_command routine as well. |
7297 | */ |
7298 | static void shellexec(char **, const char *, int) NORETURN; |
7299 | static void |
7300 | shellexec(char **argv, const char *path, int idx) |
7301 | { |
7302 | char *cmdname; |
7303 | int e; |
7304 | char **envp; |
7305 | int exerrno; |
7306 | #if ENABLE_FEATURE_SH_STANDALONE |
7307 | int applet_no = -1; |
7308 | #endif |
7309 | |
7310 | clearredir(/*drop:*/ 1); |
7311 | envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL); |
7312 | if (strchr(argv[0], '/') != NULL |
7313 | #if ENABLE_FEATURE_SH_STANDALONE |
7314 | || (applet_no = find_applet_by_name(argv[0])) >= 0 |
7315 | #endif |
7316 | ) { |
7317 | tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp); |
7318 | e = errno; |
7319 | } else { |
7320 | e = ENOENT; |
7321 | while ((cmdname = path_advance(&path, argv[0])) != NULL) { |
7322 | if (--idx < 0 && pathopt == NULL) { |
7323 | tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp); |
7324 | if (errno != ENOENT && errno != ENOTDIR) |
7325 | e = errno; |
7326 | } |
7327 | stunalloc(cmdname); |
7328 | } |
7329 | } |
7330 | |
7331 | /* Map to POSIX errors */ |
7332 | switch (e) { |
7333 | case EACCES: |
7334 | exerrno = 126; |
7335 | break; |
7336 | case ENOENT: |
7337 | exerrno = 127; |
7338 | break; |
7339 | default: |
7340 | exerrno = 2; |
7341 | break; |
7342 | } |
7343 | exitstatus = exerrno; |
7344 | TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n", |
7345 | argv[0], e, suppress_int)); |
7346 | ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found")); |
7347 | /* NOTREACHED */ |
7348 | } |
7349 | |
7350 | static void |
7351 | printentry(struct tblentry *cmdp) |
7352 | { |
7353 | int idx; |
7354 | const char *path; |
7355 | char *name; |
7356 | |
7357 | idx = cmdp->param.index; |
7358 | path = pathval(); |
7359 | do { |
7360 | name = path_advance(&path, cmdp->cmdname); |
7361 | stunalloc(name); |
7362 | } while (--idx >= 0); |
7363 | out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr)); |
7364 | } |
7365 | |
7366 | /* |
7367 | * Clear out command entries. The argument specifies the first entry in |
7368 | * PATH which has changed. |
7369 | */ |
7370 | static void |
7371 | clearcmdentry(int firstchange) |
7372 | { |
7373 | struct tblentry **tblp; |
7374 | struct tblentry **pp; |
7375 | struct tblentry *cmdp; |
7376 | |
7377 | INT_OFF; |
7378 | for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) { |
7379 | pp = tblp; |
7380 | while ((cmdp = *pp) != NULL) { |
7381 | if ((cmdp->cmdtype == CMDNORMAL && |
7382 | cmdp->param.index >= firstchange) |
7383 | || (cmdp->cmdtype == CMDBUILTIN && |
7384 | builtinloc >= firstchange) |
7385 | ) { |
7386 | *pp = cmdp->next; |
7387 | free(cmdp); |
7388 | } else { |
7389 | pp = &cmdp->next; |
7390 | } |
7391 | } |
7392 | } |
7393 | INT_ON; |
7394 | } |
7395 | |
7396 | /* |
7397 | * Locate a command in the command hash table. If "add" is nonzero, |
7398 | * add the command to the table if it is not already present. The |
7399 | * variable "lastcmdentry" is set to point to the address of the link |
7400 | * pointing to the entry, so that delete_cmd_entry can delete the |
7401 | * entry. |
7402 | * |
7403 | * Interrupts must be off if called with add != 0. |
7404 | */ |
7405 | static struct tblentry **lastcmdentry; |
7406 | |
7407 | static struct tblentry * |
7408 | cmdlookup(const char *name, int add) |
7409 | { |
7410 | unsigned int hashval; |
7411 | const char *p; |
7412 | struct tblentry *cmdp; |
7413 | struct tblentry **pp; |
7414 | |
7415 | p = name; |
7416 | hashval = (unsigned char)*p << 4; |
7417 | while (*p) |
7418 | hashval += (unsigned char)*p++; |
7419 | hashval &= 0x7FFF; |
7420 | pp = &cmdtable[hashval % CMDTABLESIZE]; |
7421 | for (cmdp = *pp; cmdp; cmdp = cmdp->next) { |
7422 | if (strcmp(cmdp->cmdname, name) == 0) |
7423 | break; |
7424 | pp = &cmdp->next; |
7425 | } |
7426 | if (add && cmdp == NULL) { |
7427 | cmdp = *pp = ckzalloc(sizeof(struct tblentry) |
7428 | + strlen(name) |
7429 | /* + 1 - already done because |
7430 | * tblentry::cmdname is char[1] */); |
7431 | /*cmdp->next = NULL; - ckzalloc did it */ |
7432 | cmdp->cmdtype = CMDUNKNOWN; |
7433 | strcpy(cmdp->cmdname, name); |
7434 | } |
7435 | lastcmdentry = pp; |
7436 | return cmdp; |
7437 | } |
7438 | |
7439 | /* |
7440 | * Delete the command entry returned on the last lookup. |
7441 | */ |
7442 | static void |
7443 | delete_cmd_entry(void) |
7444 | { |
7445 | struct tblentry *cmdp; |
7446 | |
7447 | INT_OFF; |
7448 | cmdp = *lastcmdentry; |
7449 | *lastcmdentry = cmdp->next; |
7450 | if (cmdp->cmdtype == CMDFUNCTION) |
7451 | freefunc(cmdp->param.func); |
7452 | free(cmdp); |
7453 | INT_ON; |
7454 | } |
7455 | |
7456 | /* |
7457 | * Add a new command entry, replacing any existing command entry for |
7458 | * the same name - except special builtins. |
7459 | */ |
7460 | static void |
7461 | addcmdentry(char *name, struct cmdentry *entry) |
7462 | { |
7463 | struct tblentry *cmdp; |
7464 | |
7465 | cmdp = cmdlookup(name, 1); |
7466 | if (cmdp->cmdtype == CMDFUNCTION) { |
7467 | freefunc(cmdp->param.func); |
7468 | } |
7469 | cmdp->cmdtype = entry->cmdtype; |
7470 | cmdp->param = entry->u; |
7471 | cmdp->rehash = 0; |
7472 | } |
7473 | |
7474 | static int FAST_FUNC |
7475 | hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
7476 | { |
7477 | struct tblentry **pp; |
7478 | struct tblentry *cmdp; |
7479 | int c; |
7480 | struct cmdentry entry; |
7481 | char *name; |
7482 | |
7483 | if (nextopt("r") != '\0') { |
7484 | clearcmdentry(0); |
7485 | return 0; |
7486 | } |
7487 | |
7488 | if (*argptr == NULL) { |
7489 | for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) { |
7490 | for (cmdp = *pp; cmdp; cmdp = cmdp->next) { |
7491 | if (cmdp->cmdtype == CMDNORMAL) |
7492 | printentry(cmdp); |
7493 | } |
7494 | } |
7495 | return 0; |
7496 | } |
7497 | |
7498 | c = 0; |
7499 | while ((name = *argptr) != NULL) { |
7500 | cmdp = cmdlookup(name, 0); |
7501 | if (cmdp != NULL |
7502 | && (cmdp->cmdtype == CMDNORMAL |
7503 | || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)) |
7504 | ) { |
7505 | delete_cmd_entry(); |
7506 | } |
7507 | find_command(name, &entry, DO_ERR, pathval()); |
7508 | if (entry.cmdtype == CMDUNKNOWN) |
7509 | c = 1; |
7510 | argptr++; |
7511 | } |
7512 | return c; |
7513 | } |
7514 | |
7515 | /* |
7516 | * Called when a cd is done. Marks all commands so the next time they |
7517 | * are executed they will be rehashed. |
7518 | */ |
7519 | static void |
7520 | hashcd(void) |
7521 | { |
7522 | struct tblentry **pp; |
7523 | struct tblentry *cmdp; |
7524 | |
7525 | for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) { |
7526 | for (cmdp = *pp; cmdp; cmdp = cmdp->next) { |
7527 | if (cmdp->cmdtype == CMDNORMAL |
7528 | || (cmdp->cmdtype == CMDBUILTIN |
7529 | && !IS_BUILTIN_REGULAR(cmdp->param.cmd) |
7530 | && builtinloc > 0) |
7531 | ) { |
7532 | cmdp->rehash = 1; |
7533 | } |
7534 | } |
7535 | } |
7536 | } |
7537 | |
7538 | /* |
7539 | * Fix command hash table when PATH changed. |
7540 | * Called before PATH is changed. The argument is the new value of PATH; |
7541 | * pathval() still returns the old value at this point. |
7542 | * Called with interrupts off. |
7543 | */ |
7544 | static void FAST_FUNC |
7545 | changepath(const char *new) |
7546 | { |
7547 | const char *old; |
7548 | int firstchange; |
7549 | int idx; |
7550 | int idx_bltin; |
7551 | |
7552 | old = pathval(); |
7553 | firstchange = 9999; /* assume no change */ |
7554 | idx = 0; |
7555 | idx_bltin = -1; |
7556 | for (;;) { |
7557 | if (*old != *new) { |
7558 | firstchange = idx; |
7559 | if ((*old == '\0' && *new == ':') |
7560 | || (*old == ':' && *new == '\0') |
7561 | ) { |
7562 | firstchange++; |
7563 | } |
7564 | old = new; /* ignore subsequent differences */ |
7565 | } |
7566 | if (*new == '\0') |
7567 | break; |
7568 | if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin")) |
7569 | idx_bltin = idx; |
7570 | if (*new == ':') |
7571 | idx++; |
7572 | new++; |
7573 | old++; |
7574 | } |
7575 | if (builtinloc < 0 && idx_bltin >= 0) |
7576 | builtinloc = idx_bltin; /* zap builtins */ |
7577 | if (builtinloc >= 0 && idx_bltin < 0) |
7578 | firstchange = 0; |
7579 | clearcmdentry(firstchange); |
7580 | builtinloc = idx_bltin; |
7581 | } |
7582 | |
7583 | #define TEOF 0 |
7584 | #define TNL 1 |
7585 | #define TREDIR 2 |
7586 | #define TWORD 3 |
7587 | #define TSEMI 4 |
7588 | #define TBACKGND 5 |
7589 | #define TAND 6 |
7590 | #define TOR 7 |
7591 | #define TPIPE 8 |
7592 | #define TLP 9 |
7593 | #define TRP 10 |
7594 | #define TENDCASE 11 |
7595 | #define TENDBQUOTE 12 |
7596 | #define TNOT 13 |
7597 | #define TCASE 14 |
7598 | #define TDO 15 |
7599 | #define TDONE 16 |
7600 | #define TELIF 17 |
7601 | #define TELSE 18 |
7602 | #define TESAC 19 |
7603 | #define TFI 20 |
7604 | #define TFOR 21 |
7605 | #define TIF 22 |
7606 | #define TIN 23 |
7607 | #define TTHEN 24 |
7608 | #define TUNTIL 25 |
7609 | #define TWHILE 26 |
7610 | #define TBEGIN 27 |
7611 | #define TEND 28 |
7612 | typedef smallint token_id_t; |
7613 | |
7614 | /* first char is indicating which tokens mark the end of a list */ |
7615 | static const char *const tokname_array[] = { |
7616 | "\1end of file", |
7617 | "\0newline", |
7618 | "\0redirection", |
7619 | "\0word", |
7620 | "\0;", |
7621 | "\0&", |
7622 | "\0&&", |
7623 | "\0||", |
7624 | "\0|", |
7625 | "\0(", |
7626 | "\1)", |
7627 | "\1;;", |
7628 | "\1`", |
7629 | #define KWDOFFSET 13 |
7630 | /* the following are keywords */ |
7631 | "\0!", |
7632 | "\0case", |
7633 | "\1do", |
7634 | "\1done", |
7635 | "\1elif", |
7636 | "\1else", |
7637 | "\1esac", |
7638 | "\1fi", |
7639 | "\0for", |
7640 | "\0if", |
7641 | "\0in", |
7642 | "\1then", |
7643 | "\0until", |
7644 | "\0while", |
7645 | "\0{", |
7646 | "\1}", |
7647 | }; |
7648 | |
7649 | /* Wrapper around strcmp for qsort/bsearch/... */ |
7650 | static int |
7651 | pstrcmp(const void *a, const void *b) |
7652 | { |
7653 | return strcmp((char*) a, (*(char**) b) + 1); |
7654 | } |
7655 | |
7656 | static const char *const * |
7657 | findkwd(const char *s) |
7658 | { |
7659 | return bsearch(s, tokname_array + KWDOFFSET, |
7660 | ARRAY_SIZE(tokname_array) - KWDOFFSET, |
7661 | sizeof(tokname_array[0]), pstrcmp); |
7662 | } |
7663 | |
7664 | /* |
7665 | * Locate and print what a word is... |
7666 | */ |
7667 | static int |
7668 | describe_command(char *command, int describe_command_verbose) |
7669 | { |
7670 | struct cmdentry entry; |
7671 | struct tblentry *cmdp; |
7672 | #if ENABLE_ASH_ALIAS |
7673 | const struct alias *ap; |
7674 | #endif |
7675 | const char *path = pathval(); |
7676 | |
7677 | if (describe_command_verbose) { |
7678 | out1str(command); |
7679 | } |
7680 | |
7681 | /* First look at the keywords */ |
7682 | if (findkwd(command)) { |
7683 | out1str(describe_command_verbose ? " is a shell keyword" : command); |
7684 | goto out; |
7685 | } |
7686 | |
7687 | #if ENABLE_ASH_ALIAS |
7688 | /* Then look at the aliases */ |
7689 | ap = lookupalias(command, 0); |
7690 | if (ap != NULL) { |
7691 | if (!describe_command_verbose) { |
7692 | out1str("alias "); |
7693 | printalias(ap); |
7694 | return 0; |
7695 | } |
7696 | out1fmt(" is an alias for %s", ap->val); |
7697 | goto out; |
7698 | } |
7699 | #endif |
7700 | /* Then check if it is a tracked alias */ |
7701 | cmdp = cmdlookup(command, 0); |
7702 | if (cmdp != NULL) { |
7703 | entry.cmdtype = cmdp->cmdtype; |
7704 | entry.u = cmdp->param; |
7705 | } else { |
7706 | /* Finally use brute force */ |
7707 | find_command(command, &entry, DO_ABS, path); |
7708 | } |
7709 | |
7710 | switch (entry.cmdtype) { |
7711 | case CMDNORMAL: { |
7712 | int j = entry.u.index; |
7713 | char *p; |
7714 | if (j < 0) { |
7715 | p = command; |
7716 | } else { |
7717 | do { |
7718 | p = path_advance(&path, command); |
7719 | stunalloc(p); |
7720 | } while (--j >= 0); |
7721 | } |
7722 | if (describe_command_verbose) { |
7723 | out1fmt(" is%s %s", |
7724 | (cmdp ? " a tracked alias for" : nullstr), p |
7725 | ); |
7726 | } else { |
7727 | out1str(p); |
7728 | } |
7729 | break; |
7730 | } |
7731 | |
7732 | case CMDFUNCTION: |
7733 | if (describe_command_verbose) { |
7734 | out1str(" is a shell function"); |
7735 | } else { |
7736 | out1str(command); |
7737 | } |
7738 | break; |
7739 | |
7740 | case CMDBUILTIN: |
7741 | if (describe_command_verbose) { |
7742 | out1fmt(" is a %sshell builtin", |
7743 | IS_BUILTIN_SPECIAL(entry.u.cmd) ? |
7744 | "special " : nullstr |
7745 | ); |
7746 | } else { |
7747 | out1str(command); |
7748 | } |
7749 | break; |
7750 | |
7751 | default: |
7752 | if (describe_command_verbose) { |
7753 | out1str(": not found\n"); |
7754 | } |
7755 | return 127; |
7756 | } |
7757 | out: |
7758 | out1str("\n"); |
7759 | return 0; |
7760 | } |
7761 | |
7762 | static int FAST_FUNC |
7763 | typecmd(int argc UNUSED_PARAM, char **argv) |
7764 | { |
7765 | int i = 1; |
7766 | int err = 0; |
7767 | int verbose = 1; |
7768 | |
7769 | /* type -p ... ? (we don't bother checking for 'p') */ |
7770 | if (argv[1] && argv[1][0] == '-') { |
7771 | i++; |
7772 | verbose = 0; |
7773 | } |
7774 | while (argv[i]) { |
7775 | err |= describe_command(argv[i++], verbose); |
7776 | } |
7777 | return err; |
7778 | } |
7779 | |
7780 | #if ENABLE_ASH_CMDCMD |
7781 | static int FAST_FUNC |
7782 | commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
7783 | { |
7784 | int c; |
7785 | enum { |
7786 | VERIFY_BRIEF = 1, |
7787 | VERIFY_VERBOSE = 2, |
7788 | } verify = 0; |
7789 | |
7790 | while ((c = nextopt("pvV")) != '\0') |
7791 | if (c == 'V') |
7792 | verify |= VERIFY_VERBOSE; |
7793 | else if (c == 'v') |
7794 | verify |= VERIFY_BRIEF; |
7795 | #if DEBUG |
7796 | else if (c != 'p') |
7797 | abort(); |
7798 | #endif |
7799 | /* Mimic bash: just "command -v" doesn't complain, it's a nop */ |
7800 | if (verify && (*argptr != NULL)) { |
7801 | return describe_command(*argptr, verify - VERIFY_BRIEF); |
7802 | } |
7803 | |
7804 | return 0; |
7805 | } |
7806 | #endif |
7807 | |
7808 | |
7809 | /* ============ eval.c */ |
7810 | |
7811 | static int funcblocksize; /* size of structures in function */ |
7812 | static int funcstringsize; /* size of strings in node */ |
7813 | static void *funcblock; /* block to allocate function from */ |
7814 | static char *funcstring; /* block to allocate strings from */ |
7815 | |
7816 | /* flags in argument to evaltree */ |
7817 | #define EV_EXIT 01 /* exit after evaluating tree */ |
7818 | #define EV_TESTED 02 /* exit status is checked; ignore -e flag */ |
7819 | #define EV_BACKCMD 04 /* command executing within back quotes */ |
7820 | |
7821 | static const uint8_t nodesize[N_NUMBER] = { |
7822 | [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)), |
7823 | [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)), |
7824 | [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)), |
7825 | [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)), |
7826 | [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)), |
7827 | [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)), |
7828 | [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)), |
7829 | [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)), |
7830 | [NIF ] = SHELL_ALIGN(sizeof(struct nif)), |
7831 | [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)), |
7832 | [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)), |
7833 | [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)), |
7834 | [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)), |
7835 | [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)), |
7836 | [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)), |
7837 | [NARG ] = SHELL_ALIGN(sizeof(struct narg)), |
7838 | [NTO ] = SHELL_ALIGN(sizeof(struct nfile)), |
7839 | #if ENABLE_ASH_BASH_COMPAT |
7840 | [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)), |
7841 | #endif |
7842 | [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)), |
7843 | [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)), |
7844 | [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)), |
7845 | [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)), |
7846 | [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)), |
7847 | [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)), |
7848 | [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)), |
7849 | [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)), |
7850 | [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)), |
7851 | }; |
7852 | |
7853 | static void calcsize(union node *n); |
7854 | |
7855 | static void |
7856 | sizenodelist(struct nodelist *lp) |
7857 | { |
7858 | while (lp) { |
7859 | funcblocksize += SHELL_ALIGN(sizeof(struct nodelist)); |
7860 | calcsize(lp->n); |
7861 | lp = lp->next; |
7862 | } |
7863 | } |
7864 | |
7865 | static void |
7866 | calcsize(union node *n) |
7867 | { |
7868 | if (n == NULL) |
7869 | return; |
7870 | funcblocksize += nodesize[n->type]; |
7871 | switch (n->type) { |
7872 | case NCMD: |
7873 | calcsize(n->ncmd.redirect); |
7874 | calcsize(n->ncmd.args); |
7875 | calcsize(n->ncmd.assign); |
7876 | break; |
7877 | case NPIPE: |
7878 | sizenodelist(n->npipe.cmdlist); |
7879 | break; |
7880 | case NREDIR: |
7881 | case NBACKGND: |
7882 | case NSUBSHELL: |
7883 | calcsize(n->nredir.redirect); |
7884 | calcsize(n->nredir.n); |
7885 | break; |
7886 | case NAND: |
7887 | case NOR: |
7888 | case NSEMI: |
7889 | case NWHILE: |
7890 | case NUNTIL: |
7891 | calcsize(n->nbinary.ch2); |
7892 | calcsize(n->nbinary.ch1); |
7893 | break; |
7894 | case NIF: |
7895 | calcsize(n->nif.elsepart); |
7896 | calcsize(n->nif.ifpart); |
7897 | calcsize(n->nif.test); |
7898 | break; |
7899 | case NFOR: |
7900 | funcstringsize += strlen(n->nfor.var) + 1; |
7901 | calcsize(n->nfor.body); |
7902 | calcsize(n->nfor.args); |
7903 | break; |
7904 | case NCASE: |
7905 | calcsize(n->ncase.cases); |
7906 | calcsize(n->ncase.expr); |
7907 | break; |
7908 | case NCLIST: |
7909 | calcsize(n->nclist.body); |
7910 | calcsize(n->nclist.pattern); |
7911 | calcsize(n->nclist.next); |
7912 | break; |
7913 | case NDEFUN: |
7914 | case NARG: |
7915 | sizenodelist(n->narg.backquote); |
7916 | funcstringsize += strlen(n->narg.text) + 1; |
7917 | calcsize(n->narg.next); |
7918 | break; |
7919 | case NTO: |
7920 | #if ENABLE_ASH_BASH_COMPAT |
7921 | case NTO2: |
7922 | #endif |
7923 | case NCLOBBER: |
7924 | case NFROM: |
7925 | case NFROMTO: |
7926 | case NAPPEND: |
7927 | calcsize(n->nfile.fname); |
7928 | calcsize(n->nfile.next); |
7929 | break; |
7930 | case NTOFD: |
7931 | case NFROMFD: |
7932 | calcsize(n->ndup.vname); |
7933 | calcsize(n->ndup.next); |
7934 | break; |
7935 | case NHERE: |
7936 | case NXHERE: |
7937 | calcsize(n->nhere.doc); |
7938 | calcsize(n->nhere.next); |
7939 | break; |
7940 | case NNOT: |
7941 | calcsize(n->nnot.com); |
7942 | break; |
7943 | }; |
7944 | } |
7945 | |
7946 | static char * |
7947 | nodeckstrdup(char *s) |
7948 | { |
7949 | char *rtn = funcstring; |
7950 | |
7951 | strcpy(funcstring, s); |
7952 | funcstring += strlen(s) + 1; |
7953 | return rtn; |
7954 | } |
7955 | |
7956 | static union node *copynode(union node *); |
7957 | |
7958 | static struct nodelist * |
7959 | copynodelist(struct nodelist *lp) |
7960 | { |
7961 | struct nodelist *start; |
7962 | struct nodelist **lpp; |
7963 | |
7964 | lpp = &start; |
7965 | while (lp) { |
7966 | *lpp = funcblock; |
7967 | funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist)); |
7968 | (*lpp)->n = copynode(lp->n); |
7969 | lp = lp->next; |
7970 | lpp = &(*lpp)->next; |
7971 | } |
7972 | *lpp = NULL; |
7973 | return start; |
7974 | } |
7975 | |
7976 | static union node * |
7977 | copynode(union node *n) |
7978 | { |
7979 | union node *new; |
7980 | |
7981 | if (n == NULL) |
7982 | return NULL; |
7983 | new = funcblock; |
7984 | funcblock = (char *) funcblock + nodesize[n->type]; |
7985 | |
7986 | switch (n->type) { |
7987 | case NCMD: |
7988 | new->ncmd.redirect = copynode(n->ncmd.redirect); |
7989 | new->ncmd.args = copynode(n->ncmd.args); |
7990 | new->ncmd.assign = copynode(n->ncmd.assign); |
7991 | break; |
7992 | case NPIPE: |
7993 | new->npipe.cmdlist = copynodelist(n->npipe.cmdlist); |
7994 | new->npipe.pipe_backgnd = n->npipe.pipe_backgnd; |
7995 | break; |
7996 | case NREDIR: |
7997 | case NBACKGND: |
7998 | case NSUBSHELL: |
7999 | new->nredir.redirect = copynode(n->nredir.redirect); |
8000 | new->nredir.n = copynode(n->nredir.n); |
8001 | break; |
8002 | case NAND: |
8003 | case NOR: |
8004 | case NSEMI: |
8005 | case NWHILE: |
8006 | case NUNTIL: |
8007 | new->nbinary.ch2 = copynode(n->nbinary.ch2); |
8008 | new->nbinary.ch1 = copynode(n->nbinary.ch1); |
8009 | break; |
8010 | case NIF: |
8011 | new->nif.elsepart = copynode(n->nif.elsepart); |
8012 | new->nif.ifpart = copynode(n->nif.ifpart); |
8013 | new->nif.test = copynode(n->nif.test); |
8014 | break; |
8015 | case NFOR: |
8016 | new->nfor.var = nodeckstrdup(n->nfor.var); |
8017 | new->nfor.body = copynode(n->nfor.body); |
8018 | new->nfor.args = copynode(n->nfor.args); |
8019 | break; |
8020 | case NCASE: |
8021 | new->ncase.cases = copynode(n->ncase.cases); |
8022 | new->ncase.expr = copynode(n->ncase.expr); |
8023 | break; |
8024 | case NCLIST: |
8025 | new->nclist.body = copynode(n->nclist.body); |
8026 | new->nclist.pattern = copynode(n->nclist.pattern); |
8027 | new->nclist.next = copynode(n->nclist.next); |
8028 | break; |
8029 | case NDEFUN: |
8030 | case NARG: |
8031 | new->narg.backquote = copynodelist(n->narg.backquote); |
8032 | new->narg.text = nodeckstrdup(n->narg.text); |
8033 | new->narg.next = copynode(n->narg.next); |
8034 | break; |
8035 | case NTO: |
8036 | #if ENABLE_ASH_BASH_COMPAT |
8037 | case NTO2: |
8038 | #endif |
8039 | case NCLOBBER: |
8040 | case NFROM: |
8041 | case NFROMTO: |
8042 | case NAPPEND: |
8043 | new->nfile.fname = copynode(n->nfile.fname); |
8044 | new->nfile.fd = n->nfile.fd; |
8045 | new->nfile.next = copynode(n->nfile.next); |
8046 | break; |
8047 | case NTOFD: |
8048 | case NFROMFD: |
8049 | new->ndup.vname = copynode(n->ndup.vname); |
8050 | new->ndup.dupfd = n->ndup.dupfd; |
8051 | new->ndup.fd = n->ndup.fd; |
8052 | new->ndup.next = copynode(n->ndup.next); |
8053 | break; |
8054 | case NHERE: |
8055 | case NXHERE: |
8056 | new->nhere.doc = copynode(n->nhere.doc); |
8057 | new->nhere.fd = n->nhere.fd; |
8058 | new->nhere.next = copynode(n->nhere.next); |
8059 | break; |
8060 | case NNOT: |
8061 | new->nnot.com = copynode(n->nnot.com); |
8062 | break; |
8063 | }; |
8064 | new->type = n->type; |
8065 | return new; |
8066 | } |
8067 | |
8068 | /* |
8069 | * Make a copy of a parse tree. |
8070 | */ |
8071 | static struct funcnode * |
8072 | copyfunc(union node *n) |
8073 | { |
8074 | struct funcnode *f; |
8075 | size_t blocksize; |
8076 | |
8077 | funcblocksize = offsetof(struct funcnode, n); |
8078 | funcstringsize = 0; |
8079 | calcsize(n); |
8080 | blocksize = funcblocksize; |
8081 | f = ckmalloc(blocksize + funcstringsize); |
8082 | funcblock = (char *) f + offsetof(struct funcnode, n); |
8083 | funcstring = (char *) f + blocksize; |
8084 | copynode(n); |
8085 | f->count = 0; |
8086 | return f; |
8087 | } |
8088 | |
8089 | /* |
8090 | * Define a shell function. |
8091 | */ |
8092 | static void |
8093 | defun(char *name, union node *func) |
8094 | { |
8095 | struct cmdentry entry; |
8096 | |
8097 | INT_OFF; |
8098 | entry.cmdtype = CMDFUNCTION; |
8099 | entry.u.func = copyfunc(func); |
8100 | addcmdentry(name, &entry); |
8101 | INT_ON; |
8102 | } |
8103 | |
8104 | /* Reasons for skipping commands (see comment on breakcmd routine) */ |
8105 | #define SKIPBREAK (1 << 0) |
8106 | #define SKIPCONT (1 << 1) |
8107 | #define SKIPFUNC (1 << 2) |
8108 | #define SKIPFILE (1 << 3) |
8109 | #define SKIPEVAL (1 << 4) |
8110 | static smallint evalskip; /* set to SKIPxxx if we are skipping commands */ |
8111 | static int skipcount; /* number of levels to skip */ |
8112 | static int funcnest; /* depth of function calls */ |
8113 | static int loopnest; /* current loop nesting level */ |
8114 | |
8115 | /* Forward decl way out to parsing code - dotrap needs it */ |
8116 | static int evalstring(char *s, int mask); |
8117 | |
8118 | /* Called to execute a trap. |
8119 | * Single callsite - at the end of evaltree(). |
8120 | * If we return non-zero, exaltree raises EXEXIT exception. |
8121 | * |
8122 | * Perhaps we should avoid entering new trap handlers |
8123 | * while we are executing a trap handler. [is it a TODO?] |
8124 | */ |
8125 | static int |
8126 | dotrap(void) |
8127 | { |
8128 | uint8_t *g; |
8129 | int sig; |
8130 | uint8_t savestatus; |
8131 | |
8132 | savestatus = exitstatus; |
8133 | pending_sig = 0; |
8134 | xbarrier(); |
8135 | |
8136 | TRACE(("dotrap entered\n")); |
8137 | for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) { |
8138 | int want_exexit; |
8139 | char *t; |
8140 | |
8141 | if (*g == 0) |
8142 | continue; |
8143 | t = trap[sig]; |
8144 | /* non-trapped SIGINT is handled separately by raise_interrupt, |
8145 | * don't upset it by resetting gotsig[SIGINT-1] */ |
8146 | if (sig == SIGINT && !t) |
8147 | continue; |
8148 | |
8149 | TRACE(("sig %d is active, will run handler '%s'\n", sig, t)); |
8150 | *g = 0; |
8151 | if (!t) |
8152 | continue; |
8153 | want_exexit = evalstring(t, SKIPEVAL); |
8154 | exitstatus = savestatus; |
8155 | if (want_exexit) { |
8156 | TRACE(("dotrap returns %d\n", want_exexit)); |
8157 | return want_exexit; |
8158 | } |
8159 | } |
8160 | |
8161 | TRACE(("dotrap returns 0\n")); |
8162 | return 0; |
8163 | } |
8164 | |
8165 | /* forward declarations - evaluation is fairly recursive business... */ |
8166 | static void evalloop(union node *, int); |
8167 | static void evalfor(union node *, int); |
8168 | static void evalcase(union node *, int); |
8169 | static void evalsubshell(union node *, int); |
8170 | static void expredir(union node *); |
8171 | static void evalpipe(union node *, int); |
8172 | static void evalcommand(union node *, int); |
8173 | static int evalbltin(const struct builtincmd *, int, char **); |
8174 | static void prehash(union node *); |
8175 | |
8176 | /* |
8177 | * Evaluate a parse tree. The value is left in the global variable |
8178 | * exitstatus. |
8179 | */ |
8180 | static void |
8181 | evaltree(union node *n, int flags) |
8182 | { |
8183 | struct jmploc *volatile savehandler = exception_handler; |
8184 | struct jmploc jmploc; |
8185 | int checkexit = 0; |
8186 | void (*evalfn)(union node *, int); |
8187 | int status; |
8188 | int int_level; |
8189 | |
8190 | SAVE_INT(int_level); |
8191 | |
8192 | if (n == NULL) { |
8193 | TRACE(("evaltree(NULL) called\n")); |
8194 | goto out1; |
8195 | } |
8196 | TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags)); |
8197 | |
8198 | exception_handler = &jmploc; |
8199 | { |
8200 | int err = setjmp(jmploc.loc); |
8201 | if (err) { |
8202 | /* if it was a signal, check for trap handlers */ |
8203 | if (exception_type == EXSIG) { |
8204 | TRACE(("exception %d (EXSIG) in evaltree, err=%d\n", |
8205 | exception_type, err)); |
8206 | goto out; |
8207 | } |
8208 | /* continue on the way out */ |
8209 | TRACE(("exception %d in evaltree, propagating err=%d\n", |
8210 | exception_type, err)); |
8211 | exception_handler = savehandler; |
8212 | longjmp(exception_handler->loc, err); |
8213 | } |
8214 | } |
8215 | |
8216 | switch (n->type) { |
8217 | default: |
8218 | #if DEBUG |
8219 | out1fmt("Node type = %d\n", n->type); |
8220 | fflush_all(); |
8221 | break; |
8222 | #endif |
8223 | case NNOT: |
8224 | evaltree(n->nnot.com, EV_TESTED); |
8225 | status = !exitstatus; |
8226 | goto setstatus; |
8227 | case NREDIR: |
8228 | expredir(n->nredir.redirect); |
8229 | status = redirectsafe(n->nredir.redirect, REDIR_PUSH); |
8230 | if (!status) { |
8231 | evaltree(n->nredir.n, flags & EV_TESTED); |
8232 | status = exitstatus; |
8233 | } |
8234 | popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */); |
8235 | goto setstatus; |
8236 | case NCMD: |
8237 | evalfn = evalcommand; |
8238 | checkexit: |
8239 | if (eflag && !(flags & EV_TESTED)) |
8240 | checkexit = ~0; |
8241 | goto calleval; |
8242 | case NFOR: |
8243 | evalfn = evalfor; |
8244 | goto calleval; |
8245 | case NWHILE: |
8246 | case NUNTIL: |
8247 | evalfn = evalloop; |
8248 | goto calleval; |
8249 | case NSUBSHELL: |
8250 | case NBACKGND: |
8251 | evalfn = evalsubshell; |
8252 | goto calleval; |
8253 | case NPIPE: |
8254 | evalfn = evalpipe; |
8255 | goto checkexit; |
8256 | case NCASE: |
8257 | evalfn = evalcase; |
8258 | goto calleval; |
8259 | case NAND: |
8260 | case NOR: |
8261 | case NSEMI: { |
8262 | |
8263 | #if NAND + 1 != NOR |
8264 | #error NAND + 1 != NOR |
8265 | #endif |
8266 | #if NOR + 1 != NSEMI |
8267 | #error NOR + 1 != NSEMI |
8268 | #endif |
8269 | unsigned is_or = n->type - NAND; |
8270 | evaltree( |
8271 | n->nbinary.ch1, |
8272 | (flags | ((is_or >> 1) - 1)) & EV_TESTED |
8273 | ); |
8274 | if (!exitstatus == is_or) |
8275 | break; |
8276 | if (!evalskip) { |
8277 | n = n->nbinary.ch2; |
8278 | evaln: |
8279 | evalfn = evaltree; |
8280 | calleval: |
8281 | evalfn(n, flags); |
8282 | break; |
8283 | } |
8284 | break; |
8285 | } |
8286 | case NIF: |
8287 | evaltree(n->nif.test, EV_TESTED); |
8288 | if (evalskip) |
8289 | break; |
8290 | if (exitstatus == 0) { |
8291 | n = n->nif.ifpart; |
8292 | goto evaln; |
8293 | } |
8294 | if (n->nif.elsepart) { |
8295 | n = n->nif.elsepart; |
8296 | goto evaln; |
8297 | } |
8298 | goto success; |
8299 | case NDEFUN: |
8300 | defun(n->narg.text, n->narg.next); |
8301 | success: |
8302 | status = 0; |
8303 | setstatus: |
8304 | exitstatus = status; |
8305 | break; |
8306 | } |
8307 | |
8308 | out: |
8309 | exception_handler = savehandler; |
8310 | out1: |
8311 | if (checkexit & exitstatus) |
8312 | evalskip |= SKIPEVAL; |
8313 | else if (pending_sig && dotrap()) |
8314 | goto exexit; |
8315 | |
8316 | if (flags & EV_EXIT) { |
8317 | exexit: |
8318 | raise_exception(EXEXIT); |
8319 | } |
8320 | |
8321 | RESTORE_INT(int_level); |
8322 | TRACE(("leaving evaltree (no interrupts)\n")); |
8323 | } |
8324 | |
8325 | #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3) |
8326 | static |
8327 | #endif |
8328 | void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__)); |
8329 | |
8330 | static void |
8331 | evalloop(union node *n, int flags) |
8332 | { |
8333 | int status; |
8334 | |
8335 | loopnest++; |
8336 | status = 0; |
8337 | flags &= EV_TESTED; |
8338 | for (;;) { |
8339 | int i; |
8340 | |
8341 | evaltree(n->nbinary.ch1, EV_TESTED); |
8342 | if (evalskip) { |
8343 | skipping: |
8344 | if (evalskip == SKIPCONT && --skipcount <= 0) { |
8345 | evalskip = 0; |
8346 | continue; |
8347 | } |
8348 | if (evalskip == SKIPBREAK && --skipcount <= 0) |
8349 | evalskip = 0; |
8350 | break; |
8351 | } |
8352 | i = exitstatus; |
8353 | if (n->type != NWHILE) |
8354 | i = !i; |
8355 | if (i != 0) |
8356 | break; |
8357 | evaltree(n->nbinary.ch2, flags); |
8358 | status = exitstatus; |
8359 | if (evalskip) |
8360 | goto skipping; |
8361 | } |
8362 | loopnest--; |
8363 | exitstatus = status; |
8364 | } |
8365 | |
8366 | static void |
8367 | evalfor(union node *n, int flags) |
8368 | { |
8369 | struct arglist arglist; |
8370 | union node *argp; |
8371 | struct strlist *sp; |
8372 | struct stackmark smark; |
8373 | |
8374 | setstackmark(&smark); |
8375 | arglist.list = NULL; |
8376 | arglist.lastp = &arglist.list; |
8377 | for (argp = n->nfor.args; argp; argp = argp->narg.next) { |
8378 | expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD); |
8379 | /* XXX */ |
8380 | if (evalskip) |
8381 | goto out; |
8382 | } |
8383 | *arglist.lastp = NULL; |
8384 | |
8385 | exitstatus = 0; |
8386 | loopnest++; |
8387 | flags &= EV_TESTED; |
8388 | for (sp = arglist.list; sp; sp = sp->next) { |
8389 | setvar(n->nfor.var, sp->text, 0); |
8390 | evaltree(n->nfor.body, flags); |
8391 | if (evalskip) { |
8392 | if (evalskip == SKIPCONT && --skipcount <= 0) { |
8393 | evalskip = 0; |
8394 | continue; |
8395 | } |
8396 | if (evalskip == SKIPBREAK && --skipcount <= 0) |
8397 | evalskip = 0; |
8398 | break; |
8399 | } |
8400 | } |
8401 | loopnest--; |
8402 | out: |
8403 | popstackmark(&smark); |
8404 | } |
8405 | |
8406 | static void |
8407 | evalcase(union node *n, int flags) |
8408 | { |
8409 | union node *cp; |
8410 | union node *patp; |
8411 | struct arglist arglist; |
8412 | struct stackmark smark; |
8413 | |
8414 | setstackmark(&smark); |
8415 | arglist.list = NULL; |
8416 | arglist.lastp = &arglist.list; |
8417 | expandarg(n->ncase.expr, &arglist, EXP_TILDE); |
8418 | exitstatus = 0; |
8419 | for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) { |
8420 | for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) { |
8421 | if (casematch(patp, arglist.list->text)) { |
8422 | if (evalskip == 0) { |
8423 | evaltree(cp->nclist.body, flags); |
8424 | } |
8425 | goto out; |
8426 | } |
8427 | } |
8428 | } |
8429 | out: |
8430 | popstackmark(&smark); |
8431 | } |
8432 | |
8433 | /* |
8434 | * Kick off a subshell to evaluate a tree. |
8435 | */ |
8436 | static void |
8437 | evalsubshell(union node *n, int flags) |
8438 | { |
8439 | struct job *jp; |
8440 | int backgnd = (n->type == NBACKGND); |
8441 | int status; |
8442 | |
8443 | expredir(n->nredir.redirect); |
8444 | if (!backgnd && (flags & EV_EXIT) && !may_have_traps) |
8445 | goto nofork; |
8446 | INT_OFF; |
8447 | jp = makejob(/*n,*/ 1); |
8448 | if (forkshell(jp, n, backgnd) == 0) { |
8449 | /* child */ |
8450 | INT_ON; |
8451 | flags |= EV_EXIT; |
8452 | if (backgnd) |
8453 | flags &= ~EV_TESTED; |
8454 | nofork: |
8455 | redirect(n->nredir.redirect, 0); |
8456 | evaltreenr(n->nredir.n, flags); |
8457 | /* never returns */ |
8458 | } |
8459 | status = 0; |
8460 | if (!backgnd) |
8461 | status = waitforjob(jp); |
8462 | exitstatus = status; |
8463 | INT_ON; |
8464 | } |
8465 | |
8466 | /* |
8467 | * Compute the names of the files in a redirection list. |
8468 | */ |
8469 | static void fixredir(union node *, const char *, int); |
8470 | static void |
8471 | expredir(union node *n) |
8472 | { |
8473 | union node *redir; |
8474 | |
8475 | for (redir = n; redir; redir = redir->nfile.next) { |
8476 | struct arglist fn; |
8477 | |
8478 | fn.list = NULL; |
8479 | fn.lastp = &fn.list; |
8480 | switch (redir->type) { |
8481 | case NFROMTO: |
8482 | case NFROM: |
8483 | case NTO: |
8484 | #if ENABLE_ASH_BASH_COMPAT |
8485 | case NTO2: |
8486 | #endif |
8487 | case NCLOBBER: |
8488 | case NAPPEND: |
8489 | expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR); |
8490 | #if ENABLE_ASH_BASH_COMPAT |
8491 | store_expfname: |
8492 | #endif |
8493 | redir->nfile.expfname = fn.list->text; |
8494 | break; |
8495 | case NFROMFD: |
8496 | case NTOFD: /* >& */ |
8497 | if (redir->ndup.vname) { |
8498 | expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE); |
8499 | if (fn.list == NULL) |
8500 | ash_msg_and_raise_error("redir error"); |
8501 | #if ENABLE_ASH_BASH_COMPAT |
8502 | //FIXME: we used expandarg with different args! |
8503 | if (!isdigit_str9(fn.list->text)) { |
8504 | /* >&file, not >&fd */ |
8505 | if (redir->nfile.fd != 1) /* 123>&file - BAD */ |
8506 | ash_msg_and_raise_error("redir error"); |
8507 | redir->type = NTO2; |
8508 | goto store_expfname; |
8509 | } |
8510 | #endif |
8511 | fixredir(redir, fn.list->text, 1); |
8512 | } |
8513 | break; |
8514 | } |
8515 | } |
8516 | } |
8517 | |
8518 | /* |
8519 | * Evaluate a pipeline. All the processes in the pipeline are children |
8520 | * of the process creating the pipeline. (This differs from some versions |
8521 | * of the shell, which make the last process in a pipeline the parent |
8522 | * of all the rest.) |
8523 | */ |
8524 | static void |
8525 | evalpipe(union node *n, int flags) |
8526 | { |
8527 | struct job *jp; |
8528 | struct nodelist *lp; |
8529 | int pipelen; |
8530 | int prevfd; |
8531 | int pip[2]; |
8532 | |
8533 | TRACE(("evalpipe(0x%lx) called\n", (long)n)); |
8534 | pipelen = 0; |
8535 | for (lp = n->npipe.cmdlist; lp; lp = lp->next) |
8536 | pipelen++; |
8537 | flags |= EV_EXIT; |
8538 | INT_OFF; |
8539 | jp = makejob(/*n,*/ pipelen); |
8540 | prevfd = -1; |
8541 | for (lp = n->npipe.cmdlist; lp; lp = lp->next) { |
8542 | prehash(lp->n); |
8543 | pip[1] = -1; |
8544 | if (lp->next) { |
8545 | if (pipe(pip) < 0) { |
8546 | close(prevfd); |
8547 | ash_msg_and_raise_error("pipe call failed"); |
8548 | } |
8549 | } |
8550 | if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) { |
8551 | INT_ON; |
8552 | if (pip[1] >= 0) { |
8553 | close(pip[0]); |
8554 | } |
8555 | if (prevfd > 0) { |
8556 | dup2(prevfd, 0); |
8557 | close(prevfd); |
8558 | } |
8559 | if (pip[1] > 1) { |
8560 | dup2(pip[1], 1); |
8561 | close(pip[1]); |
8562 | } |
8563 | evaltreenr(lp->n, flags); |
8564 | /* never returns */ |
8565 | } |
8566 | if (prevfd >= 0) |
8567 | close(prevfd); |
8568 | prevfd = pip[0]; |
8569 | /* Don't want to trigger debugging */ |
8570 | if (pip[1] != -1) |
8571 | close(pip[1]); |
8572 | } |
8573 | if (n->npipe.pipe_backgnd == 0) { |
8574 | exitstatus = waitforjob(jp); |
8575 | TRACE(("evalpipe: job done exit status %d\n", exitstatus)); |
8576 | } |
8577 | INT_ON; |
8578 | } |
8579 | |
8580 | /* |
8581 | * Controls whether the shell is interactive or not. |
8582 | */ |
8583 | static void |
8584 | setinteractive(int on) |
8585 | { |
8586 | static smallint is_interactive; |
8587 | |
8588 | if (++on == is_interactive) |
8589 | return; |
8590 | is_interactive = on; |
8591 | setsignal(SIGINT); |
8592 | setsignal(SIGQUIT); |
8593 | setsignal(SIGTERM); |
8594 | #if !ENABLE_FEATURE_SH_EXTRA_QUIET |
8595 | if (is_interactive > 1) { |
8596 | /* Looks like they want an interactive shell */ |
8597 | static smallint did_banner; |
8598 | |
8599 | if (!did_banner) { |
8600 | /* note: ash and hush share this string */ |
8601 | out1fmt("\n\n%s %s\n" |
8602 | "Enter 'help' for a list of built-in commands." |
8603 | "\n\n", |
8604 | bb_banner, |
8605 | "built-in shell (ash)" |
8606 | ); |
8607 | did_banner = 1; |
8608 | } |
8609 | } |
8610 | #endif |
8611 | } |
8612 | |
8613 | static void |
8614 | optschanged(void) |
8615 | { |
8616 | #if DEBUG |
8617 | opentrace(); |
8618 | #endif |
8619 | setinteractive(iflag); |
8620 | setjobctl(mflag); |
8621 | #if ENABLE_FEATURE_EDITING_VI |
8622 | if (viflag) |
8623 | line_input_state->flags |= VI_MODE; |
8624 | else |
8625 | line_input_state->flags &= ~VI_MODE; |
8626 | #else |
8627 | viflag = 0; /* forcibly keep the option off */ |
8628 | #endif |
8629 | } |
8630 | |
8631 | static struct localvar *localvars; |
8632 | |
8633 | /* |
8634 | * Called after a function returns. |
8635 | * Interrupts must be off. |
8636 | */ |
8637 | static void |
8638 | poplocalvars(void) |
8639 | { |
8640 | struct localvar *lvp; |
8641 | struct var *vp; |
8642 | |
8643 | while ((lvp = localvars) != NULL) { |
8644 | localvars = lvp->next; |
8645 | vp = lvp->vp; |
8646 | TRACE(("poplocalvar %s\n", vp ? vp->text : "-")); |
8647 | if (vp == NULL) { /* $- saved */ |
8648 | memcpy(optlist, lvp->text, sizeof(optlist)); |
8649 | free((char*)lvp->text); |
8650 | optschanged(); |
8651 | } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) { |
8652 | unsetvar(vp->var_text); |
8653 | } else { |
8654 | if (vp->var_func) |
8655 | vp->var_func(var_end(lvp->text)); |
8656 | if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) |
8657 | free((char*)vp->var_text); |
8658 | vp->flags = lvp->flags; |
8659 | vp->var_text = lvp->text; |
8660 | } |
8661 | free(lvp); |
8662 | } |
8663 | } |
8664 | |
8665 | static int |
8666 | evalfun(struct funcnode *func, int argc, char **argv, int flags) |
8667 | { |
8668 | volatile struct shparam saveparam; |
8669 | struct localvar *volatile savelocalvars; |
8670 | struct jmploc *volatile savehandler; |
8671 | struct jmploc jmploc; |
8672 | int e; |
8673 | |
8674 | saveparam = shellparam; |
8675 | savelocalvars = localvars; |
8676 | e = setjmp(jmploc.loc); |
8677 | if (e) { |
8678 | goto funcdone; |
8679 | } |
8680 | INT_OFF; |
8681 | savehandler = exception_handler; |
8682 | exception_handler = &jmploc; |
8683 | localvars = NULL; |
8684 | shellparam.malloced = 0; |
8685 | func->count++; |
8686 | funcnest++; |
8687 | INT_ON; |
8688 | shellparam.nparam = argc - 1; |
8689 | shellparam.p = argv + 1; |
8690 | #if ENABLE_ASH_GETOPTS |
8691 | shellparam.optind = 1; |
8692 | shellparam.optoff = -1; |
8693 | #endif |
8694 | evaltree(&func->n, flags & EV_TESTED); |
8695 | funcdone: |
8696 | INT_OFF; |
8697 | funcnest--; |
8698 | freefunc(func); |
8699 | poplocalvars(); |
8700 | localvars = savelocalvars; |
8701 | freeparam(&shellparam); |
8702 | shellparam = saveparam; |
8703 | exception_handler = savehandler; |
8704 | INT_ON; |
8705 | evalskip &= ~SKIPFUNC; |
8706 | return e; |
8707 | } |
8708 | |
8709 | #if ENABLE_ASH_CMDCMD |
8710 | static char ** |
8711 | parse_command_args(char **argv, const char **path) |
8712 | { |
8713 | char *cp, c; |
8714 | |
8715 | for (;;) { |
8716 | cp = *++argv; |
8717 | if (!cp) |
8718 | return 0; |
8719 | if (*cp++ != '-') |
8720 | break; |
8721 | c = *cp++; |
8722 | if (!c) |
8723 | break; |
8724 | if (c == '-' && !*cp) { |
8725 | argv++; |
8726 | break; |
8727 | } |
8728 | do { |
8729 | switch (c) { |
8730 | case 'p': |
8731 | *path = bb_default_path; |
8732 | break; |
8733 | default: |
8734 | /* run 'typecmd' for other options */ |
8735 | return 0; |
8736 | } |
8737 | c = *cp++; |
8738 | } while (c); |
8739 | } |
8740 | return argv; |
8741 | } |
8742 | #endif |
8743 | |
8744 | /* |
8745 | * Make a variable a local variable. When a variable is made local, it's |
8746 | * value and flags are saved in a localvar structure. The saved values |
8747 | * will be restored when the shell function returns. We handle the name |
8748 | * "-" as a special case. |
8749 | */ |
8750 | static void |
8751 | mklocal(char *name) |
8752 | { |
8753 | struct localvar *lvp; |
8754 | struct var **vpp; |
8755 | struct var *vp; |
8756 | |
8757 | INT_OFF; |
8758 | lvp = ckzalloc(sizeof(struct localvar)); |
8759 | if (LONE_DASH(name)) { |
8760 | char *p; |
8761 | p = ckmalloc(sizeof(optlist)); |
8762 | lvp->text = memcpy(p, optlist, sizeof(optlist)); |
8763 | vp = NULL; |
8764 | } else { |
8765 | char *eq; |
8766 | |
8767 | vpp = hashvar(name); |
8768 | vp = *findvar(vpp, name); |
8769 | eq = strchr(name, '='); |
8770 | if (vp == NULL) { |
8771 | if (eq) |
8772 | setvareq(name, VSTRFIXED); |
8773 | else |
8774 | setvar(name, NULL, VSTRFIXED); |
8775 | vp = *vpp; /* the new variable */ |
8776 | lvp->flags = VUNSET; |
8777 | } else { |
8778 | lvp->text = vp->var_text; |
8779 | lvp->flags = vp->flags; |
8780 | vp->flags |= VSTRFIXED|VTEXTFIXED; |
8781 | if (eq) |
8782 | setvareq(name, 0); |
8783 | } |
8784 | } |
8785 | lvp->vp = vp; |
8786 | lvp->next = localvars; |
8787 | localvars = lvp; |
8788 | INT_ON; |
8789 | } |
8790 | |
8791 | /* |
8792 | * The "local" command. |
8793 | */ |
8794 | static int FAST_FUNC |
8795 | localcmd(int argc UNUSED_PARAM, char **argv) |
8796 | { |
8797 | char *name; |
8798 | |
8799 | argv = argptr; |
8800 | while ((name = *argv++) != NULL) { |
8801 | mklocal(name); |
8802 | } |
8803 | return 0; |
8804 | } |
8805 | |
8806 | static int FAST_FUNC |
8807 | falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
8808 | { |
8809 | return 1; |
8810 | } |
8811 | |
8812 | static int FAST_FUNC |
8813 | truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
8814 | { |
8815 | return 0; |
8816 | } |
8817 | |
8818 | static int FAST_FUNC |
8819 | execcmd(int argc UNUSED_PARAM, char **argv) |
8820 | { |
8821 | if (argv[1]) { |
8822 | iflag = 0; /* exit on error */ |
8823 | mflag = 0; |
8824 | optschanged(); |
8825 | shellexec(argv + 1, pathval(), 0); |
8826 | } |
8827 | return 0; |
8828 | } |
8829 | |
8830 | /* |
8831 | * The return command. |
8832 | */ |
8833 | static int FAST_FUNC |
8834 | returncmd(int argc UNUSED_PARAM, char **argv) |
8835 | { |
8836 | /* |
8837 | * If called outside a function, do what ksh does; |
8838 | * skip the rest of the file. |
8839 | */ |
8840 | evalskip = funcnest ? SKIPFUNC : SKIPFILE; |
8841 | return argv[1] ? number(argv[1]) : exitstatus; |
8842 | } |
8843 | |
8844 | /* Forward declarations for builtintab[] */ |
8845 | static int breakcmd(int, char **) FAST_FUNC; |
8846 | static int dotcmd(int, char **) FAST_FUNC; |
8847 | static int evalcmd(int, char **) FAST_FUNC; |
8848 | static int exitcmd(int, char **) FAST_FUNC; |
8849 | static int exportcmd(int, char **) FAST_FUNC; |
8850 | #if ENABLE_ASH_GETOPTS |
8851 | static int getoptscmd(int, char **) FAST_FUNC; |
8852 | #endif |
8853 | #if !ENABLE_FEATURE_SH_EXTRA_QUIET |
8854 | static int helpcmd(int, char **) FAST_FUNC; |
8855 | #endif |
8856 | #if ENABLE_SH_MATH_SUPPORT |
8857 | static int letcmd(int, char **) FAST_FUNC; |
8858 | #endif |
8859 | static int readcmd(int, char **) FAST_FUNC; |
8860 | static int setcmd(int, char **) FAST_FUNC; |
8861 | static int shiftcmd(int, char **) FAST_FUNC; |
8862 | static int timescmd(int, char **) FAST_FUNC; |
8863 | static int trapcmd(int, char **) FAST_FUNC; |
8864 | static int umaskcmd(int, char **) FAST_FUNC; |
8865 | static int unsetcmd(int, char **) FAST_FUNC; |
8866 | static int ulimitcmd(int, char **) FAST_FUNC; |
8867 | |
8868 | #define BUILTIN_NOSPEC "0" |
8869 | #define BUILTIN_SPECIAL "1" |
8870 | #define BUILTIN_REGULAR "2" |
8871 | #define BUILTIN_SPEC_REG "3" |
8872 | #define BUILTIN_ASSIGN "4" |
8873 | #define BUILTIN_SPEC_ASSG "5" |
8874 | #define BUILTIN_REG_ASSG "6" |
8875 | #define BUILTIN_SPEC_REG_ASSG "7" |
8876 | |
8877 | /* Stubs for calling non-FAST_FUNC's */ |
8878 | #if ENABLE_ASH_BUILTIN_ECHO |
8879 | static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); } |
8880 | #endif |
8881 | #if ENABLE_ASH_BUILTIN_PRINTF |
8882 | static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); } |
8883 | #endif |
8884 | #if ENABLE_ASH_BUILTIN_TEST |
8885 | static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); } |
8886 | #endif |
8887 | |
8888 | /* Keep these in proper order since it is searched via bsearch() */ |
8889 | static const struct builtincmd builtintab[] = { |
8890 | { BUILTIN_SPEC_REG "." , dotcmd }, |
8891 | { BUILTIN_SPEC_REG ":" , truecmd }, |
8892 | #if ENABLE_ASH_BUILTIN_TEST |
8893 | { BUILTIN_REGULAR "[" , testcmd }, |
8894 | #if ENABLE_ASH_BASH_COMPAT |
8895 | { BUILTIN_REGULAR "[[" , testcmd }, |
8896 | #endif |
8897 | #endif |
8898 | #if ENABLE_ASH_ALIAS |
8899 | { BUILTIN_REG_ASSG "alias" , aliascmd }, |
8900 | #endif |
8901 | #if JOBS |
8902 | { BUILTIN_REGULAR "bg" , fg_bgcmd }, |
8903 | #endif |
8904 | { BUILTIN_SPEC_REG "break" , breakcmd }, |
8905 | { BUILTIN_REGULAR "cd" , cdcmd }, |
8906 | { BUILTIN_NOSPEC "chdir" , cdcmd }, |
8907 | #if ENABLE_ASH_CMDCMD |
8908 | { BUILTIN_REGULAR "command" , commandcmd }, |
8909 | #endif |
8910 | { BUILTIN_SPEC_REG "continue", breakcmd }, |
8911 | #if ENABLE_ASH_BUILTIN_ECHO |
8912 | { BUILTIN_REGULAR "echo" , echocmd }, |
8913 | #endif |
8914 | { BUILTIN_SPEC_REG "eval" , evalcmd }, |
8915 | { BUILTIN_SPEC_REG "exec" , execcmd }, |
8916 | { BUILTIN_SPEC_REG "exit" , exitcmd }, |
8917 | { BUILTIN_SPEC_REG_ASSG "export" , exportcmd }, |
8918 | { BUILTIN_REGULAR "false" , falsecmd }, |
8919 | #if JOBS |
8920 | { BUILTIN_REGULAR "fg" , fg_bgcmd }, |
8921 | #endif |
8922 | #if ENABLE_ASH_GETOPTS |
8923 | { BUILTIN_REGULAR "getopts" , getoptscmd }, |
8924 | #endif |
8925 | { BUILTIN_NOSPEC "hash" , hashcmd }, |
8926 | #if !ENABLE_FEATURE_SH_EXTRA_QUIET |
8927 | { BUILTIN_NOSPEC "help" , helpcmd }, |
8928 | #endif |
8929 | #if JOBS |
8930 | { BUILTIN_REGULAR "jobs" , jobscmd }, |
8931 | { BUILTIN_REGULAR "kill" , killcmd }, |
8932 | #endif |
8933 | #if ENABLE_SH_MATH_SUPPORT |
8934 | { BUILTIN_NOSPEC "let" , letcmd }, |
8935 | #endif |
8936 | { BUILTIN_ASSIGN "local" , localcmd }, |
8937 | #if ENABLE_ASH_BUILTIN_PRINTF |
8938 | { BUILTIN_REGULAR "printf" , printfcmd }, |
8939 | #endif |
8940 | { BUILTIN_NOSPEC "pwd" , pwdcmd }, |
8941 | { BUILTIN_REGULAR "read" , readcmd }, |
8942 | { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd }, |
8943 | { BUILTIN_SPEC_REG "return" , returncmd }, |
8944 | { BUILTIN_SPEC_REG "set" , setcmd }, |
8945 | { BUILTIN_SPEC_REG "shift" , shiftcmd }, |
8946 | #if ENABLE_ASH_BASH_COMPAT |
8947 | { BUILTIN_SPEC_REG "source" , dotcmd }, |
8948 | #endif |
8949 | #if ENABLE_ASH_BUILTIN_TEST |
8950 | { BUILTIN_REGULAR "test" , testcmd }, |
8951 | #endif |
8952 | { BUILTIN_SPEC_REG "times" , timescmd }, |
8953 | { BUILTIN_SPEC_REG "trap" , trapcmd }, |
8954 | { BUILTIN_REGULAR "true" , truecmd }, |
8955 | { BUILTIN_NOSPEC "type" , typecmd }, |
8956 | { BUILTIN_NOSPEC "ulimit" , ulimitcmd }, |
8957 | { BUILTIN_REGULAR "umask" , umaskcmd }, |
8958 | #if ENABLE_ASH_ALIAS |
8959 | { BUILTIN_REGULAR "unalias" , unaliascmd }, |
8960 | #endif |
8961 | { BUILTIN_SPEC_REG "unset" , unsetcmd }, |
8962 | { BUILTIN_REGULAR "wait" , waitcmd }, |
8963 | }; |
8964 | |
8965 | /* Should match the above table! */ |
8966 | #define COMMANDCMD (builtintab + \ |
8967 | 2 + \ |
8968 | 1 * ENABLE_ASH_BUILTIN_TEST + \ |
8969 | 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \ |
8970 | 1 * ENABLE_ASH_ALIAS + \ |
8971 | 1 * ENABLE_ASH_JOB_CONTROL + \ |
8972 | 3) |
8973 | #define EXECCMD (builtintab + \ |
8974 | 2 + \ |
8975 | 1 * ENABLE_ASH_BUILTIN_TEST + \ |
8976 | 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \ |
8977 | 1 * ENABLE_ASH_ALIAS + \ |
8978 | 1 * ENABLE_ASH_JOB_CONTROL + \ |
8979 | 3 + \ |
8980 | 1 * ENABLE_ASH_CMDCMD + \ |
8981 | 1 + \ |
8982 | ENABLE_ASH_BUILTIN_ECHO + \ |
8983 | 1) |
8984 | |
8985 | /* |
8986 | * Search the table of builtin commands. |
8987 | */ |
8988 | static struct builtincmd * |
8989 | find_builtin(const char *name) |
8990 | { |
8991 | struct builtincmd *bp; |
8992 | |
8993 | bp = bsearch( |
8994 | name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]), |
8995 | pstrcmp |
8996 | ); |
8997 | return bp; |
8998 | } |
8999 | |
9000 | /* |
9001 | * Execute a simple command. |
9002 | */ |
9003 | static int |
9004 | isassignment(const char *p) |
9005 | { |
9006 | const char *q = endofname(p); |
9007 | if (p == q) |
9008 | return 0; |
9009 | return *q == '='; |
9010 | } |
9011 | static int FAST_FUNC |
9012 | bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
9013 | { |
9014 | /* Preserve exitstatus of a previous possible redirection |
9015 | * as POSIX mandates */ |
9016 | return back_exitstatus; |
9017 | } |
9018 | static void |
9019 | evalcommand(union node *cmd, int flags) |
9020 | { |
9021 | static const struct builtincmd null_bltin = { |
9022 | "\0\0", bltincmd /* why three NULs? */ |
9023 | }; |
9024 | struct stackmark smark; |
9025 | union node *argp; |
9026 | struct arglist arglist; |
9027 | struct arglist varlist; |
9028 | char **argv; |
9029 | int argc; |
9030 | const struct strlist *sp; |
9031 | struct cmdentry cmdentry; |
9032 | struct job *jp; |
9033 | char *lastarg; |
9034 | const char *path; |
9035 | int spclbltin; |
9036 | int status; |
9037 | char **nargv; |
9038 | struct builtincmd *bcmd; |
9039 | smallint cmd_is_exec; |
9040 | smallint pseudovarflag = 0; |
9041 | |
9042 | /* First expand the arguments. */ |
9043 | TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags)); |
9044 | setstackmark(&smark); |
9045 | back_exitstatus = 0; |
9046 | |
9047 | cmdentry.cmdtype = CMDBUILTIN; |
9048 | cmdentry.u.cmd = &null_bltin; |
9049 | varlist.lastp = &varlist.list; |
9050 | *varlist.lastp = NULL; |
9051 | arglist.lastp = &arglist.list; |
9052 | *arglist.lastp = NULL; |
9053 | |
9054 | argc = 0; |
9055 | if (cmd->ncmd.args) { |
9056 | bcmd = find_builtin(cmd->ncmd.args->narg.text); |
9057 | pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd); |
9058 | } |
9059 | |
9060 | for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) { |
9061 | struct strlist **spp; |
9062 | |
9063 | spp = arglist.lastp; |
9064 | if (pseudovarflag && isassignment(argp->narg.text)) |
9065 | expandarg(argp, &arglist, EXP_VARTILDE); |
9066 | else |
9067 | expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); |
9068 | |
9069 | for (sp = *spp; sp; sp = sp->next) |
9070 | argc++; |
9071 | } |
9072 | |
9073 | argv = nargv = stalloc(sizeof(char *) * (argc + 1)); |
9074 | for (sp = arglist.list; sp; sp = sp->next) { |
9075 | TRACE(("evalcommand arg: %s\n", sp->text)); |
9076 | *nargv++ = sp->text; |
9077 | } |
9078 | *nargv = NULL; |
9079 | |
9080 | lastarg = NULL; |
9081 | if (iflag && funcnest == 0 && argc > 0) |
9082 | lastarg = nargv[-1]; |
9083 | |
9084 | preverrout_fd = 2; |
9085 | expredir(cmd->ncmd.redirect); |
9086 | status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2); |
9087 | |
9088 | path = vpath.var_text; |
9089 | for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) { |
9090 | struct strlist **spp; |
9091 | char *p; |
9092 | |
9093 | spp = varlist.lastp; |
9094 | expandarg(argp, &varlist, EXP_VARTILDE); |
9095 | |
9096 | /* |
9097 | * Modify the command lookup path, if a PATH= assignment |
9098 | * is present |
9099 | */ |
9100 | p = (*spp)->text; |
9101 | if (varcmp(p, path) == 0) |
9102 | path = p; |
9103 | } |
9104 | |
9105 | /* Print the command if xflag is set. */ |
9106 | if (xflag) { |
9107 | int n; |
9108 | const char *p = " %s" + 1; |
9109 | |
9110 | fdprintf(preverrout_fd, p, expandstr(ps4val())); |
9111 | sp = varlist.list; |
9112 | for (n = 0; n < 2; n++) { |
9113 | while (sp) { |
9114 | fdprintf(preverrout_fd, p, sp->text); |
9115 | sp = sp->next; |
9116 | p = " %s"; |
9117 | } |
9118 | sp = arglist.list; |
9119 | } |
9120 | safe_write(preverrout_fd, "\n", 1); |
9121 | } |
9122 | |
9123 | cmd_is_exec = 0; |
9124 | spclbltin = -1; |
9125 | |
9126 | /* Now locate the command. */ |
9127 | if (argc) { |
9128 | const char *oldpath; |
9129 | int cmd_flag = DO_ERR; |
9130 | |
9131 | path += 5; |
9132 | oldpath = path; |
9133 | for (;;) { |
9134 | find_command(argv[0], &cmdentry, cmd_flag, path); |
9135 | if (cmdentry.cmdtype == CMDUNKNOWN) { |
9136 | flush_stdout_stderr(); |
9137 | status = 127; |
9138 | goto bail; |
9139 | } |
9140 | |
9141 | /* implement bltin and command here */ |
9142 | if (cmdentry.cmdtype != CMDBUILTIN) |
9143 | break; |
9144 | if (spclbltin < 0) |
9145 | spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd); |
9146 | if (cmdentry.u.cmd == EXECCMD) |
9147 | cmd_is_exec = 1; |
9148 | #if ENABLE_ASH_CMDCMD |
9149 | if (cmdentry.u.cmd == COMMANDCMD) { |
9150 | path = oldpath; |
9151 | nargv = parse_command_args(argv, &path); |
9152 | if (!nargv) |
9153 | break; |
9154 | argc -= nargv - argv; |
9155 | argv = nargv; |
9156 | cmd_flag |= DO_NOFUNC; |
9157 | } else |
9158 | #endif |
9159 | break; |
9160 | } |
9161 | } |
9162 | |
9163 | if (status) { |
9164 | /* We have a redirection error. */ |
9165 | if (spclbltin > 0) |
9166 | raise_exception(EXERROR); |
9167 | bail: |
9168 | exitstatus = status; |
9169 | goto out; |
9170 | } |
9171 | |
9172 | /* Execute the command. */ |
9173 | switch (cmdentry.cmdtype) { |
9174 | default: { |
9175 | |
9176 | #if ENABLE_FEATURE_SH_NOFORK |
9177 | /* (1) BUG: if variables are set, we need to fork, or save/restore them |
9178 | * around run_nofork_applet() call. |
9179 | * (2) Should this check also be done in forkshell()? |
9180 | * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...) |
9181 | */ |
9182 | /* find_command() encodes applet_no as (-2 - applet_no) */ |
9183 | int applet_no = (- cmdentry.u.index - 2); |
9184 | if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) { |
9185 | listsetvar(varlist.list, VEXPORT|VSTACK); |
9186 | /* run <applet>_main() */ |
9187 | exitstatus = run_nofork_applet(applet_no, argv); |
9188 | break; |
9189 | } |
9190 | #endif |
9191 | /* Can we avoid forking off? For example, very last command |
9192 | * in a script or a subshell does not need forking, |
9193 | * we can just exec it. |
9194 | */ |
9195 | if (!(flags & EV_EXIT) || may_have_traps) { |
9196 | /* No, forking off a child is necessary */ |
9197 | INT_OFF; |
9198 | jp = makejob(/*cmd,*/ 1); |
9199 | if (forkshell(jp, cmd, FORK_FG) != 0) { |
9200 | /* parent */ |
9201 | exitstatus = waitforjob(jp); |
9202 | INT_ON; |
9203 | TRACE(("forked child exited with %d\n", exitstatus)); |
9204 | break; |
9205 | } |
9206 | /* child */ |
9207 | FORCE_INT_ON; |
9208 | /* fall through to exec'ing external program */ |
9209 | } |
9210 | listsetvar(varlist.list, VEXPORT|VSTACK); |
9211 | shellexec(argv, path, cmdentry.u.index); |
9212 | /* NOTREACHED */ |
9213 | } /* default */ |
9214 | case CMDBUILTIN: |
9215 | cmdenviron = varlist.list; |
9216 | if (cmdenviron) { |
9217 | struct strlist *list = cmdenviron; |
9218 | int i = VNOSET; |
9219 | if (spclbltin > 0 || argc == 0) { |
9220 | i = 0; |
9221 | if (cmd_is_exec && argc > 1) |
9222 | i = VEXPORT; |
9223 | } |
9224 | listsetvar(list, i); |
9225 | } |
9226 | /* Tight loop with builtins only: |
9227 | * "while kill -0 $child; do true; done" |
9228 | * will never exit even if $child died, unless we do this |
9229 | * to reap the zombie and make kill detect that it's gone: */ |
9230 | dowait(DOWAIT_NONBLOCK, NULL); |
9231 | |
9232 | if (evalbltin(cmdentry.u.cmd, argc, argv)) { |
9233 | int exit_status; |
9234 | int i = exception_type; |
9235 | if (i == EXEXIT) |
9236 | goto raise; |
9237 | exit_status = 2; |
9238 | if (i == EXINT) |
9239 | exit_status = 128 + SIGINT; |
9240 | if (i == EXSIG) |
9241 | exit_status = 128 + pending_sig; |
9242 | exitstatus = exit_status; |
9243 | if (i == EXINT || spclbltin > 0) { |
9244 | raise: |
9245 | longjmp(exception_handler->loc, 1); |
9246 | } |
9247 | FORCE_INT_ON; |
9248 | } |
9249 | break; |
9250 | |
9251 | case CMDFUNCTION: |
9252 | listsetvar(varlist.list, 0); |
9253 | /* See above for the rationale */ |
9254 | dowait(DOWAIT_NONBLOCK, NULL); |
9255 | if (evalfun(cmdentry.u.func, argc, argv, flags)) |
9256 | goto raise; |
9257 | break; |
9258 | |
9259 | } /* switch */ |
9260 | |
9261 | out: |
9262 | popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec); |
9263 | if (lastarg) { |
9264 | /* dsl: I think this is intended to be used to support |
9265 | * '_' in 'vi' command mode during line editing... |
9266 | * However I implemented that within libedit itself. |
9267 | */ |
9268 | setvar("_", lastarg, 0); |
9269 | } |
9270 | popstackmark(&smark); |
9271 | } |
9272 | |
9273 | static int |
9274 | evalbltin(const struct builtincmd *cmd, int argc, char **argv) |
9275 | { |
9276 | char *volatile savecmdname; |
9277 | struct jmploc *volatile savehandler; |
9278 | struct jmploc jmploc; |
9279 | int i; |
9280 | |
9281 | savecmdname = commandname; |
9282 | i = setjmp(jmploc.loc); |
9283 | if (i) |
9284 | goto cmddone; |
9285 | savehandler = exception_handler; |
9286 | exception_handler = &jmploc; |
9287 | commandname = argv[0]; |
9288 | argptr = argv + 1; |
9289 | optptr = NULL; /* initialize nextopt */ |
9290 | exitstatus = (*cmd->builtin)(argc, argv); |
9291 | flush_stdout_stderr(); |
9292 | cmddone: |
9293 | exitstatus |= ferror(stdout); |
9294 | clearerr(stdout); |
9295 | commandname = savecmdname; |
9296 | exception_handler = savehandler; |
9297 | |
9298 | return i; |
9299 | } |
9300 | |
9301 | static int |
9302 | goodname(const char *p) |
9303 | { |
9304 | return !*endofname(p); |
9305 | } |
9306 | |
9307 | |
9308 | /* |
9309 | * Search for a command. This is called before we fork so that the |
9310 | * location of the command will be available in the parent as well as |
9311 | * the child. The check for "goodname" is an overly conservative |
9312 | * check that the name will not be subject to expansion. |
9313 | */ |
9314 | static void |
9315 | prehash(union node *n) |
9316 | { |
9317 | struct cmdentry entry; |
9318 | |
9319 | if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text)) |
9320 | find_command(n->ncmd.args->narg.text, &entry, 0, pathval()); |
9321 | } |
9322 | |
9323 | |
9324 | /* ============ Builtin commands |
9325 | * |
9326 | * Builtin commands whose functions are closely tied to evaluation |
9327 | * are implemented here. |
9328 | */ |
9329 | |
9330 | /* |
9331 | * Handle break and continue commands. Break, continue, and return are |
9332 | * all handled by setting the evalskip flag. The evaluation routines |
9333 | * above all check this flag, and if it is set they start skipping |
9334 | * commands rather than executing them. The variable skipcount is |
9335 | * the number of loops to break/continue, or the number of function |
9336 | * levels to return. (The latter is always 1.) It should probably |
9337 | * be an error to break out of more loops than exist, but it isn't |
9338 | * in the standard shell so we don't make it one here. |
9339 | */ |
9340 | static int FAST_FUNC |
9341 | breakcmd(int argc UNUSED_PARAM, char **argv) |
9342 | { |
9343 | int n = argv[1] ? number(argv[1]) : 1; |
9344 | |
9345 | if (n <= 0) |
9346 | ash_msg_and_raise_error(msg_illnum, argv[1]); |
9347 | if (n > loopnest) |
9348 | n = loopnest; |
9349 | if (n > 0) { |
9350 | evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK; |
9351 | skipcount = n; |
9352 | } |
9353 | return 0; |
9354 | } |
9355 | |
9356 | |
9357 | /* ============ input.c |
9358 | * |
9359 | * This implements the input routines used by the parser. |
9360 | */ |
9361 | |
9362 | enum { |
9363 | INPUT_PUSH_FILE = 1, |
9364 | INPUT_NOFILE_OK = 2, |
9365 | }; |
9366 | |
9367 | static smallint checkkwd; |
9368 | /* values of checkkwd variable */ |
9369 | #define CHKALIAS 0x1 |
9370 | #define CHKKWD 0x2 |
9371 | #define CHKNL 0x4 |
9372 | |
9373 | /* |
9374 | * Push a string back onto the input at this current parsefile level. |
9375 | * We handle aliases this way. |
9376 | */ |
9377 | #if !ENABLE_ASH_ALIAS |
9378 | #define pushstring(s, ap) pushstring(s) |
9379 | #endif |
9380 | static void |
9381 | pushstring(char *s, struct alias *ap) |
9382 | { |
9383 | struct strpush *sp; |
9384 | int len; |
9385 | |
9386 | len = strlen(s); |
9387 | INT_OFF; |
9388 | if (g_parsefile->strpush) { |
9389 | sp = ckzalloc(sizeof(*sp)); |
9390 | sp->prev = g_parsefile->strpush; |
9391 | } else { |
9392 | sp = &(g_parsefile->basestrpush); |
9393 | } |
9394 | g_parsefile->strpush = sp; |
9395 | sp->prev_string = g_parsefile->next_to_pgetc; |
9396 | sp->prev_left_in_line = g_parsefile->left_in_line; |
9397 | #if ENABLE_ASH_ALIAS |
9398 | sp->ap = ap; |
9399 | if (ap) { |
9400 | ap->flag |= ALIASINUSE; |
9401 | sp->string = s; |
9402 | } |
9403 | #endif |
9404 | g_parsefile->next_to_pgetc = s; |
9405 | g_parsefile->left_in_line = len; |
9406 | INT_ON; |
9407 | } |
9408 | |
9409 | static void |
9410 | popstring(void) |
9411 | { |
9412 | struct strpush *sp = g_parsefile->strpush; |
9413 | |
9414 | INT_OFF; |
9415 | #if ENABLE_ASH_ALIAS |
9416 | if (sp->ap) { |
9417 | if (g_parsefile->next_to_pgetc[-1] == ' ' |
9418 | || g_parsefile->next_to_pgetc[-1] == '\t' |
9419 | ) { |
9420 | checkkwd |= CHKALIAS; |
9421 | } |
9422 | if (sp->string != sp->ap->val) { |
9423 | free(sp->string); |
9424 | } |
9425 | sp->ap->flag &= ~ALIASINUSE; |
9426 | if (sp->ap->flag & ALIASDEAD) { |
9427 | unalias(sp->ap->name); |
9428 | } |
9429 | } |
9430 | #endif |
9431 | g_parsefile->next_to_pgetc = sp->prev_string; |
9432 | g_parsefile->left_in_line = sp->prev_left_in_line; |
9433 | g_parsefile->strpush = sp->prev; |
9434 | if (sp != &(g_parsefile->basestrpush)) |
9435 | free(sp); |
9436 | INT_ON; |
9437 | } |
9438 | |
9439 | //FIXME: BASH_COMPAT with "...&" does TWO pungetc(): |
9440 | //it peeks whether it is &>, and then pushes back both chars. |
9441 | //This function needs to save last *next_to_pgetc to buf[0] |
9442 | //to make two pungetc() reliable. Currently, |
9443 | // pgetc (out of buf: does preadfd), pgetc, pungetc, pungetc won't work... |
9444 | static int |
9445 | preadfd(void) |
9446 | { |
9447 | int nr; |
9448 | char *buf = g_parsefile->buf; |
9449 | |
9450 | g_parsefile->next_to_pgetc = buf; |
9451 | #if ENABLE_FEATURE_EDITING |
9452 | retry: |
9453 | if (!iflag || g_parsefile->pf_fd != STDIN_FILENO) |
9454 | nr = nonblock_safe_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1); |
9455 | else { |
9456 | #if ENABLE_FEATURE_TAB_COMPLETION |
9457 | line_input_state->path_lookup = pathval(); |
9458 | #endif |
9459 | nr = read_line_input(cmdedit_prompt, buf, IBUFSIZ, line_input_state); |
9460 | if (nr == 0) { |
9461 | /* Ctrl+C pressed */ |
9462 | if (trap[SIGINT]) { |
9463 | buf[0] = '\n'; |
9464 | buf[1] = '\0'; |
9465 | raise(SIGINT); |
9466 | return 1; |
9467 | } |
9468 | goto retry; |
9469 | } |
9470 | if (nr < 0 && errno == 0) { |
9471 | /* Ctrl+D pressed */ |
9472 | nr = 0; |
9473 | } |
9474 | } |
9475 | #else |
9476 | nr = nonblock_safe_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1); |
9477 | #endif |
9478 | |
9479 | #if 0 |
9480 | /* nonblock_safe_read() handles this problem */ |
9481 | if (nr < 0) { |
9482 | if (parsefile->fd == 0 && errno == EWOULDBLOCK) { |
9483 | int flags = fcntl(0, F_GETFL); |
9484 | if (flags >= 0 && (flags & O_NONBLOCK)) { |
9485 | flags &= ~O_NONBLOCK; |
9486 | if (fcntl(0, F_SETFL, flags) >= 0) { |
9487 | out2str("sh: turning off NDELAY mode\n"); |
9488 | goto retry; |
9489 | } |
9490 | } |
9491 | } |
9492 | } |
9493 | #endif |
9494 | return nr; |
9495 | } |
9496 | |
9497 | /* |
9498 | * Refill the input buffer and return the next input character: |
9499 | * |
9500 | * 1) If a string was pushed back on the input, pop it; |
9501 | * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM) |
9502 | * or we are reading from a string so we can't refill the buffer, |
9503 | * return EOF. |
9504 | * 3) If there is more stuff in this buffer, use it else call read to fill it. |
9505 | * 4) Process input up to the next newline, deleting nul characters. |
9506 | */ |
9507 | //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__) |
9508 | #define pgetc_debug(...) ((void)0) |
9509 | static int |
9510 | preadbuffer(void) |
9511 | { |
9512 | char *q; |
9513 | int more; |
9514 | |
9515 | while (g_parsefile->strpush) { |
9516 | #if ENABLE_ASH_ALIAS |
9517 | if (g_parsefile->left_in_line == -1 |
9518 | && g_parsefile->strpush->ap |
9519 | && g_parsefile->next_to_pgetc[-1] != ' ' |
9520 | && g_parsefile->next_to_pgetc[-1] != '\t' |
9521 | ) { |
9522 | pgetc_debug("preadbuffer PEOA"); |
9523 | return PEOA; |
9524 | } |
9525 | #endif |
9526 | popstring(); |
9527 | /* try "pgetc" now: */ |
9528 | pgetc_debug("preadbuffer internal pgetc at %d:%p'%s'", |
9529 | g_parsefile->left_in_line, |
9530 | g_parsefile->next_to_pgetc, |
9531 | g_parsefile->next_to_pgetc); |
9532 | if (--g_parsefile->left_in_line >= 0) |
9533 | return (unsigned char)(*g_parsefile->next_to_pgetc++); |
9534 | } |
9535 | /* on both branches above g_parsefile->left_in_line < 0. |
9536 | * "pgetc" needs refilling. |
9537 | */ |
9538 | |
9539 | /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read", |
9540 | * pungetc() may increment it a few times. |
9541 | * Assuming it won't increment it to less than -90. |
9542 | */ |
9543 | if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) { |
9544 | pgetc_debug("preadbuffer PEOF1"); |
9545 | /* even in failure keep left_in_line and next_to_pgetc |
9546 | * in lock step, for correct multi-layer pungetc. |
9547 | * left_in_line was decremented before preadbuffer(), |
9548 | * must inc next_to_pgetc: */ |
9549 | g_parsefile->next_to_pgetc++; |
9550 | return PEOF; |
9551 | } |
9552 | |
9553 | more = g_parsefile->left_in_buffer; |
9554 | if (more <= 0) { |
9555 | flush_stdout_stderr(); |
9556 | again: |
9557 | more = preadfd(); |
9558 | if (more <= 0) { |
9559 | /* don't try reading again */ |
9560 | g_parsefile->left_in_line = -99; |
9561 | pgetc_debug("preadbuffer PEOF2"); |
9562 | g_parsefile->next_to_pgetc++; |
9563 | return PEOF; |
9564 | } |
9565 | } |
9566 | |
9567 | /* Find out where's the end of line. |
9568 | * Set g_parsefile->left_in_line |
9569 | * and g_parsefile->left_in_buffer acordingly. |
9570 | * NUL chars are deleted. |
9571 | */ |
9572 | q = g_parsefile->next_to_pgetc; |
9573 | for (;;) { |
9574 | char c; |
9575 | |
9576 | more--; |
9577 | |
9578 | c = *q; |
9579 | if (c == '\0') { |
9580 | memmove(q, q + 1, more); |
9581 | } else { |
9582 | q++; |
9583 | if (c == '\n') { |
9584 | g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1; |
9585 | break; |
9586 | } |
9587 | } |
9588 | |
9589 | if (more <= 0) { |
9590 | g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1; |
9591 | if (g_parsefile->left_in_line < 0) |
9592 | goto again; |
9593 | break; |
9594 | } |
9595 | } |
9596 | g_parsefile->left_in_buffer = more; |
9597 | |
9598 | if (vflag) { |
9599 | char save = *q; |
9600 | *q = '\0'; |
9601 | out2str(g_parsefile->next_to_pgetc); |
9602 | *q = save; |
9603 | } |
9604 | |
9605 | pgetc_debug("preadbuffer at %d:%p'%s'", |
9606 | g_parsefile->left_in_line, |
9607 | g_parsefile->next_to_pgetc, |
9608 | g_parsefile->next_to_pgetc); |
9609 | return (unsigned char)*g_parsefile->next_to_pgetc++; |
9610 | } |
9611 | |
9612 | #define pgetc_as_macro() \ |
9613 | (--g_parsefile->left_in_line >= 0 \ |
9614 | ? (unsigned char)*g_parsefile->next_to_pgetc++ \ |
9615 | : preadbuffer() \ |
9616 | ) |
9617 | |
9618 | static int |
9619 | pgetc(void) |
9620 | { |
9621 | pgetc_debug("pgetc_fast at %d:%p'%s'", |
9622 | g_parsefile->left_in_line, |
9623 | g_parsefile->next_to_pgetc, |
9624 | g_parsefile->next_to_pgetc); |
9625 | return pgetc_as_macro(); |
9626 | } |
9627 | |
9628 | #if ENABLE_ASH_OPTIMIZE_FOR_SIZE |
9629 | # define pgetc_fast() pgetc() |
9630 | #else |
9631 | # define pgetc_fast() pgetc_as_macro() |
9632 | #endif |
9633 | |
9634 | #if ENABLE_ASH_ALIAS |
9635 | static int |
9636 | pgetc_without_PEOA(void) |
9637 | { |
9638 | int c; |
9639 | do { |
9640 | pgetc_debug("pgetc_fast at %d:%p'%s'", |
9641 | g_parsefile->left_in_line, |
9642 | g_parsefile->next_to_pgetc, |
9643 | g_parsefile->next_to_pgetc); |
9644 | c = pgetc_fast(); |
9645 | } while (c == PEOA); |
9646 | return c; |
9647 | } |
9648 | #else |
9649 | # define pgetc_without_PEOA() pgetc() |
9650 | #endif |
9651 | |
9652 | /* |
9653 | * Read a line from the script. |
9654 | */ |
9655 | static char * |
9656 | pfgets(char *line, int len) |
9657 | { |
9658 | char *p = line; |
9659 | int nleft = len; |
9660 | int c; |
9661 | |
9662 | while (--nleft > 0) { |
9663 | c = pgetc_without_PEOA(); |
9664 | if (c == PEOF) { |
9665 | if (p == line) |
9666 | return NULL; |
9667 | break; |
9668 | } |
9669 | *p++ = c; |
9670 | if (c == '\n') |
9671 | break; |
9672 | } |
9673 | *p = '\0'; |
9674 | return line; |
9675 | } |
9676 | |
9677 | /* |
9678 | * Undo the last call to pgetc. Only one character may be pushed back. |
9679 | * PEOF may be pushed back. |
9680 | */ |
9681 | static void |
9682 | pungetc(void) |
9683 | { |
9684 | g_parsefile->left_in_line++; |
9685 | g_parsefile->next_to_pgetc--; |
9686 | pgetc_debug("pushed back to %d:%p'%s'", |
9687 | g_parsefile->left_in_line, |
9688 | g_parsefile->next_to_pgetc, |
9689 | g_parsefile->next_to_pgetc); |
9690 | } |
9691 | |
9692 | /* |
9693 | * To handle the "." command, a stack of input files is used. Pushfile |
9694 | * adds a new entry to the stack and popfile restores the previous level. |
9695 | */ |
9696 | static void |
9697 | pushfile(void) |
9698 | { |
9699 | struct parsefile *pf; |
9700 | |
9701 | pf = ckzalloc(sizeof(*pf)); |
9702 | pf->prev = g_parsefile; |
9703 | pf->pf_fd = -1; |
9704 | /*pf->strpush = NULL; - ckzalloc did it */ |
9705 | /*pf->basestrpush.prev = NULL;*/ |
9706 | g_parsefile = pf; |
9707 | } |
9708 | |
9709 | static void |
9710 | popfile(void) |
9711 | { |
9712 | struct parsefile *pf = g_parsefile; |
9713 | |
9714 | INT_OFF; |
9715 | if (pf->pf_fd >= 0) |
9716 | close(pf->pf_fd); |
9717 | free(pf->buf); |
9718 | while (pf->strpush) |
9719 | popstring(); |
9720 | g_parsefile = pf->prev; |
9721 | free(pf); |
9722 | INT_ON; |
9723 | } |
9724 | |
9725 | /* |
9726 | * Return to top level. |
9727 | */ |
9728 | static void |
9729 | popallfiles(void) |
9730 | { |
9731 | while (g_parsefile != &basepf) |
9732 | popfile(); |
9733 | } |
9734 | |
9735 | /* |
9736 | * Close the file(s) that the shell is reading commands from. Called |
9737 | * after a fork is done. |
9738 | */ |
9739 | static void |
9740 | closescript(void) |
9741 | { |
9742 | popallfiles(); |
9743 | if (g_parsefile->pf_fd > 0) { |
9744 | close(g_parsefile->pf_fd); |
9745 | g_parsefile->pf_fd = 0; |
9746 | } |
9747 | } |
9748 | |
9749 | /* |
9750 | * Like setinputfile, but takes an open file descriptor. Call this with |
9751 | * interrupts off. |
9752 | */ |
9753 | static void |
9754 | setinputfd(int fd, int push) |
9755 | { |
9756 | close_on_exec_on(fd); |
9757 | if (push) { |
9758 | pushfile(); |
9759 | g_parsefile->buf = NULL; |
9760 | } |
9761 | g_parsefile->pf_fd = fd; |
9762 | if (g_parsefile->buf == NULL) |
9763 | g_parsefile->buf = ckmalloc(IBUFSIZ); |
9764 | g_parsefile->left_in_buffer = 0; |
9765 | g_parsefile->left_in_line = 0; |
9766 | g_parsefile->linno = 1; |
9767 | } |
9768 | |
9769 | /* |
9770 | * Set the input to take input from a file. If push is set, push the |
9771 | * old input onto the stack first. |
9772 | */ |
9773 | static int |
9774 | setinputfile(const char *fname, int flags) |
9775 | { |
9776 | int fd; |
9777 | int fd2; |
9778 | |
9779 | INT_OFF; |
9780 | fd = open(fname, O_RDONLY); |
9781 | if (fd < 0) { |
9782 | if (flags & INPUT_NOFILE_OK) |
9783 | goto out; |
9784 | ash_msg_and_raise_error("can't open '%s'", fname); |
9785 | } |
9786 | if (fd < 10) { |
9787 | fd2 = copyfd(fd, 10); |
9788 | close(fd); |
9789 | if (fd2 < 0) |
9790 | ash_msg_and_raise_error("out of file descriptors"); |
9791 | fd = fd2; |
9792 | } |
9793 | setinputfd(fd, flags & INPUT_PUSH_FILE); |
9794 | out: |
9795 | INT_ON; |
9796 | return fd; |
9797 | } |
9798 | |
9799 | /* |
9800 | * Like setinputfile, but takes input from a string. |
9801 | */ |
9802 | static void |
9803 | setinputstring(char *string) |
9804 | { |
9805 | INT_OFF; |
9806 | pushfile(); |
9807 | g_parsefile->next_to_pgetc = string; |
9808 | g_parsefile->left_in_line = strlen(string); |
9809 | g_parsefile->buf = NULL; |
9810 | g_parsefile->linno = 1; |
9811 | INT_ON; |
9812 | } |
9813 | |
9814 | |
9815 | /* ============ mail.c |
9816 | * |
9817 | * Routines to check for mail. |
9818 | */ |
9819 | |
9820 | #if ENABLE_ASH_MAIL |
9821 | |
9822 | #define MAXMBOXES 10 |
9823 | |
9824 | /* times of mailboxes */ |
9825 | static time_t mailtime[MAXMBOXES]; |
9826 | /* Set if MAIL or MAILPATH is changed. */ |
9827 | static smallint mail_var_path_changed; |
9828 | |
9829 | /* |
9830 | * Print appropriate message(s) if mail has arrived. |
9831 | * If mail_var_path_changed is set, |
9832 | * then the value of MAIL has mail_var_path_changed, |
9833 | * so we just update the values. |
9834 | */ |
9835 | static void |
9836 | chkmail(void) |
9837 | { |
9838 | const char *mpath; |
9839 | char *p; |
9840 | char *q; |
9841 | time_t *mtp; |
9842 | struct stackmark smark; |
9843 | struct stat statb; |
9844 | |
9845 | setstackmark(&smark); |
9846 | mpath = mpathset() ? mpathval() : mailval(); |
9847 | for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) { |
9848 | p = path_advance(&mpath, nullstr); |
9849 | if (p == NULL) |
9850 | break; |
9851 | if (*p == '\0') |
9852 | continue; |
9853 | for (q = p; *q; q++) |
9854 | continue; |
9855 | #if DEBUG |
9856 | if (q[-1] != '/') |
9857 | abort(); |
9858 | #endif |
9859 | q[-1] = '\0'; /* delete trailing '/' */ |
9860 | if (stat(p, &statb) < 0) { |
9861 | *mtp = 0; |
9862 | continue; |
9863 | } |
9864 | if (!mail_var_path_changed && statb.st_mtime != *mtp) { |
9865 | fprintf( |
9866 | stderr, "%s\n", |
9867 | pathopt ? pathopt : "you have mail" |
9868 | ); |
9869 | } |
9870 | *mtp = statb.st_mtime; |
9871 | } |
9872 | mail_var_path_changed = 0; |
9873 | popstackmark(&smark); |
9874 | } |
9875 | |
9876 | static void FAST_FUNC |
9877 | changemail(const char *val UNUSED_PARAM) |
9878 | { |
9879 | mail_var_path_changed = 1; |
9880 | } |
9881 | |
9882 | #endif /* ASH_MAIL */ |
9883 | |
9884 | |
9885 | /* ============ ??? */ |
9886 | |
9887 | /* |
9888 | * Set the shell parameters. |
9889 | */ |
9890 | static void |
9891 | setparam(char **argv) |
9892 | { |
9893 | char **newparam; |
9894 | char **ap; |
9895 | int nparam; |
9896 | |
9897 | for (nparam = 0; argv[nparam]; nparam++) |
9898 | continue; |
9899 | ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap)); |
9900 | while (*argv) { |
9901 | *ap++ = ckstrdup(*argv++); |
9902 | } |
9903 | *ap = NULL; |
9904 | freeparam(&shellparam); |
9905 | shellparam.malloced = 1; |
9906 | shellparam.nparam = nparam; |
9907 | shellparam.p = newparam; |
9908 | #if ENABLE_ASH_GETOPTS |
9909 | shellparam.optind = 1; |
9910 | shellparam.optoff = -1; |
9911 | #endif |
9912 | } |
9913 | |
9914 | /* |
9915 | * Process shell options. The global variable argptr contains a pointer |
9916 | * to the argument list; we advance it past the options. |
9917 | * |
9918 | * SUSv3 section 2.8.1 "Consequences of Shell Errors" says: |
9919 | * For a non-interactive shell, an error condition encountered |
9920 | * by a special built-in ... shall cause the shell to write a diagnostic message |
9921 | * to standard error and exit as shown in the following table: |
9922 | * Error Special Built-In |
9923 | * ... |
9924 | * Utility syntax error (option or operand error) Shall exit |
9925 | * ... |
9926 | * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142) |
9927 | * we see that bash does not do that (set "finishes" with error code 1 instead, |
9928 | * and shell continues), and people rely on this behavior! |
9929 | * Testcase: |
9930 | * set -o barfoo 2>/dev/null |
9931 | * echo $? |
9932 | * |
9933 | * Oh well. Let's mimic that. |
9934 | */ |
9935 | static int |
9936 | plus_minus_o(char *name, int val) |
9937 | { |
9938 | int i; |
9939 | |
9940 | if (name) { |
9941 | for (i = 0; i < NOPTS; i++) { |
9942 | if (strcmp(name, optnames(i)) == 0) { |
9943 | optlist[i] = val; |
9944 | return 0; |
9945 | } |
9946 | } |
9947 | ash_msg("illegal option %co %s", val ? '-' : '+', name); |
9948 | return 1; |
9949 | } |
9950 | for (i = 0; i < NOPTS; i++) { |
9951 | if (val) { |
9952 | out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off"); |
9953 | } else { |
9954 | out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i)); |
9955 | } |
9956 | } |
9957 | return 0; |
9958 | } |
9959 | static void |
9960 | setoption(int flag, int val) |
9961 | { |
9962 | int i; |
9963 | |
9964 | for (i = 0; i < NOPTS; i++) { |
9965 | if (optletters(i) == flag) { |
9966 | optlist[i] = val; |
9967 | return; |
9968 | } |
9969 | } |
9970 | ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag); |
9971 | /* NOTREACHED */ |
9972 | } |
9973 | static int |
9974 | options(int cmdline) |
9975 | { |
9976 | char *p; |
9977 | int val; |
9978 | int c; |
9979 | |
9980 | if (cmdline) |
9981 | minusc = NULL; |
9982 | while ((p = *argptr) != NULL) { |
9983 | c = *p++; |
9984 | if (c != '-' && c != '+') |
9985 | break; |
9986 | argptr++; |
9987 | val = 0; /* val = 0 if c == '+' */ |
9988 | if (c == '-') { |
9989 | val = 1; |
9990 | if (p[0] == '\0' || LONE_DASH(p)) { |
9991 | if (!cmdline) { |
9992 | /* "-" means turn off -x and -v */ |
9993 | if (p[0] == '\0') |
9994 | xflag = vflag = 0; |
9995 | /* "--" means reset params */ |
9996 | else if (*argptr == NULL) |
9997 | setparam(argptr); |
9998 | } |
9999 | break; /* "-" or "--" terminates options */ |
10000 | } |
10001 | } |
10002 | /* first char was + or - */ |
10003 | while ((c = *p++) != '\0') { |
10004 | /* bash 3.2 indeed handles -c CMD and +c CMD the same */ |
10005 | if (c == 'c' && cmdline) { |
10006 | minusc = p; /* command is after shell args */ |
10007 | } else if (c == 'o') { |
10008 | if (plus_minus_o(*argptr, val)) { |
10009 | /* it already printed err message */ |
10010 | return 1; /* error */ |
10011 | } |
10012 | if (*argptr) |
10013 | argptr++; |
10014 | } else if (cmdline && (c == 'l')) { /* -l or +l == --login */ |
10015 | isloginsh = 1; |
10016 | /* bash does not accept +-login, we also won't */ |
10017 | } else if (cmdline && val && (c == '-')) { /* long options */ |
10018 | if (strcmp(p, "login") == 0) |
10019 | isloginsh = 1; |
10020 | break; |
10021 | } else { |
10022 | setoption(c, val); |
10023 | } |
10024 | } |
10025 | } |
10026 | return 0; |
10027 | } |
10028 | |
10029 | /* |
10030 | * The shift builtin command. |
10031 | */ |
10032 | static int FAST_FUNC |
10033 | shiftcmd(int argc UNUSED_PARAM, char **argv) |
10034 | { |
10035 | int n; |
10036 | char **ap1, **ap2; |
10037 | |
10038 | n = 1; |
10039 | if (argv[1]) |
10040 | n = number(argv[1]); |
10041 | if (n > shellparam.nparam) |
10042 | n = 0; /* bash compat, was = shellparam.nparam; */ |
10043 | INT_OFF; |
10044 | shellparam.nparam -= n; |
10045 | for (ap1 = shellparam.p; --n >= 0; ap1++) { |
10046 | if (shellparam.malloced) |
10047 | free(*ap1); |
10048 | } |
10049 | ap2 = shellparam.p; |
10050 | while ((*ap2++ = *ap1++) != NULL) |
10051 | continue; |
10052 | #if ENABLE_ASH_GETOPTS |
10053 | shellparam.optind = 1; |
10054 | shellparam.optoff = -1; |
10055 | #endif |
10056 | INT_ON; |
10057 | return 0; |
10058 | } |
10059 | |
10060 | /* |
10061 | * POSIX requires that 'set' (but not export or readonly) output the |
10062 | * variables in lexicographic order - by the locale's collating order (sigh). |
10063 | * Maybe we could keep them in an ordered balanced binary tree |
10064 | * instead of hashed lists. |
10065 | * For now just roll 'em through qsort for printing... |
10066 | */ |
10067 | static int |
10068 | showvars(const char *sep_prefix, int on, int off) |
10069 | { |
10070 | const char *sep; |
10071 | char **ep, **epend; |
10072 | |
10073 | ep = listvars(on, off, &epend); |
10074 | qsort(ep, epend - ep, sizeof(char *), vpcmp); |
10075 | |
10076 | sep = *sep_prefix ? " " : sep_prefix; |
10077 | |
10078 | for (; ep < epend; ep++) { |
10079 | const char *p; |
10080 | const char *q; |
10081 | |
10082 | p = strchrnul(*ep, '='); |
10083 | q = nullstr; |
10084 | if (*p) |
10085 | q = single_quote(++p); |
10086 | out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q); |
10087 | } |
10088 | return 0; |
10089 | } |
10090 | |
10091 | /* |
10092 | * The set command builtin. |
10093 | */ |
10094 | static int FAST_FUNC |
10095 | setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
10096 | { |
10097 | int retval; |
10098 | |
10099 | if (!argv[1]) |
10100 | return showvars(nullstr, 0, VUNSET); |
10101 | INT_OFF; |
10102 | retval = 1; |
10103 | if (!options(0)) { /* if no parse error... */ |
10104 | retval = 0; |
10105 | optschanged(); |
10106 | if (*argptr != NULL) { |
10107 | setparam(argptr); |
10108 | } |
10109 | } |
10110 | INT_ON; |
10111 | return retval; |
10112 | } |
10113 | |
10114 | #if ENABLE_ASH_RANDOM_SUPPORT |
10115 | static void FAST_FUNC |
10116 | change_random(const char *value) |
10117 | { |
10118 | uint32_t t; |
10119 | |
10120 | if (value == NULL) { |
10121 | /* "get", generate */ |
10122 | t = next_random(&random_gen); |
10123 | /* set without recursion */ |
10124 | setvar(vrandom.var_text, utoa(t), VNOFUNC); |
10125 | vrandom.flags &= ~VNOFUNC; |
10126 | } else { |
10127 | /* set/reset */ |
10128 | t = strtoul(value, NULL, 10); |
10129 | INIT_RANDOM_T(&random_gen, (t ? t : 1), t); |
10130 | } |
10131 | } |
10132 | #endif |
10133 | |
10134 | #if ENABLE_ASH_GETOPTS |
10135 | static int |
10136 | getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff) |
10137 | { |
10138 | char *p, *q; |
10139 | char c = '?'; |
10140 | int done = 0; |
10141 | int err = 0; |
10142 | char s[12]; |
10143 | char **optnext; |
10144 | |
10145 | if (*param_optind < 1) |
10146 | return 1; |
10147 | optnext = optfirst + *param_optind - 1; |
10148 | |
10149 | if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff) |
10150 | p = NULL; |
10151 | else |
10152 | p = optnext[-1] + *optoff; |
10153 | if (p == NULL || *p == '\0') { |
10154 | /* Current word is done, advance */ |
10155 | p = *optnext; |
10156 | if (p == NULL || *p != '-' || *++p == '\0') { |
10157 | atend: |
10158 | p = NULL; |
10159 | done = 1; |
10160 | goto out; |
10161 | } |
10162 | optnext++; |
10163 | if (LONE_DASH(p)) /* check for "--" */ |
10164 | goto atend; |
10165 | } |
10166 | |
10167 | c = *p++; |
10168 | for (q = optstr; *q != c;) { |
10169 | if (*q == '\0') { |
10170 | if (optstr[0] == ':') { |
10171 | s[0] = c; |
10172 | s[1] = '\0'; |
10173 | err |= setvarsafe("OPTARG", s, 0); |
10174 | } else { |
10175 | fprintf(stderr, "Illegal option -%c\n", c); |
10176 | unsetvar("OPTARG"); |
10177 | } |
10178 | c = '?'; |
10179 | goto out; |
10180 | } |
10181 | if (*++q == ':') |
10182 | q++; |
10183 | } |
10184 | |
10185 | if (*++q == ':') { |
10186 | if (*p == '\0' && (p = *optnext) == NULL) { |
10187 | if (optstr[0] == ':') { |
10188 | s[0] = c; |
10189 | s[1] = '\0'; |
10190 | err |= setvarsafe("OPTARG", s, 0); |
10191 | c = ':'; |
10192 | } else { |
10193 | fprintf(stderr, "No arg for -%c option\n", c); |
10194 | unsetvar("OPTARG"); |
10195 | c = '?'; |
10196 | } |
10197 | goto out; |
10198 | } |
10199 | |
10200 | if (p == *optnext) |
10201 | optnext++; |
10202 | err |= setvarsafe("OPTARG", p, 0); |
10203 | p = NULL; |
10204 | } else |
10205 | err |= setvarsafe("OPTARG", nullstr, 0); |
10206 | out: |
10207 | *optoff = p ? p - *(optnext - 1) : -1; |
10208 | *param_optind = optnext - optfirst + 1; |
10209 | fmtstr(s, sizeof(s), "%d", *param_optind); |
10210 | err |= setvarsafe("OPTIND", s, VNOFUNC); |
10211 | s[0] = c; |
10212 | s[1] = '\0'; |
10213 | err |= setvarsafe(optvar, s, 0); |
10214 | if (err) { |
10215 | *param_optind = 1; |
10216 | *optoff = -1; |
10217 | flush_stdout_stderr(); |
10218 | raise_exception(EXERROR); |
10219 | } |
10220 | return done; |
10221 | } |
10222 | |
10223 | /* |
10224 | * The getopts builtin. Shellparam.optnext points to the next argument |
10225 | * to be processed. Shellparam.optptr points to the next character to |
10226 | * be processed in the current argument. If shellparam.optnext is NULL, |
10227 | * then it's the first time getopts has been called. |
10228 | */ |
10229 | static int FAST_FUNC |
10230 | getoptscmd(int argc, char **argv) |
10231 | { |
10232 | char **optbase; |
10233 | |
10234 | if (argc < 3) |
10235 | ash_msg_and_raise_error("usage: getopts optstring var [arg]"); |
10236 | if (argc == 3) { |
10237 | optbase = shellparam.p; |
10238 | if (shellparam.optind > shellparam.nparam + 1) { |
10239 | shellparam.optind = 1; |
10240 | shellparam.optoff = -1; |
10241 | } |
10242 | } else { |
10243 | optbase = &argv[3]; |
10244 | if (shellparam.optind > argc - 2) { |
10245 | shellparam.optind = 1; |
10246 | shellparam.optoff = -1; |
10247 | } |
10248 | } |
10249 | |
10250 | return getopts(argv[1], argv[2], optbase, &shellparam.optind, |
10251 | &shellparam.optoff); |
10252 | } |
10253 | #endif /* ASH_GETOPTS */ |
10254 | |
10255 | |
10256 | /* ============ Shell parser */ |
10257 | |
10258 | struct heredoc { |
10259 | struct heredoc *next; /* next here document in list */ |
10260 | union node *here; /* redirection node */ |
10261 | char *eofmark; /* string indicating end of input */ |
10262 | smallint striptabs; /* if set, strip leading tabs */ |
10263 | }; |
10264 | |
10265 | static smallint tokpushback; /* last token pushed back */ |
10266 | static smallint parsebackquote; /* nonzero if we are inside backquotes */ |
10267 | static smallint quoteflag; /* set if (part of) last token was quoted */ |
10268 | static token_id_t lasttoken; /* last token read (integer id Txxx) */ |
10269 | static struct heredoc *heredoclist; /* list of here documents to read */ |
10270 | static char *wordtext; /* text of last word returned by readtoken */ |
10271 | static struct nodelist *backquotelist; |
10272 | static union node *redirnode; |
10273 | static struct heredoc *heredoc; |
10274 | |
10275 | static const char * |
10276 | tokname(char *buf, int tok) |
10277 | { |
10278 | if (tok < TSEMI) |
10279 | return tokname_array[tok] + 1; |
10280 | sprintf(buf, "\"%s\"", tokname_array[tok] + 1); |
10281 | return buf; |
10282 | } |
10283 | |
10284 | /* raise_error_unexpected_syntax: |
10285 | * Called when an unexpected token is read during the parse. The argument |
10286 | * is the token that is expected, or -1 if more than one type of token can |
10287 | * occur at this point. |
10288 | */ |
10289 | static void raise_error_unexpected_syntax(int) NORETURN; |
10290 | static void |
10291 | raise_error_unexpected_syntax(int token) |
10292 | { |
10293 | char msg[64]; |
10294 | char buf[16]; |
10295 | int l; |
10296 | |
10297 | l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken)); |
10298 | if (token >= 0) |
10299 | sprintf(msg + l, " (expecting %s)", tokname(buf, token)); |
10300 | raise_error_syntax(msg); |
10301 | /* NOTREACHED */ |
10302 | } |
10303 | |
10304 | #define EOFMARKLEN 79 |
10305 | |
10306 | /* parsing is heavily cross-recursive, need these forward decls */ |
10307 | static union node *andor(void); |
10308 | static union node *pipeline(void); |
10309 | static union node *parse_command(void); |
10310 | static void parseheredoc(void); |
10311 | static char peektoken(void); |
10312 | static int readtoken(void); |
10313 | |
10314 | static union node * |
10315 | list(int nlflag) |
10316 | { |
10317 | union node *n1, *n2, *n3; |
10318 | int tok; |
10319 | |
10320 | checkkwd = CHKNL | CHKKWD | CHKALIAS; |
10321 | if (nlflag == 2 && peektoken()) |
10322 | return NULL; |
10323 | n1 = NULL; |
10324 | for (;;) { |
10325 | n2 = andor(); |
10326 | tok = readtoken(); |
10327 | if (tok == TBACKGND) { |
10328 | if (n2->type == NPIPE) { |
10329 | n2->npipe.pipe_backgnd = 1; |
10330 | } else { |
10331 | if (n2->type != NREDIR) { |
10332 | n3 = stzalloc(sizeof(struct nredir)); |
10333 | n3->nredir.n = n2; |
10334 | /*n3->nredir.redirect = NULL; - stzalloc did it */ |
10335 | n2 = n3; |
10336 | } |
10337 | n2->type = NBACKGND; |
10338 | } |
10339 | } |
10340 | if (n1 == NULL) { |
10341 | n1 = n2; |
10342 | } else { |
10343 | n3 = stzalloc(sizeof(struct nbinary)); |
10344 | n3->type = NSEMI; |
10345 | n3->nbinary.ch1 = n1; |
10346 | n3->nbinary.ch2 = n2; |
10347 | n1 = n3; |
10348 | } |
10349 | switch (tok) { |
10350 | case TBACKGND: |
10351 | case TSEMI: |
10352 | tok = readtoken(); |
10353 | /* fall through */ |
10354 | case TNL: |
10355 | if (tok == TNL) { |
10356 | parseheredoc(); |
10357 | if (nlflag == 1) |
10358 | return n1; |
10359 | } else { |
10360 | tokpushback = 1; |
10361 | } |
10362 | checkkwd = CHKNL | CHKKWD | CHKALIAS; |
10363 | if (peektoken()) |
10364 | return n1; |
10365 | break; |
10366 | case TEOF: |
10367 | if (heredoclist) |
10368 | parseheredoc(); |
10369 | else |
10370 | pungetc(); /* push back EOF on input */ |
10371 | return n1; |
10372 | default: |
10373 | if (nlflag == 1) |
10374 | raise_error_unexpected_syntax(-1); |
10375 | tokpushback = 1; |
10376 | return n1; |
10377 | } |
10378 | } |
10379 | } |
10380 | |
10381 | static union node * |
10382 | andor(void) |
10383 | { |
10384 | union node *n1, *n2, *n3; |
10385 | int t; |
10386 | |
10387 | n1 = pipeline(); |
10388 | for (;;) { |
10389 | t = readtoken(); |
10390 | if (t == TAND) { |
10391 | t = NAND; |
10392 | } else if (t == TOR) { |
10393 | t = NOR; |
10394 | } else { |
10395 | tokpushback = 1; |
10396 | return n1; |
10397 | } |
10398 | checkkwd = CHKNL | CHKKWD | CHKALIAS; |
10399 | n2 = pipeline(); |
10400 | n3 = stzalloc(sizeof(struct nbinary)); |
10401 | n3->type = t; |
10402 | n3->nbinary.ch1 = n1; |
10403 | n3->nbinary.ch2 = n2; |
10404 | n1 = n3; |
10405 | } |
10406 | } |
10407 | |
10408 | static union node * |
10409 | pipeline(void) |
10410 | { |
10411 | union node *n1, *n2, *pipenode; |
10412 | struct nodelist *lp, *prev; |
10413 | int negate; |
10414 | |
10415 | negate = 0; |
10416 | TRACE(("pipeline: entered\n")); |
10417 | if (readtoken() == TNOT) { |
10418 | negate = !negate; |
10419 | checkkwd = CHKKWD | CHKALIAS; |
10420 | } else |
10421 | tokpushback = 1; |
10422 | n1 = parse_command(); |
10423 | if (readtoken() == TPIPE) { |
10424 | pipenode = stzalloc(sizeof(struct npipe)); |
10425 | pipenode->type = NPIPE; |
10426 | /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */ |
10427 | lp = stzalloc(sizeof(struct nodelist)); |
10428 | pipenode->npipe.cmdlist = lp; |
10429 | lp->n = n1; |
10430 | do { |
10431 | prev = lp; |
10432 | lp = stzalloc(sizeof(struct nodelist)); |
10433 | checkkwd = CHKNL | CHKKWD | CHKALIAS; |
10434 | lp->n = parse_command(); |
10435 | prev->next = lp; |
10436 | } while (readtoken() == TPIPE); |
10437 | lp->next = NULL; |
10438 | n1 = pipenode; |
10439 | } |
10440 | tokpushback = 1; |
10441 | if (negate) { |
10442 | n2 = stzalloc(sizeof(struct nnot)); |
10443 | n2->type = NNOT; |
10444 | n2->nnot.com = n1; |
10445 | return n2; |
10446 | } |
10447 | return n1; |
10448 | } |
10449 | |
10450 | static union node * |
10451 | makename(void) |
10452 | { |
10453 | union node *n; |
10454 | |
10455 | n = stzalloc(sizeof(struct narg)); |
10456 | n->type = NARG; |
10457 | /*n->narg.next = NULL; - stzalloc did it */ |
10458 | n->narg.text = wordtext; |
10459 | n->narg.backquote = backquotelist; |
10460 | return n; |
10461 | } |
10462 | |
10463 | static void |
10464 | fixredir(union node *n, const char *text, int err) |
10465 | { |
10466 | int fd; |
10467 | |
10468 | TRACE(("Fix redir %s %d\n", text, err)); |
10469 | if (!err) |
10470 | n->ndup.vname = NULL; |
10471 | |
10472 | fd = bb_strtou(text, NULL, 10); |
10473 | if (!errno && fd >= 0) |
10474 | n->ndup.dupfd = fd; |
10475 | else if (LONE_DASH(text)) |
10476 | n->ndup.dupfd = -1; |
10477 | else { |
10478 | if (err) |
10479 | raise_error_syntax("bad fd number"); |
10480 | n->ndup.vname = makename(); |
10481 | } |
10482 | } |
10483 | |
10484 | /* |
10485 | * Returns true if the text contains nothing to expand (no dollar signs |
10486 | * or backquotes). |
10487 | */ |
10488 | static int |
10489 | noexpand(const char *text) |
10490 | { |
10491 | unsigned char c; |
10492 | |
10493 | while ((c = *text++) != '\0') { |
10494 | if (c == CTLQUOTEMARK) |
10495 | continue; |
10496 | if (c == CTLESC) |
10497 | text++; |
10498 | else if (SIT(c, BASESYNTAX) == CCTL) |
10499 | return 0; |
10500 | } |
10501 | return 1; |
10502 | } |
10503 | |
10504 | static void |
10505 | parsefname(void) |
10506 | { |
10507 | union node *n = redirnode; |
10508 | |
10509 | if (readtoken() != TWORD) |
10510 | raise_error_unexpected_syntax(-1); |
10511 | if (n->type == NHERE) { |
10512 | struct heredoc *here = heredoc; |
10513 | struct heredoc *p; |
10514 | int i; |
10515 | |
10516 | if (quoteflag == 0) |
10517 | n->type = NXHERE; |
10518 | TRACE(("Here document %d\n", n->type)); |
10519 | if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) |
10520 | raise_error_syntax("illegal eof marker for << redirection"); |
10521 | rmescapes(wordtext, 0); |
10522 | here->eofmark = wordtext; |
10523 | here->next = NULL; |
10524 | if (heredoclist == NULL) |
10525 | heredoclist = here; |
10526 | else { |
10527 | for (p = heredoclist; p->next; p = p->next) |
10528 | continue; |
10529 | p->next = here; |
10530 | } |
10531 | } else if (n->type == NTOFD || n->type == NFROMFD) { |
10532 | fixredir(n, wordtext, 0); |
10533 | } else { |
10534 | n->nfile.fname = makename(); |
10535 | } |
10536 | } |
10537 | |
10538 | static union node * |
10539 | simplecmd(void) |
10540 | { |
10541 | union node *args, **app; |
10542 | union node *n = NULL; |
10543 | union node *vars, **vpp; |
10544 | union node **rpp, *redir; |
10545 | int savecheckkwd; |
10546 | #if ENABLE_ASH_BASH_COMPAT |
10547 | smallint double_brackets_flag = 0; |
10548 | #endif |
10549 | |
10550 | args = NULL; |
10551 | app = &args; |
10552 | vars = NULL; |
10553 | vpp = &vars; |
10554 | redir = NULL; |
10555 | rpp = &redir; |
10556 | |
10557 | savecheckkwd = CHKALIAS; |
10558 | for (;;) { |
10559 | int t; |
10560 | checkkwd = savecheckkwd; |
10561 | t = readtoken(); |
10562 | switch (t) { |
10563 | #if ENABLE_ASH_BASH_COMPAT |
10564 | case TAND: /* "&&" */ |
10565 | case TOR: /* "||" */ |
10566 | if (!double_brackets_flag) { |
10567 | tokpushback = 1; |
10568 | goto out; |
10569 | } |
10570 | wordtext = (char *) (t == TAND ? "-a" : "-o"); |
10571 | #endif |
10572 | case TWORD: |
10573 | n = stzalloc(sizeof(struct narg)); |
10574 | n->type = NARG; |
10575 | /*n->narg.next = NULL; - stzalloc did it */ |
10576 | n->narg.text = wordtext; |
10577 | #if ENABLE_ASH_BASH_COMPAT |
10578 | if (strcmp("[[", wordtext) == 0) |
10579 | double_brackets_flag = 1; |
10580 | else if (strcmp("]]", wordtext) == 0) |
10581 | double_brackets_flag = 0; |
10582 | #endif |
10583 | n->narg.backquote = backquotelist; |
10584 | if (savecheckkwd && isassignment(wordtext)) { |
10585 | *vpp = n; |
10586 | vpp = &n->narg.next; |
10587 | } else { |
10588 | *app = n; |
10589 | app = &n->narg.next; |
10590 | savecheckkwd = 0; |
10591 | } |
10592 | break; |
10593 | case TREDIR: |
10594 | *rpp = n = redirnode; |
10595 | rpp = &n->nfile.next; |
10596 | parsefname(); /* read name of redirection file */ |
10597 | break; |
10598 | case TLP: |
10599 | if (args && app == &args->narg.next |
10600 | && !vars && !redir |
10601 | ) { |
10602 | struct builtincmd *bcmd; |
10603 | const char *name; |
10604 | |
10605 | /* We have a function */ |
10606 | if (readtoken() != TRP) |
10607 | raise_error_unexpected_syntax(TRP); |
10608 | name = n->narg.text; |
10609 | if (!goodname(name) |
10610 | || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd)) |
10611 | ) { |
10612 | raise_error_syntax("bad function name"); |
10613 | } |
10614 | n->type = NDEFUN; |
10615 | checkkwd = CHKNL | CHKKWD | CHKALIAS; |
10616 | n->narg.next = parse_command(); |
10617 | return n; |
10618 | } |
10619 | /* fall through */ |
10620 | default: |
10621 | tokpushback = 1; |
10622 | goto out; |
10623 | } |
10624 | } |
10625 | out: |
10626 | *app = NULL; |
10627 | *vpp = NULL; |
10628 | *rpp = NULL; |
10629 | n = stzalloc(sizeof(struct ncmd)); |
10630 | n->type = NCMD; |
10631 | n->ncmd.args = args; |
10632 | n->ncmd.assign = vars; |
10633 | n->ncmd.redirect = redir; |
10634 | return n; |
10635 | } |
10636 | |
10637 | static union node * |
10638 | parse_command(void) |
10639 | { |
10640 | union node *n1, *n2; |
10641 | union node *ap, **app; |
10642 | union node *cp, **cpp; |
10643 | union node *redir, **rpp; |
10644 | union node **rpp2; |
10645 | int t; |
10646 | |
10647 | redir = NULL; |
10648 | rpp2 = &redir; |
10649 | |
10650 | switch (readtoken()) { |
10651 | default: |
10652 | raise_error_unexpected_syntax(-1); |
10653 | /* NOTREACHED */ |
10654 | case TIF: |
10655 | n1 = stzalloc(sizeof(struct nif)); |
10656 | n1->type = NIF; |
10657 | n1->nif.test = list(0); |
10658 | if (readtoken() != TTHEN) |
10659 | raise_error_unexpected_syntax(TTHEN); |
10660 | n1->nif.ifpart = list(0); |
10661 | n2 = n1; |
10662 | while (readtoken() == TELIF) { |
10663 | n2->nif.elsepart = stzalloc(sizeof(struct nif)); |
10664 | n2 = n2->nif.elsepart; |
10665 | n2->type = NIF; |
10666 | n2->nif.test = list(0); |
10667 | if (readtoken() != TTHEN) |
10668 | raise_error_unexpected_syntax(TTHEN); |
10669 | n2->nif.ifpart = list(0); |
10670 | } |
10671 | if (lasttoken == TELSE) |
10672 | n2->nif.elsepart = list(0); |
10673 | else { |
10674 | n2->nif.elsepart = NULL; |
10675 | tokpushback = 1; |
10676 | } |
10677 | t = TFI; |
10678 | break; |
10679 | case TWHILE: |
10680 | case TUNTIL: { |
10681 | int got; |
10682 | n1 = stzalloc(sizeof(struct nbinary)); |
10683 | n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL; |
10684 | n1->nbinary.ch1 = list(0); |
10685 | got = readtoken(); |
10686 | if (got != TDO) { |
10687 | TRACE(("expecting DO got '%s' %s\n", tokname_array[got] + 1, |
10688 | got == TWORD ? wordtext : "")); |
10689 | raise_error_unexpected_syntax(TDO); |
10690 | } |
10691 | n1->nbinary.ch2 = list(0); |
10692 | t = TDONE; |
10693 | break; |
10694 | } |
10695 | case TFOR: |
10696 | if (readtoken() != TWORD || quoteflag || !goodname(wordtext)) |
10697 | raise_error_syntax("bad for loop variable"); |
10698 | n1 = stzalloc(sizeof(struct nfor)); |
10699 | n1->type = NFOR; |
10700 | n1->nfor.var = wordtext; |
10701 | checkkwd = CHKKWD | CHKALIAS; |
10702 | if (readtoken() == TIN) { |
10703 | app = ≈ |
10704 | while (readtoken() == TWORD) { |
10705 | n2 = stzalloc(sizeof(struct narg)); |
10706 | n2->type = NARG; |
10707 | /*n2->narg.next = NULL; - stzalloc did it */ |
10708 | n2->narg.text = wordtext; |
10709 | n2->narg.backquote = backquotelist; |
10710 | *app = n2; |
10711 | app = &n2->narg.next; |
10712 | } |
10713 | *app = NULL; |
10714 | n1->nfor.args = ap; |
10715 | if (lasttoken != TNL && lasttoken != TSEMI) |
10716 | raise_error_unexpected_syntax(-1); |
10717 | } else { |
10718 | n2 = stzalloc(sizeof(struct narg)); |
10719 | n2->type = NARG; |
10720 | /*n2->narg.next = NULL; - stzalloc did it */ |
10721 | n2->narg.text = (char *)dolatstr; |
10722 | /*n2->narg.backquote = NULL;*/ |
10723 | n1->nfor.args = n2; |
10724 | /* |
10725 | * Newline or semicolon here is optional (but note |
10726 | * that the original Bourne shell only allowed NL). |
10727 | */ |
10728 | if (lasttoken != TNL && lasttoken != TSEMI) |
10729 | tokpushback = 1; |
10730 | } |
10731 | checkkwd = CHKNL | CHKKWD | CHKALIAS; |
10732 | if (readtoken() != TDO) |
10733 | raise_error_unexpected_syntax(TDO); |
10734 | n1->nfor.body = list(0); |
10735 | t = TDONE; |
10736 | break; |
10737 | case TCASE: |
10738 | n1 = stzalloc(sizeof(struct ncase)); |
10739 | n1->type = NCASE; |
10740 | if (readtoken() != TWORD) |
10741 | raise_error_unexpected_syntax(TWORD); |
10742 | n1->ncase.expr = n2 = stzalloc(sizeof(struct narg)); |
10743 | n2->type = NARG; |
10744 | /*n2->narg.next = NULL; - stzalloc did it */ |
10745 | n2->narg.text = wordtext; |
10746 | n2->narg.backquote = backquotelist; |
10747 | do { |
10748 | checkkwd = CHKKWD | CHKALIAS; |
10749 | } while (readtoken() == TNL); |
10750 | if (lasttoken != TIN) |
10751 | raise_error_unexpected_syntax(TIN); |
10752 | cpp = &n1->ncase.cases; |
10753 | next_case: |
10754 | checkkwd = CHKNL | CHKKWD; |
10755 | t = readtoken(); |
10756 | while (t != TESAC) { |
10757 | if (lasttoken == TLP) |
10758 | readtoken(); |
10759 | *cpp = cp = stzalloc(sizeof(struct nclist)); |
10760 | cp->type = NCLIST; |
10761 | app = &cp->nclist.pattern; |
10762 | for (;;) { |
10763 | *app = ap = stzalloc(sizeof(struct narg)); |
10764 | ap->type = NARG; |
10765 | /*ap->narg.next = NULL; - stzalloc did it */ |
10766 | ap->narg.text = wordtext; |
10767 | ap->narg.backquote = backquotelist; |
10768 | if (readtoken() != TPIPE) |
10769 | break; |
10770 | app = &ap->narg.next; |
10771 | readtoken(); |
10772 | } |
10773 | //ap->narg.next = NULL; |
10774 | if (lasttoken != TRP) |
10775 | raise_error_unexpected_syntax(TRP); |
10776 | cp->nclist.body = list(2); |
10777 | |
10778 | cpp = &cp->nclist.next; |
10779 | |
10780 | checkkwd = CHKNL | CHKKWD; |
10781 | t = readtoken(); |
10782 | if (t != TESAC) { |
10783 | if (t != TENDCASE) |
10784 | raise_error_unexpected_syntax(TENDCASE); |
10785 | goto next_case; |
10786 | } |
10787 | } |
10788 | *cpp = NULL; |
10789 | goto redir; |
10790 | case TLP: |
10791 | n1 = stzalloc(sizeof(struct nredir)); |
10792 | n1->type = NSUBSHELL; |
10793 | n1->nredir.n = list(0); |
10794 | /*n1->nredir.redirect = NULL; - stzalloc did it */ |
10795 | t = TRP; |
10796 | break; |
10797 | case TBEGIN: |
10798 | n1 = list(0); |
10799 | t = TEND; |
10800 | break; |
10801 | case TWORD: |
10802 | case TREDIR: |
10803 | tokpushback = 1; |
10804 | return simplecmd(); |
10805 | } |
10806 | |
10807 | if (readtoken() != t) |
10808 | raise_error_unexpected_syntax(t); |
10809 | |
10810 | redir: |
10811 | /* Now check for redirection which may follow command */ |
10812 | checkkwd = CHKKWD | CHKALIAS; |
10813 | rpp = rpp2; |
10814 | while (readtoken() == TREDIR) { |
10815 | *rpp = n2 = redirnode; |
10816 | rpp = &n2->nfile.next; |
10817 | parsefname(); |
10818 | } |
10819 | tokpushback = 1; |
10820 | *rpp = NULL; |
10821 | if (redir) { |
10822 | if (n1->type != NSUBSHELL) { |
10823 | n2 = stzalloc(sizeof(struct nredir)); |
10824 | n2->type = NREDIR; |
10825 | n2->nredir.n = n1; |
10826 | n1 = n2; |
10827 | } |
10828 | n1->nredir.redirect = redir; |
10829 | } |
10830 | return n1; |
10831 | } |
10832 | |
10833 | #if ENABLE_ASH_BASH_COMPAT |
10834 | static int decode_dollar_squote(void) |
10835 | { |
10836 | static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567"; |
10837 | int c, cnt; |
10838 | char *p; |
10839 | char buf[4]; |
10840 | |
10841 | c = pgetc(); |
10842 | p = strchr(C_escapes, c); |
10843 | if (p) { |
10844 | buf[0] = c; |
10845 | p = buf; |
10846 | cnt = 3; |
10847 | if ((unsigned char)(c - '0') <= 7) { /* \ooo */ |
10848 | do { |
10849 | c = pgetc(); |
10850 | *++p = c; |
10851 | } while ((unsigned char)(c - '0') <= 7 && --cnt); |
10852 | pungetc(); |
10853 | } else if (c == 'x') { /* \xHH */ |
10854 | do { |
10855 | c = pgetc(); |
10856 | *++p = c; |
10857 | } while (isxdigit(c) && --cnt); |
10858 | pungetc(); |
10859 | if (cnt == 3) { /* \x but next char is "bad" */ |
10860 | c = 'x'; |
10861 | goto unrecognized; |
10862 | } |
10863 | } else { /* simple seq like \\ or \t */ |
10864 | p++; |
10865 | } |
10866 | *p = '\0'; |
10867 | p = buf; |
10868 | c = bb_process_escape_sequence((void*)&p); |
10869 | } else { /* unrecognized "\z": print both chars unless ' or " */ |
10870 | if (c != '\'' && c != '"') { |
10871 | unrecognized: |
10872 | c |= 0x100; /* "please encode \, then me" */ |
10873 | } |
10874 | } |
10875 | return c; |
10876 | } |
10877 | #endif |
10878 | |
10879 | /* |
10880 | * If eofmark is NULL, read a word or a redirection symbol. If eofmark |
10881 | * is not NULL, read a here document. In the latter case, eofmark is the |
10882 | * word which marks the end of the document and striptabs is true if |
10883 | * leading tabs should be stripped from the document. The argument c |
10884 | * is the first character of the input token or document. |
10885 | * |
10886 | * Because C does not have internal subroutines, I have simulated them |
10887 | * using goto's to implement the subroutine linkage. The following macros |
10888 | * will run code that appears at the end of readtoken1. |
10889 | */ |
10890 | #define CHECKEND() {goto checkend; checkend_return:;} |
10891 | #define PARSEREDIR() {goto parseredir; parseredir_return:;} |
10892 | #define PARSESUB() {goto parsesub; parsesub_return:;} |
10893 | #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;} |
10894 | #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;} |
10895 | #define PARSEARITH() {goto parsearith; parsearith_return:;} |
10896 | static int |
10897 | readtoken1(int c, int syntax, char *eofmark, int striptabs) |
10898 | { |
10899 | /* NB: syntax parameter fits into smallint */ |
10900 | /* c parameter is an unsigned char or PEOF or PEOA */ |
10901 | char *out; |
10902 | int len; |
10903 | char line[EOFMARKLEN + 1]; |
10904 | struct nodelist *bqlist; |
10905 | smallint quotef; |
10906 | smallint dblquote; |
10907 | smallint oldstyle; |
10908 | smallint prevsyntax; /* syntax before arithmetic */ |
10909 | #if ENABLE_ASH_EXPAND_PRMT |
10910 | smallint pssyntax; /* we are expanding a prompt string */ |
10911 | #endif |
10912 | int varnest; /* levels of variables expansion */ |
10913 | int arinest; /* levels of arithmetic expansion */ |
10914 | int parenlevel; /* levels of parens in arithmetic */ |
10915 | int dqvarnest; /* levels of variables expansion within double quotes */ |
10916 | |
10917 | IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;) |
10918 | |
10919 | #if __GNUC__ |
10920 | /* Avoid longjmp clobbering */ |
10921 | (void) &out; |
10922 | (void) "ef; |
10923 | (void) &dblquote; |
10924 | (void) &varnest; |
10925 | (void) &arinest; |
10926 | (void) &parenlevel; |
10927 | (void) &dqvarnest; |
10928 | (void) &oldstyle; |
10929 | (void) &prevsyntax; |
10930 | (void) &syntax; |
10931 | #endif |
10932 | startlinno = g_parsefile->linno; |
10933 | bqlist = NULL; |
10934 | quotef = 0; |
10935 | oldstyle = 0; |
10936 | prevsyntax = 0; |
10937 | #if ENABLE_ASH_EXPAND_PRMT |
10938 | pssyntax = (syntax == PSSYNTAX); |
10939 | if (pssyntax) |
10940 | syntax = DQSYNTAX; |
10941 | #endif |
10942 | dblquote = (syntax == DQSYNTAX); |
10943 | varnest = 0; |
10944 | arinest = 0; |
10945 | parenlevel = 0; |
10946 | dqvarnest = 0; |
10947 | |
10948 | STARTSTACKSTR(out); |
10949 | loop: |
10950 | /* For each line, until end of word */ |
10951 | { |
10952 | CHECKEND(); /* set c to PEOF if at end of here document */ |
10953 | for (;;) { /* until end of line or end of word */ |
10954 | CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */ |
10955 | switch (SIT(c, syntax)) { |
10956 | case CNL: /* '\n' */ |
10957 | if (syntax == BASESYNTAX) |
10958 | goto endword; /* exit outer loop */ |
10959 | USTPUTC(c, out); |
10960 | g_parsefile->linno++; |
10961 | if (doprompt) |
10962 | setprompt(2); |
10963 | c = pgetc(); |
10964 | goto loop; /* continue outer loop */ |
10965 | case CWORD: |
10966 | USTPUTC(c, out); |
10967 | break; |
10968 | case CCTL: |
10969 | if (eofmark == NULL || dblquote) |
10970 | USTPUTC(CTLESC, out); |
10971 | #if ENABLE_ASH_BASH_COMPAT |
10972 | if (c == '\\' && bash_dollar_squote) { |
10973 | c = decode_dollar_squote(); |
10974 | if (c & 0x100) { |
10975 | USTPUTC('\\', out); |
10976 | c = (unsigned char)c; |
10977 | } |
10978 | } |
10979 | #endif |
10980 | USTPUTC(c, out); |
10981 | break; |
10982 | case CBACK: /* backslash */ |
10983 | c = pgetc_without_PEOA(); |
10984 | if (c == PEOF) { |
10985 | USTPUTC(CTLESC, out); |
10986 | USTPUTC('\\', out); |
10987 | pungetc(); |
10988 | } else if (c == '\n') { |
10989 | if (doprompt) |
10990 | setprompt(2); |
10991 | } else { |
10992 | #if ENABLE_ASH_EXPAND_PRMT |
10993 | if (c == '$' && pssyntax) { |
10994 | USTPUTC(CTLESC, out); |
10995 | USTPUTC('\\', out); |
10996 | } |
10997 | #endif |
10998 | if (dblquote && c != '\\' |
10999 | && c != '`' && c != '$' |
11000 | && (c != '"' || eofmark != NULL) |
11001 | ) { |
11002 | USTPUTC(CTLESC, out); |
11003 | USTPUTC('\\', out); |
11004 | } |
11005 | if (SIT(c, SQSYNTAX) == CCTL) |
11006 | USTPUTC(CTLESC, out); |
11007 | USTPUTC(c, out); |
11008 | quotef = 1; |
11009 | } |
11010 | break; |
11011 | case CSQUOTE: |
11012 | syntax = SQSYNTAX; |
11013 | quotemark: |
11014 | if (eofmark == NULL) { |
11015 | USTPUTC(CTLQUOTEMARK, out); |
11016 | } |
11017 | break; |
11018 | case CDQUOTE: |
11019 | syntax = DQSYNTAX; |
11020 | dblquote = 1; |
11021 | goto quotemark; |
11022 | case CENDQUOTE: |
11023 | IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;) |
11024 | if (eofmark != NULL && arinest == 0 |
11025 | && varnest == 0 |
11026 | ) { |
11027 | USTPUTC(c, out); |
11028 | } else { |
11029 | if (dqvarnest == 0) { |
11030 | syntax = BASESYNTAX; |
11031 | dblquote = 0; |
11032 | } |
11033 | quotef = 1; |
11034 | goto quotemark; |
11035 | } |
11036 | break; |
11037 | case CVAR: /* '$' */ |
11038 | PARSESUB(); /* parse substitution */ |
11039 | break; |
11040 | case CENDVAR: /* '}' */ |
11041 | if (varnest > 0) { |
11042 | varnest--; |
11043 | if (dqvarnest > 0) { |
11044 | dqvarnest--; |
11045 | } |
11046 | USTPUTC(CTLENDVAR, out); |
11047 | } else { |
11048 | USTPUTC(c, out); |
11049 | } |
11050 | break; |
11051 | #if ENABLE_SH_MATH_SUPPORT |
11052 | case CLP: /* '(' in arithmetic */ |
11053 | parenlevel++; |
11054 | USTPUTC(c, out); |
11055 | break; |
11056 | case CRP: /* ')' in arithmetic */ |
11057 | if (parenlevel > 0) { |
11058 | USTPUTC(c, out); |
11059 | --parenlevel; |
11060 | } else { |
11061 | if (pgetc() == ')') { |
11062 | if (--arinest == 0) { |
11063 | USTPUTC(CTLENDARI, out); |
11064 | syntax = prevsyntax; |
11065 | dblquote = (syntax == DQSYNTAX); |
11066 | } else |
11067 | USTPUTC(')', out); |
11068 | } else { |
11069 | /* |
11070 | * unbalanced parens |
11071 | * (don't 2nd guess - no error) |
11072 | */ |
11073 | pungetc(); |
11074 | USTPUTC(')', out); |
11075 | } |
11076 | } |
11077 | break; |
11078 | #endif |
11079 | case CBQUOTE: /* '`' */ |
11080 | PARSEBACKQOLD(); |
11081 | break; |
11082 | case CENDFILE: |
11083 | goto endword; /* exit outer loop */ |
11084 | case CIGN: |
11085 | break; |
11086 | default: |
11087 | if (varnest == 0) { |
11088 | #if ENABLE_ASH_BASH_COMPAT |
11089 | if (c == '&') { |
11090 | if (pgetc() == '>') |
11091 | c = 0x100 + '>'; /* flag &> */ |
11092 | pungetc(); |
11093 | } |
11094 | #endif |
11095 | goto endword; /* exit outer loop */ |
11096 | } |
11097 | IF_ASH_ALIAS(if (c != PEOA)) |
11098 | USTPUTC(c, out); |
11099 | |
11100 | } |
11101 | c = pgetc_fast(); |
11102 | } /* for (;;) */ |
11103 | } |
11104 | endword: |
11105 | #if ENABLE_SH_MATH_SUPPORT |
11106 | if (syntax == ARISYNTAX) |
11107 | raise_error_syntax("missing '))'"); |
11108 | #endif |
11109 | if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL) |
11110 | raise_error_syntax("unterminated quoted string"); |
11111 | if (varnest != 0) { |
11112 | startlinno = g_parsefile->linno; |
11113 | /* { */ |
11114 | raise_error_syntax("missing '}'"); |
11115 | } |
11116 | USTPUTC('\0', out); |
11117 | len = out - (char *)stackblock(); |
11118 | out = stackblock(); |
11119 | if (eofmark == NULL) { |
11120 | if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>')) |
11121 | && quotef == 0 |
11122 | ) { |
11123 | if (isdigit_str9(out)) { |
11124 | PARSEREDIR(); /* passed as params: out, c */ |
11125 | lasttoken = TREDIR; |
11126 | return lasttoken; |
11127 | } |
11128 | /* else: non-number X seen, interpret it |
11129 | * as "NNNX>file" = "NNNX >file" */ |
11130 | } |
11131 | pungetc(); |
11132 | } |
11133 | quoteflag = quotef; |
11134 | backquotelist = bqlist; |
11135 | grabstackblock(len); |
11136 | wordtext = out; |
11137 | lasttoken = TWORD; |
11138 | return lasttoken; |
11139 | /* end of readtoken routine */ |
11140 | |
11141 | /* |
11142 | * Check to see whether we are at the end of the here document. When this |
11143 | * is called, c is set to the first character of the next input line. If |
11144 | * we are at the end of the here document, this routine sets the c to PEOF. |
11145 | */ |
11146 | checkend: { |
11147 | if (eofmark) { |
11148 | #if ENABLE_ASH_ALIAS |
11149 | if (c == PEOA) |
11150 | c = pgetc_without_PEOA(); |
11151 | #endif |
11152 | if (striptabs) { |
11153 | while (c == '\t') { |
11154 | c = pgetc_without_PEOA(); |
11155 | } |
11156 | } |
11157 | if (c == *eofmark) { |
11158 | if (pfgets(line, sizeof(line)) != NULL) { |
11159 | char *p, *q; |
11160 | |
11161 | p = line; |
11162 | for (q = eofmark + 1; *q && *p == *q; p++, q++) |
11163 | continue; |
11164 | if (*p == '\n' && *q == '\0') { |
11165 | c = PEOF; |
11166 | g_parsefile->linno++; |
11167 | needprompt = doprompt; |
11168 | } else { |
11169 | pushstring(line, NULL); |
11170 | } |
11171 | } |
11172 | } |
11173 | } |
11174 | goto checkend_return; |
11175 | } |
11176 | |
11177 | /* |
11178 | * Parse a redirection operator. The variable "out" points to a string |
11179 | * specifying the fd to be redirected. The variable "c" contains the |
11180 | * first character of the redirection operator. |
11181 | */ |
11182 | parseredir: { |
11183 | /* out is already checked to be a valid number or "" */ |
11184 | int fd = (*out == '\0' ? -1 : atoi(out)); |
11185 | union node *np; |
11186 | |
11187 | np = stzalloc(sizeof(struct nfile)); |
11188 | if (c == '>') { |
11189 | np->nfile.fd = 1; |
11190 | c = pgetc(); |
11191 | if (c == '>') |
11192 | np->type = NAPPEND; |
11193 | else if (c == '|') |
11194 | np->type = NCLOBBER; |
11195 | else if (c == '&') |
11196 | np->type = NTOFD; |
11197 | /* it also can be NTO2 (>&file), but we can't figure it out yet */ |
11198 | else { |
11199 | np->type = NTO; |
11200 | pungetc(); |
11201 | } |
11202 | } |
11203 | #if ENABLE_ASH_BASH_COMPAT |
11204 | else if (c == 0x100 + '>') { /* this flags &> redirection */ |
11205 | np->nfile.fd = 1; |
11206 | pgetc(); /* this is '>', no need to check */ |
11207 | np->type = NTO2; |
11208 | } |
11209 | #endif |
11210 | else { /* c == '<' */ |
11211 | /*np->nfile.fd = 0; - stzalloc did it */ |
11212 | c = pgetc(); |
11213 | switch (c) { |
11214 | case '<': |
11215 | if (sizeof(struct nfile) != sizeof(struct nhere)) { |
11216 | np = stzalloc(sizeof(struct nhere)); |
11217 | /*np->nfile.fd = 0; - stzalloc did it */ |
11218 | } |
11219 | np->type = NHERE; |
11220 | heredoc = stzalloc(sizeof(struct heredoc)); |
11221 | heredoc->here = np; |
11222 | c = pgetc(); |
11223 | if (c == '-') { |
11224 | heredoc->striptabs = 1; |
11225 | } else { |
11226 | /*heredoc->striptabs = 0; - stzalloc did it */ |
11227 | pungetc(); |
11228 | } |
11229 | break; |
11230 | |
11231 | case '&': |
11232 | np->type = NFROMFD; |
11233 | break; |
11234 | |
11235 | case '>': |
11236 | np->type = NFROMTO; |
11237 | break; |
11238 | |
11239 | default: |
11240 | np->type = NFROM; |
11241 | pungetc(); |
11242 | break; |
11243 | } |
11244 | } |
11245 | if (fd >= 0) |
11246 | np->nfile.fd = fd; |
11247 | redirnode = np; |
11248 | goto parseredir_return; |
11249 | } |
11250 | |
11251 | /* |
11252 | * Parse a substitution. At this point, we have read the dollar sign |
11253 | * and nothing else. |
11254 | */ |
11255 | |
11256 | /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise |
11257 | * (assuming ascii char codes, as the original implementation did) */ |
11258 | #define is_special(c) \ |
11259 | (((unsigned)(c) - 33 < 32) \ |
11260 | && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1)) |
11261 | parsesub: { |
11262 | unsigned char subtype; |
11263 | int typeloc; |
11264 | int flags; |
11265 | char *p; |
11266 | static const char types[] ALIGN1 = "}-+?="; |
11267 | |
11268 | c = pgetc(); |
11269 | if (c > 255 /* PEOA or PEOF */ |
11270 | || (c != '(' && c != '{' && !is_name(c) && !is_special(c)) |
11271 | ) { |
11272 | #if ENABLE_ASH_BASH_COMPAT |
11273 | if (c == '\'') |
11274 | bash_dollar_squote = 1; |
11275 | else |
11276 | #endif |
11277 | USTPUTC('$', out); |
11278 | pungetc(); |
11279 | } else if (c == '(') { /* $(command) or $((arith)) */ |
11280 | if (pgetc() == '(') { |
11281 | #if ENABLE_SH_MATH_SUPPORT |
11282 | PARSEARITH(); |
11283 | #else |
11284 | raise_error_syntax("you disabled math support for $((arith)) syntax"); |
11285 | #endif |
11286 | } else { |
11287 | pungetc(); |
11288 | PARSEBACKQNEW(); |
11289 | } |
11290 | } else { |
11291 | USTPUTC(CTLVAR, out); |
11292 | typeloc = out - (char *)stackblock(); |
11293 | USTPUTC(VSNORMAL, out); |
11294 | subtype = VSNORMAL; |
11295 | if (c == '{') { |
11296 | c = pgetc(); |
11297 | if (c == '#') { |
11298 | c = pgetc(); |
11299 | if (c == '}') |
11300 | c = '#'; |
11301 | else |
11302 | subtype = VSLENGTH; |
11303 | } else |
11304 | subtype = 0; |
11305 | } |
11306 | if (c <= 255 /* not PEOA or PEOF */ && is_name(c)) { |
11307 | do { |
11308 | STPUTC(c, out); |
11309 | c = pgetc(); |
11310 | } while (c <= 255 /* not PEOA or PEOF */ && is_in_name(c)); |
11311 | } else if (isdigit(c)) { |
11312 | do { |
11313 | STPUTC(c, out); |
11314 | c = pgetc(); |
11315 | } while (isdigit(c)); |
11316 | } else if (is_special(c)) { |
11317 | USTPUTC(c, out); |
11318 | c = pgetc(); |
11319 | } else { |
11320 | badsub: |
11321 | raise_error_syntax("bad substitution"); |
11322 | } |
11323 | if (c != '}' && subtype == VSLENGTH) |
11324 | goto badsub; |
11325 | |
11326 | STPUTC('=', out); |
11327 | flags = 0; |
11328 | if (subtype == 0) { |
11329 | switch (c) { |
11330 | case ':': |
11331 | c = pgetc(); |
11332 | #if ENABLE_ASH_BASH_COMPAT |
11333 | if (c == ':' || c == '$' || isdigit(c)) { |
11334 | pungetc(); |
11335 | subtype = VSSUBSTR; |
11336 | break; |
11337 | } |
11338 | #endif |
11339 | flags = VSNUL; |
11340 | /*FALLTHROUGH*/ |
11341 | default: |
11342 | p = strchr(types, c); |
11343 | if (p == NULL) |
11344 | goto badsub; |
11345 | subtype = p - types + VSNORMAL; |
11346 | break; |
11347 | case '%': |
11348 | case '#': { |
11349 | int cc = c; |
11350 | subtype = c == '#' ? VSTRIMLEFT : VSTRIMRIGHT; |
11351 | c = pgetc(); |
11352 | if (c == cc) |
11353 | subtype++; |
11354 | else |
11355 | pungetc(); |
11356 | break; |
11357 | } |
11358 | #if ENABLE_ASH_BASH_COMPAT |
11359 | case '/': |
11360 | subtype = VSREPLACE; |
11361 | c = pgetc(); |
11362 | if (c == '/') |
11363 | subtype++; /* VSREPLACEALL */ |
11364 | else |
11365 | pungetc(); |
11366 | break; |
11367 | #endif |
11368 | } |
11369 | } else { |
11370 | pungetc(); |
11371 | } |
11372 | if (dblquote || arinest) |
11373 | flags |= VSQUOTE; |
11374 | ((unsigned char *)stackblock())[typeloc] = subtype | flags; |
11375 | if (subtype != VSNORMAL) { |
11376 | varnest++; |
11377 | if (dblquote || arinest) { |
11378 | dqvarnest++; |
11379 | } |
11380 | } |
11381 | } |
11382 | goto parsesub_return; |
11383 | } |
11384 | |
11385 | /* |
11386 | * Called to parse command substitutions. Newstyle is set if the command |
11387 | * is enclosed inside $(...); nlpp is a pointer to the head of the linked |
11388 | * list of commands (passed by reference), and savelen is the number of |
11389 | * characters on the top of the stack which must be preserved. |
11390 | */ |
11391 | parsebackq: { |
11392 | struct nodelist **nlpp; |
11393 | smallint savepbq; |
11394 | union node *n; |
11395 | char *volatile str; |
11396 | struct jmploc jmploc; |
11397 | struct jmploc *volatile savehandler; |
11398 | size_t savelen; |
11399 | smallint saveprompt = 0; |
11400 | |
11401 | #ifdef __GNUC__ |
11402 | (void) &saveprompt; |
11403 | #endif |
11404 | savepbq = parsebackquote; |
11405 | if (setjmp(jmploc.loc)) { |
11406 | free(str); |
11407 | parsebackquote = 0; |
11408 | exception_handler = savehandler; |
11409 | longjmp(exception_handler->loc, 1); |
11410 | } |
11411 | INT_OFF; |
11412 | str = NULL; |
11413 | savelen = out - (char *)stackblock(); |
11414 | if (savelen > 0) { |
11415 | str = ckmalloc(savelen); |
11416 | memcpy(str, stackblock(), savelen); |
11417 | } |
11418 | savehandler = exception_handler; |
11419 | exception_handler = &jmploc; |
11420 | INT_ON; |
11421 | if (oldstyle) { |
11422 | /* We must read until the closing backquote, giving special |
11423 | treatment to some slashes, and then push the string and |
11424 | reread it as input, interpreting it normally. */ |
11425 | char *pout; |
11426 | int pc; |
11427 | size_t psavelen; |
11428 | char *pstr; |
11429 | |
11430 | |
11431 | STARTSTACKSTR(pout); |
11432 | for (;;) { |
11433 | if (needprompt) { |
11434 | setprompt(2); |
11435 | } |
11436 | pc = pgetc(); |
11437 | switch (pc) { |
11438 | case '`': |
11439 | goto done; |
11440 | |
11441 | case '\\': |
11442 | pc = pgetc(); |
11443 | if (pc == '\n') { |
11444 | g_parsefile->linno++; |
11445 | if (doprompt) |
11446 | setprompt(2); |
11447 | /* |
11448 | * If eating a newline, avoid putting |
11449 | * the newline into the new character |
11450 | * stream (via the STPUTC after the |
11451 | * switch). |
11452 | */ |
11453 | continue; |
11454 | } |
11455 | if (pc != '\\' && pc != '`' && pc != '$' |
11456 | && (!dblquote || pc != '"') |
11457 | ) { |
11458 | STPUTC('\\', pout); |
11459 | } |
11460 | if (pc <= 255 /* not PEOA or PEOF */) { |
11461 | break; |
11462 | } |
11463 | /* fall through */ |
11464 | |
11465 | case PEOF: |
11466 | IF_ASH_ALIAS(case PEOA:) |
11467 | startlinno = g_parsefile->linno; |
11468 | raise_error_syntax("EOF in backquote substitution"); |
11469 | |
11470 | case '\n': |
11471 | g_parsefile->linno++; |
11472 | needprompt = doprompt; |
11473 | break; |
11474 | |
11475 | default: |
11476 | break; |
11477 | } |
11478 | STPUTC(pc, pout); |
11479 | } |
11480 | done: |
11481 | STPUTC('\0', pout); |
11482 | psavelen = pout - (char *)stackblock(); |
11483 | if (psavelen > 0) { |
11484 | pstr = grabstackstr(pout); |
11485 | setinputstring(pstr); |
11486 | } |
11487 | } |
11488 | nlpp = &bqlist; |
11489 | while (*nlpp) |
11490 | nlpp = &(*nlpp)->next; |
11491 | *nlpp = stzalloc(sizeof(**nlpp)); |
11492 | /* (*nlpp)->next = NULL; - stzalloc did it */ |
11493 | parsebackquote = oldstyle; |
11494 | |
11495 | if (oldstyle) { |
11496 | saveprompt = doprompt; |
11497 | doprompt = 0; |
11498 | } |
11499 | |
11500 | n = list(2); |
11501 | |
11502 | if (oldstyle) |
11503 | doprompt = saveprompt; |
11504 | else if (readtoken() != TRP) |
11505 | raise_error_unexpected_syntax(TRP); |
11506 | |
11507 | (*nlpp)->n = n; |
11508 | if (oldstyle) { |
11509 | /* |
11510 | * Start reading from old file again, ignoring any pushed back |
11511 | * tokens left from the backquote parsing |
11512 | */ |
11513 | popfile(); |
11514 | tokpushback = 0; |
11515 | } |
11516 | while (stackblocksize() <= savelen) |
11517 | growstackblock(); |
11518 | STARTSTACKSTR(out); |
11519 | if (str) { |
11520 | memcpy(out, str, savelen); |
11521 | STADJUST(savelen, out); |
11522 | INT_OFF; |
11523 | free(str); |
11524 | str = NULL; |
11525 | INT_ON; |
11526 | } |
11527 | parsebackquote = savepbq; |
11528 | exception_handler = savehandler; |
11529 | if (arinest || dblquote) |
11530 | USTPUTC(CTLBACKQ | CTLQUOTE, out); |
11531 | else |
11532 | USTPUTC(CTLBACKQ, out); |
11533 | if (oldstyle) |
11534 | goto parsebackq_oldreturn; |
11535 | goto parsebackq_newreturn; |
11536 | } |
11537 | |
11538 | #if ENABLE_SH_MATH_SUPPORT |
11539 | /* |
11540 | * Parse an arithmetic expansion (indicate start of one and set state) |
11541 | */ |
11542 | parsearith: { |
11543 | if (++arinest == 1) { |
11544 | prevsyntax = syntax; |
11545 | syntax = ARISYNTAX; |
11546 | USTPUTC(CTLARI, out); |
11547 | if (dblquote) |
11548 | USTPUTC('"', out); |
11549 | else |
11550 | USTPUTC(' ', out); |
11551 | } else { |
11552 | /* |
11553 | * we collapse embedded arithmetic expansion to |
11554 | * parenthesis, which should be equivalent |
11555 | */ |
11556 | USTPUTC('(', out); |
11557 | } |
11558 | goto parsearith_return; |
11559 | } |
11560 | #endif |
11561 | |
11562 | } /* end of readtoken */ |
11563 | |
11564 | /* |
11565 | * Read the next input token. |
11566 | * If the token is a word, we set backquotelist to the list of cmds in |
11567 | * backquotes. We set quoteflag to true if any part of the word was |
11568 | * quoted. |
11569 | * If the token is TREDIR, then we set redirnode to a structure containing |
11570 | * the redirection. |
11571 | * In all cases, the variable startlinno is set to the number of the line |
11572 | * on which the token starts. |
11573 | * |
11574 | * [Change comment: here documents and internal procedures] |
11575 | * [Readtoken shouldn't have any arguments. Perhaps we should make the |
11576 | * word parsing code into a separate routine. In this case, readtoken |
11577 | * doesn't need to have any internal procedures, but parseword does. |
11578 | * We could also make parseoperator in essence the main routine, and |
11579 | * have parseword (readtoken1?) handle both words and redirection.] |
11580 | */ |
11581 | #define NEW_xxreadtoken |
11582 | #ifdef NEW_xxreadtoken |
11583 | /* singles must be first! */ |
11584 | static const char xxreadtoken_chars[7] ALIGN1 = { |
11585 | '\n', '(', ')', /* singles */ |
11586 | '&', '|', ';', /* doubles */ |
11587 | 0 |
11588 | }; |
11589 | |
11590 | #define xxreadtoken_singles 3 |
11591 | #define xxreadtoken_doubles 3 |
11592 | |
11593 | static const char xxreadtoken_tokens[] ALIGN1 = { |
11594 | TNL, TLP, TRP, /* only single occurrence allowed */ |
11595 | TBACKGND, TPIPE, TSEMI, /* if single occurrence */ |
11596 | TEOF, /* corresponds to trailing nul */ |
11597 | TAND, TOR, TENDCASE /* if double occurrence */ |
11598 | }; |
11599 | |
11600 | static int |
11601 | xxreadtoken(void) |
11602 | { |
11603 | int c; |
11604 | |
11605 | if (tokpushback) { |
11606 | tokpushback = 0; |
11607 | return lasttoken; |
11608 | } |
11609 | if (needprompt) { |
11610 | setprompt(2); |
11611 | } |
11612 | startlinno = g_parsefile->linno; |
11613 | for (;;) { /* until token or start of word found */ |
11614 | c = pgetc_fast(); |
11615 | if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA)) |
11616 | continue; |
11617 | |
11618 | if (c == '#') { |
11619 | while ((c = pgetc()) != '\n' && c != PEOF) |
11620 | continue; |
11621 | pungetc(); |
11622 | } else if (c == '\\') { |
11623 | if (pgetc() != '\n') { |
11624 | pungetc(); |
11625 | break; /* return readtoken1(...) */ |
11626 | } |
11627 | startlinno = ++g_parsefile->linno; |
11628 | if (doprompt) |
11629 | setprompt(2); |
11630 | } else { |
11631 | const char *p; |
11632 | |
11633 | p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1; |
11634 | if (c != PEOF) { |
11635 | if (c == '\n') { |
11636 | g_parsefile->linno++; |
11637 | needprompt = doprompt; |
11638 | } |
11639 | |
11640 | p = strchr(xxreadtoken_chars, c); |
11641 | if (p == NULL) |
11642 | break; /* return readtoken1(...) */ |
11643 | |
11644 | if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) { |
11645 | int cc = pgetc(); |
11646 | if (cc == c) { /* double occurrence? */ |
11647 | p += xxreadtoken_doubles + 1; |
11648 | } else { |
11649 | pungetc(); |
11650 | #if ENABLE_ASH_BASH_COMPAT |
11651 | if (c == '&' && cc == '>') /* &> */ |
11652 | break; /* return readtoken1(...) */ |
11653 | #endif |
11654 | } |
11655 | } |
11656 | } |
11657 | lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars]; |
11658 | return lasttoken; |
11659 | } |
11660 | } /* for (;;) */ |
11661 | |
11662 | return readtoken1(c, BASESYNTAX, (char *) NULL, 0); |
11663 | } |
11664 | #else /* old xxreadtoken */ |
11665 | #define RETURN(token) return lasttoken = token |
11666 | static int |
11667 | xxreadtoken(void) |
11668 | { |
11669 | int c; |
11670 | |
11671 | if (tokpushback) { |
11672 | tokpushback = 0; |
11673 | return lasttoken; |
11674 | } |
11675 | if (needprompt) { |
11676 | setprompt(2); |
11677 | } |
11678 | startlinno = g_parsefile->linno; |
11679 | for (;;) { /* until token or start of word found */ |
11680 | c = pgetc_fast(); |
11681 | switch (c) { |
11682 | case ' ': case '\t': |
11683 | IF_ASH_ALIAS(case PEOA:) |
11684 | continue; |
11685 | case '#': |
11686 | while ((c = pgetc()) != '\n' && c != PEOF) |
11687 | continue; |
11688 | pungetc(); |
11689 | continue; |
11690 | case '\\': |
11691 | if (pgetc() == '\n') { |
11692 | startlinno = ++g_parsefile->linno; |
11693 | if (doprompt) |
11694 | setprompt(2); |
11695 | continue; |
11696 | } |
11697 | pungetc(); |
11698 | goto breakloop; |
11699 | case '\n': |
11700 | g_parsefile->linno++; |
11701 | needprompt = doprompt; |
11702 | RETURN(TNL); |
11703 | case PEOF: |
11704 | RETURN(TEOF); |
11705 | case '&': |
11706 | if (pgetc() == '&') |
11707 | RETURN(TAND); |
11708 | pungetc(); |
11709 | RETURN(TBACKGND); |
11710 | case '|': |
11711 | if (pgetc() == '|') |
11712 | RETURN(TOR); |
11713 | pungetc(); |
11714 | RETURN(TPIPE); |
11715 | case ';': |
11716 | if (pgetc() == ';') |
11717 | RETURN(TENDCASE); |
11718 | pungetc(); |
11719 | RETURN(TSEMI); |
11720 | case '(': |
11721 | RETURN(TLP); |
11722 | case ')': |
11723 | RETURN(TRP); |
11724 | default: |
11725 | goto breakloop; |
11726 | } |
11727 | } |
11728 | breakloop: |
11729 | return readtoken1(c, BASESYNTAX, (char *)NULL, 0); |
11730 | #undef RETURN |
11731 | } |
11732 | #endif /* old xxreadtoken */ |
11733 | |
11734 | static int |
11735 | readtoken(void) |
11736 | { |
11737 | int t; |
11738 | #if DEBUG |
11739 | smallint alreadyseen = tokpushback; |
11740 | #endif |
11741 | |
11742 | #if ENABLE_ASH_ALIAS |
11743 | top: |
11744 | #endif |
11745 | |
11746 | t = xxreadtoken(); |
11747 | |
11748 | /* |
11749 | * eat newlines |
11750 | */ |
11751 | if (checkkwd & CHKNL) { |
11752 | while (t == TNL) { |
11753 | parseheredoc(); |
11754 | t = xxreadtoken(); |
11755 | } |
11756 | } |
11757 | |
11758 | if (t != TWORD || quoteflag) { |
11759 | goto out; |
11760 | } |
11761 | |
11762 | /* |
11763 | * check for keywords |
11764 | */ |
11765 | if (checkkwd & CHKKWD) { |
11766 | const char *const *pp; |
11767 | |
11768 | pp = findkwd(wordtext); |
11769 | if (pp) { |
11770 | lasttoken = t = pp - tokname_array; |
11771 | TRACE(("keyword '%s' recognized\n", tokname_array[t] + 1)); |
11772 | goto out; |
11773 | } |
11774 | } |
11775 | |
11776 | if (checkkwd & CHKALIAS) { |
11777 | #if ENABLE_ASH_ALIAS |
11778 | struct alias *ap; |
11779 | ap = lookupalias(wordtext, 1); |
11780 | if (ap != NULL) { |
11781 | if (*ap->val) { |
11782 | pushstring(ap->val, ap); |
11783 | } |
11784 | goto top; |
11785 | } |
11786 | #endif |
11787 | } |
11788 | out: |
11789 | checkkwd = 0; |
11790 | #if DEBUG |
11791 | if (!alreadyseen) |
11792 | TRACE(("token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : "")); |
11793 | else |
11794 | TRACE(("reread token '%s' %s\n", tokname_array[t] + 1, t == TWORD ? wordtext : "")); |
11795 | #endif |
11796 | return t; |
11797 | } |
11798 | |
11799 | static char |
11800 | peektoken(void) |
11801 | { |
11802 | int t; |
11803 | |
11804 | t = readtoken(); |
11805 | tokpushback = 1; |
11806 | return tokname_array[t][0]; |
11807 | } |
11808 | |
11809 | /* |
11810 | * Read and parse a command. Returns NODE_EOF on end of file. |
11811 | * (NULL is a valid parse tree indicating a blank line.) |
11812 | */ |
11813 | static union node * |
11814 | parsecmd(int interact) |
11815 | { |
11816 | int t; |
11817 | |
11818 | tokpushback = 0; |
11819 | doprompt = interact; |
11820 | if (doprompt) |
11821 | setprompt(doprompt); |
11822 | needprompt = 0; |
11823 | t = readtoken(); |
11824 | if (t == TEOF) |
11825 | return NODE_EOF; |
11826 | if (t == TNL) |
11827 | return NULL; |
11828 | tokpushback = 1; |
11829 | return list(1); |
11830 | } |
11831 | |
11832 | /* |
11833 | * Input any here documents. |
11834 | */ |
11835 | static void |
11836 | parseheredoc(void) |
11837 | { |
11838 | struct heredoc *here; |
11839 | union node *n; |
11840 | |
11841 | here = heredoclist; |
11842 | heredoclist = NULL; |
11843 | |
11844 | while (here) { |
11845 | if (needprompt) { |
11846 | setprompt(2); |
11847 | } |
11848 | readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, |
11849 | here->eofmark, here->striptabs); |
11850 | n = stzalloc(sizeof(struct narg)); |
11851 | n->narg.type = NARG; |
11852 | /*n->narg.next = NULL; - stzalloc did it */ |
11853 | n->narg.text = wordtext; |
11854 | n->narg.backquote = backquotelist; |
11855 | here->here->nhere.doc = n; |
11856 | here = here->next; |
11857 | } |
11858 | } |
11859 | |
11860 | |
11861 | /* |
11862 | * called by editline -- any expansions to the prompt should be added here. |
11863 | */ |
11864 | #if ENABLE_ASH_EXPAND_PRMT |
11865 | static const char * |
11866 | expandstr(const char *ps) |
11867 | { |
11868 | union node n; |
11869 | |
11870 | /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value, |
11871 | * and token processing _can_ alter it (delete NULs etc). */ |
11872 | setinputstring((char *)ps); |
11873 | readtoken1(pgetc(), PSSYNTAX, nullstr, 0); |
11874 | popfile(); |
11875 | |
11876 | n.narg.type = NARG; |
11877 | n.narg.next = NULL; |
11878 | n.narg.text = wordtext; |
11879 | n.narg.backquote = backquotelist; |
11880 | |
11881 | expandarg(&n, NULL, 0); |
11882 | return stackblock(); |
11883 | } |
11884 | #endif |
11885 | |
11886 | /* |
11887 | * Execute a command or commands contained in a string. |
11888 | */ |
11889 | static int |
11890 | evalstring(char *s, int mask) |
11891 | { |
11892 | union node *n; |
11893 | struct stackmark smark; |
11894 | int skip; |
11895 | |
11896 | setinputstring(s); |
11897 | setstackmark(&smark); |
11898 | |
11899 | skip = 0; |
11900 | while ((n = parsecmd(0)) != NODE_EOF) { |
11901 | evaltree(n, 0); |
11902 | popstackmark(&smark); |
11903 | skip = evalskip; |
11904 | if (skip) |
11905 | break; |
11906 | } |
11907 | popfile(); |
11908 | |
11909 | skip &= mask; |
11910 | evalskip = skip; |
11911 | return skip; |
11912 | } |
11913 | |
11914 | /* |
11915 | * The eval command. |
11916 | */ |
11917 | static int FAST_FUNC |
11918 | evalcmd(int argc UNUSED_PARAM, char **argv) |
11919 | { |
11920 | char *p; |
11921 | char *concat; |
11922 | |
11923 | if (argv[1]) { |
11924 | p = argv[1]; |
11925 | argv += 2; |
11926 | if (argv[0]) { |
11927 | STARTSTACKSTR(concat); |
11928 | for (;;) { |
11929 | concat = stack_putstr(p, concat); |
11930 | p = *argv++; |
11931 | if (p == NULL) |
11932 | break; |
11933 | STPUTC(' ', concat); |
11934 | } |
11935 | STPUTC('\0', concat); |
11936 | p = grabstackstr(concat); |
11937 | } |
11938 | evalstring(p, ~SKIPEVAL); |
11939 | |
11940 | } |
11941 | return exitstatus; |
11942 | } |
11943 | |
11944 | /* |
11945 | * Read and execute commands. |
11946 | * "Top" is nonzero for the top level command loop; |
11947 | * it turns on prompting if the shell is interactive. |
11948 | */ |
11949 | static int |
11950 | cmdloop(int top) |
11951 | { |
11952 | union node *n; |
11953 | struct stackmark smark; |
11954 | int inter; |
11955 | int numeof = 0; |
11956 | |
11957 | TRACE(("cmdloop(%d) called\n", top)); |
11958 | for (;;) { |
11959 | int skip; |
11960 | |
11961 | setstackmark(&smark); |
11962 | #if JOBS |
11963 | if (doing_jobctl) |
11964 | showjobs(stderr, SHOW_CHANGED); |
11965 | #endif |
11966 | inter = 0; |
11967 | if (iflag && top) { |
11968 | inter++; |
11969 | #if ENABLE_ASH_MAIL |
11970 | chkmail(); |
11971 | #endif |
11972 | } |
11973 | n = parsecmd(inter); |
11974 | #if DEBUG |
11975 | if (DEBUG > 2 && debug && (n != NODE_EOF)) |
11976 | showtree(n); |
11977 | #endif |
11978 | if (n == NODE_EOF) { |
11979 | if (!top || numeof >= 50) |
11980 | break; |
11981 | if (!stoppedjobs()) { |
11982 | if (!Iflag) |
11983 | break; |
11984 | out2str("\nUse \"exit\" to leave shell.\n"); |
11985 | } |
11986 | numeof++; |
11987 | } else if (nflag == 0) { |
11988 | /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */ |
11989 | job_warning >>= 1; |
11990 | numeof = 0; |
11991 | evaltree(n, 0); |
11992 | } |
11993 | popstackmark(&smark); |
11994 | skip = evalskip; |
11995 | |
11996 | if (skip) { |
11997 | evalskip = 0; |
11998 | return skip & SKIPEVAL; |
11999 | } |
12000 | } |
12001 | return 0; |
12002 | } |
12003 | |
12004 | /* |
12005 | * Take commands from a file. To be compatible we should do a path |
12006 | * search for the file, which is necessary to find sub-commands. |
12007 | */ |
12008 | static char * |
12009 | find_dot_file(char *name) |
12010 | { |
12011 | char *fullname; |
12012 | const char *path = pathval(); |
12013 | struct stat statb; |
12014 | |
12015 | /* don't try this for absolute or relative paths */ |
12016 | if (strchr(name, '/')) |
12017 | return name; |
12018 | |
12019 | /* IIRC standards do not say whether . is to be searched. |
12020 | * And it is even smaller this way, making it unconditional for now: |
12021 | */ |
12022 | if (1) { /* ENABLE_ASH_BASH_COMPAT */ |
12023 | fullname = name; |
12024 | goto try_cur_dir; |
12025 | } |
12026 | |
12027 | while ((fullname = path_advance(&path, name)) != NULL) { |
12028 | try_cur_dir: |
12029 | if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) { |
12030 | /* |
12031 | * Don't bother freeing here, since it will |
12032 | * be freed by the caller. |
12033 | */ |
12034 | return fullname; |
12035 | } |
12036 | if (fullname != name) |
12037 | stunalloc(fullname); |
12038 | } |
12039 | |
12040 | /* not found in the PATH */ |
12041 | ash_msg_and_raise_error("%s: not found", name); |
12042 | /* NOTREACHED */ |
12043 | } |
12044 | |
12045 | static int FAST_FUNC |
12046 | dotcmd(int argc, char **argv) |
12047 | { |
12048 | char *fullname; |
12049 | struct strlist *sp; |
12050 | volatile struct shparam saveparam; |
12051 | |
12052 | for (sp = cmdenviron; sp; sp = sp->next) |
12053 | setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED); |
12054 | |
12055 | if (!argv[1]) { |
12056 | /* bash says: "bash: .: filename argument required" */ |
12057 | return 2; /* bash compat */ |
12058 | } |
12059 | |
12060 | /* "false; . empty_file; echo $?" should print 0, not 1: */ |
12061 | exitstatus = 0; |
12062 | |
12063 | fullname = find_dot_file(argv[1]); |
12064 | |
12065 | argv += 2; |
12066 | argc -= 2; |
12067 | if (argc) { /* argc > 0, argv[0] != NULL */ |
12068 | saveparam = shellparam; |
12069 | shellparam.malloced = 0; |
12070 | shellparam.nparam = argc; |
12071 | shellparam.p = argv; |
12072 | }; |
12073 | |
12074 | setinputfile(fullname, INPUT_PUSH_FILE); |
12075 | commandname = fullname; |
12076 | cmdloop(0); |
12077 | popfile(); |
12078 | |
12079 | if (argc) { |
12080 | freeparam(&shellparam); |
12081 | shellparam = saveparam; |
12082 | }; |
12083 | |
12084 | return exitstatus; |
12085 | } |
12086 | |
12087 | static int FAST_FUNC |
12088 | exitcmd(int argc UNUSED_PARAM, char **argv) |
12089 | { |
12090 | if (stoppedjobs()) |
12091 | return 0; |
12092 | if (argv[1]) |
12093 | exitstatus = number(argv[1]); |
12094 | raise_exception(EXEXIT); |
12095 | /* NOTREACHED */ |
12096 | } |
12097 | |
12098 | /* |
12099 | * Read a file containing shell functions. |
12100 | */ |
12101 | static void |
12102 | readcmdfile(char *name) |
12103 | { |
12104 | setinputfile(name, INPUT_PUSH_FILE); |
12105 | cmdloop(0); |
12106 | popfile(); |
12107 | } |
12108 | |
12109 | |
12110 | /* ============ find_command inplementation */ |
12111 | |
12112 | /* |
12113 | * Resolve a command name. If you change this routine, you may have to |
12114 | * change the shellexec routine as well. |
12115 | */ |
12116 | static void |
12117 | find_command(char *name, struct cmdentry *entry, int act, const char *path) |
12118 | { |
12119 | struct tblentry *cmdp; |
12120 | int idx; |
12121 | int prev; |
12122 | char *fullname; |
12123 | struct stat statb; |
12124 | int e; |
12125 | int updatetbl; |
12126 | struct builtincmd *bcmd; |
12127 | |
12128 | /* If name contains a slash, don't use PATH or hash table */ |
12129 | if (strchr(name, '/') != NULL) { |
12130 | entry->u.index = -1; |
12131 | if (act & DO_ABS) { |
12132 | while (stat(name, &statb) < 0) { |
12133 | #ifdef SYSV |
12134 | if (errno == EINTR) |
12135 | continue; |
12136 | #endif |
12137 | entry->cmdtype = CMDUNKNOWN; |
12138 | return; |
12139 | } |
12140 | } |
12141 | entry->cmdtype = CMDNORMAL; |
12142 | return; |
12143 | } |
12144 | |
12145 | /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */ |
12146 | |
12147 | updatetbl = (path == pathval()); |
12148 | if (!updatetbl) { |
12149 | act |= DO_ALTPATH; |
12150 | if (strstr(path, "%builtin") != NULL) |
12151 | act |= DO_ALTBLTIN; |
12152 | } |
12153 | |
12154 | /* If name is in the table, check answer will be ok */ |
12155 | cmdp = cmdlookup(name, 0); |
12156 | if (cmdp != NULL) { |
12157 | int bit; |
12158 | |
12159 | switch (cmdp->cmdtype) { |
12160 | default: |
12161 | #if DEBUG |
12162 | abort(); |
12163 | #endif |
12164 | case CMDNORMAL: |
12165 | bit = DO_ALTPATH; |
12166 | break; |
12167 | case CMDFUNCTION: |
12168 | bit = DO_NOFUNC; |
12169 | break; |
12170 | case CMDBUILTIN: |
12171 | bit = DO_ALTBLTIN; |
12172 | break; |
12173 | } |
12174 | if (act & bit) { |
12175 | updatetbl = 0; |
12176 | cmdp = NULL; |
12177 | } else if (cmdp->rehash == 0) |
12178 | /* if not invalidated by cd, we're done */ |
12179 | goto success; |
12180 | } |
12181 | |
12182 | /* If %builtin not in path, check for builtin next */ |
12183 | bcmd = find_builtin(name); |
12184 | if (bcmd) { |
12185 | if (IS_BUILTIN_REGULAR(bcmd)) |
12186 | goto builtin_success; |
12187 | if (act & DO_ALTPATH) { |
12188 | if (!(act & DO_ALTBLTIN)) |
12189 | goto builtin_success; |
12190 | } else if (builtinloc <= 0) { |
12191 | goto builtin_success; |
12192 | } |
12193 | } |
12194 | |
12195 | #if ENABLE_FEATURE_SH_STANDALONE |
12196 | { |
12197 | int applet_no = find_applet_by_name(name); |
12198 | if (applet_no >= 0) { |
12199 | entry->cmdtype = CMDNORMAL; |
12200 | entry->u.index = -2 - applet_no; |
12201 | return; |
12202 | } |
12203 | } |
12204 | #endif |
12205 | |
12206 | /* We have to search path. */ |
12207 | prev = -1; /* where to start */ |
12208 | if (cmdp && cmdp->rehash) { /* doing a rehash */ |
12209 | if (cmdp->cmdtype == CMDBUILTIN) |
12210 | prev = builtinloc; |
12211 | else |
12212 | prev = cmdp->param.index; |
12213 | } |
12214 | |
12215 | e = ENOENT; |
12216 | idx = -1; |
12217 | loop: |
12218 | while ((fullname = path_advance(&path, name)) != NULL) { |
12219 | stunalloc(fullname); |
12220 | /* NB: code below will still use fullname |
12221 | * despite it being "unallocated" */ |
12222 | idx++; |
12223 | if (pathopt) { |
12224 | if (prefix(pathopt, "builtin")) { |
12225 | if (bcmd) |
12226 | goto builtin_success; |
12227 | continue; |
12228 | } |
12229 | if ((act & DO_NOFUNC) |
12230 | || !prefix(pathopt, "func") |
12231 | ) { /* ignore unimplemented options */ |
12232 | continue; |
12233 | } |
12234 | } |
12235 | /* if rehash, don't redo absolute path names */ |
12236 | if (fullname[0] == '/' && idx <= prev) { |
12237 | if (idx < prev) |
12238 | continue; |
12239 | TRACE(("searchexec \"%s\": no change\n", name)); |
12240 | goto success; |
12241 | } |
12242 | while (stat(fullname, &statb) < 0) { |
12243 | #ifdef SYSV |
12244 | if (errno == EINTR) |
12245 | continue; |
12246 | #endif |
12247 | if (errno != ENOENT && errno != ENOTDIR) |
12248 | e = errno; |
12249 | goto loop; |
12250 | } |
12251 | e = EACCES; /* if we fail, this will be the error */ |
12252 | if (!S_ISREG(statb.st_mode)) |
12253 | continue; |
12254 | if (pathopt) { /* this is a %func directory */ |
12255 | stalloc(strlen(fullname) + 1); |
12256 | /* NB: stalloc will return space pointed by fullname |
12257 | * (because we don't have any intervening allocations |
12258 | * between stunalloc above and this stalloc) */ |
12259 | readcmdfile(fullname); |
12260 | cmdp = cmdlookup(name, 0); |
12261 | if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION) |
12262 | ash_msg_and_raise_error("%s not defined in %s", name, fullname); |
12263 | stunalloc(fullname); |
12264 | goto success; |
12265 | } |
12266 | TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname)); |
12267 | if (!updatetbl) { |
12268 | entry->cmdtype = CMDNORMAL; |
12269 | entry->u.index = idx; |
12270 | return; |
12271 | } |
12272 | INT_OFF; |
12273 | cmdp = cmdlookup(name, 1); |
12274 | cmdp->cmdtype = CMDNORMAL; |
12275 | cmdp->param.index = idx; |
12276 | INT_ON; |
12277 | goto success; |
12278 | } |
12279 | |
12280 | /* We failed. If there was an entry for this command, delete it */ |
12281 | if (cmdp && updatetbl) |
12282 | delete_cmd_entry(); |
12283 | if (act & DO_ERR) |
12284 | ash_msg("%s: %s", name, errmsg(e, "not found")); |
12285 | entry->cmdtype = CMDUNKNOWN; |
12286 | return; |
12287 | |
12288 | builtin_success: |
12289 | if (!updatetbl) { |
12290 | entry->cmdtype = CMDBUILTIN; |
12291 | entry->u.cmd = bcmd; |
12292 | return; |
12293 | } |
12294 | INT_OFF; |
12295 | cmdp = cmdlookup(name, 1); |
12296 | cmdp->cmdtype = CMDBUILTIN; |
12297 | cmdp->param.cmd = bcmd; |
12298 | INT_ON; |
12299 | success: |
12300 | cmdp->rehash = 0; |
12301 | entry->cmdtype = cmdp->cmdtype; |
12302 | entry->u = cmdp->param; |
12303 | } |
12304 | |
12305 | |
12306 | /* ============ trap.c */ |
12307 | |
12308 | /* |
12309 | * The trap builtin. |
12310 | */ |
12311 | static int FAST_FUNC |
12312 | trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
12313 | { |
12314 | char *action; |
12315 | char **ap; |
12316 | int signo, exitcode; |
12317 | |
12318 | nextopt(nullstr); |
12319 | ap = argptr; |
12320 | if (!*ap) { |
12321 | for (signo = 0; signo < NSIG; signo++) { |
12322 | char *tr = trap_ptr[signo]; |
12323 | if (tr) { |
12324 | /* note: bash adds "SIG", but only if invoked |
12325 | * as "bash". If called as "sh", or if set -o posix, |
12326 | * then it prints short signal names. |
12327 | * We are printing short names: */ |
12328 | out1fmt("trap -- %s %s\n", |
12329 | single_quote(tr), |
12330 | get_signame(signo)); |
12331 | /* trap_ptr != trap only if we are in special-cased `trap` code. |
12332 | * In this case, we will exit very soon, no need to free(). */ |
12333 | /* if (trap_ptr != trap && tp[0]) */ |
12334 | /* free(tr); */ |
12335 | } |
12336 | } |
12337 | /* |
12338 | if (trap_ptr != trap) { |
12339 | free(trap_ptr); |
12340 | trap_ptr = trap; |
12341 | } |
12342 | */ |
12343 | return 0; |
12344 | } |
12345 | |
12346 | action = NULL; |
12347 | if (ap[1]) |
12348 | action = *ap++; |
12349 | exitcode = 0; |
12350 | while (*ap) { |
12351 | signo = get_signum(*ap); |
12352 | if (signo < 0) { |
12353 | /* Mimic bash message exactly */ |
12354 | ash_msg("%s: invalid signal specification", *ap); |
12355 | exitcode = 1; |
12356 | goto next; |
12357 | } |
12358 | INT_OFF; |
12359 | if (action) { |
12360 | if (LONE_DASH(action)) |
12361 | action = NULL; |
12362 | else |
12363 | action = ckstrdup(action); |
12364 | } |
12365 | free(trap[signo]); |
12366 | if (action) |
12367 | may_have_traps = 1; |
12368 | trap[signo] = action; |
12369 | if (signo != 0) |
12370 | setsignal(signo); |
12371 | INT_ON; |
12372 | next: |
12373 | ap++; |
12374 | } |
12375 | return exitcode; |
12376 | } |
12377 | |
12378 | |
12379 | /* ============ Builtins */ |
12380 | |
12381 | #if !ENABLE_FEATURE_SH_EXTRA_QUIET |
12382 | /* |
12383 | * Lists available builtins |
12384 | */ |
12385 | static int FAST_FUNC |
12386 | helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
12387 | { |
12388 | unsigned col; |
12389 | unsigned i; |
12390 | |
12391 | out1fmt( |
12392 | "Built-in commands:\n" |
12393 | "------------------\n"); |
12394 | for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) { |
12395 | col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), |
12396 | builtintab[i].name + 1); |
12397 | if (col > 60) { |
12398 | out1fmt("\n"); |
12399 | col = 0; |
12400 | } |
12401 | } |
12402 | #if ENABLE_FEATURE_SH_STANDALONE |
12403 | { |
12404 | const char *a = applet_names; |
12405 | while (*a) { |
12406 | col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a); |
12407 | if (col > 60) { |
12408 | out1fmt("\n"); |
12409 | col = 0; |
12410 | } |
12411 | a += strlen(a) + 1; |
12412 | } |
12413 | } |
12414 | #endif |
12415 | out1fmt("\n\n"); |
12416 | return EXIT_SUCCESS; |
12417 | } |
12418 | #endif /* FEATURE_SH_EXTRA_QUIET */ |
12419 | |
12420 | /* |
12421 | * The export and readonly commands. |
12422 | */ |
12423 | static int FAST_FUNC |
12424 | exportcmd(int argc UNUSED_PARAM, char **argv) |
12425 | { |
12426 | struct var *vp; |
12427 | char *name; |
12428 | const char *p; |
12429 | char **aptr; |
12430 | int flag = argv[0][0] == 'r' ? VREADONLY : VEXPORT; |
12431 | |
12432 | if (nextopt("p") != 'p') { |
12433 | aptr = argptr; |
12434 | name = *aptr; |
12435 | if (name) { |
12436 | do { |
12437 | p = strchr(name, '='); |
12438 | if (p != NULL) { |
12439 | p++; |
12440 | } else { |
12441 | vp = *findvar(hashvar(name), name); |
12442 | if (vp) { |
12443 | vp->flags |= flag; |
12444 | continue; |
12445 | } |
12446 | } |
12447 | setvar(name, p, flag); |
12448 | } while ((name = *++aptr) != NULL); |
12449 | return 0; |
12450 | } |
12451 | } |
12452 | showvars(argv[0], flag, 0); |
12453 | return 0; |
12454 | } |
12455 | |
12456 | /* |
12457 | * Delete a function if it exists. |
12458 | */ |
12459 | static void |
12460 | unsetfunc(const char *name) |
12461 | { |
12462 | struct tblentry *cmdp; |
12463 | |
12464 | cmdp = cmdlookup(name, 0); |
12465 | if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION) |
12466 | delete_cmd_entry(); |
12467 | } |
12468 | |
12469 | /* |
12470 | * The unset builtin command. We unset the function before we unset the |
12471 | * variable to allow a function to be unset when there is a readonly variable |
12472 | * with the same name. |
12473 | */ |
12474 | static int FAST_FUNC |
12475 | unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
12476 | { |
12477 | char **ap; |
12478 | int i; |
12479 | int flag = 0; |
12480 | int ret = 0; |
12481 | |
12482 | while ((i = nextopt("vf")) != 0) { |
12483 | flag = i; |
12484 | } |
12485 | |
12486 | for (ap = argptr; *ap; ap++) { |
12487 | if (flag != 'f') { |
12488 | i = unsetvar(*ap); |
12489 | ret |= i; |
12490 | if (!(i & 2)) |
12491 | continue; |
12492 | } |
12493 | if (flag != 'v') |
12494 | unsetfunc(*ap); |
12495 | } |
12496 | return ret & 1; |
12497 | } |
12498 | |
12499 | static const unsigned char timescmd_str[] ALIGN1 = { |
12500 | ' ', offsetof(struct tms, tms_utime), |
12501 | '\n', offsetof(struct tms, tms_stime), |
12502 | ' ', offsetof(struct tms, tms_cutime), |
12503 | '\n', offsetof(struct tms, tms_cstime), |
12504 | 0 |
12505 | }; |
12506 | static int FAST_FUNC |
12507 | timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
12508 | { |
12509 | unsigned long clk_tck, s, t; |
12510 | const unsigned char *p; |
12511 | struct tms buf; |
12512 | |
12513 | clk_tck = sysconf(_SC_CLK_TCK); |
12514 | times(&buf); |
12515 | |
12516 | p = timescmd_str; |
12517 | do { |
12518 | t = *(clock_t *)(((char *) &buf) + p[1]); |
12519 | s = t / clk_tck; |
12520 | t = t % clk_tck; |
12521 | out1fmt("%lum%lu.%03lus%c", |
12522 | s / 60, s % 60, |
12523 | (t * 1000) / clk_tck, |
12524 | p[0]); |
12525 | p += 2; |
12526 | } while (*p); |
12527 | |
12528 | return 0; |
12529 | } |
12530 | |
12531 | #if ENABLE_SH_MATH_SUPPORT |
12532 | /* |
12533 | * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell. |
12534 | * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc. |
12535 | * |
12536 | * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru> |
12537 | */ |
12538 | static int FAST_FUNC |
12539 | letcmd(int argc UNUSED_PARAM, char **argv) |
12540 | { |
12541 | arith_t i; |
12542 | |
12543 | argv++; |
12544 | if (!*argv) |
12545 | ash_msg_and_raise_error("expression expected"); |
12546 | do { |
12547 | i = ash_arith(*argv); |
12548 | } while (*++argv); |
12549 | |
12550 | return !i; |
12551 | } |
12552 | #endif |
12553 | |
12554 | /* |
12555 | * The read builtin. Options: |
12556 | * -r Do not interpret '\' specially |
12557 | * -s Turn off echo (tty only) |
12558 | * -n NCHARS Read NCHARS max |
12559 | * -p PROMPT Display PROMPT on stderr (if input is from tty) |
12560 | * -t SECONDS Timeout after SECONDS (tty or pipe only) |
12561 | * -u FD Read from given FD instead of fd 0 |
12562 | * This uses unbuffered input, which may be avoidable in some cases. |
12563 | * TODO: bash also has: |
12564 | * -a ARRAY Read into array[0],[1],etc |
12565 | * -d DELIM End on DELIM char, not newline |
12566 | * -e Use line editing (tty only) |
12567 | */ |
12568 | static int FAST_FUNC |
12569 | readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
12570 | { |
12571 | char *opt_n = NULL; |
12572 | char *opt_p = NULL; |
12573 | char *opt_t = NULL; |
12574 | char *opt_u = NULL; |
12575 | int read_flags = 0; |
12576 | const char *r; |
12577 | int i; |
12578 | |
12579 | while ((i = nextopt("p:u:rt:n:s")) != '\0') { |
12580 | switch (i) { |
12581 | case 'p': |
12582 | opt_p = optionarg; |
12583 | break; |
12584 | case 'n': |
12585 | opt_n = optionarg; |
12586 | break; |
12587 | case 's': |
12588 | read_flags |= BUILTIN_READ_SILENT; |
12589 | break; |
12590 | case 't': |
12591 | opt_t = optionarg; |
12592 | break; |
12593 | case 'r': |
12594 | read_flags |= BUILTIN_READ_RAW; |
12595 | break; |
12596 | case 'u': |
12597 | opt_u = optionarg; |
12598 | break; |
12599 | default: |
12600 | break; |
12601 | } |
12602 | } |
12603 | |
12604 | r = shell_builtin_read(setvar2, |
12605 | argptr, |
12606 | bltinlookup("IFS"), /* can be NULL */ |
12607 | read_flags, |
12608 | opt_n, |
12609 | opt_p, |
12610 | opt_t, |
12611 | opt_u |
12612 | ); |
12613 | |
12614 | if ((uintptr_t)r > 1) |
12615 | ash_msg_and_raise_error(r); |
12616 | |
12617 | return (uintptr_t)r; |
12618 | } |
12619 | |
12620 | static int FAST_FUNC |
12621 | umaskcmd(int argc UNUSED_PARAM, char **argv) |
12622 | { |
12623 | static const char permuser[3] ALIGN1 = "ugo"; |
12624 | static const char permmode[3] ALIGN1 = "rwx"; |
12625 | static const short permmask[] ALIGN2 = { |
12626 | S_IRUSR, S_IWUSR, S_IXUSR, |
12627 | S_IRGRP, S_IWGRP, S_IXGRP, |
12628 | S_IROTH, S_IWOTH, S_IXOTH |
12629 | }; |
12630 | |
12631 | /* TODO: use bb_parse_mode() instead */ |
12632 | |
12633 | char *ap; |
12634 | mode_t mask; |
12635 | int i; |
12636 | int symbolic_mode = 0; |
12637 | |
12638 | while (nextopt("S") != '\0') { |
12639 | symbolic_mode = 1; |
12640 | } |
12641 | |
12642 | INT_OFF; |
12643 | mask = umask(0); |
12644 | umask(mask); |
12645 | INT_ON; |
12646 | |
12647 | ap = *argptr; |
12648 | if (ap == NULL) { |
12649 | if (symbolic_mode) { |
12650 | char buf[18]; |
12651 | char *p = buf; |
12652 | |
12653 | for (i = 0; i < 3; i++) { |
12654 | int j; |
12655 | |
12656 | *p++ = permuser[i]; |
12657 | *p++ = '='; |
12658 | for (j = 0; j < 3; j++) { |
12659 | if ((mask & permmask[3 * i + j]) == 0) { |
12660 | *p++ = permmode[j]; |
12661 | } |
12662 | } |
12663 | *p++ = ','; |
12664 | } |
12665 | *--p = 0; |
12666 | puts(buf); |
12667 | } else { |
12668 | out1fmt("%.4o\n", mask); |
12669 | } |
12670 | } else { |
12671 | if (isdigit((unsigned char) *ap)) { |
12672 | mask = 0; |
12673 | do { |
12674 | if (*ap >= '8' || *ap < '0') |
12675 | ash_msg_and_raise_error(msg_illnum, argv[1]); |
12676 | mask = (mask << 3) + (*ap - '0'); |
12677 | } while (*++ap != '\0'); |
12678 | umask(mask); |
12679 | } else { |
12680 | mask = ~mask & 0777; |
12681 | if (!bb_parse_mode(ap, &mask)) { |
12682 | ash_msg_and_raise_error("illegal mode: %s", ap); |
12683 | } |
12684 | umask(~mask & 0777); |
12685 | } |
12686 | } |
12687 | return 0; |
12688 | } |
12689 | |
12690 | static int FAST_FUNC |
12691 | ulimitcmd(int argc UNUSED_PARAM, char **argv) |
12692 | { |
12693 | return shell_builtin_ulimit(argv); |
12694 | } |
12695 | |
12696 | /* ============ main() and helpers */ |
12697 | |
12698 | /* |
12699 | * Called to exit the shell. |
12700 | */ |
12701 | static void exitshell(void) NORETURN; |
12702 | static void |
12703 | exitshell(void) |
12704 | { |
12705 | struct jmploc loc; |
12706 | char *p; |
12707 | int status; |
12708 | |
12709 | status = exitstatus; |
12710 | TRACE(("pid %d, exitshell(%d)\n", getpid(), status)); |
12711 | if (setjmp(loc.loc)) { |
12712 | if (exception_type == EXEXIT) |
12713 | /* dash bug: it just does _exit(exitstatus) here |
12714 | * but we have to do setjobctl(0) first! |
12715 | * (bug is still not fixed in dash-0.5.3 - if you run dash |
12716 | * under Midnight Commander, on exit from dash MC is backgrounded) */ |
12717 | status = exitstatus; |
12718 | goto out; |
12719 | } |
12720 | exception_handler = &loc; |
12721 | p = trap[0]; |
12722 | if (p) { |
12723 | trap[0] = NULL; |
12724 | evalstring(p, 0); |
12725 | free(p); |
12726 | } |
12727 | flush_stdout_stderr(); |
12728 | out: |
12729 | setjobctl(0); |
12730 | _exit(status); |
12731 | /* NOTREACHED */ |
12732 | } |
12733 | |
12734 | static void |
12735 | init(void) |
12736 | { |
12737 | /* from input.c: */ |
12738 | /* we will never free this */ |
12739 | basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ); |
12740 | |
12741 | /* from trap.c: */ |
12742 | signal(SIGCHLD, SIG_DFL); |
12743 | /* bash re-enables SIGHUP which is SIG_IGNed on entry. |
12744 | * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$" |
12745 | */ |
12746 | signal(SIGHUP, SIG_DFL); |
12747 | |
12748 | /* from var.c: */ |
12749 | { |
12750 | char **envp; |
12751 | const char *p; |
12752 | struct stat st1, st2; |
12753 | |
12754 | initvar(); |
12755 | for (envp = environ; envp && *envp; envp++) { |
12756 | if (strchr(*envp, '=')) { |
12757 | setvareq(*envp, VEXPORT|VTEXTFIXED); |
12758 | } |
12759 | } |
12760 | |
12761 | setvar("PPID", utoa(getppid()), 0); |
12762 | |
12763 | p = lookupvar("PWD"); |
12764 | if (p) |
12765 | if (*p != '/' || stat(p, &st1) || stat(".", &st2) |
12766 | || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) |
12767 | p = '\0'; |
12768 | setpwd(p, 0); |
12769 | } |
12770 | } |
12771 | |
12772 | /* |
12773 | * Process the shell command line arguments. |
12774 | */ |
12775 | static void |
12776 | procargs(char **argv) |
12777 | { |
12778 | int i; |
12779 | const char *xminusc; |
12780 | char **xargv; |
12781 | |
12782 | xargv = argv; |
12783 | arg0 = xargv[0]; |
12784 | /* if (xargv[0]) - mmm, this is always true! */ |
12785 | xargv++; |
12786 | for (i = 0; i < NOPTS; i++) |
12787 | optlist[i] = 2; |
12788 | argptr = xargv; |
12789 | if (options(1)) { |
12790 | /* it already printed err message */ |
12791 | raise_exception(EXERROR); |
12792 | } |
12793 | xargv = argptr; |
12794 | xminusc = minusc; |
12795 | if (*xargv == NULL) { |
12796 | if (xminusc) |
12797 | ash_msg_and_raise_error(bb_msg_requires_arg, "-c"); |
12798 | sflag = 1; |
12799 | } |
12800 | if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1)) |
12801 | iflag = 1; |
12802 | if (mflag == 2) |
12803 | mflag = iflag; |
12804 | for (i = 0; i < NOPTS; i++) |
12805 | if (optlist[i] == 2) |
12806 | optlist[i] = 0; |
12807 | #if DEBUG == 2 |
12808 | debug = 1; |
12809 | #endif |
12810 | /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */ |
12811 | if (xminusc) { |
12812 | minusc = *xargv++; |
12813 | if (*xargv) |
12814 | goto setarg0; |
12815 | } else if (!sflag) { |
12816 | setinputfile(*xargv, 0); |
12817 | setarg0: |
12818 | arg0 = *xargv++; |
12819 | commandname = arg0; |
12820 | } |
12821 | |
12822 | shellparam.p = xargv; |
12823 | #if ENABLE_ASH_GETOPTS |
12824 | shellparam.optind = 1; |
12825 | shellparam.optoff = -1; |
12826 | #endif |
12827 | /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */ |
12828 | while (*xargv) { |
12829 | shellparam.nparam++; |
12830 | xargv++; |
12831 | } |
12832 | optschanged(); |
12833 | } |
12834 | |
12835 | /* |
12836 | * Read /etc/profile or .profile. |
12837 | */ |
12838 | static void |
12839 | read_profile(const char *name) |
12840 | { |
12841 | int skip; |
12842 | |
12843 | if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0) |
12844 | return; |
12845 | skip = cmdloop(0); |
12846 | popfile(); |
12847 | if (skip) |
12848 | exitshell(); |
12849 | } |
12850 | |
12851 | /* |
12852 | * This routine is called when an error or an interrupt occurs in an |
12853 | * interactive shell and control is returned to the main command loop. |
12854 | */ |
12855 | static void |
12856 | reset(void) |
12857 | { |
12858 | /* from eval.c: */ |
12859 | evalskip = 0; |
12860 | loopnest = 0; |
12861 | /* from input.c: */ |
12862 | g_parsefile->left_in_buffer = 0; |
12863 | g_parsefile->left_in_line = 0; /* clear input buffer */ |
12864 | popallfiles(); |
12865 | /* from parser.c: */ |
12866 | tokpushback = 0; |
12867 | checkkwd = 0; |
12868 | /* from redir.c: */ |
12869 | clearredir(/*drop:*/ 0); |
12870 | } |
12871 | |
12872 | #if PROFILE |
12873 | static short profile_buf[16384]; |
12874 | extern int etext(); |
12875 | #endif |
12876 | |
12877 | /* |
12878 | * Main routine. We initialize things, parse the arguments, execute |
12879 | * profiles if we're a login shell, and then call cmdloop to execute |
12880 | * commands. The setjmp call sets up the location to jump to when an |
12881 | * exception occurs. When an exception occurs the variable "state" |
12882 | * is used to figure out how far we had gotten. |
12883 | */ |
12884 | int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
12885 | int ash_main(int argc UNUSED_PARAM, char **argv) |
12886 | { |
12887 | const char *shinit; |
12888 | volatile smallint state; |
12889 | struct jmploc jmploc; |
12890 | struct stackmark smark; |
12891 | |
12892 | /* Initialize global data */ |
12893 | INIT_G_misc(); |
12894 | INIT_G_memstack(); |
12895 | INIT_G_var(); |
12896 | #if ENABLE_ASH_ALIAS |
12897 | INIT_G_alias(); |
12898 | #endif |
12899 | INIT_G_cmdtable(); |
12900 | |
12901 | #if PROFILE |
12902 | monitor(4, etext, profile_buf, sizeof(profile_buf), 50); |
12903 | #endif |
12904 | |
12905 | #if ENABLE_FEATURE_EDITING |
12906 | line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP); |
12907 | #endif |
12908 | state = 0; |
12909 | if (setjmp(jmploc.loc)) { |
12910 | smallint e; |
12911 | smallint s; |
12912 | |
12913 | reset(); |
12914 | |
12915 | e = exception_type; |
12916 | if (e == EXERROR) |
12917 | exitstatus = 2; |
12918 | s = state; |
12919 | if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) |
12920 | exitshell(); |
12921 | if (e == EXINT) |
12922 | outcslow('\n', stderr); |
12923 | |
12924 | popstackmark(&smark); |
12925 | FORCE_INT_ON; /* enable interrupts */ |
12926 | if (s == 1) |
12927 | goto state1; |
12928 | if (s == 2) |
12929 | goto state2; |
12930 | if (s == 3) |
12931 | goto state3; |
12932 | goto state4; |
12933 | } |
12934 | exception_handler = &jmploc; |
12935 | #if DEBUG |
12936 | opentrace(); |
12937 | TRACE(("Shell args: ")); |
12938 | trace_puts_args(argv); |
12939 | #endif |
12940 | rootpid = getpid(); |
12941 | |
12942 | init(); |
12943 | setstackmark(&smark); |
12944 | procargs(argv); |
12945 | |
12946 | #if ENABLE_FEATURE_EDITING_SAVEHISTORY |
12947 | if (iflag) { |
12948 | const char *hp = lookupvar("HISTFILE"); |
12949 | |
12950 | if (hp == NULL) { |
12951 | hp = lookupvar("HOME"); |
12952 | if (hp != NULL) { |
12953 | char *defhp = concat_path_file(hp, ".ash_history"); |
12954 | setvar("HISTFILE", defhp, 0); |
12955 | free(defhp); |
12956 | } |
12957 | } |
12958 | } |
12959 | #endif |
12960 | if (/* argv[0] && */ argv[0][0] == '-') |
12961 | isloginsh = 1; |
12962 | if (isloginsh) { |
12963 | state = 1; |
12964 | read_profile("/etc/profile"); |
12965 | state1: |
12966 | state = 2; |
12967 | read_profile(".profile"); |
12968 | } |
12969 | state2: |
12970 | state = 3; |
12971 | if ( |
12972 | #ifndef linux |
12973 | getuid() == geteuid() && getgid() == getegid() && |
12974 | #endif |
12975 | iflag |
12976 | ) { |
12977 | shinit = lookupvar("ENV"); |
12978 | if (shinit != NULL && *shinit != '\0') { |
12979 | read_profile(shinit); |
12980 | } |
12981 | } |
12982 | state3: |
12983 | state = 4; |
12984 | if (minusc) { |
12985 | /* evalstring pushes parsefile stack. |
12986 | * Ensure we don't falsely claim that 0 (stdin) |
12987 | * is one of stacked source fds. |
12988 | * Testcase: ash -c 'exec 1>&0' must not complain. */ |
12989 | // if (!sflag) g_parsefile->pf_fd = -1; |
12990 | // ^^ not necessary since now we special-case fd 0 |
12991 | // in is_hidden_fd() to not be considered "hidden fd" |
12992 | evalstring(minusc, 0); |
12993 | } |
12994 | |
12995 | if (sflag || minusc == NULL) { |
12996 | #if defined MAX_HISTORY && MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY |
12997 | if (iflag) { |
12998 | const char *hp = lookupvar("HISTFILE"); |
12999 | if (hp) |
13000 | line_input_state->hist_file = hp; |
13001 | } |
13002 | #endif |
13003 | state4: /* XXX ??? - why isn't this before the "if" statement */ |
13004 | cmdloop(1); |
13005 | } |
13006 | #if PROFILE |
13007 | monitor(0); |
13008 | #endif |
13009 | #ifdef GPROF |
13010 | { |
13011 | extern void _mcleanup(void); |
13012 | _mcleanup(); |
13013 | } |
13014 | #endif |
13015 | exitshell(); |
13016 | /* NOTREACHED */ |
13017 | } |
13018 | |
13019 | |
13020 | /*- |
13021 | * Copyright (c) 1989, 1991, 1993, 1994 |
13022 | * The Regents of the University of California. All rights reserved. |
13023 | * |
13024 | * This code is derived from software contributed to Berkeley by |
13025 | * Kenneth Almquist. |
13026 | * |
13027 | * Redistribution and use in source and binary forms, with or without |
13028 | * modification, are permitted provided that the following conditions |
13029 | * are met: |
13030 | * 1. Redistributions of source code must retain the above copyright |
13031 | * notice, this list of conditions and the following disclaimer. |
13032 | * 2. Redistributions in binary form must reproduce the above copyright |
13033 | * notice, this list of conditions and the following disclaimer in the |
13034 | * documentation and/or other materials provided with the distribution. |
13035 | * 3. Neither the name of the University nor the names of its contributors |
13036 | * may be used to endorse or promote products derived from this software |
13037 | * without specific prior written permission. |
13038 | * |
13039 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
13040 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
13041 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
13042 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
13043 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
13044 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
13045 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
13046 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
13047 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
13048 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
13049 | * SUCH DAMAGE. |
13050 | */ |