Contents of /tags/mkinitrd-6_1_9/busybox/shell/msh.c
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Wed Oct 28 00:26:51 2009 UTC (14 years, 11 months ago) by niro
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Wed Oct 28 00:26:51 2009 UTC (14 years, 11 months ago) by niro
File MIME type: text/plain
File size: 104947 byte(s)
tagged 'mkinitrd-6_1_9'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Minix shell port for busybox |
4 | * |
5 | * This version of the Minix shell was adapted for use in busybox |
6 | * by Erik Andersen <andersen@codepoet.org> |
7 | * |
8 | * - backtick expansion did not work properly |
9 | * Jonas Holmberg <jonas.holmberg@axis.com> |
10 | * Robert Schwebel <r.schwebel@pengutronix.de> |
11 | * Erik Andersen <andersen@codepoet.org> |
12 | * |
13 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
14 | */ |
15 | |
16 | #include <sys/times.h> |
17 | #include <setjmp.h> |
18 | |
19 | #ifdef STANDALONE |
20 | # ifndef _GNU_SOURCE |
21 | # define _GNU_SOURCE |
22 | # endif |
23 | # include <sys/types.h> |
24 | # include <sys/stat.h> |
25 | # include <sys/wait.h> |
26 | # include <signal.h> |
27 | # include <stdio.h> |
28 | # include <stdlib.h> |
29 | # include <unistd.h> |
30 | # include <string.h> |
31 | # include <errno.h> |
32 | # include <dirent.h> |
33 | # include <fcntl.h> |
34 | # include <ctype.h> |
35 | # include <assert.h> |
36 | # define bb_dev_null "/dev/null" |
37 | # define DEFAULT_SHELL "/proc/self/exe" |
38 | # define CONFIG_BUSYBOX_EXEC_PATH "/proc/self/exe" |
39 | # define bb_banner "busybox standalone" |
40 | # define ENABLE_FEATURE_SH_STANDALONE 0 |
41 | # define bb_msg_memory_exhausted "memory exhausted" |
42 | # define xmalloc(size) malloc(size) |
43 | # define msh_main(argc,argv) main(argc,argv) |
44 | # define safe_read(fd,buf,count) read(fd,buf,count) |
45 | # define nonblock_safe_read(fd,buf,count) read(fd,buf,count) |
46 | # define NOT_LONE_DASH(s) ((s)[0] != '-' || (s)[1]) |
47 | # define LONE_CHAR(s,c) ((s)[0] == (c) && !(s)[1]) |
48 | # define NORETURN __attribute__ ((__noreturn__)) |
49 | static int find_applet_by_name(const char *applet) |
50 | { |
51 | return -1; |
52 | } |
53 | static char *utoa_to_buf(unsigned n, char *buf, unsigned buflen) |
54 | { |
55 | unsigned i, out, res; |
56 | assert(sizeof(unsigned) == 4); |
57 | if (buflen) { |
58 | out = 0; |
59 | for (i = 1000000000; i; i /= 10) { |
60 | res = n / i; |
61 | if (res || out || i == 1) { |
62 | if (!--buflen) break; |
63 | out++; |
64 | n -= res*i; |
65 | *buf++ = '0' + res; |
66 | } |
67 | } |
68 | } |
69 | return buf; |
70 | } |
71 | static char *itoa_to_buf(int n, char *buf, unsigned buflen) |
72 | { |
73 | if (buflen && n < 0) { |
74 | n = -n; |
75 | *buf++ = '-'; |
76 | buflen--; |
77 | } |
78 | return utoa_to_buf((unsigned)n, buf, buflen); |
79 | } |
80 | static char local_buf[12]; |
81 | static char *itoa(int n) |
82 | { |
83 | *(itoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0'; |
84 | return local_buf; |
85 | } |
86 | #else |
87 | # include "busybox.h" /* for applet_names */ |
88 | #endif |
89 | |
90 | //#define MSHDEBUG 4 |
91 | |
92 | #ifdef MSHDEBUG |
93 | static int mshdbg = MSHDEBUG; |
94 | |
95 | #define DBGPRINTF(x) if (mshdbg > 0) printf x |
96 | #define DBGPRINTF0(x) if (mshdbg > 0) printf x |
97 | #define DBGPRINTF1(x) if (mshdbg > 1) printf x |
98 | #define DBGPRINTF2(x) if (mshdbg > 2) printf x |
99 | #define DBGPRINTF3(x) if (mshdbg > 3) printf x |
100 | #define DBGPRINTF4(x) if (mshdbg > 4) printf x |
101 | #define DBGPRINTF5(x) if (mshdbg > 5) printf x |
102 | #define DBGPRINTF6(x) if (mshdbg > 6) printf x |
103 | #define DBGPRINTF7(x) if (mshdbg > 7) printf x |
104 | #define DBGPRINTF8(x) if (mshdbg > 8) printf x |
105 | #define DBGPRINTF9(x) if (mshdbg > 9) printf x |
106 | |
107 | static int mshdbg_rc = 0; |
108 | |
109 | #define RCPRINTF(x) if (mshdbg_rc) printf x |
110 | |
111 | #else |
112 | |
113 | #define DBGPRINTF(x) |
114 | #define DBGPRINTF0(x) ((void)0) |
115 | #define DBGPRINTF1(x) ((void)0) |
116 | #define DBGPRINTF2(x) ((void)0) |
117 | #define DBGPRINTF3(x) ((void)0) |
118 | #define DBGPRINTF4(x) ((void)0) |
119 | #define DBGPRINTF5(x) ((void)0) |
120 | #define DBGPRINTF6(x) ((void)0) |
121 | #define DBGPRINTF7(x) ((void)0) |
122 | #define DBGPRINTF8(x) ((void)0) |
123 | #define DBGPRINTF9(x) ((void)0) |
124 | |
125 | #define RCPRINTF(x) ((void)0) |
126 | |
127 | #endif /* MSHDEBUG */ |
128 | |
129 | |
130 | #if ENABLE_FEATURE_EDITING_FANCY_PROMPT |
131 | # define DEFAULT_ROOT_PROMPT "\\u:\\w> " |
132 | # define DEFAULT_USER_PROMPT "\\u:\\w$ " |
133 | #else |
134 | # define DEFAULT_ROOT_PROMPT "# " |
135 | # define DEFAULT_USER_PROMPT "$ " |
136 | #endif |
137 | |
138 | |
139 | /* -------- sh.h -------- */ |
140 | /* |
141 | * shell |
142 | */ |
143 | |
144 | #define LINELIM 2100 |
145 | #define NPUSH 8 /* limit to input nesting */ |
146 | |
147 | #undef NOFILE |
148 | #define NOFILE 20 /* Number of open files */ |
149 | #define NUFILE 10 /* Number of user-accessible files */ |
150 | #define FDBASE 10 /* First file usable by Shell */ |
151 | |
152 | /* |
153 | * values returned by wait |
154 | */ |
155 | #define WAITSIG(s) ((s) & 0177) |
156 | #define WAITVAL(s) (((s) >> 8) & 0377) |
157 | #define WAITCORE(s) (((s) & 0200) != 0) |
158 | |
159 | /* |
160 | * library and system definitions |
161 | */ |
162 | typedef void xint; /* base type of jmp_buf, for not broken compilers */ |
163 | |
164 | /* |
165 | * shell components |
166 | */ |
167 | #define NOBLOCK ((struct op *)NULL) |
168 | #define NOWORD ((char *)NULL) |
169 | #define NOWORDS ((char **)NULL) |
170 | #define NOPIPE ((int *)NULL) |
171 | |
172 | /* |
173 | * redirection |
174 | */ |
175 | struct ioword { |
176 | smallint io_flag; /* action (below) */ |
177 | int io_fd; /* fd affected */ |
178 | char *io_name; /* file name */ |
179 | }; |
180 | |
181 | #define IOREAD 1 /* < */ |
182 | #define IOHERE 2 /* << (here file) */ |
183 | #define IOWRITE 4 /* > */ |
184 | #define IOCAT 8 /* >> */ |
185 | #define IOXHERE 16 /* ${}, ` in << */ |
186 | #define IODUP 32 /* >&digit */ |
187 | #define IOCLOSE 64 /* >&- */ |
188 | |
189 | #define IODEFAULT (-1) /* "default" IO fd */ |
190 | |
191 | |
192 | /* |
193 | * Description of a command or an operation on commands. |
194 | * Might eventually use a union. |
195 | */ |
196 | struct op { |
197 | smallint op_type; /* operation type, see Txxxx below */ |
198 | char **op_words; /* arguments to a command */ |
199 | struct ioword **ioact; /* IO actions (eg, < > >>) */ |
200 | struct op *left; |
201 | struct op *right; |
202 | char *str; /* identifier for case and for */ |
203 | }; |
204 | |
205 | #define TCOM 1 /* command */ |
206 | #define TPAREN 2 /* (c-list) */ |
207 | #define TPIPE 3 /* a | b */ |
208 | #define TLIST 4 /* a [&;] b */ |
209 | #define TOR 5 /* || */ |
210 | #define TAND 6 /* && */ |
211 | #define TFOR 7 |
212 | #define TDO 8 |
213 | #define TCASE 9 |
214 | #define TIF 10 |
215 | #define TWHILE 11 |
216 | #define TUNTIL 12 |
217 | #define TELIF 13 |
218 | #define TPAT 14 /* pattern in case */ |
219 | #define TBRACE 15 /* {c-list} */ |
220 | #define TASYNC 16 /* c & */ |
221 | /* Added to support "." file expansion */ |
222 | #define TDOT 17 |
223 | |
224 | /* Strings for names to make debug easier */ |
225 | #ifdef MSHDEBUG |
226 | static const char *const T_CMD_NAMES[] = { |
227 | "PLACEHOLDER", |
228 | "TCOM", |
229 | "TPAREN", |
230 | "TPIPE", |
231 | "TLIST", |
232 | "TOR", |
233 | "TAND", |
234 | "TFOR", |
235 | "TDO", |
236 | "TCASE", |
237 | "TIF", |
238 | "TWHILE", |
239 | "TUNTIL", |
240 | "TELIF", |
241 | "TPAT", |
242 | "TBRACE", |
243 | "TASYNC", |
244 | "TDOT", |
245 | }; |
246 | #endif |
247 | |
248 | #define AREASIZE (90000) |
249 | |
250 | /* |
251 | * flags to control evaluation of words |
252 | */ |
253 | #define DOSUB 1 /* interpret $, `, and quotes */ |
254 | #define DOBLANK 2 /* perform blank interpretation */ |
255 | #define DOGLOB 4 /* interpret [?* */ |
256 | #define DOKEY 8 /* move words with `=' to 2nd arg. list */ |
257 | #define DOTRIM 16 /* trim resulting string */ |
258 | |
259 | #define DOALL (DOSUB|DOBLANK|DOGLOB|DOKEY|DOTRIM) |
260 | |
261 | |
262 | struct brkcon { |
263 | jmp_buf brkpt; |
264 | struct brkcon *nextlev; |
265 | }; |
266 | |
267 | |
268 | static smallint trapset; /* trap pending (signal number) */ |
269 | |
270 | static smallint yynerrs; /* yacc (flag) */ |
271 | |
272 | /* moved to G: static char line[LINELIM]; */ |
273 | |
274 | #if ENABLE_FEATURE_EDITING |
275 | static char *current_prompt; |
276 | static line_input_t *line_input_state; |
277 | #endif |
278 | |
279 | |
280 | /* |
281 | * other functions |
282 | */ |
283 | static const char *rexecve(char *c, char **v, char **envp); |
284 | static char *evalstr(char *cp, int f); |
285 | static char *putn(int n); |
286 | static char *unquote(char *as); |
287 | static int rlookup(char *n); |
288 | static struct wdblock *glob(char *cp, struct wdblock *wb); |
289 | static int my_getc(int ec); |
290 | static int subgetc(char ec, int quoted); |
291 | static char **makenv(int all, struct wdblock *wb); |
292 | static char **eval(char **ap, int f); |
293 | static int setstatus(int s); |
294 | static int waitfor(int lastpid, int canintr); |
295 | |
296 | static void onintr(int s); /* SIGINT handler */ |
297 | |
298 | static int newenv(int f); |
299 | static void quitenv(void); |
300 | static void next(int f); |
301 | static void setdash(void); |
302 | static void onecommand(void); |
303 | static void runtrap(int i); |
304 | |
305 | |
306 | /* -------- area stuff -------- */ |
307 | |
308 | #define REGSIZE sizeof(struct region) |
309 | #define GROWBY (256) |
310 | /* #define SHRINKBY (64) */ |
311 | #undef SHRINKBY |
312 | #define FREE (32767) |
313 | #define BUSY (0) |
314 | #define ALIGN (sizeof(int)-1) |
315 | |
316 | |
317 | struct region { |
318 | struct region *next; |
319 | int area; |
320 | }; |
321 | |
322 | |
323 | /* -------- grammar stuff -------- */ |
324 | typedef union { |
325 | char *cp; |
326 | char **wp; |
327 | int i; |
328 | struct op *o; |
329 | } YYSTYPE; |
330 | |
331 | #define WORD 256 |
332 | #define LOGAND 257 |
333 | #define LOGOR 258 |
334 | #define BREAK 259 |
335 | #define IF 260 |
336 | #define THEN 261 |
337 | #define ELSE 262 |
338 | #define ELIF 263 |
339 | #define FI 264 |
340 | #define CASE 265 |
341 | #define ESAC 266 |
342 | #define FOR 267 |
343 | #define WHILE 268 |
344 | #define UNTIL 269 |
345 | #define DO 270 |
346 | #define DONE 271 |
347 | #define IN 272 |
348 | /* Added for "." file expansion */ |
349 | #define DOT 273 |
350 | |
351 | #define YYERRCODE 300 |
352 | |
353 | /* flags to yylex */ |
354 | #define CONTIN 01 /* skip new lines to complete command */ |
355 | |
356 | static struct op *pipeline(int cf); |
357 | static struct op *andor(void); |
358 | static struct op *c_list(void); |
359 | static int synio(int cf); |
360 | static void musthave(int c, int cf); |
361 | static struct op *simple(void); |
362 | static struct op *nested(int type, int mark); |
363 | static struct op *command(int cf); |
364 | static struct op *dogroup(int onlydone); |
365 | static struct op *thenpart(void); |
366 | static struct op *elsepart(void); |
367 | static struct op *caselist(void); |
368 | static struct op *casepart(void); |
369 | static char **pattern(void); |
370 | static char **wordlist(void); |
371 | static struct op *list(struct op *t1, struct op *t2); |
372 | static struct op *block(int type, struct op *t1, struct op *t2, char **wp); |
373 | static struct op *newtp(void); |
374 | static struct op *namelist(struct op *t); |
375 | static char **copyw(void); |
376 | static void word(char *cp); |
377 | static struct ioword **copyio(void); |
378 | static struct ioword *io(int u, int f, char *cp); |
379 | static int yylex(int cf); |
380 | static int collect(int c, int c1); |
381 | static int dual(int c); |
382 | static void diag(int ec); |
383 | static char *tree(unsigned size); |
384 | |
385 | /* -------- var.h -------- */ |
386 | |
387 | struct var { |
388 | char *value; |
389 | char *name; |
390 | struct var *next; |
391 | char status; |
392 | }; |
393 | |
394 | #define COPYV 1 /* flag to setval, suggesting copy */ |
395 | #define RONLY 01 /* variable is read-only */ |
396 | #define EXPORT 02 /* variable is to be exported */ |
397 | #define GETCELL 04 /* name & value space was got with getcell */ |
398 | |
399 | static int yyparse(void); |
400 | |
401 | |
402 | /* -------- io.h -------- */ |
403 | /* io buffer */ |
404 | struct iobuf { |
405 | unsigned id; /* buffer id */ |
406 | char buf[512]; /* buffer */ |
407 | char *bufp; /* pointer into buffer */ |
408 | char *ebufp; /* pointer to end of buffer */ |
409 | }; |
410 | |
411 | /* possible arguments to an IO function */ |
412 | struct ioarg { |
413 | const char *aword; |
414 | char **awordlist; |
415 | int afile; /* file descriptor */ |
416 | unsigned afid; /* buffer id */ |
417 | off_t afpos; /* file position */ |
418 | struct iobuf *afbuf; /* buffer for this file */ |
419 | }; |
420 | |
421 | /* an input generator's state */ |
422 | struct io { |
423 | int (*iofn) (struct ioarg *, struct io *); |
424 | struct ioarg *argp; |
425 | int peekc; |
426 | char prev; /* previous character read by readc() */ |
427 | char nlcount; /* for `'s */ |
428 | char xchar; /* for `'s */ |
429 | char task; /* reason for pushed IO */ |
430 | }; |
431 | /* ->task: */ |
432 | #define XOTHER 0 /* none of the below */ |
433 | #define XDOLL 1 /* expanding ${} */ |
434 | #define XGRAVE 2 /* expanding `'s */ |
435 | #define XIO 3 /* file IO */ |
436 | |
437 | |
438 | /* |
439 | * input generators for IO structure |
440 | */ |
441 | static int nlchar(struct ioarg *ap); |
442 | static int strchar(struct ioarg *ap); |
443 | static int qstrchar(struct ioarg *ap); |
444 | static int filechar(struct ioarg *ap); |
445 | static int herechar(struct ioarg *ap); |
446 | static int linechar(struct ioarg *ap); |
447 | static int gravechar(struct ioarg *ap, struct io *iop); |
448 | static int qgravechar(struct ioarg *ap, struct io *iop); |
449 | static int dolchar(struct ioarg *ap); |
450 | static int wdchar(struct ioarg *ap); |
451 | static void scraphere(void); |
452 | static void freehere(int area); |
453 | static void gethere(void); |
454 | static void markhere(char *s, struct ioword *iop); |
455 | static int herein(char *hname, int xdoll); |
456 | static int run(struct ioarg *argp, int (*f) (struct ioarg *)); |
457 | |
458 | |
459 | static int eofc(void); |
460 | static int readc(void); |
461 | static void unget(int c); |
462 | static void ioecho(char c); |
463 | |
464 | |
465 | /* |
466 | * IO control |
467 | */ |
468 | static void pushio(struct ioarg *argp, int (*f) (struct ioarg *)); |
469 | #define PUSHIO(what,arg,gen) ((temparg.what = (arg)), pushio(&temparg,(gen))) |
470 | static int remap(int fd); |
471 | static int openpipe(int *pv); |
472 | static void closepipe(int *pv); |
473 | static struct io *setbase(struct io *ip); |
474 | |
475 | /* -------- word.h -------- */ |
476 | |
477 | #define NSTART 16 /* default number of words to allow for initially */ |
478 | |
479 | struct wdblock { |
480 | short w_bsize; |
481 | short w_nword; |
482 | /* bounds are arbitrary */ |
483 | char *w_words[1]; |
484 | }; |
485 | |
486 | static struct wdblock *addword(char *wd, struct wdblock *wb); |
487 | static struct wdblock *newword(int nw); |
488 | static char **getwords(struct wdblock *wb); |
489 | |
490 | /* -------- misc stuff -------- */ |
491 | |
492 | static int dolabel(struct op *t, char **args); |
493 | static int dohelp(struct op *t, char **args); |
494 | static int dochdir(struct op *t, char **args); |
495 | static int doshift(struct op *t, char **args); |
496 | static int dologin(struct op *t, char **args); |
497 | static int doumask(struct op *t, char **args); |
498 | static int doexec(struct op *t, char **args); |
499 | static int dodot(struct op *t, char **args); |
500 | static int dowait(struct op *t, char **args); |
501 | static int doread(struct op *t, char **args); |
502 | static int doeval(struct op *t, char **args); |
503 | static int dotrap(struct op *t, char **args); |
504 | static int dobreak(struct op *t, char **args); |
505 | static int doexit(struct op *t, char **args); |
506 | static int doexport(struct op *t, char **args); |
507 | static int doreadonly(struct op *t, char **args); |
508 | static int doset(struct op *t, char **args); |
509 | static int dotimes(struct op *t, char **args); |
510 | static int docontinue(struct op *t, char **args); |
511 | |
512 | static int forkexec(struct op *t, int *pin, int *pout, int no_fork, char **wp); |
513 | static int execute(struct op *t, int *pin, int *pout, int no_fork); |
514 | static int iosetup(struct ioword *iop, int pipein, int pipeout); |
515 | static void brkset(struct brkcon *bc); |
516 | static int getsig(char *s); |
517 | static void setsig(int n, sighandler_t f); |
518 | static int getn(char *as); |
519 | static int brkcontin(char *cp, int val); |
520 | static void rdexp(char **wp, void (*f) (struct var *), int key); |
521 | static void badid(char *s); |
522 | static void varput(char *s, int out); |
523 | static int expand(const char *cp, struct wdblock **wbp, int f); |
524 | static char *blank(int f); |
525 | static int dollar(int quoted); |
526 | static int grave(int quoted); |
527 | static void globname(char *we, char *pp); |
528 | static char *generate(char *start1, char *end1, char *middle, char *end); |
529 | static int anyspcl(struct wdblock *wb); |
530 | static void readhere(char **name, char *s, int ec); |
531 | static int xxchar(struct ioarg *ap); |
532 | |
533 | struct here { |
534 | char *h_tag; |
535 | char h_dosub; |
536 | struct ioword *h_iop; |
537 | struct here *h_next; |
538 | }; |
539 | |
540 | static const char *const signame[] = { |
541 | "Signal 0", |
542 | "Hangup", |
543 | NULL, /* interrupt */ |
544 | "Quit", |
545 | "Illegal instruction", |
546 | "Trace/BPT trap", |
547 | "Abort", |
548 | "Bus error", |
549 | "Floating Point Exception", |
550 | "Killed", |
551 | "SIGUSR1", |
552 | "SIGSEGV", |
553 | "SIGUSR2", |
554 | NULL, /* broken pipe */ |
555 | "Alarm clock", |
556 | "Terminated" |
557 | }; |
558 | |
559 | |
560 | typedef int (*builtin_func_ptr)(struct op *, char **); |
561 | |
562 | struct builtincmd { |
563 | const char *name; |
564 | builtin_func_ptr builtinfunc; |
565 | }; |
566 | |
567 | static const struct builtincmd builtincmds[] = { |
568 | { "." , dodot }, |
569 | { ":" , dolabel }, |
570 | { "break" , dobreak }, |
571 | { "cd" , dochdir }, |
572 | { "continue", docontinue }, |
573 | { "eval" , doeval }, |
574 | { "exec" , doexec }, |
575 | { "exit" , doexit }, |
576 | { "export" , doexport }, |
577 | { "help" , dohelp }, |
578 | { "login" , dologin }, |
579 | { "newgrp" , dologin }, |
580 | { "read" , doread }, |
581 | { "readonly", doreadonly }, |
582 | { "set" , doset }, |
583 | { "shift" , doshift }, |
584 | { "times" , dotimes }, |
585 | { "trap" , dotrap }, |
586 | { "umask" , doumask }, |
587 | { "wait" , dowait }, |
588 | { NULL , NULL }, |
589 | }; |
590 | |
591 | static struct op *dowholefile(int /*, int*/); |
592 | |
593 | |
594 | /* Globals */ |
595 | static char **dolv; |
596 | static int dolc; |
597 | static uint8_t exstat; |
598 | static smallint gflg; /* (seems to be a parse error indicator) */ |
599 | static smallint interactive; /* Is this an interactive shell */ |
600 | static smallint execflg; |
601 | static smallint isbreak; /* "break" statement was seen */ |
602 | static int multiline; /* '\n' changed to ';' (counter) */ |
603 | static struct op *outtree; /* result from parser */ |
604 | static xint *failpt; |
605 | static xint *errpt; |
606 | static struct brkcon *brklist; |
607 | static struct wdblock *wdlist; |
608 | static struct wdblock *iolist; |
609 | |
610 | #ifdef MSHDEBUG |
611 | static struct var *mshdbg_var; |
612 | #endif |
613 | static struct var *vlist; /* dictionary */ |
614 | static struct var *homedir; /* home directory */ |
615 | static struct var *prompt; /* main prompt */ |
616 | static struct var *cprompt; /* continuation prompt */ |
617 | static struct var *path; /* search path for commands */ |
618 | static struct var *shell; /* shell to interpret command files */ |
619 | static struct var *ifs; /* field separators */ |
620 | |
621 | static int areanum; /* current allocation area */ |
622 | static smallint intr; /* interrupt pending (bool) */ |
623 | static smallint heedint = 1; /* heed interrupt signals (bool) */ |
624 | static int inparse; |
625 | static char *null = (char*)""; /* null value for variable */ |
626 | static void (*qflag)(int) = SIG_IGN; |
627 | static int startl; |
628 | static int peeksym; |
629 | static int nlseen; |
630 | static int iounit = IODEFAULT; |
631 | static YYSTYPE yylval; |
632 | static char *elinep; /* done in main(): = line + sizeof(line) - 5 */ |
633 | |
634 | static struct here *inhere; /* list of hear docs while parsing */ |
635 | static struct here *acthere; /* list of active here documents */ |
636 | static struct region *areabot; /* bottom of area */ |
637 | static struct region *areatop; /* top of area */ |
638 | static struct region *areanxt; /* starting point of scan */ |
639 | static void *brktop; |
640 | static void *brkaddr; |
641 | |
642 | #define AFID_NOBUF (~0) |
643 | #define AFID_ID 0 |
644 | |
645 | |
646 | /* |
647 | * parsing & execution environment |
648 | */ |
649 | struct env { |
650 | char *linep; |
651 | struct io *iobase; |
652 | struct io *iop; |
653 | xint *errpt; /* void * */ |
654 | int iofd; |
655 | struct env *oenv; |
656 | }; |
657 | |
658 | |
659 | struct globals { |
660 | struct env global_env; |
661 | struct ioarg temparg; // = { .afid = AFID_NOBUF }; /* temporary for PUSHIO */ |
662 | unsigned bufid; // = AFID_ID; /* buffer id counter */ |
663 | char ourtrap[_NSIG + 1]; |
664 | char *trap[_NSIG + 1]; |
665 | struct iobuf sharedbuf; /* in main(): set to { AFID_NOBUF } */ |
666 | struct iobuf mainbuf; /* in main(): set to { AFID_NOBUF } */ |
667 | struct ioarg ioargstack[NPUSH]; |
668 | /* |
669 | * flags: |
670 | * -e: quit on error |
671 | * -k: look for name=value everywhere on command line |
672 | * -n: no execution |
673 | * -t: exit after reading and executing one command |
674 | * -v: echo as read |
675 | * -x: trace |
676 | * -u: unset variables net diagnostic |
677 | */ |
678 | char flags['z' - 'a' + 1]; |
679 | char filechar_cmdbuf[BUFSIZ]; |
680 | char line[LINELIM]; |
681 | char child_cmd[LINELIM]; |
682 | |
683 | struct io iostack[NPUSH]; |
684 | |
685 | char grave__var_name[LINELIM]; |
686 | char grave__alt_value[LINELIM]; |
687 | }; |
688 | |
689 | #define G (*ptr_to_globals) |
690 | #define global_env (G.global_env ) |
691 | #define temparg (G.temparg ) |
692 | #define bufid (G.bufid ) |
693 | #define ourtrap (G.ourtrap ) |
694 | #define trap (G.trap ) |
695 | #define sharedbuf (G.sharedbuf ) |
696 | #define mainbuf (G.mainbuf ) |
697 | #define ioargstack (G.ioargstack ) |
698 | /* this looks weird, but is OK ... we index FLAG with 'a'...'z' */ |
699 | #define FLAG (G.flags - 'a' ) |
700 | #define filechar_cmdbuf (G.filechar_cmdbuf) |
701 | #define line (G.line ) |
702 | #define child_cmd (G.child_cmd ) |
703 | #define iostack (G.iostack ) |
704 | #define INIT_G() do { \ |
705 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ |
706 | global_env.linep = line; \ |
707 | global_env.iobase = iostack; \ |
708 | global_env.iop = iostack - 1; \ |
709 | global_env.iofd = FDBASE; \ |
710 | temparg.afid = AFID_NOBUF; \ |
711 | bufid = AFID_ID; \ |
712 | } while (0) |
713 | |
714 | |
715 | /* in substitution */ |
716 | #define INSUB() (global_env.iop->task == XGRAVE || global_env.iop->task == XDOLL) |
717 | |
718 | #define RUN(what, arg, gen) ((temparg.what = (arg)), run(&temparg, (gen))) |
719 | |
720 | #ifdef MSHDEBUG |
721 | static void print_tree(struct op *head) |
722 | { |
723 | if (head == NULL) { |
724 | DBGPRINTF(("PRINT_TREE: no tree\n")); |
725 | return; |
726 | } |
727 | |
728 | DBGPRINTF(("NODE: %p, left %p, right %p\n", head, head->left, |
729 | head->right)); |
730 | |
731 | if (head->left) |
732 | print_tree(head->left); |
733 | |
734 | if (head->right) |
735 | print_tree(head->right); |
736 | } |
737 | #endif /* MSHDEBUG */ |
738 | |
739 | |
740 | /* |
741 | * IO functions |
742 | */ |
743 | static void prs(const char *s) |
744 | { |
745 | if (*s) |
746 | write(STDERR_FILENO, s, strlen(s)); |
747 | } |
748 | |
749 | static void prn(unsigned u) |
750 | { |
751 | prs(itoa(u)); |
752 | } |
753 | |
754 | static void echo(char **wp) |
755 | { |
756 | int i; |
757 | |
758 | prs("+"); |
759 | for (i = 0; wp[i]; i++) { |
760 | if (i) |
761 | prs(" "); |
762 | prs(wp[i]); |
763 | } |
764 | prs("\n"); |
765 | } |
766 | |
767 | static void closef(int i) |
768 | { |
769 | if (i > 2) |
770 | close(i); |
771 | } |
772 | |
773 | static void closeall(void) |
774 | { |
775 | int u; |
776 | |
777 | for (u = NUFILE; u < NOFILE;) |
778 | close(u++); |
779 | } |
780 | |
781 | |
782 | /* fail but return to process next command */ |
783 | static void fail(void) NORETURN; |
784 | static void fail(void) |
785 | { |
786 | longjmp(failpt, 1); |
787 | /* NOTREACHED */ |
788 | } |
789 | |
790 | /* abort shell (or fail in subshell) */ |
791 | static void leave(void) NORETURN; |
792 | static void leave(void) |
793 | { |
794 | DBGPRINTF(("LEAVE: leave called!\n")); |
795 | |
796 | if (execflg) |
797 | fail(); |
798 | scraphere(); |
799 | freehere(1); |
800 | runtrap(0); |
801 | _exit(exstat); |
802 | /* NOTREACHED */ |
803 | } |
804 | |
805 | static void warn(const char *s) |
806 | { |
807 | if (*s) { |
808 | prs(s); |
809 | if (!exstat) |
810 | exstat = 255; |
811 | } |
812 | prs("\n"); |
813 | if (FLAG['e']) |
814 | leave(); |
815 | } |
816 | |
817 | static void err(const char *s) |
818 | { |
819 | warn(s); |
820 | if (FLAG['n']) |
821 | return; |
822 | if (!interactive) |
823 | leave(); |
824 | if (global_env.errpt) |
825 | longjmp(global_env.errpt, 1); |
826 | closeall(); |
827 | global_env.iop = global_env.iobase = iostack; |
828 | } |
829 | |
830 | |
831 | /* -------- area.c -------- */ |
832 | |
833 | /* |
834 | * All memory between (char *)areabot and (char *)(areatop+1) is |
835 | * exclusively administered by the area management routines. |
836 | * It is assumed that sbrk() and brk() manipulate the high end. |
837 | */ |
838 | |
839 | #define sbrk(X) ({ \ |
840 | void * __q = (void *)-1; \ |
841 | if (brkaddr + (int)(X) < brktop) { \ |
842 | __q = brkaddr; \ |
843 | brkaddr += (int)(X); \ |
844 | } \ |
845 | __q; \ |
846 | }) |
847 | |
848 | static void initarea(void) |
849 | { |
850 | brkaddr = xmalloc(AREASIZE); |
851 | brktop = brkaddr + AREASIZE; |
852 | |
853 | while ((long) sbrk(0) & ALIGN) |
854 | sbrk(1); |
855 | areabot = (struct region *) sbrk(REGSIZE); |
856 | |
857 | areabot->next = areabot; |
858 | areabot->area = BUSY; |
859 | areatop = areabot; |
860 | areanxt = areabot; |
861 | } |
862 | |
863 | static char *getcell(unsigned nbytes) |
864 | { |
865 | int nregio; |
866 | struct region *p, *q; |
867 | int i; |
868 | |
869 | if (nbytes == 0) { |
870 | puts("getcell(0)"); |
871 | abort(); |
872 | } |
873 | /* silly and defeats the algorithm */ |
874 | /* |
875 | * round upwards and add administration area |
876 | */ |
877 | nregio = (nbytes + (REGSIZE - 1)) / REGSIZE + 1; |
878 | p = areanxt; |
879 | for (;;) { |
880 | if (p->area > areanum) { |
881 | /* |
882 | * merge free cells |
883 | */ |
884 | while ((q = p->next)->area > areanum && q != areanxt) |
885 | p->next = q->next; |
886 | /* |
887 | * exit loop if cell big enough |
888 | */ |
889 | if (q >= p + nregio) |
890 | goto found; |
891 | } |
892 | p = p->next; |
893 | if (p == areanxt) |
894 | break; |
895 | } |
896 | i = nregio >= GROWBY ? nregio : GROWBY; |
897 | p = (struct region *) sbrk(i * REGSIZE); |
898 | if (p == (struct region *) -1) |
899 | return NULL; |
900 | p--; |
901 | if (p != areatop) { |
902 | puts("not contig"); |
903 | abort(); /* allocated areas are contiguous */ |
904 | } |
905 | q = p + i; |
906 | p->next = q; |
907 | p->area = FREE; |
908 | q->next = areabot; |
909 | q->area = BUSY; |
910 | areatop = q; |
911 | found: |
912 | /* |
913 | * we found a FREE area big enough, pointed to by 'p', and up to 'q' |
914 | */ |
915 | areanxt = p + nregio; |
916 | if (areanxt < q) { |
917 | /* |
918 | * split into requested area and rest |
919 | */ |
920 | if (areanxt + 1 > q) { |
921 | puts("OOM"); |
922 | abort(); /* insufficient space left for admin */ |
923 | } |
924 | areanxt->next = q; |
925 | areanxt->area = FREE; |
926 | p->next = areanxt; |
927 | } |
928 | p->area = areanum; |
929 | return (char *) (p + 1); |
930 | } |
931 | |
932 | static void freecell(char *cp) |
933 | { |
934 | struct region *p; |
935 | |
936 | p = (struct region *) cp; |
937 | if (p != NULL) { |
938 | p--; |
939 | if (p < areanxt) |
940 | areanxt = p; |
941 | p->area = FREE; |
942 | } |
943 | } |
944 | #define DELETE(obj) freecell((char *)obj) |
945 | |
946 | static void freearea(int a) |
947 | { |
948 | struct region *p, *top; |
949 | |
950 | top = areatop; |
951 | for (p = areabot; p != top; p = p->next) |
952 | if (p->area >= a) |
953 | p->area = FREE; |
954 | } |
955 | |
956 | static void setarea(char *cp, int a) |
957 | { |
958 | struct region *p; |
959 | |
960 | p = (struct region *) cp; |
961 | if (p != NULL) |
962 | (p - 1)->area = a; |
963 | } |
964 | |
965 | static int getarea(char *cp) |
966 | { |
967 | return ((struct region *) cp - 1)->area; |
968 | } |
969 | |
970 | static void garbage(void) |
971 | { |
972 | struct region *p, *q, *top; |
973 | |
974 | top = areatop; |
975 | for (p = areabot; p != top; p = p->next) { |
976 | if (p->area > areanum) { |
977 | while ((q = p->next)->area > areanum) |
978 | p->next = q->next; |
979 | areanxt = p; |
980 | } |
981 | } |
982 | #ifdef SHRINKBY |
983 | if (areatop >= q + SHRINKBY && q->area > areanum) { |
984 | brk((char *) (q + 1)); |
985 | q->next = areabot; |
986 | q->area = BUSY; |
987 | areatop = q; |
988 | } |
989 | #endif |
990 | } |
991 | |
992 | static void *get_space(int n) |
993 | { |
994 | char *cp; |
995 | |
996 | cp = getcell(n); |
997 | if (cp == NULL) |
998 | err("out of string space"); |
999 | return cp; |
1000 | } |
1001 | |
1002 | static char *strsave(const char *s, int a) |
1003 | { |
1004 | char *cp; |
1005 | |
1006 | cp = get_space(strlen(s) + 1); |
1007 | if (cp == NULL) { |
1008 | // FIXME: I highly doubt this is good. |
1009 | return (char*)""; |
1010 | } |
1011 | setarea(cp, a); |
1012 | strcpy(cp, s); |
1013 | return cp; |
1014 | } |
1015 | |
1016 | |
1017 | /* -------- var.c -------- */ |
1018 | |
1019 | static int eqname(const char *n1, const char *n2) |
1020 | { |
1021 | for (; *n1 != '=' && *n1 != '\0'; n1++) |
1022 | if (*n2++ != *n1) |
1023 | return 0; |
1024 | return *n2 == '\0' || *n2 == '='; |
1025 | } |
1026 | |
1027 | static const char *findeq(const char *cp) |
1028 | { |
1029 | while (*cp != '\0' && *cp != '=') |
1030 | cp++; |
1031 | return cp; |
1032 | } |
1033 | |
1034 | /* |
1035 | * Find the given name in the dictionary |
1036 | * and return its value. If the name was |
1037 | * not previously there, enter it now and |
1038 | * return a null value. |
1039 | */ |
1040 | static struct var *lookup(const char *n) |
1041 | { |
1042 | // FIXME: dirty hack |
1043 | static struct var dummy; |
1044 | |
1045 | struct var *vp; |
1046 | const char *cp; |
1047 | char *xp; |
1048 | int c; |
1049 | |
1050 | if (isdigit(*n)) { |
1051 | dummy.name = (char*)n; |
1052 | for (c = 0; isdigit(*n) && c < 1000; n++) |
1053 | c = c * 10 + *n - '0'; |
1054 | dummy.status = RONLY; |
1055 | dummy.value = (c <= dolc ? dolv[c] : null); |
1056 | return &dummy; |
1057 | } |
1058 | |
1059 | for (vp = vlist; vp; vp = vp->next) |
1060 | if (eqname(vp->name, n)) |
1061 | return vp; |
1062 | |
1063 | cp = findeq(n); |
1064 | vp = get_space(sizeof(*vp)); |
1065 | if (vp == 0 || (vp->name = get_space((int) (cp - n) + 2)) == NULL) { |
1066 | dummy.name = dummy.value = (char*)""; |
1067 | return &dummy; |
1068 | } |
1069 | |
1070 | xp = vp->name; |
1071 | while ((*xp = *n++) != '\0' && *xp != '=') |
1072 | xp++; |
1073 | *xp++ = '='; |
1074 | *xp = '\0'; |
1075 | setarea((char *) vp, 0); |
1076 | setarea((char *) vp->name, 0); |
1077 | vp->value = null; |
1078 | vp->next = vlist; |
1079 | vp->status = GETCELL; |
1080 | vlist = vp; |
1081 | return vp; |
1082 | } |
1083 | |
1084 | /* |
1085 | * if name is not NULL, it must be |
1086 | * a prefix of the space `val', |
1087 | * and end with `='. |
1088 | * this is all so that exporting |
1089 | * values is reasonably painless. |
1090 | */ |
1091 | static void nameval(struct var *vp, const char *val, const char *name) |
1092 | { |
1093 | const char *cp; |
1094 | char *xp; |
1095 | int fl; |
1096 | |
1097 | if (vp->status & RONLY) { |
1098 | xp = vp->name; |
1099 | while (*xp && *xp != '=') |
1100 | fputc(*xp++, stderr); |
1101 | err(" is read-only"); |
1102 | return; |
1103 | } |
1104 | fl = 0; |
1105 | if (name == NULL) { |
1106 | xp = get_space(strlen(vp->name) + strlen(val) + 2); |
1107 | if (xp == NULL) |
1108 | return; |
1109 | /* make string: name=value */ |
1110 | setarea(xp, 0); |
1111 | name = xp; |
1112 | cp = vp->name; |
1113 | while ((*xp = *cp++) != '\0' && *xp != '=') |
1114 | xp++; |
1115 | *xp++ = '='; |
1116 | strcpy(xp, val); |
1117 | val = xp; |
1118 | fl = GETCELL; |
1119 | } |
1120 | if (vp->status & GETCELL) |
1121 | freecell(vp->name); /* form new string `name=value' */ |
1122 | vp->name = (char*)name; |
1123 | vp->value = (char*)val; |
1124 | vp->status |= fl; |
1125 | } |
1126 | |
1127 | /* |
1128 | * give variable at `vp' the value `val'. |
1129 | */ |
1130 | static void setval(struct var *vp, const char *val) |
1131 | { |
1132 | nameval(vp, val, NULL); |
1133 | } |
1134 | |
1135 | static void export(struct var *vp) |
1136 | { |
1137 | vp->status |= EXPORT; |
1138 | } |
1139 | |
1140 | static void ronly(struct var *vp) |
1141 | { |
1142 | if (isalpha(vp->name[0]) || vp->name[0] == '_') /* not an internal symbol */ |
1143 | vp->status |= RONLY; |
1144 | } |
1145 | |
1146 | static int isassign(const char *s) |
1147 | { |
1148 | unsigned char c; |
1149 | DBGPRINTF7(("ISASSIGN: enter, s=%s\n", s)); |
1150 | |
1151 | c = *s; |
1152 | /* no isalpha() - we shouldn't use locale */ |
1153 | /* c | 0x20 - lowercase (Latin) letters */ |
1154 | if (c != '_' && (unsigned)((c|0x20) - 'a') > 25) |
1155 | /* not letter */ |
1156 | return 0; |
1157 | |
1158 | while (1) { |
1159 | c = *++s; |
1160 | if (c == '=') |
1161 | return 1; |
1162 | if (c == '\0') |
1163 | return 0; |
1164 | if (c != '_' |
1165 | && (unsigned)(c - '0') > 9 /* not number */ |
1166 | && (unsigned)((c|0x20) - 'a') > 25 /* not letter */ |
1167 | ) { |
1168 | return 0; |
1169 | } |
1170 | } |
1171 | } |
1172 | |
1173 | static int assign(const char *s, int cf) |
1174 | { |
1175 | const char *cp; |
1176 | struct var *vp; |
1177 | |
1178 | DBGPRINTF7(("ASSIGN: enter, s=%s, cf=%d\n", s, cf)); |
1179 | |
1180 | if (!isalpha(*s) && *s != '_') |
1181 | return 0; |
1182 | for (cp = s; *cp != '='; cp++) |
1183 | if (*cp == '\0' || (!isalnum(*cp) && *cp != '_')) |
1184 | return 0; |
1185 | vp = lookup(s); |
1186 | nameval(vp, ++cp, cf == COPYV ? NULL : s); |
1187 | if (cf != COPYV) |
1188 | vp->status &= ~GETCELL; |
1189 | return 1; |
1190 | } |
1191 | |
1192 | static int checkname(char *cp) |
1193 | { |
1194 | DBGPRINTF7(("CHECKNAME: enter, cp=%s\n", cp)); |
1195 | |
1196 | if (!isalpha(*cp++) && *(cp - 1) != '_') |
1197 | return 0; |
1198 | while (*cp) |
1199 | if (!isalnum(*cp++) && *(cp - 1) != '_') |
1200 | return 0; |
1201 | return 1; |
1202 | } |
1203 | |
1204 | static void putvlist(int f, int out) |
1205 | { |
1206 | struct var *vp; |
1207 | |
1208 | for (vp = vlist; vp; vp = vp->next) { |
1209 | if (vp->status & f && (isalpha(*vp->name) || *vp->name == '_')) { |
1210 | if (vp->status & EXPORT) |
1211 | write(out, "export ", 7); |
1212 | if (vp->status & RONLY) |
1213 | write(out, "readonly ", 9); |
1214 | write(out, vp->name, (int) (findeq(vp->name) - vp->name)); |
1215 | write(out, "\n", 1); |
1216 | } |
1217 | } |
1218 | } |
1219 | |
1220 | |
1221 | /* |
1222 | * trap handling |
1223 | */ |
1224 | static void sig(int i) |
1225 | { |
1226 | trapset = i; |
1227 | signal(i, sig); |
1228 | } |
1229 | |
1230 | static void runtrap(int i) |
1231 | { |
1232 | char *trapstr; |
1233 | |
1234 | trapstr = trap[i]; |
1235 | if (trapstr == NULL) |
1236 | return; |
1237 | |
1238 | if (i == 0) |
1239 | trap[i] = NULL; |
1240 | |
1241 | RUN(aword, trapstr, nlchar); |
1242 | } |
1243 | |
1244 | |
1245 | static void setdash(void) |
1246 | { |
1247 | char *cp; |
1248 | int c; |
1249 | char m['z' - 'a' + 1]; |
1250 | |
1251 | cp = m; |
1252 | for (c = 'a'; c <= 'z'; c++) |
1253 | if (FLAG[c]) |
1254 | *cp++ = c; |
1255 | *cp = '\0'; |
1256 | setval(lookup("-"), m); |
1257 | } |
1258 | |
1259 | static int newfile(char *s) |
1260 | { |
1261 | int f; |
1262 | |
1263 | DBGPRINTF7(("NEWFILE: opening %s\n", s)); |
1264 | |
1265 | f = 0; |
1266 | if (NOT_LONE_DASH(s)) { |
1267 | DBGPRINTF(("NEWFILE: s is %s\n", s)); |
1268 | f = open(s, O_RDONLY); |
1269 | if (f < 0) { |
1270 | prs(s); |
1271 | err(": can't open"); |
1272 | return 1; |
1273 | } |
1274 | } |
1275 | |
1276 | next(remap(f)); |
1277 | return 0; |
1278 | } |
1279 | |
1280 | |
1281 | #ifdef UNUSED |
1282 | struct op *scantree(struct op *head) |
1283 | { |
1284 | struct op *dotnode; |
1285 | |
1286 | if (head == NULL) |
1287 | return NULL; |
1288 | |
1289 | if (head->left != NULL) { |
1290 | dotnode = scantree(head->left); |
1291 | if (dotnode) |
1292 | return dotnode; |
1293 | } |
1294 | |
1295 | if (head->right != NULL) { |
1296 | dotnode = scantree(head->right); |
1297 | if (dotnode) |
1298 | return dotnode; |
1299 | } |
1300 | |
1301 | if (head->op_words == NULL) |
1302 | return NULL; |
1303 | |
1304 | DBGPRINTF5(("SCANTREE: checking node %p\n", head)); |
1305 | |
1306 | if ((head->op_type != TDOT) && LONE_CHAR(head->op_words[0], '.')) { |
1307 | DBGPRINTF5(("SCANTREE: dot found in node %p\n", head)); |
1308 | return head; |
1309 | } |
1310 | |
1311 | return NULL; |
1312 | } |
1313 | #endif |
1314 | |
1315 | |
1316 | static void onecommand(void) |
1317 | { |
1318 | int i; |
1319 | jmp_buf m1; |
1320 | |
1321 | DBGPRINTF(("ONECOMMAND: enter, outtree=%p\n", outtree)); |
1322 | |
1323 | while (global_env.oenv) |
1324 | quitenv(); |
1325 | |
1326 | areanum = 1; |
1327 | freehere(areanum); |
1328 | freearea(areanum); |
1329 | garbage(); |
1330 | wdlist = NULL; |
1331 | iolist = NULL; |
1332 | global_env.errpt = NULL; |
1333 | global_env.linep = line; |
1334 | yynerrs = 0; |
1335 | multiline = 0; |
1336 | inparse = 1; |
1337 | intr = 0; |
1338 | execflg = 0; |
1339 | |
1340 | failpt = m1; |
1341 | setjmp(failpt); /* Bruce Evans' fix */ |
1342 | failpt = m1; |
1343 | if (setjmp(failpt) || yyparse() || intr) { |
1344 | DBGPRINTF(("ONECOMMAND: this is not good.\n")); |
1345 | |
1346 | while (global_env.oenv) |
1347 | quitenv(); |
1348 | scraphere(); |
1349 | if (!interactive && intr) |
1350 | leave(); |
1351 | inparse = 0; |
1352 | intr = 0; |
1353 | return; |
1354 | } |
1355 | |
1356 | inparse = 0; |
1357 | brklist = 0; |
1358 | intr = 0; |
1359 | execflg = 0; |
1360 | |
1361 | if (!FLAG['n']) { |
1362 | DBGPRINTF(("ONECOMMAND: calling execute, t=outtree=%p\n", |
1363 | outtree)); |
1364 | execute(outtree, NOPIPE, NOPIPE, /* no_fork: */ 0); |
1365 | } |
1366 | |
1367 | if (!interactive && intr) { |
1368 | execflg = 0; |
1369 | leave(); |
1370 | } |
1371 | |
1372 | i = trapset; |
1373 | if (i != 0) { |
1374 | trapset = 0; |
1375 | runtrap(i); |
1376 | } |
1377 | } |
1378 | |
1379 | static int newenv(int f) |
1380 | { |
1381 | struct env *ep; |
1382 | |
1383 | DBGPRINTF(("NEWENV: f=%d (indicates quitenv and return)\n", f)); |
1384 | |
1385 | if (f) { |
1386 | quitenv(); |
1387 | return 1; |
1388 | } |
1389 | |
1390 | ep = get_space(sizeof(*ep)); |
1391 | if (ep == NULL) { |
1392 | while (global_env.oenv) |
1393 | quitenv(); |
1394 | fail(); |
1395 | } |
1396 | *ep = global_env; |
1397 | global_env.oenv = ep; |
1398 | global_env.errpt = errpt; |
1399 | |
1400 | return 0; |
1401 | } |
1402 | |
1403 | static void quitenv(void) |
1404 | { |
1405 | struct env *ep; |
1406 | int fd; |
1407 | |
1408 | DBGPRINTF(("QUITENV: global_env.oenv=%p\n", global_env.oenv)); |
1409 | |
1410 | ep = global_env.oenv; |
1411 | if (ep != NULL) { |
1412 | fd = global_env.iofd; |
1413 | global_env = *ep; |
1414 | /* should close `'d files */ |
1415 | DELETE(ep); |
1416 | while (--fd >= global_env.iofd) |
1417 | close(fd); |
1418 | } |
1419 | } |
1420 | |
1421 | /* |
1422 | * Is character c in s? |
1423 | */ |
1424 | static int any(int c, const char *s) |
1425 | { |
1426 | while (*s) |
1427 | if (*s++ == c) |
1428 | return 1; |
1429 | return 0; |
1430 | } |
1431 | |
1432 | /* |
1433 | * Is any character from s1 in s2? |
1434 | */ |
1435 | static int anys(const char *s1, const char *s2) |
1436 | { |
1437 | while (*s1) |
1438 | if (any(*s1++, s2)) |
1439 | return 1; |
1440 | return 0; |
1441 | } |
1442 | |
1443 | static char *putn(int n) |
1444 | { |
1445 | return itoa(n); |
1446 | } |
1447 | |
1448 | static void next(int f) |
1449 | { |
1450 | PUSHIO(afile, f, filechar); |
1451 | } |
1452 | |
1453 | static void onintr(int s UNUSED_PARAM) /* ANSI C requires a parameter */ |
1454 | { |
1455 | signal(SIGINT, onintr); |
1456 | intr = 1; |
1457 | if (interactive) { |
1458 | if (inparse) { |
1459 | prs("\n"); |
1460 | fail(); |
1461 | } |
1462 | } else if (heedint) { |
1463 | execflg = 0; |
1464 | leave(); |
1465 | } |
1466 | } |
1467 | |
1468 | |
1469 | /* -------- gmatch.c -------- */ |
1470 | /* |
1471 | * int gmatch(string, pattern) |
1472 | * char *string, *pattern; |
1473 | * |
1474 | * Match a pattern as in sh(1). |
1475 | */ |
1476 | |
1477 | #define CMASK 0377 |
1478 | #define QUOTE 0200 |
1479 | #define QMASK (CMASK & ~QUOTE) |
1480 | #define NOT '!' /* might use ^ */ |
1481 | |
1482 | static const char *cclass(const char *p, int sub) |
1483 | { |
1484 | int c, d, not, found; |
1485 | |
1486 | not = (*p == NOT); |
1487 | if (not != 0) |
1488 | p++; |
1489 | found = not; |
1490 | do { |
1491 | if (*p == '\0') |
1492 | return NULL; |
1493 | c = *p & CMASK; |
1494 | if (p[1] == '-' && p[2] != ']') { |
1495 | d = p[2] & CMASK; |
1496 | p++; |
1497 | } else |
1498 | d = c; |
1499 | if (c == sub || (c <= sub && sub <= d)) |
1500 | found = !not; |
1501 | } while (*++p != ']'); |
1502 | return found ? p + 1 : NULL; |
1503 | } |
1504 | |
1505 | static int gmatch(const char *s, const char *p) |
1506 | { |
1507 | int sc, pc; |
1508 | |
1509 | if (s == NULL || p == NULL) |
1510 | return 0; |
1511 | |
1512 | while ((pc = *p++ & CMASK) != '\0') { |
1513 | sc = *s++ & QMASK; |
1514 | switch (pc) { |
1515 | case '[': |
1516 | p = cclass(p, sc); |
1517 | if (p == NULL) |
1518 | return 0; |
1519 | break; |
1520 | |
1521 | case '?': |
1522 | if (sc == 0) |
1523 | return 0; |
1524 | break; |
1525 | |
1526 | case '*': |
1527 | s--; |
1528 | do { |
1529 | if (*p == '\0' || gmatch(s, p)) |
1530 | return 1; |
1531 | } while (*s++ != '\0'); |
1532 | return 0; |
1533 | |
1534 | default: |
1535 | if (sc != (pc & ~QUOTE)) |
1536 | return 0; |
1537 | } |
1538 | } |
1539 | return *s == '\0'; |
1540 | } |
1541 | |
1542 | |
1543 | /* -------- csyn.c -------- */ |
1544 | /* |
1545 | * shell: syntax (C version) |
1546 | */ |
1547 | |
1548 | static void yyerror(const char *s) NORETURN; |
1549 | static void yyerror(const char *s) |
1550 | { |
1551 | yynerrs = 1; |
1552 | if (interactive && global_env.iop <= iostack) { |
1553 | multiline = 0; |
1554 | while (eofc() == 0 && yylex(0) != '\n') |
1555 | continue; |
1556 | } |
1557 | err(s); |
1558 | fail(); |
1559 | } |
1560 | |
1561 | static void zzerr(void) NORETURN; |
1562 | static void zzerr(void) |
1563 | { |
1564 | yyerror("syntax error"); |
1565 | } |
1566 | |
1567 | int yyparse(void) |
1568 | { |
1569 | DBGPRINTF7(("YYPARSE: enter...\n")); |
1570 | |
1571 | startl = 1; |
1572 | peeksym = 0; |
1573 | yynerrs = 0; |
1574 | outtree = c_list(); |
1575 | musthave('\n', 0); |
1576 | return yynerrs; /* 0/1 */ |
1577 | } |
1578 | |
1579 | static struct op *pipeline(int cf) |
1580 | { |
1581 | struct op *t, *p; |
1582 | int c; |
1583 | |
1584 | DBGPRINTF7(("PIPELINE: enter, cf=%d\n", cf)); |
1585 | |
1586 | t = command(cf); |
1587 | |
1588 | DBGPRINTF9(("PIPELINE: t=%p\n", t)); |
1589 | |
1590 | if (t != NULL) { |
1591 | while ((c = yylex(0)) == '|') { |
1592 | p = command(CONTIN); |
1593 | if (p == NULL) { |
1594 | DBGPRINTF8(("PIPELINE: error!\n")); |
1595 | zzerr(); |
1596 | } |
1597 | |
1598 | if (t->op_type != TPAREN && t->op_type != TCOM) { |
1599 | /* shell statement */ |
1600 | t = block(TPAREN, t, NOBLOCK, NOWORDS); |
1601 | } |
1602 | |
1603 | t = block(TPIPE, t, p, NOWORDS); |
1604 | } |
1605 | peeksym = c; |
1606 | } |
1607 | |
1608 | DBGPRINTF7(("PIPELINE: returning t=%p\n", t)); |
1609 | return t; |
1610 | } |
1611 | |
1612 | static struct op *andor(void) |
1613 | { |
1614 | struct op *t, *p; |
1615 | int c; |
1616 | |
1617 | DBGPRINTF7(("ANDOR: enter...\n")); |
1618 | |
1619 | t = pipeline(0); |
1620 | |
1621 | DBGPRINTF9(("ANDOR: t=%p\n", t)); |
1622 | |
1623 | if (t != NULL) { |
1624 | while ((c = yylex(0)) == LOGAND || c == LOGOR) { |
1625 | p = pipeline(CONTIN); |
1626 | if (p == NULL) { |
1627 | DBGPRINTF8(("ANDOR: error!\n")); |
1628 | zzerr(); |
1629 | } |
1630 | |
1631 | t = block(c == LOGAND ? TAND : TOR, t, p, NOWORDS); |
1632 | } |
1633 | |
1634 | peeksym = c; |
1635 | } |
1636 | |
1637 | DBGPRINTF7(("ANDOR: returning t=%p\n", t)); |
1638 | return t; |
1639 | } |
1640 | |
1641 | static struct op *c_list(void) |
1642 | { |
1643 | struct op *t, *p; |
1644 | int c; |
1645 | |
1646 | DBGPRINTF7(("C_LIST: enter...\n")); |
1647 | |
1648 | t = andor(); |
1649 | |
1650 | if (t != NULL) { |
1651 | peeksym = yylex(0); |
1652 | if (peeksym == '&') |
1653 | t = block(TASYNC, t, NOBLOCK, NOWORDS); |
1654 | |
1655 | while ((c = yylex(0)) == ';' || c == '&' |
1656 | || (multiline && c == '\n') |
1657 | ) { |
1658 | p = andor(); |
1659 | if (p== NULL) |
1660 | return t; |
1661 | |
1662 | peeksym = yylex(0); |
1663 | if (peeksym == '&') |
1664 | p = block(TASYNC, p, NOBLOCK, NOWORDS); |
1665 | |
1666 | t = list(t, p); |
1667 | } /* WHILE */ |
1668 | |
1669 | peeksym = c; |
1670 | } |
1671 | /* IF */ |
1672 | DBGPRINTF7(("C_LIST: returning t=%p\n", t)); |
1673 | return t; |
1674 | } |
1675 | |
1676 | static int synio(int cf) |
1677 | { |
1678 | struct ioword *iop; |
1679 | int i; |
1680 | int c; |
1681 | |
1682 | DBGPRINTF7(("SYNIO: enter, cf=%d\n", cf)); |
1683 | |
1684 | c = yylex(cf); |
1685 | if (c != '<' && c != '>') { |
1686 | peeksym = c; |
1687 | return 0; |
1688 | } |
1689 | |
1690 | i = yylval.i; |
1691 | musthave(WORD, 0); |
1692 | iop = io(iounit, i, yylval.cp); |
1693 | iounit = IODEFAULT; |
1694 | |
1695 | if (i & IOHERE) |
1696 | markhere(yylval.cp, iop); |
1697 | |
1698 | DBGPRINTF7(("SYNIO: returning 1\n")); |
1699 | return 1; |
1700 | } |
1701 | |
1702 | static void musthave(int c, int cf) |
1703 | { |
1704 | peeksym = yylex(cf); |
1705 | if (peeksym != c) { |
1706 | DBGPRINTF7(("MUSTHAVE: error!\n")); |
1707 | zzerr(); |
1708 | } |
1709 | |
1710 | peeksym = 0; |
1711 | } |
1712 | |
1713 | static struct op *simple(void) |
1714 | { |
1715 | struct op *t; |
1716 | |
1717 | t = NULL; |
1718 | for (;;) { |
1719 | switch (peeksym = yylex(0)) { |
1720 | case '<': |
1721 | case '>': |
1722 | (void) synio(0); |
1723 | break; |
1724 | |
1725 | case WORD: |
1726 | if (t == NULL) { |
1727 | t = newtp(); |
1728 | t->op_type = TCOM; |
1729 | } |
1730 | peeksym = 0; |
1731 | word(yylval.cp); |
1732 | break; |
1733 | |
1734 | default: |
1735 | return t; |
1736 | } |
1737 | } |
1738 | } |
1739 | |
1740 | static struct op *nested(int type, int mark) |
1741 | { |
1742 | struct op *t; |
1743 | |
1744 | DBGPRINTF3(("NESTED: enter, type=%d, mark=%d\n", type, mark)); |
1745 | |
1746 | multiline++; |
1747 | t = c_list(); |
1748 | musthave(mark, 0); |
1749 | multiline--; |
1750 | return block(type, t, NOBLOCK, NOWORDS); |
1751 | } |
1752 | |
1753 | static struct op *command(int cf) |
1754 | { |
1755 | struct op *t; |
1756 | struct wdblock *iosave; |
1757 | int c; |
1758 | |
1759 | DBGPRINTF(("COMMAND: enter, cf=%d\n", cf)); |
1760 | |
1761 | iosave = iolist; |
1762 | iolist = NULL; |
1763 | |
1764 | if (multiline) |
1765 | cf |= CONTIN; |
1766 | |
1767 | while (synio(cf)) |
1768 | cf = 0; |
1769 | |
1770 | c = yylex(cf); |
1771 | |
1772 | switch (c) { |
1773 | default: |
1774 | peeksym = c; |
1775 | t = simple(); |
1776 | if (t == NULL) { |
1777 | if (iolist == NULL) |
1778 | return NULL; |
1779 | t = newtp(); |
1780 | t->op_type = TCOM; |
1781 | } |
1782 | break; |
1783 | |
1784 | case '(': |
1785 | t = nested(TPAREN, ')'); |
1786 | break; |
1787 | |
1788 | case '{': |
1789 | t = nested(TBRACE, '}'); |
1790 | break; |
1791 | |
1792 | case FOR: |
1793 | t = newtp(); |
1794 | t->op_type = TFOR; |
1795 | musthave(WORD, 0); |
1796 | startl = 1; |
1797 | t->str = yylval.cp; |
1798 | multiline++; |
1799 | t->op_words = wordlist(); |
1800 | c = yylex(0); |
1801 | if (c != '\n' && c != ';') |
1802 | peeksym = c; |
1803 | t->left = dogroup(0); |
1804 | multiline--; |
1805 | break; |
1806 | |
1807 | case WHILE: |
1808 | case UNTIL: |
1809 | multiline++; |
1810 | t = newtp(); |
1811 | t->op_type = (c == WHILE ? TWHILE : TUNTIL); |
1812 | t->left = c_list(); |
1813 | t->right = dogroup(1); |
1814 | /* t->op_words = NULL; - newtp() did this */ |
1815 | multiline--; |
1816 | break; |
1817 | |
1818 | case CASE: |
1819 | t = newtp(); |
1820 | t->op_type = TCASE; |
1821 | musthave(WORD, 0); |
1822 | t->str = yylval.cp; |
1823 | startl++; |
1824 | multiline++; |
1825 | musthave(IN, CONTIN); |
1826 | startl++; |
1827 | |
1828 | t->left = caselist(); |
1829 | |
1830 | musthave(ESAC, 0); |
1831 | multiline--; |
1832 | break; |
1833 | |
1834 | case IF: |
1835 | multiline++; |
1836 | t = newtp(); |
1837 | t->op_type = TIF; |
1838 | t->left = c_list(); |
1839 | t->right = thenpart(); |
1840 | musthave(FI, 0); |
1841 | multiline--; |
1842 | break; |
1843 | |
1844 | case DOT: |
1845 | t = newtp(); |
1846 | t->op_type = TDOT; |
1847 | |
1848 | musthave(WORD, 0); /* gets name of file */ |
1849 | DBGPRINTF7(("COMMAND: DOT clause, yylval.cp is %s\n", yylval.cp)); |
1850 | |
1851 | word(yylval.cp); /* add word to wdlist */ |
1852 | word(NOWORD); /* terminate wdlist */ |
1853 | t->op_words = copyw(); /* dup wdlist */ |
1854 | break; |
1855 | |
1856 | } |
1857 | |
1858 | while (synio(0)) |
1859 | continue; |
1860 | |
1861 | t = namelist(t); |
1862 | iolist = iosave; |
1863 | |
1864 | DBGPRINTF(("COMMAND: returning %p\n", t)); |
1865 | |
1866 | return t; |
1867 | } |
1868 | |
1869 | static struct op *dowholefile(int type /*, int mark*/) |
1870 | { |
1871 | struct op *t; |
1872 | |
1873 | DBGPRINTF(("DOWHOLEFILE: enter, type=%d\n", type /*, mark*/)); |
1874 | |
1875 | multiline++; |
1876 | t = c_list(); |
1877 | multiline--; |
1878 | t = block(type, t, NOBLOCK, NOWORDS); |
1879 | DBGPRINTF(("DOWHOLEFILE: return t=%p\n", t)); |
1880 | return t; |
1881 | } |
1882 | |
1883 | static struct op *dogroup(int onlydone) |
1884 | { |
1885 | int c; |
1886 | struct op *mylist; |
1887 | |
1888 | c = yylex(CONTIN); |
1889 | if (c == DONE && onlydone) |
1890 | return NULL; |
1891 | if (c != DO) |
1892 | zzerr(); |
1893 | mylist = c_list(); |
1894 | musthave(DONE, 0); |
1895 | return mylist; |
1896 | } |
1897 | |
1898 | static struct op *thenpart(void) |
1899 | { |
1900 | int c; |
1901 | struct op *t; |
1902 | |
1903 | c = yylex(0); |
1904 | if (c != THEN) { |
1905 | peeksym = c; |
1906 | return NULL; |
1907 | } |
1908 | t = newtp(); |
1909 | /*t->op_type = 0; - newtp() did this */ |
1910 | t->left = c_list(); |
1911 | if (t->left == NULL) |
1912 | zzerr(); |
1913 | t->right = elsepart(); |
1914 | return t; |
1915 | } |
1916 | |
1917 | static struct op *elsepart(void) |
1918 | { |
1919 | int c; |
1920 | struct op *t; |
1921 | |
1922 | switch (c = yylex(0)) { |
1923 | case ELSE: |
1924 | t = c_list(); |
1925 | if (t == NULL) |
1926 | zzerr(); |
1927 | return t; |
1928 | |
1929 | case ELIF: |
1930 | t = newtp(); |
1931 | t->op_type = TELIF; |
1932 | t->left = c_list(); |
1933 | t->right = thenpart(); |
1934 | return t; |
1935 | |
1936 | default: |
1937 | peeksym = c; |
1938 | return NULL; |
1939 | } |
1940 | } |
1941 | |
1942 | static struct op *caselist(void) |
1943 | { |
1944 | struct op *t; |
1945 | |
1946 | t = NULL; |
1947 | while ((peeksym = yylex(CONTIN)) != ESAC) { |
1948 | DBGPRINTF(("CASELIST, doing yylex, peeksym=%d\n", peeksym)); |
1949 | t = list(t, casepart()); |
1950 | } |
1951 | |
1952 | DBGPRINTF(("CASELIST, returning t=%p\n", t)); |
1953 | return t; |
1954 | } |
1955 | |
1956 | static struct op *casepart(void) |
1957 | { |
1958 | struct op *t; |
1959 | |
1960 | DBGPRINTF7(("CASEPART: enter...\n")); |
1961 | |
1962 | t = newtp(); |
1963 | t->op_type = TPAT; |
1964 | t->op_words = pattern(); |
1965 | musthave(')', 0); |
1966 | t->left = c_list(); |
1967 | peeksym = yylex(CONTIN); |
1968 | if (peeksym != ESAC) |
1969 | musthave(BREAK, CONTIN); |
1970 | |
1971 | DBGPRINTF7(("CASEPART: made newtp(TPAT, t=%p)\n", t)); |
1972 | |
1973 | return t; |
1974 | } |
1975 | |
1976 | static char **pattern(void) |
1977 | { |
1978 | int c, cf; |
1979 | |
1980 | cf = CONTIN; |
1981 | do { |
1982 | musthave(WORD, cf); |
1983 | word(yylval.cp); |
1984 | cf = 0; |
1985 | c = yylex(0); |
1986 | } while (c == '|'); |
1987 | peeksym = c; |
1988 | word(NOWORD); |
1989 | |
1990 | return copyw(); |
1991 | } |
1992 | |
1993 | static char **wordlist(void) |
1994 | { |
1995 | int c; |
1996 | |
1997 | c = yylex(0); |
1998 | if (c != IN) { |
1999 | peeksym = c; |
2000 | return NULL; |
2001 | } |
2002 | startl = 0; |
2003 | while ((c = yylex(0)) == WORD) |
2004 | word(yylval.cp); |
2005 | word(NOWORD); |
2006 | peeksym = c; |
2007 | return copyw(); |
2008 | } |
2009 | |
2010 | /* |
2011 | * supporting functions |
2012 | */ |
2013 | static struct op *list(struct op *t1, struct op *t2) |
2014 | { |
2015 | DBGPRINTF7(("LIST: enter, t1=%p, t2=%p\n", t1, t2)); |
2016 | |
2017 | if (t1 == NULL) |
2018 | return t2; |
2019 | if (t2 == NULL) |
2020 | return t1; |
2021 | |
2022 | return block(TLIST, t1, t2, NOWORDS); |
2023 | } |
2024 | |
2025 | static struct op *block(int type, struct op *t1, struct op *t2, char **wp) |
2026 | { |
2027 | struct op *t; |
2028 | |
2029 | DBGPRINTF7(("BLOCK: enter, type=%d (%s)\n", type, T_CMD_NAMES[type])); |
2030 | |
2031 | t = newtp(); |
2032 | t->op_type = type; |
2033 | t->left = t1; |
2034 | t->right = t2; |
2035 | t->op_words = wp; |
2036 | |
2037 | DBGPRINTF7(("BLOCK: inserted %p between %p and %p\n", t, t1, t2)); |
2038 | |
2039 | return t; |
2040 | } |
2041 | |
2042 | /* See if given string is a shell multiline (FOR, IF, etc) */ |
2043 | static int rlookup(char *n) |
2044 | { |
2045 | struct res { |
2046 | char r_name[6]; |
2047 | int16_t r_val; |
2048 | }; |
2049 | static const struct res restab[] = { |
2050 | { "for" , FOR }, |
2051 | { "case" , CASE }, |
2052 | { "esac" , ESAC }, |
2053 | { "while", WHILE }, |
2054 | { "do" , DO }, |
2055 | { "done" , DONE }, |
2056 | { "if" , IF }, |
2057 | { "in" , IN }, |
2058 | { "then" , THEN }, |
2059 | { "else" , ELSE }, |
2060 | { "elif" , ELIF }, |
2061 | { "until", UNTIL }, |
2062 | { "fi" , FI }, |
2063 | { ";;" , BREAK }, |
2064 | { "||" , LOGOR }, |
2065 | { "&&" , LOGAND }, |
2066 | { "{" , '{' }, |
2067 | { "}" , '}' }, |
2068 | { "." , DOT }, |
2069 | { }, |
2070 | }; |
2071 | |
2072 | const struct res *rp; |
2073 | |
2074 | DBGPRINTF7(("RLOOKUP: enter, n is %s\n", n)); |
2075 | |
2076 | for (rp = restab; rp->r_name[0]; rp++) |
2077 | if (strcmp(rp->r_name, n) == 0) { |
2078 | DBGPRINTF7(("RLOOKUP: match, returning %d\n", rp->r_val)); |
2079 | return rp->r_val; /* Return numeric code for shell multiline */ |
2080 | } |
2081 | |
2082 | DBGPRINTF7(("RLOOKUP: NO match, returning 0\n")); |
2083 | return 0; /* Not a shell multiline */ |
2084 | } |
2085 | |
2086 | static struct op *newtp(void) |
2087 | { |
2088 | struct op *t; |
2089 | |
2090 | t = (struct op *) tree(sizeof(*t)); |
2091 | memset(t, 0, sizeof(*t)); |
2092 | |
2093 | DBGPRINTF3(("NEWTP: allocated %p\n", t)); |
2094 | |
2095 | return t; |
2096 | } |
2097 | |
2098 | static struct op *namelist(struct op *t) |
2099 | { |
2100 | DBGPRINTF7(("NAMELIST: enter, t=%p, type %s, iolist=%p\n", t, |
2101 | T_CMD_NAMES[t->op_type], iolist)); |
2102 | |
2103 | if (iolist) { |
2104 | iolist = addword((char *) NULL, iolist); |
2105 | t->ioact = copyio(); |
2106 | } else |
2107 | t->ioact = NULL; |
2108 | |
2109 | if (t->op_type != TCOM) { |
2110 | if (t->op_type != TPAREN && t->ioact != NULL) { |
2111 | t = block(TPAREN, t, NOBLOCK, NOWORDS); |
2112 | t->ioact = t->left->ioact; |
2113 | t->left->ioact = NULL; |
2114 | } |
2115 | return t; |
2116 | } |
2117 | |
2118 | word(NOWORD); |
2119 | t->op_words = copyw(); |
2120 | |
2121 | return t; |
2122 | } |
2123 | |
2124 | static char **copyw(void) |
2125 | { |
2126 | char **wd; |
2127 | |
2128 | wd = getwords(wdlist); |
2129 | wdlist = NULL; |
2130 | return wd; |
2131 | } |
2132 | |
2133 | static void word(char *cp) |
2134 | { |
2135 | wdlist = addword(cp, wdlist); |
2136 | } |
2137 | |
2138 | static struct ioword **copyio(void) |
2139 | { |
2140 | struct ioword **iop; |
2141 | |
2142 | iop = (struct ioword **) getwords(iolist); |
2143 | iolist = NULL; |
2144 | return iop; |
2145 | } |
2146 | |
2147 | static struct ioword *io(int u, int f, char *cp) |
2148 | { |
2149 | struct ioword *iop; |
2150 | |
2151 | iop = (struct ioword *) tree(sizeof(*iop)); |
2152 | iop->io_fd = u; |
2153 | iop->io_flag = f; |
2154 | iop->io_name = cp; |
2155 | iolist = addword((char *) iop, iolist); |
2156 | return iop; |
2157 | } |
2158 | |
2159 | static int yylex(int cf) |
2160 | { |
2161 | int c, c1; |
2162 | int atstart; |
2163 | |
2164 | c = peeksym; |
2165 | if (c > 0) { |
2166 | peeksym = 0; |
2167 | if (c == '\n') |
2168 | startl = 1; |
2169 | return c; |
2170 | } |
2171 | |
2172 | nlseen = 0; |
2173 | atstart = startl; |
2174 | startl = 0; |
2175 | yylval.i = 0; |
2176 | global_env.linep = line; |
2177 | |
2178 | /* MALAMO */ |
2179 | line[LINELIM - 1] = '\0'; |
2180 | |
2181 | loop: |
2182 | while ((c = my_getc(0)) == ' ' || c == '\t') /* Skip whitespace */ |
2183 | continue; |
2184 | |
2185 | switch (c) { |
2186 | default: |
2187 | if (any(c, "0123456789")) { |
2188 | c1 = my_getc(0); |
2189 | unget(c1); |
2190 | if (c1 == '<' || c1 == '>') { |
2191 | iounit = c - '0'; |
2192 | goto loop; |
2193 | } |
2194 | *global_env.linep++ = c; |
2195 | c = c1; |
2196 | } |
2197 | break; |
2198 | |
2199 | case '#': /* Comment, skip to next newline or End-of-string */ |
2200 | while ((c = my_getc(0)) != '\0' && c != '\n') |
2201 | continue; |
2202 | unget(c); |
2203 | goto loop; |
2204 | |
2205 | case 0: |
2206 | DBGPRINTF5(("YYLEX: return 0, c=%d\n", c)); |
2207 | return c; |
2208 | |
2209 | case '$': |
2210 | DBGPRINTF9(("YYLEX: found $\n")); |
2211 | *global_env.linep++ = c; |
2212 | c = my_getc(0); |
2213 | if (c == '{') { |
2214 | c = collect(c, '}'); |
2215 | if (c != '\0') |
2216 | return c; |
2217 | goto pack; |
2218 | } |
2219 | break; |
2220 | |
2221 | case '`': |
2222 | case '\'': |
2223 | case '"': |
2224 | c = collect(c, c); |
2225 | if (c != '\0') |
2226 | return c; |
2227 | goto pack; |
2228 | |
2229 | case '|': |
2230 | case '&': |
2231 | case ';': |
2232 | startl = 1; |
2233 | /* If more chars process them, else return NULL char */ |
2234 | c1 = dual(c); |
2235 | if (c1 != '\0') |
2236 | return c1; |
2237 | return c; |
2238 | |
2239 | case '^': |
2240 | startl = 1; |
2241 | return '|'; |
2242 | case '>': |
2243 | case '<': |
2244 | diag(c); |
2245 | return c; |
2246 | |
2247 | case '\n': |
2248 | nlseen++; |
2249 | gethere(); |
2250 | startl = 1; |
2251 | if (multiline || cf & CONTIN) { |
2252 | if (interactive && global_env.iop <= iostack) { |
2253 | #if ENABLE_FEATURE_EDITING |
2254 | current_prompt = cprompt->value; |
2255 | #else |
2256 | prs(cprompt->value); |
2257 | #endif |
2258 | } |
2259 | if (cf & CONTIN) |
2260 | goto loop; |
2261 | } |
2262 | return c; |
2263 | |
2264 | case '(': |
2265 | case ')': |
2266 | startl = 1; |
2267 | return c; |
2268 | } |
2269 | |
2270 | unget(c); |
2271 | |
2272 | pack: |
2273 | while ((c = my_getc(0)) != '\0' && !any(c, "`$ '\"\t;&<>()|^\n")) { |
2274 | if (global_env.linep >= elinep) |
2275 | err("word too long"); |
2276 | else |
2277 | *global_env.linep++ = c; |
2278 | }; |
2279 | |
2280 | unget(c); |
2281 | |
2282 | if (any(c, "\"'`$")) |
2283 | goto loop; |
2284 | |
2285 | *global_env.linep++ = '\0'; |
2286 | |
2287 | if (atstart) { |
2288 | c = rlookup(line); |
2289 | if (c != 0) { |
2290 | startl = 1; |
2291 | return c; |
2292 | } |
2293 | } |
2294 | |
2295 | yylval.cp = strsave(line, areanum); |
2296 | return WORD; |
2297 | } |
2298 | |
2299 | |
2300 | static int collect(int c, int c1) |
2301 | { |
2302 | char s[2]; |
2303 | |
2304 | DBGPRINTF8(("COLLECT: enter, c=%d, c1=%d\n", c, c1)); |
2305 | |
2306 | *global_env.linep++ = c; |
2307 | while ((c = my_getc(c1)) != c1) { |
2308 | if (c == 0) { |
2309 | unget(c); |
2310 | s[0] = c1; |
2311 | s[1] = 0; |
2312 | prs("no closing "); |
2313 | yyerror(s); |
2314 | return YYERRCODE; |
2315 | } |
2316 | if (interactive && c == '\n' && global_env.iop <= iostack) { |
2317 | #if ENABLE_FEATURE_EDITING |
2318 | current_prompt = cprompt->value; |
2319 | #else |
2320 | prs(cprompt->value); |
2321 | #endif |
2322 | } |
2323 | *global_env.linep++ = c; |
2324 | } |
2325 | |
2326 | *global_env.linep++ = c; |
2327 | |
2328 | DBGPRINTF8(("COLLECT: return 0, line is %s\n", line)); |
2329 | |
2330 | return 0; |
2331 | } |
2332 | |
2333 | /* "multiline commands" helper func */ |
2334 | /* see if next 2 chars form a shell multiline */ |
2335 | static int dual(int c) |
2336 | { |
2337 | char s[3]; |
2338 | char *cp = s; |
2339 | |
2340 | DBGPRINTF8(("DUAL: enter, c=%d\n", c)); |
2341 | |
2342 | *cp++ = c; /* c is the given "peek" char */ |
2343 | *cp++ = my_getc(0); /* get next char of input */ |
2344 | *cp = '\0'; /* add EOS marker */ |
2345 | |
2346 | c = rlookup(s); /* see if 2 chars form a shell multiline */ |
2347 | if (c == 0) |
2348 | unget(*--cp); /* String is not a shell multiline, put peek char back */ |
2349 | |
2350 | return c; /* String is multiline, return numeric multiline (restab) code */ |
2351 | } |
2352 | |
2353 | static void diag(int ec) |
2354 | { |
2355 | int c; |
2356 | |
2357 | DBGPRINTF8(("DIAG: enter, ec=%d\n", ec)); |
2358 | |
2359 | c = my_getc(0); |
2360 | if (c == '>' || c == '<') { |
2361 | if (c != ec) |
2362 | zzerr(); |
2363 | yylval.i = (ec == '>' ? IOWRITE | IOCAT : IOHERE); |
2364 | c = my_getc(0); |
2365 | } else |
2366 | yylval.i = (ec == '>' ? IOWRITE : IOREAD); |
2367 | if (c != '&' || yylval.i == IOHERE) |
2368 | unget(c); |
2369 | else |
2370 | yylval.i |= IODUP; |
2371 | } |
2372 | |
2373 | static char *tree(unsigned size) |
2374 | { |
2375 | char *t; |
2376 | |
2377 | t = getcell(size); |
2378 | if (t == NULL) { |
2379 | DBGPRINTF2(("TREE: getcell(%d) failed!\n", size)); |
2380 | prs("command line too complicated\n"); |
2381 | fail(); |
2382 | /* NOTREACHED */ |
2383 | } |
2384 | return t; |
2385 | } |
2386 | |
2387 | |
2388 | /* VARARGS1 */ |
2389 | /* ARGSUSED */ |
2390 | |
2391 | /* -------- exec.c -------- */ |
2392 | |
2393 | static struct op **find1case(struct op *t, const char *w) |
2394 | { |
2395 | struct op *t1; |
2396 | struct op **tp; |
2397 | char **wp; |
2398 | char *cp; |
2399 | |
2400 | if (t == NULL) { |
2401 | DBGPRINTF3(("FIND1CASE: enter, t==NULL, returning.\n")); |
2402 | return NULL; |
2403 | } |
2404 | |
2405 | DBGPRINTF3(("FIND1CASE: enter, t->op_type=%d (%s)\n", t->op_type, |
2406 | T_CMD_NAMES[t->op_type])); |
2407 | |
2408 | if (t->op_type == TLIST) { |
2409 | tp = find1case(t->left, w); |
2410 | if (tp != NULL) { |
2411 | DBGPRINTF3(("FIND1CASE: found one to the left, returning tp=%p\n", tp)); |
2412 | return tp; |
2413 | } |
2414 | t1 = t->right; /* TPAT */ |
2415 | } else |
2416 | t1 = t; |
2417 | |
2418 | for (wp = t1->op_words; *wp;) { |
2419 | cp = evalstr(*wp++, DOSUB); |
2420 | if (cp && gmatch(w, cp)) { |
2421 | DBGPRINTF3(("FIND1CASE: returning &t1->left= %p.\n", |
2422 | &t1->left)); |
2423 | return &t1->left; |
2424 | } |
2425 | } |
2426 | |
2427 | DBGPRINTF(("FIND1CASE: returning NULL\n")); |
2428 | return NULL; |
2429 | } |
2430 | |
2431 | static struct op *findcase(struct op *t, const char *w) |
2432 | { |
2433 | struct op **tp; |
2434 | |
2435 | tp = find1case(t, w); |
2436 | return tp != NULL ? *tp : NULL; |
2437 | } |
2438 | |
2439 | /* |
2440 | * execute tree |
2441 | */ |
2442 | |
2443 | static int execute(struct op *t, int *pin, int *pout, int no_fork) |
2444 | { |
2445 | struct op *t1; |
2446 | volatile int i, rv, a; |
2447 | const char *cp; |
2448 | char **wp, **wp2; |
2449 | struct var *vp; |
2450 | struct op *outtree_save; |
2451 | struct brkcon bc; |
2452 | |
2453 | #if __GNUC__ |
2454 | /* Avoid longjmp clobbering */ |
2455 | (void) ℘ |
2456 | #endif |
2457 | |
2458 | if (t == NULL) { |
2459 | DBGPRINTF4(("EXECUTE: enter, t==null, returning.\n")); |
2460 | return 0; |
2461 | } |
2462 | |
2463 | DBGPRINTF(("EXECUTE: t=%p, t->op_type=%d (%s), t->op_words is %s\n", t, |
2464 | t->op_type, T_CMD_NAMES[t->op_type], |
2465 | ((t->op_words == NULL) ? "NULL" : t->op_words[0]))); |
2466 | |
2467 | rv = 0; |
2468 | a = areanum++; |
2469 | wp2 = t->op_words; |
2470 | wp = (wp2 != NULL) |
2471 | ? eval(wp2, t->op_type == TCOM ? DOALL : DOALL & ~DOKEY) |
2472 | : NULL; |
2473 | |
2474 | switch (t->op_type) { |
2475 | case TDOT: |
2476 | DBGPRINTF3(("EXECUTE: TDOT\n")); |
2477 | |
2478 | outtree_save = outtree; |
2479 | |
2480 | newfile(evalstr(t->op_words[0], DOALL)); |
2481 | |
2482 | t->left = dowholefile(TLIST /*, 0*/); |
2483 | t->right = NULL; |
2484 | |
2485 | outtree = outtree_save; |
2486 | |
2487 | if (t->left) |
2488 | rv = execute(t->left, pin, pout, /* no_fork: */ 0); |
2489 | if (t->right) |
2490 | rv = execute(t->right, pin, pout, /* no_fork: */ 0); |
2491 | break; |
2492 | |
2493 | case TPAREN: |
2494 | rv = execute(t->left, pin, pout, /* no_fork: */ 0); |
2495 | break; |
2496 | |
2497 | case TCOM: |
2498 | rv = forkexec(t, pin, pout, no_fork, wp); |
2499 | break; |
2500 | |
2501 | case TPIPE: |
2502 | { |
2503 | int pv[2]; |
2504 | |
2505 | rv = openpipe(pv); |
2506 | if (rv < 0) |
2507 | break; |
2508 | pv[0] = remap(pv[0]); |
2509 | pv[1] = remap(pv[1]); |
2510 | (void) execute(t->left, pin, pv, /* no_fork: */ 0); |
2511 | rv = execute(t->right, pv, pout, /* no_fork: */ 0); |
2512 | } |
2513 | break; |
2514 | |
2515 | case TLIST: |
2516 | (void) execute(t->left, pin, pout, /* no_fork: */ 0); |
2517 | rv = execute(t->right, pin, pout, /* no_fork: */ 0); |
2518 | break; |
2519 | |
2520 | case TASYNC: |
2521 | { |
2522 | smallint hinteractive = interactive; |
2523 | |
2524 | DBGPRINTF7(("EXECUTE: TASYNC clause, calling vfork()...\n")); |
2525 | |
2526 | i = vfork(); |
2527 | if (i == 0) { /* child */ |
2528 | signal(SIGINT, SIG_IGN); |
2529 | signal(SIGQUIT, SIG_IGN); |
2530 | if (interactive) |
2531 | signal(SIGTERM, SIG_DFL); |
2532 | interactive = 0; |
2533 | if (pin == NULL) { |
2534 | close(0); |
2535 | xopen(bb_dev_null, O_RDONLY); |
2536 | } |
2537 | _exit(execute(t->left, pin, pout, /* no_fork: */ 1)); |
2538 | } |
2539 | interactive = hinteractive; |
2540 | if (i != -1) { |
2541 | setval(lookup("!"), putn(i)); |
2542 | closepipe(pin); |
2543 | if (interactive) { |
2544 | prs(putn(i)); |
2545 | prs("\n"); |
2546 | } |
2547 | } else |
2548 | rv = -1; |
2549 | setstatus(rv); |
2550 | } |
2551 | break; |
2552 | |
2553 | case TOR: |
2554 | case TAND: |
2555 | rv = execute(t->left, pin, pout, /* no_fork: */ 0); |
2556 | t1 = t->right; |
2557 | if (t1 != NULL && (rv == 0) == (t->op_type == TAND)) |
2558 | rv = execute(t1, pin, pout, /* no_fork: */ 0); |
2559 | break; |
2560 | |
2561 | case TFOR: |
2562 | if (wp == NULL) { |
2563 | wp = dolv + 1; |
2564 | i = dolc; |
2565 | if (i < 0) |
2566 | i = 0; |
2567 | } else { |
2568 | i = -1; |
2569 | while (*wp++ != NULL) |
2570 | continue; |
2571 | } |
2572 | vp = lookup(t->str); |
2573 | while (setjmp(bc.brkpt)) |
2574 | if (isbreak) |
2575 | goto broken; |
2576 | /* Restore areanum value. It may be incremented by execute() |
2577 | * below, and then "continue" may jump back to setjmp above */ |
2578 | areanum = a + 1; |
2579 | freearea(areanum + 1); |
2580 | brkset(&bc); |
2581 | for (t1 = t->left; i-- && *wp != NULL;) { |
2582 | setval(vp, *wp++); |
2583 | rv = execute(t1, pin, pout, /* no_fork: */ 0); |
2584 | } |
2585 | brklist = brklist->nextlev; |
2586 | break; |
2587 | |
2588 | case TWHILE: |
2589 | case TUNTIL: |
2590 | while (setjmp(bc.brkpt)) |
2591 | if (isbreak) |
2592 | goto broken; |
2593 | /* Restore areanum value. It may be incremented by execute() |
2594 | * below, and then "continue" may jump back to setjmp above */ |
2595 | areanum = a + 1; |
2596 | freearea(areanum + 1); |
2597 | brkset(&bc); |
2598 | t1 = t->left; |
2599 | while ((execute(t1, pin, pout, /* no_fork: */ 0) == 0) == (t->op_type == TWHILE)) |
2600 | rv = execute(t->right, pin, pout, /* no_fork: */ 0); |
2601 | brklist = brklist->nextlev; |
2602 | break; |
2603 | |
2604 | case TIF: |
2605 | case TELIF: |
2606 | if (t->right != NULL) { |
2607 | rv = !execute(t->left, pin, pout, /* no_fork: */ 0) ? |
2608 | execute(t->right->left, pin, pout, /* no_fork: */ 0) : |
2609 | execute(t->right->right, pin, pout, /* no_fork: */ 0); |
2610 | } |
2611 | break; |
2612 | |
2613 | case TCASE: |
2614 | cp = evalstr(t->str, DOSUB | DOTRIM); |
2615 | if (cp == NULL) |
2616 | cp = ""; |
2617 | |
2618 | DBGPRINTF7(("EXECUTE: TCASE, t->str is %s, cp is %s\n", |
2619 | ((t->str == NULL) ? "NULL" : t->str), |
2620 | ((cp == NULL) ? "NULL" : cp))); |
2621 | |
2622 | t1 = findcase(t->left, cp); |
2623 | if (t1 != NULL) { |
2624 | DBGPRINTF7(("EXECUTE: TCASE, calling execute(t=%p, t1=%p)...\n", t, t1)); |
2625 | rv = execute(t1, pin, pout, /* no_fork: */ 0); |
2626 | DBGPRINTF7(("EXECUTE: TCASE, back from execute(t=%p, t1=%p)...\n", t, t1)); |
2627 | } |
2628 | break; |
2629 | |
2630 | case TBRACE: |
2631 | /* |
2632 | iopp = t->ioact; |
2633 | if (i) |
2634 | while (*iopp) |
2635 | if (iosetup(*iopp++, pin!=NULL, pout!=NULL)) { |
2636 | rv = -1; |
2637 | break; |
2638 | } |
2639 | */ |
2640 | if (rv >= 0) { |
2641 | t1 = t->left; |
2642 | if (t1) { |
2643 | rv = execute(t1, pin, pout, /* no_fork: */ 0); |
2644 | } |
2645 | } |
2646 | break; |
2647 | |
2648 | }; |
2649 | |
2650 | broken: |
2651 | // Restoring op_words is most likely not needed now: see comment in forkexec() |
2652 | // (also take a look at exec builtin (doexec) - it touches t->op_words) |
2653 | t->op_words = wp2; |
2654 | isbreak = 0; |
2655 | freehere(areanum); |
2656 | freearea(areanum); |
2657 | areanum = a; |
2658 | if (interactive && intr) { |
2659 | closeall(); |
2660 | fail(); |
2661 | } |
2662 | |
2663 | i = trapset; |
2664 | if (i != 0) { |
2665 | trapset = 0; |
2666 | runtrap(i); |
2667 | } |
2668 | |
2669 | DBGPRINTF(("EXECUTE: returning from t=%p, rv=%d\n", t, rv)); |
2670 | return rv; |
2671 | } |
2672 | |
2673 | static builtin_func_ptr inbuilt(const char *s) |
2674 | { |
2675 | const struct builtincmd *bp; |
2676 | |
2677 | for (bp = builtincmds; bp->name; bp++) |
2678 | if (strcmp(bp->name, s) == 0) |
2679 | return bp->builtinfunc; |
2680 | return NULL; |
2681 | } |
2682 | |
2683 | static int forkexec(struct op *t, int *pin, int *pout, int no_fork, char **wp) |
2684 | { |
2685 | pid_t newpid; |
2686 | int i; |
2687 | builtin_func_ptr bltin = NULL; |
2688 | const char *bltin_name = NULL; |
2689 | const char *cp; |
2690 | struct ioword **iopp; |
2691 | int resetsig; |
2692 | char **owp; |
2693 | int forked; |
2694 | |
2695 | int *hpin = pin; |
2696 | int *hpout = pout; |
2697 | char *hwp; |
2698 | smallint hinteractive; |
2699 | smallint hintr; |
2700 | smallint hexecflg; |
2701 | struct brkcon *hbrklist; |
2702 | |
2703 | #if __GNUC__ |
2704 | /* Avoid longjmp clobbering */ |
2705 | (void) &pin; |
2706 | (void) &pout; |
2707 | (void) ℘ |
2708 | (void) &bltin; |
2709 | (void) &cp; |
2710 | (void) &resetsig; |
2711 | (void) &owp; |
2712 | #endif |
2713 | |
2714 | DBGPRINTF(("FORKEXEC: t=%p, pin %p, pout %p, no_fork %d\n", t, pin, |
2715 | pout, no_fork)); |
2716 | DBGPRINTF7(("FORKEXEC: t->op_words is %s\n", |
2717 | ((t->op_words == NULL) ? "NULL" : t->op_words[0]))); |
2718 | owp = wp; |
2719 | resetsig = 0; |
2720 | if (t->op_type == TCOM) { |
2721 | while (*wp++ != NULL) |
2722 | continue; |
2723 | cp = *wp; |
2724 | |
2725 | /* strip all initial assignments */ |
2726 | /* FIXME: not correct wrt PATH=yyy command etc */ |
2727 | if (FLAG['x']) { |
2728 | DBGPRINTF9(("FORKEXEC: echo'ing, cp=%p, wp=%p, owp=%p\n", |
2729 | cp, wp, owp)); |
2730 | echo(cp ? wp : owp); |
2731 | } |
2732 | |
2733 | if (cp == NULL) { |
2734 | if (t->ioact == NULL) { |
2735 | while ((cp = *owp++) != NULL && assign(cp, COPYV)) |
2736 | continue; |
2737 | DBGPRINTF(("FORKEXEC: returning setstatus(0)\n")); |
2738 | return setstatus(0); |
2739 | } |
2740 | } else { /* cp != NULL */ |
2741 | bltin_name = cp; |
2742 | bltin = inbuilt(cp); |
2743 | } |
2744 | } |
2745 | |
2746 | forked = 0; |
2747 | // We were pointing t->op_words to temporary (expanded) arg list: |
2748 | // t->op_words = wp; |
2749 | // and restored it later (in execute()), but "break" |
2750 | // longjmps away (at "Run builtin" below), leaving t->op_words clobbered! |
2751 | // See http://bugs.busybox.net/view.php?id=846. |
2752 | // Now we do not touch t->op_words, but separately pass wp as param list |
2753 | // to builtins |
2754 | DBGPRINTF(("FORKEXEC: bltin %p, no_fork %d, owp %p\n", bltin, |
2755 | no_fork, owp)); |
2756 | /* Don't fork if it is a lone builtin (not in pipe) |
2757 | * OR we are told to _not_ fork */ |
2758 | if ((!bltin || pin || pout) /* not lone bltin AND */ |
2759 | && !no_fork /* not told to avoid fork */ |
2760 | ) { |
2761 | /* Save values in case child alters them after vfork */ |
2762 | hpin = pin; |
2763 | hpout = pout; |
2764 | hwp = *wp; |
2765 | hinteractive = interactive; |
2766 | hintr = intr; |
2767 | hbrklist = brklist; |
2768 | hexecflg = execflg; |
2769 | |
2770 | DBGPRINTF3(("FORKEXEC: calling vfork()...\n")); |
2771 | newpid = vfork(); |
2772 | if (newpid == -1) { |
2773 | DBGPRINTF(("FORKEXEC: ERROR, can't vfork()!\n")); |
2774 | return -1; |
2775 | } |
2776 | |
2777 | if (newpid > 0) { /* Parent */ |
2778 | /* Restore values */ |
2779 | pin = hpin; |
2780 | pout = hpout; |
2781 | *wp = hwp; |
2782 | interactive = hinteractive; |
2783 | intr = hintr; |
2784 | brklist = hbrklist; |
2785 | execflg = hexecflg; |
2786 | |
2787 | closepipe(pin); |
2788 | return (pout == NULL ? setstatus(waitfor(newpid, 0)) : 0); |
2789 | } |
2790 | |
2791 | /* Child */ |
2792 | DBGPRINTF(("FORKEXEC: child process, bltin=%p (%s)\n", bltin, bltin_name)); |
2793 | if (interactive) { |
2794 | signal(SIGINT, SIG_IGN); |
2795 | signal(SIGQUIT, SIG_IGN); |
2796 | resetsig = 1; |
2797 | } |
2798 | interactive = 0; |
2799 | intr = 0; |
2800 | forked = 1; |
2801 | brklist = 0; |
2802 | execflg = 0; |
2803 | } |
2804 | |
2805 | if (owp) |
2806 | while ((cp = *owp++) != NULL && assign(cp, COPYV)) |
2807 | if (!bltin) |
2808 | export(lookup(cp)); |
2809 | |
2810 | if (pin) { /* NB: close _first_, then move fds! */ |
2811 | close(pin[1]); |
2812 | xmove_fd(pin[0], 0); |
2813 | } |
2814 | if (pout) { |
2815 | close(pout[0]); |
2816 | xmove_fd(pout[1], 1); |
2817 | } |
2818 | |
2819 | iopp = t->ioact; |
2820 | if (iopp) { |
2821 | if (bltin && bltin != doexec) { |
2822 | prs(bltin_name); |
2823 | err(": can't redirect shell command"); |
2824 | if (forked) |
2825 | _exit(-1); |
2826 | return -1; |
2827 | } |
2828 | while (*iopp) { |
2829 | if (iosetup(*iopp++, pin != NULL, pout != NULL)) { |
2830 | /* system-detected error */ |
2831 | if (forked) |
2832 | _exit(-1); |
2833 | return -1; |
2834 | } |
2835 | } |
2836 | } |
2837 | |
2838 | if (bltin) { |
2839 | if (forked || pin || pout) { |
2840 | /* Builtin in pipe: disallowed */ |
2841 | /* TODO: allow "exec"? */ |
2842 | prs(bltin_name); |
2843 | err(": can't run builtin as part of pipe"); |
2844 | if (forked) |
2845 | _exit(-1); |
2846 | return -1; |
2847 | } |
2848 | /* Run builtin */ |
2849 | i = setstatus(bltin(t, wp)); |
2850 | if (forked) |
2851 | _exit(i); |
2852 | DBGPRINTF(("FORKEXEC: returning i=%d\n", i)); |
2853 | return i; |
2854 | } |
2855 | |
2856 | /* should use FIOCEXCL */ |
2857 | for (i = FDBASE; i < NOFILE; i++) |
2858 | close(i); |
2859 | if (resetsig) { |
2860 | signal(SIGINT, SIG_DFL); |
2861 | signal(SIGQUIT, SIG_DFL); |
2862 | } |
2863 | |
2864 | if (t->op_type == TPAREN) |
2865 | _exit(execute(t->left, NOPIPE, NOPIPE, /* no_fork: */ 1)); |
2866 | if (wp[0] == NULL) |
2867 | _exit(EXIT_SUCCESS); |
2868 | |
2869 | cp = rexecve(wp[0], wp, makenv(0, NULL)); |
2870 | prs(wp[0]); |
2871 | prs(": "); |
2872 | err(cp); |
2873 | if (!execflg) |
2874 | trap[0] = NULL; |
2875 | |
2876 | DBGPRINTF(("FORKEXEC: calling leave(), pid=%d\n", getpid())); |
2877 | |
2878 | leave(); |
2879 | /* NOTREACHED */ |
2880 | return 0; |
2881 | } |
2882 | |
2883 | /* |
2884 | * 0< 1> are ignored as required |
2885 | * within pipelines. |
2886 | */ |
2887 | static int iosetup(struct ioword *iop, int pipein, int pipeout) |
2888 | { |
2889 | int u = -1; |
2890 | char *cp = NULL; |
2891 | const char *msg; |
2892 | |
2893 | DBGPRINTF(("IOSETUP: iop %p, pipein %i, pipeout %i\n", iop, |
2894 | pipein, pipeout)); |
2895 | |
2896 | if (iop->io_fd == IODEFAULT) /* take default */ |
2897 | iop->io_fd = iop->io_flag & (IOREAD | IOHERE) ? 0 : 1; |
2898 | |
2899 | if (pipein && iop->io_fd == 0) |
2900 | return 0; |
2901 | |
2902 | if (pipeout && iop->io_fd == 1) |
2903 | return 0; |
2904 | |
2905 | msg = iop->io_flag & (IOREAD | IOHERE) ? "open" : "create"; |
2906 | if ((iop->io_flag & IOHERE) == 0) { |
2907 | cp = iop->io_name; /* huh?? */ |
2908 | cp = evalstr(cp, DOSUB | DOTRIM); |
2909 | if (cp == NULL) |
2910 | return 1; |
2911 | } |
2912 | |
2913 | if (iop->io_flag & IODUP) { |
2914 | if (cp[1] || (!isdigit(*cp) && *cp != '-')) { |
2915 | prs(cp); |
2916 | err(": illegal >& argument"); |
2917 | return 1; |
2918 | } |
2919 | if (*cp == '-') |
2920 | iop->io_flag = IOCLOSE; |
2921 | iop->io_flag &= ~(IOREAD | IOWRITE); |
2922 | } |
2923 | |
2924 | switch (iop->io_flag) { |
2925 | case IOREAD: |
2926 | u = open(cp, O_RDONLY); |
2927 | break; |
2928 | |
2929 | case IOHERE: |
2930 | case IOHERE | IOXHERE: |
2931 | u = herein(iop->io_name, iop->io_flag & IOXHERE); |
2932 | cp = (char*)"here file"; |
2933 | break; |
2934 | |
2935 | case IOWRITE | IOCAT: |
2936 | u = open(cp, O_WRONLY); |
2937 | if (u >= 0) { |
2938 | lseek(u, (long) 0, SEEK_END); |
2939 | break; |
2940 | } |
2941 | /* fall through to creation if >>file doesn't exist */ |
2942 | |
2943 | case IOWRITE: |
2944 | u = creat(cp, 0666); |
2945 | break; |
2946 | |
2947 | case IODUP: |
2948 | u = dup2(*cp - '0', iop->io_fd); |
2949 | break; |
2950 | |
2951 | case IOCLOSE: |
2952 | close(iop->io_fd); |
2953 | return 0; |
2954 | } |
2955 | |
2956 | if (u < 0) { |
2957 | prs(cp); |
2958 | prs(": can't "); |
2959 | warn(msg); |
2960 | return 1; |
2961 | } |
2962 | xmove_fd(u, iop->io_fd); |
2963 | return 0; |
2964 | } |
2965 | |
2966 | /* |
2967 | * Enter a new loop level (marked for break/continue). |
2968 | */ |
2969 | static void brkset(struct brkcon *bc) |
2970 | { |
2971 | bc->nextlev = brklist; |
2972 | brklist = bc; |
2973 | } |
2974 | |
2975 | /* |
2976 | * Wait for the last process created. |
2977 | * Print a message for each process found |
2978 | * that was killed by a signal. |
2979 | * Ignore interrupt signals while waiting |
2980 | * unless `canintr' is true. |
2981 | */ |
2982 | static int waitfor(int lastpid, int canintr) |
2983 | { |
2984 | int pid, rv; |
2985 | int s; |
2986 | smallint oheedint = heedint; |
2987 | |
2988 | heedint = 0; |
2989 | rv = 0; |
2990 | do { |
2991 | pid = wait(&s); |
2992 | if (pid == -1) { |
2993 | if (errno != EINTR || canintr) |
2994 | break; |
2995 | } else { |
2996 | rv = WAITSIG(s); |
2997 | if (rv != 0) { |
2998 | if (rv < ARRAY_SIZE(signame)) { |
2999 | if (signame[rv] != NULL) { |
3000 | if (pid != lastpid) { |
3001 | prn(pid); |
3002 | prs(": "); |
3003 | } |
3004 | prs(signame[rv]); |
3005 | } |
3006 | } else { |
3007 | if (pid != lastpid) { |
3008 | prn(pid); |
3009 | prs(": "); |
3010 | } |
3011 | prs("Signal "); |
3012 | prn(rv); |
3013 | prs(" "); |
3014 | } |
3015 | if (WAITCORE(s)) |
3016 | prs(" - core dumped"); |
3017 | if (rv >= ARRAY_SIZE(signame) || signame[rv]) |
3018 | prs("\n"); |
3019 | rv |= 0x80; |
3020 | } else |
3021 | rv = WAITVAL(s); |
3022 | } |
3023 | } while (pid != lastpid); |
3024 | heedint = oheedint; |
3025 | if (intr) { |
3026 | if (interactive) { |
3027 | if (canintr) |
3028 | intr = 0; |
3029 | } else { |
3030 | if (exstat == 0) |
3031 | exstat = rv; |
3032 | onintr(0); |
3033 | } |
3034 | } |
3035 | return rv; |
3036 | } |
3037 | |
3038 | static int setstatus(int s) |
3039 | { |
3040 | exstat = s; |
3041 | setval(lookup("?"), putn(s)); |
3042 | return s; |
3043 | } |
3044 | |
3045 | /* |
3046 | * PATH-searching interface to execve. |
3047 | * If getenv("PATH") were kept up-to-date, |
3048 | * execvp might be used. |
3049 | */ |
3050 | static const char *rexecve(char *c, char **v, char **envp) |
3051 | { |
3052 | const char *sp; |
3053 | char *tp; |
3054 | int asis = 0; |
3055 | char *name = c; |
3056 | |
3057 | if (ENABLE_FEATURE_SH_STANDALONE) { |
3058 | if (find_applet_by_name(name) >= 0) { |
3059 | /* We have to exec here since we vforked. Running |
3060 | * run_applet_and_exit() won't work and bad things |
3061 | * will happen. */ |
3062 | execve(bb_busybox_exec_path, v, envp); |
3063 | } |
3064 | } |
3065 | |
3066 | DBGPRINTF(("REXECVE: c=%p, v=%p, envp=%p\n", c, v, envp)); |
3067 | |
3068 | sp = any('/', c) ? "" : path->value; |
3069 | asis = (*sp == '\0'); |
3070 | while (asis || *sp != '\0') { |
3071 | asis = 0; |
3072 | tp = global_env.linep; |
3073 | for (; *sp != '\0'; tp++) { |
3074 | *tp = *sp++; |
3075 | if (*tp == ':') { |
3076 | asis = (*sp == '\0'); |
3077 | break; |
3078 | } |
3079 | } |
3080 | if (tp != global_env.linep) |
3081 | *tp++ = '/'; |
3082 | strcpy(tp, c); |
3083 | |
3084 | DBGPRINTF3(("REXECVE: global_env.linep is %s\n", global_env.linep)); |
3085 | |
3086 | execve(global_env.linep, v, envp); |
3087 | |
3088 | switch (errno) { |
3089 | case ENOEXEC: |
3090 | /* File is executable but file format isnt recognized */ |
3091 | /* Run it as a shell script */ |
3092 | /* (execve above didnt do it itself, unlike execvp) */ |
3093 | *v = global_env.linep; |
3094 | v--; |
3095 | tp = *v; |
3096 | *v = (char*)DEFAULT_SHELL; |
3097 | execve(DEFAULT_SHELL, v, envp); |
3098 | *v = tp; |
3099 | return "no shell"; |
3100 | |
3101 | case ENOMEM: |
3102 | return (char *) bb_msg_memory_exhausted; |
3103 | |
3104 | case E2BIG: |
3105 | return "argument list too long"; |
3106 | } |
3107 | } |
3108 | if (errno == ENOENT) { |
3109 | exstat = 127; /* standards require this */ |
3110 | return "not found"; |
3111 | } |
3112 | exstat = 126; /* mimic bash */ |
3113 | return "can't execute"; |
3114 | } |
3115 | |
3116 | /* |
3117 | * Run the command produced by generator `f' |
3118 | * applied to stream `arg'. |
3119 | */ |
3120 | static int run(struct ioarg *argp, int (*f) (struct ioarg *)) |
3121 | { |
3122 | struct op *otree; |
3123 | struct wdblock *swdlist; |
3124 | struct wdblock *siolist; |
3125 | jmp_buf ev, rt; |
3126 | xint *ofail; |
3127 | int rv; |
3128 | |
3129 | #if __GNUC__ |
3130 | /* Avoid longjmp clobbering */ |
3131 | (void) &rv; |
3132 | #endif |
3133 | |
3134 | DBGPRINTF(("RUN: enter, areanum %d, outtree %p, failpt %p\n", |
3135 | areanum, outtree, failpt)); |
3136 | |
3137 | areanum++; |
3138 | swdlist = wdlist; |
3139 | siolist = iolist; |
3140 | otree = outtree; |
3141 | ofail = failpt; |
3142 | rv = -1; |
3143 | |
3144 | errpt = ev; |
3145 | if (newenv(setjmp(errpt)) == 0) { |
3146 | wdlist = NULL; |
3147 | iolist = NULL; |
3148 | pushio(argp, f); |
3149 | global_env.iobase = global_env.iop; |
3150 | yynerrs = 0; |
3151 | failpt = rt; |
3152 | if (setjmp(failpt) == 0 && yyparse() == 0) |
3153 | rv = execute(outtree, NOPIPE, NOPIPE, /* no_fork: */ 0); |
3154 | quitenv(); |
3155 | } else { |
3156 | DBGPRINTF(("RUN: error from newenv()!\n")); |
3157 | } |
3158 | |
3159 | wdlist = swdlist; |
3160 | iolist = siolist; |
3161 | failpt = ofail; |
3162 | outtree = otree; |
3163 | freearea(areanum--); |
3164 | |
3165 | return rv; |
3166 | } |
3167 | |
3168 | /* -------- do.c -------- */ |
3169 | |
3170 | /* |
3171 | * built-in commands: doX |
3172 | */ |
3173 | |
3174 | static int dohelp(struct op *t UNUSED_PARAM, char **args UNUSED_PARAM) |
3175 | { |
3176 | int col; |
3177 | const struct builtincmd *x; |
3178 | |
3179 | puts("\nBuilt-in commands:\n" |
3180 | "-------------------"); |
3181 | |
3182 | col = 0; |
3183 | x = builtincmds; |
3184 | while (x->name) { |
3185 | col += printf("%c%s", ((col == 0) ? '\t' : ' '), x->name); |
3186 | if (col > 60) { |
3187 | bb_putchar('\n'); |
3188 | col = 0; |
3189 | } |
3190 | x++; |
3191 | } |
3192 | #if ENABLE_FEATURE_SH_STANDALONE |
3193 | { |
3194 | const char *applet = applet_names; |
3195 | |
3196 | while (*applet) { |
3197 | col += printf("%c%s", ((col == 0) ? '\t' : ' '), applet); |
3198 | if (col > 60) { |
3199 | bb_putchar('\n'); |
3200 | col = 0; |
3201 | } |
3202 | applet += strlen(applet) + 1; |
3203 | } |
3204 | } |
3205 | #endif |
3206 | puts("\n"); |
3207 | return EXIT_SUCCESS; |
3208 | } |
3209 | |
3210 | static int dolabel(struct op *t UNUSED_PARAM, char **args UNUSED_PARAM) |
3211 | { |
3212 | return 0; |
3213 | } |
3214 | |
3215 | static int dochdir(struct op *t UNUSED_PARAM, char **args) |
3216 | { |
3217 | const char *cp, *er; |
3218 | |
3219 | cp = args[1]; |
3220 | if (cp == NULL) { |
3221 | cp = homedir->value; |
3222 | if (cp != NULL) |
3223 | goto do_cd; |
3224 | er = ": no home directory"; |
3225 | } else { |
3226 | do_cd: |
3227 | if (chdir(cp) >= 0) |
3228 | return 0; |
3229 | er = ": bad directory"; |
3230 | } |
3231 | prs(cp != NULL ? cp : "cd"); |
3232 | err(er); |
3233 | return 1; |
3234 | } |
3235 | |
3236 | static int doshift(struct op *t UNUSED_PARAM, char **args) |
3237 | { |
3238 | int n; |
3239 | |
3240 | n = args[1] ? getn(args[1]) : 1; |
3241 | if (dolc < n) { |
3242 | err("nothing to shift"); |
3243 | return 1; |
3244 | } |
3245 | dolv[n] = dolv[0]; |
3246 | dolv += n; |
3247 | dolc -= n; |
3248 | setval(lookup("#"), putn(dolc)); |
3249 | return 0; |
3250 | } |
3251 | |
3252 | /* |
3253 | * execute login and newgrp directly |
3254 | */ |
3255 | static int dologin(struct op *t UNUSED_PARAM, char **args) |
3256 | { |
3257 | const char *cp; |
3258 | |
3259 | if (interactive) { |
3260 | signal(SIGINT, SIG_DFL); |
3261 | signal(SIGQUIT, SIG_DFL); |
3262 | } |
3263 | cp = rexecve(args[0], args, makenv(0, NULL)); |
3264 | prs(args[0]); |
3265 | prs(": "); |
3266 | err(cp); |
3267 | return 1; |
3268 | } |
3269 | |
3270 | static int doumask(struct op *t UNUSED_PARAM, char **args) |
3271 | { |
3272 | int i; |
3273 | char *cp; |
3274 | |
3275 | cp = args[1]; |
3276 | if (cp == NULL) { |
3277 | i = umask(0); |
3278 | umask(i); |
3279 | printf("%04o\n", i); |
3280 | } else { |
3281 | i = bb_strtou(cp, NULL, 8); |
3282 | if (errno) { |
3283 | err("umask: bad octal number"); |
3284 | return 1; |
3285 | } |
3286 | umask(i); |
3287 | } |
3288 | return 0; |
3289 | } |
3290 | |
3291 | static int doexec(struct op *t, char **args) |
3292 | { |
3293 | jmp_buf ex; |
3294 | xint *ofail; |
3295 | char **sv_words; |
3296 | |
3297 | t->ioact = NULL; |
3298 | if (!args[1]) |
3299 | return 1; |
3300 | |
3301 | execflg = 1; |
3302 | ofail = failpt; |
3303 | failpt = ex; |
3304 | |
3305 | sv_words = t->op_words; |
3306 | t->op_words = args + 1; |
3307 | // TODO: test what will happen with "exec break" - |
3308 | // will it leave t->op_words pointing to garbage? |
3309 | // (see http://bugs.busybox.net/view.php?id=846) |
3310 | if (setjmp(failpt) == 0) |
3311 | execute(t, NOPIPE, NOPIPE, /* no_fork: */ 1); |
3312 | t->op_words = sv_words; |
3313 | |
3314 | failpt = ofail; |
3315 | execflg = 0; |
3316 | |
3317 | return 1; |
3318 | } |
3319 | |
3320 | static int dodot(struct op *t UNUSED_PARAM, char **args) |
3321 | { |
3322 | int i; |
3323 | const char *sp; |
3324 | char *tp; |
3325 | char *cp; |
3326 | int maltmp; |
3327 | |
3328 | DBGPRINTF(("DODOT: enter, t=%p, tleft %p, tright %p, global_env.linep is %s\n", |
3329 | t, t->left, t->right, ((global_env.linep == NULL) ? "NULL" : global_env.linep))); |
3330 | |
3331 | cp = args[1]; |
3332 | if (cp == NULL) { |
3333 | DBGPRINTF(("DODOT: bad args, ret 0\n")); |
3334 | return 0; |
3335 | } |
3336 | DBGPRINTF(("DODOT: cp is %s\n", cp)); |
3337 | |
3338 | sp = any('/', cp) ? ":" : path->value; |
3339 | |
3340 | DBGPRINTF(("DODOT: sp is %s, global_env.linep is %s\n", |
3341 | ((sp == NULL) ? "NULL" : sp), |
3342 | ((global_env.linep == NULL) ? "NULL" : global_env.linep))); |
3343 | |
3344 | while (*sp) { |
3345 | tp = global_env.linep; |
3346 | while (*sp && (*tp = *sp++) != ':') |
3347 | tp++; |
3348 | if (tp != global_env.linep) |
3349 | *tp++ = '/'; |
3350 | strcpy(tp, cp); |
3351 | |
3352 | /* Original code */ |
3353 | i = open(global_env.linep, O_RDONLY); |
3354 | if (i >= 0) { |
3355 | exstat = 0; |
3356 | maltmp = remap(i); |
3357 | DBGPRINTF(("DODOT: remap=%d, exstat=%d, global_env.iofd %d, i %d, global_env.linep is %s\n", |
3358 | maltmp, exstat, global_env.iofd, i, global_env.linep)); |
3359 | |
3360 | next(maltmp); /* Basically a PUSHIO */ |
3361 | |
3362 | DBGPRINTF(("DODOT: returning exstat=%d\n", exstat)); |
3363 | |
3364 | return exstat; |
3365 | } |
3366 | } /* while */ |
3367 | |
3368 | prs(cp); |
3369 | err(": not found"); |
3370 | |
3371 | return -1; |
3372 | } |
3373 | |
3374 | static int dowait(struct op *t UNUSED_PARAM, char **args) |
3375 | { |
3376 | int i; |
3377 | char *cp; |
3378 | |
3379 | cp = args[1]; |
3380 | if (cp != NULL) { |
3381 | i = getn(cp); |
3382 | if (i == 0) |
3383 | return 0; |
3384 | } else |
3385 | i = -1; |
3386 | setstatus(waitfor(i, 1)); |
3387 | return 0; |
3388 | } |
3389 | |
3390 | static int doread(struct op *t UNUSED_PARAM, char **args) |
3391 | { |
3392 | char *cp, **wp; |
3393 | int nb = 0; |
3394 | int nl = 0; |
3395 | |
3396 | if (args[1] == NULL) { |
3397 | err("Usage: read name ..."); |
3398 | return 1; |
3399 | } |
3400 | for (wp = args + 1; *wp; wp++) { |
3401 | for (cp = global_env.linep; !nl && cp < elinep - 1; cp++) { |
3402 | nb = nonblock_safe_read(STDIN_FILENO, cp, sizeof(*cp)); |
3403 | if (nb != sizeof(*cp)) |
3404 | break; |
3405 | nl = (*cp == '\n'); |
3406 | if (nl || (wp[1] && any(*cp, ifs->value))) |
3407 | break; |
3408 | } |
3409 | *cp = '\0'; |
3410 | if (nb <= 0) |
3411 | break; |
3412 | setval(lookup(*wp), global_env.linep); |
3413 | } |
3414 | return nb <= 0; |
3415 | } |
3416 | |
3417 | static int doeval(struct op *t UNUSED_PARAM, char **args) |
3418 | { |
3419 | return RUN(awordlist, args + 1, wdchar); |
3420 | } |
3421 | |
3422 | static int dotrap(struct op *t UNUSED_PARAM, char **args) |
3423 | { |
3424 | int n, i; |
3425 | int resetsig; |
3426 | |
3427 | if (args[1] == NULL) { |
3428 | for (i = 0; i <= _NSIG; i++) |
3429 | if (trap[i]) { |
3430 | prn(i); |
3431 | prs(": "); |
3432 | prs(trap[i]); |
3433 | prs("\n"); |
3434 | } |
3435 | return 0; |
3436 | } |
3437 | resetsig = isdigit(args[1][0]); |
3438 | for (i = resetsig ? 1 : 2; args[i] != NULL; ++i) { |
3439 | n = getsig(args[i]); |
3440 | freecell(trap[n]); |
3441 | trap[n] = 0; |
3442 | if (!resetsig) { |
3443 | if (args[1][0] != '\0') { |
3444 | trap[n] = strsave(args[1], 0); |
3445 | setsig(n, sig); |
3446 | } else |
3447 | setsig(n, SIG_IGN); |
3448 | } else { |
3449 | if (interactive) { |
3450 | if (n == SIGINT) |
3451 | setsig(n, onintr); |
3452 | else |
3453 | setsig(n, n == SIGQUIT ? SIG_IGN : SIG_DFL); |
3454 | } else |
3455 | setsig(n, SIG_DFL); |
3456 | } |
3457 | } |
3458 | return 0; |
3459 | } |
3460 | |
3461 | static int getsig(char *s) |
3462 | { |
3463 | int n; |
3464 | |
3465 | n = getn(s); |
3466 | if (n < 0 || n > _NSIG) { |
3467 | err("trap: bad signal number"); |
3468 | n = 0; |
3469 | } |
3470 | return n; |
3471 | } |
3472 | |
3473 | static void setsig(int n, sighandler_t f) |
3474 | { |
3475 | if (n == 0) |
3476 | return; |
3477 | if (signal(n, SIG_IGN) != SIG_IGN || ourtrap[n]) { |
3478 | ourtrap[n] = 1; |
3479 | signal(n, f); |
3480 | } |
3481 | } |
3482 | |
3483 | static int getn(char *as) |
3484 | { |
3485 | char *s; |
3486 | int n, m; |
3487 | |
3488 | s = as; |
3489 | m = 1; |
3490 | if (*s == '-') { |
3491 | m = -1; |
3492 | s++; |
3493 | } |
3494 | for (n = 0; isdigit(*s); s++) |
3495 | n = (n * 10) + (*s - '0'); |
3496 | if (*s) { |
3497 | prs(as); |
3498 | err(": bad number"); |
3499 | } |
3500 | return n * m; |
3501 | } |
3502 | |
3503 | static int dobreak(struct op *t UNUSED_PARAM, char **args) |
3504 | { |
3505 | return brkcontin(args[1], 1); |
3506 | } |
3507 | |
3508 | static int docontinue(struct op *t UNUSED_PARAM, char **args) |
3509 | { |
3510 | return brkcontin(args[1], 0); |
3511 | } |
3512 | |
3513 | static int brkcontin(char *cp, int val) |
3514 | { |
3515 | struct brkcon *bc; |
3516 | int nl; |
3517 | |
3518 | nl = cp == NULL ? 1 : getn(cp); |
3519 | if (nl <= 0) |
3520 | nl = 999; |
3521 | do { |
3522 | bc = brklist; |
3523 | if (bc == NULL) |
3524 | break; |
3525 | brklist = bc->nextlev; |
3526 | } while (--nl); |
3527 | if (nl) { |
3528 | err("bad break/continue level"); |
3529 | return 1; |
3530 | } |
3531 | isbreak = (val != 0); |
3532 | longjmp(bc->brkpt, 1); |
3533 | /* NOTREACHED */ |
3534 | } |
3535 | |
3536 | static int doexit(struct op *t UNUSED_PARAM, char **args) |
3537 | { |
3538 | char *cp; |
3539 | |
3540 | execflg = 0; |
3541 | cp = args[1]; |
3542 | if (cp != NULL) |
3543 | setstatus(getn(cp)); |
3544 | |
3545 | DBGPRINTF(("DOEXIT: calling leave(), t=%p\n", t)); |
3546 | |
3547 | leave(); |
3548 | /* NOTREACHED */ |
3549 | return 0; |
3550 | } |
3551 | |
3552 | static int doexport(struct op *t UNUSED_PARAM, char **args) |
3553 | { |
3554 | rdexp(args + 1, export, EXPORT); |
3555 | return 0; |
3556 | } |
3557 | |
3558 | static int doreadonly(struct op *t UNUSED_PARAM, char **args) |
3559 | { |
3560 | rdexp(args + 1, ronly, RONLY); |
3561 | return 0; |
3562 | } |
3563 | |
3564 | static void rdexp(char **wp, void (*f) (struct var *), int key) |
3565 | { |
3566 | DBGPRINTF6(("RDEXP: enter, wp=%p, func=%p, key=%d\n", wp, f, key)); |
3567 | DBGPRINTF6(("RDEXP: *wp=%s\n", *wp)); |
3568 | |
3569 | if (*wp != NULL) { |
3570 | for (; *wp != NULL; wp++) { |
3571 | if (isassign(*wp)) { |
3572 | char *cp; |
3573 | |
3574 | assign(*wp, COPYV); |
3575 | for (cp = *wp; *cp != '='; cp++) |
3576 | continue; |
3577 | *cp = '\0'; |
3578 | } |
3579 | if (checkname(*wp)) |
3580 | (*f) (lookup(*wp)); |
3581 | else |
3582 | badid(*wp); |
3583 | } |
3584 | } else |
3585 | putvlist(key, 1); |
3586 | } |
3587 | |
3588 | static void badid(char *s) |
3589 | { |
3590 | prs(s); |
3591 | err(": bad identifier"); |
3592 | } |
3593 | |
3594 | static int doset(struct op *t UNUSED_PARAM, char **args) |
3595 | { |
3596 | struct var *vp; |
3597 | char *cp; |
3598 | int n; |
3599 | |
3600 | cp = args[1]; |
3601 | if (cp == NULL) { |
3602 | for (vp = vlist; vp; vp = vp->next) |
3603 | varput(vp->name, 1); |
3604 | return 0; |
3605 | } |
3606 | if (*cp == '-') { |
3607 | args++; |
3608 | if (*++cp == 0) |
3609 | FLAG['x'] = FLAG['v'] = 0; |
3610 | else { |
3611 | for (; *cp; cp++) { |
3612 | switch (*cp) { |
3613 | case 'e': |
3614 | if (!interactive) |
3615 | FLAG['e']++; |
3616 | break; |
3617 | |
3618 | default: |
3619 | if (*cp >= 'a' && *cp <= 'z') |
3620 | FLAG[(int) *cp]++; |
3621 | break; |
3622 | } |
3623 | } |
3624 | } |
3625 | setdash(); |
3626 | } |
3627 | if (args[1]) { |
3628 | args[0] = dolv[0]; |
3629 | for (n = 1; args[n]; n++) |
3630 | setarea((char *) args[n], 0); |
3631 | dolc = n - 1; |
3632 | dolv = args; |
3633 | setval(lookup("#"), putn(dolc)); |
3634 | setarea((char *) (dolv - 1), 0); |
3635 | } |
3636 | return 0; |
3637 | } |
3638 | |
3639 | static void varput(char *s, int out) |
3640 | { |
3641 | if (isalnum(*s) || *s == '_') { |
3642 | write(out, s, strlen(s)); |
3643 | write(out, "\n", 1); |
3644 | } |
3645 | } |
3646 | |
3647 | |
3648 | /* |
3649 | * Copyright (c) 1999 Herbert Xu <herbert@debian.org> |
3650 | * This file contains code for the times builtin. |
3651 | */ |
3652 | static void times_fmt(char *buf, clock_t val, unsigned clk_tck) |
3653 | { |
3654 | unsigned min, sec; |
3655 | if (sizeof(val) > sizeof(int)) |
3656 | sec = ((unsigned long)val) / clk_tck; |
3657 | else |
3658 | sec = ((unsigned)val) / clk_tck; |
3659 | min = sec / 60; |
3660 | #if ENABLE_DESKTOP |
3661 | sprintf(buf, "%um%u.%03us", min, (sec - min * 60), |
3662 | /* msec: */ ((unsigned)(val - (clock_t)sec * clk_tck)) * 1000 / clk_tck |
3663 | ); |
3664 | #else |
3665 | sprintf(buf, "%um%us", min, (sec - min * 60)); |
3666 | #endif |
3667 | } |
3668 | |
3669 | static int dotimes(struct op *t UNUSED_PARAM, char **args UNUSED_PARAM) |
3670 | { |
3671 | struct tms buf; |
3672 | unsigned clk_tck = sysconf(_SC_CLK_TCK); |
3673 | /* How much do we need for "NmN.NNNs" ? */ |
3674 | enum { TIMEBUF_SIZE = sizeof(int)*3 + sizeof(int)*3 + 6 }; |
3675 | char u[TIMEBUF_SIZE], s[TIMEBUF_SIZE]; |
3676 | char cu[TIMEBUF_SIZE], cs[TIMEBUF_SIZE]; |
3677 | |
3678 | times(&buf); |
3679 | |
3680 | times_fmt(u, buf.tms_utime, clk_tck); |
3681 | times_fmt(s, buf.tms_stime, clk_tck); |
3682 | times_fmt(cu, buf.tms_cutime, clk_tck); |
3683 | times_fmt(cs, buf.tms_cstime, clk_tck); |
3684 | |
3685 | printf("%s %s\n%s %s\n", u, s, cu, cs); |
3686 | return 0; |
3687 | } |
3688 | |
3689 | |
3690 | /* -------- eval.c -------- */ |
3691 | |
3692 | /* |
3693 | * ${} |
3694 | * `command` |
3695 | * blank interpretation |
3696 | * quoting |
3697 | * glob |
3698 | */ |
3699 | |
3700 | static char **eval(char **ap, int f) |
3701 | { |
3702 | struct wdblock *wb; |
3703 | char **wp; |
3704 | char **wf; |
3705 | jmp_buf ev; |
3706 | |
3707 | #if __GNUC__ |
3708 | /* Avoid longjmp clobbering */ |
3709 | (void) ℘ |
3710 | (void) ≈ |
3711 | #endif |
3712 | |
3713 | DBGPRINTF4(("EVAL: enter, f=%d\n", f)); |
3714 | |
3715 | wp = NULL; |
3716 | wb = NULL; |
3717 | wf = NULL; |
3718 | errpt = ev; |
3719 | if (newenv(setjmp(errpt)) == 0) { |
3720 | while (*ap && isassign(*ap)) |
3721 | expand(*ap++, &wb, f & ~DOGLOB); |
3722 | if (FLAG['k']) { |
3723 | for (wf = ap; *wf; wf++) { |
3724 | if (isassign(*wf)) |
3725 | expand(*wf, &wb, f & ~DOGLOB); |
3726 | } |
3727 | } |
3728 | for (wb = addword((char *) NULL, wb); *ap; ap++) { |
3729 | if (!FLAG['k'] || !isassign(*ap)) |
3730 | expand(*ap, &wb, f & ~DOKEY); |
3731 | } |
3732 | wb = addword((char *) 0, wb); |
3733 | wp = getwords(wb); |
3734 | quitenv(); |
3735 | } else |
3736 | gflg = 1; |
3737 | |
3738 | return gflg ? (char **) NULL : wp; |
3739 | } |
3740 | |
3741 | |
3742 | /* |
3743 | * Make the exported environment from the exported |
3744 | * names in the dictionary. Keyword assignments |
3745 | * will already have been done. |
3746 | */ |
3747 | static char **makenv(int all, struct wdblock *wb) |
3748 | { |
3749 | struct var *vp; |
3750 | |
3751 | DBGPRINTF5(("MAKENV: enter, all=%d\n", all)); |
3752 | |
3753 | for (vp = vlist; vp; vp = vp->next) |
3754 | if (all || vp->status & EXPORT) |
3755 | wb = addword(vp->name, wb); |
3756 | wb = addword((char *) 0, wb); |
3757 | return getwords(wb); |
3758 | } |
3759 | |
3760 | static int expand(const char *cp, struct wdblock **wbp, int f) |
3761 | { |
3762 | jmp_buf ev; |
3763 | char *xp; |
3764 | |
3765 | #if __GNUC__ |
3766 | /* Avoid longjmp clobbering */ |
3767 | (void) &cp; |
3768 | #endif |
3769 | |
3770 | DBGPRINTF3(("EXPAND: enter, f=%d\n", f)); |
3771 | |
3772 | gflg = 0; |
3773 | |
3774 | if (cp == NULL) |
3775 | return 0; |
3776 | |
3777 | if (!anys("$`'\"", cp) && !anys(ifs->value, cp) |
3778 | && ((f & DOGLOB) == 0 || !anys("[*?", cp)) |
3779 | ) { |
3780 | xp = strsave(cp, areanum); |
3781 | if (f & DOTRIM) |
3782 | unquote(xp); |
3783 | *wbp = addword(xp, *wbp); |
3784 | return 1; |
3785 | } |
3786 | errpt = ev; |
3787 | if (newenv(setjmp(errpt)) == 0) { |
3788 | PUSHIO(aword, cp, strchar); |
3789 | global_env.iobase = global_env.iop; |
3790 | while ((xp = blank(f)) && gflg == 0) { |
3791 | global_env.linep = xp; |
3792 | xp = strsave(xp, areanum); |
3793 | if ((f & DOGLOB) == 0) { |
3794 | if (f & DOTRIM) |
3795 | unquote(xp); |
3796 | *wbp = addword(xp, *wbp); |
3797 | } else |
3798 | *wbp = glob(xp, *wbp); |
3799 | } |
3800 | quitenv(); |
3801 | } else |
3802 | gflg = 1; |
3803 | return gflg == 0; |
3804 | } |
3805 | |
3806 | static char *evalstr(char *cp, int f) |
3807 | { |
3808 | struct wdblock *wb; |
3809 | |
3810 | DBGPRINTF6(("EVALSTR: enter, cp=%p, f=%d\n", cp, f)); |
3811 | |
3812 | wb = NULL; |
3813 | if (expand(cp, &wb, f)) { |
3814 | if (wb == NULL || wb->w_nword == 0 |
3815 | || (cp = wb->w_words[0]) == NULL |
3816 | ) { |
3817 | // TODO: I suspect that |
3818 | // char *evalstr(char *cp, int f) is actually |
3819 | // const char *evalstr(const char *cp, int f)! |
3820 | cp = (char*)""; |
3821 | } |
3822 | DELETE(wb); |
3823 | } else |
3824 | cp = NULL; |
3825 | return cp; |
3826 | } |
3827 | |
3828 | |
3829 | /* |
3830 | * Blank interpretation and quoting |
3831 | */ |
3832 | static char *blank(int f) |
3833 | { |
3834 | int c, c1; |
3835 | char *sp; |
3836 | int scanequals, foundequals; |
3837 | |
3838 | DBGPRINTF3(("BLANK: enter, f=%d\n", f)); |
3839 | |
3840 | sp = global_env.linep; |
3841 | scanequals = f & DOKEY; |
3842 | foundequals = 0; |
3843 | |
3844 | loop: |
3845 | c = subgetc('"', foundequals); |
3846 | switch (c) { |
3847 | case 0: |
3848 | if (sp == global_env.linep) |
3849 | return 0; |
3850 | *global_env.linep++ = 0; |
3851 | return sp; |
3852 | |
3853 | default: |
3854 | if (f & DOBLANK && any(c, ifs->value)) |
3855 | goto loop; |
3856 | break; |
3857 | |
3858 | case '"': |
3859 | case '\'': |
3860 | scanequals = 0; |
3861 | if (INSUB()) |
3862 | break; |
3863 | for (c1 = c; (c = subgetc(c1, 1)) != c1;) { |
3864 | if (c == 0) |
3865 | break; |
3866 | if (c == '\'' || !any(c, "$`\"")) |
3867 | c |= QUOTE; |
3868 | *global_env.linep++ = c; |
3869 | } |
3870 | c = 0; |
3871 | } |
3872 | unget(c); |
3873 | if (!isalpha(c) && c != '_') |
3874 | scanequals = 0; |
3875 | for (;;) { |
3876 | c = subgetc('"', foundequals); |
3877 | if (c == 0 || |
3878 | f & (DOBLANK && any(c, ifs->value)) || |
3879 | (!INSUB() && any(c, "\"'"))) { |
3880 | scanequals = 0; |
3881 | unget(c); |
3882 | if (any(c, "\"'")) |
3883 | goto loop; |
3884 | break; |
3885 | } |
3886 | if (scanequals) { |
3887 | if (c == '=') { |
3888 | foundequals = 1; |
3889 | scanequals = 0; |
3890 | } else if (!isalnum(c) && c != '_') |
3891 | scanequals = 0; |
3892 | } |
3893 | *global_env.linep++ = c; |
3894 | } |
3895 | *global_env.linep++ = 0; |
3896 | return sp; |
3897 | } |
3898 | |
3899 | /* |
3900 | * Get characters, substituting for ` and $ |
3901 | */ |
3902 | static int subgetc(char ec, int quoted) |
3903 | { |
3904 | char c; |
3905 | |
3906 | DBGPRINTF3(("SUBGETC: enter, quoted=%d\n", quoted)); |
3907 | |
3908 | again: |
3909 | c = my_getc(ec); |
3910 | if (!INSUB() && ec != '\'') { |
3911 | if (c == '`') { |
3912 | if (grave(quoted) == 0) |
3913 | return 0; |
3914 | global_env.iop->task = XGRAVE; |
3915 | goto again; |
3916 | } |
3917 | if (c == '$') { |
3918 | c = dollar(quoted); |
3919 | if (c == 0) { |
3920 | global_env.iop->task = XDOLL; |
3921 | goto again; |
3922 | } |
3923 | } |
3924 | } |
3925 | return c; |
3926 | } |
3927 | |
3928 | /* |
3929 | * Prepare to generate the string returned by ${} substitution. |
3930 | */ |
3931 | static int dollar(int quoted) |
3932 | { |
3933 | int otask; |
3934 | struct io *oiop; |
3935 | char *dolp; |
3936 | char *s, c, *cp = NULL; |
3937 | struct var *vp; |
3938 | |
3939 | DBGPRINTF3(("DOLLAR: enter, quoted=%d\n", quoted)); |
3940 | |
3941 | c = readc(); |
3942 | s = global_env.linep; |
3943 | if (c != '{') { |
3944 | *global_env.linep++ = c; |
3945 | if (isalpha(c) || c == '_') { |
3946 | while ((c = readc()) != 0 && (isalnum(c) || c == '_')) |
3947 | if (global_env.linep < elinep) |
3948 | *global_env.linep++ = c; |
3949 | unget(c); |
3950 | } |
3951 | c = 0; |
3952 | } else { |
3953 | oiop = global_env.iop; |
3954 | otask = global_env.iop->task; |
3955 | |
3956 | global_env.iop->task = XOTHER; |
3957 | while ((c = subgetc('"', 0)) != 0 && c != '}' && c != '\n') |
3958 | if (global_env.linep < elinep) |
3959 | *global_env.linep++ = c; |
3960 | if (oiop == global_env.iop) |
3961 | global_env.iop->task = otask; |
3962 | if (c != '}') { |
3963 | err("unclosed ${"); |
3964 | gflg = 1; |
3965 | return c; |
3966 | } |
3967 | } |
3968 | if (global_env.linep >= elinep) { |
3969 | err("string in ${} too long"); |
3970 | gflg = 1; |
3971 | global_env.linep -= 10; |
3972 | } |
3973 | *global_env.linep = 0; |
3974 | if (*s) |
3975 | for (cp = s + 1; *cp; cp++) |
3976 | if (any(*cp, "=-+?")) { |
3977 | c = *cp; |
3978 | *cp++ = 0; |
3979 | break; |
3980 | } |
3981 | if (s[1] == 0 && (*s == '*' || *s == '@')) { |
3982 | if (dolc > 1) { |
3983 | /* currently this does not distinguish $* and $@ */ |
3984 | /* should check dollar */ |
3985 | global_env.linep = s; |
3986 | PUSHIO(awordlist, dolv + 1, dolchar); |
3987 | return 0; |
3988 | } else { /* trap the nasty ${=} */ |
3989 | s[0] = '1'; |
3990 | s[1] = '\0'; |
3991 | } |
3992 | } |
3993 | vp = lookup(s); |
3994 | dolp = vp->value; |
3995 | if (dolp == null) { |
3996 | switch (c) { |
3997 | case '=': |
3998 | if (isdigit(*s)) { |
3999 | err("can't use ${...=...} with $n"); |
4000 | gflg = 1; |
4001 | break; |
4002 | } |
4003 | setval(vp, cp); |
4004 | dolp = vp->value; |
4005 | break; |
4006 | |
4007 | case '-': |
4008 | dolp = strsave(cp, areanum); |
4009 | break; |
4010 | |
4011 | case '?': |
4012 | if (*cp == 0) { |
4013 | prs("missing value for "); |
4014 | err(s); |
4015 | } else |
4016 | err(cp); |
4017 | gflg = 1; |
4018 | break; |
4019 | } |
4020 | } else if (c == '+') |
4021 | dolp = strsave(cp, areanum); |
4022 | if (FLAG['u'] && dolp == null) { |
4023 | prs("unset variable: "); |
4024 | err(s); |
4025 | gflg = 1; |
4026 | } |
4027 | global_env.linep = s; |
4028 | PUSHIO(aword, dolp, quoted ? qstrchar : strchar); |
4029 | return 0; |
4030 | } |
4031 | |
4032 | /* |
4033 | * Run the command in `...` and read its output. |
4034 | */ |
4035 | |
4036 | static int grave(int quoted) |
4037 | { |
4038 | /* moved to G: static char child_cmd[LINELIM]; */ |
4039 | |
4040 | const char *cp; |
4041 | int i; |
4042 | int j; |
4043 | int pf[2]; |
4044 | const char *src; |
4045 | char *dest; |
4046 | int count; |
4047 | int ignore; |
4048 | int ignore_once; |
4049 | char *argument_list[4]; |
4050 | struct wdblock *wb = NULL; |
4051 | |
4052 | #if __GNUC__ |
4053 | /* Avoid longjmp clobbering */ |
4054 | (void) &cp; |
4055 | #endif |
4056 | |
4057 | for (cp = global_env.iop->argp->aword; *cp != '`'; cp++) { |
4058 | if (*cp == 0) { |
4059 | err("no closing `"); |
4060 | return 0; |
4061 | } |
4062 | } |
4063 | |
4064 | /* string copy with dollar expansion */ |
4065 | src = global_env.iop->argp->aword; |
4066 | dest = child_cmd; |
4067 | count = 0; |
4068 | ignore = 0; |
4069 | ignore_once = 0; |
4070 | while ((*src != '`') && (count < LINELIM)) { |
4071 | if (*src == '\'') |
4072 | ignore = !ignore; |
4073 | if (*src == '\\') |
4074 | ignore_once = 1; |
4075 | if (*src == '$' && !ignore && !ignore_once) { |
4076 | struct var *vp; |
4077 | /* moved to G to reduce stack usage |
4078 | char var_name[LINELIM]; |
4079 | char alt_value[LINELIM]; |
4080 | */ |
4081 | #define var_name (G.grave__var_name) |
4082 | #define alt_value (G.grave__alt_value) |
4083 | int var_index = 0; |
4084 | int alt_index = 0; |
4085 | char operator = 0; |
4086 | int braces = 0; |
4087 | char *value; |
4088 | |
4089 | src++; |
4090 | if (*src == '{') { |
4091 | braces = 1; |
4092 | src++; |
4093 | } |
4094 | |
4095 | var_name[var_index++] = *src++; |
4096 | while (isalnum(*src) || *src=='_') |
4097 | var_name[var_index++] = *src++; |
4098 | var_name[var_index] = 0; |
4099 | |
4100 | if (braces) { |
4101 | switch (*src) { |
4102 | case '}': |
4103 | break; |
4104 | case '-': |
4105 | case '=': |
4106 | case '+': |
4107 | case '?': |
4108 | operator = * src; |
4109 | break; |
4110 | default: |
4111 | err("unclosed ${\n"); |
4112 | return 0; |
4113 | } |
4114 | if (operator) { |
4115 | src++; |
4116 | while (*src && (*src != '}')) { |
4117 | alt_value[alt_index++] = *src++; |
4118 | } |
4119 | alt_value[alt_index] = 0; |
4120 | if (*src != '}') { |
4121 | err("unclosed ${\n"); |
4122 | return 0; |
4123 | } |
4124 | } |
4125 | src++; |
4126 | } |
4127 | |
4128 | if (isalpha(*var_name)) { |
4129 | /* let subshell handle it instead */ |
4130 | |
4131 | char *namep = var_name; |
4132 | |
4133 | *dest++ = '$'; |
4134 | if (braces) |
4135 | *dest++ = '{'; |
4136 | while (*namep) |
4137 | *dest++ = *namep++; |
4138 | if (operator) { |
4139 | char *altp = alt_value; |
4140 | *dest++ = operator; |
4141 | while (*altp) |
4142 | *dest++ = *altp++; |
4143 | } |
4144 | if (braces) |
4145 | *dest++ = '}'; |
4146 | |
4147 | wb = addword(lookup(var_name)->name, wb); |
4148 | } else { |
4149 | /* expand */ |
4150 | |
4151 | vp = lookup(var_name); |
4152 | if (vp->value != null) |
4153 | value = (operator == '+') ? |
4154 | alt_value : vp->value; |
4155 | else if (operator == '?') { |
4156 | err(alt_value); |
4157 | return 0; |
4158 | } else if (alt_index && (operator != '+')) { |
4159 | value = alt_value; |
4160 | if (operator == '=') |
4161 | setval(vp, value); |
4162 | } else |
4163 | continue; |
4164 | |
4165 | while (*value && (count < LINELIM)) { |
4166 | *dest++ = *value++; |
4167 | count++; |
4168 | } |
4169 | } |
4170 | #undef var_name |
4171 | #undef alt_value |
4172 | } else { |
4173 | *dest++ = *src++; |
4174 | count++; |
4175 | ignore_once = 0; |
4176 | } |
4177 | } |
4178 | *dest = '\0'; |
4179 | |
4180 | if (openpipe(pf) < 0) |
4181 | return 0; |
4182 | |
4183 | while ((i = vfork()) == -1 && errno == EAGAIN) |
4184 | continue; |
4185 | |
4186 | DBGPRINTF3(("GRAVE: i is %p\n", io)); |
4187 | |
4188 | if (i < 0) { |
4189 | closepipe(pf); |
4190 | err((char *) bb_msg_memory_exhausted); |
4191 | return 0; |
4192 | } |
4193 | if (i != 0) { |
4194 | waitpid(i, NULL, 0); // safe_waitpid? |
4195 | global_env.iop->argp->aword = ++cp; |
4196 | close(pf[1]); |
4197 | PUSHIO(afile, remap(pf[0]), |
4198 | (int (*)(struct ioarg *)) ((quoted) ? qgravechar : gravechar)); |
4199 | return 1; |
4200 | } |
4201 | /* allow trapped signals */ |
4202 | /* XXX - Maybe this signal stuff should go as well? */ |
4203 | for (j = 0; j <= _NSIG; j++) |
4204 | if (ourtrap[j] && signal(j, SIG_IGN) != SIG_IGN) |
4205 | signal(j, SIG_DFL); |
4206 | |
4207 | /* Testcase where below checks are needed: |
4208 | * close stdout & run this script: |
4209 | * files=`ls` |
4210 | * echo "$files" >zz |
4211 | */ |
4212 | xmove_fd(pf[1], 1); |
4213 | if (pf[0] != 1) |
4214 | close(pf[0]); |
4215 | |
4216 | argument_list[0] = (char *) DEFAULT_SHELL; |
4217 | argument_list[1] = (char *) "-c"; |
4218 | argument_list[2] = child_cmd; |
4219 | argument_list[3] = NULL; |
4220 | |
4221 | cp = rexecve(argument_list[0], argument_list, makenv(1, wb)); |
4222 | prs(argument_list[0]); |
4223 | prs(": "); |
4224 | err(cp); |
4225 | _exit(EXIT_FAILURE); |
4226 | } |
4227 | |
4228 | |
4229 | static char *unquote(char *as) |
4230 | { |
4231 | char *s; |
4232 | |
4233 | s = as; |
4234 | if (s != NULL) |
4235 | while (*s) |
4236 | *s++ &= ~QUOTE; |
4237 | return as; |
4238 | } |
4239 | |
4240 | /* -------- glob.c -------- */ |
4241 | |
4242 | /* |
4243 | * glob |
4244 | */ |
4245 | |
4246 | #define scopy(x) strsave((x), areanum) |
4247 | #define BLKSIZ 512 |
4248 | #define NDENT ((BLKSIZ+sizeof(struct dirent)-1)/sizeof(struct dirent)) |
4249 | |
4250 | static struct wdblock *cl, *nl; |
4251 | static const char spcl[] ALIGN1= "[?*"; |
4252 | |
4253 | static struct wdblock *glob(char *cp, struct wdblock *wb) |
4254 | { |
4255 | int i; |
4256 | char *pp; |
4257 | |
4258 | if (cp == 0) |
4259 | return wb; |
4260 | i = 0; |
4261 | for (pp = cp; *pp; pp++) |
4262 | if (any(*pp, spcl)) |
4263 | i++; |
4264 | else if (!any(*pp & ~QUOTE, spcl)) |
4265 | *pp &= ~QUOTE; |
4266 | if (i != 0) { |
4267 | for (cl = addword(scopy(cp), NULL); anyspcl(cl); cl = nl) { |
4268 | nl = newword(cl->w_nword * 2); |
4269 | for (i = 0; i < cl->w_nword; i++) { /* for each argument */ |
4270 | for (pp = cl->w_words[i]; *pp; pp++) |
4271 | if (any(*pp, spcl)) { |
4272 | globname(cl->w_words[i], pp); |
4273 | break; |
4274 | } |
4275 | if (*pp == '\0') |
4276 | nl = addword(scopy(cl->w_words[i]), nl); |
4277 | } |
4278 | for (i = 0; i < cl->w_nword; i++) |
4279 | DELETE(cl->w_words[i]); |
4280 | DELETE(cl); |
4281 | } |
4282 | if (cl->w_nword) { |
4283 | for (i = 0; i < cl->w_nword; i++) |
4284 | unquote(cl->w_words[i]); |
4285 | qsort_string_vector(cl->w_words, cl->w_nword); |
4286 | for (i = 0; i < cl->w_nword; i++) |
4287 | wb = addword(cl->w_words[i], wb); |
4288 | DELETE(cl); |
4289 | return wb; |
4290 | } |
4291 | } |
4292 | wb = addword(unquote(cp), wb); |
4293 | return wb; |
4294 | } |
4295 | |
4296 | static void globname(char *we, char *pp) |
4297 | { |
4298 | char *np, *cp; |
4299 | char *name, *gp, *dp; |
4300 | int k; |
4301 | DIR *dirp; |
4302 | struct dirent *de; |
4303 | char dname[NAME_MAX + 1]; |
4304 | struct stat dbuf; |
4305 | |
4306 | for (np = we; np != pp; pp--) |
4307 | if (pp[-1] == '/') |
4308 | break; |
4309 | dp = cp = get_space((int) (pp - np) + 3); |
4310 | while (np < pp) |
4311 | *cp++ = *np++; |
4312 | *cp++ = '.'; |
4313 | *cp = '\0'; |
4314 | gp = cp = get_space(strlen(pp) + 1); |
4315 | while (*np && *np != '/') |
4316 | *cp++ = *np++; |
4317 | *cp = '\0'; |
4318 | dirp = opendir(dp); |
4319 | if (dirp == 0) { |
4320 | DELETE(dp); |
4321 | DELETE(gp); |
4322 | return; |
4323 | } |
4324 | dname[NAME_MAX] = '\0'; |
4325 | while ((de = readdir(dirp)) != NULL) { |
4326 | /* XXX Hmmm... What this could be? (abial) */ |
4327 | /* if (ent[j].d_ino == 0) continue; |
4328 | */ |
4329 | strncpy(dname, de->d_name, NAME_MAX); |
4330 | if (dname[0] == '.') |
4331 | if (*gp != '.') |
4332 | continue; |
4333 | for (k = 0; k < NAME_MAX; k++) |
4334 | if (any(dname[k], spcl)) |
4335 | dname[k] |= QUOTE; |
4336 | if (gmatch(dname, gp)) { |
4337 | name = generate(we, pp, dname, np); |
4338 | if (*np && !anys(np, spcl)) { |
4339 | if (stat(name, &dbuf)) { |
4340 | DELETE(name); |
4341 | continue; |
4342 | } |
4343 | } |
4344 | nl = addword(name, nl); |
4345 | } |
4346 | } |
4347 | closedir(dirp); |
4348 | DELETE(dp); |
4349 | DELETE(gp); |
4350 | } |
4351 | |
4352 | /* |
4353 | * generate a pathname as below. |
4354 | * start..end1 / middle end |
4355 | * the slashes come for free |
4356 | */ |
4357 | static char *generate(char *start1, char *end1, char *middle, char *end) |
4358 | { |
4359 | char *p; |
4360 | char *op, *xp; |
4361 | |
4362 | p = op = get_space((int)(end1 - start1) + strlen(middle) + strlen(end) + 2); |
4363 | xp = start1; |
4364 | while (xp != end1) |
4365 | *op++ = *xp++; |
4366 | xp = middle; |
4367 | while (*xp != '\0') |
4368 | *op++ = *xp++; |
4369 | strcpy(op, end); |
4370 | return p; |
4371 | } |
4372 | |
4373 | static int anyspcl(struct wdblock *wb) |
4374 | { |
4375 | int i; |
4376 | char **wd; |
4377 | |
4378 | wd = wb->w_words; |
4379 | for (i = 0; i < wb->w_nword; i++) |
4380 | if (anys(spcl, *wd++)) |
4381 | return 1; |
4382 | return 0; |
4383 | } |
4384 | |
4385 | |
4386 | /* -------- word.c -------- */ |
4387 | |
4388 | static struct wdblock *newword(int nw) |
4389 | { |
4390 | struct wdblock *wb; |
4391 | |
4392 | wb = get_space(sizeof(*wb) + nw * sizeof(char *)); |
4393 | wb->w_bsize = nw; |
4394 | wb->w_nword = 0; |
4395 | return wb; |
4396 | } |
4397 | |
4398 | static struct wdblock *addword(char *wd, struct wdblock *wb) |
4399 | { |
4400 | struct wdblock *wb2; |
4401 | int nw; |
4402 | |
4403 | if (wb == NULL) |
4404 | wb = newword(NSTART); |
4405 | nw = wb->w_nword; |
4406 | if (nw >= wb->w_bsize) { |
4407 | wb2 = newword(nw * 2); |
4408 | memcpy((char *) wb2->w_words, (char *) wb->w_words, |
4409 | nw * sizeof(char *)); |
4410 | wb2->w_nword = nw; |
4411 | DELETE(wb); |
4412 | wb = wb2; |
4413 | } |
4414 | wb->w_words[wb->w_nword++] = wd; |
4415 | return wb; |
4416 | } |
4417 | |
4418 | static char **getwords(struct wdblock *wb) |
4419 | { |
4420 | char **wd; |
4421 | int nb; |
4422 | |
4423 | if (wb == NULL) |
4424 | return NULL; |
4425 | if (wb->w_nword == 0) { |
4426 | DELETE(wb); |
4427 | return NULL; |
4428 | } |
4429 | nb = sizeof(*wd) * wb->w_nword; |
4430 | wd = get_space(nb); |
4431 | memcpy(wd, wb->w_words, nb); |
4432 | DELETE(wb); /* perhaps should done by caller */ |
4433 | return wd; |
4434 | } |
4435 | |
4436 | |
4437 | /* -------- io.c -------- */ |
4438 | |
4439 | /* |
4440 | * shell IO |
4441 | */ |
4442 | |
4443 | static int my_getc(int ec) |
4444 | { |
4445 | int c; |
4446 | |
4447 | if (global_env.linep > elinep) { |
4448 | while ((c = readc()) != '\n' && c) |
4449 | continue; |
4450 | err("input line too long"); |
4451 | gflg = 1; |
4452 | return c; |
4453 | } |
4454 | c = readc(); |
4455 | if ((ec != '\'') && (ec != '`') && (global_env.iop->task != XGRAVE)) { |
4456 | if (c == '\\') { |
4457 | c = readc(); |
4458 | if (c == '\n' && ec != '\"') |
4459 | return my_getc(ec); |
4460 | c |= QUOTE; |
4461 | } |
4462 | } |
4463 | return c; |
4464 | } |
4465 | |
4466 | static void unget(int c) |
4467 | { |
4468 | if (global_env.iop >= global_env.iobase) |
4469 | global_env.iop->peekc = c; |
4470 | } |
4471 | |
4472 | static int eofc(void) |
4473 | { |
4474 | return global_env.iop < global_env.iobase || (global_env.iop->peekc == 0 && global_env.iop->prev == 0); |
4475 | } |
4476 | |
4477 | static int readc(void) |
4478 | { |
4479 | int c; |
4480 | |
4481 | RCPRINTF(("READC: global_env.iop %p, global_env.iobase %p\n", global_env.iop, global_env.iobase)); |
4482 | |
4483 | for (; global_env.iop >= global_env.iobase; global_env.iop--) { |
4484 | RCPRINTF(("READC: global_env.iop %p, peekc 0x%x\n", global_env.iop, global_env.iop->peekc)); |
4485 | c = global_env.iop->peekc; |
4486 | if (c != '\0') { |
4487 | global_env.iop->peekc = 0; |
4488 | return c; |
4489 | } |
4490 | if (global_env.iop->prev != 0) { |
4491 | c = (*global_env.iop->iofn)(global_env.iop->argp, global_env.iop); |
4492 | if (c != '\0') { |
4493 | if (c == -1) { |
4494 | global_env.iop++; |
4495 | continue; |
4496 | } |
4497 | if (global_env.iop == iostack) |
4498 | ioecho(c); |
4499 | global_env.iop->prev = c; |
4500 | return c; |
4501 | } |
4502 | if (global_env.iop->task == XIO && global_env.iop->prev != '\n') { |
4503 | global_env.iop->prev = 0; |
4504 | if (global_env.iop == iostack) |
4505 | ioecho('\n'); |
4506 | return '\n'; |
4507 | } |
4508 | } |
4509 | if (global_env.iop->task == XIO) { |
4510 | if (multiline) { |
4511 | global_env.iop->prev = 0; |
4512 | return 0; |
4513 | } |
4514 | if (interactive && global_env.iop == iostack + 1) { |
4515 | #if ENABLE_FEATURE_EDITING |
4516 | current_prompt = prompt->value; |
4517 | #else |
4518 | prs(prompt->value); |
4519 | #endif |
4520 | } |
4521 | } |
4522 | } /* FOR */ |
4523 | |
4524 | if (global_env.iop >= iostack) { |
4525 | RCPRINTF(("READC: return 0, global_env.iop %p\n", global_env.iop)); |
4526 | return 0; |
4527 | } |
4528 | |
4529 | DBGPRINTF(("READC: leave()...\n")); |
4530 | leave(); |
4531 | /* NOTREACHED */ |
4532 | return 0; |
4533 | } |
4534 | |
4535 | static void ioecho(char c) |
4536 | { |
4537 | if (FLAG['v']) |
4538 | write(STDERR_FILENO, &c, sizeof c); |
4539 | } |
4540 | |
4541 | static void pushio(struct ioarg *argp, int (*fn) (struct ioarg *)) |
4542 | { |
4543 | DBGPRINTF(("PUSHIO: argp %p, argp->afid 0x%x, global_env.iop %p\n", argp, |
4544 | argp->afid, global_env.iop)); |
4545 | |
4546 | /* Set env ptr for io source to next array spot and check for array overflow */ |
4547 | if (++global_env.iop >= &iostack[NPUSH]) { |
4548 | global_env.iop--; |
4549 | err("Shell input nested too deeply"); |
4550 | gflg = 1; |
4551 | return; |
4552 | } |
4553 | |
4554 | /* We did not overflow the NPUSH array spots so setup data structs */ |
4555 | |
4556 | global_env.iop->iofn = (int (*)(struct ioarg *, struct io *)) fn; /* Store data source func ptr */ |
4557 | |
4558 | if (argp->afid != AFID_NOBUF) |
4559 | global_env.iop->argp = argp; |
4560 | else { |
4561 | |
4562 | global_env.iop->argp = ioargstack + (global_env.iop - iostack); /* MAL - index into stack */ |
4563 | *global_env.iop->argp = *argp; /* copy data from temp area into stack spot */ |
4564 | |
4565 | /* MAL - mainbuf is for 1st data source (command line?) and all nested use a single shared buffer? */ |
4566 | |
4567 | if (global_env.iop == &iostack[0]) |
4568 | global_env.iop->argp->afbuf = &mainbuf; |
4569 | else |
4570 | global_env.iop->argp->afbuf = &sharedbuf; |
4571 | |
4572 | /* MAL - if not a termimal AND (commandline OR readable file) then give it a buffer id? */ |
4573 | /* This line appears to be active when running scripts from command line */ |
4574 | if ((isatty(global_env.iop->argp->afile) == 0) |
4575 | && (global_env.iop == &iostack[0] |
4576 | || lseek(global_env.iop->argp->afile, 0L, SEEK_CUR) != -1)) { |
4577 | if (++bufid == AFID_NOBUF) /* counter rollover check, AFID_NOBUF = 11111111 */ |
4578 | bufid = AFID_ID; /* AFID_ID = 0 */ |
4579 | |
4580 | global_env.iop->argp->afid = bufid; /* assign buffer id */ |
4581 | } |
4582 | |
4583 | DBGPRINTF(("PUSHIO: iostack %p, global_env.iop %p, afbuf %p\n", |
4584 | iostack, global_env.iop, global_env.iop->argp->afbuf)); |
4585 | DBGPRINTF(("PUSHIO: mbuf %p, sbuf %p, bid %d, global_env.iop %p\n", |
4586 | &mainbuf, &sharedbuf, bufid, global_env.iop)); |
4587 | |
4588 | } |
4589 | |
4590 | global_env.iop->prev = ~'\n'; |
4591 | global_env.iop->peekc = 0; |
4592 | global_env.iop->xchar = 0; |
4593 | global_env.iop->nlcount = 0; |
4594 | |
4595 | if (fn == filechar || fn == linechar) |
4596 | global_env.iop->task = XIO; |
4597 | else if (fn == (int (*)(struct ioarg *)) gravechar |
4598 | || fn == (int (*)(struct ioarg *)) qgravechar) |
4599 | global_env.iop->task = XGRAVE; |
4600 | else |
4601 | global_env.iop->task = XOTHER; |
4602 | } |
4603 | |
4604 | static struct io *setbase(struct io *ip) |
4605 | { |
4606 | struct io *xp; |
4607 | |
4608 | xp = global_env.iobase; |
4609 | global_env.iobase = ip; |
4610 | return xp; |
4611 | } |
4612 | |
4613 | /* |
4614 | * Input generating functions |
4615 | */ |
4616 | |
4617 | /* |
4618 | * Produce the characters of a string, then a newline, then NUL. |
4619 | */ |
4620 | static int nlchar(struct ioarg *ap) |
4621 | { |
4622 | char c; |
4623 | |
4624 | if (ap->aword == NULL) |
4625 | return '\0'; |
4626 | c = *ap->aword++; |
4627 | if (c == '\0') { |
4628 | ap->aword = NULL; |
4629 | return '\n'; |
4630 | } |
4631 | return c; |
4632 | } |
4633 | |
4634 | /* |
4635 | * Given a list of words, produce the characters |
4636 | * in them, with a space after each word. |
4637 | */ |
4638 | static int wdchar(struct ioarg *ap) |
4639 | { |
4640 | char c; |
4641 | char **wl; |
4642 | |
4643 | wl = ap->awordlist; |
4644 | if (wl == NULL) |
4645 | return 0; |
4646 | if (*wl != NULL) { |
4647 | c = *(*wl)++; |
4648 | if (c != 0) |
4649 | return c & 0177; |
4650 | ap->awordlist++; |
4651 | return ' '; |
4652 | } |
4653 | ap->awordlist = NULL; |
4654 | return '\n'; |
4655 | } |
4656 | |
4657 | /* |
4658 | * Return the characters of a list of words, |
4659 | * producing a space between them. |
4660 | */ |
4661 | static int dolchar(struct ioarg *ap) |
4662 | { |
4663 | char *wp; |
4664 | |
4665 | wp = *ap->awordlist++; |
4666 | if (wp != NULL) { |
4667 | PUSHIO(aword, wp, *ap->awordlist == NULL ? strchar : xxchar); |
4668 | return -1; |
4669 | } |
4670 | return 0; |
4671 | } |
4672 | |
4673 | static int xxchar(struct ioarg *ap) |
4674 | { |
4675 | int c; |
4676 | |
4677 | if (ap->aword == NULL) |
4678 | return 0; |
4679 | c = *ap->aword++; |
4680 | if (c == '\0') { |
4681 | ap->aword = NULL; |
4682 | return ' '; |
4683 | } |
4684 | return c; |
4685 | } |
4686 | |
4687 | /* |
4688 | * Produce the characters from a single word (string). |
4689 | */ |
4690 | static int strchar(struct ioarg *ap) |
4691 | { |
4692 | if (ap->aword == NULL) |
4693 | return 0; |
4694 | return *ap->aword++; |
4695 | } |
4696 | |
4697 | /* |
4698 | * Produce quoted characters from a single word (string). |
4699 | */ |
4700 | static int qstrchar(struct ioarg *ap) |
4701 | { |
4702 | int c; |
4703 | |
4704 | if (ap->aword == NULL) |
4705 | return 0; |
4706 | c = *ap->aword++; |
4707 | if (c) |
4708 | c |= QUOTE; |
4709 | return c; |
4710 | } |
4711 | |
4712 | /* |
4713 | * Return the characters from a file. |
4714 | */ |
4715 | static int filechar(struct ioarg *ap) |
4716 | { |
4717 | int i; |
4718 | char c; |
4719 | struct iobuf *bp = ap->afbuf; |
4720 | |
4721 | if (ap->afid != AFID_NOBUF) { |
4722 | i = (ap->afid != bp->id); |
4723 | if (i || bp->bufp == bp->ebufp) { |
4724 | if (i) |
4725 | lseek(ap->afile, ap->afpos, SEEK_SET); |
4726 | |
4727 | i = nonblock_safe_read(ap->afile, bp->buf, sizeof(bp->buf)); |
4728 | if (i <= 0) { |
4729 | closef(ap->afile); |
4730 | return 0; |
4731 | } |
4732 | |
4733 | bp->id = ap->afid; |
4734 | bp->bufp = bp->buf; |
4735 | bp->ebufp = bp->bufp + i; |
4736 | } |
4737 | |
4738 | ap->afpos++; |
4739 | return *bp->bufp++ & 0177; |
4740 | } |
4741 | #if ENABLE_FEATURE_EDITING |
4742 | if (interactive && isatty(ap->afile)) { |
4743 | /* moved to G: static char filechar_cmdbuf[BUFSIZ]; */ |
4744 | static int position = 0, size = 0; |
4745 | |
4746 | while (size == 0 || position >= size) { |
4747 | size = read_line_input(current_prompt, filechar_cmdbuf, BUFSIZ, line_input_state); |
4748 | if (size < 0) /* Error/EOF */ |
4749 | exit(EXIT_SUCCESS); |
4750 | position = 0; |
4751 | /* if Ctrl-C, size == 0 and loop will repeat */ |
4752 | } |
4753 | c = filechar_cmdbuf[position]; |
4754 | position++; |
4755 | return c; |
4756 | } |
4757 | #endif |
4758 | i = nonblock_safe_read(ap->afile, &c, sizeof(c)); |
4759 | return i == sizeof(c) ? (c & 0x7f) : (closef(ap->afile), 0); |
4760 | } |
4761 | |
4762 | /* |
4763 | * Return the characters from a here temp file. |
4764 | */ |
4765 | static int herechar(struct ioarg *ap) |
4766 | { |
4767 | char c; |
4768 | |
4769 | if (nonblock_safe_read(ap->afile, &c, sizeof(c)) != sizeof(c)) { |
4770 | close(ap->afile); |
4771 | c = '\0'; |
4772 | } |
4773 | return c; |
4774 | } |
4775 | |
4776 | /* |
4777 | * Return the characters produced by a process (`...`). |
4778 | * Quote them if required, and remove any trailing newline characters. |
4779 | */ |
4780 | static int gravechar(struct ioarg *ap, struct io *iop) |
4781 | { |
4782 | int c; |
4783 | |
4784 | c = qgravechar(ap, iop) & ~QUOTE; |
4785 | if (c == '\n') |
4786 | c = ' '; |
4787 | return c; |
4788 | } |
4789 | |
4790 | static int qgravechar(struct ioarg *ap, struct io *iop) |
4791 | { |
4792 | int c; |
4793 | |
4794 | DBGPRINTF3(("QGRAVECHAR: enter, ap=%p, iop=%p\n", ap, iop)); |
4795 | |
4796 | if (iop->xchar) { |
4797 | if (iop->nlcount) { |
4798 | iop->nlcount--; |
4799 | return '\n' | QUOTE; |
4800 | } |
4801 | c = iop->xchar; |
4802 | iop->xchar = 0; |
4803 | } else if ((c = filechar(ap)) == '\n') { |
4804 | iop->nlcount = 1; |
4805 | while ((c = filechar(ap)) == '\n') |
4806 | iop->nlcount++; |
4807 | iop->xchar = c; |
4808 | if (c == 0) |
4809 | return c; |
4810 | iop->nlcount--; |
4811 | c = '\n'; |
4812 | } |
4813 | return c != 0 ? c | QUOTE : 0; |
4814 | } |
4815 | |
4816 | /* |
4817 | * Return a single command (usually the first line) from a file. |
4818 | */ |
4819 | static int linechar(struct ioarg *ap) |
4820 | { |
4821 | int c; |
4822 | |
4823 | c = filechar(ap); |
4824 | if (c == '\n') { |
4825 | if (!multiline) { |
4826 | closef(ap->afile); |
4827 | ap->afile = -1; /* illegal value */ |
4828 | } |
4829 | } |
4830 | return c; |
4831 | } |
4832 | |
4833 | /* |
4834 | * Remap fd into shell's fd space |
4835 | */ |
4836 | static int remap(int fd) |
4837 | { |
4838 | int i; |
4839 | int map[NOFILE]; |
4840 | int newfd; |
4841 | |
4842 | DBGPRINTF(("REMAP: fd=%d, global_env.iofd=%d\n", fd, global_env.iofd)); |
4843 | |
4844 | if (fd < global_env.iofd) { |
4845 | for (i = 0; i < NOFILE; i++) |
4846 | map[i] = 0; |
4847 | |
4848 | do { |
4849 | map[fd] = 1; |
4850 | newfd = dup(fd); |
4851 | fd = newfd; |
4852 | } while (fd >= 0 && fd < global_env.iofd); |
4853 | |
4854 | for (i = 0; i < NOFILE; i++) |
4855 | if (map[i]) |
4856 | close(i); |
4857 | |
4858 | if (fd < 0) |
4859 | err("too many files open in shell"); |
4860 | } |
4861 | |
4862 | return fd; |
4863 | } |
4864 | |
4865 | static int openpipe(int *pv) |
4866 | { |
4867 | int i; |
4868 | |
4869 | i = pipe(pv); |
4870 | if (i < 0) |
4871 | err("can't create pipe - try again"); |
4872 | return i; |
4873 | } |
4874 | |
4875 | static void closepipe(int *pv) |
4876 | { |
4877 | if (pv != NULL) { |
4878 | close(pv[0]); |
4879 | close(pv[1]); |
4880 | } |
4881 | } |
4882 | |
4883 | |
4884 | /* -------- here.c -------- */ |
4885 | |
4886 | /* |
4887 | * here documents |
4888 | */ |
4889 | |
4890 | static void markhere(char *s, struct ioword *iop) |
4891 | { |
4892 | struct here *h, *lh; |
4893 | |
4894 | DBGPRINTF7(("MARKHERE: enter, s=%p\n", s)); |
4895 | |
4896 | h = get_space(sizeof(struct here)); |
4897 | if (h == NULL) |
4898 | return; |
4899 | |
4900 | h->h_tag = evalstr(s, DOSUB); |
4901 | if (h->h_tag == 0) |
4902 | return; |
4903 | |
4904 | h->h_iop = iop; |
4905 | iop->io_name = 0; |
4906 | h->h_next = NULL; |
4907 | if (inhere == 0) |
4908 | inhere = h; |
4909 | else { |
4910 | for (lh = inhere; lh != NULL; lh = lh->h_next) { |
4911 | if (lh->h_next == 0) { |
4912 | lh->h_next = h; |
4913 | break; |
4914 | } |
4915 | } |
4916 | } |
4917 | iop->io_flag |= IOHERE | IOXHERE; |
4918 | for (s = h->h_tag; *s; s++) { |
4919 | if (*s & QUOTE) { |
4920 | iop->io_flag &= ~IOXHERE; |
4921 | *s &= ~QUOTE; |
4922 | } |
4923 | } |
4924 | h->h_dosub = ((iop->io_flag & IOXHERE) ? '\0' : '\''); |
4925 | } |
4926 | |
4927 | static void gethere(void) |
4928 | { |
4929 | struct here *h, *hp; |
4930 | |
4931 | DBGPRINTF7(("GETHERE: enter...\n")); |
4932 | |
4933 | /* Scan here files first leaving inhere list in place */ |
4934 | for (hp = h = inhere; h != NULL; hp = h, h = h->h_next) |
4935 | readhere(&h->h_iop->io_name, h->h_tag, h->h_dosub /* NUL or ' */); |
4936 | |
4937 | /* Make inhere list active - keep list intact for scraphere */ |
4938 | if (hp != NULL) { |
4939 | hp->h_next = acthere; |
4940 | acthere = inhere; |
4941 | inhere = NULL; |
4942 | } |
4943 | } |
4944 | |
4945 | static void readhere(char **name, char *s, int ec) |
4946 | { |
4947 | int tf; |
4948 | char tname[30] = ".msh_XXXXXX"; |
4949 | int c; |
4950 | jmp_buf ev; |
4951 | char myline[LINELIM + 1]; |
4952 | char *thenext; |
4953 | |
4954 | DBGPRINTF7(("READHERE: enter, name=%p, s=%p\n", name, s)); |
4955 | |
4956 | tf = mkstemp(tname); |
4957 | if (tf < 0) |
4958 | return; |
4959 | |
4960 | *name = strsave(tname, areanum); |
4961 | errpt = ev; |
4962 | if (newenv(setjmp(errpt)) != 0) |
4963 | unlink(tname); |
4964 | else { |
4965 | pushio(global_env.iop->argp, (int (*)(struct ioarg *)) global_env.iop->iofn); |
4966 | global_env.iobase = global_env.iop; |
4967 | for (;;) { |
4968 | if (interactive && global_env.iop <= iostack) { |
4969 | #if ENABLE_FEATURE_EDITING |
4970 | current_prompt = cprompt->value; |
4971 | #else |
4972 | prs(cprompt->value); |
4973 | #endif |
4974 | } |
4975 | thenext = myline; |
4976 | while ((c = my_getc(ec)) != '\n' && c) { |
4977 | if (ec == '\'') |
4978 | c &= ~QUOTE; |
4979 | if (thenext >= &myline[LINELIM]) { |
4980 | c = 0; |
4981 | break; |
4982 | } |
4983 | *thenext++ = c; |
4984 | } |
4985 | *thenext = 0; |
4986 | if (strcmp(s, myline) == 0 || c == 0) |
4987 | break; |
4988 | *thenext++ = '\n'; |
4989 | write(tf, myline, (int) (thenext - myline)); |
4990 | } |
4991 | if (c == 0) { |
4992 | prs("here document `"); |
4993 | prs(s); |
4994 | err("' unclosed"); |
4995 | } |
4996 | quitenv(); |
4997 | } |
4998 | close(tf); |
4999 | } |
5000 | |
5001 | /* |
5002 | * open here temp file. |
5003 | * if unquoted here, expand here temp file into second temp file. |
5004 | */ |
5005 | static int herein(char *hname, int xdoll) |
5006 | { |
5007 | int hf; |
5008 | int tf; |
5009 | |
5010 | #if __GNUC__ |
5011 | /* Avoid longjmp clobbering */ |
5012 | (void) &tf; |
5013 | #endif |
5014 | if (hname == NULL) |
5015 | return -1; |
5016 | |
5017 | DBGPRINTF7(("HEREIN: hname is %s, xdoll=%d\n", hname, xdoll)); |
5018 | |
5019 | hf = open(hname, O_RDONLY); |
5020 | if (hf < 0) |
5021 | return -1; |
5022 | |
5023 | if (xdoll) { |
5024 | char c; |
5025 | char tname[30] = ".msh_XXXXXX"; |
5026 | jmp_buf ev; |
5027 | |
5028 | tf = mkstemp(tname); |
5029 | if (tf < 0) |
5030 | return -1; |
5031 | errpt = ev; |
5032 | if (newenv(setjmp(errpt)) == 0) { |
5033 | PUSHIO(afile, hf, herechar); |
5034 | setbase(global_env.iop); |
5035 | while ((c = subgetc(0, 0)) != 0) { |
5036 | c &= ~QUOTE; |
5037 | write(tf, &c, sizeof c); |
5038 | } |
5039 | quitenv(); |
5040 | } else |
5041 | unlink(tname); |
5042 | close(tf); |
5043 | tf = open(tname, O_RDONLY); |
5044 | unlink(tname); |
5045 | return tf; |
5046 | } |
5047 | return hf; |
5048 | } |
5049 | |
5050 | static void scraphere(void) |
5051 | { |
5052 | struct here *h; |
5053 | |
5054 | DBGPRINTF7(("SCRAPHERE: enter...\n")); |
5055 | |
5056 | for (h = inhere; h != NULL; h = h->h_next) { |
5057 | if (h->h_iop && h->h_iop->io_name) |
5058 | unlink(h->h_iop->io_name); |
5059 | } |
5060 | inhere = NULL; |
5061 | } |
5062 | |
5063 | /* unlink here temp files before a freearea(area) */ |
5064 | static void freehere(int area) |
5065 | { |
5066 | struct here *h, *hl; |
5067 | |
5068 | DBGPRINTF6(("FREEHERE: enter, area=%d\n", area)); |
5069 | |
5070 | hl = NULL; |
5071 | for (h = acthere; h != NULL; h = h->h_next) { |
5072 | if (getarea((char *) h) >= area) { |
5073 | if (h->h_iop->io_name != NULL) |
5074 | unlink(h->h_iop->io_name); |
5075 | if (hl == NULL) |
5076 | acthere = h->h_next; |
5077 | else |
5078 | hl->h_next = h->h_next; |
5079 | } else { |
5080 | hl = h; |
5081 | } |
5082 | } |
5083 | } |
5084 | |
5085 | |
5086 | /* -------- sh.c -------- */ |
5087 | /* |
5088 | * shell |
5089 | */ |
5090 | |
5091 | int msh_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
5092 | int msh_main(int argc, char **argv) |
5093 | { |
5094 | int f; |
5095 | char *s; |
5096 | int cflag; |
5097 | char *name, **ap; |
5098 | int (*iof) (struct ioarg *); |
5099 | |
5100 | INIT_G(); |
5101 | |
5102 | sharedbuf.id = AFID_NOBUF; |
5103 | mainbuf.id = AFID_NOBUF; |
5104 | elinep = line + sizeof(line) - 5; |
5105 | |
5106 | #if ENABLE_FEATURE_EDITING |
5107 | line_input_state = new_line_input_t(FOR_SHELL); |
5108 | #endif |
5109 | |
5110 | DBGPRINTF(("MSH_MAIN: argc %d, environ %p\n", argc, environ)); |
5111 | |
5112 | initarea(); |
5113 | ap = environ; |
5114 | if (ap != NULL) { |
5115 | while (*ap) |
5116 | assign(*ap++, !COPYV); |
5117 | for (ap = environ; *ap;) |
5118 | export(lookup(*ap++)); |
5119 | } |
5120 | closeall(); |
5121 | areanum = 1; |
5122 | |
5123 | shell = lookup("SHELL"); |
5124 | if (shell->value == null) |
5125 | setval(shell, (char *)DEFAULT_SHELL); |
5126 | export(shell); |
5127 | |
5128 | homedir = lookup("HOME"); |
5129 | if (homedir->value == null) |
5130 | setval(homedir, "/"); |
5131 | export(homedir); |
5132 | |
5133 | setval(lookup("$"), putn(getpid())); |
5134 | |
5135 | path = lookup("PATH"); |
5136 | if (path->value == null) { |
5137 | /* Can be merged with same string elsewhere in bbox */ |
5138 | if (geteuid() == 0) |
5139 | setval(path, bb_default_root_path); |
5140 | else |
5141 | setval(path, bb_default_path); |
5142 | } |
5143 | export(path); |
5144 | |
5145 | ifs = lookup("IFS"); |
5146 | if (ifs->value == null) |
5147 | setval(ifs, " \t\n"); |
5148 | |
5149 | #ifdef MSHDEBUG |
5150 | mshdbg_var = lookup("MSHDEBUG"); |
5151 | if (mshdbg_var->value == null) |
5152 | setval(mshdbg_var, "0"); |
5153 | #endif |
5154 | |
5155 | prompt = lookup("PS1"); |
5156 | #if ENABLE_FEATURE_EDITING_FANCY_PROMPT |
5157 | if (prompt->value == null) |
5158 | #endif |
5159 | setval(prompt, DEFAULT_USER_PROMPT); |
5160 | if (geteuid() == 0) { |
5161 | setval(prompt, DEFAULT_ROOT_PROMPT); |
5162 | prompt->status &= ~EXPORT; |
5163 | } |
5164 | cprompt = lookup("PS2"); |
5165 | #if ENABLE_FEATURE_EDITING_FANCY_PROMPT |
5166 | if (cprompt->value == null) |
5167 | #endif |
5168 | setval(cprompt, "> "); |
5169 | |
5170 | iof = filechar; |
5171 | cflag = 0; |
5172 | name = *argv++; |
5173 | if (--argc >= 1) { |
5174 | if (argv[0][0] == '-' && argv[0][1] != '\0') { |
5175 | for (s = argv[0] + 1; *s; s++) |
5176 | switch (*s) { |
5177 | case 'c': |
5178 | prompt->status &= ~EXPORT; |
5179 | cprompt->status &= ~EXPORT; |
5180 | setval(prompt, ""); |
5181 | setval(cprompt, ""); |
5182 | cflag = 1; |
5183 | if (--argc > 0) |
5184 | PUSHIO(aword, *++argv, iof = nlchar); |
5185 | break; |
5186 | |
5187 | case 'q': |
5188 | qflag = SIG_DFL; |
5189 | break; |
5190 | |
5191 | case 's': |
5192 | /* standard input */ |
5193 | break; |
5194 | |
5195 | case 't': |
5196 | prompt->status &= ~EXPORT; |
5197 | setval(prompt, ""); |
5198 | iof = linechar; |
5199 | break; |
5200 | |
5201 | case 'i': |
5202 | interactive = 1; |
5203 | default: |
5204 | if (*s >= 'a' && *s <= 'z') |
5205 | FLAG[(int) *s]++; |
5206 | } |
5207 | } else { |
5208 | argv--; |
5209 | argc++; |
5210 | } |
5211 | |
5212 | if (iof == filechar && --argc > 0) { |
5213 | setval(prompt, ""); |
5214 | setval(cprompt, ""); |
5215 | prompt->status &= ~EXPORT; |
5216 | cprompt->status &= ~EXPORT; |
5217 | |
5218 | /* Shell is non-interactive, activate printf-based debug */ |
5219 | #ifdef MSHDEBUG |
5220 | mshdbg = mshdbg_var->value[0] - '0'; |
5221 | if (mshdbg < 0) |
5222 | mshdbg = 0; |
5223 | #endif |
5224 | DBGPRINTF(("MSH_MAIN: calling newfile()\n")); |
5225 | |
5226 | name = *++argv; |
5227 | if (newfile(name)) |
5228 | exit(EXIT_FAILURE); /* Exit on error */ |
5229 | } |
5230 | } |
5231 | |
5232 | setdash(); |
5233 | |
5234 | /* This won't be true if PUSHIO has been called, say from newfile() above */ |
5235 | if (global_env.iop < iostack) { |
5236 | PUSHIO(afile, 0, iof); |
5237 | if (isatty(0) && isatty(1) && !cflag) { |
5238 | interactive = 1; |
5239 | #if !ENABLE_FEATURE_SH_EXTRA_QUIET |
5240 | #ifdef MSHDEBUG |
5241 | printf("\n\n%s built-in shell (msh with debug)\n", bb_banner); |
5242 | #else |
5243 | printf("\n\n%s built-in shell (msh)\n", bb_banner); |
5244 | #endif |
5245 | printf("Enter 'help' for a list of built-in commands.\n\n"); |
5246 | #endif |
5247 | } |
5248 | } |
5249 | |
5250 | signal(SIGQUIT, qflag); |
5251 | if (name && name[0] == '-') { |
5252 | interactive = 1; |
5253 | f = open(".profile", O_RDONLY); |
5254 | if (f >= 0) |
5255 | next(remap(f)); |
5256 | f = open("/etc/profile", O_RDONLY); |
5257 | if (f >= 0) |
5258 | next(remap(f)); |
5259 | } |
5260 | if (interactive) |
5261 | signal(SIGTERM, sig); |
5262 | |
5263 | if (signal(SIGINT, SIG_IGN) != SIG_IGN) |
5264 | signal(SIGINT, onintr); |
5265 | |
5266 | /* Handle "msh SCRIPT VAR=val params..." */ |
5267 | /* Disabled: bash does not do it! */ |
5268 | #if 0 |
5269 | argv++; |
5270 | /* skip leading args of the form VAR=val */ |
5271 | while (*argv && assign(*argv, !COPYV)) { |
5272 | argc--; |
5273 | argv++; |
5274 | } |
5275 | argv--; |
5276 | #endif |
5277 | dolv = argv; |
5278 | dolc = argc; |
5279 | dolv[0] = name; |
5280 | |
5281 | setval(lookup("#"), putn((--dolc < 0) ? (dolc = 0) : dolc)); |
5282 | |
5283 | DBGPRINTF(("MSH_MAIN: begin FOR loop, interactive %d, global_env.iop %p, iostack %p\n", interactive, global_env.iop, iostack)); |
5284 | |
5285 | for (;;) { |
5286 | if (interactive && global_env.iop <= iostack) { |
5287 | #if ENABLE_FEATURE_EDITING |
5288 | current_prompt = prompt->value; |
5289 | #else |
5290 | prs(prompt->value); |
5291 | #endif |
5292 | } |
5293 | onecommand(); |
5294 | /* Ensure that getenv("PATH") stays current */ |
5295 | setenv("PATH", path->value, 1); |
5296 | } |
5297 | |
5298 | DBGPRINTF(("MSH_MAIN: returning.\n")); |
5299 | } |
5300 | |
5301 | |
5302 | /* |
5303 | * Copyright (c) 1987,1997, Prentice Hall |
5304 | * All rights reserved. |
5305 | * |
5306 | * Redistribution and use of the MINIX operating system in source and |
5307 | * binary forms, with or without modification, are permitted provided |
5308 | * that the following conditions are met: |
5309 | * |
5310 | * Redistributions of source code must retain the above copyright |
5311 | * notice, this list of conditions and the following disclaimer. |
5312 | * |
5313 | * Redistributions in binary form must reproduce the above |
5314 | * copyright notice, this list of conditions and the following |
5315 | * disclaimer in the documentation and/or other materials provided |
5316 | * with the distribution. |
5317 | * |
5318 | * Neither the name of Prentice Hall nor the names of the software |
5319 | * authors or contributors may be used to endorse or promote |
5320 | * products derived from this software without specific prior |
5321 | * written permission. |
5322 | * |
5323 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, AND |
5324 | * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
5325 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
5326 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
5327 | * IN NO EVENT SHALL PRENTICE HALL OR ANY AUTHORS OR CONTRIBUTORS BE |
5328 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
5329 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
5330 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
5331 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
5332 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
5333 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
5334 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
5335 | * |
5336 | */ |