Annotation of /trunk/mkinitrd-magellan/busybox/shell/hush.c
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Revision 816 -
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Fri Apr 24 18:33:46 2009 UTC (15 years, 1 month ago) by niro
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Fri Apr 24 18:33:46 2009 UTC (15 years, 1 month ago) by niro
File MIME type: text/plain
File size: 136421 byte(s)
-updated to busybox-1.13.4
1 | niro | 532 | /* vi: set sw=4 ts=4: */ |
2 | /* | ||
3 | * sh.c -- a prototype Bourne shell grammar parser | ||
4 | * Intended to follow the original Thompson and Ritchie | ||
5 | * "small and simple is beautiful" philosophy, which | ||
6 | * incidentally is a good match to today's BusyBox. | ||
7 | * | ||
8 | * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org> | ||
9 | * | ||
10 | * Credits: | ||
11 | * The parser routines proper are all original material, first | ||
12 | * written Dec 2000 and Jan 2001 by Larry Doolittle. The | ||
13 | * execution engine, the builtins, and much of the underlying | ||
14 | * support has been adapted from busybox-0.49pre's lash, which is | ||
15 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> | ||
16 | * written by Erik Andersen <andersen@codepoet.org>. That, in turn, | ||
17 | * is based in part on ladsh.c, by Michael K. Johnson and Erik W. | ||
18 | * Troan, which they placed in the public domain. I don't know | ||
19 | * how much of the Johnson/Troan code has survived the repeated | ||
20 | * rewrites. | ||
21 | * | ||
22 | * Other credits: | ||
23 | niro | 816 | * o_addchr() derived from similar w_addchar function in glibc-2.2. |
24 | niro | 532 | * setup_redirect(), redirect_opt_num(), and big chunks of main() |
25 | niro | 816 | * and many builtins derived from contributions by Erik Andersen |
26 | * miscellaneous bugfixes from Matt Kraai. | ||
27 | niro | 532 | * |
28 | * There are two big (and related) architecture differences between | ||
29 | * this parser and the lash parser. One is that this version is | ||
30 | * actually designed from the ground up to understand nearly all | ||
31 | * of the Bourne grammar. The second, consequential change is that | ||
32 | * the parser and input reader have been turned inside out. Now, | ||
33 | * the parser is in control, and asks for input as needed. The old | ||
34 | * way had the input reader in control, and it asked for parsing to | ||
35 | * take place as needed. The new way makes it much easier to properly | ||
36 | * handle the recursion implicit in the various substitutions, especially | ||
37 | * across continuation lines. | ||
38 | * | ||
39 | * Bash grammar not implemented: (how many of these were in original sh?) | ||
40 | * $_ | ||
41 | * &> and >& redirection of stdout+stderr | ||
42 | * Brace Expansion | ||
43 | * Tilde Expansion | ||
44 | * fancy forms of Parameter Expansion | ||
45 | * aliases | ||
46 | * Arithmetic Expansion | ||
47 | * <(list) and >(list) Process Substitution | ||
48 | niro | 816 | * reserved words: select, function |
49 | niro | 532 | * Here Documents ( << word ) |
50 | * Functions | ||
51 | * Major bugs: | ||
52 | niro | 816 | * job handling woefully incomplete and buggy (improved --vda) |
53 | niro | 532 | * to-do: |
54 | * port selected bugfixes from post-0.49 busybox lash - done? | ||
55 | * change { and } from special chars to reserved words | ||
56 | niro | 816 | * builtins: return, trap, ulimit |
57 | * test magic exec with redirection only | ||
58 | niro | 532 | * check setting of global_argc and global_argv |
59 | * follow IFS rules more precisely, including update semantics | ||
60 | * figure out what to do with backslash-newline | ||
61 | * propagate syntax errors, die on resource errors? | ||
62 | * continuation lines, both explicit and implicit - done? | ||
63 | * memory leak finding and plugging - done? | ||
64 | niro | 816 | * maybe change charmap[] to use 2-bit entries |
65 | niro | 532 | * |
66 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. | ||
67 | */ | ||
68 | |||
69 | niro | 816 | #include "busybox.h" /* for APPLET_IS_NOFORK/NOEXEC */ |
70 | #include <glob.h> | ||
71 | /* #include <dmalloc.h> */ | ||
72 | #if ENABLE_HUSH_CASE | ||
73 | #include <fnmatch.h> | ||
74 | #endif | ||
75 | niro | 532 | |
76 | niro | 816 | #define HUSH_VER_STR "0.91" |
77 | niro | 532 | |
78 | niro | 816 | #if !BB_MMU && ENABLE_HUSH_TICK |
79 | //#undef ENABLE_HUSH_TICK | ||
80 | //#define ENABLE_HUSH_TICK 0 | ||
81 | #warning On NOMMU, hush command substitution is dangerous. | ||
82 | #warning Dont use it for commands which produce lots of output. | ||
83 | #warning For more info see shell/hush.c, generate_stream_from_list(). | ||
84 | #endif | ||
85 | niro | 532 | |
86 | niro | 816 | #if !BB_MMU && ENABLE_HUSH_JOB |
87 | #undef ENABLE_HUSH_JOB | ||
88 | #define ENABLE_HUSH_JOB 0 | ||
89 | #endif | ||
90 | niro | 532 | |
91 | niro | 816 | #if !ENABLE_HUSH_INTERACTIVE |
92 | #undef ENABLE_FEATURE_EDITING | ||
93 | #define ENABLE_FEATURE_EDITING 0 | ||
94 | #undef ENABLE_FEATURE_EDITING_FANCY_PROMPT | ||
95 | #define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0 | ||
96 | #endif | ||
97 | niro | 532 | |
98 | niro | 816 | |
99 | /* Keep unconditionally on for now */ | ||
100 | #define HUSH_DEBUG 1 | ||
101 | /* In progress... */ | ||
102 | #define ENABLE_HUSH_FUNCTIONS 0 | ||
103 | |||
104 | |||
105 | /* If you comment out one of these below, it will be #defined later | ||
106 | * to perform debug printfs to stderr: */ | ||
107 | #define debug_printf(...) do {} while (0) | ||
108 | /* Finer-grained debug switches */ | ||
109 | #define debug_printf_parse(...) do {} while (0) | ||
110 | #define debug_print_tree(a, b) do {} while (0) | ||
111 | #define debug_printf_exec(...) do {} while (0) | ||
112 | #define debug_printf_env(...) do {} while (0) | ||
113 | #define debug_printf_jobs(...) do {} while (0) | ||
114 | #define debug_printf_expand(...) do {} while (0) | ||
115 | #define debug_printf_glob(...) do {} while (0) | ||
116 | #define debug_printf_list(...) do {} while (0) | ||
117 | #define debug_printf_subst(...) do {} while (0) | ||
118 | #define debug_printf_clean(...) do {} while (0) | ||
119 | |||
120 | #ifndef debug_printf | ||
121 | #define debug_printf(...) fprintf(stderr, __VA_ARGS__) | ||
122 | #endif | ||
123 | |||
124 | #ifndef debug_printf_parse | ||
125 | #define debug_printf_parse(...) fprintf(stderr, __VA_ARGS__) | ||
126 | #endif | ||
127 | |||
128 | #ifndef debug_printf_exec | ||
129 | #define debug_printf_exec(...) fprintf(stderr, __VA_ARGS__) | ||
130 | #endif | ||
131 | |||
132 | #ifndef debug_printf_env | ||
133 | #define debug_printf_env(...) fprintf(stderr, __VA_ARGS__) | ||
134 | #endif | ||
135 | |||
136 | #ifndef debug_printf_jobs | ||
137 | #define debug_printf_jobs(...) fprintf(stderr, __VA_ARGS__) | ||
138 | #define DEBUG_JOBS 1 | ||
139 | #else | ||
140 | #define DEBUG_JOBS 0 | ||
141 | #endif | ||
142 | |||
143 | #ifndef debug_printf_expand | ||
144 | #define debug_printf_expand(...) fprintf(stderr, __VA_ARGS__) | ||
145 | #define DEBUG_EXPAND 1 | ||
146 | #else | ||
147 | #define DEBUG_EXPAND 0 | ||
148 | #endif | ||
149 | |||
150 | #ifndef debug_printf_glob | ||
151 | #define debug_printf_glob(...) fprintf(stderr, __VA_ARGS__) | ||
152 | #define DEBUG_GLOB 1 | ||
153 | #else | ||
154 | #define DEBUG_GLOB 0 | ||
155 | #endif | ||
156 | |||
157 | #ifndef debug_printf_list | ||
158 | #define debug_printf_list(...) fprintf(stderr, __VA_ARGS__) | ||
159 | #endif | ||
160 | |||
161 | #ifndef debug_printf_subst | ||
162 | #define debug_printf_subst(...) fprintf(stderr, __VA_ARGS__) | ||
163 | #endif | ||
164 | |||
165 | #ifndef debug_printf_clean | ||
166 | /* broken, of course, but OK for testing */ | ||
167 | static const char *indenter(int i) | ||
168 | { | ||
169 | static const char blanks[] ALIGN1 = | ||
170 | " "; | ||
171 | return &blanks[sizeof(blanks) - i - 1]; | ||
172 | } | ||
173 | #define debug_printf_clean(...) fprintf(stderr, __VA_ARGS__) | ||
174 | #define DEBUG_CLEAN 1 | ||
175 | #endif | ||
176 | |||
177 | #if DEBUG_EXPAND | ||
178 | static void debug_print_strings(const char *prefix, char **vv) | ||
179 | { | ||
180 | fprintf(stderr, "%s:\n", prefix); | ||
181 | while (*vv) | ||
182 | fprintf(stderr, " '%s'\n", *vv++); | ||
183 | } | ||
184 | #else | ||
185 | #define debug_print_strings(prefix, vv) ((void)0) | ||
186 | #endif | ||
187 | |||
188 | /* | ||
189 | * Leak hunting. Use hush_leaktool.sh for post-processing. | ||
190 | */ | ||
191 | #ifdef FOR_HUSH_LEAKTOOL | ||
192 | /* suppress "warning: no previous prototype..." */ | ||
193 | void *xxmalloc(int lineno, size_t size); | ||
194 | void *xxrealloc(int lineno, void *ptr, size_t size); | ||
195 | char *xxstrdup(int lineno, const char *str); | ||
196 | void xxfree(void *ptr); | ||
197 | void *xxmalloc(int lineno, size_t size) | ||
198 | { | ||
199 | void *ptr = xmalloc((size + 0xff) & ~0xff); | ||
200 | fprintf(stderr, "line %d: malloc %p\n", lineno, ptr); | ||
201 | return ptr; | ||
202 | } | ||
203 | void *xxrealloc(int lineno, void *ptr, size_t size) | ||
204 | { | ||
205 | ptr = xrealloc(ptr, (size + 0xff) & ~0xff); | ||
206 | fprintf(stderr, "line %d: realloc %p\n", lineno, ptr); | ||
207 | return ptr; | ||
208 | } | ||
209 | char *xxstrdup(int lineno, const char *str) | ||
210 | { | ||
211 | char *ptr = xstrdup(str); | ||
212 | fprintf(stderr, "line %d: strdup %p\n", lineno, ptr); | ||
213 | return ptr; | ||
214 | } | ||
215 | void xxfree(void *ptr) | ||
216 | { | ||
217 | fprintf(stderr, "free %p\n", ptr); | ||
218 | free(ptr); | ||
219 | } | ||
220 | #define xmalloc(s) xxmalloc(__LINE__, s) | ||
221 | #define xrealloc(p, s) xxrealloc(__LINE__, p, s) | ||
222 | #define xstrdup(s) xxstrdup(__LINE__, s) | ||
223 | #define free(p) xxfree(p) | ||
224 | #endif | ||
225 | |||
226 | |||
227 | /* Do we support ANY keywords? */ | ||
228 | #if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE | ||
229 | #define HAS_KEYWORDS 1 | ||
230 | #define IF_HAS_KEYWORDS(...) __VA_ARGS__ | ||
231 | #define IF_HAS_NO_KEYWORDS(...) | ||
232 | #else | ||
233 | #define HAS_KEYWORDS 0 | ||
234 | #define IF_HAS_KEYWORDS(...) | ||
235 | #define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__ | ||
236 | #endif | ||
237 | |||
238 | |||
239 | #define SPECIAL_VAR_SYMBOL 3 | ||
240 | #define PARSEFLAG_EXIT_FROM_LOOP 1 | ||
241 | |||
242 | typedef enum redir_type { | ||
243 | niro | 532 | REDIRECT_INPUT = 1, |
244 | REDIRECT_OVERWRITE = 2, | ||
245 | REDIRECT_APPEND = 3, | ||
246 | REDIRECT_HEREIS = 4, | ||
247 | REDIRECT_IO = 5 | ||
248 | } redir_type; | ||
249 | |||
250 | niro | 816 | /* The descrip member of this structure is only used to make |
251 | * debugging output pretty */ | ||
252 | static const struct { | ||
253 | int mode; | ||
254 | signed char default_fd; | ||
255 | char descrip[3]; | ||
256 | } redir_table[] = { | ||
257 | niro | 532 | { 0, 0, "()" }, |
258 | { O_RDONLY, 0, "<" }, | ||
259 | { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" }, | ||
260 | { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" }, | ||
261 | { O_RDONLY, -1, "<<" }, | ||
262 | { O_RDWR, 1, "<>" } | ||
263 | }; | ||
264 | |||
265 | niro | 816 | typedef enum pipe_style { |
266 | niro | 532 | PIPE_SEQ = 1, |
267 | PIPE_AND = 2, | ||
268 | PIPE_OR = 3, | ||
269 | PIPE_BG = 4, | ||
270 | } pipe_style; | ||
271 | |||
272 | niro | 816 | typedef enum reserved_style { |
273 | niro | 532 | RES_NONE = 0, |
274 | niro | 816 | #if ENABLE_HUSH_IF |
275 | RES_IF , | ||
276 | RES_THEN , | ||
277 | RES_ELIF , | ||
278 | RES_ELSE , | ||
279 | RES_FI , | ||
280 | #endif | ||
281 | #if ENABLE_HUSH_LOOPS | ||
282 | RES_FOR , | ||
283 | RES_WHILE , | ||
284 | RES_UNTIL , | ||
285 | RES_DO , | ||
286 | RES_DONE , | ||
287 | #endif | ||
288 | #if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE | ||
289 | RES_IN , | ||
290 | #endif | ||
291 | #if ENABLE_HUSH_CASE | ||
292 | RES_CASE , | ||
293 | /* two pseudo-keywords support contrived "case" syntax: */ | ||
294 | RES_MATCH , /* "word)" */ | ||
295 | RES_CASEI , /* "this command is inside CASE" */ | ||
296 | RES_ESAC , | ||
297 | #endif | ||
298 | RES_XXXX , | ||
299 | RES_SNTX | ||
300 | niro | 532 | } reserved_style; |
301 | |||
302 | struct redir_struct { | ||
303 | niro | 816 | struct redir_struct *next; |
304 | char *rd_filename; /* filename */ | ||
305 | int fd; /* file descriptor being redirected */ | ||
306 | int dup; /* -1, or file descriptor being duplicated */ | ||
307 | smallint /*enum redir_type*/ rd_type; | ||
308 | niro | 532 | }; |
309 | |||
310 | niro | 816 | struct command { |
311 | pid_t pid; /* 0 if exited */ | ||
312 | int assignment_cnt; /* how many argv[i] are assignments? */ | ||
313 | smallint is_stopped; /* is the command currently running? */ | ||
314 | smallint grp_type; | ||
315 | struct pipe *group; /* if non-NULL, this "prog" is {} group, | ||
316 | * subshell, or a compound statement */ | ||
317 | char **argv; /* command name and arguments */ | ||
318 | struct redir_struct *redirects; /* I/O redirections */ | ||
319 | niro | 532 | }; |
320 | niro | 816 | /* argv vector may contain variable references (^Cvar^C, ^C0^C etc) |
321 | * and on execution these are substituted with their values. | ||
322 | * Substitution can make _several_ words out of one argv[n]! | ||
323 | * Example: argv[0]=='.^C*^C.' here: echo .$*. | ||
324 | * References of the form ^C`cmd arg^C are `cmd arg` substitutions. | ||
325 | */ | ||
326 | #define GRP_NORMAL 0 | ||
327 | #define GRP_SUBSHELL 1 | ||
328 | #if ENABLE_HUSH_FUNCTIONS | ||
329 | #define GRP_FUNCTION 2 | ||
330 | #endif | ||
331 | niro | 532 | |
332 | struct pipe { | ||
333 | niro | 816 | struct pipe *next; |
334 | int num_cmds; /* total number of commands in job */ | ||
335 | int alive_cmds; /* number of commands running (not exited) */ | ||
336 | int stopped_cmds; /* number of commands alive, but stopped */ | ||
337 | #if ENABLE_HUSH_JOB | ||
338 | int jobid; /* job number */ | ||
339 | pid_t pgrp; /* process group ID for the job */ | ||
340 | char *cmdtext; /* name of job */ | ||
341 | #endif | ||
342 | struct command *cmds; /* array of commands in pipe */ | ||
343 | smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */ | ||
344 | IF_HAS_KEYWORDS(smallint pi_inverted;) /* "! cmd | cmd" */ | ||
345 | IF_HAS_KEYWORDS(smallint res_word;) /* needed for if, for, while, until... */ | ||
346 | niro | 532 | }; |
347 | |||
348 | niro | 816 | /* This holds pointers to the various results of parsing */ |
349 | struct parse_context { | ||
350 | struct command *command; | ||
351 | struct pipe *list_head; | ||
352 | struct pipe *pipe; | ||
353 | struct redir_struct *pending_redirect; | ||
354 | #if HAS_KEYWORDS | ||
355 | smallint ctx_res_w; | ||
356 | smallint ctx_inverted; /* "! cmd | cmd" */ | ||
357 | #if ENABLE_HUSH_CASE | ||
358 | smallint ctx_dsemicolon; /* ";;" seen */ | ||
359 | #endif | ||
360 | int old_flag; /* bitmask of FLAG_xxx, for figuring out valid reserved words */ | ||
361 | struct parse_context *stack; | ||
362 | #endif | ||
363 | niro | 532 | }; |
364 | |||
365 | niro | 816 | /* On program start, environ points to initial environment. |
366 | * putenv adds new pointers into it, unsetenv removes them. | ||
367 | * Neither of these (de)allocates the strings. | ||
368 | * setenv allocates new strings in malloc space and does putenv, | ||
369 | * and thus setenv is unusable (leaky) for shell's purposes */ | ||
370 | #define setenv(...) setenv_is_leaky_dont_use() | ||
371 | struct variable { | ||
372 | struct variable *next; | ||
373 | char *varstr; /* points to "name=" portion */ | ||
374 | int max_len; /* if > 0, name is part of initial env; else name is malloced */ | ||
375 | smallint flg_export; /* putenv should be done on this var */ | ||
376 | smallint flg_read_only; | ||
377 | niro | 532 | }; |
378 | |||
379 | niro | 816 | typedef struct o_string { |
380 | niro | 532 | char *data; |
381 | niro | 816 | int length; /* position where data is appended */ |
382 | niro | 532 | int maxlen; |
383 | niro | 816 | /* Misnomer! it's not "quoting", it's "protection against globbing"! |
384 | * (by prepending \ to *, ?, [ and to \ too) */ | ||
385 | smallint o_quote; | ||
386 | smallint o_glob; | ||
387 | smallint nonnull; | ||
388 | smallint has_empty_slot; | ||
389 | smallint o_assignment; /* 0:maybe, 1:yes, 2:no */ | ||
390 | niro | 532 | } o_string; |
391 | niro | 816 | enum { |
392 | MAYBE_ASSIGNMENT = 0, | ||
393 | DEFINITELY_ASSIGNMENT = 1, | ||
394 | NOT_ASSIGNMENT = 2, | ||
395 | WORD_IS_KEYWORD = 3, /* not assigment, but next word may be: "if v=xyz cmd;" */ | ||
396 | }; | ||
397 | /* Used for initialization: o_string foo = NULL_O_STRING; */ | ||
398 | #define NULL_O_STRING { NULL } | ||
399 | niro | 532 | |
400 | niro | 816 | /* I can almost use ordinary FILE*. Is open_memstream() universally |
401 | niro | 532 | * available? Where is it documented? */ |
402 | niro | 816 | typedef struct in_str { |
403 | niro | 532 | const char *p; |
404 | niro | 816 | /* eof_flag=1: last char in ->p is really an EOF */ |
405 | char eof_flag; /* meaningless if ->p == NULL */ | ||
406 | niro | 532 | char peek_buf[2]; |
407 | niro | 816 | #if ENABLE_HUSH_INTERACTIVE |
408 | smallint promptme; | ||
409 | smallint promptmode; /* 0: PS1, 1: PS2 */ | ||
410 | #endif | ||
411 | niro | 532 | FILE *file; |
412 | int (*get) (struct in_str *); | ||
413 | int (*peek) (struct in_str *); | ||
414 | niro | 816 | } in_str; |
415 | #define i_getch(input) ((input)->get(input)) | ||
416 | #define i_peek(input) ((input)->peek(input)) | ||
417 | |||
418 | enum { | ||
419 | CHAR_ORDINARY = 0, | ||
420 | CHAR_ORDINARY_IF_QUOTED = 1, /* example: *, # */ | ||
421 | CHAR_IFS = 2, /* treated as ordinary if quoted */ | ||
422 | CHAR_SPECIAL = 3, /* example: $ */ | ||
423 | niro | 532 | }; |
424 | |||
425 | niro | 816 | enum { |
426 | BC_BREAK = 1, | ||
427 | BC_CONTINUE = 2, | ||
428 | }; | ||
429 | niro | 532 | |
430 | niro | 816 | |
431 | /* "Globals" within this file */ | ||
432 | |||
433 | /* Sorted roughly by size (smaller offsets == smaller code) */ | ||
434 | struct globals { | ||
435 | #if ENABLE_HUSH_INTERACTIVE | ||
436 | /* 'interactive_fd' is a fd# open to ctty, if we have one | ||
437 | * _AND_ if we decided to act interactively */ | ||
438 | int interactive_fd; | ||
439 | const char *PS1; | ||
440 | const char *PS2; | ||
441 | #endif | ||
442 | #if ENABLE_FEATURE_EDITING | ||
443 | line_input_t *line_input_state; | ||
444 | #endif | ||
445 | pid_t root_pid; | ||
446 | pid_t last_bg_pid; | ||
447 | #if ENABLE_HUSH_JOB | ||
448 | int run_list_level; | ||
449 | pid_t saved_tty_pgrp; | ||
450 | int last_jobid; | ||
451 | struct pipe *job_list; | ||
452 | struct pipe *toplevel_list; | ||
453 | smallint ctrl_z_flag; | ||
454 | #endif | ||
455 | #if ENABLE_HUSH_LOOPS | ||
456 | smallint flag_break_continue; | ||
457 | #endif | ||
458 | smallint fake_mode; | ||
459 | /* these three support $?, $#, and $1 */ | ||
460 | smalluint last_return_code; | ||
461 | /* is global_argv and global_argv[1..n] malloced? (note: not [0]) */ | ||
462 | smalluint global_args_malloced; | ||
463 | /* how many non-NULL argv's we have. NB: $# + 1 */ | ||
464 | int global_argc; | ||
465 | char **global_argv; | ||
466 | #if ENABLE_HUSH_LOOPS | ||
467 | unsigned depth_break_continue; | ||
468 | unsigned depth_of_loop; | ||
469 | #endif | ||
470 | const char *ifs; | ||
471 | const char *cwd; | ||
472 | struct variable *top_var; /* = &G.shell_ver (set in main()) */ | ||
473 | struct variable shell_ver; | ||
474 | #if ENABLE_FEATURE_SH_STANDALONE | ||
475 | struct nofork_save_area nofork_save; | ||
476 | #endif | ||
477 | #if ENABLE_HUSH_JOB | ||
478 | sigjmp_buf toplevel_jb; | ||
479 | #endif | ||
480 | unsigned char charmap[256]; | ||
481 | char user_input_buf[ENABLE_FEATURE_EDITING ? BUFSIZ : 2]; | ||
482 | niro | 532 | }; |
483 | |||
484 | niro | 816 | #define G (*ptr_to_globals) |
485 | /* Not #defining name to G.name - this quickly gets unwieldy | ||
486 | * (too many defines). Also, I actually prefer to see when a variable | ||
487 | * is global, thus "G." prefix is a useful hint */ | ||
488 | #define INIT_G() do { \ | ||
489 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ | ||
490 | } while (0) | ||
491 | niro | 532 | |
492 | niro | 816 | |
493 | #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n" | ||
494 | |||
495 | #if 1 | ||
496 | /* Normal */ | ||
497 | static void syntax(const char *msg) | ||
498 | niro | 532 | { |
499 | niro | 816 | #if ENABLE_HUSH_INTERACTIVE |
500 | /* Was using fancy stuff: | ||
501 | * (G.interactive_fd ? bb_error_msg : bb_error_msg_and_die)(...params...) | ||
502 | * but it SEGVs. ?! Oh well... explicit temp ptr works around that */ | ||
503 | void FAST_FUNC (*fp)(const char *s, ...); | ||
504 | fp = (G.interactive_fd ? bb_error_msg : bb_error_msg_and_die); | ||
505 | fp(msg ? "%s: %s" : "syntax error", "syntax error", msg); | ||
506 | #else | ||
507 | bb_error_msg_and_die(msg ? "%s: %s" : "syntax error", "syntax error", msg); | ||
508 | #endif | ||
509 | niro | 532 | } |
510 | niro | 816 | |
511 | #else | ||
512 | /* Debug */ | ||
513 | static void syntax_lineno(int line) | ||
514 | niro | 532 | { |
515 | niro | 816 | #if ENABLE_HUSH_INTERACTIVE |
516 | void FAST_FUNC (*fp)(const char *s, ...); | ||
517 | fp = (G.interactive_fd ? bb_error_msg : bb_error_msg_and_die); | ||
518 | fp("syntax error hush.c:%d", line); | ||
519 | niro | 532 | #else |
520 | niro | 816 | bb_error_msg_and_die("syntax error hush.c:%d", line); |
521 | niro | 532 | #endif |
522 | } | ||
523 | niro | 816 | #define syntax(str) syntax_lineno(__LINE__) |
524 | #endif | ||
525 | niro | 532 | |
526 | /* Index of subroutines: */ | ||
527 | /* in_str manipulations: */ | ||
528 | static int static_get(struct in_str *i); | ||
529 | static int static_peek(struct in_str *i); | ||
530 | static int file_get(struct in_str *i); | ||
531 | static int file_peek(struct in_str *i); | ||
532 | static void setup_file_in_str(struct in_str *i, FILE *f); | ||
533 | static void setup_string_in_str(struct in_str *i, const char *s); | ||
534 | /* "run" the final data structures: */ | ||
535 | niro | 816 | #if !defined(DEBUG_CLEAN) |
536 | #define free_pipe_list(head, indent) free_pipe_list(head) | ||
537 | #define free_pipe(pi, indent) free_pipe(pi) | ||
538 | #endif | ||
539 | niro | 532 | static int free_pipe_list(struct pipe *head, int indent); |
540 | static int free_pipe(struct pipe *pi, int indent); | ||
541 | /* really run the final data structures: */ | ||
542 | niro | 816 | typedef struct nommu_save_t { |
543 | char **new_env; | ||
544 | char **old_env; | ||
545 | char **argv; | ||
546 | } nommu_save_t; | ||
547 | #if BB_MMU | ||
548 | #define pseudo_exec_argv(nommu_save, argv, assignment_cnt, argv_expanded) \ | ||
549 | pseudo_exec_argv(argv, assignment_cnt, argv_expanded) | ||
550 | #define pseudo_exec(nommu_save, command, argv_expanded) \ | ||
551 | pseudo_exec(command, argv_expanded) | ||
552 | #endif | ||
553 | static void pseudo_exec_argv(nommu_save_t *nommu_save, char **argv, int assignment_cnt, char **argv_expanded) NORETURN; | ||
554 | static void pseudo_exec(nommu_save_t *nommu_save, struct command *command, char **argv_expanded) NORETURN; | ||
555 | static int setup_redirects(struct command *prog, int squirrel[]); | ||
556 | static int run_list(struct pipe *pi); | ||
557 | static int run_pipe(struct pipe *pi); | ||
558 | niro | 532 | /* data structure manipulation: */ |
559 | niro | 816 | static int setup_redirect(struct parse_context *ctx, int fd, redir_type style, struct in_str *input); |
560 | static void initialize_context(struct parse_context *ctx); | ||
561 | static int done_word(o_string *dest, struct parse_context *ctx); | ||
562 | static int done_command(struct parse_context *ctx); | ||
563 | static void done_pipe(struct parse_context *ctx, pipe_style type); | ||
564 | niro | 532 | /* primary string parsing: */ |
565 | static int redirect_dup_num(struct in_str *input); | ||
566 | static int redirect_opt_num(o_string *o); | ||
567 | niro | 816 | #if ENABLE_HUSH_TICK |
568 | static int process_command_subs(o_string *dest, | ||
569 | struct in_str *input, const char *subst_end); | ||
570 | #endif | ||
571 | static int parse_group(o_string *dest, struct parse_context *ctx, struct in_str *input, int ch); | ||
572 | static const char *lookup_param(const char *src); | ||
573 | static int handle_dollar(o_string *dest, | ||
574 | struct in_str *input); | ||
575 | static int parse_stream(o_string *dest, struct parse_context *ctx, struct in_str *input0, const char *end_trigger); | ||
576 | niro | 532 | /* setup: */ |
577 | niro | 816 | static int parse_and_run_stream(struct in_str *inp, int parse_flag); |
578 | static int parse_and_run_string(const char *s, int parse_flag); | ||
579 | static int parse_and_run_file(FILE *f); | ||
580 | niro | 532 | /* job management: */ |
581 | static int checkjobs(struct pipe* fg_pipe); | ||
582 | niro | 816 | #if ENABLE_HUSH_JOB |
583 | static int checkjobs_and_fg_shell(struct pipe* fg_pipe); | ||
584 | niro | 532 | static void insert_bg_job(struct pipe *pi); |
585 | static void remove_bg_job(struct pipe *pi); | ||
586 | niro | 816 | static void delete_finished_bg_job(struct pipe *pi); |
587 | #else | ||
588 | int checkjobs_and_fg_shell(struct pipe* fg_pipe); /* never called */ | ||
589 | #endif | ||
590 | niro | 532 | /* local variable support */ |
591 | niro | 816 | static char **expand_strvec_to_strvec(char **argv); |
592 | /* used for eval */ | ||
593 | static char *expand_strvec_to_string(char **argv); | ||
594 | /* used for expansion of right hand of assignments */ | ||
595 | static char *expand_string_to_string(const char *str); | ||
596 | static struct variable *get_local_var(const char *name); | ||
597 | static int set_local_var(char *str, int flg_export); | ||
598 | static void unset_local_var(const char *name); | ||
599 | niro | 532 | |
600 | |||
601 | niro | 816 | static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="HUSH_VER_STR; |
602 | |||
603 | |||
604 | static int glob_needed(const char *s) | ||
605 | niro | 532 | { |
606 | niro | 816 | while (*s) { |
607 | if (*s == '\\') | ||
608 | s++; | ||
609 | if (*s == '*' || *s == '[' || *s == '?') | ||
610 | return 1; | ||
611 | s++; | ||
612 | } | ||
613 | return 0; | ||
614 | niro | 532 | } |
615 | |||
616 | niro | 816 | static int is_assignment(const char *s) |
617 | niro | 532 | { |
618 | niro | 816 | if (!s || !(isalpha(*s) || *s == '_')) |
619 | return 0; | ||
620 | s++; | ||
621 | while (isalnum(*s) || *s == '_') | ||
622 | s++; | ||
623 | return *s == '='; | ||
624 | niro | 532 | } |
625 | |||
626 | niro | 816 | /* Replace each \x with x in place, return ptr past NUL. */ |
627 | static char *unbackslash(char *src) | ||
628 | niro | 532 | { |
629 | niro | 816 | char *dst = src; |
630 | while (1) { | ||
631 | if (*src == '\\') | ||
632 | src++; | ||
633 | if ((*dst++ = *src++) == '\0') | ||
634 | break; | ||
635 | niro | 532 | } |
636 | niro | 816 | return dst; |
637 | niro | 532 | } |
638 | |||
639 | niro | 816 | static char **add_strings_to_strings(char **strings, char **add, int need_to_dup) |
640 | niro | 532 | { |
641 | niro | 816 | int i; |
642 | unsigned count1; | ||
643 | unsigned count2; | ||
644 | char **v; | ||
645 | |||
646 | v = strings; | ||
647 | count1 = 0; | ||
648 | if (v) { | ||
649 | while (*v) { | ||
650 | count1++; | ||
651 | v++; | ||
652 | } | ||
653 | niro | 532 | } |
654 | niro | 816 | count2 = 0; |
655 | v = add; | ||
656 | while (*v) { | ||
657 | count2++; | ||
658 | v++; | ||
659 | } | ||
660 | v = xrealloc(strings, (count1 + count2 + 1) * sizeof(char*)); | ||
661 | v[count1 + count2] = NULL; | ||
662 | i = count2; | ||
663 | while (--i >= 0) | ||
664 | v[count1 + i] = (need_to_dup ? xstrdup(add[i]) : add[i]); | ||
665 | return v; | ||
666 | niro | 532 | } |
667 | |||
668 | niro | 816 | static char **add_string_to_strings(char **strings, char *add) |
669 | niro | 532 | { |
670 | niro | 816 | char *v[2]; |
671 | v[0] = add; | ||
672 | v[1] = NULL; | ||
673 | return add_strings_to_strings(strings, v, /*dup:*/ 0); | ||
674 | niro | 532 | } |
675 | |||
676 | niro | 816 | static void putenv_all(char **strings) |
677 | niro | 532 | { |
678 | niro | 816 | if (!strings) |
679 | return; | ||
680 | while (*strings) { | ||
681 | debug_printf_env("putenv '%s'\n", *strings); | ||
682 | putenv(*strings++); | ||
683 | } | ||
684 | niro | 532 | } |
685 | |||
686 | niro | 816 | static char **putenv_all_and_save_old(char **strings) |
687 | niro | 532 | { |
688 | niro | 816 | char **old = NULL; |
689 | char **s = strings; | ||
690 | niro | 532 | |
691 | niro | 816 | if (!strings) |
692 | return old; | ||
693 | while (*strings) { | ||
694 | char *v, *eq; | ||
695 | niro | 532 | |
696 | niro | 816 | eq = strchr(*strings, '='); |
697 | if (eq) { | ||
698 | *eq = '\0'; | ||
699 | v = getenv(*strings); | ||
700 | *eq = '='; | ||
701 | if (v) { | ||
702 | /* v points to VAL in VAR=VAL, go back to VAR */ | ||
703 | v -= (eq - *strings) + 1; | ||
704 | old = add_string_to_strings(old, v); | ||
705 | niro | 532 | } |
706 | } | ||
707 | niro | 816 | strings++; |
708 | niro | 532 | } |
709 | niro | 816 | putenv_all(s); |
710 | return old; | ||
711 | niro | 532 | } |
712 | |||
713 | niro | 816 | static void free_strings_and_unsetenv(char **strings, int unset) |
714 | niro | 532 | { |
715 | niro | 816 | char **v; |
716 | niro | 532 | |
717 | niro | 816 | if (!strings) |
718 | return; | ||
719 | |||
720 | v = strings; | ||
721 | while (*v) { | ||
722 | if (unset) { | ||
723 | char *copy; | ||
724 | /* *strchrnul(*v, '=') = '\0'; -- BAD | ||
725 | * In case *v was putenv'ed, we can't | ||
726 | * unsetenv(*v) after taking out '=': | ||
727 | * it won't work, env is modified by taking out! | ||
728 | * horror :( */ | ||
729 | copy = xstrndup(*v, strchrnul(*v, '=') - *v); | ||
730 | debug_printf_env("unsetenv '%s'\n", copy); | ||
731 | unsetenv(copy); | ||
732 | free(copy); | ||
733 | niro | 532 | } |
734 | niro | 816 | free(*v++); |
735 | niro | 532 | } |
736 | niro | 816 | free(strings); |
737 | } | ||
738 | niro | 532 | |
739 | niro | 816 | static void free_strings(char **strings) |
740 | { | ||
741 | free_strings_and_unsetenv(strings, 0); | ||
742 | } | ||
743 | niro | 532 | |
744 | |||
745 | niro | 816 | /* Function prototypes for builtins */ |
746 | static int builtin_cd(char **argv); | ||
747 | static int builtin_echo(char **argv); | ||
748 | static int builtin_eval(char **argv); | ||
749 | static int builtin_exec(char **argv); | ||
750 | static int builtin_exit(char **argv); | ||
751 | static int builtin_export(char **argv); | ||
752 | #if ENABLE_HUSH_JOB | ||
753 | static int builtin_fg_bg(char **argv); | ||
754 | static int builtin_jobs(char **argv); | ||
755 | #endif | ||
756 | #if ENABLE_HUSH_HELP | ||
757 | static int builtin_help(char **argv); | ||
758 | #endif | ||
759 | static int builtin_pwd(char **argv); | ||
760 | static int builtin_read(char **argv); | ||
761 | static int builtin_test(char **argv); | ||
762 | static int builtin_true(char **argv); | ||
763 | static int builtin_set(char **argv); | ||
764 | static int builtin_shift(char **argv); | ||
765 | static int builtin_source(char **argv); | ||
766 | static int builtin_umask(char **argv); | ||
767 | static int builtin_unset(char **argv); | ||
768 | #if ENABLE_HUSH_LOOPS | ||
769 | static int builtin_break(char **argv); | ||
770 | static int builtin_continue(char **argv); | ||
771 | #endif | ||
772 | //static int builtin_not_written(char **argv); | ||
773 | niro | 532 | |
774 | niro | 816 | /* Table of built-in functions. They can be forked or not, depending on |
775 | * context: within pipes, they fork. As simple commands, they do not. | ||
776 | * When used in non-forking context, they can change global variables | ||
777 | * in the parent shell process. If forked, of course they cannot. | ||
778 | * For example, 'unset foo | whatever' will parse and run, but foo will | ||
779 | * still be set at the end. */ | ||
780 | struct built_in_command { | ||
781 | const char *cmd; | ||
782 | int (*function)(char **argv); | ||
783 | #if ENABLE_HUSH_HELP | ||
784 | const char *descr; | ||
785 | #define BLTIN(cmd, func, help) { cmd, func, help } | ||
786 | #else | ||
787 | #define BLTIN(cmd, func, help) { cmd, func } | ||
788 | #endif | ||
789 | }; | ||
790 | niro | 532 | |
791 | niro | 816 | /* For now, echo and test are unconditionally enabled. |
792 | * Maybe make it configurable? */ | ||
793 | static const struct built_in_command bltins[] = { | ||
794 | BLTIN("." , builtin_source, "Run commands in a file"), | ||
795 | BLTIN(":" , builtin_true, "No-op"), | ||
796 | BLTIN("[" , builtin_test, "Test condition"), | ||
797 | BLTIN("[[" , builtin_test, "Test condition"), | ||
798 | #if ENABLE_HUSH_JOB | ||
799 | BLTIN("bg" , builtin_fg_bg, "Resume a job in the background"), | ||
800 | #endif | ||
801 | #if ENABLE_HUSH_LOOPS | ||
802 | BLTIN("break" , builtin_break, "Exit from a loop"), | ||
803 | #endif | ||
804 | BLTIN("cd" , builtin_cd, "Change directory"), | ||
805 | #if ENABLE_HUSH_LOOPS | ||
806 | BLTIN("continue", builtin_continue, "Start new loop iteration"), | ||
807 | #endif | ||
808 | BLTIN("echo" , builtin_echo, "Write to stdout"), | ||
809 | BLTIN("eval" , builtin_eval, "Construct and run shell command"), | ||
810 | BLTIN("exec" , builtin_exec, "Execute command, don't return to shell"), | ||
811 | BLTIN("exit" , builtin_exit, "Exit"), | ||
812 | BLTIN("export", builtin_export, "Set environment variable"), | ||
813 | #if ENABLE_HUSH_JOB | ||
814 | BLTIN("fg" , builtin_fg_bg, "Bring job into the foreground"), | ||
815 | BLTIN("jobs" , builtin_jobs, "List active jobs"), | ||
816 | #endif | ||
817 | BLTIN("pwd" , builtin_pwd, "Print current directory"), | ||
818 | BLTIN("read" , builtin_read, "Input environment variable"), | ||
819 | // BLTIN("return", builtin_not_written, "Return from a function"), | ||
820 | BLTIN("set" , builtin_set, "Set/unset shell local variables"), | ||
821 | BLTIN("shift" , builtin_shift, "Shift positional parameters"), | ||
822 | // BLTIN("trap" , builtin_not_written, "Trap signals"), | ||
823 | BLTIN("test" , builtin_test, "Test condition"), | ||
824 | // BLTIN("ulimit", builtin_not_written, "Control resource limits"), | ||
825 | BLTIN("umask" , builtin_umask, "Set file creation mask"), | ||
826 | BLTIN("unset" , builtin_unset, "Unset environment variable"), | ||
827 | #if ENABLE_HUSH_HELP | ||
828 | BLTIN("help" , builtin_help, "List shell built-in commands"), | ||
829 | #endif | ||
830 | }; | ||
831 | niro | 532 | |
832 | |||
833 | niro | 816 | /* Signals are grouped, we handle them in batches */ |
834 | static void set_misc_sighandler(void (*handler)(int)) | ||
835 | niro | 532 | { |
836 | niro | 816 | bb_signals(0 |
837 | + (1 << SIGINT) | ||
838 | + (1 << SIGQUIT) | ||
839 | + (1 << SIGTERM) | ||
840 | , handler); | ||
841 | } | ||
842 | niro | 532 | |
843 | niro | 816 | #if ENABLE_HUSH_JOB |
844 | niro | 532 | |
845 | niro | 816 | static void set_fatal_sighandler(void (*handler)(int)) |
846 | { | ||
847 | bb_signals(0 | ||
848 | + (1 << SIGILL) | ||
849 | + (1 << SIGTRAP) | ||
850 | + (1 << SIGABRT) | ||
851 | + (1 << SIGFPE) | ||
852 | + (1 << SIGBUS) | ||
853 | + (1 << SIGSEGV) | ||
854 | /* bash 3.2 seems to handle these just like 'fatal' ones */ | ||
855 | + (1 << SIGHUP) | ||
856 | + (1 << SIGPIPE) | ||
857 | + (1 << SIGALRM) | ||
858 | , handler); | ||
859 | niro | 532 | } |
860 | niro | 816 | static void set_jobctrl_sighandler(void (*handler)(int)) |
861 | { | ||
862 | bb_signals(0 | ||
863 | + (1 << SIGTSTP) | ||
864 | + (1 << SIGTTIN) | ||
865 | + (1 << SIGTTOU) | ||
866 | , handler); | ||
867 | } | ||
868 | /* SIGCHLD is special and handled separately */ | ||
869 | niro | 532 | |
870 | niro | 816 | static void set_every_sighandler(void (*handler)(int)) |
871 | { | ||
872 | set_fatal_sighandler(handler); | ||
873 | set_jobctrl_sighandler(handler); | ||
874 | set_misc_sighandler(handler); | ||
875 | signal(SIGCHLD, handler); | ||
876 | } | ||
877 | niro | 532 | |
878 | niro | 816 | static void handler_ctrl_c(int sig UNUSED_PARAM) |
879 | niro | 532 | { |
880 | niro | 816 | debug_printf_jobs("got sig %d\n", sig); |
881 | // as usual we can have all kinds of nasty problems with leaked malloc data here | ||
882 | siglongjmp(G.toplevel_jb, 1); | ||
883 | niro | 532 | } |
884 | |||
885 | niro | 816 | static void handler_ctrl_z(int sig UNUSED_PARAM) |
886 | niro | 532 | { |
887 | niro | 816 | pid_t pid; |
888 | niro | 532 | |
889 | niro | 816 | debug_printf_jobs("got tty sig %d in pid %d\n", sig, getpid()); |
890 | pid = fork(); | ||
891 | if (pid < 0) /* can't fork. Pretend there was no ctrl-Z */ | ||
892 | return; | ||
893 | G.ctrl_z_flag = 1; | ||
894 | if (!pid) { /* child */ | ||
895 | if (ENABLE_HUSH_JOB) | ||
896 | die_sleep = 0; /* let nofork's xfuncs die */ | ||
897 | bb_setpgrp(); | ||
898 | debug_printf_jobs("set pgrp for child %d ok\n", getpid()); | ||
899 | set_every_sighandler(SIG_DFL); | ||
900 | raise(SIGTSTP); /* resend TSTP so that child will be stopped */ | ||
901 | debug_printf_jobs("returning in child\n"); | ||
902 | /* return to nofork, it will eventually exit now, | ||
903 | * not return back to shell */ | ||
904 | return; | ||
905 | niro | 532 | } |
906 | niro | 816 | /* parent */ |
907 | /* finish filling up pipe info */ | ||
908 | G.toplevel_list->pgrp = pid; /* child is in its own pgrp */ | ||
909 | G.toplevel_list->cmds[0].pid = pid; | ||
910 | /* parent needs to longjmp out of running nofork. | ||
911 | * we will "return" exitcode 0, with child put in background */ | ||
912 | // as usual we can have all kinds of nasty problems with leaked malloc data here | ||
913 | debug_printf_jobs("siglongjmp in parent\n"); | ||
914 | siglongjmp(G.toplevel_jb, 1); | ||
915 | niro | 532 | } |
916 | |||
917 | niro | 816 | /* Restores tty foreground process group, and exits. |
918 | * May be called as signal handler for fatal signal | ||
919 | * (will faithfully resend signal to itself, producing correct exit state) | ||
920 | * or called directly with -EXITCODE. | ||
921 | * We also call it if xfunc is exiting. */ | ||
922 | static void sigexit(int sig) NORETURN; | ||
923 | static void sigexit(int sig) | ||
924 | niro | 532 | { |
925 | niro | 816 | /* Disable all signals: job control, SIGPIPE, etc. */ |
926 | sigprocmask_allsigs(SIG_BLOCK); | ||
927 | niro | 532 | |
928 | niro | 816 | #if ENABLE_HUSH_INTERACTIVE |
929 | if (G.interactive_fd) | ||
930 | tcsetpgrp(G.interactive_fd, G.saved_tty_pgrp); | ||
931 | #endif | ||
932 | niro | 532 | |
933 | niro | 816 | /* Not a signal, just exit */ |
934 | if (sig <= 0) | ||
935 | _exit(- sig); | ||
936 | |||
937 | kill_myself_with_sig(sig); /* does not return */ | ||
938 | niro | 532 | } |
939 | |||
940 | niro | 816 | /* Restores tty foreground process group, and exits. */ |
941 | static void hush_exit(int exitcode) NORETURN; | ||
942 | static void hush_exit(int exitcode) | ||
943 | niro | 532 | { |
944 | niro | 816 | fflush(NULL); /* flush all streams */ |
945 | sigexit(- (exitcode & 0xff)); | ||
946 | niro | 532 | } |
947 | |||
948 | niro | 816 | #else /* !JOB */ |
949 | |||
950 | #define set_fatal_sighandler(handler) ((void)0) | ||
951 | #define set_jobctrl_sighandler(handler) ((void)0) | ||
952 | #define hush_exit(e) exit(e) | ||
953 | |||
954 | #endif /* JOB */ | ||
955 | |||
956 | |||
957 | static const char *set_cwd(void) | ||
958 | niro | 532 | { |
959 | niro | 816 | if (G.cwd == bb_msg_unknown) |
960 | G.cwd = NULL; /* xrealloc_getcwd_or_warn(arg) calls free(arg)! */ | ||
961 | G.cwd = xrealloc_getcwd_or_warn((char *)G.cwd); | ||
962 | if (!G.cwd) | ||
963 | G.cwd = bb_msg_unknown; | ||
964 | return G.cwd; | ||
965 | } | ||
966 | niro | 532 | |
967 | |||
968 | niro | 816 | /* |
969 | * o_string support | ||
970 | */ | ||
971 | #define B_CHUNK (32 * sizeof(char*)) | ||
972 | niro | 532 | |
973 | niro | 816 | static void o_reset(o_string *o) |
974 | { | ||
975 | o->length = 0; | ||
976 | o->nonnull = 0; | ||
977 | if (o->data) | ||
978 | o->data[0] = '\0'; | ||
979 | niro | 532 | } |
980 | |||
981 | niro | 816 | static void o_free(o_string *o) |
982 | niro | 532 | { |
983 | niro | 816 | free(o->data); |
984 | memset(o, 0, sizeof(*o)); | ||
985 | } | ||
986 | |||
987 | static void o_grow_by(o_string *o, int len) | ||
988 | { | ||
989 | if (o->length + len > o->maxlen) { | ||
990 | o->maxlen += (2*len > B_CHUNK ? 2*len : B_CHUNK); | ||
991 | o->data = xrealloc(o->data, 1 + o->maxlen); | ||
992 | niro | 532 | } |
993 | } | ||
994 | |||
995 | niro | 816 | static void o_addchr(o_string *o, int ch) |
996 | niro | 532 | { |
997 | niro | 816 | debug_printf("o_addchr: '%c' o->length=%d o=%p\n", ch, o->length, o); |
998 | o_grow_by(o, 1); | ||
999 | o->data[o->length] = ch; | ||
1000 | o->length++; | ||
1001 | o->data[o->length] = '\0'; | ||
1002 | niro | 532 | } |
1003 | |||
1004 | niro | 816 | static void o_addstr(o_string *o, const char *str, int len) |
1005 | niro | 532 | { |
1006 | niro | 816 | o_grow_by(o, len); |
1007 | memcpy(&o->data[o->length], str, len); | ||
1008 | o->length += len; | ||
1009 | o->data[o->length] = '\0'; | ||
1010 | niro | 532 | } |
1011 | |||
1012 | niro | 816 | static void o_addstr_duplicate_backslash(o_string *o, const char *str, int len) |
1013 | niro | 532 | { |
1014 | niro | 816 | while (len) { |
1015 | o_addchr(o, *str); | ||
1016 | if (*str++ == '\\' | ||
1017 | && (*str != '*' && *str != '?' && *str != '[') | ||
1018 | ) { | ||
1019 | o_addchr(o, '\\'); | ||
1020 | niro | 532 | } |
1021 | niro | 816 | len--; |
1022 | niro | 532 | } |
1023 | } | ||
1024 | |||
1025 | niro | 816 | /* My analysis of quoting semantics tells me that state information |
1026 | * is associated with a destination, not a source. | ||
1027 | */ | ||
1028 | static void o_addqchr(o_string *o, int ch) | ||
1029 | niro | 532 | { |
1030 | niro | 816 | int sz = 1; |
1031 | char *found = strchr("*?[\\", ch); | ||
1032 | if (found) | ||
1033 | sz++; | ||
1034 | o_grow_by(o, sz); | ||
1035 | if (found) { | ||
1036 | o->data[o->length] = '\\'; | ||
1037 | o->length++; | ||
1038 | } | ||
1039 | niro | 532 | o->data[o->length] = ch; |
1040 | o->length++; | ||
1041 | o->data[o->length] = '\0'; | ||
1042 | } | ||
1043 | |||
1044 | niro | 816 | static void o_addQchr(o_string *o, int ch) |
1045 | niro | 532 | { |
1046 | niro | 816 | int sz = 1; |
1047 | if (o->o_quote && strchr("*?[\\", ch)) { | ||
1048 | sz++; | ||
1049 | o->data[o->length] = '\\'; | ||
1050 | o->length++; | ||
1051 | } | ||
1052 | o_grow_by(o, sz); | ||
1053 | o->data[o->length] = ch; | ||
1054 | o->length++; | ||
1055 | o->data[o->length] = '\0'; | ||
1056 | niro | 532 | } |
1057 | |||
1058 | niro | 816 | static void o_addQstr(o_string *o, const char *str, int len) |
1059 | niro | 532 | { |
1060 | niro | 816 | if (!o->o_quote) { |
1061 | o_addstr(o, str, len); | ||
1062 | return; | ||
1063 | } | ||
1064 | while (len) { | ||
1065 | char ch; | ||
1066 | int sz; | ||
1067 | int ordinary_cnt = strcspn(str, "*?[\\"); | ||
1068 | if (ordinary_cnt > len) /* paranoia */ | ||
1069 | ordinary_cnt = len; | ||
1070 | o_addstr(o, str, ordinary_cnt); | ||
1071 | if (ordinary_cnt == len) | ||
1072 | return; | ||
1073 | str += ordinary_cnt; | ||
1074 | len -= ordinary_cnt + 1; /* we are processing + 1 char below */ | ||
1075 | |||
1076 | ch = *str++; | ||
1077 | sz = 1; | ||
1078 | if (ch) { /* it is necessarily one of "*?[\\" */ | ||
1079 | sz++; | ||
1080 | o->data[o->length] = '\\'; | ||
1081 | o->length++; | ||
1082 | } | ||
1083 | o_grow_by(o, sz); | ||
1084 | o->data[o->length] = ch; | ||
1085 | o->length++; | ||
1086 | o->data[o->length] = '\0'; | ||
1087 | } | ||
1088 | niro | 532 | } |
1089 | |||
1090 | niro | 816 | /* A special kind of o_string for $VAR and `cmd` expansion. |
1091 | * It contains char* list[] at the beginning, which is grown in 16 element | ||
1092 | * increments. Actual string data starts at the next multiple of 16 * (char*). | ||
1093 | * list[i] contains an INDEX (int!) into this string data. | ||
1094 | * It means that if list[] needs to grow, data needs to be moved higher up | ||
1095 | * but list[i]'s need not be modified. | ||
1096 | * NB: remembering how many list[i]'s you have there is crucial. | ||
1097 | * o_finalize_list() operation post-processes this structure - calculates | ||
1098 | * and stores actual char* ptrs in list[]. Oh, it NULL terminates it as well. | ||
1099 | niro | 532 | */ |
1100 | niro | 816 | #if DEBUG_EXPAND || DEBUG_GLOB |
1101 | static void debug_print_list(const char *prefix, o_string *o, int n) | ||
1102 | niro | 532 | { |
1103 | niro | 816 | char **list = (char**)o->data; |
1104 | int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]); | ||
1105 | int i = 0; | ||
1106 | fprintf(stderr, "%s: list:%p n:%d string_start:%d length:%d maxlen:%d\n", | ||
1107 | prefix, list, n, string_start, o->length, o->maxlen); | ||
1108 | while (i < n) { | ||
1109 | fprintf(stderr, " list[%d]=%d '%s' %p\n", i, (int)list[i], | ||
1110 | o->data + (int)list[i] + string_start, | ||
1111 | o->data + (int)list[i] + string_start); | ||
1112 | i++; | ||
1113 | niro | 532 | } |
1114 | niro | 816 | if (n) { |
1115 | const char *p = o->data + (int)list[n - 1] + string_start; | ||
1116 | fprintf(stderr, " total_sz:%d\n", (p + strlen(p) + 1) - o->data); | ||
1117 | } | ||
1118 | niro | 532 | } |
1119 | niro | 816 | #else |
1120 | #define debug_print_list(prefix, o, n) ((void)0) | ||
1121 | #endif | ||
1122 | niro | 532 | |
1123 | niro | 816 | /* n = o_save_ptr_helper(str, n) "starts new string" by storing an index value |
1124 | * in list[n] so that it points past last stored byte so far. | ||
1125 | * It returns n+1. */ | ||
1126 | static int o_save_ptr_helper(o_string *o, int n) | ||
1127 | niro | 532 | { |
1128 | niro | 816 | char **list = (char**)o->data; |
1129 | int string_start; | ||
1130 | int string_len; | ||
1131 | |||
1132 | if (!o->has_empty_slot) { | ||
1133 | string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]); | ||
1134 | string_len = o->length - string_start; | ||
1135 | if (!(n & 0xf)) { /* 0, 0x10, 0x20...? */ | ||
1136 | debug_printf_list("list[%d]=%d string_start=%d (growing)\n", n, string_len, string_start); | ||
1137 | /* list[n] points to string_start, make space for 16 more pointers */ | ||
1138 | o->maxlen += 0x10 * sizeof(list[0]); | ||
1139 | o->data = xrealloc(o->data, o->maxlen + 1); | ||
1140 | list = (char**)o->data; | ||
1141 | memmove(list + n + 0x10, list + n, string_len); | ||
1142 | o->length += 0x10 * sizeof(list[0]); | ||
1143 | } else | ||
1144 | debug_printf_list("list[%d]=%d string_start=%d\n", n, string_len, string_start); | ||
1145 | } else { | ||
1146 | /* We have empty slot at list[n], reuse without growth */ | ||
1147 | string_start = ((n+1 + 0xf) & ~0xf) * sizeof(list[0]); /* NB: n+1! */ | ||
1148 | string_len = o->length - string_start; | ||
1149 | debug_printf_list("list[%d]=%d string_start=%d (empty slot)\n", n, string_len, string_start); | ||
1150 | o->has_empty_slot = 0; | ||
1151 | } | ||
1152 | list[n] = (char*)(ptrdiff_t)string_len; | ||
1153 | return n + 1; | ||
1154 | niro | 532 | } |
1155 | |||
1156 | niro | 816 | /* "What was our last o_save_ptr'ed position (byte offset relative o->data)?" */ |
1157 | static int o_get_last_ptr(o_string *o, int n) | ||
1158 | niro | 532 | { |
1159 | niro | 816 | char **list = (char**)o->data; |
1160 | int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]); | ||
1161 | |||
1162 | return ((int)(ptrdiff_t)list[n-1]) + string_start; | ||
1163 | niro | 532 | } |
1164 | |||
1165 | niro | 816 | /* o_glob performs globbing on last list[], saving each result |
1166 | * as a new list[]. */ | ||
1167 | static int o_glob(o_string *o, int n) | ||
1168 | { | ||
1169 | glob_t globdata; | ||
1170 | int gr; | ||
1171 | char *pattern; | ||
1172 | |||
1173 | debug_printf_glob("start o_glob: n:%d o->data:%p\n", n, o->data); | ||
1174 | if (!o->data) | ||
1175 | return o_save_ptr_helper(o, n); | ||
1176 | pattern = o->data + o_get_last_ptr(o, n); | ||
1177 | debug_printf_glob("glob pattern '%s'\n", pattern); | ||
1178 | if (!glob_needed(pattern)) { | ||
1179 | literal: | ||
1180 | o->length = unbackslash(pattern) - o->data; | ||
1181 | debug_printf_glob("glob pattern '%s' is literal\n", pattern); | ||
1182 | return o_save_ptr_helper(o, n); | ||
1183 | } | ||
1184 | |||
1185 | memset(&globdata, 0, sizeof(globdata)); | ||
1186 | gr = glob(pattern, 0, NULL, &globdata); | ||
1187 | debug_printf_glob("glob('%s'):%d\n", pattern, gr); | ||
1188 | if (gr == GLOB_NOSPACE) | ||
1189 | bb_error_msg_and_die("out of memory during glob"); | ||
1190 | if (gr == GLOB_NOMATCH) { | ||
1191 | globfree(&globdata); | ||
1192 | goto literal; | ||
1193 | } | ||
1194 | if (gr != 0) { /* GLOB_ABORTED ? */ | ||
1195 | //TODO: testcase for bad glob pattern behavior | ||
1196 | bb_error_msg("glob(3) error %d on '%s'", gr, pattern); | ||
1197 | } | ||
1198 | if (globdata.gl_pathv && globdata.gl_pathv[0]) { | ||
1199 | char **argv = globdata.gl_pathv; | ||
1200 | o->length = pattern - o->data; /* "forget" pattern */ | ||
1201 | while (1) { | ||
1202 | o_addstr(o, *argv, strlen(*argv) + 1); | ||
1203 | n = o_save_ptr_helper(o, n); | ||
1204 | argv++; | ||
1205 | if (!*argv) | ||
1206 | break; | ||
1207 | } | ||
1208 | } | ||
1209 | globfree(&globdata); | ||
1210 | if (DEBUG_GLOB) | ||
1211 | debug_print_list("o_glob returning", o, n); | ||
1212 | return n; | ||
1213 | } | ||
1214 | |||
1215 | /* If o->o_glob == 1, glob the string so far remembered. | ||
1216 | * Otherwise, just finish current list[] and start new */ | ||
1217 | static int o_save_ptr(o_string *o, int n) | ||
1218 | { | ||
1219 | if (o->o_glob) { /* if globbing is requested */ | ||
1220 | /* If o->has_empty_slot, list[n] was already globbed | ||
1221 | * (if it was requested back then when it was filled) | ||
1222 | * so don't do that again! */ | ||
1223 | if (!o->has_empty_slot) | ||
1224 | return o_glob(o, n); /* o_save_ptr_helper is inside */ | ||
1225 | } | ||
1226 | return o_save_ptr_helper(o, n); | ||
1227 | } | ||
1228 | |||
1229 | /* "Please convert list[n] to real char* ptrs, and NULL terminate it." */ | ||
1230 | static char **o_finalize_list(o_string *o, int n) | ||
1231 | { | ||
1232 | char **list; | ||
1233 | int string_start; | ||
1234 | |||
1235 | n = o_save_ptr(o, n); /* force growth for list[n] if necessary */ | ||
1236 | if (DEBUG_EXPAND) | ||
1237 | debug_print_list("finalized", o, n); | ||
1238 | debug_printf_expand("finalized n:%d\n", n); | ||
1239 | list = (char**)o->data; | ||
1240 | string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]); | ||
1241 | list[--n] = NULL; | ||
1242 | while (n) { | ||
1243 | n--; | ||
1244 | list[n] = o->data + (int)(ptrdiff_t)list[n] + string_start; | ||
1245 | } | ||
1246 | return list; | ||
1247 | } | ||
1248 | |||
1249 | |||
1250 | /* | ||
1251 | * in_str support | ||
1252 | */ | ||
1253 | niro | 532 | static int static_get(struct in_str *i) |
1254 | { | ||
1255 | niro | 816 | int ch = *i->p++; |
1256 | if (ch == '\0') return EOF; | ||
1257 | niro | 532 | return ch; |
1258 | } | ||
1259 | |||
1260 | static int static_peek(struct in_str *i) | ||
1261 | { | ||
1262 | return *i->p; | ||
1263 | } | ||
1264 | |||
1265 | niro | 816 | #if ENABLE_HUSH_INTERACTIVE |
1266 | |||
1267 | #if ENABLE_FEATURE_EDITING | ||
1268 | niro | 532 | static void cmdedit_set_initial_prompt(void) |
1269 | { | ||
1270 | niro | 816 | #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT |
1271 | G.PS1 = NULL; | ||
1272 | niro | 532 | #else |
1273 | niro | 816 | G.PS1 = getenv("PS1"); |
1274 | if (G.PS1 == NULL) | ||
1275 | G.PS1 = "\\w \\$ "; | ||
1276 | niro | 532 | #endif |
1277 | } | ||
1278 | niro | 816 | #endif /* EDITING */ |
1279 | niro | 532 | |
1280 | niro | 816 | static const char* setup_prompt_string(int promptmode) |
1281 | niro | 532 | { |
1282 | niro | 816 | const char *prompt_str; |
1283 | debug_printf("setup_prompt_string %d ", promptmode); | ||
1284 | #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT | ||
1285 | niro | 532 | /* Set up the prompt */ |
1286 | niro | 816 | if (promptmode == 0) { /* PS1 */ |
1287 | free((char*)G.PS1); | ||
1288 | G.PS1 = xasprintf("%s %c ", G.cwd, (geteuid() != 0) ? '$' : '#'); | ||
1289 | prompt_str = G.PS1; | ||
1290 | niro | 532 | } else { |
1291 | niro | 816 | prompt_str = G.PS2; |
1292 | niro | 532 | } |
1293 | #else | ||
1294 | niro | 816 | prompt_str = (promptmode == 0) ? G.PS1 : G.PS2; |
1295 | niro | 532 | #endif |
1296 | niro | 816 | debug_printf("result '%s'\n", prompt_str); |
1297 | return prompt_str; | ||
1298 | niro | 532 | } |
1299 | |||
1300 | static void get_user_input(struct in_str *i) | ||
1301 | { | ||
1302 | niro | 816 | int r; |
1303 | const char *prompt_str; | ||
1304 | niro | 532 | |
1305 | niro | 816 | prompt_str = setup_prompt_string(i->promptmode); |
1306 | #if ENABLE_FEATURE_EDITING | ||
1307 | /* Enable command line editing only while a command line | ||
1308 | * is actually being read */ | ||
1309 | do { | ||
1310 | r = read_line_input(prompt_str, G.user_input_buf, BUFSIZ-1, G.line_input_state); | ||
1311 | } while (r == 0); /* repeat if Ctrl-C */ | ||
1312 | i->eof_flag = (r < 0); | ||
1313 | if (i->eof_flag) { /* EOF/error detected */ | ||
1314 | G.user_input_buf[0] = EOF; /* yes, it will be truncated, it's ok */ | ||
1315 | G.user_input_buf[1] = '\0'; | ||
1316 | } | ||
1317 | niro | 532 | #else |
1318 | fputs(prompt_str, stdout); | ||
1319 | fflush(stdout); | ||
1320 | niro | 816 | G.user_input_buf[0] = r = fgetc(i->file); |
1321 | /*G.user_input_buf[1] = '\0'; - already is and never changed */ | ||
1322 | i->eof_flag = (r == EOF); | ||
1323 | niro | 532 | #endif |
1324 | niro | 816 | i->p = G.user_input_buf; |
1325 | niro | 532 | } |
1326 | |||
1327 | niro | 816 | #endif /* INTERACTIVE */ |
1328 | |||
1329 | niro | 532 | /* This is the magic location that prints prompts |
1330 | * and gets data back from the user */ | ||
1331 | static int file_get(struct in_str *i) | ||
1332 | { | ||
1333 | int ch; | ||
1334 | |||
1335 | /* If there is data waiting, eat it up */ | ||
1336 | if (i->p && *i->p) { | ||
1337 | niro | 816 | #if ENABLE_HUSH_INTERACTIVE |
1338 | take_cached: | ||
1339 | #endif | ||
1340 | ch = *i->p++; | ||
1341 | if (i->eof_flag && !*i->p) | ||
1342 | ch = EOF; | ||
1343 | niro | 532 | } else { |
1344 | /* need to double check i->file because we might be doing something | ||
1345 | * more complicated by now, like sourcing or substituting. */ | ||
1346 | niro | 816 | #if ENABLE_HUSH_INTERACTIVE |
1347 | if (G.interactive_fd && i->promptme && i->file == stdin) { | ||
1348 | do { | ||
1349 | niro | 532 | get_user_input(i); |
1350 | niro | 816 | } while (!*i->p); /* need non-empty line */ |
1351 | i->promptmode = 1; /* PS2 */ | ||
1352 | i->promptme = 0; | ||
1353 | goto take_cached; | ||
1354 | niro | 532 | } |
1355 | niro | 816 | #endif |
1356 | ch = fgetc(i->file); | ||
1357 | niro | 532 | } |
1358 | niro | 816 | debug_printf("file_get: got a '%c' %d\n", ch, ch); |
1359 | #if ENABLE_HUSH_INTERACTIVE | ||
1360 | if (ch == '\n') | ||
1361 | i->promptme = 1; | ||
1362 | #endif | ||
1363 | niro | 532 | return ch; |
1364 | } | ||
1365 | |||
1366 | /* All the callers guarantee this routine will never be | ||
1367 | * used right after a newline, so prompting is not needed. | ||
1368 | */ | ||
1369 | static int file_peek(struct in_str *i) | ||
1370 | { | ||
1371 | niro | 816 | int ch; |
1372 | niro | 532 | if (i->p && *i->p) { |
1373 | niro | 816 | if (i->eof_flag && !i->p[1]) |
1374 | return EOF; | ||
1375 | niro | 532 | return *i->p; |
1376 | } | ||
1377 | niro | 816 | ch = fgetc(i->file); |
1378 | i->eof_flag = (ch == EOF); | ||
1379 | i->peek_buf[0] = ch; | ||
1380 | i->peek_buf[1] = '\0'; | ||
1381 | i->p = i->peek_buf; | ||
1382 | debug_printf("file_peek: got a '%c' %d\n", *i->p, *i->p); | ||
1383 | return ch; | ||
1384 | niro | 532 | } |
1385 | |||
1386 | static void setup_file_in_str(struct in_str *i, FILE *f) | ||
1387 | { | ||
1388 | i->peek = file_peek; | ||
1389 | i->get = file_get; | ||
1390 | niro | 816 | #if ENABLE_HUSH_INTERACTIVE |
1391 | i->promptme = 1; | ||
1392 | i->promptmode = 0; /* PS1 */ | ||
1393 | #endif | ||
1394 | niro | 532 | i->file = f; |
1395 | i->p = NULL; | ||
1396 | } | ||
1397 | |||
1398 | static void setup_string_in_str(struct in_str *i, const char *s) | ||
1399 | { | ||
1400 | i->peek = static_peek; | ||
1401 | i->get = static_get; | ||
1402 | niro | 816 | #if ENABLE_HUSH_INTERACTIVE |
1403 | i->promptme = 1; | ||
1404 | i->promptmode = 0; /* PS1 */ | ||
1405 | #endif | ||
1406 | niro | 532 | i->p = s; |
1407 | niro | 816 | i->eof_flag = 0; |
1408 | niro | 532 | } |
1409 | |||
1410 | |||
1411 | /* squirrel != NULL means we squirrel away copies of stdin, stdout, | ||
1412 | * and stderr if they are redirected. */ | ||
1413 | niro | 816 | static int setup_redirects(struct command *prog, int squirrel[]) |
1414 | niro | 532 | { |
1415 | int openfd, mode; | ||
1416 | struct redir_struct *redir; | ||
1417 | |||
1418 | niro | 816 | for (redir = prog->redirects; redir; redir = redir->next) { |
1419 | if (redir->dup == -1 && redir->rd_filename == NULL) { | ||
1420 | niro | 532 | /* something went wrong in the parse. Pretend it didn't happen */ |
1421 | continue; | ||
1422 | } | ||
1423 | if (redir->dup == -1) { | ||
1424 | niro | 816 | char *p; |
1425 | mode = redir_table[redir->rd_type].mode; | ||
1426 | //TODO: check redir for names like '\\' | ||
1427 | p = expand_string_to_string(redir->rd_filename); | ||
1428 | openfd = open_or_warn(p, mode); | ||
1429 | free(p); | ||
1430 | niro | 532 | if (openfd < 0) { |
1431 | /* this could get lost if stderr has been redirected, but | ||
1432 | bash and ash both lose it as well (though zsh doesn't!) */ | ||
1433 | return 1; | ||
1434 | } | ||
1435 | } else { | ||
1436 | openfd = redir->dup; | ||
1437 | } | ||
1438 | |||
1439 | if (openfd != redir->fd) { | ||
1440 | if (squirrel && redir->fd < 3) { | ||
1441 | squirrel[redir->fd] = dup(redir->fd); | ||
1442 | } | ||
1443 | if (openfd == -3) { | ||
1444 | niro | 816 | //close(openfd); // close(-3) ??! |
1445 | niro | 532 | } else { |
1446 | dup2(openfd, redir->fd); | ||
1447 | if (redir->dup == -1) | ||
1448 | niro | 816 | close(openfd); |
1449 | niro | 532 | } |
1450 | } | ||
1451 | } | ||
1452 | return 0; | ||
1453 | } | ||
1454 | |||
1455 | static void restore_redirects(int squirrel[]) | ||
1456 | { | ||
1457 | int i, fd; | ||
1458 | niro | 816 | for (i = 0; i < 3; i++) { |
1459 | niro | 532 | fd = squirrel[i]; |
1460 | if (fd != -1) { | ||
1461 | niro | 816 | /* We simply die on error */ |
1462 | xmove_fd(fd, i); | ||
1463 | niro | 532 | } |
1464 | } | ||
1465 | } | ||
1466 | |||
1467 | niro | 816 | static char **expand_assignments(char **argv, int count) |
1468 | { | ||
1469 | int i; | ||
1470 | char **p = NULL; | ||
1471 | /* Expand assignments into one string each */ | ||
1472 | for (i = 0; i < count; i++) { | ||
1473 | p = add_string_to_strings(p, expand_string_to_string(argv[i])); | ||
1474 | } | ||
1475 | return p; | ||
1476 | } | ||
1477 | |||
1478 | /* Called after [v]fork() in run_pipe(), or from builtin_exec(). | ||
1479 | * Never returns. | ||
1480 | * XXX no exit() here. If you don't exec, use _exit instead. | ||
1481 | niro | 532 | * The at_exit handlers apparently confuse the calling process, |
1482 | niro | 816 | * in particular stdin handling. Not sure why? -- because of vfork! (vda) */ |
1483 | static void pseudo_exec_argv(nommu_save_t *nommu_save, char **argv, int assignment_cnt, char **argv_expanded) | ||
1484 | niro | 532 | { |
1485 | niro | 816 | int rcode; |
1486 | char **new_env; | ||
1487 | niro | 532 | const struct built_in_command *x; |
1488 | niro | 816 | |
1489 | /* If a variable is assigned in a forest, and nobody listens, | ||
1490 | * was it ever really set? | ||
1491 | */ | ||
1492 | if (!argv[assignment_cnt]) | ||
1493 | _exit(EXIT_SUCCESS); | ||
1494 | |||
1495 | new_env = expand_assignments(argv, assignment_cnt); | ||
1496 | #if BB_MMU | ||
1497 | putenv_all(new_env); | ||
1498 | free(new_env); /* optional */ | ||
1499 | #else | ||
1500 | nommu_save->new_env = new_env; | ||
1501 | nommu_save->old_env = putenv_all_and_save_old(new_env); | ||
1502 | #endif | ||
1503 | if (argv_expanded) { | ||
1504 | argv = argv_expanded; | ||
1505 | } else { | ||
1506 | argv = expand_strvec_to_strvec(argv); | ||
1507 | #if !BB_MMU | ||
1508 | nommu_save->argv = argv; | ||
1509 | #endif | ||
1510 | } | ||
1511 | |||
1512 | /* | ||
1513 | * Check if the command matches any of the builtins. | ||
1514 | * Depending on context, this might be redundant. But it's | ||
1515 | * easier to waste a few CPU cycles than it is to figure out | ||
1516 | * if this is one of those cases. | ||
1517 | */ | ||
1518 | for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) { | ||
1519 | if (strcmp(argv[0], x->cmd) == 0) { | ||
1520 | debug_printf_exec("running builtin '%s'\n", argv[0]); | ||
1521 | rcode = x->function(argv); | ||
1522 | fflush(stdout); | ||
1523 | _exit(rcode); | ||
1524 | niro | 532 | } |
1525 | niro | 816 | } |
1526 | niro | 532 | |
1527 | niro | 816 | /* Check if the command matches any busybox applets */ |
1528 | #if ENABLE_FEATURE_SH_STANDALONE | ||
1529 | if (strchr(argv[0], '/') == NULL) { | ||
1530 | int a = find_applet_by_name(argv[0]); | ||
1531 | if (a >= 0) { | ||
1532 | if (APPLET_IS_NOEXEC(a)) { | ||
1533 | debug_printf_exec("running applet '%s'\n", argv[0]); | ||
1534 | // is it ok that run_applet_no_and_exit() does exit(), not _exit()? | ||
1535 | run_applet_no_and_exit(a, argv); | ||
1536 | niro | 532 | } |
1537 | niro | 816 | /* re-exec ourselves with the new arguments */ |
1538 | debug_printf_exec("re-execing applet '%s'\n", argv[0]); | ||
1539 | execvp(bb_busybox_exec_path, argv); | ||
1540 | /* If they called chroot or otherwise made the binary no longer | ||
1541 | * executable, fall through */ | ||
1542 | niro | 532 | } |
1543 | niro | 816 | } |
1544 | #endif | ||
1545 | niro | 532 | |
1546 | niro | 816 | debug_printf_exec("execing '%s'\n", argv[0]); |
1547 | execvp(argv[0], argv); | ||
1548 | bb_perror_msg("can't exec '%s'", argv[0]); | ||
1549 | _exit(EXIT_FAILURE); | ||
1550 | } | ||
1551 | niro | 532 | |
1552 | niro | 816 | /* Called after [v]fork() in run_pipe() |
1553 | */ | ||
1554 | static void pseudo_exec(nommu_save_t *nommu_save, struct command *command, char **argv_expanded) | ||
1555 | { | ||
1556 | if (command->argv) | ||
1557 | pseudo_exec_argv(nommu_save, command->argv, command->assignment_cnt, argv_expanded); | ||
1558 | |||
1559 | if (command->group) { | ||
1560 | #if !BB_MMU | ||
1561 | bb_error_msg_and_die("nested lists are not supported on NOMMU"); | ||
1562 | #else | ||
1563 | int rcode; | ||
1564 | debug_printf_exec("pseudo_exec: run_list\n"); | ||
1565 | rcode = run_list(command->group); | ||
1566 | niro | 532 | /* OK to leak memory by not calling free_pipe_list, |
1567 | * since this process is about to exit */ | ||
1568 | _exit(rcode); | ||
1569 | niro | 816 | #endif |
1570 | niro | 532 | } |
1571 | niro | 816 | |
1572 | /* Can happen. See what bash does with ">foo" by itself. */ | ||
1573 | debug_printf("trying to pseudo_exec null command\n"); | ||
1574 | _exit(EXIT_SUCCESS); | ||
1575 | niro | 532 | } |
1576 | |||
1577 | niro | 816 | #if ENABLE_HUSH_JOB |
1578 | static const char *get_cmdtext(struct pipe *pi) | ||
1579 | { | ||
1580 | char **argv; | ||
1581 | char *p; | ||
1582 | int len; | ||
1583 | |||
1584 | /* This is subtle. ->cmdtext is created only on first backgrounding. | ||
1585 | * (Think "cat, <ctrl-z>, fg, <ctrl-z>, fg, <ctrl-z>...." here...) | ||
1586 | * On subsequent bg argv is trashed, but we won't use it */ | ||
1587 | if (pi->cmdtext) | ||
1588 | return pi->cmdtext; | ||
1589 | argv = pi->cmds[0].argv; | ||
1590 | if (!argv || !argv[0]) { | ||
1591 | pi->cmdtext = xzalloc(1); | ||
1592 | return pi->cmdtext; | ||
1593 | } | ||
1594 | |||
1595 | len = 0; | ||
1596 | do len += strlen(*argv) + 1; while (*++argv); | ||
1597 | pi->cmdtext = p = xmalloc(len); | ||
1598 | argv = pi->cmds[0].argv; | ||
1599 | do { | ||
1600 | len = strlen(*argv); | ||
1601 | memcpy(p, *argv, len); | ||
1602 | p += len; | ||
1603 | *p++ = ' '; | ||
1604 | } while (*++argv); | ||
1605 | p[-1] = '\0'; | ||
1606 | return pi->cmdtext; | ||
1607 | } | ||
1608 | |||
1609 | niro | 532 | static void insert_bg_job(struct pipe *pi) |
1610 | { | ||
1611 | struct pipe *thejob; | ||
1612 | niro | 816 | int i; |
1613 | niro | 532 | |
1614 | /* Linear search for the ID of the job to use */ | ||
1615 | pi->jobid = 1; | ||
1616 | niro | 816 | for (thejob = G.job_list; thejob; thejob = thejob->next) |
1617 | niro | 532 | if (thejob->jobid >= pi->jobid) |
1618 | pi->jobid = thejob->jobid + 1; | ||
1619 | |||
1620 | niro | 816 | /* Add thejob to the list of running jobs */ |
1621 | if (!G.job_list) { | ||
1622 | thejob = G.job_list = xmalloc(sizeof(*thejob)); | ||
1623 | niro | 532 | } else { |
1624 | niro | 816 | for (thejob = G.job_list; thejob->next; thejob = thejob->next) |
1625 | continue; | ||
1626 | niro | 532 | thejob->next = xmalloc(sizeof(*thejob)); |
1627 | thejob = thejob->next; | ||
1628 | } | ||
1629 | |||
1630 | niro | 816 | /* Physically copy the struct job */ |
1631 | niro | 532 | memcpy(thejob, pi, sizeof(struct pipe)); |
1632 | niro | 816 | thejob->cmds = xzalloc(sizeof(pi->cmds[0]) * pi->num_cmds); |
1633 | /* We cannot copy entire pi->cmds[] vector! Double free()s will happen */ | ||
1634 | for (i = 0; i < pi->num_cmds; i++) { | ||
1635 | // TODO: do we really need to have so many fields which are just dead weight | ||
1636 | // at execution stage? | ||
1637 | thejob->cmds[i].pid = pi->cmds[i].pid; | ||
1638 | /* all other fields are not used and stay zero */ | ||
1639 | } | ||
1640 | niro | 532 | thejob->next = NULL; |
1641 | niro | 816 | thejob->cmdtext = xstrdup(get_cmdtext(pi)); |
1642 | niro | 532 | |
1643 | niro | 816 | /* We don't wait for background thejobs to return -- append it |
1644 | niro | 532 | to the list of backgrounded thejobs and leave it alone */ |
1645 | niro | 816 | printf("[%d] %d %s\n", thejob->jobid, thejob->cmds[0].pid, thejob->cmdtext); |
1646 | G.last_bg_pid = thejob->cmds[0].pid; | ||
1647 | G.last_jobid = thejob->jobid; | ||
1648 | niro | 532 | } |
1649 | |||
1650 | static void remove_bg_job(struct pipe *pi) | ||
1651 | { | ||
1652 | struct pipe *prev_pipe; | ||
1653 | |||
1654 | niro | 816 | if (pi == G.job_list) { |
1655 | G.job_list = pi->next; | ||
1656 | niro | 532 | } else { |
1657 | niro | 816 | prev_pipe = G.job_list; |
1658 | niro | 532 | while (prev_pipe->next != pi) |
1659 | prev_pipe = prev_pipe->next; | ||
1660 | prev_pipe->next = pi->next; | ||
1661 | } | ||
1662 | niro | 816 | if (G.job_list) |
1663 | G.last_jobid = G.job_list->jobid; | ||
1664 | niro | 532 | else |
1665 | niro | 816 | G.last_jobid = 0; |
1666 | } | ||
1667 | niro | 532 | |
1668 | niro | 816 | /* Remove a backgrounded job */ |
1669 | static void delete_finished_bg_job(struct pipe *pi) | ||
1670 | { | ||
1671 | remove_bg_job(pi); | ||
1672 | pi->stopped_cmds = 0; | ||
1673 | niro | 532 | free_pipe(pi, 0); |
1674 | free(pi); | ||
1675 | } | ||
1676 | niro | 816 | #endif /* JOB */ |
1677 | niro | 532 | |
1678 | niro | 816 | /* Check to see if any processes have exited -- if they |
1679 | * have, figure out why and see if a job has completed */ | ||
1680 | niro | 532 | static int checkjobs(struct pipe* fg_pipe) |
1681 | { | ||
1682 | int attributes; | ||
1683 | int status; | ||
1684 | niro | 816 | #if ENABLE_HUSH_JOB |
1685 | niro | 532 | struct pipe *pi; |
1686 | niro | 816 | #endif |
1687 | niro | 532 | pid_t childpid; |
1688 | niro | 816 | int rcode = 0; |
1689 | niro | 532 | |
1690 | attributes = WUNTRACED; | ||
1691 | niro | 816 | if (fg_pipe == NULL) |
1692 | niro | 532 | attributes |= WNOHANG; |
1693 | |||
1694 | niro | 816 | /* Do we do this right? |
1695 | * bash-3.00# sleep 20 | false | ||
1696 | * <ctrl-Z pressed> | ||
1697 | * [3]+ Stopped sleep 20 | false | ||
1698 | * bash-3.00# echo $? | ||
1699 | * 1 <========== bg pipe is not fully done, but exitcode is already known! | ||
1700 | */ | ||
1701 | |||
1702 | //FIXME: non-interactive bash does not continue even if all processes in fg pipe | ||
1703 | //are stopped. Testcase: "cat | cat" in a script (not on command line) | ||
1704 | // + killall -STOP cat | ||
1705 | |||
1706 | wait_more: | ||
1707 | // TODO: safe_waitpid? | ||
1708 | niro | 532 | while ((childpid = waitpid(-1, &status, attributes)) > 0) { |
1709 | niro | 816 | int i; |
1710 | const int dead = WIFEXITED(status) || WIFSIGNALED(status); | ||
1711 | #if DEBUG_JOBS | ||
1712 | if (WIFSTOPPED(status)) | ||
1713 | debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n", | ||
1714 | childpid, WSTOPSIG(status), WEXITSTATUS(status)); | ||
1715 | if (WIFSIGNALED(status)) | ||
1716 | debug_printf_jobs("pid %d killed by sig %d (exitcode %d)\n", | ||
1717 | childpid, WTERMSIG(status), WEXITSTATUS(status)); | ||
1718 | if (WIFEXITED(status)) | ||
1719 | debug_printf_jobs("pid %d exited, exitcode %d\n", | ||
1720 | childpid, WEXITSTATUS(status)); | ||
1721 | #endif | ||
1722 | /* Were we asked to wait for fg pipe? */ | ||
1723 | niro | 532 | if (fg_pipe) { |
1724 | niro | 816 | for (i = 0; i < fg_pipe->num_cmds; i++) { |
1725 | debug_printf_jobs("check pid %d\n", fg_pipe->cmds[i].pid); | ||
1726 | if (fg_pipe->cmds[i].pid != childpid) | ||
1727 | continue; | ||
1728 | /* printf("process %d exit %d\n", i, WEXITSTATUS(status)); */ | ||
1729 | if (dead) { | ||
1730 | fg_pipe->cmds[i].pid = 0; | ||
1731 | fg_pipe->alive_cmds--; | ||
1732 | if (i == fg_pipe->num_cmds - 1) { | ||
1733 | /* last process gives overall exitstatus */ | ||
1734 | rcode = WEXITSTATUS(status); | ||
1735 | IF_HAS_KEYWORDS(if (fg_pipe->pi_inverted) rcode = !rcode;) | ||
1736 | } | ||
1737 | } else { | ||
1738 | fg_pipe->cmds[i].is_stopped = 1; | ||
1739 | fg_pipe->stopped_cmds++; | ||
1740 | } | ||
1741 | debug_printf_jobs("fg_pipe: alive_cmds %d stopped_cmds %d\n", | ||
1742 | fg_pipe->alive_cmds, fg_pipe->stopped_cmds); | ||
1743 | if (fg_pipe->alive_cmds - fg_pipe->stopped_cmds <= 0) { | ||
1744 | /* All processes in fg pipe have exited/stopped */ | ||
1745 | #if ENABLE_HUSH_JOB | ||
1746 | if (fg_pipe->alive_cmds) | ||
1747 | insert_bg_job(fg_pipe); | ||
1748 | #endif | ||
1749 | niro | 532 | return rcode; |
1750 | } | ||
1751 | niro | 816 | /* There are still running processes in the fg pipe */ |
1752 | goto wait_more; /* do waitpid again */ | ||
1753 | niro | 532 | } |
1754 | niro | 816 | /* it wasnt fg_pipe, look for process in bg pipes */ |
1755 | niro | 532 | } |
1756 | |||
1757 | niro | 816 | #if ENABLE_HUSH_JOB |
1758 | /* We asked to wait for bg or orphaned children */ | ||
1759 | /* No need to remember exitcode in this case */ | ||
1760 | for (pi = G.job_list; pi; pi = pi->next) { | ||
1761 | for (i = 0; i < pi->num_cmds; i++) { | ||
1762 | if (pi->cmds[i].pid == childpid) | ||
1763 | goto found_pi_and_prognum; | ||
1764 | niro | 532 | } |
1765 | } | ||
1766 | niro | 816 | /* Happens when shell is used as init process (init=/bin/sh) */ |
1767 | debug_printf("checkjobs: pid %d was not in our list!\n", childpid); | ||
1768 | continue; /* do waitpid again */ | ||
1769 | niro | 532 | |
1770 | niro | 816 | found_pi_and_prognum: |
1771 | if (dead) { | ||
1772 | niro | 532 | /* child exited */ |
1773 | niro | 816 | pi->cmds[i].pid = 0; |
1774 | pi->alive_cmds--; | ||
1775 | if (!pi->alive_cmds) { | ||
1776 | printf(JOB_STATUS_FORMAT, pi->jobid, | ||
1777 | "Done", pi->cmdtext); | ||
1778 | delete_finished_bg_job(pi); | ||
1779 | niro | 532 | } |
1780 | } else { | ||
1781 | /* child stopped */ | ||
1782 | niro | 816 | pi->cmds[i].is_stopped = 1; |
1783 | pi->stopped_cmds++; | ||
1784 | niro | 532 | } |
1785 | niro | 816 | #endif |
1786 | } /* while (waitpid succeeds)... */ | ||
1787 | niro | 532 | |
1788 | niro | 816 | /* wait found no children or failed */ |
1789 | |||
1790 | if (childpid && errno != ECHILD) | ||
1791 | niro | 532 | bb_perror_msg("waitpid"); |
1792 | niro | 816 | return rcode; |
1793 | } | ||
1794 | niro | 532 | |
1795 | niro | 816 | #if ENABLE_HUSH_JOB |
1796 | static int checkjobs_and_fg_shell(struct pipe* fg_pipe) | ||
1797 | { | ||
1798 | pid_t p; | ||
1799 | int rcode = checkjobs(fg_pipe); | ||
1800 | /* Job finished, move the shell to the foreground */ | ||
1801 | p = getpgid(0); /* pgid of our process */ | ||
1802 | debug_printf_jobs("fg'ing ourself: getpgid(0)=%d\n", (int)p); | ||
1803 | tcsetpgrp(G.interactive_fd, p); | ||
1804 | return rcode; | ||
1805 | niro | 532 | } |
1806 | niro | 816 | #endif |
1807 | niro | 532 | |
1808 | niro | 816 | /* run_pipe() starts all the jobs, but doesn't wait for anything |
1809 | niro | 532 | * to finish. See checkjobs(). |
1810 | * | ||
1811 | * return code is normally -1, when the caller has to wait for children | ||
1812 | * to finish to determine the exit status of the pipe. If the pipe | ||
1813 | * is a simple builtin command, however, the action is done by the | ||
1814 | niro | 816 | * time run_pipe returns, and the exit code is provided as the |
1815 | niro | 532 | * return value. |
1816 | * | ||
1817 | * The input of the pipe is always stdin, the output is always | ||
1818 | * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus, | ||
1819 | * because it tries to avoid running the command substitution in | ||
1820 | * subshell, when that is in fact necessary. The subshell process | ||
1821 | * now has its stdout directed to the input of the appropriate pipe, | ||
1822 | * so this routine is noticeably simpler. | ||
1823 | niro | 816 | * |
1824 | * Returns -1 only if started some children. IOW: we have to | ||
1825 | * mask out retvals of builtins etc with 0xff! | ||
1826 | niro | 532 | */ |
1827 | niro | 816 | static int run_pipe(struct pipe *pi) |
1828 | niro | 532 | { |
1829 | int i; | ||
1830 | niro | 816 | int nextin; |
1831 | int pipefds[2]; /* pipefds[0] is for reading */ | ||
1832 | struct command *command; | ||
1833 | char **argv_expanded; | ||
1834 | char **argv; | ||
1835 | niro | 532 | const struct built_in_command *x; |
1836 | char *p; | ||
1837 | niro | 816 | /* it is not always needed, but we aim to smaller code */ |
1838 | int squirrel[] = { -1, -1, -1 }; | ||
1839 | int rcode; | ||
1840 | const int single_and_fg = (pi->num_cmds == 1 && pi->followup != PIPE_BG); | ||
1841 | niro | 532 | |
1842 | niro | 816 | debug_printf_exec("run_pipe start: single_and_fg=%d\n", single_and_fg); |
1843 | |||
1844 | #if ENABLE_HUSH_JOB | ||
1845 | niro | 532 | pi->pgrp = -1; |
1846 | niro | 816 | #endif |
1847 | pi->alive_cmds = 1; | ||
1848 | pi->stopped_cmds = 0; | ||
1849 | niro | 532 | |
1850 | /* Check if this is a simple builtin (not part of a pipe). | ||
1851 | * Builtins within pipes have to fork anyway, and are handled in | ||
1852 | * pseudo_exec. "echo foo | read bar" doesn't work on bash, either. | ||
1853 | */ | ||
1854 | niro | 816 | command = &(pi->cmds[0]); |
1855 | |||
1856 | #if ENABLE_HUSH_FUNCTIONS | ||
1857 | if (single_and_fg && command->group && command->grp_type == GRP_FUNCTION) { | ||
1858 | /* We "execute" function definition */ | ||
1859 | bb_error_msg("here we ought to remember function definition, and go on"); | ||
1860 | return EXIT_SUCCESS; | ||
1861 | } | ||
1862 | #endif | ||
1863 | |||
1864 | if (single_and_fg && command->group && command->grp_type == GRP_NORMAL) { | ||
1865 | niro | 532 | debug_printf("non-subshell grouping\n"); |
1866 | niro | 816 | setup_redirects(command, squirrel); |
1867 | debug_printf_exec(": run_list\n"); | ||
1868 | rcode = run_list(command->group) & 0xff; | ||
1869 | niro | 532 | restore_redirects(squirrel); |
1870 | niro | 816 | debug_printf_exec("run_pipe return %d\n", rcode); |
1871 | IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;) | ||
1872 | niro | 532 | return rcode; |
1873 | niro | 816 | } |
1874 | niro | 532 | |
1875 | niro | 816 | argv = command->argv; |
1876 | argv_expanded = NULL; | ||
1877 | |||
1878 | if (single_and_fg && argv != NULL) { | ||
1879 | char **new_env = NULL; | ||
1880 | char **old_env = NULL; | ||
1881 | |||
1882 | i = command->assignment_cnt; | ||
1883 | if (i != 0 && argv[i] == NULL) { | ||
1884 | /* assignments, but no command: set local environment */ | ||
1885 | for (i = 0; argv[i] != NULL; i++) { | ||
1886 | debug_printf("local environment set: %s\n", argv[i]); | ||
1887 | p = expand_string_to_string(argv[i]); | ||
1888 | set_local_var(p, 0); | ||
1889 | niro | 532 | } |
1890 | niro | 816 | return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */ |
1891 | niro | 532 | } |
1892 | niro | 816 | |
1893 | /* Expand the rest into (possibly) many strings each */ | ||
1894 | argv_expanded = expand_strvec_to_strvec(argv + i); | ||
1895 | |||
1896 | for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) { | ||
1897 | if (strcmp(argv_expanded[0], x->cmd) != 0) | ||
1898 | continue; | ||
1899 | if (x->function == builtin_exec && argv_expanded[1] == NULL) { | ||
1900 | debug_printf("exec with redirects only\n"); | ||
1901 | setup_redirects(command, NULL); | ||
1902 | rcode = EXIT_SUCCESS; | ||
1903 | goto clean_up_and_ret1; | ||
1904 | niro | 532 | } |
1905 | niro | 816 | debug_printf("builtin inline %s\n", argv_expanded[0]); |
1906 | /* XXX setup_redirects acts on file descriptors, not FILEs. | ||
1907 | * This is perfect for work that comes after exec(). | ||
1908 | * Is it really safe for inline use? Experimentally, | ||
1909 | * things seem to work with glibc. */ | ||
1910 | setup_redirects(command, squirrel); | ||
1911 | new_env = expand_assignments(argv, command->assignment_cnt); | ||
1912 | old_env = putenv_all_and_save_old(new_env); | ||
1913 | debug_printf_exec(": builtin '%s' '%s'...\n", x->cmd, argv_expanded[1]); | ||
1914 | rcode = x->function(argv_expanded) & 0xff; | ||
1915 | #if ENABLE_FEATURE_SH_STANDALONE | ||
1916 | clean_up_and_ret: | ||
1917 | #endif | ||
1918 | restore_redirects(squirrel); | ||
1919 | free_strings_and_unsetenv(new_env, 1); | ||
1920 | putenv_all(old_env); | ||
1921 | free(old_env); /* not free_strings()! */ | ||
1922 | clean_up_and_ret1: | ||
1923 | free(argv_expanded); | ||
1924 | IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;) | ||
1925 | debug_printf_exec("run_pipe return %d\n", rcode); | ||
1926 | return rcode; | ||
1927 | niro | 532 | } |
1928 | niro | 816 | #if ENABLE_FEATURE_SH_STANDALONE |
1929 | i = find_applet_by_name(argv_expanded[0]); | ||
1930 | if (i >= 0 && APPLET_IS_NOFORK(i)) { | ||
1931 | setup_redirects(command, squirrel); | ||
1932 | save_nofork_data(&G.nofork_save); | ||
1933 | new_env = expand_assignments(argv, command->assignment_cnt); | ||
1934 | old_env = putenv_all_and_save_old(new_env); | ||
1935 | debug_printf_exec(": run_nofork_applet '%s' '%s'...\n", argv_expanded[0], argv_expanded[1]); | ||
1936 | rcode = run_nofork_applet_prime(&G.nofork_save, i, argv_expanded); | ||
1937 | goto clean_up_and_ret; | ||
1938 | niro | 532 | } |
1939 | niro | 816 | #endif |
1940 | niro | 532 | } |
1941 | |||
1942 | niro | 816 | /* NB: argv_expanded may already be created, and that |
1943 | * might include `cmd` runs! Do not rerun it! We *must* | ||
1944 | * use argv_expanded if it's non-NULL */ | ||
1945 | niro | 532 | |
1946 | niro | 816 | /* Disable job control signals for shell (parent) and |
1947 | * for initial child code after fork */ | ||
1948 | set_jobctrl_sighandler(SIG_IGN); | ||
1949 | niro | 532 | |
1950 | niro | 816 | /* Going to fork a child per each pipe member */ |
1951 | pi->alive_cmds = 0; | ||
1952 | nextin = 0; | ||
1953 | |||
1954 | for (i = 0; i < pi->num_cmds; i++) { | ||
1955 | #if !BB_MMU | ||
1956 | volatile nommu_save_t nommu_save; | ||
1957 | nommu_save.new_env = NULL; | ||
1958 | nommu_save.old_env = NULL; | ||
1959 | nommu_save.argv = NULL; | ||
1960 | niro | 532 | #endif |
1961 | niro | 816 | command = &(pi->cmds[i]); |
1962 | if (command->argv) { | ||
1963 | debug_printf_exec(": pipe member '%s' '%s'...\n", command->argv[0], command->argv[1]); | ||
1964 | } else | ||
1965 | debug_printf_exec(": pipe member with no argv\n"); | ||
1966 | niro | 532 | |
1967 | niro | 816 | /* pipes are inserted between pairs of commands */ |
1968 | pipefds[0] = 0; | ||
1969 | pipefds[1] = 1; | ||
1970 | if ((i + 1) < pi->num_cmds) | ||
1971 | xpipe(pipefds); | ||
1972 | niro | 532 | |
1973 | niro | 816 | command->pid = BB_MMU ? fork() : vfork(); |
1974 | if (!command->pid) { /* child */ | ||
1975 | if (ENABLE_HUSH_JOB) | ||
1976 | die_sleep = 0; /* let nofork's xfuncs die */ | ||
1977 | #if ENABLE_HUSH_JOB | ||
1978 | /* Every child adds itself to new process group | ||
1979 | * with pgid == pid_of_first_child_in_pipe */ | ||
1980 | if (G.run_list_level == 1 && G.interactive_fd) { | ||
1981 | pid_t pgrp; | ||
1982 | /* Don't do pgrp restore anymore on fatal signals */ | ||
1983 | set_fatal_sighandler(SIG_DFL); | ||
1984 | pgrp = pi->pgrp; | ||
1985 | if (pgrp < 0) /* true for 1st process only */ | ||
1986 | pgrp = getpid(); | ||
1987 | if (setpgid(0, pgrp) == 0 && pi->followup != PIPE_BG) { | ||
1988 | /* We do it in *every* child, not just first, | ||
1989 | * to avoid races */ | ||
1990 | tcsetpgrp(G.interactive_fd, pgrp); | ||
1991 | } | ||
1992 | niro | 532 | } |
1993 | niro | 816 | #endif |
1994 | xmove_fd(nextin, 0); | ||
1995 | xmove_fd(pipefds[1], 1); /* write end */ | ||
1996 | if (pipefds[0] > 1) | ||
1997 | close(pipefds[0]); /* read end */ | ||
1998 | niro | 532 | /* Like bash, explicit redirects override pipes, |
1999 | * and the pipe fd is available for dup'ing. */ | ||
2000 | niro | 816 | setup_redirects(command, NULL); |
2001 | niro | 532 | |
2002 | niro | 816 | /* Restore default handlers just prior to exec */ |
2003 | set_jobctrl_sighandler(SIG_DFL); | ||
2004 | set_misc_sighandler(SIG_DFL); | ||
2005 | signal(SIGCHLD, SIG_DFL); | ||
2006 | /* Stores to nommu_save list of env vars putenv'ed | ||
2007 | * (NOMMU, on MMU we don't need that) */ | ||
2008 | /* cast away volatility... */ | ||
2009 | pseudo_exec((nommu_save_t*) &nommu_save, command, argv_expanded); | ||
2010 | /* pseudo_exec() does not return */ | ||
2011 | niro | 532 | } |
2012 | niro | 816 | /* parent */ |
2013 | #if !BB_MMU | ||
2014 | /* Clean up after vforked child */ | ||
2015 | free(nommu_save.argv); | ||
2016 | free_strings_and_unsetenv(nommu_save.new_env, 1); | ||
2017 | putenv_all(nommu_save.old_env); | ||
2018 | #endif | ||
2019 | free(argv_expanded); | ||
2020 | argv_expanded = NULL; | ||
2021 | if (command->pid < 0) { /* [v]fork failed */ | ||
2022 | /* Clearly indicate, was it fork or vfork */ | ||
2023 | bb_perror_msg(BB_MMU ? "fork" : "vfork"); | ||
2024 | } else { | ||
2025 | pi->alive_cmds++; | ||
2026 | #if ENABLE_HUSH_JOB | ||
2027 | /* Second and next children need to know pid of first one */ | ||
2028 | if (pi->pgrp < 0) | ||
2029 | pi->pgrp = command->pid; | ||
2030 | #endif | ||
2031 | niro | 532 | } |
2032 | |||
2033 | niro | 816 | if (i) |
2034 | niro | 532 | close(nextin); |
2035 | niro | 816 | if ((i + 1) < pi->num_cmds) |
2036 | close(pipefds[1]); /* write end */ | ||
2037 | /* Pass read (output) pipe end to next iteration */ | ||
2038 | niro | 532 | nextin = pipefds[0]; |
2039 | } | ||
2040 | niro | 816 | |
2041 | if (!pi->alive_cmds) { | ||
2042 | debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n"); | ||
2043 | return 1; | ||
2044 | } | ||
2045 | |||
2046 | debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->alive_cmds); | ||
2047 | niro | 532 | return -1; |
2048 | } | ||
2049 | |||
2050 | niro | 816 | #ifndef debug_print_tree |
2051 | static void debug_print_tree(struct pipe *pi, int lvl) | ||
2052 | niro | 532 | { |
2053 | niro | 816 | static const char *const PIPE[] = { |
2054 | [PIPE_SEQ] = "SEQ", | ||
2055 | [PIPE_AND] = "AND", | ||
2056 | [PIPE_OR ] = "OR" , | ||
2057 | [PIPE_BG ] = "BG" , | ||
2058 | }; | ||
2059 | static const char *RES[] = { | ||
2060 | [RES_NONE ] = "NONE" , | ||
2061 | #if ENABLE_HUSH_IF | ||
2062 | [RES_IF ] = "IF" , | ||
2063 | [RES_THEN ] = "THEN" , | ||
2064 | [RES_ELIF ] = "ELIF" , | ||
2065 | [RES_ELSE ] = "ELSE" , | ||
2066 | [RES_FI ] = "FI" , | ||
2067 | #endif | ||
2068 | #if ENABLE_HUSH_LOOPS | ||
2069 | [RES_FOR ] = "FOR" , | ||
2070 | [RES_WHILE] = "WHILE", | ||
2071 | [RES_UNTIL] = "UNTIL", | ||
2072 | [RES_DO ] = "DO" , | ||
2073 | [RES_DONE ] = "DONE" , | ||
2074 | #endif | ||
2075 | #if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE | ||
2076 | [RES_IN ] = "IN" , | ||
2077 | #endif | ||
2078 | #if ENABLE_HUSH_CASE | ||
2079 | [RES_CASE ] = "CASE" , | ||
2080 | [RES_MATCH] = "MATCH", | ||
2081 | [RES_CASEI] = "CASEI", | ||
2082 | [RES_ESAC ] = "ESAC" , | ||
2083 | #endif | ||
2084 | [RES_XXXX ] = "XXXX" , | ||
2085 | [RES_SNTX ] = "SNTX" , | ||
2086 | }; | ||
2087 | static const char *const GRPTYPE[] = { | ||
2088 | "()", | ||
2089 | "{}", | ||
2090 | #if ENABLE_HUSH_FUNCTIONS | ||
2091 | "func()", | ||
2092 | #endif | ||
2093 | }; | ||
2094 | |||
2095 | int pin, prn; | ||
2096 | |||
2097 | pin = 0; | ||
2098 | while (pi) { | ||
2099 | fprintf(stderr, "%*spipe %d res_word=%s followup=%d %s\n", lvl*2, "", | ||
2100 | pin, RES[pi->res_word], pi->followup, PIPE[pi->followup]); | ||
2101 | prn = 0; | ||
2102 | while (prn < pi->num_cmds) { | ||
2103 | struct command *command = &pi->cmds[prn]; | ||
2104 | char **argv = command->argv; | ||
2105 | |||
2106 | fprintf(stderr, "%*s prog %d assignment_cnt:%d", lvl*2, "", prn, command->assignment_cnt); | ||
2107 | if (command->group) { | ||
2108 | fprintf(stderr, " group %s: (argv=%p)\n", | ||
2109 | GRPTYPE[command->grp_type], | ||
2110 | argv); | ||
2111 | debug_print_tree(command->group, lvl+1); | ||
2112 | prn++; | ||
2113 | continue; | ||
2114 | } | ||
2115 | if (argv) while (*argv) { | ||
2116 | fprintf(stderr, " '%s'", *argv); | ||
2117 | argv++; | ||
2118 | } | ||
2119 | fprintf(stderr, "\n"); | ||
2120 | prn++; | ||
2121 | niro | 532 | } |
2122 | niro | 816 | pi = pi->next; |
2123 | pin++; | ||
2124 | } | ||
2125 | } | ||
2126 | #endif | ||
2127 | |||
2128 | /* NB: called by pseudo_exec, and therefore must not modify any | ||
2129 | * global data until exec/_exit (we can be a child after vfork!) */ | ||
2130 | static int run_list(struct pipe *pi) | ||
2131 | { | ||
2132 | #if ENABLE_HUSH_CASE | ||
2133 | char *case_word = NULL; | ||
2134 | #endif | ||
2135 | #if ENABLE_HUSH_LOOPS | ||
2136 | struct pipe *loop_top = NULL; | ||
2137 | char *for_varname = NULL; | ||
2138 | char **for_lcur = NULL; | ||
2139 | char **for_list = NULL; | ||
2140 | #endif | ||
2141 | smallint flag_skip = 1; | ||
2142 | smalluint rcode = 0; /* probably just for compiler */ | ||
2143 | #if ENABLE_HUSH_IF || ENABLE_HUSH_CASE | ||
2144 | smalluint cond_code = 0; | ||
2145 | #else | ||
2146 | enum { cond_code = 0, }; | ||
2147 | #endif | ||
2148 | /*enum reserved_style*/ smallint rword = RES_NONE; | ||
2149 | /*enum reserved_style*/ smallint skip_more_for_this_rword = RES_XXXX; | ||
2150 | |||
2151 | debug_printf_exec("run_list start lvl %d\n", G.run_list_level + 1); | ||
2152 | |||
2153 | #if ENABLE_HUSH_LOOPS | ||
2154 | /* Check syntax for "for" */ | ||
2155 | for (struct pipe *cpipe = pi; cpipe; cpipe = cpipe->next) { | ||
2156 | if (cpipe->res_word != RES_FOR && cpipe->res_word != RES_IN) | ||
2157 | continue; | ||
2158 | /* current word is FOR or IN (BOLD in comments below) */ | ||
2159 | if (cpipe->next == NULL) { | ||
2160 | syntax("malformed for"); | ||
2161 | debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level); | ||
2162 | return 1; | ||
2163 | niro | 532 | } |
2164 | niro | 816 | /* "FOR v; do ..." and "for v IN a b; do..." are ok */ |
2165 | if (cpipe->next->res_word == RES_DO) | ||
2166 | continue; | ||
2167 | /* next word is not "do". It must be "in" then ("FOR v in ...") */ | ||
2168 | if (cpipe->res_word == RES_IN /* "for v IN a b; not_do..."? */ | ||
2169 | || cpipe->next->res_word != RES_IN /* FOR v not_do_and_not_in..."? */ | ||
2170 | ) { | ||
2171 | syntax("malformed for"); | ||
2172 | debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level); | ||
2173 | return 1; | ||
2174 | } | ||
2175 | niro | 532 | } |
2176 | niro | 816 | #endif |
2177 | |||
2178 | /* Past this point, all code paths should jump to ret: label | ||
2179 | * in order to return, no direct "return" statements please. | ||
2180 | * This helps to ensure that no memory is leaked. */ | ||
2181 | |||
2182 | #if ENABLE_HUSH_JOB | ||
2183 | /* Example of nested list: "while true; do { sleep 1 | exit 2; } done". | ||
2184 | * We are saving state before entering outermost list ("while...done") | ||
2185 | * so that ctrl-Z will correctly background _entire_ outermost list, | ||
2186 | * not just a part of it (like "sleep 1 | exit 2") */ | ||
2187 | if (++G.run_list_level == 1 && G.interactive_fd) { | ||
2188 | if (sigsetjmp(G.toplevel_jb, 1)) { | ||
2189 | /* ctrl-Z forked and we are parent; or ctrl-C. | ||
2190 | * Sighandler has longjmped us here */ | ||
2191 | signal(SIGINT, SIG_IGN); | ||
2192 | signal(SIGTSTP, SIG_IGN); | ||
2193 | /* Restore level (we can be coming from deep inside | ||
2194 | * nested levels) */ | ||
2195 | G.run_list_level = 1; | ||
2196 | #if ENABLE_FEATURE_SH_STANDALONE | ||
2197 | if (G.nofork_save.saved) { /* if save area is valid */ | ||
2198 | debug_printf_jobs("exiting nofork early\n"); | ||
2199 | restore_nofork_data(&G.nofork_save); | ||
2200 | } | ||
2201 | #endif | ||
2202 | if (G.ctrl_z_flag) { | ||
2203 | /* ctrl-Z has forked and stored pid of the child in pi->pid. | ||
2204 | * Remember this child as background job */ | ||
2205 | insert_bg_job(pi); | ||
2206 | } else { | ||
2207 | /* ctrl-C. We just stop doing whatever we were doing */ | ||
2208 | bb_putchar('\n'); | ||
2209 | } | ||
2210 | USE_HUSH_LOOPS(loop_top = NULL;) | ||
2211 | USE_HUSH_LOOPS(G.depth_of_loop = 0;) | ||
2212 | rcode = 0; | ||
2213 | goto ret; | ||
2214 | niro | 532 | } |
2215 | niro | 816 | /* ctrl-Z handler will store pid etc in pi */ |
2216 | G.toplevel_list = pi; | ||
2217 | G.ctrl_z_flag = 0; | ||
2218 | #if ENABLE_FEATURE_SH_STANDALONE | ||
2219 | G.nofork_save.saved = 0; /* in case we will run a nofork later */ | ||
2220 | #endif | ||
2221 | signal_SA_RESTART_empty_mask(SIGTSTP, handler_ctrl_z); | ||
2222 | signal(SIGINT, handler_ctrl_c); | ||
2223 | } | ||
2224 | #endif /* JOB */ | ||
2225 | |||
2226 | /* Go through list of pipes, (maybe) executing them. */ | ||
2227 | for (; pi; pi = USE_HUSH_LOOPS(rword == RES_DONE ? loop_top : ) pi->next) { | ||
2228 | IF_HAS_KEYWORDS(rword = pi->res_word;) | ||
2229 | IF_HAS_NO_KEYWORDS(rword = RES_NONE;) | ||
2230 | debug_printf_exec(": rword=%d cond_code=%d skip_more=%d\n", | ||
2231 | rword, cond_code, skip_more_for_this_rword); | ||
2232 | #if ENABLE_HUSH_LOOPS | ||
2233 | if ((rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR) | ||
2234 | && loop_top == NULL /* avoid bumping G.depth_of_loop twice */ | ||
2235 | ) { | ||
2236 | /* start of a loop: remember where loop starts */ | ||
2237 | loop_top = pi; | ||
2238 | G.depth_of_loop++; | ||
2239 | } | ||
2240 | #endif | ||
2241 | if (rword == skip_more_for_this_rword && flag_skip) { | ||
2242 | if (pi->followup == PIPE_SEQ) | ||
2243 | flag_skip = 0; | ||
2244 | /* it is "<false> && CMD" or "<true> || CMD" | ||
2245 | * and we should not execute CMD */ | ||
2246 | niro | 532 | continue; |
2247 | } | ||
2248 | flag_skip = 1; | ||
2249 | niro | 816 | skip_more_for_this_rword = RES_XXXX; |
2250 | #if ENABLE_HUSH_IF | ||
2251 | if (cond_code) { | ||
2252 | if (rword == RES_THEN) { | ||
2253 | /* "if <false> THEN cmd": skip cmd */ | ||
2254 | continue; | ||
2255 | } | ||
2256 | } else { | ||
2257 | if (rword == RES_ELSE || rword == RES_ELIF) { | ||
2258 | /* "if <true> then ... ELSE/ELIF cmd": | ||
2259 | * skip cmd and all following ones */ | ||
2260 | break; | ||
2261 | } | ||
2262 | } | ||
2263 | #endif | ||
2264 | #if ENABLE_HUSH_LOOPS | ||
2265 | if (rword == RES_FOR) { /* && pi->num_cmds - always == 1 */ | ||
2266 | if (!for_lcur) { | ||
2267 | /* first loop through for */ | ||
2268 | |||
2269 | static const char encoded_dollar_at[] ALIGN1 = { | ||
2270 | SPECIAL_VAR_SYMBOL, '@' | 0x80, SPECIAL_VAR_SYMBOL, '\0' | ||
2271 | }; /* encoded representation of "$@" */ | ||
2272 | static const char *const encoded_dollar_at_argv[] = { | ||
2273 | encoded_dollar_at, NULL | ||
2274 | }; /* argv list with one element: "$@" */ | ||
2275 | char **vals; | ||
2276 | |||
2277 | vals = (char**)encoded_dollar_at_argv; | ||
2278 | if (pi->next->res_word == RES_IN) { | ||
2279 | /* if no variable values after "in" we skip "for" */ | ||
2280 | if (!pi->next->cmds[0].argv) | ||
2281 | break; | ||
2282 | vals = pi->next->cmds[0].argv; | ||
2283 | } /* else: "for var; do..." -> assume "$@" list */ | ||
2284 | niro | 532 | /* create list of variable values */ |
2285 | niro | 816 | debug_print_strings("for_list made from", vals); |
2286 | for_list = expand_strvec_to_strvec(vals); | ||
2287 | for_lcur = for_list; | ||
2288 | debug_print_strings("for_list", for_list); | ||
2289 | for_varname = pi->cmds[0].argv[0]; | ||
2290 | pi->cmds[0].argv[0] = NULL; | ||
2291 | niro | 532 | } |
2292 | niro | 816 | free(pi->cmds[0].argv[0]); |
2293 | if (!*for_lcur) { | ||
2294 | /* "for" loop is over, clean up */ | ||
2295 | free(for_list); | ||
2296 | for_list = NULL; | ||
2297 | for_lcur = NULL; | ||
2298 | pi->cmds[0].argv[0] = for_varname; | ||
2299 | break; | ||
2300 | niro | 532 | } |
2301 | niro | 816 | /* insert next value from for_lcur */ |
2302 | //TODO: does it need escaping? | ||
2303 | pi->cmds[0].argv[0] = xasprintf("%s=%s", for_varname, *for_lcur++); | ||
2304 | pi->cmds[0].assignment_cnt = 1; | ||
2305 | niro | 532 | } |
2306 | niro | 816 | if (rword == RES_IN) /* "for v IN list;..." - "in" has no cmds anyway */ |
2307 | continue; | ||
2308 | if (rword == RES_DONE) { | ||
2309 | continue; /* "done" has no cmds too */ | ||
2310 | niro | 532 | } |
2311 | niro | 816 | #endif |
2312 | #if ENABLE_HUSH_CASE | ||
2313 | if (rword == RES_CASE) { | ||
2314 | case_word = expand_strvec_to_string(pi->cmds->argv); | ||
2315 | continue; | ||
2316 | } | ||
2317 | if (rword == RES_MATCH) { | ||
2318 | char **argv; | ||
2319 | |||
2320 | if (!case_word) /* "case ... matched_word) ... WORD)": we executed selected branch, stop */ | ||
2321 | break; | ||
2322 | /* all prev words didn't match, does this one match? */ | ||
2323 | argv = pi->cmds->argv; | ||
2324 | while (*argv) { | ||
2325 | char *pattern = expand_string_to_string(*argv); | ||
2326 | /* TODO: which FNM_xxx flags to use? */ | ||
2327 | cond_code = (fnmatch(pattern, case_word, /*flags:*/ 0) != 0); | ||
2328 | free(pattern); | ||
2329 | if (cond_code == 0) { /* match! we will execute this branch */ | ||
2330 | free(case_word); /* make future "word)" stop */ | ||
2331 | case_word = NULL; | ||
2332 | break; | ||
2333 | } | ||
2334 | argv++; | ||
2335 | niro | 532 | } |
2336 | niro | 816 | continue; |
2337 | niro | 532 | } |
2338 | niro | 816 | if (rword == RES_CASEI) { /* inside of a case branch */ |
2339 | if (cond_code != 0) | ||
2340 | continue; /* not matched yet, skip this pipe */ | ||
2341 | } | ||
2342 | #endif | ||
2343 | if (pi->num_cmds == 0) | ||
2344 | continue; | ||
2345 | |||
2346 | /* After analyzing all keywords and conditions, we decided | ||
2347 | * to execute this pipe. NB: has to do checkjobs(NULL) | ||
2348 | * after run_pipe() to collect any background children, | ||
2349 | * even if list execution is to be stopped. */ | ||
2350 | debug_printf_exec(": run_pipe with %d members\n", pi->num_cmds); | ||
2351 | { | ||
2352 | int r; | ||
2353 | #if ENABLE_HUSH_LOOPS | ||
2354 | G.flag_break_continue = 0; | ||
2355 | #endif | ||
2356 | rcode = r = run_pipe(pi); /* NB: rcode is a smallint */ | ||
2357 | if (r != -1) { | ||
2358 | /* we only ran a builtin: rcode is already known | ||
2359 | * and we don't need to wait for anything. */ | ||
2360 | #if ENABLE_HUSH_LOOPS | ||
2361 | /* was it "break" or "continue"? */ | ||
2362 | if (G.flag_break_continue) { | ||
2363 | smallint fbc = G.flag_break_continue; | ||
2364 | /* we might fall into outer *loop*, | ||
2365 | * don't want to break it too */ | ||
2366 | if (loop_top) { | ||
2367 | G.depth_break_continue--; | ||
2368 | if (G.depth_break_continue == 0) | ||
2369 | G.flag_break_continue = 0; | ||
2370 | /* else: e.g. "continue 2" should *break* once, *then* continue */ | ||
2371 | } /* else: "while... do... { we are here (innermost list is not a loop!) };...done" */ | ||
2372 | if (G.depth_break_continue != 0 || fbc == BC_BREAK) | ||
2373 | goto check_jobs_and_break; | ||
2374 | /* "continue": simulate end of loop */ | ||
2375 | rword = RES_DONE; | ||
2376 | continue; | ||
2377 | } | ||
2378 | #endif | ||
2379 | } else if (pi->followup == PIPE_BG) { | ||
2380 | /* what does bash do with attempts to background builtins? */ | ||
2381 | /* even bash 3.2 doesn't do that well with nested bg: | ||
2382 | * try "{ { sleep 10; echo DEEP; } & echo HERE; } &". | ||
2383 | * I'm NOT treating inner &'s as jobs */ | ||
2384 | #if ENABLE_HUSH_JOB | ||
2385 | if (G.run_list_level == 1) | ||
2386 | insert_bg_job(pi); | ||
2387 | #endif | ||
2388 | rcode = 0; /* EXIT_SUCCESS */ | ||
2389 | niro | 532 | } else { |
2390 | niro | 816 | #if ENABLE_HUSH_JOB |
2391 | if (G.run_list_level == 1 && G.interactive_fd) { | ||
2392 | /* waits for completion, then fg's main shell */ | ||
2393 | rcode = checkjobs_and_fg_shell(pi); | ||
2394 | debug_printf_exec(": checkjobs_and_fg_shell returned %d\n", rcode); | ||
2395 | } else | ||
2396 | #endif | ||
2397 | { /* this one just waits for completion */ | ||
2398 | rcode = checkjobs(pi); | ||
2399 | debug_printf_exec(": checkjobs returned %d\n", rcode); | ||
2400 | } | ||
2401 | niro | 532 | } |
2402 | } | ||
2403 | niro | 816 | debug_printf_exec(": setting last_return_code=%d\n", rcode); |
2404 | G.last_return_code = rcode; | ||
2405 | |||
2406 | /* Analyze how result affects subsequent commands */ | ||
2407 | #if ENABLE_HUSH_IF | ||
2408 | if (rword == RES_IF || rword == RES_ELIF) | ||
2409 | cond_code = rcode; | ||
2410 | #endif | ||
2411 | #if ENABLE_HUSH_LOOPS | ||
2412 | if (rword == RES_WHILE) { | ||
2413 | if (rcode) { | ||
2414 | rcode = 0; /* "while false; do...done" - exitcode 0 */ | ||
2415 | goto check_jobs_and_break; | ||
2416 | } | ||
2417 | } | ||
2418 | if (rword == RES_UNTIL) { | ||
2419 | if (!rcode) { | ||
2420 | check_jobs_and_break: | ||
2421 | checkjobs(NULL); | ||
2422 | break; | ||
2423 | } | ||
2424 | } | ||
2425 | #endif | ||
2426 | if ((rcode == 0 && pi->followup == PIPE_OR) | ||
2427 | || (rcode != 0 && pi->followup == PIPE_AND) | ||
2428 | ) { | ||
2429 | skip_more_for_this_rword = rword; | ||
2430 | } | ||
2431 | niro | 532 | checkjobs(NULL); |
2432 | niro | 816 | } /* for (pi) */ |
2433 | |||
2434 | #if ENABLE_HUSH_JOB | ||
2435 | if (G.ctrl_z_flag) { | ||
2436 | /* ctrl-Z forked somewhere in the past, we are the child, | ||
2437 | * and now we completed running the list. Exit. */ | ||
2438 | //TODO: _exit? | ||
2439 | exit(rcode); | ||
2440 | niro | 532 | } |
2441 | niro | 816 | ret: |
2442 | if (!--G.run_list_level && G.interactive_fd) { | ||
2443 | signal(SIGTSTP, SIG_IGN); | ||
2444 | signal(SIGINT, SIG_IGN); | ||
2445 | } | ||
2446 | #endif | ||
2447 | debug_printf_exec("run_list lvl %d return %d\n", G.run_list_level + 1, rcode); | ||
2448 | #if ENABLE_HUSH_LOOPS | ||
2449 | if (loop_top) | ||
2450 | G.depth_of_loop--; | ||
2451 | free(for_list); | ||
2452 | #endif | ||
2453 | #if ENABLE_HUSH_CASE | ||
2454 | free(case_word); | ||
2455 | #endif | ||
2456 | niro | 532 | return rcode; |
2457 | } | ||
2458 | |||
2459 | /* return code is the exit status of the pipe */ | ||
2460 | static int free_pipe(struct pipe *pi, int indent) | ||
2461 | { | ||
2462 | char **p; | ||
2463 | niro | 816 | struct command *command; |
2464 | niro | 532 | struct redir_struct *r, *rnext; |
2465 | niro | 816 | int a, i, ret_code = 0; |
2466 | niro | 532 | |
2467 | niro | 816 | if (pi->stopped_cmds > 0) |
2468 | niro | 532 | return ret_code; |
2469 | niro | 816 | debug_printf_clean("%s run pipe: (pid %d)\n", indenter(indent), getpid()); |
2470 | for (i = 0; i < pi->num_cmds; i++) { | ||
2471 | command = &pi->cmds[i]; | ||
2472 | debug_printf_clean("%s command %d:\n", indenter(indent), i); | ||
2473 | if (command->argv) { | ||
2474 | for (a = 0, p = command->argv; *p; a++, p++) { | ||
2475 | debug_printf_clean("%s argv[%d] = %s\n", indenter(indent), a, *p); | ||
2476 | niro | 532 | } |
2477 | niro | 816 | free_strings(command->argv); |
2478 | command->argv = NULL; | ||
2479 | } else if (command->group) { | ||
2480 | debug_printf_clean("%s begin group (grp_type:%d)\n", indenter(indent), command->grp_type); | ||
2481 | ret_code = free_pipe_list(command->group, indent+3); | ||
2482 | debug_printf_clean("%s end group\n", indenter(indent)); | ||
2483 | niro | 532 | } else { |
2484 | niro | 816 | debug_printf_clean("%s (nil)\n", indenter(indent)); |
2485 | niro | 532 | } |
2486 | niro | 816 | for (r = command->redirects; r; r = rnext) { |
2487 | debug_printf_clean("%s redirect %d%s", indenter(indent), r->fd, redir_table[r->rd_type].descrip); | ||
2488 | niro | 532 | if (r->dup == -1) { |
2489 | /* guard against the case >$FOO, where foo is unset or blank */ | ||
2490 | niro | 816 | if (r->rd_filename) { |
2491 | debug_printf_clean(" %s\n", r->rd_filename); | ||
2492 | free(r->rd_filename); | ||
2493 | r->rd_filename = NULL; | ||
2494 | niro | 532 | } |
2495 | } else { | ||
2496 | niro | 816 | debug_printf_clean("&%d\n", r->dup); |
2497 | niro | 532 | } |
2498 | niro | 816 | rnext = r->next; |
2499 | niro | 532 | free(r); |
2500 | } | ||
2501 | niro | 816 | command->redirects = NULL; |
2502 | niro | 532 | } |
2503 | niro | 816 | free(pi->cmds); /* children are an array, they get freed all at once */ |
2504 | pi->cmds = NULL; | ||
2505 | #if ENABLE_HUSH_JOB | ||
2506 | free(pi->cmdtext); | ||
2507 | pi->cmdtext = NULL; | ||
2508 | #endif | ||
2509 | niro | 532 | return ret_code; |
2510 | } | ||
2511 | |||
2512 | static int free_pipe_list(struct pipe *head, int indent) | ||
2513 | { | ||
2514 | niro | 816 | int rcode = 0; /* if list has no members */ |
2515 | niro | 532 | struct pipe *pi, *next; |
2516 | niro | 816 | |
2517 | for (pi = head; pi; pi = next) { | ||
2518 | #if HAS_KEYWORDS | ||
2519 | debug_printf_clean("%s pipe reserved mode %d\n", indenter(indent), pi->res_word); | ||
2520 | #endif | ||
2521 | niro | 532 | rcode = free_pipe(pi, indent); |
2522 | niro | 816 | debug_printf_clean("%s pipe followup code %d\n", indenter(indent), pi->followup); |
2523 | next = pi->next; | ||
2524 | /*pi->next = NULL;*/ | ||
2525 | niro | 532 | free(pi); |
2526 | } | ||
2527 | return rcode; | ||
2528 | } | ||
2529 | |||
2530 | /* Select which version we will use */ | ||
2531 | niro | 816 | static int run_and_free_list(struct pipe *pi) |
2532 | niro | 532 | { |
2533 | niro | 816 | int rcode = 0; |
2534 | debug_printf_exec("run_and_free_list entered\n"); | ||
2535 | if (!G.fake_mode) { | ||
2536 | debug_printf_exec(": run_list with %d members\n", pi->num_cmds); | ||
2537 | rcode = run_list(pi); | ||
2538 | niro | 532 | } |
2539 | niro | 816 | /* free_pipe_list has the side effect of clearing memory. |
2540 | * In the long run that function can be merged with run_list, | ||
2541 | niro | 532 | * but doing that now would hobble the debugging effort. */ |
2542 | niro | 816 | free_pipe_list(pi, /* indent: */ 0); |
2543 | debug_printf_exec("run_and_free_list return %d\n", rcode); | ||
2544 | niro | 532 | return rcode; |
2545 | } | ||
2546 | |||
2547 | niro | 816 | |
2548 | /* expand_strvec_to_strvec() takes a list of strings, expands | ||
2549 | * all variable references within and returns a pointer to | ||
2550 | * a list of expanded strings, possibly with larger number | ||
2551 | * of strings. (Think VAR="a b"; echo $VAR). | ||
2552 | * This new list is allocated as a single malloc block. | ||
2553 | * NULL-terminated list of char* pointers is at the beginning of it, | ||
2554 | * followed by strings themself. | ||
2555 | * Caller can deallocate entire list by single free(list). */ | ||
2556 | |||
2557 | /* Store given string, finalizing the word and starting new one whenever | ||
2558 | * we encounter IFS char(s). This is used for expanding variable values. | ||
2559 | * End-of-string does NOT finalize word: think about 'echo -$VAR-' */ | ||
2560 | static int expand_on_ifs(o_string *output, int n, const char *str) | ||
2561 | niro | 532 | { |
2562 | niro | 816 | while (1) { |
2563 | int word_len = strcspn(str, G.ifs); | ||
2564 | if (word_len) { | ||
2565 | if (output->o_quote || !output->o_glob) | ||
2566 | o_addQstr(output, str, word_len); | ||
2567 | else /* protect backslashes against globbing up :) */ | ||
2568 | o_addstr_duplicate_backslash(output, str, word_len); | ||
2569 | str += word_len; | ||
2570 | } | ||
2571 | if (!*str) /* EOL - do not finalize word */ | ||
2572 | break; | ||
2573 | o_addchr(output, '\0'); | ||
2574 | debug_print_list("expand_on_ifs", output, n); | ||
2575 | n = o_save_ptr(output, n); | ||
2576 | str += strspn(str, G.ifs); /* skip ifs chars */ | ||
2577 | niro | 532 | } |
2578 | niro | 816 | debug_print_list("expand_on_ifs[1]", output, n); |
2579 | return n; | ||
2580 | } | ||
2581 | |||
2582 | /* Expand all variable references in given string, adding words to list[] | ||
2583 | * at n, n+1,... positions. Return updated n (so that list[n] is next one | ||
2584 | * to be filled). This routine is extremely tricky: has to deal with | ||
2585 | * variables/parameters with whitespace, $* and $@, and constructs like | ||
2586 | * 'echo -$*-'. If you play here, you must run testsuite afterwards! */ | ||
2587 | static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask) | ||
2588 | { | ||
2589 | /* or_mask is either 0 (normal case) or 0x80 | ||
2590 | * (expansion of right-hand side of assignment == 1-element expand. | ||
2591 | * It will also do no globbing, and thus we must not backslash-quote!) */ | ||
2592 | |||
2593 | char first_ch, ored_ch; | ||
2594 | int i; | ||
2595 | const char *val; | ||
2596 | char *p; | ||
2597 | |||
2598 | ored_ch = 0; | ||
2599 | |||
2600 | debug_printf_expand("expand_vars_to_list: arg '%s'\n", arg); | ||
2601 | debug_print_list("expand_vars_to_list", output, n); | ||
2602 | n = o_save_ptr(output, n); | ||
2603 | debug_print_list("expand_vars_to_list[0]", output, n); | ||
2604 | |||
2605 | while ((p = strchr(arg, SPECIAL_VAR_SYMBOL)) != NULL) { | ||
2606 | #if ENABLE_HUSH_TICK | ||
2607 | o_string subst_result = NULL_O_STRING; | ||
2608 | #endif | ||
2609 | o_addstr(output, arg, p - arg); | ||
2610 | debug_print_list("expand_vars_to_list[1]", output, n); | ||
2611 | arg = ++p; | ||
2612 | p = strchr(p, SPECIAL_VAR_SYMBOL); | ||
2613 | |||
2614 | first_ch = arg[0] | or_mask; /* forced to "quoted" if or_mask = 0x80 */ | ||
2615 | /* "$@" is special. Even if quoted, it can still | ||
2616 | * expand to nothing (not even an empty string) */ | ||
2617 | if ((first_ch & 0x7f) != '@') | ||
2618 | ored_ch |= first_ch; | ||
2619 | val = NULL; | ||
2620 | switch (first_ch & 0x7f) { | ||
2621 | /* Highest bit in first_ch indicates that var is double-quoted */ | ||
2622 | case '$': /* pid */ | ||
2623 | val = utoa(G.root_pid); | ||
2624 | break; | ||
2625 | case '!': /* bg pid */ | ||
2626 | val = G.last_bg_pid ? utoa(G.last_bg_pid) : (char*)""; | ||
2627 | break; | ||
2628 | case '?': /* exitcode */ | ||
2629 | val = utoa(G.last_return_code); | ||
2630 | break; | ||
2631 | case '#': /* argc */ | ||
2632 | val = utoa(G.global_argc ? G.global_argc-1 : 0); | ||
2633 | break; | ||
2634 | case '*': | ||
2635 | case '@': | ||
2636 | i = 1; | ||
2637 | if (!G.global_argv[i]) | ||
2638 | break; | ||
2639 | ored_ch |= first_ch; /* do it for "$@" _now_, when we know it's not empty */ | ||
2640 | if (!(first_ch & 0x80)) { /* unquoted $* or $@ */ | ||
2641 | smallint sv = output->o_quote; | ||
2642 | /* unquoted var's contents should be globbed, so don't quote */ | ||
2643 | output->o_quote = 0; | ||
2644 | while (G.global_argv[i]) { | ||
2645 | n = expand_on_ifs(output, n, G.global_argv[i]); | ||
2646 | debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, G.global_argc - 1); | ||
2647 | if (G.global_argv[i++][0] && G.global_argv[i]) { | ||
2648 | /* this argv[] is not empty and not last: | ||
2649 | * put terminating NUL, start new word */ | ||
2650 | o_addchr(output, '\0'); | ||
2651 | debug_print_list("expand_vars_to_list[2]", output, n); | ||
2652 | n = o_save_ptr(output, n); | ||
2653 | debug_print_list("expand_vars_to_list[3]", output, n); | ||
2654 | } | ||
2655 | } | ||
2656 | output->o_quote = sv; | ||
2657 | } else | ||
2658 | /* If or_mask is nonzero, we handle assignment 'a=....$@.....' | ||
2659 | * and in this case should treat it like '$*' - see 'else...' below */ | ||
2660 | if (first_ch == ('@'|0x80) && !or_mask) { /* quoted $@ */ | ||
2661 | while (1) { | ||
2662 | o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i])); | ||
2663 | if (++i >= G.global_argc) | ||
2664 | break; | ||
2665 | o_addchr(output, '\0'); | ||
2666 | debug_print_list("expand_vars_to_list[4]", output, n); | ||
2667 | n = o_save_ptr(output, n); | ||
2668 | } | ||
2669 | } else { /* quoted $*: add as one word */ | ||
2670 | while (1) { | ||
2671 | o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i])); | ||
2672 | if (!G.global_argv[++i]) | ||
2673 | break; | ||
2674 | if (G.ifs[0]) | ||
2675 | o_addchr(output, G.ifs[0]); | ||
2676 | } | ||
2677 | } | ||
2678 | break; | ||
2679 | case SPECIAL_VAR_SYMBOL: /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_SYMBOL> */ | ||
2680 | /* "Empty variable", used to make "" etc to not disappear */ | ||
2681 | arg++; | ||
2682 | ored_ch = 0x80; | ||
2683 | break; | ||
2684 | #if ENABLE_HUSH_TICK | ||
2685 | case '`': { /* <SPECIAL_VAR_SYMBOL>`cmd<SPECIAL_VAR_SYMBOL> */ | ||
2686 | struct in_str input; | ||
2687 | *p = '\0'; | ||
2688 | arg++; | ||
2689 | //TODO: can we just stuff it into "output" directly? | ||
2690 | debug_printf_subst("SUBST '%s' first_ch %x\n", arg, first_ch); | ||
2691 | setup_string_in_str(&input, arg); | ||
2692 | process_command_subs(&subst_result, &input, NULL); | ||
2693 | debug_printf_subst("SUBST RES '%s'\n", subst_result.data); | ||
2694 | val = subst_result.data; | ||
2695 | goto store_val; | ||
2696 | } | ||
2697 | #endif | ||
2698 | default: /* <SPECIAL_VAR_SYMBOL>varname<SPECIAL_VAR_SYMBOL> */ | ||
2699 | *p = '\0'; | ||
2700 | arg[0] = first_ch & 0x7f; | ||
2701 | if (isdigit(arg[0])) { | ||
2702 | i = xatoi_u(arg); | ||
2703 | if (i < G.global_argc) | ||
2704 | val = G.global_argv[i]; | ||
2705 | /* else val remains NULL: $N with too big N */ | ||
2706 | } else | ||
2707 | val = lookup_param(arg); | ||
2708 | arg[0] = first_ch; | ||
2709 | #if ENABLE_HUSH_TICK | ||
2710 | store_val: | ||
2711 | #endif | ||
2712 | *p = SPECIAL_VAR_SYMBOL; | ||
2713 | if (!(first_ch & 0x80)) { /* unquoted $VAR */ | ||
2714 | debug_printf_expand("unquoted '%s', output->o_quote:%d\n", val, output->o_quote); | ||
2715 | if (val) { | ||
2716 | /* unquoted var's contents should be globbed, so don't quote */ | ||
2717 | smallint sv = output->o_quote; | ||
2718 | output->o_quote = 0; | ||
2719 | n = expand_on_ifs(output, n, val); | ||
2720 | val = NULL; | ||
2721 | output->o_quote = sv; | ||
2722 | } | ||
2723 | } else { /* quoted $VAR, val will be appended below */ | ||
2724 | debug_printf_expand("quoted '%s', output->o_quote:%d\n", val, output->o_quote); | ||
2725 | } | ||
2726 | } | ||
2727 | if (val) { | ||
2728 | o_addQstr(output, val, strlen(val)); | ||
2729 | } | ||
2730 | |||
2731 | #if ENABLE_HUSH_TICK | ||
2732 | o_free(&subst_result); | ||
2733 | #endif | ||
2734 | arg = ++p; | ||
2735 | } /* end of "while (SPECIAL_VAR_SYMBOL is found) ..." */ | ||
2736 | |||
2737 | if (arg[0]) { | ||
2738 | debug_print_list("expand_vars_to_list[a]", output, n); | ||
2739 | /* this part is literal, and it was already pre-quoted | ||
2740 | * if needed (much earlier), do not use o_addQstr here! */ | ||
2741 | o_addstr(output, arg, strlen(arg) + 1); | ||
2742 | debug_print_list("expand_vars_to_list[b]", output, n); | ||
2743 | } else if (output->length == o_get_last_ptr(output, n) /* expansion is empty */ | ||
2744 | && !(ored_ch & 0x80) /* and all vars were not quoted. */ | ||
2745 | ) { | ||
2746 | n--; | ||
2747 | /* allow to reuse list[n] later without re-growth */ | ||
2748 | output->has_empty_slot = 1; | ||
2749 | } else { | ||
2750 | o_addchr(output, '\0'); | ||
2751 | niro | 532 | } |
2752 | niro | 816 | return n; |
2753 | niro | 532 | } |
2754 | |||
2755 | niro | 816 | static char **expand_variables(char **argv, int or_mask) |
2756 | niro | 532 | { |
2757 | niro | 816 | int n; |
2758 | char **list; | ||
2759 | char **v; | ||
2760 | o_string output = NULL_O_STRING; | ||
2761 | |||
2762 | if (or_mask & 0x100) { | ||
2763 | output.o_quote = 1; /* protect against globbing for "$var" */ | ||
2764 | /* (unquoted $var will temporarily switch it off) */ | ||
2765 | output.o_glob = 1; | ||
2766 | niro | 532 | } |
2767 | niro | 816 | |
2768 | n = 0; | ||
2769 | v = argv; | ||
2770 | while (*v) { | ||
2771 | n = expand_vars_to_list(&output, n, *v, (char)or_mask); | ||
2772 | v++; | ||
2773 | } | ||
2774 | debug_print_list("expand_variables", &output, n); | ||
2775 | |||
2776 | /* output.data (malloced in one block) gets returned in "list" */ | ||
2777 | list = o_finalize_list(&output, n); | ||
2778 | debug_print_strings("expand_variables[1]", list); | ||
2779 | return list; | ||
2780 | niro | 532 | } |
2781 | |||
2782 | niro | 816 | static char **expand_strvec_to_strvec(char **argv) |
2783 | niro | 532 | { |
2784 | niro | 816 | return expand_variables(argv, 0x100); |
2785 | } | ||
2786 | niro | 532 | |
2787 | niro | 816 | /* Used for expansion of right hand of assignments */ |
2788 | /* NB: should NOT do globbing! "export v=/bin/c*; env | grep ^v=" outputs | ||
2789 | * "v=/bin/c*" */ | ||
2790 | static char *expand_string_to_string(const char *str) | ||
2791 | { | ||
2792 | char *argv[2], **list; | ||
2793 | |||
2794 | argv[0] = (char*)str; | ||
2795 | argv[1] = NULL; | ||
2796 | list = expand_variables(argv, 0x80); /* 0x80: make one-element expansion */ | ||
2797 | if (HUSH_DEBUG) | ||
2798 | if (!list[0] || list[1]) | ||
2799 | bb_error_msg_and_die("BUG in varexp2"); | ||
2800 | /* actually, just move string 2*sizeof(char*) bytes back */ | ||
2801 | strcpy((char*)list, list[0]); | ||
2802 | debug_printf_expand("string_to_string='%s'\n", (char*)list); | ||
2803 | return (char*)list; | ||
2804 | } | ||
2805 | |||
2806 | /* Used for "eval" builtin */ | ||
2807 | static char* expand_strvec_to_string(char **argv) | ||
2808 | { | ||
2809 | char **list; | ||
2810 | |||
2811 | list = expand_variables(argv, 0x80); | ||
2812 | /* Convert all NULs to spaces */ | ||
2813 | if (list[0]) { | ||
2814 | int n = 1; | ||
2815 | while (list[n]) { | ||
2816 | if (HUSH_DEBUG) | ||
2817 | if (list[n-1] + strlen(list[n-1]) + 1 != list[n]) | ||
2818 | bb_error_msg_and_die("BUG in varexp3"); | ||
2819 | list[n][-1] = ' '; /* TODO: or to G.ifs[0]? */ | ||
2820 | n++; | ||
2821 | niro | 532 | } |
2822 | } | ||
2823 | niro | 816 | strcpy((char*)list, list[0]); |
2824 | debug_printf_expand("strvec_to_string='%s'\n", (char*)list); | ||
2825 | return (char*)list; | ||
2826 | niro | 532 | } |
2827 | |||
2828 | niro | 816 | |
2829 | /* Used to get/check local shell variables */ | ||
2830 | static struct variable *get_local_var(const char *name) | ||
2831 | niro | 532 | { |
2832 | niro | 816 | struct variable *cur; |
2833 | int len; | ||
2834 | niro | 532 | |
2835 | niro | 816 | if (!name) |
2836 | niro | 532 | return NULL; |
2837 | niro | 816 | len = strlen(name); |
2838 | for (cur = G.top_var; cur; cur = cur->next) { | ||
2839 | if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=') | ||
2840 | return cur; | ||
2841 | } | ||
2842 | niro | 532 | return NULL; |
2843 | } | ||
2844 | |||
2845 | niro | 816 | /* str holds "NAME=VAL" and is expected to be malloced. |
2846 | * We take ownership of it. */ | ||
2847 | static int set_local_var(char *str, int flg_export) | ||
2848 | niro | 532 | { |
2849 | niro | 816 | struct variable *cur; |
2850 | char *value; | ||
2851 | int name_len; | ||
2852 | niro | 532 | |
2853 | niro | 816 | value = strchr(str, '='); |
2854 | if (!value) { /* not expected to ever happen? */ | ||
2855 | free(str); | ||
2856 | niro | 532 | return -1; |
2857 | } | ||
2858 | |||
2859 | niro | 816 | name_len = value - str + 1; /* including '=' */ |
2860 | cur = G.top_var; /* cannot be NULL (we have HUSH_VERSION and it's RO) */ | ||
2861 | while (1) { | ||
2862 | if (strncmp(cur->varstr, str, name_len) != 0) { | ||
2863 | if (!cur->next) { | ||
2864 | /* Bail out. Note that now cur points | ||
2865 | * to last var in linked list */ | ||
2866 | break; | ||
2867 | niro | 532 | } |
2868 | niro | 816 | cur = cur->next; |
2869 | continue; | ||
2870 | niro | 532 | } |
2871 | niro | 816 | /* We found an existing var with this name */ |
2872 | *value = '\0'; | ||
2873 | if (cur->flg_read_only) { | ||
2874 | bb_error_msg("%s: readonly variable", str); | ||
2875 | free(str); | ||
2876 | return -1; | ||
2877 | niro | 532 | } |
2878 | niro | 816 | debug_printf_env("%s: unsetenv '%s'\n", __func__, str); |
2879 | unsetenv(str); /* just in case */ | ||
2880 | *value = '='; | ||
2881 | if (strcmp(cur->varstr, str) == 0) { | ||
2882 | free_and_exp: | ||
2883 | free(str); | ||
2884 | goto exp; | ||
2885 | } | ||
2886 | if (cur->max_len >= strlen(str)) { | ||
2887 | /* This one is from startup env, reuse space */ | ||
2888 | strcpy(cur->varstr, str); | ||
2889 | goto free_and_exp; | ||
2890 | } | ||
2891 | /* max_len == 0 signifies "malloced" var, which we can | ||
2892 | * (and has to) free */ | ||
2893 | if (!cur->max_len) | ||
2894 | free(cur->varstr); | ||
2895 | cur->max_len = 0; | ||
2896 | goto set_str_and_exp; | ||
2897 | niro | 532 | } |
2898 | |||
2899 | niro | 816 | /* Not found - create next variable struct */ |
2900 | cur->next = xzalloc(sizeof(*cur)); | ||
2901 | cur = cur->next; | ||
2902 | |||
2903 | set_str_and_exp: | ||
2904 | cur->varstr = str; | ||
2905 | exp: | ||
2906 | if (flg_export) | ||
2907 | cur->flg_export = 1; | ||
2908 | if (cur->flg_export) { | ||
2909 | debug_printf_env("%s: putenv '%s'\n", __func__, cur->varstr); | ||
2910 | return putenv(cur->varstr); | ||
2911 | niro | 532 | } |
2912 | niro | 816 | return 0; |
2913 | niro | 532 | } |
2914 | |||
2915 | static void unset_local_var(const char *name) | ||
2916 | { | ||
2917 | niro | 816 | struct variable *cur; |
2918 | struct variable *prev = prev; /* for gcc */ | ||
2919 | int name_len; | ||
2920 | niro | 532 | |
2921 | niro | 816 | if (!name) |
2922 | return; | ||
2923 | name_len = strlen(name); | ||
2924 | cur = G.top_var; | ||
2925 | while (cur) { | ||
2926 | if (strncmp(cur->varstr, name, name_len) == 0 && cur->varstr[name_len] == '=') { | ||
2927 | if (cur->flg_read_only) { | ||
2928 | niro | 532 | bb_error_msg("%s: readonly variable", name); |
2929 | return; | ||
2930 | } | ||
2931 | niro | 816 | /* prev is ok to use here because 1st variable, HUSH_VERSION, |
2932 | * is ro, and we cannot reach this code on the 1st pass */ | ||
2933 | prev->next = cur->next; | ||
2934 | debug_printf_env("%s: unsetenv '%s'\n", __func__, cur->varstr); | ||
2935 | unsetenv(cur->varstr); | ||
2936 | if (!cur->max_len) | ||
2937 | free(cur->varstr); | ||
2938 | niro | 532 | free(cur); |
2939 | niro | 816 | return; |
2940 | niro | 532 | } |
2941 | niro | 816 | prev = cur; |
2942 | cur = cur->next; | ||
2943 | niro | 532 | } |
2944 | } | ||
2945 | |||
2946 | niro | 816 | /* The src parameter allows us to peek forward to a possible &n syntax |
2947 | niro | 532 | * for file descriptor duplication, e.g., "2>&1". |
2948 | * Return code is 0 normally, 1 if a syntax error is detected in src. | ||
2949 | * Resource errors (in xmalloc) cause the process to exit */ | ||
2950 | niro | 816 | static int setup_redirect(struct parse_context *ctx, int fd, redir_type style, |
2951 | niro | 532 | struct in_str *input) |
2952 | { | ||
2953 | niro | 816 | struct command *command = ctx->command; |
2954 | struct redir_struct *redir = command->redirects; | ||
2955 | struct redir_struct *last_redir = NULL; | ||
2956 | niro | 532 | |
2957 | /* Create a new redir_struct and drop it onto the end of the linked list */ | ||
2958 | niro | 816 | while (redir) { |
2959 | last_redir = redir; | ||
2960 | redir = redir->next; | ||
2961 | niro | 532 | } |
2962 | niro | 816 | redir = xzalloc(sizeof(struct redir_struct)); |
2963 | /* redir->next = NULL; */ | ||
2964 | /* redir->rd_filename = NULL; */ | ||
2965 | niro | 532 | if (last_redir) { |
2966 | niro | 816 | last_redir->next = redir; |
2967 | niro | 532 | } else { |
2968 | niro | 816 | command->redirects = redir; |
2969 | niro | 532 | } |
2970 | |||
2971 | niro | 816 | redir->rd_type = style; |
2972 | redir->fd = (fd == -1) ? redir_table[style].default_fd : fd; | ||
2973 | niro | 532 | |
2974 | debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip); | ||
2975 | |||
2976 | /* Check for a '2>&1' type redirect */ | ||
2977 | redir->dup = redirect_dup_num(input); | ||
2978 | niro | 816 | if (redir->dup == -2) |
2979 | return 1; /* syntax error */ | ||
2980 | niro | 532 | if (redir->dup != -1) { |
2981 | /* Erik had a check here that the file descriptor in question | ||
2982 | * is legit; I postpone that to "run time" | ||
2983 | * A "-" representation of "close me" shows up as a -3 here */ | ||
2984 | debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup); | ||
2985 | } else { | ||
2986 | /* We do _not_ try to open the file that src points to, | ||
2987 | * since we need to return and let src be expanded first. | ||
2988 | * Set ctx->pending_redirect, so we know what to do at the | ||
2989 | niro | 816 | * end of the next parsed word. */ |
2990 | niro | 532 | ctx->pending_redirect = redir; |
2991 | } | ||
2992 | return 0; | ||
2993 | } | ||
2994 | |||
2995 | niro | 816 | static struct pipe *new_pipe(void) |
2996 | { | ||
2997 | niro | 532 | struct pipe *pi; |
2998 | niro | 816 | pi = xzalloc(sizeof(struct pipe)); |
2999 | /*pi->followup = 0; - deliberately invalid value */ | ||
3000 | /*pi->res_word = RES_NONE; - RES_NONE is 0 anyway */ | ||
3001 | niro | 532 | return pi; |
3002 | } | ||
3003 | |||
3004 | niro | 816 | static void initialize_context(struct parse_context *ctx) |
3005 | niro | 532 | { |
3006 | niro | 816 | memset(ctx, 0, sizeof(*ctx)); |
3007 | ctx->pipe = ctx->list_head = new_pipe(); | ||
3008 | /* Create the memory for command, roughly: | ||
3009 | * ctx->pipe->cmds = new struct command; | ||
3010 | * ctx->command = &ctx->pipe->cmds[0]; | ||
3011 | */ | ||
3012 | done_command(ctx); | ||
3013 | niro | 532 | } |
3014 | |||
3015 | niro | 816 | /* If a reserved word is found and processed, parse context is modified |
3016 | * and 1 is returned. | ||
3017 | * Handles if, then, elif, else, fi, for, while, until, do, done. | ||
3018 | niro | 532 | * case, function, and select are obnoxious, save those for later. |
3019 | */ | ||
3020 | niro | 816 | #if HAS_KEYWORDS |
3021 | struct reserved_combo { | ||
3022 | char literal[6]; | ||
3023 | unsigned char res; | ||
3024 | unsigned char assignment_flag; | ||
3025 | int flag; | ||
3026 | }; | ||
3027 | enum { | ||
3028 | FLAG_END = (1 << RES_NONE ), | ||
3029 | #if ENABLE_HUSH_IF | ||
3030 | FLAG_IF = (1 << RES_IF ), | ||
3031 | FLAG_THEN = (1 << RES_THEN ), | ||
3032 | FLAG_ELIF = (1 << RES_ELIF ), | ||
3033 | FLAG_ELSE = (1 << RES_ELSE ), | ||
3034 | FLAG_FI = (1 << RES_FI ), | ||
3035 | #endif | ||
3036 | #if ENABLE_HUSH_LOOPS | ||
3037 | FLAG_FOR = (1 << RES_FOR ), | ||
3038 | FLAG_WHILE = (1 << RES_WHILE), | ||
3039 | FLAG_UNTIL = (1 << RES_UNTIL), | ||
3040 | FLAG_DO = (1 << RES_DO ), | ||
3041 | FLAG_DONE = (1 << RES_DONE ), | ||
3042 | FLAG_IN = (1 << RES_IN ), | ||
3043 | #endif | ||
3044 | #if ENABLE_HUSH_CASE | ||
3045 | FLAG_MATCH = (1 << RES_MATCH), | ||
3046 | FLAG_ESAC = (1 << RES_ESAC ), | ||
3047 | #endif | ||
3048 | FLAG_START = (1 << RES_XXXX ), | ||
3049 | }; | ||
3050 | |||
3051 | static const struct reserved_combo* match_reserved_word(o_string *word) | ||
3052 | niro | 532 | { |
3053 | /* Mostly a list of accepted follow-up reserved words. | ||
3054 | * FLAG_END means we are done with the sequence, and are ready | ||
3055 | * to turn the compound list into a command. | ||
3056 | * FLAG_START means the word must start a new compound list. | ||
3057 | */ | ||
3058 | niro | 816 | static const struct reserved_combo reserved_list[] = { |
3059 | #if ENABLE_HUSH_IF | ||
3060 | { "!", RES_NONE, NOT_ASSIGNMENT , 0 }, | ||
3061 | { "if", RES_IF, WORD_IS_KEYWORD, FLAG_THEN | FLAG_START }, | ||
3062 | { "then", RES_THEN, WORD_IS_KEYWORD, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, | ||
3063 | { "elif", RES_ELIF, WORD_IS_KEYWORD, FLAG_THEN }, | ||
3064 | { "else", RES_ELSE, WORD_IS_KEYWORD, FLAG_FI }, | ||
3065 | { "fi", RES_FI, NOT_ASSIGNMENT , FLAG_END }, | ||
3066 | #endif | ||
3067 | #if ENABLE_HUSH_LOOPS | ||
3068 | { "for", RES_FOR, NOT_ASSIGNMENT , FLAG_IN | FLAG_DO | FLAG_START }, | ||
3069 | { "while", RES_WHILE, WORD_IS_KEYWORD, FLAG_DO | FLAG_START }, | ||
3070 | { "until", RES_UNTIL, WORD_IS_KEYWORD, FLAG_DO | FLAG_START }, | ||
3071 | { "in", RES_IN, NOT_ASSIGNMENT , FLAG_DO }, | ||
3072 | { "do", RES_DO, WORD_IS_KEYWORD, FLAG_DONE }, | ||
3073 | { "done", RES_DONE, NOT_ASSIGNMENT , FLAG_END }, | ||
3074 | #endif | ||
3075 | #if ENABLE_HUSH_CASE | ||
3076 | { "case", RES_CASE, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_START }, | ||
3077 | { "esac", RES_ESAC, NOT_ASSIGNMENT , FLAG_END }, | ||
3078 | #endif | ||
3079 | niro | 532 | }; |
3080 | niro | 816 | const struct reserved_combo *r; |
3081 | |||
3082 | for (r = reserved_list; r < reserved_list + ARRAY_SIZE(reserved_list); r++) { | ||
3083 | if (strcmp(word->data, r->literal) == 0) | ||
3084 | return r; | ||
3085 | } | ||
3086 | return NULL; | ||
3087 | } | ||
3088 | static int reserved_word(o_string *word, struct parse_context *ctx) | ||
3089 | { | ||
3090 | #if ENABLE_HUSH_CASE | ||
3091 | static const struct reserved_combo reserved_match = { | ||
3092 | "", RES_MATCH, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_ESAC | ||
3093 | }; | ||
3094 | #endif | ||
3095 | const struct reserved_combo *r; | ||
3096 | |||
3097 | r = match_reserved_word(word); | ||
3098 | if (!r) | ||
3099 | return 0; | ||
3100 | |||
3101 | debug_printf("found reserved word %s, res %d\n", r->literal, r->res); | ||
3102 | #if ENABLE_HUSH_CASE | ||
3103 | if (r->res == RES_IN && ctx->ctx_res_w == RES_CASE) | ||
3104 | /* "case word IN ..." - IN part starts first match part */ | ||
3105 | r = &reserved_match; | ||
3106 | else | ||
3107 | #endif | ||
3108 | if (r->flag == 0) { /* '!' */ | ||
3109 | if (ctx->ctx_inverted) { /* bash doesn't accept '! ! true' */ | ||
3110 | syntax(NULL); | ||
3111 | IF_HAS_KEYWORDS(ctx->ctx_res_w = RES_SNTX;) | ||
3112 | niro | 532 | } |
3113 | niro | 816 | ctx->ctx_inverted = 1; |
3114 | return 1; | ||
3115 | niro | 532 | } |
3116 | niro | 816 | if (r->flag & FLAG_START) { |
3117 | struct parse_context *new; | ||
3118 | debug_printf("push stack\n"); | ||
3119 | new = xmalloc(sizeof(*new)); | ||
3120 | *new = *ctx; /* physical copy */ | ||
3121 | initialize_context(ctx); | ||
3122 | ctx->stack = new; | ||
3123 | } else if (/*ctx->ctx_res_w == RES_NONE ||*/ !(ctx->old_flag & (1 << r->res))) { | ||
3124 | syntax(NULL); | ||
3125 | ctx->ctx_res_w = RES_SNTX; | ||
3126 | return 1; | ||
3127 | } | ||
3128 | ctx->ctx_res_w = r->res; | ||
3129 | ctx->old_flag = r->flag; | ||
3130 | if (ctx->old_flag & FLAG_END) { | ||
3131 | struct parse_context *old; | ||
3132 | debug_printf("pop stack\n"); | ||
3133 | done_pipe(ctx, PIPE_SEQ); | ||
3134 | old = ctx->stack; | ||
3135 | old->command->group = ctx->list_head; | ||
3136 | old->command->grp_type = GRP_NORMAL; | ||
3137 | *ctx = *old; /* physical copy */ | ||
3138 | free(old); | ||
3139 | } | ||
3140 | word->o_assignment = r->assignment_flag; | ||
3141 | return 1; | ||
3142 | niro | 532 | } |
3143 | niro | 816 | #endif |
3144 | niro | 532 | |
3145 | niro | 816 | //TODO: many, many callers don't check error from done_word() |
3146 | |||
3147 | /* Word is complete, look at it and update parsing context. | ||
3148 | * Normal return is 0. Syntax errors return 1. */ | ||
3149 | static int done_word(o_string *word, struct parse_context *ctx) | ||
3150 | niro | 532 | { |
3151 | niro | 816 | struct command *command = ctx->command; |
3152 | niro | 532 | |
3153 | niro | 816 | debug_printf_parse("done_word entered: '%s' %p\n", word->data, command); |
3154 | if (word->length == 0 && word->nonnull == 0) { | ||
3155 | debug_printf_parse("done_word return 0: true null, ignored\n"); | ||
3156 | niro | 532 | return 0; |
3157 | } | ||
3158 | niro | 816 | /* If this word wasn't an assignment, next ones definitely |
3159 | * can't be assignments. Even if they look like ones. */ | ||
3160 | if (word->o_assignment != DEFINITELY_ASSIGNMENT | ||
3161 | && word->o_assignment != WORD_IS_KEYWORD | ||
3162 | ) { | ||
3163 | word->o_assignment = NOT_ASSIGNMENT; | ||
3164 | niro | 532 | } else { |
3165 | niro | 816 | if (word->o_assignment == DEFINITELY_ASSIGNMENT) |
3166 | command->assignment_cnt++; | ||
3167 | word->o_assignment = MAYBE_ASSIGNMENT; | ||
3168 | niro | 532 | } |
3169 | |||
3170 | if (ctx->pending_redirect) { | ||
3171 | niro | 816 | /* We do not glob in e.g. >*.tmp case. bash seems to glob here |
3172 | * only if run as "bash", not "sh" */ | ||
3173 | ctx->pending_redirect->rd_filename = xstrdup(word->data); | ||
3174 | word->o_assignment = NOT_ASSIGNMENT; | ||
3175 | debug_printf("word stored in rd_filename: '%s'\n", word->data); | ||
3176 | } else { | ||
3177 | /* "{ echo foo; } echo bar" - bad */ | ||
3178 | /* NB: bash allows e.g. "if true; then { echo foo; } fi". TODO? */ | ||
3179 | if (command->group) { | ||
3180 | syntax(NULL); | ||
3181 | debug_printf_parse("done_word return 1: syntax error, groups and arglists don't mix\n"); | ||
3182 | niro | 532 | return 1; |
3183 | } | ||
3184 | niro | 816 | #if HAS_KEYWORDS |
3185 | #if ENABLE_HUSH_CASE | ||
3186 | if (ctx->ctx_dsemicolon | ||
3187 | && strcmp(word->data, "esac") != 0 /* not "... pattern) cmd;; esac" */ | ||
3188 | ) { | ||
3189 | /* already done when ctx_dsemicolon was set to 1: */ | ||
3190 | /* ctx->ctx_res_w = RES_MATCH; */ | ||
3191 | ctx->ctx_dsemicolon = 0; | ||
3192 | } else | ||
3193 | #endif | ||
3194 | |||
3195 | if (!command->argv /* if it's the first word... */ | ||
3196 | #if ENABLE_HUSH_LOOPS | ||
3197 | && ctx->ctx_res_w != RES_FOR /* ...not after FOR or IN */ | ||
3198 | && ctx->ctx_res_w != RES_IN | ||
3199 | #endif | ||
3200 | ) { | ||
3201 | debug_printf_parse(": checking '%s' for reserved-ness\n", word->data); | ||
3202 | if (reserved_word(word, ctx)) { | ||
3203 | o_reset(word); | ||
3204 | debug_printf_parse("done_word return %d\n", (ctx->ctx_res_w == RES_SNTX)); | ||
3205 | return (ctx->ctx_res_w == RES_SNTX); | ||
3206 | } | ||
3207 | } | ||
3208 | #endif | ||
3209 | if (word->nonnull /* word had "xx" or 'xx' at least as part of it. */ | ||
3210 | /* optimization: and if it's ("" or '') or ($v... or `cmd`...): */ | ||
3211 | && (word->data[0] == '\0' || word->data[0] == SPECIAL_VAR_SYMBOL) | ||
3212 | /* (otherwise it's known to be not empty and is already safe) */ | ||
3213 | ) { | ||
3214 | /* exclude "$@" - it can expand to no word despite "" */ | ||
3215 | char *p = word->data; | ||
3216 | while (p[0] == SPECIAL_VAR_SYMBOL | ||
3217 | && (p[1] & 0x7f) == '@' | ||
3218 | && p[2] == SPECIAL_VAR_SYMBOL | ||
3219 | ) { | ||
3220 | p += 3; | ||
3221 | } | ||
3222 | if (p == word->data || p[0] != '\0') { | ||
3223 | /* saw no "$@", or not only "$@" but some | ||
3224 | * real text is there too */ | ||
3225 | /* insert "empty variable" reference, this makes | ||
3226 | * e.g. "", $empty"" etc to not disappear */ | ||
3227 | o_addchr(word, SPECIAL_VAR_SYMBOL); | ||
3228 | o_addchr(word, SPECIAL_VAR_SYMBOL); | ||
3229 | } | ||
3230 | } | ||
3231 | command->argv = add_string_to_strings(command->argv, xstrdup(word->data)); | ||
3232 | debug_print_strings("word appended to argv", command->argv); | ||
3233 | niro | 532 | } |
3234 | niro | 816 | |
3235 | o_reset(word); | ||
3236 | ctx->pending_redirect = NULL; | ||
3237 | |||
3238 | #if ENABLE_HUSH_LOOPS | ||
3239 | /* Force FOR to have just one word (variable name) */ | ||
3240 | /* NB: basically, this makes hush see "for v in ..." syntax as if | ||
3241 | * as it is "for v; in ...". FOR and IN become two pipe structs | ||
3242 | * in parse tree. */ | ||
3243 | if (ctx->ctx_res_w == RES_FOR) { | ||
3244 | //TODO: check that command->argv[0] is a valid variable name! | ||
3245 | done_pipe(ctx, PIPE_SEQ); | ||
3246 | niro | 532 | } |
3247 | niro | 816 | #endif |
3248 | #if ENABLE_HUSH_CASE | ||
3249 | /* Force CASE to have just one word */ | ||
3250 | if (ctx->ctx_res_w == RES_CASE) { | ||
3251 | done_pipe(ctx, PIPE_SEQ); | ||
3252 | } | ||
3253 | #endif | ||
3254 | debug_printf_parse("done_word return 0\n"); | ||
3255 | niro | 532 | return 0; |
3256 | } | ||
3257 | |||
3258 | niro | 816 | /* Command (member of a pipe) is complete. The only possible error here |
3259 | * is out of memory, in which case xmalloc exits. */ | ||
3260 | static int done_command(struct parse_context *ctx) | ||
3261 | niro | 532 | { |
3262 | niro | 816 | /* The command is really already in the pipe structure, so |
3263 | * advance the pipe counter and make a new, null command. */ | ||
3264 | struct pipe *pi = ctx->pipe; | ||
3265 | struct command *command = ctx->command; | ||
3266 | niro | 532 | |
3267 | niro | 816 | if (command) { |
3268 | if (command->group == NULL | ||
3269 | && command->argv == NULL | ||
3270 | && command->redirects == NULL | ||
3271 | ) { | ||
3272 | debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds); | ||
3273 | return pi->num_cmds; | ||
3274 | } | ||
3275 | pi->num_cmds++; | ||
3276 | debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds); | ||
3277 | niro | 532 | } else { |
3278 | niro | 816 | debug_printf_parse("done_command: initializing, num_cmds=%d\n", pi->num_cmds); |
3279 | niro | 532 | } |
3280 | |||
3281 | niro | 816 | /* Only real trickiness here is that the uncommitted |
3282 | * command structure is not counted in pi->num_cmds. */ | ||
3283 | pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1)); | ||
3284 | command = &pi->cmds[pi->num_cmds]; | ||
3285 | memset(command, 0, sizeof(*command)); | ||
3286 | niro | 532 | |
3287 | niro | 816 | ctx->command = command; |
3288 | niro | 532 | /* but ctx->pipe and ctx->list_head remain unchanged */ |
3289 | niro | 816 | |
3290 | return pi->num_cmds; /* used only for 0/nonzero check */ | ||
3291 | niro | 532 | } |
3292 | |||
3293 | niro | 816 | static void done_pipe(struct parse_context *ctx, pipe_style type) |
3294 | niro | 532 | { |
3295 | niro | 816 | int not_null; |
3296 | |||
3297 | debug_printf_parse("done_pipe entered, followup %d\n", type); | ||
3298 | /* Close previous command */ | ||
3299 | not_null = done_command(ctx); | ||
3300 | niro | 532 | ctx->pipe->followup = type; |
3301 | niro | 816 | IF_HAS_KEYWORDS(ctx->pipe->pi_inverted = ctx->ctx_inverted;) |
3302 | IF_HAS_KEYWORDS(ctx->ctx_inverted = 0;) | ||
3303 | IF_HAS_KEYWORDS(ctx->pipe->res_word = ctx->ctx_res_w;) | ||
3304 | |||
3305 | /* Without this check, even just <enter> on command line generates | ||
3306 | * tree of three NOPs (!). Which is harmless but annoying. | ||
3307 | * IOW: it is safe to do it unconditionally. | ||
3308 | * RES_NONE case is for "for a in; do ..." (empty IN set) | ||
3309 | * to work, possibly other cases too. */ | ||
3310 | if (not_null IF_HAS_KEYWORDS(|| ctx->ctx_res_w != RES_NONE)) { | ||
3311 | struct pipe *new_p; | ||
3312 | debug_printf_parse("done_pipe: adding new pipe: " | ||
3313 | "not_null:%d ctx->ctx_res_w:%d\n", | ||
3314 | not_null, ctx->ctx_res_w); | ||
3315 | new_p = new_pipe(); | ||
3316 | ctx->pipe->next = new_p; | ||
3317 | ctx->pipe = new_p; | ||
3318 | ctx->command = NULL; /* needed! */ | ||
3319 | /* RES_THEN, RES_DO etc are "sticky" - | ||
3320 | * they remain set for commands inside if/while. | ||
3321 | * This is used to control execution. | ||
3322 | * RES_FOR and RES_IN are NOT sticky (needed to support | ||
3323 | * cases where variable or value happens to match a keyword): | ||
3324 | */ | ||
3325 | #if ENABLE_HUSH_LOOPS | ||
3326 | if (ctx->ctx_res_w == RES_FOR | ||
3327 | || ctx->ctx_res_w == RES_IN) | ||
3328 | ctx->ctx_res_w = RES_NONE; | ||
3329 | #endif | ||
3330 | #if ENABLE_HUSH_CASE | ||
3331 | if (ctx->ctx_res_w == RES_MATCH) | ||
3332 | ctx->ctx_res_w = RES_CASEI; | ||
3333 | #endif | ||
3334 | /* Create the memory for command, roughly: | ||
3335 | * ctx->pipe->cmds = new struct command; | ||
3336 | * ctx->command = &ctx->pipe->cmds[0]; | ||
3337 | */ | ||
3338 | done_command(ctx); | ||
3339 | } | ||
3340 | debug_printf_parse("done_pipe return\n"); | ||
3341 | niro | 532 | } |
3342 | |||
3343 | niro | 816 | /* Peek ahead in the in_str to find out if we have a "&n" construct, |
3344 | niro | 532 | * as in "2>&1", that represents duplicating a file descriptor. |
3345 | niro | 816 | * Return either -2 (syntax error), -1 (no &), or the number found. |
3346 | niro | 532 | */ |
3347 | static int redirect_dup_num(struct in_str *input) | ||
3348 | { | ||
3349 | niro | 816 | int ch, d = 0, ok = 0; |
3350 | ch = i_peek(input); | ||
3351 | niro | 532 | if (ch != '&') return -1; |
3352 | |||
3353 | niro | 816 | i_getch(input); /* get the & */ |
3354 | ch = i_peek(input); | ||
3355 | niro | 532 | if (ch == '-') { |
3356 | niro | 816 | i_getch(input); |
3357 | niro | 532 | return -3; /* "-" represents "close me" */ |
3358 | } | ||
3359 | while (isdigit(ch)) { | ||
3360 | niro | 816 | d = d*10 + (ch-'0'); |
3361 | ok = 1; | ||
3362 | i_getch(input); | ||
3363 | ch = i_peek(input); | ||
3364 | niro | 532 | } |
3365 | if (ok) return d; | ||
3366 | |||
3367 | bb_error_msg("ambiguous redirect"); | ||
3368 | return -2; | ||
3369 | } | ||
3370 | |||
3371 | /* If a redirect is immediately preceded by a number, that number is | ||
3372 | * supposed to tell which file descriptor to redirect. This routine | ||
3373 | * looks for such preceding numbers. In an ideal world this routine | ||
3374 | * needs to handle all the following classes of redirects... | ||
3375 | * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo | ||
3376 | * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo | ||
3377 | * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo | ||
3378 | * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo | ||
3379 | * A -1 output from this program means no valid number was found, so the | ||
3380 | * caller should use the appropriate default for this redirection. | ||
3381 | */ | ||
3382 | static int redirect_opt_num(o_string *o) | ||
3383 | { | ||
3384 | int num; | ||
3385 | |||
3386 | niro | 816 | if (o->length == 0) |
3387 | return -1; | ||
3388 | for (num = 0; num < o->length; num++) { | ||
3389 | if (!isdigit(o->data[num])) { | ||
3390 | niro | 532 | return -1; |
3391 | } | ||
3392 | } | ||
3393 | niro | 816 | num = atoi(o->data); |
3394 | o_reset(o); | ||
3395 | niro | 532 | return num; |
3396 | } | ||
3397 | |||
3398 | niro | 816 | #if ENABLE_HUSH_TICK |
3399 | niro | 532 | static FILE *generate_stream_from_list(struct pipe *head) |
3400 | { | ||
3401 | FILE *pf; | ||
3402 | int pid, channel[2]; | ||
3403 | niro | 816 | |
3404 | xpipe(channel); | ||
3405 | /* *** NOMMU WARNING *** */ | ||
3406 | /* By using vfork here, we suspend parent till child exits or execs. | ||
3407 | * If child will not do it before it fills the pipe, it can block forever | ||
3408 | * in write(STDOUT_FILENO), and parent (shell) will be also stuck. | ||
3409 | * Try this script: | ||
3410 | * yes "0123456789012345678901234567890" | dd bs=32 count=64k >TESTFILE | ||
3411 | * huge=`cat TESTFILE` # will block here forever | ||
3412 | * echo OK | ||
3413 | */ | ||
3414 | pid = BB_MMU ? fork() : vfork(); | ||
3415 | if (pid < 0) | ||
3416 | bb_perror_msg_and_die(BB_MMU ? "fork" : "vfork"); | ||
3417 | if (pid == 0) { /* child */ | ||
3418 | if (ENABLE_HUSH_JOB) | ||
3419 | die_sleep = 0; /* let nofork's xfuncs die */ | ||
3420 | close(channel[0]); /* NB: close _first_, then move fd! */ | ||
3421 | xmove_fd(channel[1], 1); | ||
3422 | /* Prevent it from trying to handle ctrl-z etc */ | ||
3423 | #if ENABLE_HUSH_JOB | ||
3424 | G.run_list_level = 1; | ||
3425 | niro | 532 | #endif |
3426 | niro | 816 | /* Process substitution is not considered to be usual |
3427 | * 'command execution'. | ||
3428 | * SUSv3 says ctrl-Z should be ignored, ctrl-C should not. */ | ||
3429 | /* Not needed, we are relying on it being disabled | ||
3430 | * everywhere outside actual command execution. */ | ||
3431 | /*set_jobctrl_sighandler(SIG_IGN);*/ | ||
3432 | set_misc_sighandler(SIG_DFL); | ||
3433 | /* Freeing 'head' here would break NOMMU. */ | ||
3434 | _exit(run_list(head)); | ||
3435 | niro | 532 | } |
3436 | close(channel[1]); | ||
3437 | niro | 816 | pf = fdopen(channel[0], "r"); |
3438 | niro | 532 | return pf; |
3439 | niro | 816 | /* 'head' is freed by the caller */ |
3440 | niro | 532 | } |
3441 | |||
3442 | niro | 816 | /* Return code is exit status of the process that is run. */ |
3443 | static int process_command_subs(o_string *dest, | ||
3444 | struct in_str *input, | ||
3445 | const char *subst_end) | ||
3446 | niro | 532 | { |
3447 | niro | 816 | int retcode, ch, eol_cnt; |
3448 | o_string result = NULL_O_STRING; | ||
3449 | struct parse_context inner; | ||
3450 | niro | 532 | FILE *p; |
3451 | struct in_str pipe_str; | ||
3452 | niro | 816 | |
3453 | niro | 532 | initialize_context(&inner); |
3454 | |||
3455 | niro | 816 | /* Recursion to generate command */ |
3456 | niro | 532 | retcode = parse_stream(&result, &inner, input, subst_end); |
3457 | niro | 816 | if (retcode != 0) |
3458 | return retcode; /* syntax error or EOF */ | ||
3459 | niro | 532 | done_word(&result, &inner); |
3460 | done_pipe(&inner, PIPE_SEQ); | ||
3461 | niro | 816 | o_free(&result); |
3462 | niro | 532 | |
3463 | niro | 816 | p = generate_stream_from_list(inner.list_head); |
3464 | if (p == NULL) | ||
3465 | return 1; | ||
3466 | close_on_exec_on(fileno(p)); | ||
3467 | niro | 532 | setup_file_in_str(&pipe_str, p); |
3468 | |||
3469 | niro | 816 | /* Now send results of command back into original context */ |
3470 | eol_cnt = 0; | ||
3471 | while ((ch = i_getch(&pipe_str)) != EOF) { | ||
3472 | if (ch == '\n') { | ||
3473 | eol_cnt++; | ||
3474 | continue; | ||
3475 | } | ||
3476 | while (eol_cnt) { | ||
3477 | o_addchr(dest, '\n'); | ||
3478 | eol_cnt--; | ||
3479 | } | ||
3480 | o_addQchr(dest, ch); | ||
3481 | niro | 532 | } |
3482 | |||
3483 | debug_printf("done reading from pipe, pclose()ing\n"); | ||
3484 | /* This is the step that wait()s for the child. Should be pretty | ||
3485 | * safe, since we just read an EOF from its stdout. We could try | ||
3486 | niro | 816 | * to do better, by using wait(), and keeping track of background jobs |
3487 | niro | 532 | * at the same time. That would be a lot of work, and contrary |
3488 | * to the KISS philosophy of this program. */ | ||
3489 | niro | 816 | retcode = fclose(p); |
3490 | free_pipe_list(inner.list_head, /* indent: */ 0); | ||
3491 | debug_printf("closed FILE from child, retcode=%d\n", retcode); | ||
3492 | niro | 532 | return retcode; |
3493 | } | ||
3494 | niro | 816 | #endif |
3495 | niro | 532 | |
3496 | niro | 816 | static int parse_group(o_string *dest, struct parse_context *ctx, |
3497 | niro | 532 | struct in_str *input, int ch) |
3498 | { | ||
3499 | niro | 816 | /* dest contains characters seen prior to ( or {. |
3500 | * Typically it's empty, but for functions defs, | ||
3501 | * it contains function name (without '()'). */ | ||
3502 | int rcode; | ||
3503 | const char *endch = NULL; | ||
3504 | struct parse_context sub; | ||
3505 | struct command *command = ctx->command; | ||
3506 | |||
3507 | debug_printf_parse("parse_group entered\n"); | ||
3508 | #if ENABLE_HUSH_FUNCTIONS | ||
3509 | if (ch == 'F') { /* function definition? */ | ||
3510 | bb_error_msg("aha '%s' is a function, parsing it...", dest->data); | ||
3511 | //command->fname = dest->data; | ||
3512 | command->grp_type = GRP_FUNCTION; | ||
3513 | //TODO: review every o_reset() location... do they handle all o_string fields correctly? | ||
3514 | memset(dest, 0, sizeof(*dest)); | ||
3515 | niro | 532 | } |
3516 | niro | 816 | #endif |
3517 | if (command->argv /* word [word](... */ | ||
3518 | || dest->length /* word(... */ | ||
3519 | || dest->nonnull /* ""(... */ | ||
3520 | ) { | ||
3521 | syntax(NULL); | ||
3522 | debug_printf_parse("parse_group return 1: syntax error, groups and arglists don't mix\n"); | ||
3523 | return 1; | ||
3524 | } | ||
3525 | niro | 532 | initialize_context(&sub); |
3526 | niro | 816 | endch = "}"; |
3527 | if (ch == '(') { | ||
3528 | endch = ")"; | ||
3529 | command->grp_type = GRP_SUBSHELL; | ||
3530 | niro | 532 | } |
3531 | niro | 816 | rcode = parse_stream(dest, &sub, input, endch); |
3532 | if (rcode == 0) { | ||
3533 | done_word(dest, &sub); /* finish off the final word in the subcontext */ | ||
3534 | done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */ | ||
3535 | command->group = sub.list_head; | ||
3536 | } | ||
3537 | debug_printf_parse("parse_group return %d\n", rcode); | ||
3538 | niro | 532 | return rcode; |
3539 | niro | 816 | /* command remains "open", available for possible redirects */ |
3540 | niro | 532 | } |
3541 | |||
3542 | niro | 816 | /* Basically useful version until someone wants to get fancier, |
3543 | niro | 532 | * see the bash man page under "Parameter Expansion" */ |
3544 | niro | 816 | static const char *lookup_param(const char *src) |
3545 | niro | 532 | { |
3546 | niro | 816 | struct variable *var = get_local_var(src); |
3547 | if (var) | ||
3548 | return strchr(var->varstr, '=') + 1; | ||
3549 | return NULL; | ||
3550 | } | ||
3551 | |||
3552 | #if ENABLE_HUSH_TICK | ||
3553 | /* Subroutines for copying $(...) and `...` things */ | ||
3554 | static void add_till_backquote(o_string *dest, struct in_str *input); | ||
3555 | /* '...' */ | ||
3556 | static void add_till_single_quote(o_string *dest, struct in_str *input) | ||
3557 | { | ||
3558 | while (1) { | ||
3559 | int ch = i_getch(input); | ||
3560 | if (ch == EOF) | ||
3561 | break; | ||
3562 | if (ch == '\'') | ||
3563 | break; | ||
3564 | o_addchr(dest, ch); | ||
3565 | niro | 532 | } |
3566 | } | ||
3567 | niro | 816 | /* "...\"...`..`...." - do we need to handle "...$(..)..." too? */ |
3568 | static void add_till_double_quote(o_string *dest, struct in_str *input) | ||
3569 | { | ||
3570 | while (1) { | ||
3571 | int ch = i_getch(input); | ||
3572 | if (ch == '"') | ||
3573 | break; | ||
3574 | if (ch == '\\') { /* \x. Copy both chars. */ | ||
3575 | o_addchr(dest, ch); | ||
3576 | ch = i_getch(input); | ||
3577 | } | ||
3578 | if (ch == EOF) | ||
3579 | break; | ||
3580 | o_addchr(dest, ch); | ||
3581 | if (ch == '`') { | ||
3582 | add_till_backquote(dest, input); | ||
3583 | o_addchr(dest, ch); | ||
3584 | continue; | ||
3585 | } | ||
3586 | //if (ch == '$') ... | ||
3587 | } | ||
3588 | } | ||
3589 | /* Process `cmd` - copy contents until "`" is seen. Complicated by | ||
3590 | * \` quoting. | ||
3591 | * "Within the backquoted style of command substitution, backslash | ||
3592 | * shall retain its literal meaning, except when followed by: '$', '`', or '\'. | ||
3593 | * The search for the matching backquote shall be satisfied by the first | ||
3594 | * backquote found without a preceding backslash; during this search, | ||
3595 | * if a non-escaped backquote is encountered within a shell comment, | ||
3596 | * a here-document, an embedded command substitution of the $(command) | ||
3597 | * form, or a quoted string, undefined results occur. A single-quoted | ||
3598 | * or double-quoted string that begins, but does not end, within the | ||
3599 | * "`...`" sequence produces undefined results." | ||
3600 | * Example Output | ||
3601 | * echo `echo '\'TEST\`echo ZZ\`BEST` \TESTZZBEST | ||
3602 | */ | ||
3603 | static void add_till_backquote(o_string *dest, struct in_str *input) | ||
3604 | { | ||
3605 | while (1) { | ||
3606 | int ch = i_getch(input); | ||
3607 | if (ch == '`') | ||
3608 | break; | ||
3609 | if (ch == '\\') { /* \x. Copy both chars unless it is \` */ | ||
3610 | int ch2 = i_getch(input); | ||
3611 | if (ch2 != '`' && ch2 != '$' && ch2 != '\\') | ||
3612 | o_addchr(dest, ch); | ||
3613 | ch = ch2; | ||
3614 | } | ||
3615 | if (ch == EOF) | ||
3616 | break; | ||
3617 | o_addchr(dest, ch); | ||
3618 | } | ||
3619 | } | ||
3620 | /* Process $(cmd) - copy contents until ")" is seen. Complicated by | ||
3621 | * quoting and nested ()s. | ||
3622 | * "With the $(command) style of command substitution, all characters | ||
3623 | * following the open parenthesis to the matching closing parenthesis | ||
3624 | * constitute the command. Any valid shell script can be used for command, | ||
3625 | * except a script consisting solely of redirections which produces | ||
3626 | * unspecified results." | ||
3627 | * Example Output | ||
3628 | * echo $(echo '(TEST)' BEST) (TEST) BEST | ||
3629 | * echo $(echo 'TEST)' BEST) TEST) BEST | ||
3630 | * echo $(echo \(\(TEST\) BEST) ((TEST) BEST | ||
3631 | */ | ||
3632 | static void add_till_closing_curly_brace(o_string *dest, struct in_str *input) | ||
3633 | { | ||
3634 | int count = 0; | ||
3635 | while (1) { | ||
3636 | int ch = i_getch(input); | ||
3637 | if (ch == EOF) | ||
3638 | break; | ||
3639 | if (ch == '(') | ||
3640 | count++; | ||
3641 | if (ch == ')') | ||
3642 | if (--count < 0) | ||
3643 | break; | ||
3644 | o_addchr(dest, ch); | ||
3645 | if (ch == '\'') { | ||
3646 | add_till_single_quote(dest, input); | ||
3647 | o_addchr(dest, ch); | ||
3648 | continue; | ||
3649 | } | ||
3650 | if (ch == '"') { | ||
3651 | add_till_double_quote(dest, input); | ||
3652 | o_addchr(dest, ch); | ||
3653 | continue; | ||
3654 | } | ||
3655 | if (ch == '\\') { /* \x. Copy verbatim. Important for \(, \) */ | ||
3656 | ch = i_getch(input); | ||
3657 | if (ch == EOF) | ||
3658 | break; | ||
3659 | o_addchr(dest, ch); | ||
3660 | continue; | ||
3661 | } | ||
3662 | } | ||
3663 | } | ||
3664 | #endif /* ENABLE_HUSH_TICK */ | ||
3665 | niro | 532 | |
3666 | niro | 816 | /* Return code: 0 for OK, 1 for syntax error */ |
3667 | static int handle_dollar(o_string *dest, struct in_str *input) | ||
3668 | niro | 532 | { |
3669 | niro | 816 | int ch = i_peek(input); /* first character after the $ */ |
3670 | unsigned char quote_mask = dest->o_quote ? 0x80 : 0; | ||
3671 | |||
3672 | debug_printf_parse("handle_dollar entered: ch='%c'\n", ch); | ||
3673 | niro | 532 | if (isalpha(ch)) { |
3674 | niro | 816 | i_getch(input); |
3675 | make_var: | ||
3676 | o_addchr(dest, SPECIAL_VAR_SYMBOL); | ||
3677 | while (1) { | ||
3678 | debug_printf_parse(": '%c'\n", ch); | ||
3679 | o_addchr(dest, ch | quote_mask); | ||
3680 | quote_mask = 0; | ||
3681 | ch = i_peek(input); | ||
3682 | if (!isalnum(ch) && ch != '_') | ||
3683 | break; | ||
3684 | i_getch(input); | ||
3685 | niro | 532 | } |
3686 | niro | 816 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
3687 | niro | 532 | } else if (isdigit(ch)) { |
3688 | niro | 816 | make_one_char_var: |
3689 | i_getch(input); | ||
3690 | o_addchr(dest, SPECIAL_VAR_SYMBOL); | ||
3691 | debug_printf_parse(": '%c'\n", ch); | ||
3692 | o_addchr(dest, ch | quote_mask); | ||
3693 | o_addchr(dest, SPECIAL_VAR_SYMBOL); | ||
3694 | niro | 532 | } else switch (ch) { |
3695 | niro | 816 | case '$': /* pid */ |
3696 | case '!': /* last bg pid */ | ||
3697 | case '?': /* last exit code */ | ||
3698 | case '#': /* number of args */ | ||
3699 | case '*': /* args */ | ||
3700 | case '@': /* args */ | ||
3701 | goto make_one_char_var; | ||
3702 | niro | 532 | case '{': |
3703 | niro | 816 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
3704 | i_getch(input); | ||
3705 | niro | 532 | /* XXX maybe someone will try to escape the '}' */ |
3706 | niro | 816 | while (1) { |
3707 | ch = i_getch(input); | ||
3708 | if (ch == '}') | ||
3709 | break; | ||
3710 | if (!isalnum(ch) && ch != '_') { | ||
3711 | syntax("unterminated ${name}"); | ||
3712 | debug_printf_parse("handle_dollar return 1: unterminated ${name}\n"); | ||
3713 | return 1; | ||
3714 | } | ||
3715 | debug_printf_parse(": '%c'\n", ch); | ||
3716 | o_addchr(dest, ch | quote_mask); | ||
3717 | quote_mask = 0; | ||
3718 | niro | 532 | } |
3719 | niro | 816 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
3720 | niro | 532 | break; |
3721 | niro | 816 | #if ENABLE_HUSH_TICK |
3722 | case '(': { | ||
3723 | //int pos = dest->length; | ||
3724 | i_getch(input); | ||
3725 | o_addchr(dest, SPECIAL_VAR_SYMBOL); | ||
3726 | o_addchr(dest, quote_mask | '`'); | ||
3727 | add_till_closing_curly_brace(dest, input); | ||
3728 | //debug_printf_subst("SUBST RES2 '%s'\n", dest->data + pos); | ||
3729 | o_addchr(dest, SPECIAL_VAR_SYMBOL); | ||
3730 | niro | 532 | break; |
3731 | niro | 816 | } |
3732 | #endif | ||
3733 | case '_': | ||
3734 | i_getch(input); | ||
3735 | ch = i_peek(input); | ||
3736 | if (isalnum(ch)) { /* it's $_name or $_123 */ | ||
3737 | ch = '_'; | ||
3738 | goto make_var; | ||
3739 | niro | 532 | } |
3740 | niro | 816 | /* else: it's $_ */ |
3741 | niro | 532 | case '-': |
3742 | /* still unhandled, but should be eventually */ | ||
3743 | niro | 816 | bb_error_msg("unhandled syntax: $%c", ch); |
3744 | niro | 532 | return 1; |
3745 | break; | ||
3746 | default: | ||
3747 | niro | 816 | o_addQchr(dest, '$'); |
3748 | niro | 532 | } |
3749 | niro | 816 | debug_printf_parse("handle_dollar return 0\n"); |
3750 | niro | 532 | return 0; |
3751 | } | ||
3752 | |||
3753 | niro | 816 | /* Scan input, call done_word() whenever full IFS delimited word was seen. |
3754 | * Call done_pipe if '\n' was seen (and end_trigger != NULL). | ||
3755 | * Return code is 0 if end_trigger char is met, | ||
3756 | * -1 on EOF (but if end_trigger == NULL then return 0), | ||
3757 | * 1 for syntax error */ | ||
3758 | static int parse_stream(o_string *dest, struct parse_context *ctx, | ||
3759 | struct in_str *input, const char *end_trigger) | ||
3760 | niro | 532 | { |
3761 | int ch, m; | ||
3762 | int redir_fd; | ||
3763 | redir_type redir_style; | ||
3764 | niro | 816 | int shadow_quote = dest->o_quote; |
3765 | niro | 532 | int next; |
3766 | |||
3767 | niro | 816 | /* Only double-quote state is handled in the state variable dest->o_quote. |
3768 | niro | 532 | * A single-quote triggers a bypass of the main loop until its mate is |
3769 | niro | 816 | * found. When recursing, quote state is passed in via dest->o_quote. */ |
3770 | niro | 532 | |
3771 | niro | 816 | debug_printf_parse("parse_stream entered, end_trigger='%s' dest->o_assignment:%d\n", end_trigger, dest->o_assignment); |
3772 | |||
3773 | while (1) { | ||
3774 | m = CHAR_IFS; | ||
3775 | next = '\0'; | ||
3776 | ch = i_getch(input); | ||
3777 | if (ch != EOF) { | ||
3778 | m = G.charmap[ch]; | ||
3779 | if (ch != '\n') { | ||
3780 | next = i_peek(input); | ||
3781 | } | ||
3782 | } | ||
3783 | debug_printf_parse(": ch=%c (%d) m=%d quote=%d\n", | ||
3784 | ch, ch, m, dest->o_quote); | ||
3785 | if (m == CHAR_ORDINARY | ||
3786 | || (m != CHAR_SPECIAL && shadow_quote) | ||
3787 | ) { | ||
3788 | if (ch == EOF) { | ||
3789 | syntax("unterminated \""); | ||
3790 | debug_printf_parse("parse_stream return 1: unterminated \"\n"); | ||
3791 | return 1; | ||
3792 | } | ||
3793 | o_addQchr(dest, ch); | ||
3794 | if ((dest->o_assignment == MAYBE_ASSIGNMENT | ||
3795 | || dest->o_assignment == WORD_IS_KEYWORD) | ||
3796 | && ch == '=' | ||
3797 | && is_assignment(dest->data) | ||
3798 | ) { | ||
3799 | dest->o_assignment = DEFINITELY_ASSIGNMENT; | ||
3800 | } | ||
3801 | continue; | ||
3802 | } | ||
3803 | if (m == CHAR_IFS) { | ||
3804 | if (done_word(dest, ctx)) { | ||
3805 | debug_printf_parse("parse_stream return 1: done_word!=0\n"); | ||
3806 | return 1; | ||
3807 | } | ||
3808 | if (ch == EOF) | ||
3809 | break; | ||
3810 | /* If we aren't performing a substitution, treat | ||
3811 | * a newline as a command separator. | ||
3812 | * [why we don't handle it exactly like ';'? --vda] */ | ||
3813 | if (end_trigger && ch == '\n') { | ||
3814 | #if ENABLE_HUSH_CASE | ||
3815 | /* "case ... in <newline> word) ..." - | ||
3816 | * newlines are ignored (but ';' wouldn't be) */ | ||
3817 | if (dest->length == 0 // && argv[0] == NULL | ||
3818 | && ctx->ctx_res_w == RES_MATCH | ||
3819 | ) { | ||
3820 | continue; | ||
3821 | niro | 532 | } |
3822 | niro | 816 | #endif |
3823 | done_pipe(ctx, PIPE_SEQ); | ||
3824 | dest->o_assignment = MAYBE_ASSIGNMENT; | ||
3825 | niro | 532 | } |
3826 | niro | 816 | } |
3827 | if (end_trigger) { | ||
3828 | if (!shadow_quote && strchr(end_trigger, ch)) { | ||
3829 | /* Special case: (...word) makes last word terminate, | ||
3830 | * as if ';' is seen */ | ||
3831 | if (ch == ')') { | ||
3832 | done_word(dest, ctx); | ||
3833 | //err chk? | ||
3834 | done_pipe(ctx, PIPE_SEQ); | ||
3835 | dest->o_assignment = MAYBE_ASSIGNMENT; | ||
3836 | } | ||
3837 | if (!HAS_KEYWORDS | ||
3838 | IF_HAS_KEYWORDS(|| (ctx->ctx_res_w == RES_NONE && ctx->old_flag == 0)) | ||
3839 | ) { | ||
3840 | debug_printf_parse("parse_stream return 0: end_trigger char found\n"); | ||
3841 | return 0; | ||
3842 | } | ||
3843 | niro | 532 | } |
3844 | niro | 816 | } |
3845 | if (m == CHAR_IFS) | ||
3846 | continue; | ||
3847 | |||
3848 | if (dest->o_assignment == MAYBE_ASSIGNMENT) { | ||
3849 | /* ch is a special char and thus this word | ||
3850 | * cannot be an assignment: */ | ||
3851 | dest->o_assignment = NOT_ASSIGNMENT; | ||
3852 | } | ||
3853 | |||
3854 | switch (ch) { | ||
3855 | niro | 532 | case '#': |
3856 | niro | 816 | if (dest->length == 0 && !shadow_quote) { |
3857 | while (1) { | ||
3858 | ch = i_peek(input); | ||
3859 | if (ch == EOF || ch == '\n') | ||
3860 | break; | ||
3861 | i_getch(input); | ||
3862 | } | ||
3863 | niro | 532 | } else { |
3864 | niro | 816 | o_addQchr(dest, ch); |
3865 | niro | 532 | } |
3866 | break; | ||
3867 | case '\\': | ||
3868 | if (next == EOF) { | ||
3869 | niro | 816 | syntax("\\<eof>"); |
3870 | debug_printf_parse("parse_stream return 1: \\<eof>\n"); | ||
3871 | niro | 532 | return 1; |
3872 | } | ||
3873 | niro | 816 | /* bash: |
3874 | * "The backslash retains its special meaning [in "..."] | ||
3875 | * only when followed by one of the following characters: | ||
3876 | * $, `, ", \, or <newline>. A double quote may be quoted | ||
3877 | * within double quotes by preceding it with a backslash. | ||
3878 | * If enabled, history expansion will be performed unless | ||
3879 | * an ! appearing in double quotes is escaped using | ||
3880 | * a backslash. The backslash preceding the ! is not removed." | ||
3881 | */ | ||
3882 | if (shadow_quote) { //NOT SURE dest->o_quote) { | ||
3883 | if (strchr("$`\"\\", next) != NULL) { | ||
3884 | o_addqchr(dest, i_getch(input)); | ||
3885 | } else { | ||
3886 | o_addqchr(dest, '\\'); | ||
3887 | } | ||
3888 | } else { | ||
3889 | o_addchr(dest, '\\'); | ||
3890 | o_addchr(dest, i_getch(input)); | ||
3891 | } | ||
3892 | niro | 532 | break; |
3893 | case '$': | ||
3894 | niro | 816 | if (handle_dollar(dest, input) != 0) { |
3895 | debug_printf_parse("parse_stream return 1: handle_dollar returned non-0\n"); | ||
3896 | return 1; | ||
3897 | } | ||
3898 | niro | 532 | break; |
3899 | case '\'': | ||
3900 | dest->nonnull = 1; | ||
3901 | niro | 816 | while (1) { |
3902 | ch = i_getch(input); | ||
3903 | if (ch == EOF) { | ||
3904 | syntax("unterminated '"); | ||
3905 | debug_printf_parse("parse_stream return 1: unterminated '\n"); | ||
3906 | return 1; | ||
3907 | } | ||
3908 | if (ch == '\'') | ||
3909 | break; | ||
3910 | if (dest->o_assignment == NOT_ASSIGNMENT) | ||
3911 | o_addqchr(dest, ch); | ||
3912 | else | ||
3913 | o_addchr(dest, ch); | ||
3914 | niro | 532 | } |
3915 | break; | ||
3916 | case '"': | ||
3917 | dest->nonnull = 1; | ||
3918 | niro | 816 | shadow_quote ^= 1; /* invert */ |
3919 | if (dest->o_assignment == NOT_ASSIGNMENT) | ||
3920 | dest->o_quote ^= 1; | ||
3921 | niro | 532 | break; |
3922 | niro | 816 | #if ENABLE_HUSH_TICK |
3923 | case '`': { | ||
3924 | //int pos = dest->length; | ||
3925 | o_addchr(dest, SPECIAL_VAR_SYMBOL); | ||
3926 | o_addchr(dest, shadow_quote /*or dest->o_quote??*/ ? 0x80 | '`' : '`'); | ||
3927 | add_till_backquote(dest, input); | ||
3928 | o_addchr(dest, SPECIAL_VAR_SYMBOL); | ||
3929 | //debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos); | ||
3930 | niro | 532 | break; |
3931 | niro | 816 | } |
3932 | #endif | ||
3933 | niro | 532 | case '>': |
3934 | redir_fd = redirect_opt_num(dest); | ||
3935 | done_word(dest, ctx); | ||
3936 | niro | 816 | redir_style = REDIRECT_OVERWRITE; |
3937 | niro | 532 | if (next == '>') { |
3938 | niro | 816 | redir_style = REDIRECT_APPEND; |
3939 | i_getch(input); | ||
3940 | } | ||
3941 | #if 0 | ||
3942 | else if (next == '(') { | ||
3943 | syntax(">(process) not supported"); | ||
3944 | debug_printf_parse("parse_stream return 1: >(process) not supported\n"); | ||
3945 | niro | 532 | return 1; |
3946 | } | ||
3947 | niro | 816 | #endif |
3948 | niro | 532 | setup_redirect(ctx, redir_fd, redir_style, input); |
3949 | break; | ||
3950 | case '<': | ||
3951 | redir_fd = redirect_opt_num(dest); | ||
3952 | done_word(dest, ctx); | ||
3953 | niro | 816 | redir_style = REDIRECT_INPUT; |
3954 | niro | 532 | if (next == '<') { |
3955 | niro | 816 | redir_style = REDIRECT_HEREIS; |
3956 | i_getch(input); | ||
3957 | niro | 532 | } else if (next == '>') { |
3958 | niro | 816 | redir_style = REDIRECT_IO; |
3959 | i_getch(input); | ||
3960 | } | ||
3961 | #if 0 | ||
3962 | else if (next == '(') { | ||
3963 | syntax("<(process) not supported"); | ||
3964 | debug_printf_parse("parse_stream return 1: <(process) not supported\n"); | ||
3965 | niro | 532 | return 1; |
3966 | } | ||
3967 | niro | 816 | #endif |
3968 | niro | 532 | setup_redirect(ctx, redir_fd, redir_style, input); |
3969 | break; | ||
3970 | case ';': | ||
3971 | niro | 816 | #if ENABLE_HUSH_CASE |
3972 | case_semi: | ||
3973 | #endif | ||
3974 | niro | 532 | done_word(dest, ctx); |
3975 | niro | 816 | done_pipe(ctx, PIPE_SEQ); |
3976 | #if ENABLE_HUSH_CASE | ||
3977 | /* Eat multiple semicolons, detect | ||
3978 | * whether it means something special */ | ||
3979 | while (1) { | ||
3980 | ch = i_peek(input); | ||
3981 | if (ch != ';') | ||
3982 | break; | ||
3983 | i_getch(input); | ||
3984 | if (ctx->ctx_res_w == RES_CASEI) { | ||
3985 | ctx->ctx_dsemicolon = 1; | ||
3986 | ctx->ctx_res_w = RES_MATCH; | ||
3987 | break; | ||
3988 | } | ||
3989 | } | ||
3990 | #endif | ||
3991 | new_cmd: | ||
3992 | /* We just finished a cmd. New one may start | ||
3993 | * with an assignment */ | ||
3994 | dest->o_assignment = MAYBE_ASSIGNMENT; | ||
3995 | niro | 532 | break; |
3996 | case '&': | ||
3997 | done_word(dest, ctx); | ||
3998 | niro | 816 | if (next == '&') { |
3999 | i_getch(input); | ||
4000 | done_pipe(ctx, PIPE_AND); | ||
4001 | niro | 532 | } else { |
4002 | niro | 816 | done_pipe(ctx, PIPE_BG); |
4003 | niro | 532 | } |
4004 | niro | 816 | goto new_cmd; |
4005 | niro | 532 | case '|': |
4006 | done_word(dest, ctx); | ||
4007 | niro | 816 | #if ENABLE_HUSH_CASE |
4008 | if (ctx->ctx_res_w == RES_MATCH) | ||
4009 | break; /* we are in case's "word | word)" */ | ||
4010 | #endif | ||
4011 | if (next == '|') { /* || */ | ||
4012 | i_getch(input); | ||
4013 | done_pipe(ctx, PIPE_OR); | ||
4014 | niro | 532 | } else { |
4015 | /* we could pick up a file descriptor choice here | ||
4016 | * with redirect_opt_num(), but bash doesn't do it. | ||
4017 | * "echo foo 2| cat" yields "foo 2". */ | ||
4018 | done_command(ctx); | ||
4019 | } | ||
4020 | niro | 816 | goto new_cmd; |
4021 | niro | 532 | case '(': |
4022 | niro | 816 | #if ENABLE_HUSH_CASE |
4023 | /* "case... in [(]word)..." - skip '(' */ | ||
4024 | if (ctx->ctx_res_w == RES_MATCH | ||
4025 | && ctx->command->argv == NULL /* not (word|(... */ | ||
4026 | && dest->length == 0 /* not word(... */ | ||
4027 | && dest->nonnull == 0 /* not ""(... */ | ||
4028 | ) { | ||
4029 | continue; | ||
4030 | } | ||
4031 | #endif | ||
4032 | #if ENABLE_HUSH_FUNCTIONS | ||
4033 | if (dest->length != 0 /* not just () but word() */ | ||
4034 | && dest->nonnull == 0 /* not a"b"c() */ | ||
4035 | && ctx->command->argv == NULL /* it's the first word */ | ||
4036 | //TODO: "func ( ) {...}" - note spaces - is valid format too in bash | ||
4037 | && i_peek(input) == ')' | ||
4038 | && !match_reserved_word(dest) | ||
4039 | ) { | ||
4040 | bb_error_msg("seems like a function definition"); | ||
4041 | i_getch(input); | ||
4042 | do { | ||
4043 | //TODO: do it properly. | ||
4044 | ch = i_getch(input); | ||
4045 | } while (ch == ' ' || ch == '\n'); | ||
4046 | if (ch != '{') { | ||
4047 | syntax("was expecting {"); | ||
4048 | debug_printf_parse("parse_stream return 1\n"); | ||
4049 | return 1; | ||
4050 | } | ||
4051 | ch = 'F'; /* magic value */ | ||
4052 | } | ||
4053 | #endif | ||
4054 | niro | 532 | case '{': |
4055 | niro | 816 | if (parse_group(dest, ctx, input, ch) != 0) { |
4056 | debug_printf_parse("parse_stream return 1: parse_group returned non-0\n"); | ||
4057 | return 1; | ||
4058 | } | ||
4059 | goto new_cmd; | ||
4060 | niro | 532 | case ')': |
4061 | niro | 816 | #if ENABLE_HUSH_CASE |
4062 | if (ctx->ctx_res_w == RES_MATCH) | ||
4063 | goto case_semi; | ||
4064 | #endif | ||
4065 | niro | 532 | case '}': |
4066 | niro | 816 | /* proper use of this character is caught by end_trigger: |
4067 | * if we see {, we call parse_group(..., end_trigger='}') | ||
4068 | * and it will match } earlier (not here). */ | ||
4069 | syntax("unexpected } or )"); | ||
4070 | debug_printf_parse("parse_stream return 1: unexpected '}'\n"); | ||
4071 | niro | 532 | return 1; |
4072 | default: | ||
4073 | niro | 816 | if (HUSH_DEBUG) |
4074 | bb_error_msg_and_die("BUG: unexpected %c\n", ch); | ||
4075 | niro | 532 | } |
4076 | niro | 816 | } /* while (1) */ |
4077 | debug_printf_parse("parse_stream return %d\n", -(end_trigger != NULL)); | ||
4078 | if (end_trigger) | ||
4079 | return -1; | ||
4080 | niro | 532 | return 0; |
4081 | } | ||
4082 | |||
4083 | niro | 816 | static void set_in_charmap(const char *set, int code) |
4084 | niro | 532 | { |
4085 | niro | 816 | while (*set) |
4086 | G.charmap[(unsigned char)*set++] = code; | ||
4087 | niro | 532 | } |
4088 | |||
4089 | niro | 816 | static void update_charmap(void) |
4090 | niro | 532 | { |
4091 | niro | 816 | G.ifs = getenv("IFS"); |
4092 | if (G.ifs == NULL) | ||
4093 | G.ifs = " \t\n"; | ||
4094 | niro | 532 | /* Precompute a list of 'flow through' behavior so it can be treated |
4095 | * quickly up front. Computation is necessary because of IFS. | ||
4096 | * Special case handling of IFS == " \t\n" is not implemented. | ||
4097 | niro | 816 | * The charmap[] array only really needs two bits each, |
4098 | * and on most machines that would be faster (reduced L1 cache use). | ||
4099 | niro | 532 | */ |
4100 | niro | 816 | memset(G.charmap, CHAR_ORDINARY, sizeof(G.charmap)); |
4101 | #if ENABLE_HUSH_TICK | ||
4102 | set_in_charmap("\\$\"`", CHAR_SPECIAL); | ||
4103 | #else | ||
4104 | set_in_charmap("\\$\"", CHAR_SPECIAL); | ||
4105 | #endif | ||
4106 | set_in_charmap("<>;&|(){}#'", CHAR_ORDINARY_IF_QUOTED); | ||
4107 | set_in_charmap(G.ifs, CHAR_IFS); /* are ordinary if quoted */ | ||
4108 | niro | 532 | } |
4109 | |||
4110 | niro | 816 | /* Most recursion does not come through here, the exception is |
4111 | * from builtin_source() and builtin_eval() */ | ||
4112 | static int parse_and_run_stream(struct in_str *inp, int parse_flag) | ||
4113 | niro | 532 | { |
4114 | niro | 816 | struct parse_context ctx; |
4115 | o_string temp = NULL_O_STRING; | ||
4116 | int rcode; | ||
4117 | niro | 532 | |
4118 | do { | ||
4119 | initialize_context(&ctx); | ||
4120 | niro | 816 | update_charmap(); |
4121 | #if ENABLE_HUSH_INTERACTIVE | ||
4122 | inp->promptmode = 0; /* PS1 */ | ||
4123 | #endif | ||
4124 | /* We will stop & execute after each ';' or '\n'. | ||
4125 | * Example: "sleep 9999; echo TEST" + ctrl-C: | ||
4126 | * TEST should be printed */ | ||
4127 | temp.o_assignment = MAYBE_ASSIGNMENT; | ||
4128 | rcode = parse_stream(&temp, &ctx, inp, ";\n"); | ||
4129 | #if HAS_KEYWORDS | ||
4130 | niro | 532 | if (rcode != 1 && ctx.old_flag != 0) { |
4131 | niro | 816 | syntax(NULL); |
4132 | niro | 532 | } |
4133 | niro | 816 | #endif |
4134 | if (rcode != 1 IF_HAS_KEYWORDS(&& ctx.old_flag == 0)) { | ||
4135 | niro | 532 | done_word(&temp, &ctx); |
4136 | niro | 816 | done_pipe(&ctx, PIPE_SEQ); |
4137 | debug_print_tree(ctx.list_head, 0); | ||
4138 | debug_printf_exec("parse_stream_outer: run_and_free_list\n"); | ||
4139 | run_and_free_list(ctx.list_head); | ||
4140 | niro | 532 | } else { |
4141 | niro | 816 | /* We arrive here also if rcode == 1 (error in parse_stream) */ |
4142 | #if HAS_KEYWORDS | ||
4143 | niro | 532 | if (ctx.old_flag != 0) { |
4144 | free(ctx.stack); | ||
4145 | niro | 816 | o_reset(&temp); |
4146 | niro | 532 | } |
4147 | niro | 816 | #endif |
4148 | /*temp.nonnull = 0; - o_free does it below */ | ||
4149 | /*temp.o_quote = 0; - o_free does it below */ | ||
4150 | free_pipe_list(ctx.list_head, /* indent: */ 0); | ||
4151 | /* Discard all unprocessed line input, force prompt on */ | ||
4152 | niro | 532 | inp->p = NULL; |
4153 | niro | 816 | #if ENABLE_HUSH_INTERACTIVE |
4154 | inp->promptme = 1; | ||
4155 | #endif | ||
4156 | niro | 532 | } |
4157 | niro | 816 | o_free(&temp); |
4158 | /* loop on syntax errors, return on EOF: */ | ||
4159 | } while (rcode != -1 && !(parse_flag & PARSEFLAG_EXIT_FROM_LOOP)); | ||
4160 | niro | 532 | return 0; |
4161 | } | ||
4162 | |||
4163 | niro | 816 | static int parse_and_run_string(const char *s, int parse_flag) |
4164 | niro | 532 | { |
4165 | struct in_str input; | ||
4166 | setup_string_in_str(&input, s); | ||
4167 | niro | 816 | return parse_and_run_stream(&input, parse_flag); |
4168 | niro | 532 | } |
4169 | |||
4170 | niro | 816 | static int parse_and_run_file(FILE *f) |
4171 | niro | 532 | { |
4172 | int rcode; | ||
4173 | struct in_str input; | ||
4174 | setup_file_in_str(&input, f); | ||
4175 | niro | 816 | rcode = parse_and_run_stream(&input, 0 /* parse_flag */); |
4176 | niro | 532 | return rcode; |
4177 | } | ||
4178 | |||
4179 | niro | 816 | #if ENABLE_HUSH_JOB |
4180 | niro | 532 | /* Make sure we have a controlling tty. If we get started under a job |
4181 | * aware app (like bash for example), make sure we are now in charge so | ||
4182 | * we don't fight over who gets the foreground */ | ||
4183 | static void setup_job_control(void) | ||
4184 | { | ||
4185 | niro | 816 | pid_t shell_pgrp; |
4186 | niro | 532 | |
4187 | niro | 816 | shell_pgrp = getpgrp(); |
4188 | close_on_exec_on(G.interactive_fd); | ||
4189 | niro | 532 | |
4190 | niro | 816 | /* If we were ran as 'hush &', |
4191 | * sleep until we are in the foreground. */ | ||
4192 | while (tcgetpgrp(G.interactive_fd) != shell_pgrp) { | ||
4193 | /* Send TTIN to ourself (should stop us) */ | ||
4194 | kill(- shell_pgrp, SIGTTIN); | ||
4195 | shell_pgrp = getpgrp(); | ||
4196 | } | ||
4197 | |||
4198 | /* Ignore job-control and misc signals. */ | ||
4199 | set_jobctrl_sighandler(SIG_IGN); | ||
4200 | set_misc_sighandler(SIG_IGN); | ||
4201 | //huh? signal(SIGCHLD, SIG_IGN); | ||
4202 | |||
4203 | /* We _must_ restore tty pgrp on fatal signals */ | ||
4204 | set_fatal_sighandler(sigexit); | ||
4205 | |||
4206 | niro | 532 | /* Put ourselves in our own process group. */ |
4207 | niro | 816 | bb_setpgrp(); /* is the same as setpgid(our_pid, our_pid); */ |
4208 | niro | 532 | /* Grab control of the terminal. */ |
4209 | niro | 816 | tcsetpgrp(G.interactive_fd, getpid()); |
4210 | niro | 532 | } |
4211 | niro | 816 | #endif |
4212 | niro | 532 | |
4213 | niro | 816 | |
4214 | int hush_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; | ||
4215 | niro | 532 | int hush_main(int argc, char **argv) |
4216 | { | ||
4217 | niro | 816 | static const struct variable const_shell_ver = { |
4218 | .next = NULL, | ||
4219 | .varstr = (char*)hush_version_str, | ||
4220 | .max_len = 1, /* 0 can provoke free(name) */ | ||
4221 | .flg_export = 1, | ||
4222 | .flg_read_only = 1, | ||
4223 | }; | ||
4224 | |||
4225 | niro | 532 | int opt; |
4226 | FILE *input; | ||
4227 | niro | 816 | char **e; |
4228 | struct variable *cur_var; | ||
4229 | niro | 532 | |
4230 | niro | 816 | INIT_G(); |
4231 | niro | 532 | |
4232 | niro | 816 | G.root_pid = getpid(); |
4233 | niro | 532 | |
4234 | niro | 816 | /* Deal with HUSH_VERSION */ |
4235 | G.shell_ver = const_shell_ver; /* copying struct here */ | ||
4236 | G.top_var = &G.shell_ver; | ||
4237 | debug_printf_env("unsetenv '%s'\n", "HUSH_VERSION"); | ||
4238 | unsetenv("HUSH_VERSION"); /* in case it exists in initial env */ | ||
4239 | /* Initialize our shell local variables with the values | ||
4240 | niro | 532 | * currently living in the environment */ |
4241 | niro | 816 | cur_var = G.top_var; |
4242 | e = environ; | ||
4243 | if (e) while (*e) { | ||
4244 | char *value = strchr(*e, '='); | ||
4245 | if (value) { /* paranoia */ | ||
4246 | cur_var->next = xzalloc(sizeof(*cur_var)); | ||
4247 | cur_var = cur_var->next; | ||
4248 | cur_var->varstr = *e; | ||
4249 | cur_var->max_len = strlen(*e); | ||
4250 | cur_var->flg_export = 1; | ||
4251 | } | ||
4252 | e++; | ||
4253 | niro | 532 | } |
4254 | niro | 816 | debug_printf_env("putenv '%s'\n", hush_version_str); |
4255 | putenv((char *)hush_version_str); /* reinstate HUSH_VERSION */ | ||
4256 | niro | 532 | |
4257 | niro | 816 | #if ENABLE_FEATURE_EDITING |
4258 | G.line_input_state = new_line_input_t(FOR_SHELL); | ||
4259 | #endif | ||
4260 | /* XXX what should these be while sourcing /etc/profile? */ | ||
4261 | G.global_argc = argc; | ||
4262 | G.global_argv = argv; | ||
4263 | /* Initialize some more globals to non-zero values */ | ||
4264 | set_cwd(); | ||
4265 | #if ENABLE_HUSH_INTERACTIVE | ||
4266 | #if ENABLE_FEATURE_EDITING | ||
4267 | cmdedit_set_initial_prompt(); | ||
4268 | #endif | ||
4269 | G.PS2 = "> "; | ||
4270 | #endif | ||
4271 | niro | 532 | |
4272 | niro | 816 | if (EXIT_SUCCESS) /* otherwise is already done */ |
4273 | G.last_return_code = EXIT_SUCCESS; | ||
4274 | niro | 532 | |
4275 | if (argv[0] && argv[0][0] == '-') { | ||
4276 | niro | 816 | debug_printf("sourcing /etc/profile\n"); |
4277 | input = fopen_for_read("/etc/profile"); | ||
4278 | if (input != NULL) { | ||
4279 | close_on_exec_on(fileno(input)); | ||
4280 | parse_and_run_file(input); | ||
4281 | niro | 532 | fclose(input); |
4282 | } | ||
4283 | } | ||
4284 | niro | 816 | input = stdin; |
4285 | niro | 532 | |
4286 | while ((opt = getopt(argc, argv, "c:xif")) > 0) { | ||
4287 | switch (opt) { | ||
4288 | niro | 816 | case 'c': |
4289 | G.global_argv = argv + optind; | ||
4290 | if (!argv[optind]) { | ||
4291 | /* -c 'script' (no params): prevent empty $0 */ | ||
4292 | *--G.global_argv = argv[0]; | ||
4293 | optind--; | ||
4294 | } /* else -c 'script' PAR0 PAR1: $0 is PAR0 */ | ||
4295 | G.global_argc = argc - optind; | ||
4296 | opt = parse_and_run_string(optarg, 0 /* parse_flag */); | ||
4297 | goto final_return; | ||
4298 | case 'i': | ||
4299 | /* Well, we cannot just declare interactiveness, | ||
4300 | * we have to have some stuff (ctty, etc) */ | ||
4301 | /* G.interactive_fd++; */ | ||
4302 | break; | ||
4303 | case 'f': | ||
4304 | G.fake_mode = 1; | ||
4305 | break; | ||
4306 | default: | ||
4307 | niro | 532 | #ifndef BB_VER |
4308 | niro | 816 | fprintf(stderr, "Usage: sh [FILE]...\n" |
4309 | " or: sh -c command [args]...\n\n"); | ||
4310 | exit(EXIT_FAILURE); | ||
4311 | niro | 532 | #else |
4312 | niro | 816 | bb_show_usage(); |
4313 | niro | 532 | #endif |
4314 | } | ||
4315 | } | ||
4316 | niro | 816 | #if ENABLE_HUSH_JOB |
4317 | /* A shell is interactive if the '-i' flag was given, or if all of | ||
4318 | niro | 532 | * the following conditions are met: |
4319 | niro | 816 | * no -c command |
4320 | niro | 532 | * no arguments remaining or the -s flag given |
4321 | * standard input is a terminal | ||
4322 | * standard output is a terminal | ||
4323 | niro | 816 | * Refer to Posix.2, the description of the 'sh' utility. */ |
4324 | if (argv[optind] == NULL && input == stdin | ||
4325 | && isatty(STDIN_FILENO) && isatty(STDOUT_FILENO) | ||
4326 | ) { | ||
4327 | G.saved_tty_pgrp = tcgetpgrp(STDIN_FILENO); | ||
4328 | debug_printf("saved_tty_pgrp=%d\n", G.saved_tty_pgrp); | ||
4329 | if (G.saved_tty_pgrp >= 0) { | ||
4330 | /* try to dup to high fd#, >= 255 */ | ||
4331 | G.interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255); | ||
4332 | if (G.interactive_fd < 0) { | ||
4333 | /* try to dup to any fd */ | ||
4334 | G.interactive_fd = dup(STDIN_FILENO); | ||
4335 | if (G.interactive_fd < 0) | ||
4336 | /* give up */ | ||
4337 | G.interactive_fd = 0; | ||
4338 | } | ||
4339 | // TODO: track & disallow any attempts of user | ||
4340 | // to (inadvertently) close/redirect it | ||
4341 | } | ||
4342 | niro | 532 | } |
4343 | niro | 816 | debug_printf("G.interactive_fd=%d\n", G.interactive_fd); |
4344 | if (G.interactive_fd) { | ||
4345 | fcntl(G.interactive_fd, F_SETFD, FD_CLOEXEC); | ||
4346 | niro | 532 | /* Looks like they want an interactive shell */ |
4347 | niro | 816 | setup_job_control(); |
4348 | /* -1 is special - makes xfuncs longjmp, not exit | ||
4349 | * (we reset die_sleep = 0 whereever we [v]fork) */ | ||
4350 | die_sleep = -1; | ||
4351 | if (setjmp(die_jmp)) { | ||
4352 | /* xfunc has failed! die die die */ | ||
4353 | hush_exit(xfunc_error_retval); | ||
4354 | } | ||
4355 | #if !ENABLE_FEATURE_SH_EXTRA_QUIET | ||
4356 | printf("\n\n%s hush - the humble shell v"HUSH_VER_STR"\n", bb_banner); | ||
4357 | printf("Enter 'help' for a list of built-in commands.\n\n"); | ||
4358 | niro | 532 | #endif |
4359 | } | ||
4360 | niro | 816 | #elif ENABLE_HUSH_INTERACTIVE |
4361 | /* no job control compiled, only prompt/line editing */ | ||
4362 | if (argv[optind] == NULL && input == stdin | ||
4363 | && isatty(STDIN_FILENO) && isatty(STDOUT_FILENO) | ||
4364 | ) { | ||
4365 | G.interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255); | ||
4366 | if (G.interactive_fd < 0) { | ||
4367 | /* try to dup to any fd */ | ||
4368 | G.interactive_fd = dup(STDIN_FILENO); | ||
4369 | if (G.interactive_fd < 0) | ||
4370 | /* give up */ | ||
4371 | G.interactive_fd = 0; | ||
4372 | } | ||
4373 | if (G.interactive_fd) { | ||
4374 | fcntl(G.interactive_fd, F_SETFD, FD_CLOEXEC); | ||
4375 | set_misc_sighandler(SIG_IGN); | ||
4376 | } | ||
4377 | } | ||
4378 | #endif | ||
4379 | niro | 532 | |
4380 | niro | 816 | if (argv[optind] == NULL) { |
4381 | opt = parse_and_run_file(stdin); | ||
4382 | } else { | ||
4383 | debug_printf("\nrunning script '%s'\n", argv[optind]); | ||
4384 | G.global_argv = argv + optind; | ||
4385 | G.global_argc = argc - optind; | ||
4386 | input = xfopen_for_read(argv[optind]); | ||
4387 | fcntl(fileno(input), F_SETFD, FD_CLOEXEC); | ||
4388 | opt = parse_and_run_file(input); | ||
4389 | niro | 532 | } |
4390 | |||
4391 | niro | 816 | final_return: |
4392 | niro | 532 | |
4393 | niro | 816 | #if ENABLE_FEATURE_CLEAN_UP |
4394 | niro | 532 | fclose(input); |
4395 | niro | 816 | if (G.cwd != bb_msg_unknown) |
4396 | free((char*)G.cwd); | ||
4397 | cur_var = G.top_var->next; | ||
4398 | while (cur_var) { | ||
4399 | struct variable *tmp = cur_var; | ||
4400 | if (!cur_var->max_len) | ||
4401 | free(cur_var->varstr); | ||
4402 | cur_var = cur_var->next; | ||
4403 | free(tmp); | ||
4404 | } | ||
4405 | #endif | ||
4406 | hush_exit(opt ? opt : G.last_return_code); | ||
4407 | } | ||
4408 | |||
4409 | |||
4410 | #if ENABLE_LASH | ||
4411 | int lash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; | ||
4412 | int lash_main(int argc, char **argv) | ||
4413 | { | ||
4414 | //bb_error_msg("lash is deprecated, please use hush instead"); | ||
4415 | return hush_main(argc, argv); | ||
4416 | } | ||
4417 | #endif | ||
4418 | |||
4419 | |||
4420 | /* | ||
4421 | * Built-ins | ||
4422 | */ | ||
4423 | static int builtin_true(char **argv UNUSED_PARAM) | ||
4424 | { | ||
4425 | return 0; | ||
4426 | } | ||
4427 | |||
4428 | static int builtin_test(char **argv) | ||
4429 | { | ||
4430 | int argc = 0; | ||
4431 | while (*argv) { | ||
4432 | argc++; | ||
4433 | argv++; | ||
4434 | } | ||
4435 | return test_main(argc, argv - argc); | ||
4436 | } | ||
4437 | |||
4438 | static int builtin_echo(char **argv) | ||
4439 | { | ||
4440 | int argc = 0; | ||
4441 | while (*argv) { | ||
4442 | argc++; | ||
4443 | argv++; | ||
4444 | } | ||
4445 | return echo_main(argc, argv - argc); | ||
4446 | } | ||
4447 | |||
4448 | static int builtin_eval(char **argv) | ||
4449 | { | ||
4450 | int rcode = EXIT_SUCCESS; | ||
4451 | |||
4452 | if (argv[1]) { | ||
4453 | char *str = expand_strvec_to_string(argv + 1); | ||
4454 | parse_and_run_string(str, PARSEFLAG_EXIT_FROM_LOOP); | ||
4455 | free(str); | ||
4456 | rcode = G.last_return_code; | ||
4457 | } | ||
4458 | return rcode; | ||
4459 | } | ||
4460 | |||
4461 | static int builtin_cd(char **argv) | ||
4462 | { | ||
4463 | const char *newdir; | ||
4464 | if (argv[1] == NULL) { | ||
4465 | // bash does nothing (exitcode 0) if HOME is ""; if it's unset, | ||
4466 | // bash says "bash: cd: HOME not set" and does nothing (exitcode 1) | ||
4467 | newdir = getenv("HOME") ? : "/"; | ||
4468 | } else | ||
4469 | newdir = argv[1]; | ||
4470 | if (chdir(newdir)) { | ||
4471 | printf("cd: %s: %s\n", newdir, strerror(errno)); | ||
4472 | return EXIT_FAILURE; | ||
4473 | } | ||
4474 | set_cwd(); | ||
4475 | return EXIT_SUCCESS; | ||
4476 | } | ||
4477 | |||
4478 | static int builtin_exec(char **argv) | ||
4479 | { | ||
4480 | if (argv[1] == NULL) | ||
4481 | return EXIT_SUCCESS; /* bash does this */ | ||
4482 | niro | 532 | { |
4483 | niro | 816 | #if !BB_MMU |
4484 | nommu_save_t dummy; | ||
4485 | #endif | ||
4486 | // FIXME: if exec fails, bash does NOT exit! We do... | ||
4487 | pseudo_exec_argv(&dummy, argv + 1, 0, NULL); | ||
4488 | /* never returns */ | ||
4489 | } | ||
4490 | } | ||
4491 | |||
4492 | static int builtin_exit(char **argv) | ||
4493 | { | ||
4494 | // TODO: bash does it ONLY on top-level sh exit (+interacive only?) | ||
4495 | //puts("exit"); /* bash does it */ | ||
4496 | // TODO: warn if we have background jobs: "There are stopped jobs" | ||
4497 | // On second consecutive 'exit', exit anyway. | ||
4498 | if (argv[1] == NULL) | ||
4499 | hush_exit(G.last_return_code); | ||
4500 | /* mimic bash: exit 123abc == exit 255 + error msg */ | ||
4501 | xfunc_error_retval = 255; | ||
4502 | /* bash: exit -2 == exit 254, no error msg */ | ||
4503 | hush_exit(xatoi(argv[1]) & 0xff); | ||
4504 | } | ||
4505 | |||
4506 | static int builtin_export(char **argv) | ||
4507 | { | ||
4508 | const char *value; | ||
4509 | char *name = argv[1]; | ||
4510 | |||
4511 | if (name == NULL) { | ||
4512 | // TODO: | ||
4513 | // ash emits: export VAR='VAL' | ||
4514 | // bash: declare -x VAR="VAL" | ||
4515 | // (both also escape as needed (quotes, $, etc)) | ||
4516 | char **e = environ; | ||
4517 | if (e) | ||
4518 | while (*e) | ||
4519 | puts(*e++); | ||
4520 | return EXIT_SUCCESS; | ||
4521 | } | ||
4522 | |||
4523 | value = strchr(name, '='); | ||
4524 | if (!value) { | ||
4525 | /* They are exporting something without a =VALUE */ | ||
4526 | struct variable *var; | ||
4527 | |||
4528 | var = get_local_var(name); | ||
4529 | if (var) { | ||
4530 | var->flg_export = 1; | ||
4531 | debug_printf_env("%s: putenv '%s'\n", __func__, var->varstr); | ||
4532 | putenv(var->varstr); | ||
4533 | niro | 532 | } |
4534 | niro | 816 | /* bash does not return an error when trying to export |
4535 | * an undefined variable. Do likewise. */ | ||
4536 | return EXIT_SUCCESS; | ||
4537 | niro | 532 | } |
4538 | |||
4539 | niro | 816 | set_local_var(xstrdup(name), 1); |
4540 | return EXIT_SUCCESS; | ||
4541 | niro | 532 | } |
4542 | |||
4543 | niro | 816 | #if ENABLE_HUSH_JOB |
4544 | /* built-in 'fg' and 'bg' handler */ | ||
4545 | static int builtin_fg_bg(char **argv) | ||
4546 | niro | 532 | { |
4547 | niro | 816 | int i, jobnum; |
4548 | struct pipe *pi; | ||
4549 | niro | 532 | |
4550 | niro | 816 | if (!G.interactive_fd) |
4551 | return EXIT_FAILURE; | ||
4552 | /* If they gave us no args, assume they want the last backgrounded task */ | ||
4553 | if (!argv[1]) { | ||
4554 | for (pi = G.job_list; pi; pi = pi->next) { | ||
4555 | if (pi->jobid == G.last_jobid) { | ||
4556 | goto found; | ||
4557 | } | ||
4558 | niro | 532 | } |
4559 | niro | 816 | bb_error_msg("%s: no current job", argv[0]); |
4560 | return EXIT_FAILURE; | ||
4561 | } | ||
4562 | if (sscanf(argv[1], "%%%d", &jobnum) != 1) { | ||
4563 | bb_error_msg("%s: bad argument '%s'", argv[0], argv[1]); | ||
4564 | return EXIT_FAILURE; | ||
4565 | } | ||
4566 | for (pi = G.job_list; pi; pi = pi->next) { | ||
4567 | if (pi->jobid == jobnum) { | ||
4568 | goto found; | ||
4569 | niro | 532 | } |
4570 | } | ||
4571 | niro | 816 | bb_error_msg("%s: %d: no such job", argv[0], jobnum); |
4572 | return EXIT_FAILURE; | ||
4573 | found: | ||
4574 | // TODO: bash prints a string representation | ||
4575 | // of job being foregrounded (like "sleep 1 | cat") | ||
4576 | if (*argv[0] == 'f') { | ||
4577 | /* Put the job into the foreground. */ | ||
4578 | tcsetpgrp(G.interactive_fd, pi->pgrp); | ||
4579 | } | ||
4580 | |||
4581 | /* Restart the processes in the job */ | ||
4582 | debug_printf_jobs("reviving %d procs, pgrp %d\n", pi->num_cmds, pi->pgrp); | ||
4583 | for (i = 0; i < pi->num_cmds; i++) { | ||
4584 | debug_printf_jobs("reviving pid %d\n", pi->cmds[i].pid); | ||
4585 | pi->cmds[i].is_stopped = 0; | ||
4586 | } | ||
4587 | pi->stopped_cmds = 0; | ||
4588 | |||
4589 | i = kill(- pi->pgrp, SIGCONT); | ||
4590 | if (i < 0) { | ||
4591 | if (errno == ESRCH) { | ||
4592 | delete_finished_bg_job(pi); | ||
4593 | return EXIT_SUCCESS; | ||
4594 | } else { | ||
4595 | bb_perror_msg("kill (SIGCONT)"); | ||
4596 | niro | 532 | } |
4597 | } | ||
4598 | niro | 816 | |
4599 | if (*argv[0] == 'f') { | ||
4600 | remove_bg_job(pi); | ||
4601 | return checkjobs_and_fg_shell(pi); | ||
4602 | } | ||
4603 | return EXIT_SUCCESS; | ||
4604 | niro | 532 | } |
4605 | niro | 816 | #endif |
4606 | niro | 532 | |
4607 | niro | 816 | #if ENABLE_HUSH_HELP |
4608 | static int builtin_help(char **argv UNUSED_PARAM) | ||
4609 | niro | 532 | { |
4610 | niro | 816 | const struct built_in_command *x; |
4611 | niro | 532 | |
4612 | niro | 816 | printf("\nBuilt-in commands:\n"); |
4613 | printf("-------------------\n"); | ||
4614 | for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) { | ||
4615 | printf("%s\t%s\n", x->cmd, x->descr); | ||
4616 | } | ||
4617 | printf("\n\n"); | ||
4618 | return EXIT_SUCCESS; | ||
4619 | } | ||
4620 | #endif | ||
4621 | |||
4622 | #if ENABLE_HUSH_JOB | ||
4623 | static int builtin_jobs(char **argv UNUSED_PARAM) | ||
4624 | { | ||
4625 | struct pipe *job; | ||
4626 | const char *status_string; | ||
4627 | |||
4628 | for (job = G.job_list; job; job = job->next) { | ||
4629 | if (job->alive_cmds == job->stopped_cmds) | ||
4630 | status_string = "Stopped"; | ||
4631 | else | ||
4632 | status_string = "Running"; | ||
4633 | |||
4634 | printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->cmdtext); | ||
4635 | } | ||
4636 | return EXIT_SUCCESS; | ||
4637 | } | ||
4638 | #endif | ||
4639 | |||
4640 | static int builtin_pwd(char **argv UNUSED_PARAM) | ||
4641 | { | ||
4642 | puts(set_cwd()); | ||
4643 | return EXIT_SUCCESS; | ||
4644 | } | ||
4645 | |||
4646 | static int builtin_read(char **argv) | ||
4647 | { | ||
4648 | char *string; | ||
4649 | const char *name = argv[1] ? argv[1] : "REPLY"; | ||
4650 | |||
4651 | string = xmalloc_reads(STDIN_FILENO, xasprintf("%s=", name), NULL); | ||
4652 | return set_local_var(string, 0); | ||
4653 | } | ||
4654 | |||
4655 | /* built-in 'set' handler | ||
4656 | * SUSv3 says: | ||
4657 | * set [-abCefmnuvx] [-h] [-o option] [argument...] | ||
4658 | * set [+abCefmnuvx] [+h] [+o option] [argument...] | ||
4659 | * set -- [argument...] | ||
4660 | * set -o | ||
4661 | * set +o | ||
4662 | * Implementations shall support the options in both their hyphen and | ||
4663 | * plus-sign forms. These options can also be specified as options to sh. | ||
4664 | * Examples: | ||
4665 | * Write out all variables and their values: set | ||
4666 | * Set $1, $2, and $3 and set "$#" to 3: set c a b | ||
4667 | * Turn on the -x and -v options: set -xv | ||
4668 | * Unset all positional parameters: set -- | ||
4669 | * Set $1 to the value of x, even if it begins with '-' or '+': set -- "$x" | ||
4670 | * Set the positional parameters to the expansion of x, even if x expands | ||
4671 | * with a leading '-' or '+': set -- $x | ||
4672 | * | ||
4673 | * So far, we only support "set -- [argument...]" by ignoring all options | ||
4674 | * (also, "-o option" will be mishandled by taking "option" as parameter #1). | ||
4675 | */ | ||
4676 | static int builtin_set(char **argv) | ||
4677 | { | ||
4678 | struct variable *e; | ||
4679 | char **pp; | ||
4680 | char *arg = *++argv; | ||
4681 | |||
4682 | if (arg == NULL) { | ||
4683 | for (e = G.top_var; e; e = e->next) | ||
4684 | puts(e->varstr); | ||
4685 | } else { | ||
4686 | /* NB: G.global_argv[0] ($0) is never freed/changed */ | ||
4687 | |||
4688 | if (G.global_args_malloced) { | ||
4689 | pp = G.global_argv; | ||
4690 | while (*++pp) | ||
4691 | free(*pp); | ||
4692 | G.global_argv[1] = NULL; | ||
4693 | } else { | ||
4694 | G.global_args_malloced = 1; | ||
4695 | pp = xzalloc(sizeof(pp[0]) * 2); | ||
4696 | pp[0] = G.global_argv[0]; /* retain $0 */ | ||
4697 | G.global_argv = pp; | ||
4698 | } | ||
4699 | do { | ||
4700 | if (arg[0] == '+') | ||
4701 | niro | 532 | continue; |
4702 | niro | 816 | if (arg[0] != '-') |
4703 | break; | ||
4704 | if (arg[1] == '-' && arg[2] == '\0') { | ||
4705 | argv++; | ||
4706 | break; | ||
4707 | niro | 532 | } |
4708 | niro | 816 | } while ((arg = *++argv) != NULL); |
4709 | /* Now argv[0] is 1st argument */ | ||
4710 | |||
4711 | /* This realloc's G.global_argv */ | ||
4712 | G.global_argv = pp = add_strings_to_strings(G.global_argv, argv, /*dup:*/ 1); | ||
4713 | G.global_argc = 1; | ||
4714 | while (*++pp) | ||
4715 | G.global_argc++; | ||
4716 | } | ||
4717 | |||
4718 | return EXIT_SUCCESS; | ||
4719 | } | ||
4720 | |||
4721 | static int builtin_shift(char **argv) | ||
4722 | { | ||
4723 | int n = 1; | ||
4724 | if (argv[1]) { | ||
4725 | n = atoi(argv[1]); | ||
4726 | } | ||
4727 | if (n >= 0 && n < G.global_argc) { | ||
4728 | if (G.global_args_malloced) { | ||
4729 | int m = 1; | ||
4730 | while (m <= n) | ||
4731 | free(G.global_argv[m++]); | ||
4732 | niro | 532 | } |
4733 | niro | 816 | G.global_argc -= n; |
4734 | memmove(&G.global_argv[1], &G.global_argv[n+1], | ||
4735 | G.global_argc * sizeof(G.global_argv[0])); | ||
4736 | return EXIT_SUCCESS; | ||
4737 | niro | 532 | } |
4738 | niro | 816 | return EXIT_FAILURE; |
4739 | niro | 532 | } |
4740 | |||
4741 | niro | 816 | static int builtin_source(char **argv) |
4742 | niro | 532 | { |
4743 | niro | 816 | FILE *input; |
4744 | int status; | ||
4745 | niro | 532 | |
4746 | niro | 816 | if (argv[1] == NULL) |
4747 | return EXIT_FAILURE; | ||
4748 | |||
4749 | /* XXX search through $PATH is missing */ | ||
4750 | input = fopen_for_read(argv[1]); | ||
4751 | if (!input) { | ||
4752 | bb_error_msg("can't open '%s'", argv[1]); | ||
4753 | return EXIT_FAILURE; | ||
4754 | } | ||
4755 | close_on_exec_on(fileno(input)); | ||
4756 | |||
4757 | /* Now run the file */ | ||
4758 | /* XXX argv and argc are broken; need to save old G.global_argv | ||
4759 | * (pointer only is OK!) on this stack frame, | ||
4760 | * set G.global_argv=argv+1, recurse, and restore. */ | ||
4761 | status = parse_and_run_file(input); | ||
4762 | fclose(input); | ||
4763 | return status; | ||
4764 | } | ||
4765 | |||
4766 | static int builtin_umask(char **argv) | ||
4767 | { | ||
4768 | mode_t new_umask; | ||
4769 | const char *arg = argv[1]; | ||
4770 | char *end; | ||
4771 | if (arg) { | ||
4772 | new_umask = strtoul(arg, &end, 8); | ||
4773 | if (*end != '\0' || end == arg) { | ||
4774 | return EXIT_FAILURE; | ||
4775 | niro | 532 | } |
4776 | niro | 816 | } else { |
4777 | new_umask = umask(0); | ||
4778 | printf("%.3o\n", (unsigned) new_umask); | ||
4779 | niro | 532 | } |
4780 | niro | 816 | umask(new_umask); |
4781 | return EXIT_SUCCESS; | ||
4782 | niro | 532 | } |
4783 | niro | 816 | |
4784 | static int builtin_unset(char **argv) | ||
4785 | { | ||
4786 | /* bash always returns true */ | ||
4787 | unset_local_var(argv[1]); | ||
4788 | return EXIT_SUCCESS; | ||
4789 | } | ||
4790 | |||
4791 | #if ENABLE_HUSH_LOOPS | ||
4792 | static int builtin_break(char **argv) | ||
4793 | { | ||
4794 | if (G.depth_of_loop == 0) { | ||
4795 | bb_error_msg("%s: only meaningful in a loop", argv[0]); | ||
4796 | return EXIT_SUCCESS; /* bash compat */ | ||
4797 | } | ||
4798 | G.flag_break_continue++; /* BC_BREAK = 1 */ | ||
4799 | G.depth_break_continue = 1; | ||
4800 | if (argv[1]) { | ||
4801 | G.depth_break_continue = bb_strtou(argv[1], NULL, 10); | ||
4802 | if (errno || !G.depth_break_continue || argv[2]) { | ||
4803 | bb_error_msg("%s: bad arguments", argv[0]); | ||
4804 | G.flag_break_continue = BC_BREAK; | ||
4805 | G.depth_break_continue = UINT_MAX; | ||
4806 | } | ||
4807 | } | ||
4808 | if (G.depth_of_loop < G.depth_break_continue) | ||
4809 | G.depth_break_continue = G.depth_of_loop; | ||
4810 | return EXIT_SUCCESS; | ||
4811 | } | ||
4812 | |||
4813 | static int builtin_continue(char **argv) | ||
4814 | { | ||
4815 | G.flag_break_continue = 1; /* BC_CONTINUE = 2 = 1+1 */ | ||
4816 | return builtin_break(argv); | ||
4817 | } | ||
4818 | #endif |