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Commit | Line | Data |
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8f2ece69 | 1 | /* POSIX.2 wordexp implementation. |
bfff8b1b | 2 | Copyright (C) 1997-2017 Free Software Foundation, Inc. |
c84142e8 | 3 | This file is part of the GNU C Library. |
8f2ece69 | 4 | Contributed by Tim Waugh <tim@cyberelk.demon.co.uk>. |
28f540f4 | 5 | |
c84142e8 | 6 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
28f540f4 | 10 | |
c84142e8 UD |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
28f540f4 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 19 | |
f1c30c98 | 20 | #include <alloca.h> |
51028f34 UD |
21 | #include <ctype.h> |
22 | #include <errno.h> | |
23 | #include <fcntl.h> | |
24 | #include <fnmatch.h> | |
25 | #include <glob.h> | |
26 | #include <libintl.h> | |
27 | #include <paths.h> | |
28 | #include <pwd.h> | |
28f540f4 | 29 | #include <signal.h> |
bea9b193 | 30 | #include <stdbool.h> |
51028f34 | 31 | #include <stdio.h> |
8f2ece69 | 32 | #include <stdlib.h> |
8f2ece69 | 33 | #include <string.h> |
51028f34 UD |
34 | #include <sys/param.h> |
35 | #include <sys/stat.h> | |
8f2ece69 UD |
36 | #include <sys/time.h> |
37 | #include <sys/types.h> | |
51028f34 | 38 | #include <sys/types.h> |
8f2ece69 UD |
39 | #include <sys/wait.h> |
40 | #include <unistd.h> | |
3ce1f295 | 41 | #include <wchar.h> |
51028f34 | 42 | #include <wordexp.h> |
e038616f | 43 | #include <kernel-features.h> |
28f540f4 | 44 | |
ec999b8e | 45 | #include <libc-lock.h> |
eb96ffb0 | 46 | #include <_itoa.h> |
86187531 | 47 | |
af6f3906 UD |
48 | /* Undefine the following line for the production version. */ |
49 | /* #define NDEBUG 1 */ | |
8f2ece69 | 50 | #include <assert.h> |
28f540f4 | 51 | |
316ca440 UD |
52 | /* Get some device information. */ |
53 | #include <device-nrs.h> | |
54 | ||
8f2ece69 UD |
55 | /* |
56 | * This is a recursive-descent-style word expansion routine. | |
57 | */ | |
58 | ||
14c44e2e | 59 | /* These variables are defined and initialized in the startup code. */ |
100351c3 UD |
60 | extern int __libc_argc attribute_hidden; |
61 | extern char **__libc_argv attribute_hidden; | |
2bcf29ba | 62 | |
8f2ece69 | 63 | /* Some forward declarations */ |
40a55d20 UD |
64 | static int parse_dollars (char **word, size_t *word_length, size_t *max_length, |
65 | const char *words, size_t *offset, int flags, | |
af69217f | 66 | wordexp_t *pwordexp, const char *ifs, |
9b3c7c3c | 67 | const char *ifs_white, int quoted) |
dfd2257a | 68 | internal_function; |
40a55d20 UD |
69 | static int parse_backtick (char **word, size_t *word_length, |
70 | size_t *max_length, const char *words, | |
af69217f UD |
71 | size_t *offset, int flags, wordexp_t *pwordexp, |
72 | const char *ifs, const char *ifs_white) | |
dfd2257a | 73 | internal_function; |
22bc7978 UD |
74 | static int parse_dquote (char **word, size_t *word_length, size_t *max_length, |
75 | const char *words, size_t *offset, int flags, | |
76 | wordexp_t *pwordexp, const char *ifs, | |
77 | const char *ifs_white) | |
78 | internal_function; | |
3db52d94 | 79 | static int eval_expr (char *expr, long int *result) internal_function; |
8f2ece69 | 80 | |
55c14926 | 81 | /* The w_*() functions manipulate word lists. */ |
8f2ece69 | 82 | |
40a55d20 UD |
83 | #define W_CHUNK (100) |
84 | ||
bac660f8 | 85 | /* Result of w_newword will be ignored if it's the last word. */ |
e9fc7bbb UD |
86 | static inline char * |
87 | w_newword (size_t *actlen, size_t *maxlen) | |
88 | { | |
89 | *actlen = *maxlen = 0; | |
90 | return NULL; | |
91 | } | |
92 | ||
9c7ff11a | 93 | static char * |
40a55d20 UD |
94 | w_addchar (char *buffer, size_t *actlen, size_t *maxlen, char ch) |
95 | /* (lengths exclude trailing zero) */ | |
8f2ece69 | 96 | { |
9c7ff11a | 97 | /* Add a character to the buffer, allocating room for it if needed. */ |
28f540f4 | 98 | |
40a55d20 | 99 | if (*actlen == *maxlen) |
8f2ece69 | 100 | { |
40a55d20 UD |
101 | char *old_buffer = buffer; |
102 | assert (buffer == NULL || *maxlen != 0); | |
103 | *maxlen += W_CHUNK; | |
9c7ff11a | 104 | buffer = (char *) realloc (buffer, 1 + *maxlen); |
40a55d20 UD |
105 | |
106 | if (buffer == NULL) | |
107 | free (old_buffer); | |
108 | } | |
28f540f4 | 109 | |
40a55d20 UD |
110 | if (buffer != NULL) |
111 | { | |
112 | buffer[*actlen] = ch; | |
113 | buffer[++(*actlen)] = '\0'; | |
8f2ece69 | 114 | } |
40a55d20 UD |
115 | |
116 | return buffer; | |
8f2ece69 UD |
117 | } |
118 | ||
40a55d20 | 119 | static char * |
3db52d94 UD |
120 | internal_function |
121 | w_addmem (char *buffer, size_t *actlen, size_t *maxlen, const char *str, | |
122 | size_t len) | |
8f2ece69 | 123 | { |
40a55d20 | 124 | /* Add a string to the buffer, allocating room for it if needed. |
8f2ece69 | 125 | */ |
40a55d20 | 126 | if (*actlen + len > *maxlen) |
8f2ece69 | 127 | { |
40a55d20 UD |
128 | char *old_buffer = buffer; |
129 | assert (buffer == NULL || *maxlen != 0); | |
130 | *maxlen += MAX (2 * len, W_CHUNK); | |
131 | buffer = realloc (old_buffer, 1 + *maxlen); | |
132 | ||
133 | if (buffer == NULL) | |
134 | free (old_buffer); | |
8f2ece69 | 135 | } |
8f2ece69 | 136 | |
40a55d20 UD |
137 | if (buffer != NULL) |
138 | { | |
86187531 | 139 | *((char *) __mempcpy (&buffer[*actlen], str, len)) = '\0'; |
40a55d20 | 140 | *actlen += len; |
40a55d20 | 141 | } |
8f2ece69 | 142 | |
40a55d20 | 143 | return buffer; |
8f2ece69 UD |
144 | } |
145 | ||
3db52d94 UD |
146 | static char * |
147 | internal_function | |
148 | w_addstr (char *buffer, size_t *actlen, size_t *maxlen, const char *str) | |
149 | /* (lengths exclude trailing zero) */ | |
150 | { | |
151 | /* Add a string to the buffer, allocating room for it if needed. | |
152 | */ | |
153 | size_t len; | |
154 | ||
155 | assert (str != NULL); /* w_addstr only called from this file */ | |
156 | len = strlen (str); | |
157 | ||
158 | return w_addmem (buffer, actlen, maxlen, str, len); | |
159 | } | |
160 | ||
8f2ece69 | 161 | static int |
3db52d94 | 162 | internal_function |
8f2ece69 UD |
163 | w_addword (wordexp_t *pwordexp, char *word) |
164 | { | |
165 | /* Add a word to the wordlist */ | |
166 | size_t num_p; | |
22bc7978 | 167 | char **new_wordv; |
e7c8359e | 168 | bool allocated = false; |
8f2ece69 | 169 | |
c06cc21c UD |
170 | /* Internally, NULL acts like "". Convert NULLs to "" before |
171 | * the caller sees them. | |
172 | */ | |
173 | if (word == NULL) | |
174 | { | |
175 | word = __strdup (""); | |
176 | if (word == NULL) | |
177 | goto no_space; | |
e7c8359e | 178 | allocated = true; |
c06cc21c UD |
179 | } |
180 | ||
8f2ece69 | 181 | num_p = 2 + pwordexp->we_wordc + pwordexp->we_offs; |
22bc7978 UD |
182 | new_wordv = realloc (pwordexp->we_wordv, sizeof (char *) * num_p); |
183 | if (new_wordv != NULL) | |
8f2ece69 | 184 | { |
22bc7978 | 185 | pwordexp->we_wordv = new_wordv; |
05d5dedc UD |
186 | pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc++] = word; |
187 | pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc] = NULL; | |
8f2ece69 UD |
188 | return 0; |
189 | } | |
190 | ||
e7c8359e UD |
191 | if (allocated) |
192 | free (word); | |
193 | ||
c06cc21c | 194 | no_space: |
8f2ece69 UD |
195 | return WRDE_NOSPACE; |
196 | } | |
197 | ||
198 | /* The parse_*() functions should leave *offset being the offset in 'words' | |
199 | * to the last character processed. | |
200 | */ | |
201 | ||
202 | static int | |
dfd2257a | 203 | internal_function |
40a55d20 UD |
204 | parse_backslash (char **word, size_t *word_length, size_t *max_length, |
205 | const char *words, size_t *offset) | |
8f2ece69 UD |
206 | { |
207 | /* We are poised _at_ a backslash, not in quotes */ | |
208 | ||
209 | switch (words[1 + *offset]) | |
210 | { | |
211 | case 0: | |
212 | /* Backslash is last character of input words */ | |
213 | return WRDE_SYNTAX; | |
214 | ||
215 | case '\n': | |
86187531 | 216 | ++(*offset); |
8f2ece69 UD |
217 | break; |
218 | ||
219 | default: | |
40a55d20 | 220 | *word = w_addchar (*word, word_length, max_length, words[1 + *offset]); |
8f2ece69 UD |
221 | if (*word == NULL) |
222 | return WRDE_NOSPACE; | |
223 | ||
86187531 | 224 | ++(*offset); |
8f2ece69 UD |
225 | break; |
226 | } | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | static int | |
dfd2257a | 232 | internal_function |
40a55d20 UD |
233 | parse_qtd_backslash (char **word, size_t *word_length, size_t *max_length, |
234 | const char *words, size_t *offset) | |
8f2ece69 UD |
235 | { |
236 | /* We are poised _at_ a backslash, inside quotes */ | |
237 | ||
238 | switch (words[1 + *offset]) | |
239 | { | |
240 | case 0: | |
241 | /* Backslash is last character of input words */ | |
242 | return WRDE_SYNTAX; | |
243 | ||
244 | case '\n': | |
245 | ++(*offset); | |
246 | break; | |
247 | ||
248 | case '$': | |
249 | case '`': | |
250 | case '"': | |
251 | case '\\': | |
40a55d20 | 252 | *word = w_addchar (*word, word_length, max_length, words[1 + *offset]); |
8f2ece69 UD |
253 | if (*word == NULL) |
254 | return WRDE_NOSPACE; | |
255 | ||
40a55d20 | 256 | ++(*offset); |
8f2ece69 UD |
257 | break; |
258 | ||
259 | default: | |
40a55d20 UD |
260 | *word = w_addchar (*word, word_length, max_length, words[*offset]); |
261 | if (*word != NULL) | |
262 | *word = w_addchar (*word, word_length, max_length, words[1 + *offset]); | |
263 | ||
8f2ece69 UD |
264 | if (*word == NULL) |
265 | return WRDE_NOSPACE; | |
266 | ||
40a55d20 | 267 | ++(*offset); |
8f2ece69 UD |
268 | break; |
269 | } | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
274 | static int | |
dfd2257a | 275 | internal_function |
40a55d20 UD |
276 | parse_tilde (char **word, size_t *word_length, size_t *max_length, |
277 | const char *words, size_t *offset, size_t wordc) | |
8f2ece69 UD |
278 | { |
279 | /* We are poised _at_ a tilde */ | |
55c14926 | 280 | size_t i; |
8f2ece69 UD |
281 | |
282 | if (*word_length != 0) | |
283 | { | |
284 | if (!((*word)[*word_length - 1] == '=' && wordc == 0)) | |
285 | { | |
3db52d94 UD |
286 | if (!((*word)[*word_length - 1] == ':' |
287 | && strchr (*word, '=') && wordc == 0)) | |
8f2ece69 | 288 | { |
40a55d20 | 289 | *word = w_addchar (*word, word_length, max_length, '~'); |
8f2ece69 UD |
290 | return *word ? 0 : WRDE_NOSPACE; |
291 | } | |
292 | } | |
293 | } | |
294 | ||
295 | for (i = 1 + *offset; words[i]; i++) | |
296 | { | |
297 | if (words[i] == ':' || words[i] == '/' || words[i] == ' ' || | |
40a55d20 | 298 | words[i] == '\t' || words[i] == 0 ) |
8f2ece69 UD |
299 | break; |
300 | ||
301 | if (words[i] == '\\') | |
302 | { | |
40a55d20 | 303 | *word = w_addchar (*word, word_length, max_length, '~'); |
8f2ece69 UD |
304 | return *word ? 0 : WRDE_NOSPACE; |
305 | } | |
306 | } | |
307 | ||
308 | if (i == 1 + *offset) | |
309 | { | |
310 | /* Tilde appears on its own */ | |
311 | uid_t uid; | |
312 | struct passwd pwd, *tpwd; | |
313 | int buflen = 1000; | |
05d5dedc UD |
314 | char* home; |
315 | char* buffer; | |
8f2ece69 UD |
316 | int result; |
317 | ||
05d5dedc UD |
318 | /* POSIX.2 says ~ expands to $HOME and if HOME is unset the |
319 | results are unspecified. We do a lookup on the uid if | |
320 | HOME is unset. */ | |
8f2ece69 | 321 | |
05d5dedc UD |
322 | home = getenv ("HOME"); |
323 | if (home != NULL) | |
8f2ece69 | 324 | { |
05d5dedc | 325 | *word = w_addstr (*word, word_length, max_length, home); |
8f2ece69 UD |
326 | if (*word == NULL) |
327 | return WRDE_NOSPACE; | |
328 | } | |
329 | else | |
330 | { | |
05d5dedc UD |
331 | uid = __getuid (); |
332 | buffer = __alloca (buflen); | |
333 | ||
334 | while ((result = __getpwuid_r (uid, &pwd, buffer, buflen, &tpwd)) != 0 | |
335 | && errno == ERANGE) | |
fd2f9ee3 | 336 | buffer = extend_alloca (buffer, buflen, buflen + 1000); |
05d5dedc UD |
337 | |
338 | if (result == 0 && tpwd != NULL && pwd.pw_dir != NULL) | |
339 | { | |
340 | *word = w_addstr (*word, word_length, max_length, pwd.pw_dir); | |
341 | if (*word == NULL) | |
342 | return WRDE_NOSPACE; | |
343 | } | |
344 | else | |
345 | { | |
346 | *word = w_addchar (*word, word_length, max_length, '~'); | |
347 | if (*word == NULL) | |
348 | return WRDE_NOSPACE; | |
349 | } | |
8f2ece69 UD |
350 | } |
351 | } | |
352 | else | |
353 | { | |
354 | /* Look up user name in database to get home directory */ | |
344af000 | 355 | char *user = strndupa (&words[1 + *offset], i - (1 + *offset)); |
8f2ece69 UD |
356 | struct passwd pwd, *tpwd; |
357 | int buflen = 1000; | |
358 | char* buffer = __alloca (buflen); | |
359 | int result; | |
360 | ||
55c14926 | 361 | while ((result = __getpwnam_r (user, &pwd, buffer, buflen, &tpwd)) != 0 |
8f2ece69 | 362 | && errno == ERANGE) |
fd2f9ee3 | 363 | buffer = extend_alloca (buffer, buflen, buflen + 1000); |
8f2ece69 | 364 | |
c5f57c58 | 365 | if (result == 0 && tpwd != NULL && pwd.pw_dir) |
40a55d20 | 366 | *word = w_addstr (*word, word_length, max_length, pwd.pw_dir); |
8f2ece69 UD |
367 | else |
368 | { | |
369 | /* (invalid login name) */ | |
40a55d20 | 370 | *word = w_addchar (*word, word_length, max_length, '~'); |
8f2ece69 | 371 | if (*word != NULL) |
40a55d20 | 372 | *word = w_addstr (*word, word_length, max_length, user); |
8f2ece69 UD |
373 | } |
374 | ||
375 | *offset = i - 1; | |
376 | } | |
377 | return *word ? 0 : WRDE_NOSPACE; | |
378 | } | |
379 | ||
e9fc7bbb UD |
380 | |
381 | static int | |
382 | internal_function | |
383 | do_parse_glob (const char *glob_word, char **word, size_t *word_length, | |
384 | size_t *max_length, wordexp_t *pwordexp, const char *ifs, | |
385 | const char *ifs_white) | |
386 | { | |
387 | int error; | |
2e47aff5 | 388 | unsigned int match; |
e9fc7bbb UD |
389 | glob_t globbuf; |
390 | ||
391 | error = glob (glob_word, GLOB_NOCHECK, NULL, &globbuf); | |
392 | ||
393 | if (error != 0) | |
394 | { | |
395 | /* We can only run into memory problems. */ | |
396 | assert (error == GLOB_NOSPACE); | |
397 | return WRDE_NOSPACE; | |
398 | } | |
399 | ||
400 | if (ifs && !*ifs) | |
401 | { | |
402 | /* No field splitting allowed. */ | |
403 | assert (globbuf.gl_pathv[0] != NULL); | |
404 | *word = w_addstr (*word, word_length, max_length, globbuf.gl_pathv[0]); | |
405 | for (match = 1; match < globbuf.gl_pathc && *word != NULL; ++match) | |
406 | { | |
407 | *word = w_addchar (*word, word_length, max_length, ' '); | |
408 | if (*word != NULL) | |
409 | *word = w_addstr (*word, word_length, max_length, | |
410 | globbuf.gl_pathv[match]); | |
411 | } | |
412 | ||
413 | globfree (&globbuf); | |
414 | return *word ? 0 : WRDE_NOSPACE; | |
415 | } | |
416 | ||
417 | assert (ifs == NULL || *ifs != '\0'); | |
418 | if (*word != NULL) | |
419 | { | |
420 | free (*word); | |
421 | *word = w_newword (word_length, max_length); | |
422 | } | |
423 | ||
424 | for (match = 0; match < globbuf.gl_pathc; ++match) | |
425 | { | |
426 | char *matching_word = __strdup (globbuf.gl_pathv[match]); | |
427 | if (matching_word == NULL || w_addword (pwordexp, matching_word)) | |
428 | { | |
429 | globfree (&globbuf); | |
430 | return WRDE_NOSPACE; | |
431 | } | |
432 | } | |
433 | ||
434 | globfree (&globbuf); | |
435 | return 0; | |
436 | } | |
437 | ||
8f2ece69 | 438 | static int |
dfd2257a | 439 | internal_function |
40a55d20 UD |
440 | parse_glob (char **word, size_t *word_length, size_t *max_length, |
441 | const char *words, size_t *offset, int flags, | |
af69217f | 442 | wordexp_t *pwordexp, const char *ifs, const char *ifs_white) |
8f2ece69 | 443 | { |
2bcf29ba | 444 | /* We are poised just after a '*', a '[' or a '?'. */ |
e9fc7bbb | 445 | int error = WRDE_NOSPACE; |
2bcf29ba | 446 | int quoted = 0; /* 1 if singly-quoted, 2 if doubly */ |
57b36a0a | 447 | size_t i; |
e9fc7bbb | 448 | wordexp_t glob_list; /* List of words to glob */ |
8f2ece69 | 449 | |
e9fc7bbb UD |
450 | glob_list.we_wordc = 0; |
451 | glob_list.we_wordv = NULL; | |
452 | glob_list.we_offs = 0; | |
453 | for (; words[*offset] != '\0'; ++*offset) | |
2bcf29ba | 454 | { |
16d620db | 455 | if (strchr (ifs, words[*offset]) != NULL) |
9b3c7c3c | 456 | /* Reached IFS */ |
8f2ece69 UD |
457 | break; |
458 | ||
2bcf29ba UD |
459 | /* Sort out quoting */ |
460 | if (words[*offset] == '\'') | |
6e4c40ba | 461 | { |
2bcf29ba UD |
462 | if (quoted == 0) |
463 | { | |
464 | quoted = 1; | |
465 | continue; | |
466 | } | |
467 | else if (quoted == 1) | |
468 | { | |
469 | quoted = 0; | |
470 | continue; | |
471 | } | |
6e4c40ba | 472 | } |
2bcf29ba | 473 | else if (words[*offset] == '"') |
6e4c40ba UD |
474 | { |
475 | if (quoted == 0) | |
476 | { | |
477 | quoted = 2; | |
478 | continue; | |
479 | } | |
480 | else if (quoted == 2) | |
481 | { | |
482 | quoted = 0; | |
483 | continue; | |
484 | } | |
485 | } | |
8f2ece69 | 486 | |
2bcf29ba UD |
487 | /* Sort out other special characters */ |
488 | if (quoted != 1 && words[*offset] == '$') | |
489 | { | |
e9fc7bbb UD |
490 | error = parse_dollars (word, word_length, max_length, words, |
491 | offset, flags, &glob_list, ifs, ifs_white, | |
9b3c7c3c | 492 | quoted == 2); |
2bcf29ba | 493 | if (error) |
e9fc7bbb | 494 | goto tidy_up; |
2bcf29ba UD |
495 | |
496 | continue; | |
497 | } | |
498 | else if (words[*offset] == '\\') | |
499 | { | |
500 | if (quoted) | |
e9fc7bbb UD |
501 | error = parse_qtd_backslash (word, word_length, max_length, |
502 | words, offset); | |
2bcf29ba | 503 | else |
e9fc7bbb UD |
504 | error = parse_backslash (word, word_length, max_length, |
505 | words, offset); | |
2bcf29ba UD |
506 | |
507 | if (error) | |
e9fc7bbb | 508 | goto tidy_up; |
2bcf29ba UD |
509 | |
510 | continue; | |
511 | } | |
512 | ||
513 | *word = w_addchar (*word, word_length, max_length, words[*offset]); | |
514 | if (*word == NULL) | |
e9fc7bbb | 515 | goto tidy_up; |
2bcf29ba | 516 | } |
8f2ece69 | 517 | |
e9fc7bbb UD |
518 | /* Don't forget to re-parse the character we stopped at. */ |
519 | --*offset; | |
8f2ece69 | 520 | |
e9fc7bbb | 521 | /* Glob the words */ |
9b3c7c3c | 522 | error = w_addword (&glob_list, *word); |
e9fc7bbb UD |
523 | *word = w_newword (word_length, max_length); |
524 | for (i = 0; error == 0 && i < glob_list.we_wordc; i++) | |
525 | error = do_parse_glob (glob_list.we_wordv[i], word, word_length, | |
526 | max_length, pwordexp, ifs, ifs_white); | |
8f2ece69 | 527 | |
e9fc7bbb UD |
528 | /* Now tidy up */ |
529 | tidy_up: | |
530 | wordfree (&glob_list); | |
531 | return error; | |
8f2ece69 UD |
532 | } |
533 | ||
534 | static int | |
3db52d94 | 535 | internal_function |
40a55d20 UD |
536 | parse_squote (char **word, size_t *word_length, size_t *max_length, |
537 | const char *words, size_t *offset) | |
8f2ece69 UD |
538 | { |
539 | /* We are poised just after a single quote */ | |
540 | for (; words[*offset]; ++(*offset)) | |
541 | { | |
542 | if (words[*offset] != '\'') | |
543 | { | |
40a55d20 | 544 | *word = w_addchar (*word, word_length, max_length, words[*offset]); |
8f2ece69 UD |
545 | if (*word == NULL) |
546 | return WRDE_NOSPACE; | |
547 | } | |
548 | else return 0; | |
549 | } | |
550 | ||
551 | /* Unterminated string */ | |
552 | return WRDE_SYNTAX; | |
553 | } | |
554 | ||
555 | /* Functions to evaluate an arithmetic expression */ | |
556 | static int | |
dfd2257a | 557 | internal_function |
3db52d94 | 558 | eval_expr_val (char **expr, long int *result) |
28f540f4 | 559 | { |
8f2ece69 UD |
560 | char *digit; |
561 | ||
562 | /* Skip white space */ | |
563 | for (digit = *expr; digit && *digit && isspace (*digit); ++digit); | |
564 | ||
bcc86889 | 565 | if (*digit == '(') |
8f2ece69 | 566 | { |
8f2ece69 UD |
567 | /* Scan for closing paren */ |
568 | for (++digit; **expr && **expr != ')'; ++(*expr)); | |
569 | ||
570 | /* Is there one? */ | |
571 | if (!**expr) | |
572 | return WRDE_SYNTAX; | |
573 | ||
574 | *(*expr)++ = 0; | |
575 | ||
40a55d20 | 576 | if (eval_expr (digit, result)) |
8f2ece69 UD |
577 | return WRDE_SYNTAX; |
578 | ||
579 | return 0; | |
8f2ece69 UD |
580 | } |
581 | ||
bcc86889 UD |
582 | /* POSIX requires that decimal, octal, and hexadecimal constants are |
583 | recognized. Therefore we pass 0 as the third parameter to strtol. */ | |
584 | *result = strtol (digit, expr, 0); | |
585 | if (digit == *expr) | |
586 | return WRDE_SYNTAX; | |
8f2ece69 | 587 | |
8f2ece69 UD |
588 | return 0; |
589 | } | |
590 | ||
591 | static int | |
dfd2257a | 592 | internal_function |
3db52d94 | 593 | eval_expr_multdiv (char **expr, long int *result) |
8f2ece69 | 594 | { |
3db52d94 | 595 | long int arg; |
8f2ece69 UD |
596 | |
597 | /* Read a Value */ | |
3db52d94 | 598 | if (eval_expr_val (expr, result) != 0) |
8f2ece69 UD |
599 | return WRDE_SYNTAX; |
600 | ||
601 | while (**expr) | |
602 | { | |
603 | /* Skip white space */ | |
604 | for (; *expr && **expr && isspace (**expr); ++(*expr)); | |
605 | ||
606 | if (**expr == '*') | |
607 | { | |
3db52d94 UD |
608 | ++(*expr); |
609 | if (eval_expr_val (expr, &arg) != 0) | |
8f2ece69 UD |
610 | return WRDE_SYNTAX; |
611 | ||
612 | *result *= arg; | |
613 | } | |
614 | else if (**expr == '/') | |
615 | { | |
3db52d94 UD |
616 | ++(*expr); |
617 | if (eval_expr_val (expr, &arg) != 0) | |
8f2ece69 UD |
618 | return WRDE_SYNTAX; |
619 | ||
2b028564 FW |
620 | /* Division by zero or integer overflow. */ |
621 | if (arg == 0 || (arg == -1 && *result == LONG_MIN)) | |
622 | return WRDE_SYNTAX; | |
623 | ||
8f2ece69 UD |
624 | *result /= arg; |
625 | } | |
626 | else break; | |
627 | } | |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
632 | static int | |
dfd2257a | 633 | internal_function |
3db52d94 | 634 | eval_expr (char *expr, long int *result) |
8f2ece69 | 635 | { |
3db52d94 | 636 | long int arg; |
8f2ece69 UD |
637 | |
638 | /* Read a Multdiv */ | |
3db52d94 | 639 | if (eval_expr_multdiv (&expr, result) != 0) |
8f2ece69 UD |
640 | return WRDE_SYNTAX; |
641 | ||
642 | while (*expr) | |
643 | { | |
644 | /* Skip white space */ | |
645 | for (; expr && *expr && isspace (*expr); ++expr); | |
646 | ||
647 | if (*expr == '+') | |
648 | { | |
3db52d94 UD |
649 | ++expr; |
650 | if (eval_expr_multdiv (&expr, &arg) != 0) | |
8f2ece69 UD |
651 | return WRDE_SYNTAX; |
652 | ||
653 | *result += arg; | |
654 | } | |
655 | else if (*expr == '-') | |
656 | { | |
3db52d94 UD |
657 | ++expr; |
658 | if (eval_expr_multdiv (&expr, &arg) != 0) | |
8f2ece69 UD |
659 | return WRDE_SYNTAX; |
660 | ||
661 | *result -= arg; | |
662 | } | |
663 | else break; | |
664 | } | |
665 | ||
666 | return 0; | |
667 | } | |
668 | ||
669 | static int | |
dfd2257a | 670 | internal_function |
40a55d20 UD |
671 | parse_arith (char **word, size_t *word_length, size_t *max_length, |
672 | const char *words, size_t *offset, int flags, int bracket) | |
8f2ece69 UD |
673 | { |
674 | /* We are poised just after "$((" or "$[" */ | |
28f540f4 | 675 | int error; |
8f2ece69 | 676 | int paren_depth = 1; |
e9fc7bbb UD |
677 | size_t expr_length; |
678 | size_t expr_maxlen; | |
679 | char *expr; | |
8f2ece69 | 680 | |
e9fc7bbb | 681 | expr = w_newword (&expr_length, &expr_maxlen); |
8f2ece69 UD |
682 | for (; words[*offset]; ++(*offset)) |
683 | { | |
684 | switch (words[*offset]) | |
685 | { | |
686 | case '$': | |
40a55d20 | 687 | error = parse_dollars (&expr, &expr_length, &expr_maxlen, |
9b3c7c3c | 688 | words, offset, flags, NULL, NULL, NULL, 1); |
2bcf29ba | 689 | /* The ``1'' here is to tell parse_dollars not to |
8f2ece69 UD |
690 | * split the fields. |
691 | */ | |
692 | if (error) | |
693 | { | |
694 | free (expr); | |
695 | return error; | |
696 | } | |
697 | break; | |
698 | ||
699 | case '`': | |
700 | (*offset)++; | |
40a55d20 | 701 | error = parse_backtick (&expr, &expr_length, &expr_maxlen, |
af69217f UD |
702 | words, offset, flags, NULL, NULL, NULL); |
703 | /* The first NULL here is to tell parse_backtick not to | |
8f2ece69 UD |
704 | * split the fields. |
705 | */ | |
706 | if (error) | |
707 | { | |
708 | free (expr); | |
709 | return error; | |
710 | } | |
711 | break; | |
712 | ||
713 | case '\\': | |
40a55d20 UD |
714 | error = parse_qtd_backslash (&expr, &expr_length, &expr_maxlen, |
715 | words, offset); | |
8f2ece69 UD |
716 | if (error) |
717 | { | |
718 | free (expr); | |
719 | return error; | |
720 | } | |
721 | /* I think that a backslash within an | |
722 | * arithmetic expansion is bound to | |
723 | * cause an error sooner or later anyway though. | |
724 | */ | |
725 | break; | |
726 | ||
727 | case ')': | |
728 | if (--paren_depth == 0) | |
729 | { | |
86187531 | 730 | char result[21]; /* 21 = ceil(log10(2^64)) + 1 */ |
3db52d94 UD |
731 | long int numresult = 0; |
732 | long long int convertme; | |
8f2ece69 UD |
733 | |
734 | if (bracket || words[1 + *offset] != ')') | |
33c3e20e UD |
735 | { |
736 | free (expr); | |
737 | return WRDE_SYNTAX; | |
738 | } | |
8f2ece69 UD |
739 | |
740 | ++(*offset); | |
741 | ||
742 | /* Go - evaluate. */ | |
3db52d94 | 743 | if (*expr && eval_expr (expr, &numresult) != 0) |
33c3e20e UD |
744 | { |
745 | free (expr); | |
746 | return WRDE_SYNTAX; | |
747 | } | |
8f2ece69 | 748 | |
3db52d94 UD |
749 | if (numresult < 0) |
750 | { | |
751 | convertme = -numresult; | |
752 | *word = w_addchar (*word, word_length, max_length, '-'); | |
753 | if (!*word) | |
754 | { | |
755 | free (expr); | |
756 | return WRDE_NOSPACE; | |
757 | } | |
758 | } | |
759 | else | |
760 | convertme = numresult; | |
761 | ||
86187531 | 762 | result[20] = '\0'; |
7fbc8784 UD |
763 | *word = w_addstr (*word, word_length, max_length, |
764 | _itoa (convertme, &result[20], 10, 0)); | |
8f2ece69 UD |
765 | free (expr); |
766 | return *word ? 0 : WRDE_NOSPACE; | |
767 | } | |
40a55d20 | 768 | expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]); |
8f2ece69 UD |
769 | if (expr == NULL) |
770 | return WRDE_NOSPACE; | |
771 | ||
772 | break; | |
773 | ||
774 | case ']': | |
775 | if (bracket && paren_depth == 1) | |
776 | { | |
86187531 | 777 | char result[21]; /* 21 = ceil(log10(2^64)) + 1 */ |
3db52d94 | 778 | long int numresult = 0; |
8f2ece69 UD |
779 | |
780 | /* Go - evaluate. */ | |
781 | if (*expr && eval_expr (expr, &numresult) != 0) | |
33c3e20e UD |
782 | { |
783 | free (expr); | |
784 | return WRDE_SYNTAX; | |
785 | } | |
8f2ece69 | 786 | |
86187531 UD |
787 | result[20] = '\0'; |
788 | *word = w_addstr (*word, word_length, max_length, | |
789 | _itoa_word (numresult, &result[20], 10, 0)); | |
8f2ece69 UD |
790 | free (expr); |
791 | return *word ? 0 : WRDE_NOSPACE; | |
792 | } | |
793 | ||
794 | free (expr); | |
795 | return WRDE_SYNTAX; | |
796 | ||
797 | case '\n': | |
798 | case ';': | |
799 | case '{': | |
800 | case '}': | |
801 | free (expr); | |
802 | return WRDE_BADCHAR; | |
803 | ||
804 | case '(': | |
805 | ++paren_depth; | |
806 | default: | |
40a55d20 | 807 | expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]); |
8f2ece69 UD |
808 | if (expr == NULL) |
809 | return WRDE_NOSPACE; | |
810 | } | |
811 | } | |
812 | ||
813 | /* Premature end */ | |
814 | free (expr); | |
815 | return WRDE_SYNTAX; | |
816 | } | |
817 | ||
05d5dedc | 818 | /* Function called by child process in exec_comm() */ |
1b243ca9 | 819 | static inline void |
f89c41c1 | 820 | internal_function __attribute__ ((always_inline)) |
05d5dedc UD |
821 | exec_comm_child (char *comm, int *fildes, int showerr, int noexec) |
822 | { | |
823 | const char *args[4] = { _PATH_BSHELL, "-c", comm, NULL }; | |
824 | ||
825 | /* Execute the command, or just check syntax? */ | |
826 | if (noexec) | |
827 | args[1] = "-nc"; | |
828 | ||
829 | /* Redirect output. */ | |
a1ffb40e | 830 | if (__glibc_likely (fildes[1] != STDOUT_FILENO)) |
e038616f UD |
831 | { |
832 | __dup2 (fildes[1], STDOUT_FILENO); | |
833 | __close (fildes[1]); | |
834 | } | |
835 | else | |
836 | { | |
837 | #ifdef O_CLOEXEC | |
838 | /* Reset the close-on-exec flag (if necessary). */ | |
839 | # ifndef __ASSUME_PIPE2 | |
840 | if (__have_pipe2 > 0) | |
841 | # endif | |
842 | __fcntl (fildes[1], F_SETFD, 0); | |
843 | #endif | |
844 | } | |
05d5dedc UD |
845 | |
846 | /* Redirect stderr to /dev/null if we have to. */ | |
847 | if (showerr == 0) | |
848 | { | |
316ca440 | 849 | struct stat64 st; |
05d5dedc | 850 | int fd; |
e038616f | 851 | __close (STDERR_FILENO); |
05d5dedc | 852 | fd = __open (_PATH_DEVNULL, O_WRONLY); |
e038616f | 853 | if (fd >= 0 && fd != STDERR_FILENO) |
05d5dedc | 854 | { |
f1c30c98 | 855 | __dup2 (fd, STDERR_FILENO); |
05d5dedc UD |
856 | __close (fd); |
857 | } | |
316ca440 | 858 | /* Be paranoid. Check that we actually opened the /dev/null |
3ce1f295 | 859 | device. */ |
f1c30c98 | 860 | if (__builtin_expect (__fxstat64 (_STAT_VER, STDERR_FILENO, &st), 0) != 0 |
316ca440 UD |
861 | || __builtin_expect (S_ISCHR (st.st_mode), 1) == 0 |
862 | #if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR | |
863 | || st.st_rdev != makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR) | |
864 | #endif | |
865 | ) | |
866 | /* It's not the /dev/null device. Stop right here. The | |
3ce1f295 UD |
867 | problem is: how do we stop? We use _exit() with an |
868 | hopefully unusual exit code. */ | |
316ca440 | 869 | _exit (90); |
05d5dedc UD |
870 | } |
871 | ||
872 | /* Make sure the subshell doesn't field-split on our behalf. */ | |
4aebaa6b | 873 | __unsetenv ("IFS"); |
05d5dedc UD |
874 | |
875 | __close (fildes[0]); | |
876 | __execve (_PATH_BSHELL, (char *const *) args, __environ); | |
877 | ||
878 | /* Bad. What now? */ | |
879 | abort (); | |
880 | } | |
881 | ||
8f2ece69 UD |
882 | /* Function to execute a command and retrieve the results */ |
883 | /* pwordexp contains NULL if field-splitting is forbidden */ | |
884 | static int | |
dfd2257a | 885 | internal_function |
40a55d20 | 886 | exec_comm (char *comm, char **word, size_t *word_length, size_t *max_length, |
af69217f UD |
887 | int flags, wordexp_t *pwordexp, const char *ifs, |
888 | const char *ifs_white) | |
8f2ece69 | 889 | { |
40a55d20 | 890 | int fildes[2]; |
f89c41c1 | 891 | #define bufsize 128 |
8f2ece69 | 892 | int buflen; |
9b3c7c3c | 893 | int i; |
05d5dedc UD |
894 | int status = 0; |
895 | size_t maxnewlines = 0; | |
f89c41c1 | 896 | char buffer[bufsize]; |
28f540f4 | 897 | pid_t pid; |
f89c41c1 | 898 | int noexec = 0; |
28f540f4 | 899 | |
a39208bd CD |
900 | /* Do nothing if command substitution should not succeed. */ |
901 | if (flags & WRDE_NOCMD) | |
902 | return WRDE_CMDSUB; | |
903 | ||
8f2ece69 UD |
904 | /* Don't fork() unless necessary */ |
905 | if (!comm || !*comm) | |
906 | return 0; | |
28f540f4 | 907 | |
e038616f UD |
908 | #ifdef O_CLOEXEC |
909 | # ifndef __ASSUME_PIPE2 | |
910 | if (__have_pipe2 >= 0) | |
911 | # endif | |
912 | { | |
913 | int r = __pipe2 (fildes, O_CLOEXEC); | |
914 | # ifndef __ASSUME_PIPE2 | |
915 | if (__have_pipe2 == 0) | |
916 | __have_pipe2 = r != -1 || errno != ENOSYS ? 1 : -1; | |
917 | ||
918 | if (__have_pipe2 > 0) | |
919 | # endif | |
920 | if (r < 0) | |
921 | /* Bad */ | |
922 | return WRDE_NOSPACE; | |
923 | } | |
924 | #endif | |
925 | #ifndef __ASSUME_PIPE2 | |
926 | # ifdef O_CLOEXEC | |
927 | if (__have_pipe2 < 0) | |
928 | # endif | |
929 | if (__pipe (fildes) < 0) | |
930 | /* Bad */ | |
931 | return WRDE_NOSPACE; | |
932 | #endif | |
28f540f4 | 933 | |
f89c41c1 | 934 | again: |
50304ef0 | 935 | if ((pid = __fork ()) < 0) |
8f2ece69 UD |
936 | { |
937 | /* Bad */ | |
e038616f UD |
938 | __close (fildes[0]); |
939 | __close (fildes[1]); | |
8f2ece69 UD |
940 | return WRDE_NOSPACE; |
941 | } | |
28f540f4 RM |
942 | |
943 | if (pid == 0) | |
f89c41c1 | 944 | exec_comm_child (comm, fildes, noexec ? 0 : flags & WRDE_SHOWERR, noexec); |
28f540f4 | 945 | |
8f2ece69 UD |
946 | /* Parent */ |
947 | ||
f89c41c1 UD |
948 | /* If we are just testing the syntax, only wait. */ |
949 | if (noexec) | |
950 | return (TEMP_FAILURE_RETRY (__waitpid (pid, &status, 0)) == pid | |
951 | && status != 0) ? WRDE_SYNTAX : 0; | |
952 | ||
50304ef0 | 953 | __close (fildes[1]); |
f89c41c1 | 954 | fildes[1] = -1; |
28f540f4 | 955 | |
9b3c7c3c | 956 | if (!pwordexp) |
05d5dedc UD |
957 | /* Quoted - no field splitting */ |
958 | { | |
9b3c7c3c | 959 | while (1) |
8f2ece69 | 960 | { |
f89c41c1 UD |
961 | if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer, |
962 | bufsize))) < 1) | |
9b3c7c3c | 963 | { |
ab087e0a AS |
964 | /* If read returned 0 then the process has closed its |
965 | stdout. Don't use WNOHANG in that case to avoid busy | |
966 | looping until the process eventually exits. */ | |
967 | if (TEMP_FAILURE_RETRY (__waitpid (pid, &status, | |
968 | buflen == 0 ? 0 : WNOHANG)) | |
969 | == 0) | |
9b3c7c3c | 970 | continue; |
f89c41c1 UD |
971 | if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer, |
972 | bufsize))) < 1) | |
9b3c7c3c UD |
973 | break; |
974 | } | |
975 | ||
05d5dedc UD |
976 | maxnewlines += buflen; |
977 | ||
9b3c7c3c UD |
978 | *word = w_addmem (*word, word_length, max_length, buffer, buflen); |
979 | if (*word == NULL) | |
980 | goto no_space; | |
8f2ece69 | 981 | } |
9b3c7c3c UD |
982 | } |
983 | else | |
984 | /* Not quoted - split fields */ | |
985 | { | |
986 | int copying = 0; | |
987 | /* 'copying' is: | |
988 | * 0 when searching for first character in a field not IFS white space | |
989 | * 1 when copying the text of a field | |
990 | * 2 when searching for possible non-whitespace IFS | |
05d5dedc | 991 | * 3 when searching for non-newline after copying field |
9b3c7c3c UD |
992 | */ |
993 | ||
994 | while (1) | |
995 | { | |
f89c41c1 UD |
996 | if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer, |
997 | bufsize))) < 1) | |
9b3c7c3c | 998 | { |
ab087e0a AS |
999 | /* If read returned 0 then the process has closed its |
1000 | stdout. Don't use WNOHANG in that case to avoid busy | |
1001 | looping until the process eventually exits. */ | |
1002 | if (TEMP_FAILURE_RETRY (__waitpid (pid, &status, | |
1003 | buflen == 0 ? 0 : WNOHANG)) | |
1004 | == 0) | |
9b3c7c3c | 1005 | continue; |
f89c41c1 UD |
1006 | if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer, |
1007 | bufsize))) < 1) | |
9b3c7c3c UD |
1008 | break; |
1009 | } | |
a8125d85 | 1010 | |
9b3c7c3c UD |
1011 | for (i = 0; i < buflen; ++i) |
1012 | { | |
1013 | if (strchr (ifs, buffer[i]) != NULL) | |
1014 | { | |
1015 | /* Current character is IFS */ | |
1016 | if (strchr (ifs_white, buffer[i]) == NULL) | |
1017 | { | |
1018 | /* Current character is IFS but not whitespace */ | |
1019 | if (copying == 2) | |
1020 | { | |
1021 | /* current character | |
1022 | * | | |
1023 | * V | |
1024 | * eg: text<space><comma><space>moretext | |
1025 | * | |
1026 | * So, strip whitespace IFS (like at the start) | |
1027 | */ | |
1028 | copying = 0; | |
1029 | continue; | |
1030 | } | |
1031 | ||
1032 | copying = 0; | |
1033 | /* fall through and delimit field.. */ | |
1034 | } | |
1035 | else | |
1036 | { | |
05d5dedc UD |
1037 | if (buffer[i] == '\n') |
1038 | { | |
1039 | /* Current character is (IFS) newline */ | |
9b3c7c3c | 1040 | |
05d5dedc UD |
1041 | /* If copying a field, this is the end of it, |
1042 | but maybe all that's left is trailing newlines. | |
1043 | So start searching for a non-newline. */ | |
1044 | if (copying == 1) | |
1045 | copying = 3; | |
9b3c7c3c | 1046 | |
05d5dedc UD |
1047 | continue; |
1048 | } | |
1049 | else | |
1050 | { | |
1051 | /* Current character is IFS white space, but | |
1052 | not a newline */ | |
1053 | ||
1054 | /* If not either copying a field or searching | |
1055 | for non-newline after a field, ignore it */ | |
1056 | if (copying != 1 && copying != 3) | |
1057 | continue; | |
1058 | ||
1059 | /* End of field (search for non-ws IFS afterwards) */ | |
1060 | copying = 2; | |
1061 | } | |
9b3c7c3c UD |
1062 | } |
1063 | ||
05d5dedc | 1064 | /* First IFS white space (non-newline), or IFS non-whitespace. |
9b3c7c3c UD |
1065 | * Delimit the field. Nulls are converted by w_addword. */ |
1066 | if (w_addword (pwordexp, *word) == WRDE_NOSPACE) | |
1067 | goto no_space; | |
1068 | ||
1069 | *word = w_newword (word_length, max_length); | |
05d5dedc UD |
1070 | |
1071 | maxnewlines = 0; | |
9b3c7c3c UD |
1072 | /* fall back round the loop.. */ |
1073 | } | |
1074 | else | |
1075 | { | |
1076 | /* Not IFS character */ | |
05d5dedc UD |
1077 | |
1078 | if (copying == 3) | |
1079 | { | |
1080 | /* Nothing but (IFS) newlines since the last field, | |
3ce1f295 | 1081 | so delimit it here before starting new word */ |
05d5dedc UD |
1082 | if (w_addword (pwordexp, *word) == WRDE_NOSPACE) |
1083 | goto no_space; | |
1084 | ||
1085 | *word = w_newword (word_length, max_length); | |
1086 | } | |
1087 | ||
9b3c7c3c UD |
1088 | copying = 1; |
1089 | ||
05d5dedc UD |
1090 | if (buffer[i] == '\n') /* happens if newline not in IFS */ |
1091 | maxnewlines++; | |
1092 | else | |
1093 | maxnewlines = 0; | |
1094 | ||
9b3c7c3c UD |
1095 | *word = w_addchar (*word, word_length, max_length, |
1096 | buffer[i]); | |
1097 | if (*word == NULL) | |
1098 | goto no_space; | |
1099 | } | |
1100 | } | |
1101 | } | |
8f2ece69 | 1102 | } |
28f540f4 | 1103 | |
05d5dedc UD |
1104 | /* Chop off trailing newlines (required by POSIX.2) */ |
1105 | /* Ensure we don't go back further than the beginning of the | |
1106 | substitution (i.e. remove maxnewlines bytes at most) */ | |
1107 | while (maxnewlines-- != 0 && | |
3ce1f295 | 1108 | *word_length > 0 && (*word)[*word_length - 1] == '\n') |
1720f4d0 UD |
1109 | { |
1110 | (*word)[--*word_length] = '\0'; | |
1111 | ||
1ffaaca2 | 1112 | /* If the last word was entirely newlines, turn it into a new word |
1720f4d0 | 1113 | * which can be ignored if there's nothing following it. */ |
1ffaaca2 | 1114 | if (*word_length == 0) |
1720f4d0 UD |
1115 | { |
1116 | free (*word); | |
1117 | *word = w_newword (word_length, max_length); | |
1ffaaca2 | 1118 | break; |
1720f4d0 UD |
1119 | } |
1120 | } | |
22bc7978 | 1121 | |
50304ef0 | 1122 | __close (fildes[0]); |
f89c41c1 | 1123 | fildes[0] = -1; |
05d5dedc UD |
1124 | |
1125 | /* Check for syntax error (re-execute but with "-n" flag) */ | |
1126 | if (buflen < 1 && status != 0) | |
1127 | { | |
f89c41c1 UD |
1128 | noexec = 1; |
1129 | goto again; | |
05d5dedc UD |
1130 | } |
1131 | ||
8f2ece69 | 1132 | return 0; |
33c3e20e UD |
1133 | |
1134 | no_space: | |
1135 | __kill (pid, SIGKILL); | |
f89c41c1 | 1136 | TEMP_FAILURE_RETRY (__waitpid (pid, NULL, 0)); |
33c3e20e UD |
1137 | __close (fildes[0]); |
1138 | return WRDE_NOSPACE; | |
8f2ece69 UD |
1139 | } |
1140 | ||
1141 | static int | |
3db52d94 | 1142 | internal_function |
40a55d20 | 1143 | parse_comm (char **word, size_t *word_length, size_t *max_length, |
af69217f UD |
1144 | const char *words, size_t *offset, int flags, wordexp_t *pwordexp, |
1145 | const char *ifs, const char *ifs_white) | |
8f2ece69 UD |
1146 | { |
1147 | /* We are poised just after "$(" */ | |
1148 | int paren_depth = 1; | |
3c20b9b6 | 1149 | int error = 0; |
3c20b9b6 | 1150 | int quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */ |
e9fc7bbb UD |
1151 | size_t comm_length; |
1152 | size_t comm_maxlen; | |
1153 | char *comm = w_newword (&comm_length, &comm_maxlen); | |
8f2ece69 UD |
1154 | |
1155 | for (; words[*offset]; ++(*offset)) | |
28f540f4 | 1156 | { |
8f2ece69 | 1157 | switch (words[*offset]) |
28f540f4 | 1158 | { |
3c20b9b6 UD |
1159 | case '\'': |
1160 | if (quoted == 0) | |
1161 | quoted = 1; | |
1162 | else if (quoted == 1) | |
1163 | quoted = 0; | |
1164 | ||
1165 | break; | |
1166 | ||
1167 | case '"': | |
1168 | if (quoted == 0) | |
1169 | quoted = 2; | |
1170 | else if (quoted == 2) | |
1171 | quoted = 0; | |
1172 | ||
1173 | break; | |
1174 | ||
8f2ece69 | 1175 | case ')': |
3c20b9b6 | 1176 | if (!quoted && --paren_depth == 0) |
8f2ece69 UD |
1177 | { |
1178 | /* Go -- give script to the shell */ | |
3c20b9b6 UD |
1179 | if (comm) |
1180 | { | |
f1c30c98 UD |
1181 | #ifdef __libc_ptf_call |
1182 | /* We do not want the exec_comm call to be cut short | |
1183 | by a thread cancellation since cleanup is very | |
1184 | ugly. Therefore disable cancellation for | |
1185 | now. */ | |
1186 | // XXX Ideally we do want the thread being cancelable. | |
1187 | // XXX If demand is there we'll change it. | |
1188 | int state = PTHREAD_CANCEL_ENABLE; | |
e5d19c08 | 1189 | __libc_ptf_call (__pthread_setcancelstate, |
f1c30c98 UD |
1190 | (PTHREAD_CANCEL_DISABLE, &state), 0); |
1191 | #endif | |
1192 | ||
3c20b9b6 UD |
1193 | error = exec_comm (comm, word, word_length, max_length, |
1194 | flags, pwordexp, ifs, ifs_white); | |
f1c30c98 UD |
1195 | |
1196 | #ifdef __libc_ptf_call | |
e5d19c08 L |
1197 | __libc_ptf_call (__pthread_setcancelstate, |
1198 | (state, NULL), 0); | |
f1c30c98 UD |
1199 | #endif |
1200 | ||
3c20b9b6 UD |
1201 | free (comm); |
1202 | } | |
1203 | ||
8f2ece69 UD |
1204 | return error; |
1205 | } | |
1206 | ||
1207 | /* This is just part of the script */ | |
8f2ece69 UD |
1208 | break; |
1209 | ||
1210 | case '(': | |
3c20b9b6 UD |
1211 | if (!quoted) |
1212 | ++paren_depth; | |
28f540f4 | 1213 | } |
3c20b9b6 UD |
1214 | |
1215 | comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]); | |
1216 | if (comm == NULL) | |
1217 | return WRDE_NOSPACE; | |
28f540f4 | 1218 | } |
28f540f4 | 1219 | |
ecf359c6 UD |
1220 | /* Premature end. */ |
1221 | free (comm); | |
3c20b9b6 | 1222 | |
8f2ece69 UD |
1223 | return WRDE_SYNTAX; |
1224 | } | |
28f540f4 | 1225 | |
01d032e0 PP |
1226 | #define CHAR_IN_SET(ch, char_set) \ |
1227 | (memchr (char_set "", ch, sizeof (char_set) - 1) != NULL) | |
1228 | ||
8f2ece69 | 1229 | static int |
dfd2257a | 1230 | internal_function |
40a55d20 | 1231 | parse_param (char **word, size_t *word_length, size_t *max_length, |
af69217f | 1232 | const char *words, size_t *offset, int flags, wordexp_t *pwordexp, |
2bcf29ba | 1233 | const char *ifs, const char *ifs_white, int quoted) |
8f2ece69 UD |
1234 | { |
1235 | /* We are poised just after "$" */ | |
3c20b9b6 | 1236 | enum action |
af6f3906 | 1237 | { |
3c20b9b6 UD |
1238 | ACT_NONE, |
1239 | ACT_RP_SHORT_LEFT = '#', | |
1240 | ACT_RP_LONG_LEFT = 'L', | |
1241 | ACT_RP_SHORT_RIGHT = '%', | |
1242 | ACT_RP_LONG_RIGHT = 'R', | |
1243 | ACT_NULL_ERROR = '?', | |
1244 | ACT_NULL_SUBST = '-', | |
1245 | ACT_NONNULL_SUBST = '+', | |
1246 | ACT_NULL_ASSIGN = '=' | |
af6f3906 | 1247 | }; |
e9fc7bbb UD |
1248 | size_t env_length; |
1249 | size_t env_maxlen; | |
1250 | size_t pat_length; | |
1251 | size_t pat_maxlen; | |
3c20b9b6 | 1252 | size_t start = *offset; |
e9fc7bbb UD |
1253 | char *env; |
1254 | char *pattern; | |
2bcf29ba | 1255 | char *value = NULL; |
3c20b9b6 | 1256 | enum action action = ACT_NONE; |
8f2ece69 | 1257 | int depth = 0; |
3c20b9b6 | 1258 | int colon_seen = 0; |
14c44e2e | 1259 | int seen_hash = 0; |
76fbcfdd | 1260 | int free_value = 0; |
3c20b9b6 | 1261 | int pattern_is_quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */ |
8f2ece69 | 1262 | int error; |
1f4a9ebd UD |
1263 | int special = 0; |
1264 | char buffer[21]; | |
3c20b9b6 UD |
1265 | int brace = words[*offset] == '{'; |
1266 | ||
e9fc7bbb UD |
1267 | env = w_newword (&env_length, &env_maxlen); |
1268 | pattern = w_newword (&pat_length, &pat_maxlen); | |
1269 | ||
3c20b9b6 UD |
1270 | if (brace) |
1271 | ++*offset; | |
8f2ece69 | 1272 | |
1f4a9ebd UD |
1273 | /* First collect the parameter name. */ |
1274 | ||
1275 | if (words[*offset] == '#') | |
8f2ece69 | 1276 | { |
1f4a9ebd UD |
1277 | seen_hash = 1; |
1278 | if (!brace) | |
1279 | goto envsubst; | |
1280 | ++*offset; | |
1281 | } | |
af6f3906 | 1282 | |
1f4a9ebd UD |
1283 | if (isalpha (words[*offset]) || words[*offset] == '_') |
1284 | { | |
1285 | /* Normal parameter name. */ | |
1286 | do | |
1287 | { | |
1288 | env = w_addchar (env, &env_length, &env_maxlen, | |
1289 | words[*offset]); | |
1290 | if (env == NULL) | |
1291 | goto no_space; | |
1292 | } | |
1293 | while (isalnum (words[++*offset]) || words[*offset] == '_'); | |
1294 | } | |
1295 | else if (isdigit (words[*offset])) | |
1296 | { | |
1297 | /* Numeric parameter name. */ | |
1298 | special = 1; | |
1299 | do | |
1300 | { | |
1301 | env = w_addchar (env, &env_length, &env_maxlen, | |
1302 | words[*offset]); | |
1303 | if (env == NULL) | |
1304 | goto no_space; | |
1305 | if (!brace) | |
1306 | goto envsubst; | |
1307 | } | |
1308 | while (isdigit(words[++*offset])); | |
1309 | } | |
01d032e0 | 1310 | else if (CHAR_IN_SET (words[*offset], "*@$")) |
1f4a9ebd UD |
1311 | { |
1312 | /* Special parameter. */ | |
1313 | special = 1; | |
1314 | env = w_addchar (env, &env_length, &env_maxlen, | |
1315 | words[*offset]); | |
1316 | if (env == NULL) | |
1317 | goto no_space; | |
1318 | ++*offset; | |
1319 | } | |
1320 | else | |
1321 | { | |
1322 | if (brace) | |
1323 | goto syntax; | |
1324 | } | |
1325 | ||
1326 | if (brace) | |
1327 | { | |
1328 | /* Check for special action to be applied to the value. */ | |
1329 | switch (words[*offset]) | |
1330 | { | |
1331 | case '}': | |
68b50604 | 1332 | /* Evaluate. */ |
1f4a9ebd UD |
1333 | goto envsubst; |
1334 | ||
1335 | case '#': | |
1336 | action = ACT_RP_SHORT_LEFT; | |
1337 | if (words[1 + *offset] == '#') | |
1338 | { | |
1339 | ++*offset; | |
1340 | action = ACT_RP_LONG_LEFT; | |
1341 | } | |
1342 | break; | |
1343 | ||
1344 | case '%': | |
1345 | action = ACT_RP_SHORT_RIGHT; | |
1346 | if (words[1 + *offset] == '%') | |
1347 | { | |
1348 | ++*offset; | |
1349 | action = ACT_RP_LONG_RIGHT; | |
1350 | } | |
1351 | break; | |
1352 | ||
1353 | case ':': | |
01d032e0 | 1354 | if (!CHAR_IN_SET (words[1 + *offset], "-=?+")) |
1f4a9ebd UD |
1355 | goto syntax; |
1356 | ||
1357 | colon_seen = 1; | |
1358 | action = words[++*offset]; | |
1359 | break; | |
1360 | ||
1361 | case '-': | |
1362 | case '=': | |
1363 | case '?': | |
1364 | case '+': | |
1365 | action = words[*offset]; | |
1366 | break; | |
1367 | ||
1368 | default: | |
1369 | goto syntax; | |
1370 | } | |
1371 | ||
bac660f8 | 1372 | /* Now collect the pattern, but don't expand it yet. */ |
1f4a9ebd UD |
1373 | ++*offset; |
1374 | for (; words[*offset]; ++(*offset)) | |
3c20b9b6 UD |
1375 | { |
1376 | switch (words[*offset]) | |
8f2ece69 | 1377 | { |
3c20b9b6 UD |
1378 | case '{': |
1379 | if (!pattern_is_quoted) | |
1380 | ++depth; | |
1381 | break; | |
8f2ece69 | 1382 | |
3c20b9b6 UD |
1383 | case '}': |
1384 | if (!pattern_is_quoted) | |
1385 | { | |
1386 | if (depth == 0) | |
1387 | goto envsubst; | |
1388 | --depth; | |
1389 | } | |
8f2ece69 | 1390 | break; |
8f2ece69 | 1391 | |
3c20b9b6 | 1392 | case '\\': |
bac660f8 UD |
1393 | if (pattern_is_quoted) |
1394 | /* Quoted; treat as normal character. */ | |
1395 | break; | |
1396 | ||
1397 | /* Otherwise, it's an escape: next character is literal. */ | |
1398 | if (words[++*offset] == '\0') | |
3c20b9b6 | 1399 | goto syntax; |
bac660f8 UD |
1400 | |
1401 | pattern = w_addchar (pattern, &pat_length, &pat_maxlen, '\\'); | |
1402 | if (pattern == NULL) | |
1403 | goto no_space; | |
1404 | ||
3c20b9b6 | 1405 | break; |
af6f3906 | 1406 | |
3c20b9b6 UD |
1407 | case '\'': |
1408 | if (pattern_is_quoted == 0) | |
1409 | pattern_is_quoted = 1; | |
1410 | else if (pattern_is_quoted == 1) | |
1411 | pattern_is_quoted = 0; | |
8f2ece69 | 1412 | |
3c20b9b6 | 1413 | break; |
8f2ece69 | 1414 | |
3c20b9b6 UD |
1415 | case '"': |
1416 | if (pattern_is_quoted == 0) | |
1417 | pattern_is_quoted = 2; | |
1418 | else if (pattern_is_quoted == 2) | |
1419 | pattern_is_quoted = 0; | |
8f2ece69 | 1420 | |
3c20b9b6 | 1421 | break; |
8f2ece69 UD |
1422 | } |
1423 | ||
3c20b9b6 UD |
1424 | pattern = w_addchar (pattern, &pat_length, &pat_maxlen, |
1425 | words[*offset]); | |
1426 | if (pattern == NULL) | |
1427 | goto no_space; | |
8f2ece69 UD |
1428 | } |
1429 | } | |
1430 | ||
1f4a9ebd UD |
1431 | /* End of input string -- remember to reparse the character that we |
1432 | * stopped at. */ | |
8f2ece69 UD |
1433 | --(*offset); |
1434 | ||
1435 | envsubst: | |
1436 | if (words[start] == '{' && words[*offset] != '}') | |
af6f3906 | 1437 | goto syntax; |
8f2ece69 | 1438 | |
1f4a9ebd | 1439 | if (env == NULL) |
8f2ece69 | 1440 | { |
14c44e2e UD |
1441 | if (seen_hash) |
1442 | { | |
1443 | /* $# expands to the number of positional parameters */ | |
14c44e2e | 1444 | buffer[20] = '\0'; |
1f4a9ebd UD |
1445 | value = _itoa_word (__libc_argc - 1, &buffer[20], 10, 0); |
1446 | seen_hash = 0; | |
14c44e2e UD |
1447 | } |
1448 | else | |
1449 | { | |
1450 | /* Just $ on its own */ | |
1451 | *offset = start - 1; | |
1452 | *word = w_addchar (*word, word_length, max_length, '$'); | |
1f4a9ebd | 1453 | return *word ? 0 : WRDE_NOSPACE; |
14c44e2e | 1454 | } |
8f2ece69 | 1455 | } |
e9fc7bbb | 1456 | /* Is it a numeric parameter? */ |
1f4a9ebd UD |
1457 | else if (isdigit (env[0])) |
1458 | { | |
1459 | int n = atoi (env); | |
8f2ece69 | 1460 | |
1f4a9ebd UD |
1461 | if (n >= __libc_argc) |
1462 | /* Substitute NULL. */ | |
1463 | value = NULL; | |
1464 | else | |
1465 | /* Replace with appropriate positional parameter. */ | |
1466 | value = __libc_argv[n]; | |
1467 | } | |
14c44e2e | 1468 | /* Is it a special parameter? */ |
1f4a9ebd | 1469 | else if (special) |
2bcf29ba | 1470 | { |
1f4a9ebd UD |
1471 | /* Is it `$$'? */ |
1472 | if (*env == '$') | |
14c44e2e | 1473 | { |
1f4a9ebd | 1474 | buffer[20] = '\0'; |
50304ef0 | 1475 | value = _itoa_word (__getpid (), &buffer[20], 10, 0); |
14c44e2e | 1476 | } |
1f4a9ebd UD |
1477 | /* Is it `${#*}' or `${#@}'? */ |
1478 | else if ((*env == '*' || *env == '@') && seen_hash) | |
2bcf29ba | 1479 | { |
1f4a9ebd UD |
1480 | buffer[20] = '\0'; |
1481 | value = _itoa_word (__libc_argc > 0 ? __libc_argc - 1 : 0, | |
1482 | &buffer[20], 10, 0); | |
1483 | *word = w_addstr (*word, word_length, max_length, value); | |
14c44e2e | 1484 | free (env); |
ecf359c6 | 1485 | free (pattern); |
14c44e2e UD |
1486 | return *word ? 0 : WRDE_NOSPACE; |
1487 | } | |
1488 | /* Is it `$*' or `$@' (unquoted) ? */ | |
1489 | else if (*env == '*' || (*env == '@' && !quoted)) | |
1490 | { | |
68b50604 | 1491 | size_t plist_len = 0; |
14c44e2e | 1492 | int p; |
68b50604 | 1493 | char *end; |
14c44e2e | 1494 | |
2bcf29ba | 1495 | /* Build up value parameter by parameter (copy them) */ |
68b50604 UD |
1496 | for (p = 1; __libc_argv[p]; ++p) |
1497 | plist_len += strlen (__libc_argv[p]) + 1; /* for space */ | |
1498 | value = malloc (plist_len); | |
1499 | if (value == NULL) | |
1500 | goto no_space; | |
1501 | end = value; | |
1502 | *end = 0; | |
8d9618b7 | 1503 | for (p = 1; __libc_argv[p]; ++p) |
2bcf29ba | 1504 | { |
68b50604 UD |
1505 | if (p > 1) |
1506 | *end++ = ' '; | |
1507 | end = __stpcpy (end, __libc_argv[p]); | |
2bcf29ba UD |
1508 | } |
1509 | ||
76fbcfdd | 1510 | free_value = 1; |
2bcf29ba | 1511 | } |
1f4a9ebd UD |
1512 | else |
1513 | { | |
1514 | /* Must be a quoted `$@' */ | |
1515 | assert (*env == '@' && quoted); | |
2bcf29ba | 1516 | |
1f4a9ebd UD |
1517 | /* Each parameter is a separate word ("$@") */ |
1518 | if (__libc_argc == 2) | |
68b50604 | 1519 | value = __libc_argv[1]; |
1f4a9ebd UD |
1520 | else if (__libc_argc > 2) |
1521 | { | |
1522 | int p; | |
14c44e2e | 1523 | |
1f4a9ebd UD |
1524 | /* Append first parameter to current word. */ |
1525 | value = w_addstr (*word, word_length, max_length, | |
1526 | __libc_argv[1]); | |
1527 | if (value == NULL || w_addword (pwordexp, value)) | |
1528 | goto no_space; | |
14c44e2e | 1529 | |
1f4a9ebd UD |
1530 | for (p = 2; __libc_argv[p + 1]; p++) |
1531 | { | |
1532 | char *newword = __strdup (__libc_argv[p]); | |
1533 | if (newword == NULL || w_addword (pwordexp, newword)) | |
1534 | goto no_space; | |
1535 | } | |
2bcf29ba | 1536 | |
1f4a9ebd | 1537 | /* Start a new word with the last parameter. */ |
e9fc7bbb | 1538 | *word = w_newword (word_length, max_length); |
fdacb17d | 1539 | value = __libc_argv[p]; |
1f4a9ebd UD |
1540 | } |
1541 | else | |
2bcf29ba | 1542 | { |
1f4a9ebd UD |
1543 | free (env); |
1544 | free (pattern); | |
1545 | return 0; | |
2bcf29ba UD |
1546 | } |
1547 | } | |
2bcf29ba | 1548 | } |
1f4a9ebd | 1549 | else |
68b50604 UD |
1550 | value = getenv (env); |
1551 | ||
1552 | if (value == NULL && (flags & WRDE_UNDEF)) | |
1f4a9ebd | 1553 | { |
68b50604 | 1554 | /* Variable not defined. */ |
33c3e20e UD |
1555 | error = WRDE_BADVAL; |
1556 | goto do_error; | |
1f4a9ebd | 1557 | } |
8f2ece69 | 1558 | |
3c20b9b6 | 1559 | if (action != ACT_NONE) |
8f2ece69 | 1560 | { |
bac660f8 UD |
1561 | int expand_pattern = 0; |
1562 | ||
1563 | /* First, find out if we need to expand pattern (i.e. if we will | |
1564 | * use it). */ | |
1565 | switch (action) | |
1566 | { | |
1567 | case ACT_RP_SHORT_LEFT: | |
1568 | case ACT_RP_LONG_LEFT: | |
1569 | case ACT_RP_SHORT_RIGHT: | |
1570 | case ACT_RP_LONG_RIGHT: | |
1571 | /* Always expand for these. */ | |
1572 | expand_pattern = 1; | |
1573 | break; | |
1574 | ||
1575 | case ACT_NULL_ERROR: | |
1576 | case ACT_NULL_SUBST: | |
1577 | case ACT_NULL_ASSIGN: | |
1578 | if (!value || (!*value && colon_seen)) | |
1579 | /* If param is unset, or set but null and a colon has been seen, | |
1580 | the expansion of the pattern will be needed. */ | |
1581 | expand_pattern = 1; | |
1582 | ||
1583 | break; | |
1584 | ||
1585 | case ACT_NONNULL_SUBST: | |
1586 | /* Expansion of word will be needed if parameter is set and not null, | |
1587 | or set null but no colon has been seen. */ | |
1588 | if (value && (*value || !colon_seen)) | |
1589 | expand_pattern = 1; | |
1590 | ||
1591 | break; | |
1592 | ||
1593 | default: | |
1594 | assert (! "Unrecognised action!"); | |
1595 | } | |
1596 | ||
1597 | if (expand_pattern) | |
1598 | { | |
1599 | /* We need to perform tilde expansion, parameter expansion, | |
3ce1f295 | 1600 | command substitution, and arithmetic expansion. We also |
bac660f8 UD |
1601 | have to be a bit careful with wildcard characters, as |
1602 | pattern might be given to fnmatch soon. To do this, we | |
1603 | convert quotes to escapes. */ | |
1604 | ||
1605 | char *expanded; | |
1606 | size_t exp_len; | |
1607 | size_t exp_maxl; | |
1608 | char *p; | |
1609 | int quoted = 0; /* 1: single quotes; 2: double */ | |
1610 | ||
1611 | expanded = w_newword (&exp_len, &exp_maxl); | |
1612 | for (p = pattern; p && *p; p++) | |
1613 | { | |
4ad1f026 | 1614 | size_t offset; |
bac660f8 UD |
1615 | |
1616 | switch (*p) | |
1617 | { | |
1618 | case '"': | |
1619 | if (quoted == 2) | |
1620 | quoted = 0; | |
1621 | else if (quoted == 0) | |
1622 | quoted = 2; | |
1623 | else break; | |
1624 | ||
1625 | continue; | |
1626 | ||
1627 | case '\'': | |
1628 | if (quoted == 1) | |
1629 | quoted = 0; | |
1630 | else if (quoted == 0) | |
1631 | quoted = 1; | |
1632 | else break; | |
1633 | ||
1634 | continue; | |
1635 | ||
1636 | case '*': | |
1637 | case '?': | |
1638 | if (quoted) | |
1639 | { | |
1640 | /* Convert quoted wildchar to escaped wildchar. */ | |
1641 | expanded = w_addchar (expanded, &exp_len, | |
1642 | &exp_maxl, '\\'); | |
1643 | ||
1644 | if (expanded == NULL) | |
1645 | goto no_space; | |
1646 | } | |
1647 | break; | |
1648 | ||
1649 | case '$': | |
1650 | offset = 0; | |
1651 | error = parse_dollars (&expanded, &exp_len, &exp_maxl, p, | |
1652 | &offset, flags, NULL, NULL, NULL, 1); | |
1653 | if (error) | |
1654 | { | |
1655 | if (free_value) | |
1656 | free (value); | |
1657 | ||
ecf359c6 | 1658 | free (expanded); |
bac660f8 UD |
1659 | |
1660 | goto do_error; | |
1661 | } | |
1662 | ||
1663 | p += offset; | |
1664 | continue; | |
1665 | ||
1666 | case '~': | |
1667 | if (quoted || exp_len) | |
1668 | break; | |
1669 | ||
1670 | offset = 0; | |
1671 | error = parse_tilde (&expanded, &exp_len, &exp_maxl, p, | |
1672 | &offset, 0); | |
1673 | if (error) | |
1674 | { | |
1675 | if (free_value) | |
1676 | free (value); | |
1677 | ||
ecf359c6 | 1678 | free (expanded); |
bac660f8 UD |
1679 | |
1680 | goto do_error; | |
1681 | } | |
1682 | ||
1683 | p += offset; | |
1684 | continue; | |
1685 | ||
1686 | case '\\': | |
1687 | expanded = w_addchar (expanded, &exp_len, &exp_maxl, '\\'); | |
1688 | ++p; | |
1689 | assert (*p); /* checked when extracted initially */ | |
1690 | if (expanded == NULL) | |
1691 | goto no_space; | |
1692 | } | |
1693 | ||
1694 | expanded = w_addchar (expanded, &exp_len, &exp_maxl, *p); | |
1695 | ||
1696 | if (expanded == NULL) | |
1697 | goto no_space; | |
1698 | } | |
1699 | ||
ecf359c6 | 1700 | free (pattern); |
bac660f8 UD |
1701 | |
1702 | pattern = expanded; | |
1703 | } | |
1704 | ||
8f2ece69 UD |
1705 | switch (action) |
1706 | { | |
3c20b9b6 UD |
1707 | case ACT_RP_SHORT_LEFT: |
1708 | case ACT_RP_LONG_LEFT: | |
1709 | case ACT_RP_SHORT_RIGHT: | |
1710 | case ACT_RP_LONG_RIGHT: | |
af6f3906 UD |
1711 | { |
1712 | char *p; | |
1713 | char c; | |
1714 | char *end; | |
1715 | ||
1f4a9ebd | 1716 | if (value == NULL || pattern == NULL || *pattern == '\0') |
af6f3906 UD |
1717 | break; |
1718 | ||
1719 | end = value + strlen (value); | |
1720 | ||
3c20b9b6 | 1721 | switch (action) |
af6f3906 | 1722 | { |
3c20b9b6 | 1723 | case ACT_RP_SHORT_LEFT: |
3db52d94 | 1724 | for (p = value; p <= end; ++p) |
af6f3906 UD |
1725 | { |
1726 | c = *p; | |
1727 | *p = '\0'; | |
1728 | if (fnmatch (pattern, value, 0) != FNM_NOMATCH) | |
1729 | { | |
1730 | *p = c; | |
68b50604 UD |
1731 | if (free_value) |
1732 | { | |
1733 | char *newval = __strdup (p); | |
1734 | if (newval == NULL) | |
1735 | { | |
1736 | free (value); | |
1737 | goto no_space; | |
1738 | } | |
1739 | free (value); | |
1740 | value = newval; | |
1741 | } | |
1742 | else | |
1743 | value = p; | |
af6f3906 UD |
1744 | break; |
1745 | } | |
1746 | *p = c; | |
1747 | } | |
1748 | ||
1749 | break; | |
1750 | ||
3c20b9b6 | 1751 | case ACT_RP_LONG_LEFT: |
3db52d94 | 1752 | for (p = end; p >= value; --p) |
af6f3906 UD |
1753 | { |
1754 | c = *p; | |
1755 | *p = '\0'; | |
1756 | if (fnmatch (pattern, value, 0) != FNM_NOMATCH) | |
1757 | { | |
1758 | *p = c; | |
68b50604 UD |
1759 | if (free_value) |
1760 | { | |
1761 | char *newval = __strdup (p); | |
1762 | if (newval == NULL) | |
1763 | { | |
1764 | free (value); | |
1765 | goto no_space; | |
1766 | } | |
1767 | free (value); | |
1768 | value = newval; | |
1769 | } | |
1770 | else | |
1771 | value = p; | |
af6f3906 UD |
1772 | break; |
1773 | } | |
1774 | *p = c; | |
1775 | } | |
1776 | ||
1777 | break; | |
1778 | ||
3c20b9b6 | 1779 | case ACT_RP_SHORT_RIGHT: |
3db52d94 | 1780 | for (p = end; p >= value; --p) |
af6f3906 UD |
1781 | { |
1782 | if (fnmatch (pattern, p, 0) != FNM_NOMATCH) | |
1783 | { | |
1f4a9ebd UD |
1784 | char *newval; |
1785 | newval = malloc (p - value + 1); | |
33c3e20e | 1786 | |
1f4a9ebd | 1787 | if (newval == NULL) |
33c3e20e UD |
1788 | { |
1789 | if (free_value) | |
1790 | free (value); | |
1791 | goto no_space; | |
1792 | } | |
1793 | ||
1f4a9ebd UD |
1794 | *(char *) __mempcpy (newval, value, p - value) = '\0'; |
1795 | if (free_value) | |
1796 | free (value); | |
1797 | value = newval; | |
1798 | free_value = 1; | |
af6f3906 UD |
1799 | break; |
1800 | } | |
1801 | } | |
1802 | ||
1803 | break; | |
1804 | ||
3c20b9b6 | 1805 | case ACT_RP_LONG_RIGHT: |
3db52d94 | 1806 | for (p = value; p <= end; ++p) |
af6f3906 UD |
1807 | { |
1808 | if (fnmatch (pattern, p, 0) != FNM_NOMATCH) | |
1809 | { | |
1f4a9ebd UD |
1810 | char *newval; |
1811 | newval = malloc (p - value + 1); | |
33c3e20e | 1812 | |
1f4a9ebd | 1813 | if (newval == NULL) |
33c3e20e UD |
1814 | { |
1815 | if (free_value) | |
1816 | free (value); | |
1817 | goto no_space; | |
1818 | } | |
1819 | ||
1f4a9ebd UD |
1820 | *(char *) __mempcpy (newval, value, p - value) = '\0'; |
1821 | if (free_value) | |
1822 | free (value); | |
1823 | value = newval; | |
1824 | free_value = 1; | |
af6f3906 UD |
1825 | break; |
1826 | } | |
1827 | } | |
1828 | ||
1829 | break; | |
1830 | ||
1831 | default: | |
3c20b9b6 | 1832 | break; |
af6f3906 UD |
1833 | } |
1834 | ||
1835 | break; | |
1836 | } | |
8f2ece69 | 1837 | |
3c20b9b6 | 1838 | case ACT_NULL_ERROR: |
8f2ece69 | 1839 | if (value && *value) |
3db52d94 | 1840 | /* Substitute parameter */ |
8f2ece69 UD |
1841 | break; |
1842 | ||
bac660f8 | 1843 | error = 0; |
8f2ece69 | 1844 | if (!colon_seen && value) |
1f4a9ebd | 1845 | /* Substitute NULL */ |
bac660f8 | 1846 | ; |
1f4a9ebd UD |
1847 | else |
1848 | { | |
51028f34 UD |
1849 | const char *str = pattern; |
1850 | ||
1851 | if (str[0] == '\0') | |
6293b803 | 1852 | str = _("parameter null or not set"); |
51028f34 | 1853 | |
8a259a23 | 1854 | __fxprintf (NULL, "%s: %s\n", env, str); |
8f2ece69 UD |
1855 | } |
1856 | ||
68b50604 UD |
1857 | if (free_value) |
1858 | free (value); | |
33c3e20e | 1859 | goto do_error; |
8f2ece69 | 1860 | |
3c20b9b6 | 1861 | case ACT_NULL_SUBST: |
3db52d94 UD |
1862 | if (value && *value) |
1863 | /* Substitute parameter */ | |
1864 | break; | |
1865 | ||
11bf311e | 1866 | if (free_value) |
bac660f8 | 1867 | free (value); |
3db52d94 | 1868 | |
bac660f8 UD |
1869 | if (!colon_seen && value) |
1870 | /* Substitute NULL */ | |
1871 | goto success; | |
1f4a9ebd | 1872 | |
bac660f8 UD |
1873 | value = pattern ? __strdup (pattern) : pattern; |
1874 | free_value = 1; | |
3db52d94 | 1875 | |
bac660f8 UD |
1876 | if (pattern && !value) |
1877 | goto no_space; | |
3db52d94 | 1878 | |
bac660f8 | 1879 | break; |
8d9618b7 | 1880 | |
bac660f8 UD |
1881 | case ACT_NONNULL_SUBST: |
1882 | if (value && (*value || !colon_seen)) | |
1883 | { | |
11bf311e | 1884 | if (free_value) |
bac660f8 | 1885 | free (value); |
8d9618b7 | 1886 | |
bac660f8 UD |
1887 | value = pattern ? __strdup (pattern) : pattern; |
1888 | free_value = 1; | |
3db52d94 | 1889 | |
bac660f8 UD |
1890 | if (pattern && !value) |
1891 | goto no_space; | |
3db52d94 | 1892 | |
bac660f8 UD |
1893 | break; |
1894 | } | |
3db52d94 UD |
1895 | |
1896 | /* Substitute NULL */ | |
68b50604 UD |
1897 | if (free_value) |
1898 | free (value); | |
33c3e20e | 1899 | goto success; |
3db52d94 | 1900 | |
3c20b9b6 | 1901 | case ACT_NULL_ASSIGN: |
3db52d94 UD |
1902 | if (value && *value) |
1903 | /* Substitute parameter */ | |
1904 | break; | |
1905 | ||
1906 | if (!colon_seen && value) | |
1907 | { | |
1908 | /* Substitute NULL */ | |
68b50604 UD |
1909 | if (free_value) |
1910 | free (value); | |
33c3e20e | 1911 | goto success; |
3db52d94 UD |
1912 | } |
1913 | ||
ecf359c6 | 1914 | if (free_value) |
bac660f8 UD |
1915 | free (value); |
1916 | ||
1917 | value = pattern ? __strdup (pattern) : pattern; | |
1918 | free_value = 1; | |
1919 | ||
1920 | if (pattern && !value) | |
1921 | goto no_space; | |
1922 | ||
a2d4cf72 | 1923 | __setenv (env, value ?: "", 1); |
bac660f8 | 1924 | break; |
3db52d94 | 1925 | |
8f2ece69 | 1926 | default: |
3db52d94 | 1927 | assert (! "Unrecognised action!"); |
8f2ece69 UD |
1928 | } |
1929 | } | |
1930 | ||
ecf359c6 UD |
1931 | free (env); |
1932 | env = NULL; | |
1933 | free (pattern); | |
1934 | pattern = NULL; | |
8f2ece69 | 1935 | |
14c44e2e | 1936 | if (seen_hash) |
3db52d94 UD |
1937 | { |
1938 | char param_length[21]; | |
1939 | param_length[20] = '\0'; | |
1940 | *word = w_addstr (*word, word_length, max_length, | |
1f4a9ebd UD |
1941 | _itoa_word (value ? strlen (value) : 0, |
1942 | ¶m_length[20], 10, 0)); | |
1943 | if (free_value) | |
1944 | { | |
1945 | assert (value != NULL); | |
1946 | free (value); | |
1947 | } | |
1948 | ||
3db52d94 UD |
1949 | return *word ? 0 : WRDE_NOSPACE; |
1950 | } | |
1951 | ||
1f4a9ebd UD |
1952 | if (value == NULL) |
1953 | return 0; | |
1954 | ||
9b3c7c3c UD |
1955 | if (quoted || !pwordexp) |
1956 | { | |
1957 | /* Quoted - no field split */ | |
1958 | *word = w_addstr (*word, word_length, max_length, value); | |
1959 | if (free_value) | |
1960 | free (value); | |
af69217f | 1961 | |
9b3c7c3c UD |
1962 | return *word ? 0 : WRDE_NOSPACE; |
1963 | } | |
1964 | else | |
1965 | { | |
1966 | /* Need to field-split */ | |
1967 | char *value_copy = __strdup (value); /* Don't modify value */ | |
1968 | char *field_begin = value_copy; | |
1969 | int seen_nonws_ifs = 0; | |
1970 | ||
1971 | if (free_value) | |
1972 | free (value); | |
1973 | ||
1974 | if (value_copy == NULL) | |
1975 | goto no_space; | |
1976 | ||
1977 | do | |
1978 | { | |
1979 | char *field_end = field_begin; | |
1980 | char *next_field; | |
1981 | ||
1982 | /* If this isn't the first field, start a new word */ | |
1983 | if (field_begin != value_copy) | |
1984 | { | |
1985 | if (w_addword (pwordexp, *word) == WRDE_NOSPACE) | |
1986 | { | |
1987 | free (value_copy); | |
1988 | goto no_space; | |
1989 | } | |
1990 | ||
1991 | *word = w_newword (word_length, max_length); | |
1992 | } | |
1993 | ||
1994 | /* Skip IFS whitespace before the field */ | |
1995 | field_begin += strspn (field_begin, ifs_white); | |
1996 | ||
1997 | if (!seen_nonws_ifs && *field_begin == 0) | |
1998 | /* Nothing but whitespace */ | |
1999 | break; | |
2000 | ||
2001 | /* Search for the end of the field */ | |
2002 | field_end = field_begin + strcspn (field_begin, ifs); | |
2003 | ||
2004 | /* Set up pointer to the character after end of field and | |
3ce1f295 | 2005 | skip whitespace IFS after it. */ |
9b3c7c3c UD |
2006 | next_field = field_end + strspn (field_end, ifs_white); |
2007 | ||
2008 | /* Skip at most one non-whitespace IFS character after the field */ | |
2009 | seen_nonws_ifs = 0; | |
2010 | if (*next_field && strchr (ifs, *next_field)) | |
2011 | { | |
2012 | seen_nonws_ifs = 1; | |
2013 | next_field++; | |
2014 | } | |
2015 | ||
2016 | /* Null-terminate it */ | |
2017 | *field_end = 0; | |
2018 | ||
2019 | /* Tag a copy onto the current word */ | |
2020 | *word = w_addstr (*word, word_length, max_length, field_begin); | |
2021 | ||
2022 | if (*word == NULL && *field_begin != '\0') | |
2023 | { | |
2024 | free (value_copy); | |
2025 | goto no_space; | |
2026 | } | |
2027 | ||
2028 | field_begin = next_field; | |
2029 | } | |
2030 | while (seen_nonws_ifs || *field_begin); | |
2031 | ||
2032 | free (value_copy); | |
2033 | } | |
2034 | ||
2035 | return 0; | |
8f2ece69 | 2036 | |
33c3e20e UD |
2037 | success: |
2038 | error = 0; | |
2039 | goto do_error; | |
8f2ece69 | 2040 | |
33c3e20e UD |
2041 | no_space: |
2042 | error = WRDE_NOSPACE; | |
2043 | goto do_error; | |
af6f3906 UD |
2044 | |
2045 | syntax: | |
33c3e20e UD |
2046 | error = WRDE_SYNTAX; |
2047 | ||
2048 | do_error: | |
ecf359c6 | 2049 | free (env); |
af6f3906 | 2050 | |
ecf359c6 | 2051 | free (pattern); |
af6f3906 | 2052 | |
33c3e20e | 2053 | return error; |
8f2ece69 UD |
2054 | } |
2055 | ||
01d032e0 PP |
2056 | #undef CHAR_IN_SET |
2057 | ||
8f2ece69 | 2058 | static int |
dfd2257a | 2059 | internal_function |
40a55d20 UD |
2060 | parse_dollars (char **word, size_t *word_length, size_t *max_length, |
2061 | const char *words, size_t *offset, int flags, | |
2bcf29ba | 2062 | wordexp_t *pwordexp, const char *ifs, const char *ifs_white, |
9b3c7c3c | 2063 | int quoted) |
8f2ece69 UD |
2064 | { |
2065 | /* We are poised _at_ "$" */ | |
2066 | switch (words[1 + *offset]) | |
28f540f4 | 2067 | { |
8f2ece69 UD |
2068 | case '"': |
2069 | case '\'': | |
2070 | case 0: | |
40a55d20 | 2071 | *word = w_addchar (*word, word_length, max_length, '$'); |
8f2ece69 UD |
2072 | return *word ? 0 : WRDE_NOSPACE; |
2073 | ||
2074 | case '(': | |
2075 | if (words[2 + *offset] == '(') | |
2076 | { | |
2bcf29ba UD |
2077 | /* Differentiate between $((1+3)) and $((echo);(ls)) */ |
2078 | int i = 3 + *offset; | |
3c20b9b6 UD |
2079 | int depth = 0; |
2080 | while (words[i] && !(depth == 0 && words[i] == ')')) | |
2081 | { | |
2082 | if (words[i] == '(') | |
2083 | ++depth; | |
2084 | else if (words[i] == ')') | |
2085 | --depth; | |
2086 | ||
2087 | ++i; | |
2088 | } | |
2089 | ||
2bcf29ba UD |
2090 | if (words[i] == ')' && words[i + 1] == ')') |
2091 | { | |
2092 | (*offset) += 3; | |
2093 | /* Call parse_arith -- 0 is for "no brackets" */ | |
2094 | return parse_arith (word, word_length, max_length, words, offset, | |
2095 | flags, 0); | |
2096 | } | |
8f2ece69 UD |
2097 | } |
2098 | ||
8f2ece69 | 2099 | (*offset) += 2; |
40a55d20 | 2100 | return parse_comm (word, word_length, max_length, words, offset, flags, |
8d9618b7 | 2101 | quoted? NULL : pwordexp, ifs, ifs_white); |
8f2ece69 UD |
2102 | |
2103 | case '[': | |
2104 | (*offset) += 2; | |
2105 | /* Call parse_arith -- 1 is for "brackets" */ | |
40a55d20 UD |
2106 | return parse_arith (word, word_length, max_length, words, offset, flags, |
2107 | 1); | |
8f2ece69 UD |
2108 | |
2109 | case '{': | |
2110 | default: | |
2111 | ++(*offset); /* parse_param needs to know if "{" is there */ | |
40a55d20 | 2112 | return parse_param (word, word_length, max_length, words, offset, flags, |
2bcf29ba | 2113 | pwordexp, ifs, ifs_white, quoted); |
28f540f4 | 2114 | } |
8f2ece69 | 2115 | } |
28f540f4 | 2116 | |
8f2ece69 | 2117 | static int |
00995ca9 | 2118 | internal_function |
40a55d20 UD |
2119 | parse_backtick (char **word, size_t *word_length, size_t *max_length, |
2120 | const char *words, size_t *offset, int flags, | |
af69217f | 2121 | wordexp_t *pwordexp, const char *ifs, const char *ifs_white) |
8f2ece69 UD |
2122 | { |
2123 | /* We are poised just after "`" */ | |
2124 | int error; | |
8f2ece69 | 2125 | int squoting = 0; |
e9fc7bbb UD |
2126 | size_t comm_length; |
2127 | size_t comm_maxlen; | |
2128 | char *comm = w_newword (&comm_length, &comm_maxlen); | |
8f2ece69 UD |
2129 | |
2130 | for (; words[*offset]; ++(*offset)) | |
28f540f4 | 2131 | { |
8f2ece69 UD |
2132 | switch (words[*offset]) |
2133 | { | |
2134 | case '`': | |
2135 | /* Go -- give the script to the shell */ | |
40a55d20 | 2136 | error = exec_comm (comm, word, word_length, max_length, flags, |
af69217f | 2137 | pwordexp, ifs, ifs_white); |
8f2ece69 UD |
2138 | free (comm); |
2139 | return error; | |
2140 | ||
2141 | case '\\': | |
2142 | if (squoting) | |
2143 | { | |
40a55d20 UD |
2144 | error = parse_qtd_backslash (&comm, &comm_length, &comm_maxlen, |
2145 | words, offset); | |
8f2ece69 UD |
2146 | |
2147 | if (error) | |
2148 | { | |
2149 | free (comm); | |
2150 | return error; | |
2151 | } | |
2152 | ||
2153 | break; | |
2154 | } | |
2155 | ||
40a55d20 UD |
2156 | error = parse_backslash (&comm, &comm_length, &comm_maxlen, words, |
2157 | offset); | |
8f2ece69 UD |
2158 | |
2159 | if (error) | |
2160 | { | |
2161 | free (comm); | |
2162 | return error; | |
2163 | } | |
2164 | ||
2165 | break; | |
2166 | ||
2167 | case '\'': | |
2168 | squoting = 1 - squoting; | |
2169 | default: | |
40a55d20 | 2170 | comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]); |
8f2ece69 UD |
2171 | if (comm == NULL) |
2172 | return WRDE_NOSPACE; | |
2173 | } | |
28f540f4 RM |
2174 | } |
2175 | ||
8f2ece69 UD |
2176 | /* Premature end */ |
2177 | free (comm); | |
2178 | return WRDE_SYNTAX; | |
2179 | } | |
28f540f4 | 2180 | |
8f2ece69 | 2181 | static int |
dfd2257a | 2182 | internal_function |
40a55d20 | 2183 | parse_dquote (char **word, size_t *word_length, size_t *max_length, |
2bcf29ba UD |
2184 | const char *words, size_t *offset, int flags, |
2185 | wordexp_t *pwordexp, const char * ifs, const char * ifs_white) | |
8f2ece69 UD |
2186 | { |
2187 | /* We are poised just after a double-quote */ | |
2188 | int error; | |
2189 | ||
2190 | for (; words[*offset]; ++(*offset)) | |
2191 | { | |
2192 | switch (words[*offset]) | |
2193 | { | |
2194 | case '"': | |
2195 | return 0; | |
2196 | ||
2197 | case '$': | |
40a55d20 | 2198 | error = parse_dollars (word, word_length, max_length, words, offset, |
9b3c7c3c | 2199 | flags, pwordexp, ifs, ifs_white, 1); |
2bcf29ba UD |
2200 | /* The ``1'' here is to tell parse_dollars not to |
2201 | * split the fields. It may need to, however ("$@"). | |
8f2ece69 UD |
2202 | */ |
2203 | if (error) | |
2204 | return error; | |
28f540f4 | 2205 | |
8f2ece69 UD |
2206 | break; |
2207 | ||
2208 | case '`': | |
8f2ece69 | 2209 | ++(*offset); |
40a55d20 | 2210 | error = parse_backtick (word, word_length, max_length, words, |
af69217f UD |
2211 | offset, flags, NULL, NULL, NULL); |
2212 | /* The first NULL here is to tell parse_backtick not to | |
8f2ece69 UD |
2213 | * split the fields. |
2214 | */ | |
2215 | if (error) | |
2216 | return error; | |
2217 | ||
2218 | break; | |
2219 | ||
2220 | case '\\': | |
40a55d20 UD |
2221 | error = parse_qtd_backslash (word, word_length, max_length, words, |
2222 | offset); | |
8f2ece69 UD |
2223 | |
2224 | if (error) | |
2225 | return error; | |
2226 | ||
2227 | break; | |
2228 | ||
2229 | default: | |
40a55d20 | 2230 | *word = w_addchar (*word, word_length, max_length, words[*offset]); |
8f2ece69 UD |
2231 | if (*word == NULL) |
2232 | return WRDE_NOSPACE; | |
2233 | } | |
2234 | } | |
2235 | ||
2236 | /* Unterminated string */ | |
2237 | return WRDE_SYNTAX; | |
28f540f4 RM |
2238 | } |
2239 | ||
8f2ece69 UD |
2240 | /* |
2241 | * wordfree() is to be called after pwordexp is finished with. | |
2242 | */ | |
28f540f4 RM |
2243 | |
2244 | void | |
8f2ece69 | 2245 | wordfree (wordexp_t *pwordexp) |
28f540f4 | 2246 | { |
8f2ece69 UD |
2247 | |
2248 | /* wordexp can set pwordexp to NULL */ | |
2249 | if (pwordexp && pwordexp->we_wordv) | |
2250 | { | |
2251 | char **wordv = pwordexp->we_wordv; | |
2252 | ||
2253 | for (wordv += pwordexp->we_offs; *wordv; ++wordv) | |
2254 | free (*wordv); | |
2255 | ||
2256 | free (pwordexp->we_wordv); | |
2257 | pwordexp->we_wordv = NULL; | |
2258 | } | |
2259 | } | |
c41f555e | 2260 | libc_hidden_def (wordfree) |
8f2ece69 UD |
2261 | |
2262 | /* | |
2263 | * wordexp() | |
2264 | */ | |
2265 | ||
2266 | int | |
2267 | wordexp (const char *words, wordexp_t *pwordexp, int flags) | |
2268 | { | |
8f2ece69 | 2269 | size_t words_offset; |
e9fc7bbb UD |
2270 | size_t word_length; |
2271 | size_t max_length; | |
2272 | char *word = w_newword (&word_length, &max_length); | |
40a55d20 | 2273 | int error; |
8f2ece69 UD |
2274 | char *ifs; |
2275 | char ifs_white[4]; | |
05d5dedc | 2276 | wordexp_t old_word = *pwordexp; |
8f2ece69 UD |
2277 | |
2278 | if (flags & WRDE_REUSE) | |
22bc7978 UD |
2279 | { |
2280 | /* Minimal implementation of WRDE_REUSE for now */ | |
2281 | wordfree (pwordexp); | |
05d5dedc | 2282 | old_word.we_wordv = NULL; |
22bc7978 | 2283 | } |
8f2ece69 | 2284 | |
05d5dedc | 2285 | if ((flags & WRDE_APPEND) == 0) |
8f2ece69 | 2286 | { |
05d5dedc UD |
2287 | pwordexp->we_wordc = 0; |
2288 | ||
2289 | if (flags & WRDE_DOOFFS) | |
33c3e20e | 2290 | { |
05d5dedc UD |
2291 | pwordexp->we_wordv = calloc (1 + pwordexp->we_offs, sizeof (char *)); |
2292 | if (pwordexp->we_wordv == NULL) | |
2293 | { | |
2294 | error = WRDE_NOSPACE; | |
2295 | goto do_error; | |
2296 | } | |
33c3e20e | 2297 | } |
05d5dedc | 2298 | else |
33c3e20e | 2299 | { |
05d5dedc UD |
2300 | pwordexp->we_wordv = calloc (1, sizeof (char *)); |
2301 | if (pwordexp->we_wordv == NULL) | |
2302 | { | |
2303 | error = WRDE_NOSPACE; | |
2304 | goto do_error; | |
2305 | } | |
8f2ece69 | 2306 | |
05d5dedc UD |
2307 | pwordexp->we_offs = 0; |
2308 | } | |
8f2ece69 UD |
2309 | } |
2310 | ||
8f2ece69 UD |
2311 | /* Find out what the field separators are. |
2312 | * There are two types: whitespace and non-whitespace. | |
2313 | */ | |
2314 | ifs = getenv ("IFS"); | |
2315 | ||
16d620db | 2316 | if (ifs == NULL) |
6796bc80 UD |
2317 | /* IFS unset - use <space><tab><newline>. */ |
2318 | ifs = strcpy (ifs_white, " \t\n"); | |
8f2ece69 UD |
2319 | else |
2320 | { | |
2321 | char *ifsch = ifs; | |
2322 | char *whch = ifs_white; | |
2323 | ||
2324 | while (*ifsch != '\0') | |
af69217f | 2325 | { |
16d620db | 2326 | if (*ifsch == ' ' || *ifsch == '\t' || *ifsch == '\n') |
af69217f UD |
2327 | { |
2328 | /* Whitespace IFS. See first whether it is already in our | |
2329 | collection. */ | |
2330 | char *runp = ifs_white; | |
8f2ece69 | 2331 | |
16d620db | 2332 | while (runp < whch && *runp != *ifsch) |
af69217f | 2333 | ++runp; |
8f2ece69 | 2334 | |
af69217f UD |
2335 | if (runp == whch) |
2336 | *whch++ = *ifsch; | |
2337 | } | |
2338 | ||
3db52d94 | 2339 | ++ifsch; |
af69217f | 2340 | } |
8f2ece69 UD |
2341 | *whch = '\0'; |
2342 | } | |
2343 | ||
9b3c7c3c | 2344 | for (words_offset = 0 ; words[words_offset] ; ++words_offset) |
8f2ece69 UD |
2345 | switch (words[words_offset]) |
2346 | { | |
8f2ece69 | 2347 | case '\\': |
40a55d20 UD |
2348 | error = parse_backslash (&word, &word_length, &max_length, words, |
2349 | &words_offset); | |
8f2ece69 UD |
2350 | |
2351 | if (error) | |
2352 | goto do_error; | |
2353 | ||
2354 | break; | |
2355 | ||
2356 | case '$': | |
40a55d20 | 2357 | error = parse_dollars (&word, &word_length, &max_length, words, |
2bcf29ba | 2358 | &words_offset, flags, pwordexp, ifs, ifs_white, |
9b3c7c3c | 2359 | 0); |
8f2ece69 UD |
2360 | |
2361 | if (error) | |
2362 | goto do_error; | |
2363 | ||
2364 | break; | |
2365 | ||
2366 | case '`': | |
8f2ece69 | 2367 | ++words_offset; |
40a55d20 | 2368 | error = parse_backtick (&word, &word_length, &max_length, words, |
af69217f UD |
2369 | &words_offset, flags, pwordexp, ifs, |
2370 | ifs_white); | |
8f2ece69 UD |
2371 | |
2372 | if (error) | |
2373 | goto do_error; | |
2374 | ||
2375 | break; | |
2376 | ||
2377 | case '"': | |
2378 | ++words_offset; | |
40a55d20 | 2379 | error = parse_dquote (&word, &word_length, &max_length, words, |
2bcf29ba | 2380 | &words_offset, flags, pwordexp, ifs, ifs_white); |
8f2ece69 UD |
2381 | |
2382 | if (error) | |
2383 | goto do_error; | |
2384 | ||
a9c27b3e UD |
2385 | if (!word_length) |
2386 | { | |
2387 | error = w_addword (pwordexp, NULL); | |
2388 | ||
2389 | if (error) | |
2390 | return error; | |
2391 | } | |
2392 | ||
8f2ece69 UD |
2393 | break; |
2394 | ||
2395 | case '\'': | |
2396 | ++words_offset; | |
40a55d20 UD |
2397 | error = parse_squote (&word, &word_length, &max_length, words, |
2398 | &words_offset); | |
8f2ece69 UD |
2399 | |
2400 | if (error) | |
2401 | goto do_error; | |
2402 | ||
a9c27b3e UD |
2403 | if (!word_length) |
2404 | { | |
2405 | error = w_addword (pwordexp, NULL); | |
2406 | ||
2407 | if (error) | |
2408 | return error; | |
2409 | } | |
2410 | ||
8f2ece69 UD |
2411 | break; |
2412 | ||
2413 | case '~': | |
40a55d20 UD |
2414 | error = parse_tilde (&word, &word_length, &max_length, words, |
2415 | &words_offset, pwordexp->we_wordc); | |
8f2ece69 UD |
2416 | |
2417 | if (error) | |
2418 | goto do_error; | |
2419 | ||
2420 | break; | |
2421 | ||
2422 | case '*': | |
2bcf29ba UD |
2423 | case '[': |
2424 | case '?': | |
40a55d20 | 2425 | error = parse_glob (&word, &word_length, &max_length, words, |
af69217f | 2426 | &words_offset, flags, pwordexp, ifs, ifs_white); |
8f2ece69 UD |
2427 | |
2428 | if (error) | |
2429 | goto do_error; | |
2430 | ||
2431 | break; | |
2432 | ||
2433 | default: | |
c06cc21c | 2434 | /* Is it a word separator? */ |
9b3c7c3c | 2435 | if (strchr (" \t", words[words_offset]) == NULL) |
8f2ece69 | 2436 | { |
c06cc21c UD |
2437 | char ch = words[words_offset]; |
2438 | ||
2439 | /* Not a word separator -- but is it a valid word char? */ | |
2440 | if (strchr ("\n|&;<>(){}", ch)) | |
6796bc80 UD |
2441 | { |
2442 | /* Fail */ | |
bac660f8 UD |
2443 | error = WRDE_BADCHAR; |
2444 | goto do_error; | |
6796bc80 UD |
2445 | } |
2446 | ||
8f2ece69 | 2447 | /* "Ordinary" character -- add it to word */ |
40a55d20 | 2448 | word = w_addchar (word, &word_length, &max_length, |
c06cc21c | 2449 | ch); |
8f2ece69 UD |
2450 | if (word == NULL) |
2451 | { | |
2452 | error = WRDE_NOSPACE; | |
2453 | goto do_error; | |
2454 | } | |
2455 | ||
2456 | break; | |
2457 | } | |
2458 | ||
c06cc21c | 2459 | /* If a word has been delimited, add it to the list. */ |
40a55d20 | 2460 | if (word != NULL) |
8f2ece69 | 2461 | { |
9b3c7c3c | 2462 | error = w_addword (pwordexp, word); |
c06cc21c UD |
2463 | if (error) |
2464 | goto do_error; | |
8f2ece69 UD |
2465 | } |
2466 | ||
a8125d85 UD |
2467 | word = w_newword (&word_length, &max_length); |
2468 | } | |
8f2ece69 | 2469 | |
9b3c7c3c UD |
2470 | /* End of string */ |
2471 | ||
2472 | /* There was a word separator at the end */ | |
2473 | if (word == NULL) /* i.e. w_newword */ | |
2474 | return 0; | |
2475 | ||
2476 | /* There was no field separator at the end */ | |
2477 | return w_addword (pwordexp, word); | |
8f2ece69 UD |
2478 | |
2479 | do_error: | |
2480 | /* Error: | |
2bcf29ba | 2481 | * free memory used (unless error is WRDE_NOSPACE), and |
05d5dedc | 2482 | * set pwordexp members back to what they were. |
8f2ece69 | 2483 | */ |
2bcf29ba | 2484 | |
ecf359c6 | 2485 | free (word); |
8f2ece69 | 2486 | |
c06cc21c UD |
2487 | if (error == WRDE_NOSPACE) |
2488 | return WRDE_NOSPACE; | |
2489 | ||
05d5dedc UD |
2490 | if ((flags & WRDE_APPEND) == 0) |
2491 | wordfree (pwordexp); | |
2492 | ||
2493 | *pwordexp = old_word; | |
8f2ece69 | 2494 | return error; |
28f540f4 | 2495 | } |