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Commit | Line | Data |
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8f2ece69 | 1 | /* POSIX.2 wordexp implementation. |
af69217f | 2 | Copyright (C) 1997, 1998 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 UD |
6 | The GNU C Library is free software; you can redistribute it and/or |
7 | modify it under the terms of the GNU Library General Public License as | |
8 | published by the Free Software Foundation; either version 2 of the | |
9 | 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 | |
14 | Library General Public License for more details. | |
28f540f4 | 15 | |
c84142e8 UD |
16 | You should have received a copy of the GNU Library General Public |
17 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
18 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
28f540f4 | 20 | |
28f540f4 | 21 | #include <wordexp.h> |
28f540f4 | 22 | #include <signal.h> |
8f2ece69 UD |
23 | #include <stdlib.h> |
24 | #include <pwd.h> | |
25 | #include <sys/types.h> | |
26 | #include <string.h> | |
27 | #include <glob.h> | |
28 | #include <ctype.h> | |
29 | #include <sys/time.h> | |
30 | #include <sys/types.h> | |
31 | #include <sys/wait.h> | |
32 | #include <unistd.h> | |
33 | #include <fcntl.h> | |
34 | #include <sys/stat.h> | |
35 | #include <paths.h> | |
36 | #include <errno.h> | |
40a55d20 UD |
37 | #include <sys/param.h> |
38 | #include <stdio.h> | |
af6f3906 | 39 | #include <fnmatch.h> |
28f540f4 | 40 | |
86187531 UD |
41 | #include <stdio-common/_itoa.h> |
42 | ||
af6f3906 UD |
43 | /* Undefine the following line for the production version. */ |
44 | /* #define NDEBUG 1 */ | |
8f2ece69 | 45 | #include <assert.h> |
28f540f4 | 46 | |
8f2ece69 UD |
47 | /* |
48 | * This is a recursive-descent-style word expansion routine. | |
49 | */ | |
50 | ||
14c44e2e UD |
51 | /* These variables are defined and initialized in the startup code. */ |
52 | extern int __libc_argc; | |
2bcf29ba UD |
53 | extern char **__libc_argv; |
54 | ||
8f2ece69 | 55 | /* Some forward declarations */ |
40a55d20 UD |
56 | static int parse_dollars (char **word, size_t *word_length, size_t *max_length, |
57 | const char *words, size_t *offset, int flags, | |
af69217f | 58 | wordexp_t *pwordexp, const char *ifs, |
9b3c7c3c | 59 | const char *ifs_white, int quoted) |
dfd2257a | 60 | internal_function; |
40a55d20 UD |
61 | static int parse_backtick (char **word, size_t *word_length, |
62 | size_t *max_length, const char *words, | |
af69217f UD |
63 | size_t *offset, int flags, wordexp_t *pwordexp, |
64 | const char *ifs, const char *ifs_white) | |
dfd2257a | 65 | internal_function; |
22bc7978 UD |
66 | static int parse_dquote (char **word, size_t *word_length, size_t *max_length, |
67 | const char *words, size_t *offset, int flags, | |
68 | wordexp_t *pwordexp, const char *ifs, | |
69 | const char *ifs_white) | |
70 | internal_function; | |
3db52d94 | 71 | static int eval_expr (char *expr, long int *result) internal_function; |
8f2ece69 | 72 | |
55c14926 | 73 | /* The w_*() functions manipulate word lists. */ |
8f2ece69 | 74 | |
40a55d20 UD |
75 | #define W_CHUNK (100) |
76 | ||
1720f4d0 | 77 | /* Result of w_newword will be ignored if it the last word. */ |
e9fc7bbb UD |
78 | static inline char * |
79 | w_newword (size_t *actlen, size_t *maxlen) | |
80 | { | |
81 | *actlen = *maxlen = 0; | |
82 | return NULL; | |
83 | } | |
84 | ||
40a55d20 UD |
85 | static inline char * |
86 | w_addchar (char *buffer, size_t *actlen, size_t *maxlen, char ch) | |
87 | /* (lengths exclude trailing zero) */ | |
8f2ece69 | 88 | { |
40a55d20 | 89 | /* Add a character to the buffer, allocating room for it if needed. |
28f540f4 RM |
90 | */ |
91 | ||
40a55d20 | 92 | if (*actlen == *maxlen) |
8f2ece69 | 93 | { |
40a55d20 UD |
94 | char *old_buffer = buffer; |
95 | assert (buffer == NULL || *maxlen != 0); | |
96 | *maxlen += W_CHUNK; | |
97 | buffer = realloc (buffer, 1 + *maxlen); | |
98 | ||
99 | if (buffer == NULL) | |
100 | free (old_buffer); | |
101 | } | |
28f540f4 | 102 | |
40a55d20 UD |
103 | if (buffer != NULL) |
104 | { | |
105 | buffer[*actlen] = ch; | |
106 | buffer[++(*actlen)] = '\0'; | |
8f2ece69 | 107 | } |
40a55d20 UD |
108 | |
109 | return buffer; | |
8f2ece69 UD |
110 | } |
111 | ||
40a55d20 | 112 | static char * |
3db52d94 UD |
113 | internal_function |
114 | w_addmem (char *buffer, size_t *actlen, size_t *maxlen, const char *str, | |
115 | size_t len) | |
8f2ece69 | 116 | { |
40a55d20 | 117 | /* Add a string to the buffer, allocating room for it if needed. |
8f2ece69 | 118 | */ |
40a55d20 | 119 | if (*actlen + len > *maxlen) |
8f2ece69 | 120 | { |
40a55d20 UD |
121 | char *old_buffer = buffer; |
122 | assert (buffer == NULL || *maxlen != 0); | |
123 | *maxlen += MAX (2 * len, W_CHUNK); | |
124 | buffer = realloc (old_buffer, 1 + *maxlen); | |
125 | ||
126 | if (buffer == NULL) | |
127 | free (old_buffer); | |
8f2ece69 | 128 | } |
8f2ece69 | 129 | |
40a55d20 UD |
130 | if (buffer != NULL) |
131 | { | |
86187531 | 132 | *((char *) __mempcpy (&buffer[*actlen], str, len)) = '\0'; |
40a55d20 | 133 | *actlen += len; |
40a55d20 | 134 | } |
8f2ece69 | 135 | |
40a55d20 | 136 | return buffer; |
8f2ece69 UD |
137 | } |
138 | ||
3db52d94 UD |
139 | static char * |
140 | internal_function | |
141 | w_addstr (char *buffer, size_t *actlen, size_t *maxlen, const char *str) | |
142 | /* (lengths exclude trailing zero) */ | |
143 | { | |
144 | /* Add a string to the buffer, allocating room for it if needed. | |
145 | */ | |
146 | size_t len; | |
147 | ||
148 | assert (str != NULL); /* w_addstr only called from this file */ | |
149 | len = strlen (str); | |
150 | ||
151 | return w_addmem (buffer, actlen, maxlen, str, len); | |
152 | } | |
153 | ||
8f2ece69 | 154 | static int |
3db52d94 | 155 | internal_function |
8f2ece69 UD |
156 | w_addword (wordexp_t *pwordexp, char *word) |
157 | { | |
158 | /* Add a word to the wordlist */ | |
159 | size_t num_p; | |
22bc7978 | 160 | char **new_wordv; |
8f2ece69 | 161 | |
c06cc21c UD |
162 | /* Internally, NULL acts like "". Convert NULLs to "" before |
163 | * the caller sees them. | |
164 | */ | |
165 | if (word == NULL) | |
166 | { | |
167 | word = __strdup (""); | |
168 | if (word == NULL) | |
169 | goto no_space; | |
170 | } | |
171 | ||
8f2ece69 | 172 | num_p = 2 + pwordexp->we_wordc + pwordexp->we_offs; |
22bc7978 UD |
173 | new_wordv = realloc (pwordexp->we_wordv, sizeof (char *) * num_p); |
174 | if (new_wordv != NULL) | |
8f2ece69 | 175 | { |
22bc7978 | 176 | pwordexp->we_wordv = new_wordv; |
8f2ece69 UD |
177 | pwordexp->we_wordv[pwordexp->we_wordc++] = word; |
178 | pwordexp->we_wordv[pwordexp->we_wordc] = NULL; | |
179 | return 0; | |
180 | } | |
181 | ||
c06cc21c | 182 | no_space: |
8f2ece69 UD |
183 | return WRDE_NOSPACE; |
184 | } | |
185 | ||
186 | /* The parse_*() functions should leave *offset being the offset in 'words' | |
187 | * to the last character processed. | |
188 | */ | |
189 | ||
190 | static int | |
dfd2257a | 191 | internal_function |
40a55d20 UD |
192 | parse_backslash (char **word, size_t *word_length, size_t *max_length, |
193 | const char *words, size_t *offset) | |
8f2ece69 UD |
194 | { |
195 | /* We are poised _at_ a backslash, not in quotes */ | |
196 | ||
197 | switch (words[1 + *offset]) | |
198 | { | |
199 | case 0: | |
200 | /* Backslash is last character of input words */ | |
201 | return WRDE_SYNTAX; | |
202 | ||
203 | case '\n': | |
86187531 | 204 | ++(*offset); |
8f2ece69 UD |
205 | break; |
206 | ||
207 | default: | |
40a55d20 | 208 | *word = w_addchar (*word, word_length, max_length, words[1 + *offset]); |
8f2ece69 UD |
209 | if (*word == NULL) |
210 | return WRDE_NOSPACE; | |
211 | ||
86187531 | 212 | ++(*offset); |
8f2ece69 UD |
213 | break; |
214 | } | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | static int | |
dfd2257a | 220 | internal_function |
40a55d20 UD |
221 | parse_qtd_backslash (char **word, size_t *word_length, size_t *max_length, |
222 | const char *words, size_t *offset) | |
8f2ece69 UD |
223 | { |
224 | /* We are poised _at_ a backslash, inside quotes */ | |
225 | ||
226 | switch (words[1 + *offset]) | |
227 | { | |
228 | case 0: | |
229 | /* Backslash is last character of input words */ | |
230 | return WRDE_SYNTAX; | |
231 | ||
232 | case '\n': | |
233 | ++(*offset); | |
234 | break; | |
235 | ||
236 | case '$': | |
237 | case '`': | |
238 | case '"': | |
239 | case '\\': | |
40a55d20 | 240 | *word = w_addchar (*word, word_length, max_length, words[1 + *offset]); |
8f2ece69 UD |
241 | if (*word == NULL) |
242 | return WRDE_NOSPACE; | |
243 | ||
40a55d20 | 244 | ++(*offset); |
8f2ece69 UD |
245 | break; |
246 | ||
247 | default: | |
40a55d20 UD |
248 | *word = w_addchar (*word, word_length, max_length, words[*offset]); |
249 | if (*word != NULL) | |
250 | *word = w_addchar (*word, word_length, max_length, words[1 + *offset]); | |
251 | ||
8f2ece69 UD |
252 | if (*word == NULL) |
253 | return WRDE_NOSPACE; | |
254 | ||
40a55d20 | 255 | ++(*offset); |
8f2ece69 UD |
256 | break; |
257 | } | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | static int | |
dfd2257a | 263 | internal_function |
40a55d20 UD |
264 | parse_tilde (char **word, size_t *word_length, size_t *max_length, |
265 | const char *words, size_t *offset, size_t wordc) | |
8f2ece69 UD |
266 | { |
267 | /* We are poised _at_ a tilde */ | |
55c14926 | 268 | size_t i; |
8f2ece69 UD |
269 | |
270 | if (*word_length != 0) | |
271 | { | |
272 | if (!((*word)[*word_length - 1] == '=' && wordc == 0)) | |
273 | { | |
3db52d94 UD |
274 | if (!((*word)[*word_length - 1] == ':' |
275 | && strchr (*word, '=') && wordc == 0)) | |
8f2ece69 | 276 | { |
40a55d20 | 277 | *word = w_addchar (*word, word_length, max_length, '~'); |
8f2ece69 UD |
278 | return *word ? 0 : WRDE_NOSPACE; |
279 | } | |
280 | } | |
281 | } | |
282 | ||
283 | for (i = 1 + *offset; words[i]; i++) | |
284 | { | |
285 | if (words[i] == ':' || words[i] == '/' || words[i] == ' ' || | |
40a55d20 | 286 | words[i] == '\t' || words[i] == 0 ) |
8f2ece69 UD |
287 | break; |
288 | ||
289 | if (words[i] == '\\') | |
290 | { | |
40a55d20 | 291 | *word = w_addchar (*word, word_length, max_length, '~'); |
8f2ece69 UD |
292 | return *word ? 0 : WRDE_NOSPACE; |
293 | } | |
294 | } | |
295 | ||
296 | if (i == 1 + *offset) | |
297 | { | |
298 | /* Tilde appears on its own */ | |
299 | uid_t uid; | |
300 | struct passwd pwd, *tpwd; | |
301 | int buflen = 1000; | |
302 | char* buffer = __alloca (buflen); | |
303 | int result; | |
304 | ||
50304ef0 | 305 | uid = __getuid (); |
8f2ece69 | 306 | |
55c14926 | 307 | while ((result = __getpwuid_r (uid, &pwd, buffer, buflen, &tpwd)) != 0 |
8f2ece69 UD |
308 | && errno == ERANGE) |
309 | { | |
310 | buflen += 1000; | |
311 | buffer = __alloca (buflen); | |
312 | } | |
313 | ||
314 | if (result == 0 && pwd.pw_dir != NULL) | |
315 | { | |
40a55d20 | 316 | *word = w_addstr (*word, word_length, max_length, pwd.pw_dir); |
8f2ece69 UD |
317 | if (*word == NULL) |
318 | return WRDE_NOSPACE; | |
319 | } | |
320 | else | |
321 | { | |
40a55d20 | 322 | *word = w_addchar (*word, word_length, max_length, '~'); |
8f2ece69 UD |
323 | if (*word == NULL) |
324 | return WRDE_NOSPACE; | |
325 | } | |
326 | } | |
327 | else | |
328 | { | |
329 | /* Look up user name in database to get home directory */ | |
40a55d20 | 330 | char *user = __strndup (&words[1 + *offset], i - *offset); |
8f2ece69 UD |
331 | struct passwd pwd, *tpwd; |
332 | int buflen = 1000; | |
333 | char* buffer = __alloca (buflen); | |
334 | int result; | |
335 | ||
55c14926 | 336 | while ((result = __getpwnam_r (user, &pwd, buffer, buflen, &tpwd)) != 0 |
8f2ece69 UD |
337 | && errno == ERANGE) |
338 | { | |
339 | buflen += 1000; | |
340 | buffer = __alloca (buflen); | |
341 | } | |
342 | ||
343 | if (result == 0 && pwd.pw_dir) | |
40a55d20 | 344 | *word = w_addstr (*word, word_length, max_length, pwd.pw_dir); |
8f2ece69 UD |
345 | else |
346 | { | |
347 | /* (invalid login name) */ | |
40a55d20 | 348 | *word = w_addchar (*word, word_length, max_length, '~'); |
8f2ece69 | 349 | if (*word != NULL) |
40a55d20 | 350 | *word = w_addstr (*word, word_length, max_length, user); |
8f2ece69 UD |
351 | } |
352 | ||
353 | *offset = i - 1; | |
354 | } | |
355 | return *word ? 0 : WRDE_NOSPACE; | |
356 | } | |
357 | ||
e9fc7bbb UD |
358 | |
359 | static int | |
360 | internal_function | |
361 | do_parse_glob (const char *glob_word, char **word, size_t *word_length, | |
362 | size_t *max_length, wordexp_t *pwordexp, const char *ifs, | |
363 | const char *ifs_white) | |
364 | { | |
365 | int error; | |
366 | int match; | |
367 | glob_t globbuf; | |
368 | ||
369 | error = glob (glob_word, GLOB_NOCHECK, NULL, &globbuf); | |
370 | ||
371 | if (error != 0) | |
372 | { | |
373 | /* We can only run into memory problems. */ | |
374 | assert (error == GLOB_NOSPACE); | |
375 | return WRDE_NOSPACE; | |
376 | } | |
377 | ||
378 | if (ifs && !*ifs) | |
379 | { | |
380 | /* No field splitting allowed. */ | |
381 | assert (globbuf.gl_pathv[0] != NULL); | |
382 | *word = w_addstr (*word, word_length, max_length, globbuf.gl_pathv[0]); | |
383 | for (match = 1; match < globbuf.gl_pathc && *word != NULL; ++match) | |
384 | { | |
385 | *word = w_addchar (*word, word_length, max_length, ' '); | |
386 | if (*word != NULL) | |
387 | *word = w_addstr (*word, word_length, max_length, | |
388 | globbuf.gl_pathv[match]); | |
389 | } | |
390 | ||
391 | globfree (&globbuf); | |
392 | return *word ? 0 : WRDE_NOSPACE; | |
393 | } | |
394 | ||
395 | assert (ifs == NULL || *ifs != '\0'); | |
396 | if (*word != NULL) | |
397 | { | |
398 | free (*word); | |
399 | *word = w_newword (word_length, max_length); | |
400 | } | |
401 | ||
402 | for (match = 0; match < globbuf.gl_pathc; ++match) | |
403 | { | |
404 | char *matching_word = __strdup (globbuf.gl_pathv[match]); | |
405 | if (matching_word == NULL || w_addword (pwordexp, matching_word)) | |
406 | { | |
407 | globfree (&globbuf); | |
408 | return WRDE_NOSPACE; | |
409 | } | |
410 | } | |
411 | ||
412 | globfree (&globbuf); | |
413 | return 0; | |
414 | } | |
415 | ||
8f2ece69 | 416 | static int |
dfd2257a | 417 | internal_function |
40a55d20 UD |
418 | parse_glob (char **word, size_t *word_length, size_t *max_length, |
419 | const char *words, size_t *offset, int flags, | |
af69217f | 420 | wordexp_t *pwordexp, const char *ifs, const char *ifs_white) |
8f2ece69 | 421 | { |
2bcf29ba | 422 | /* We are poised just after a '*', a '[' or a '?'. */ |
e9fc7bbb | 423 | int error = WRDE_NOSPACE; |
2bcf29ba | 424 | int quoted = 0; /* 1 if singly-quoted, 2 if doubly */ |
e9fc7bbb UD |
425 | int i; |
426 | wordexp_t glob_list; /* List of words to glob */ | |
8f2ece69 | 427 | |
e9fc7bbb UD |
428 | glob_list.we_wordc = 0; |
429 | glob_list.we_wordv = NULL; | |
430 | glob_list.we_offs = 0; | |
431 | for (; words[*offset] != '\0'; ++*offset) | |
2bcf29ba | 432 | { |
9b3c7c3c UD |
433 | if ((ifs && strchr (ifs, words[*offset])) || |
434 | (!ifs && strchr (" \t\n", words[*offset]))) | |
435 | /* Reached IFS */ | |
8f2ece69 UD |
436 | break; |
437 | ||
2bcf29ba UD |
438 | /* Sort out quoting */ |
439 | if (words[*offset] == '\'') | |
6e4c40ba | 440 | { |
2bcf29ba UD |
441 | if (quoted == 0) |
442 | { | |
443 | quoted = 1; | |
444 | continue; | |
445 | } | |
446 | else if (quoted == 1) | |
447 | { | |
448 | quoted = 0; | |
449 | continue; | |
450 | } | |
6e4c40ba | 451 | } |
2bcf29ba | 452 | else if (words[*offset] == '"') |
6e4c40ba UD |
453 | { |
454 | if (quoted == 0) | |
455 | { | |
456 | quoted = 2; | |
457 | continue; | |
458 | } | |
459 | else if (quoted == 2) | |
460 | { | |
461 | quoted = 0; | |
462 | continue; | |
463 | } | |
464 | } | |
8f2ece69 | 465 | |
2bcf29ba UD |
466 | /* Sort out other special characters */ |
467 | if (quoted != 1 && words[*offset] == '$') | |
468 | { | |
e9fc7bbb UD |
469 | error = parse_dollars (word, word_length, max_length, words, |
470 | offset, flags, &glob_list, ifs, ifs_white, | |
9b3c7c3c | 471 | quoted == 2); |
2bcf29ba | 472 | if (error) |
e9fc7bbb | 473 | goto tidy_up; |
2bcf29ba UD |
474 | |
475 | continue; | |
476 | } | |
477 | else if (words[*offset] == '\\') | |
478 | { | |
479 | if (quoted) | |
e9fc7bbb UD |
480 | error = parse_qtd_backslash (word, word_length, max_length, |
481 | words, offset); | |
2bcf29ba | 482 | else |
e9fc7bbb UD |
483 | error = parse_backslash (word, word_length, max_length, |
484 | words, offset); | |
2bcf29ba UD |
485 | |
486 | if (error) | |
e9fc7bbb | 487 | goto tidy_up; |
2bcf29ba UD |
488 | |
489 | continue; | |
490 | } | |
491 | ||
492 | *word = w_addchar (*word, word_length, max_length, words[*offset]); | |
493 | if (*word == NULL) | |
e9fc7bbb | 494 | goto tidy_up; |
2bcf29ba | 495 | } |
8f2ece69 | 496 | |
e9fc7bbb UD |
497 | /* Don't forget to re-parse the character we stopped at. */ |
498 | --*offset; | |
8f2ece69 | 499 | |
e9fc7bbb | 500 | /* Glob the words */ |
9b3c7c3c | 501 | error = w_addword (&glob_list, *word); |
e9fc7bbb UD |
502 | *word = w_newword (word_length, max_length); |
503 | for (i = 0; error == 0 && i < glob_list.we_wordc; i++) | |
504 | error = do_parse_glob (glob_list.we_wordv[i], word, word_length, | |
505 | max_length, pwordexp, ifs, ifs_white); | |
8f2ece69 | 506 | |
e9fc7bbb UD |
507 | /* Now tidy up */ |
508 | tidy_up: | |
509 | wordfree (&glob_list); | |
510 | return error; | |
8f2ece69 UD |
511 | } |
512 | ||
513 | static int | |
3db52d94 | 514 | internal_function |
40a55d20 UD |
515 | parse_squote (char **word, size_t *word_length, size_t *max_length, |
516 | const char *words, size_t *offset) | |
8f2ece69 UD |
517 | { |
518 | /* We are poised just after a single quote */ | |
519 | for (; words[*offset]; ++(*offset)) | |
520 | { | |
521 | if (words[*offset] != '\'') | |
522 | { | |
40a55d20 | 523 | *word = w_addchar (*word, word_length, max_length, words[*offset]); |
8f2ece69 UD |
524 | if (*word == NULL) |
525 | return WRDE_NOSPACE; | |
526 | } | |
527 | else return 0; | |
528 | } | |
529 | ||
530 | /* Unterminated string */ | |
531 | return WRDE_SYNTAX; | |
532 | } | |
533 | ||
534 | /* Functions to evaluate an arithmetic expression */ | |
535 | static int | |
dfd2257a | 536 | internal_function |
3db52d94 | 537 | eval_expr_val (char **expr, long int *result) |
28f540f4 | 538 | { |
8f2ece69 UD |
539 | int sgn = +1; |
540 | char *digit; | |
541 | ||
542 | /* Skip white space */ | |
543 | for (digit = *expr; digit && *digit && isspace (*digit); ++digit); | |
544 | ||
545 | switch (*digit) | |
546 | { | |
547 | case '(': | |
548 | ||
549 | /* Scan for closing paren */ | |
550 | for (++digit; **expr && **expr != ')'; ++(*expr)); | |
551 | ||
552 | /* Is there one? */ | |
553 | if (!**expr) | |
554 | return WRDE_SYNTAX; | |
555 | ||
556 | *(*expr)++ = 0; | |
557 | ||
40a55d20 | 558 | if (eval_expr (digit, result)) |
8f2ece69 UD |
559 | return WRDE_SYNTAX; |
560 | ||
561 | return 0; | |
562 | ||
563 | case '+': /* Positive value */ | |
564 | ++digit; | |
565 | break; | |
566 | ||
567 | case '-': /* Negative value */ | |
568 | ++digit; | |
569 | sgn = -1; | |
570 | break; | |
571 | ||
572 | default: | |
573 | if (!isdigit (*digit)) | |
574 | return WRDE_SYNTAX; | |
575 | } | |
576 | ||
577 | *result = 0; | |
40a55d20 | 578 | for (; *digit && isdigit (*digit); ++digit) |
8f2ece69 UD |
579 | *result = (*result * 10) + (*digit - '0'); |
580 | ||
581 | *expr = digit; | |
582 | *result *= sgn; | |
583 | return 0; | |
584 | } | |
585 | ||
586 | static int | |
dfd2257a | 587 | internal_function |
3db52d94 | 588 | eval_expr_multdiv (char **expr, long int *result) |
8f2ece69 | 589 | { |
3db52d94 | 590 | long int arg; |
8f2ece69 UD |
591 | |
592 | /* Read a Value */ | |
3db52d94 | 593 | if (eval_expr_val (expr, result) != 0) |
8f2ece69 UD |
594 | return WRDE_SYNTAX; |
595 | ||
596 | while (**expr) | |
597 | { | |
598 | /* Skip white space */ | |
599 | for (; *expr && **expr && isspace (**expr); ++(*expr)); | |
600 | ||
601 | if (**expr == '*') | |
602 | { | |
3db52d94 UD |
603 | ++(*expr); |
604 | if (eval_expr_val (expr, &arg) != 0) | |
8f2ece69 UD |
605 | return WRDE_SYNTAX; |
606 | ||
607 | *result *= arg; | |
608 | } | |
609 | else if (**expr == '/') | |
610 | { | |
3db52d94 UD |
611 | ++(*expr); |
612 | if (eval_expr_val (expr, &arg) != 0) | |
8f2ece69 UD |
613 | return WRDE_SYNTAX; |
614 | ||
615 | *result /= arg; | |
616 | } | |
617 | else break; | |
618 | } | |
619 | ||
620 | return 0; | |
621 | } | |
622 | ||
623 | static int | |
dfd2257a | 624 | internal_function |
3db52d94 | 625 | eval_expr (char *expr, long int *result) |
8f2ece69 | 626 | { |
3db52d94 | 627 | long int arg; |
8f2ece69 UD |
628 | |
629 | /* Read a Multdiv */ | |
3db52d94 | 630 | if (eval_expr_multdiv (&expr, result) != 0) |
8f2ece69 UD |
631 | return WRDE_SYNTAX; |
632 | ||
633 | while (*expr) | |
634 | { | |
635 | /* Skip white space */ | |
636 | for (; expr && *expr && isspace (*expr); ++expr); | |
637 | ||
638 | if (*expr == '+') | |
639 | { | |
3db52d94 UD |
640 | ++expr; |
641 | if (eval_expr_multdiv (&expr, &arg) != 0) | |
8f2ece69 UD |
642 | return WRDE_SYNTAX; |
643 | ||
644 | *result += arg; | |
645 | } | |
646 | else if (*expr == '-') | |
647 | { | |
3db52d94 UD |
648 | ++expr; |
649 | if (eval_expr_multdiv (&expr, &arg) != 0) | |
8f2ece69 UD |
650 | return WRDE_SYNTAX; |
651 | ||
652 | *result -= arg; | |
653 | } | |
654 | else break; | |
655 | } | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | static int | |
dfd2257a | 661 | internal_function |
40a55d20 UD |
662 | parse_arith (char **word, size_t *word_length, size_t *max_length, |
663 | const char *words, size_t *offset, int flags, int bracket) | |
8f2ece69 UD |
664 | { |
665 | /* We are poised just after "$((" or "$[" */ | |
28f540f4 | 666 | int error; |
8f2ece69 | 667 | int paren_depth = 1; |
e9fc7bbb UD |
668 | size_t expr_length; |
669 | size_t expr_maxlen; | |
670 | char *expr; | |
8f2ece69 | 671 | |
e9fc7bbb | 672 | expr = w_newword (&expr_length, &expr_maxlen); |
8f2ece69 UD |
673 | for (; words[*offset]; ++(*offset)) |
674 | { | |
675 | switch (words[*offset]) | |
676 | { | |
677 | case '$': | |
40a55d20 | 678 | error = parse_dollars (&expr, &expr_length, &expr_maxlen, |
9b3c7c3c | 679 | words, offset, flags, NULL, NULL, NULL, 1); |
2bcf29ba | 680 | /* The ``1'' here is to tell parse_dollars not to |
8f2ece69 UD |
681 | * split the fields. |
682 | */ | |
683 | if (error) | |
684 | { | |
685 | free (expr); | |
686 | return error; | |
687 | } | |
688 | break; | |
689 | ||
690 | case '`': | |
691 | (*offset)++; | |
40a55d20 | 692 | error = parse_backtick (&expr, &expr_length, &expr_maxlen, |
af69217f UD |
693 | words, offset, flags, NULL, NULL, NULL); |
694 | /* The first NULL here is to tell parse_backtick not to | |
8f2ece69 UD |
695 | * split the fields. |
696 | */ | |
697 | if (error) | |
698 | { | |
699 | free (expr); | |
700 | return error; | |
701 | } | |
702 | break; | |
703 | ||
704 | case '\\': | |
40a55d20 UD |
705 | error = parse_qtd_backslash (&expr, &expr_length, &expr_maxlen, |
706 | words, offset); | |
8f2ece69 UD |
707 | if (error) |
708 | { | |
709 | free (expr); | |
710 | return error; | |
711 | } | |
712 | /* I think that a backslash within an | |
713 | * arithmetic expansion is bound to | |
714 | * cause an error sooner or later anyway though. | |
715 | */ | |
716 | break; | |
717 | ||
718 | case ')': | |
719 | if (--paren_depth == 0) | |
720 | { | |
86187531 | 721 | char result[21]; /* 21 = ceil(log10(2^64)) + 1 */ |
3db52d94 UD |
722 | long int numresult = 0; |
723 | long long int convertme; | |
8f2ece69 UD |
724 | |
725 | if (bracket || words[1 + *offset] != ')') | |
33c3e20e UD |
726 | { |
727 | free (expr); | |
728 | return WRDE_SYNTAX; | |
729 | } | |
8f2ece69 UD |
730 | |
731 | ++(*offset); | |
732 | ||
733 | /* Go - evaluate. */ | |
3db52d94 | 734 | if (*expr && eval_expr (expr, &numresult) != 0) |
33c3e20e UD |
735 | { |
736 | free (expr); | |
737 | return WRDE_SYNTAX; | |
738 | } | |
8f2ece69 | 739 | |
3db52d94 UD |
740 | if (numresult < 0) |
741 | { | |
742 | convertme = -numresult; | |
743 | *word = w_addchar (*word, word_length, max_length, '-'); | |
744 | if (!*word) | |
745 | { | |
746 | free (expr); | |
747 | return WRDE_NOSPACE; | |
748 | } | |
749 | } | |
750 | else | |
751 | convertme = numresult; | |
752 | ||
86187531 UD |
753 | result[20] = '\0'; |
754 | *word = w_addstr (*word, word_length, max_length, | |
3db52d94 | 755 | _itoa (convertme, &result[20], 10, 0)); |
8f2ece69 UD |
756 | free (expr); |
757 | return *word ? 0 : WRDE_NOSPACE; | |
758 | } | |
40a55d20 | 759 | expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]); |
8f2ece69 UD |
760 | if (expr == NULL) |
761 | return WRDE_NOSPACE; | |
762 | ||
763 | break; | |
764 | ||
765 | case ']': | |
766 | if (bracket && paren_depth == 1) | |
767 | { | |
86187531 | 768 | char result[21]; /* 21 = ceil(log10(2^64)) + 1 */ |
3db52d94 | 769 | long int numresult = 0; |
8f2ece69 UD |
770 | |
771 | /* Go - evaluate. */ | |
772 | if (*expr && eval_expr (expr, &numresult) != 0) | |
33c3e20e UD |
773 | { |
774 | free (expr); | |
775 | return WRDE_SYNTAX; | |
776 | } | |
8f2ece69 | 777 | |
86187531 UD |
778 | result[20] = '\0'; |
779 | *word = w_addstr (*word, word_length, max_length, | |
780 | _itoa_word (numresult, &result[20], 10, 0)); | |
8f2ece69 UD |
781 | free (expr); |
782 | return *word ? 0 : WRDE_NOSPACE; | |
783 | } | |
784 | ||
785 | free (expr); | |
786 | return WRDE_SYNTAX; | |
787 | ||
788 | case '\n': | |
789 | case ';': | |
790 | case '{': | |
791 | case '}': | |
792 | free (expr); | |
793 | return WRDE_BADCHAR; | |
794 | ||
795 | case '(': | |
796 | ++paren_depth; | |
797 | default: | |
40a55d20 | 798 | expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]); |
8f2ece69 UD |
799 | if (expr == NULL) |
800 | return WRDE_NOSPACE; | |
801 | } | |
802 | } | |
803 | ||
804 | /* Premature end */ | |
805 | free (expr); | |
806 | return WRDE_SYNTAX; | |
807 | } | |
808 | ||
809 | /* Function to execute a command and retrieve the results */ | |
810 | /* pwordexp contains NULL if field-splitting is forbidden */ | |
811 | static int | |
dfd2257a | 812 | internal_function |
40a55d20 | 813 | exec_comm (char *comm, char **word, size_t *word_length, size_t *max_length, |
af69217f UD |
814 | int flags, wordexp_t *pwordexp, const char *ifs, |
815 | const char *ifs_white) | |
8f2ece69 | 816 | { |
40a55d20 | 817 | int fildes[2]; |
8f2ece69 UD |
818 | int bufsize = 128; |
819 | int buflen; | |
9b3c7c3c | 820 | int i; |
55c14926 | 821 | char *buffer; |
28f540f4 | 822 | pid_t pid; |
28f540f4 | 823 | |
8f2ece69 UD |
824 | /* Don't fork() unless necessary */ |
825 | if (!comm || !*comm) | |
826 | return 0; | |
28f540f4 | 827 | |
50304ef0 | 828 | if (__pipe (fildes)) |
8f2ece69 UD |
829 | /* Bad */ |
830 | return WRDE_NOSPACE; | |
28f540f4 | 831 | |
50304ef0 | 832 | if ((pid = __fork ()) < 0) |
8f2ece69 UD |
833 | { |
834 | /* Bad */ | |
33c3e20e UD |
835 | __close (fildes[0]); |
836 | __close (fildes[1]); | |
8f2ece69 UD |
837 | return WRDE_NOSPACE; |
838 | } | |
28f540f4 RM |
839 | |
840 | if (pid == 0) | |
841 | { | |
8f2ece69 | 842 | /* Child */ |
86187531 UD |
843 | const char *args[4] = { _PATH_BSHELL, "-c", comm, NULL }; |
844 | ||
22bc7978 | 845 | /* Redirect output. */ |
50304ef0 UD |
846 | __dup2 (fildes[1], 1); |
847 | __close (fildes[1]); | |
28f540f4 | 848 | |
22bc7978 | 849 | /* Redirect stderr to /dev/null if we have to. */ |
8f2ece69 | 850 | if ((flags & WRDE_SHOWERR) == 0) |
22bc7978 UD |
851 | { |
852 | int fd; | |
50304ef0 UD |
853 | __close (2); |
854 | fd = __open (_PATH_DEVNULL, O_WRONLY); | |
22bc7978 UD |
855 | if (fd >= 0 && fd != 2) |
856 | { | |
50304ef0 UD |
857 | __dup2 (fd, 2); |
858 | __close (fd); | |
22bc7978 UD |
859 | } |
860 | } | |
28f540f4 | 861 | |
50304ef0 | 862 | __close (fildes[0]); |
86187531 | 863 | __execve (_PATH_BSHELL, (char *const *) args, __environ); |
40a55d20 | 864 | |
86187531 UD |
865 | /* Bad. What now? */ |
866 | abort (); | |
8f2ece69 | 867 | } |
28f540f4 | 868 | |
8f2ece69 UD |
869 | /* Parent */ |
870 | ||
50304ef0 | 871 | __close (fildes[1]); |
8f2ece69 | 872 | buffer = __alloca (bufsize); |
28f540f4 | 873 | |
9b3c7c3c UD |
874 | if (!pwordexp) |
875 | { /* Quoted - no field splitting */ | |
876 | ||
877 | while (1) | |
8f2ece69 | 878 | { |
50304ef0 | 879 | if ((buflen = __read (fildes[0], buffer, bufsize)) < 1) |
9b3c7c3c UD |
880 | { |
881 | if (__waitpid (pid, NULL, WNOHANG) == 0) | |
882 | continue; | |
883 | if ((buflen = __read (fildes[0], buffer, bufsize)) < 1) | |
884 | break; | |
885 | } | |
886 | ||
887 | *word = w_addmem (*word, word_length, max_length, buffer, buflen); | |
888 | if (*word == NULL) | |
889 | goto no_space; | |
8f2ece69 | 890 | } |
9b3c7c3c UD |
891 | } |
892 | else | |
893 | /* Not quoted - split fields */ | |
894 | { | |
895 | int copying = 0; | |
896 | /* 'copying' is: | |
897 | * 0 when searching for first character in a field not IFS white space | |
898 | * 1 when copying the text of a field | |
899 | * 2 when searching for possible non-whitespace IFS | |
900 | */ | |
901 | ||
902 | while (1) | |
903 | { | |
904 | if ((buflen = __read (fildes[0], buffer, bufsize)) < 1) | |
905 | { | |
906 | if (__waitpid (pid, NULL, WNOHANG) == 0) | |
907 | continue; | |
908 | if ((__read (fildes[0], buffer, bufsize)) < 1) | |
909 | break; | |
910 | } | |
a8125d85 | 911 | |
9b3c7c3c UD |
912 | for (i = 0; i < buflen; ++i) |
913 | { | |
914 | if (strchr (ifs, buffer[i]) != NULL) | |
915 | { | |
916 | /* Current character is IFS */ | |
917 | if (strchr (ifs_white, buffer[i]) == NULL) | |
918 | { | |
919 | /* Current character is IFS but not whitespace */ | |
920 | if (copying == 2) | |
921 | { | |
922 | /* current character | |
923 | * | | |
924 | * V | |
925 | * eg: text<space><comma><space>moretext | |
926 | * | |
927 | * So, strip whitespace IFS (like at the start) | |
928 | */ | |
929 | copying = 0; | |
930 | continue; | |
931 | } | |
932 | ||
933 | copying = 0; | |
934 | /* fall through and delimit field.. */ | |
935 | } | |
936 | else | |
937 | { | |
938 | /* Current character is IFS white space */ | |
939 | ||
940 | /* If not copying a field, ignore it */ | |
941 | if (copying != 1) | |
942 | continue; | |
943 | ||
944 | /* End of field (search for non-ws IFS afterwards) */ | |
945 | copying = 2; | |
946 | } | |
947 | ||
948 | /* First IFS white space, or IFS non-whitespace. | |
949 | * Delimit the field. Nulls are converted by w_addword. */ | |
950 | if (w_addword (pwordexp, *word) == WRDE_NOSPACE) | |
951 | goto no_space; | |
952 | ||
953 | *word = w_newword (word_length, max_length); | |
954 | /* fall back round the loop.. */ | |
955 | } | |
956 | else | |
957 | { | |
958 | /* Not IFS character */ | |
959 | copying = 1; | |
960 | ||
961 | *word = w_addchar (*word, word_length, max_length, | |
962 | buffer[i]); | |
963 | if (*word == NULL) | |
964 | goto no_space; | |
965 | } | |
966 | } | |
967 | } | |
8f2ece69 | 968 | } |
28f540f4 | 969 | |
22bc7978 UD |
970 | /* Bash chops off trailing newlines, which seems sensible. */ |
971 | while (*word_length > 0 && (*word)[*word_length - 1] == '\n') | |
1720f4d0 UD |
972 | { |
973 | (*word)[--*word_length] = '\0'; | |
974 | ||
1ffaaca2 | 975 | /* If the last word was entirely newlines, turn it into a new word |
1720f4d0 | 976 | * which can be ignored if there's nothing following it. */ |
1ffaaca2 | 977 | if (*word_length == 0) |
1720f4d0 UD |
978 | { |
979 | free (*word); | |
980 | *word = w_newword (word_length, max_length); | |
1ffaaca2 | 981 | break; |
1720f4d0 UD |
982 | } |
983 | } | |
22bc7978 | 984 | |
50304ef0 | 985 | __close (fildes[0]); |
8f2ece69 | 986 | return 0; |
33c3e20e UD |
987 | |
988 | no_space: | |
989 | __kill (pid, SIGKILL); | |
990 | __waitpid (pid, NULL, 0); | |
991 | __close (fildes[0]); | |
992 | return WRDE_NOSPACE; | |
8f2ece69 UD |
993 | } |
994 | ||
995 | static int | |
3db52d94 | 996 | internal_function |
40a55d20 | 997 | parse_comm (char **word, size_t *word_length, size_t *max_length, |
af69217f UD |
998 | const char *words, size_t *offset, int flags, wordexp_t *pwordexp, |
999 | const char *ifs, const char *ifs_white) | |
8f2ece69 UD |
1000 | { |
1001 | /* We are poised just after "$(" */ | |
1002 | int paren_depth = 1; | |
3c20b9b6 | 1003 | int error = 0; |
3c20b9b6 | 1004 | int quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */ |
e9fc7bbb UD |
1005 | size_t comm_length; |
1006 | size_t comm_maxlen; | |
1007 | char *comm = w_newword (&comm_length, &comm_maxlen); | |
8f2ece69 UD |
1008 | |
1009 | for (; words[*offset]; ++(*offset)) | |
28f540f4 | 1010 | { |
8f2ece69 | 1011 | switch (words[*offset]) |
28f540f4 | 1012 | { |
3c20b9b6 UD |
1013 | case '\'': |
1014 | if (quoted == 0) | |
1015 | quoted = 1; | |
1016 | else if (quoted == 1) | |
1017 | quoted = 0; | |
1018 | ||
1019 | break; | |
1020 | ||
1021 | case '"': | |
1022 | if (quoted == 0) | |
1023 | quoted = 2; | |
1024 | else if (quoted == 2) | |
1025 | quoted = 0; | |
1026 | ||
1027 | break; | |
1028 | ||
8f2ece69 | 1029 | case ')': |
3c20b9b6 | 1030 | if (!quoted && --paren_depth == 0) |
8f2ece69 UD |
1031 | { |
1032 | /* Go -- give script to the shell */ | |
3c20b9b6 UD |
1033 | if (comm) |
1034 | { | |
1035 | error = exec_comm (comm, word, word_length, max_length, | |
1036 | flags, pwordexp, ifs, ifs_white); | |
1037 | free (comm); | |
1038 | } | |
1039 | ||
8f2ece69 UD |
1040 | return error; |
1041 | } | |
1042 | ||
1043 | /* This is just part of the script */ | |
8f2ece69 UD |
1044 | break; |
1045 | ||
1046 | case '(': | |
3c20b9b6 UD |
1047 | if (!quoted) |
1048 | ++paren_depth; | |
28f540f4 | 1049 | } |
3c20b9b6 UD |
1050 | |
1051 | comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]); | |
1052 | if (comm == NULL) | |
1053 | return WRDE_NOSPACE; | |
28f540f4 | 1054 | } |
28f540f4 | 1055 | |
8f2ece69 | 1056 | /* Premature end */ |
3c20b9b6 UD |
1057 | if (comm) |
1058 | free (comm); | |
1059 | ||
8f2ece69 UD |
1060 | return WRDE_SYNTAX; |
1061 | } | |
28f540f4 | 1062 | |
8f2ece69 | 1063 | static int |
dfd2257a | 1064 | internal_function |
40a55d20 | 1065 | parse_param (char **word, size_t *word_length, size_t *max_length, |
af69217f | 1066 | const char *words, size_t *offset, int flags, wordexp_t *pwordexp, |
2bcf29ba | 1067 | const char *ifs, const char *ifs_white, int quoted) |
8f2ece69 UD |
1068 | { |
1069 | /* We are poised just after "$" */ | |
3c20b9b6 | 1070 | enum action |
af6f3906 | 1071 | { |
3c20b9b6 UD |
1072 | ACT_NONE, |
1073 | ACT_RP_SHORT_LEFT = '#', | |
1074 | ACT_RP_LONG_LEFT = 'L', | |
1075 | ACT_RP_SHORT_RIGHT = '%', | |
1076 | ACT_RP_LONG_RIGHT = 'R', | |
1077 | ACT_NULL_ERROR = '?', | |
1078 | ACT_NULL_SUBST = '-', | |
1079 | ACT_NONNULL_SUBST = '+', | |
1080 | ACT_NULL_ASSIGN = '=' | |
af6f3906 | 1081 | }; |
e9fc7bbb UD |
1082 | size_t env_length; |
1083 | size_t env_maxlen; | |
1084 | size_t pat_length; | |
1085 | size_t pat_maxlen; | |
3c20b9b6 | 1086 | size_t start = *offset; |
e9fc7bbb UD |
1087 | char *env; |
1088 | char *pattern; | |
2bcf29ba | 1089 | char *value = NULL; |
3c20b9b6 | 1090 | enum action action = ACT_NONE; |
8f2ece69 | 1091 | int depth = 0; |
3c20b9b6 | 1092 | int colon_seen = 0; |
14c44e2e | 1093 | int seen_hash = 0; |
76fbcfdd | 1094 | int free_value = 0; |
3c20b9b6 | 1095 | int pattern_is_quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */ |
8f2ece69 | 1096 | int error; |
1f4a9ebd UD |
1097 | int special = 0; |
1098 | char buffer[21]; | |
3c20b9b6 UD |
1099 | int brace = words[*offset] == '{'; |
1100 | ||
e9fc7bbb UD |
1101 | env = w_newword (&env_length, &env_maxlen); |
1102 | pattern = w_newword (&pat_length, &pat_maxlen); | |
1103 | ||
3c20b9b6 UD |
1104 | if (brace) |
1105 | ++*offset; | |
8f2ece69 | 1106 | |
1f4a9ebd UD |
1107 | /* First collect the parameter name. */ |
1108 | ||
1109 | if (words[*offset] == '#') | |
8f2ece69 | 1110 | { |
1f4a9ebd UD |
1111 | seen_hash = 1; |
1112 | if (!brace) | |
1113 | goto envsubst; | |
1114 | ++*offset; | |
1115 | } | |
af6f3906 | 1116 | |
1f4a9ebd UD |
1117 | if (isalpha (words[*offset]) || words[*offset] == '_') |
1118 | { | |
1119 | /* Normal parameter name. */ | |
1120 | do | |
1121 | { | |
1122 | env = w_addchar (env, &env_length, &env_maxlen, | |
1123 | words[*offset]); | |
1124 | if (env == NULL) | |
1125 | goto no_space; | |
1126 | } | |
1127 | while (isalnum (words[++*offset]) || words[*offset] == '_'); | |
1128 | } | |
1129 | else if (isdigit (words[*offset])) | |
1130 | { | |
1131 | /* Numeric parameter name. */ | |
1132 | special = 1; | |
1133 | do | |
1134 | { | |
1135 | env = w_addchar (env, &env_length, &env_maxlen, | |
1136 | words[*offset]); | |
1137 | if (env == NULL) | |
1138 | goto no_space; | |
1139 | if (!brace) | |
1140 | goto envsubst; | |
1141 | } | |
1142 | while (isdigit(words[++*offset])); | |
1143 | } | |
1144 | else if (strchr ("*@$", words[*offset]) != NULL) | |
1145 | { | |
1146 | /* Special parameter. */ | |
1147 | special = 1; | |
1148 | env = w_addchar (env, &env_length, &env_maxlen, | |
1149 | words[*offset]); | |
1150 | if (env == NULL) | |
1151 | goto no_space; | |
1152 | ++*offset; | |
1153 | } | |
1154 | else | |
1155 | { | |
1156 | if (brace) | |
1157 | goto syntax; | |
1158 | } | |
1159 | ||
1160 | if (brace) | |
1161 | { | |
1162 | /* Check for special action to be applied to the value. */ | |
1163 | switch (words[*offset]) | |
1164 | { | |
1165 | case '}': | |
68b50604 | 1166 | /* Evaluate. */ |
1f4a9ebd UD |
1167 | goto envsubst; |
1168 | ||
1169 | case '#': | |
1170 | action = ACT_RP_SHORT_LEFT; | |
1171 | if (words[1 + *offset] == '#') | |
1172 | { | |
1173 | ++*offset; | |
1174 | action = ACT_RP_LONG_LEFT; | |
1175 | } | |
1176 | break; | |
1177 | ||
1178 | case '%': | |
1179 | action = ACT_RP_SHORT_RIGHT; | |
1180 | if (words[1 + *offset] == '%') | |
1181 | { | |
1182 | ++*offset; | |
1183 | action = ACT_RP_LONG_RIGHT; | |
1184 | } | |
1185 | break; | |
1186 | ||
1187 | case ':': | |
1188 | if (strchr ("-=?+", words[1 + *offset]) == NULL) | |
1189 | goto syntax; | |
1190 | ||
1191 | colon_seen = 1; | |
1192 | action = words[++*offset]; | |
1193 | break; | |
1194 | ||
1195 | case '-': | |
1196 | case '=': | |
1197 | case '?': | |
1198 | case '+': | |
1199 | action = words[*offset]; | |
1200 | break; | |
1201 | ||
1202 | default: | |
1203 | goto syntax; | |
1204 | } | |
1205 | ||
1206 | /* Now collect the pattern. */ | |
1207 | ++*offset; | |
1208 | for (; words[*offset]; ++(*offset)) | |
3c20b9b6 UD |
1209 | { |
1210 | switch (words[*offset]) | |
8f2ece69 | 1211 | { |
3c20b9b6 UD |
1212 | case '{': |
1213 | if (!pattern_is_quoted) | |
1214 | ++depth; | |
1215 | break; | |
8f2ece69 | 1216 | |
3c20b9b6 UD |
1217 | case '}': |
1218 | if (!pattern_is_quoted) | |
1219 | { | |
1220 | if (depth == 0) | |
1221 | goto envsubst; | |
1222 | --depth; | |
1223 | } | |
8f2ece69 | 1224 | break; |
8f2ece69 | 1225 | |
3c20b9b6 UD |
1226 | case '\\': |
1227 | if (!pattern_is_quoted && words[++*offset] == '\0') | |
1228 | goto syntax; | |
1229 | break; | |
af6f3906 | 1230 | |
3c20b9b6 UD |
1231 | case '\'': |
1232 | if (pattern_is_quoted == 0) | |
1233 | pattern_is_quoted = 1; | |
1234 | else if (pattern_is_quoted == 1) | |
1235 | pattern_is_quoted = 0; | |
8f2ece69 | 1236 | |
3c20b9b6 | 1237 | break; |
8f2ece69 | 1238 | |
3c20b9b6 UD |
1239 | case '"': |
1240 | if (pattern_is_quoted == 0) | |
1241 | pattern_is_quoted = 2; | |
1242 | else if (pattern_is_quoted == 2) | |
1243 | pattern_is_quoted = 0; | |
8f2ece69 | 1244 | |
3c20b9b6 | 1245 | break; |
8f2ece69 UD |
1246 | } |
1247 | ||
3c20b9b6 UD |
1248 | pattern = w_addchar (pattern, &pat_length, &pat_maxlen, |
1249 | words[*offset]); | |
1250 | if (pattern == NULL) | |
1251 | goto no_space; | |
8f2ece69 UD |
1252 | } |
1253 | } | |
1254 | ||
1f4a9ebd UD |
1255 | /* End of input string -- remember to reparse the character that we |
1256 | * stopped at. */ | |
8f2ece69 UD |
1257 | --(*offset); |
1258 | ||
1259 | envsubst: | |
1260 | if (words[start] == '{' && words[*offset] != '}') | |
af6f3906 | 1261 | goto syntax; |
8f2ece69 | 1262 | |
1f4a9ebd | 1263 | if (env == NULL) |
8f2ece69 | 1264 | { |
14c44e2e UD |
1265 | if (seen_hash) |
1266 | { | |
1267 | /* $# expands to the number of positional parameters */ | |
14c44e2e | 1268 | buffer[20] = '\0'; |
1f4a9ebd UD |
1269 | value = _itoa_word (__libc_argc - 1, &buffer[20], 10, 0); |
1270 | seen_hash = 0; | |
14c44e2e UD |
1271 | } |
1272 | else | |
1273 | { | |
1274 | /* Just $ on its own */ | |
1275 | *offset = start - 1; | |
1276 | *word = w_addchar (*word, word_length, max_length, '$'); | |
1f4a9ebd | 1277 | return *word ? 0 : WRDE_NOSPACE; |
14c44e2e | 1278 | } |
8f2ece69 | 1279 | } |
e9fc7bbb | 1280 | /* Is it a numeric parameter? */ |
1f4a9ebd UD |
1281 | else if (isdigit (env[0])) |
1282 | { | |
1283 | int n = atoi (env); | |
8f2ece69 | 1284 | |
1f4a9ebd UD |
1285 | if (n >= __libc_argc) |
1286 | /* Substitute NULL. */ | |
1287 | value = NULL; | |
1288 | else | |
1289 | /* Replace with appropriate positional parameter. */ | |
1290 | value = __libc_argv[n]; | |
1291 | } | |
14c44e2e | 1292 | /* Is it a special parameter? */ |
1f4a9ebd | 1293 | else if (special) |
2bcf29ba | 1294 | { |
1f4a9ebd UD |
1295 | /* Is it `$$'? */ |
1296 | if (*env == '$') | |
14c44e2e | 1297 | { |
1f4a9ebd | 1298 | buffer[20] = '\0'; |
50304ef0 | 1299 | value = _itoa_word (__getpid (), &buffer[20], 10, 0); |
14c44e2e | 1300 | } |
1f4a9ebd UD |
1301 | /* Is it `${#*}' or `${#@}'? */ |
1302 | else if ((*env == '*' || *env == '@') && seen_hash) | |
2bcf29ba | 1303 | { |
1f4a9ebd UD |
1304 | buffer[20] = '\0'; |
1305 | value = _itoa_word (__libc_argc > 0 ? __libc_argc - 1 : 0, | |
1306 | &buffer[20], 10, 0); | |
1307 | *word = w_addstr (*word, word_length, max_length, value); | |
14c44e2e | 1308 | free (env); |
33c3e20e UD |
1309 | if (pattern) |
1310 | free (pattern); | |
14c44e2e UD |
1311 | return *word ? 0 : WRDE_NOSPACE; |
1312 | } | |
1313 | /* Is it `$*' or `$@' (unquoted) ? */ | |
1314 | else if (*env == '*' || (*env == '@' && !quoted)) | |
1315 | { | |
68b50604 | 1316 | size_t plist_len = 0; |
14c44e2e | 1317 | int p; |
68b50604 | 1318 | char *end; |
14c44e2e | 1319 | |
2bcf29ba | 1320 | /* Build up value parameter by parameter (copy them) */ |
68b50604 UD |
1321 | for (p = 1; __libc_argv[p]; ++p) |
1322 | plist_len += strlen (__libc_argv[p]) + 1; /* for space */ | |
1323 | value = malloc (plist_len); | |
1324 | if (value == NULL) | |
1325 | goto no_space; | |
1326 | end = value; | |
1327 | *end = 0; | |
8d9618b7 | 1328 | for (p = 1; __libc_argv[p]; ++p) |
2bcf29ba | 1329 | { |
68b50604 UD |
1330 | if (p > 1) |
1331 | *end++ = ' '; | |
1332 | end = __stpcpy (end, __libc_argv[p]); | |
2bcf29ba UD |
1333 | } |
1334 | ||
76fbcfdd | 1335 | free_value = 1; |
2bcf29ba | 1336 | } |
1f4a9ebd UD |
1337 | else |
1338 | { | |
1339 | /* Must be a quoted `$@' */ | |
1340 | assert (*env == '@' && quoted); | |
2bcf29ba | 1341 | |
1f4a9ebd UD |
1342 | /* Each parameter is a separate word ("$@") */ |
1343 | if (__libc_argc == 2) | |
68b50604 | 1344 | value = __libc_argv[1]; |
1f4a9ebd UD |
1345 | else if (__libc_argc > 2) |
1346 | { | |
1347 | int p; | |
14c44e2e | 1348 | |
1f4a9ebd UD |
1349 | /* Append first parameter to current word. */ |
1350 | value = w_addstr (*word, word_length, max_length, | |
1351 | __libc_argv[1]); | |
1352 | if (value == NULL || w_addword (pwordexp, value)) | |
1353 | goto no_space; | |
14c44e2e | 1354 | |
1f4a9ebd UD |
1355 | for (p = 2; __libc_argv[p + 1]; p++) |
1356 | { | |
1357 | char *newword = __strdup (__libc_argv[p]); | |
1358 | if (newword == NULL || w_addword (pwordexp, newword)) | |
1359 | goto no_space; | |
1360 | } | |
2bcf29ba | 1361 | |
1f4a9ebd | 1362 | /* Start a new word with the last parameter. */ |
e9fc7bbb | 1363 | *word = w_newword (word_length, max_length); |
fdacb17d | 1364 | value = __libc_argv[p]; |
1f4a9ebd UD |
1365 | } |
1366 | else | |
2bcf29ba | 1367 | { |
1f4a9ebd UD |
1368 | free (env); |
1369 | free (pattern); | |
1370 | return 0; | |
2bcf29ba UD |
1371 | } |
1372 | } | |
2bcf29ba | 1373 | } |
1f4a9ebd | 1374 | else |
68b50604 UD |
1375 | value = getenv (env); |
1376 | ||
1377 | if (value == NULL && (flags & WRDE_UNDEF)) | |
1f4a9ebd | 1378 | { |
68b50604 | 1379 | /* Variable not defined. */ |
33c3e20e UD |
1380 | error = WRDE_BADVAL; |
1381 | goto do_error; | |
1f4a9ebd | 1382 | } |
8f2ece69 | 1383 | |
3c20b9b6 | 1384 | if (action != ACT_NONE) |
8f2ece69 UD |
1385 | { |
1386 | switch (action) | |
1387 | { | |
3c20b9b6 UD |
1388 | case ACT_RP_SHORT_LEFT: |
1389 | case ACT_RP_LONG_LEFT: | |
1390 | case ACT_RP_SHORT_RIGHT: | |
1391 | case ACT_RP_LONG_RIGHT: | |
af6f3906 UD |
1392 | { |
1393 | char *p; | |
1394 | char c; | |
1395 | char *end; | |
1396 | ||
1f4a9ebd | 1397 | if (value == NULL || pattern == NULL || *pattern == '\0') |
af6f3906 UD |
1398 | break; |
1399 | ||
1400 | end = value + strlen (value); | |
1401 | ||
3c20b9b6 | 1402 | switch (action) |
af6f3906 | 1403 | { |
3c20b9b6 | 1404 | case ACT_RP_SHORT_LEFT: |
3db52d94 | 1405 | for (p = value; p <= end; ++p) |
af6f3906 UD |
1406 | { |
1407 | c = *p; | |
1408 | *p = '\0'; | |
1409 | if (fnmatch (pattern, value, 0) != FNM_NOMATCH) | |
1410 | { | |
1411 | *p = c; | |
68b50604 UD |
1412 | if (free_value) |
1413 | { | |
1414 | char *newval = __strdup (p); | |
1415 | if (newval == NULL) | |
1416 | { | |
1417 | free (value); | |
1418 | goto no_space; | |
1419 | } | |
1420 | free (value); | |
1421 | value = newval; | |
1422 | } | |
1423 | else | |
1424 | value = p; | |
af6f3906 UD |
1425 | break; |
1426 | } | |
1427 | *p = c; | |
1428 | } | |
1429 | ||
1430 | break; | |
1431 | ||
3c20b9b6 | 1432 | case ACT_RP_LONG_LEFT: |
3db52d94 | 1433 | for (p = end; p >= value; --p) |
af6f3906 UD |
1434 | { |
1435 | c = *p; | |
1436 | *p = '\0'; | |
1437 | if (fnmatch (pattern, value, 0) != FNM_NOMATCH) | |
1438 | { | |
1439 | *p = c; | |
68b50604 UD |
1440 | if (free_value) |
1441 | { | |
1442 | char *newval = __strdup (p); | |
1443 | if (newval == NULL) | |
1444 | { | |
1445 | free (value); | |
1446 | goto no_space; | |
1447 | } | |
1448 | free (value); | |
1449 | value = newval; | |
1450 | } | |
1451 | else | |
1452 | value = p; | |
af6f3906 UD |
1453 | break; |
1454 | } | |
1455 | *p = c; | |
1456 | } | |
1457 | ||
1458 | break; | |
1459 | ||
3c20b9b6 | 1460 | case ACT_RP_SHORT_RIGHT: |
3db52d94 | 1461 | for (p = end; p >= value; --p) |
af6f3906 UD |
1462 | { |
1463 | if (fnmatch (pattern, p, 0) != FNM_NOMATCH) | |
1464 | { | |
1f4a9ebd UD |
1465 | char *newval; |
1466 | newval = malloc (p - value + 1); | |
33c3e20e | 1467 | |
1f4a9ebd | 1468 | if (newval == NULL) |
33c3e20e UD |
1469 | { |
1470 | if (free_value) | |
1471 | free (value); | |
1472 | goto no_space; | |
1473 | } | |
1474 | ||
1f4a9ebd UD |
1475 | *(char *) __mempcpy (newval, value, p - value) = '\0'; |
1476 | if (free_value) | |
1477 | free (value); | |
1478 | value = newval; | |
1479 | free_value = 1; | |
af6f3906 UD |
1480 | break; |
1481 | } | |
1482 | } | |
1483 | ||
1484 | break; | |
1485 | ||
3c20b9b6 | 1486 | case ACT_RP_LONG_RIGHT: |
3db52d94 | 1487 | for (p = value; p <= end; ++p) |
af6f3906 UD |
1488 | { |
1489 | if (fnmatch (pattern, p, 0) != FNM_NOMATCH) | |
1490 | { | |
1f4a9ebd UD |
1491 | char *newval; |
1492 | newval = malloc (p - value + 1); | |
33c3e20e | 1493 | |
1f4a9ebd | 1494 | if (newval == NULL) |
33c3e20e UD |
1495 | { |
1496 | if (free_value) | |
1497 | free (value); | |
1498 | goto no_space; | |
1499 | } | |
1500 | ||
1f4a9ebd UD |
1501 | *(char *) __mempcpy (newval, value, p - value) = '\0'; |
1502 | if (free_value) | |
1503 | free (value); | |
1504 | value = newval; | |
1505 | free_value = 1; | |
af6f3906 UD |
1506 | break; |
1507 | } | |
1508 | } | |
1509 | ||
1510 | break; | |
1511 | ||
1512 | default: | |
3c20b9b6 | 1513 | break; |
af6f3906 UD |
1514 | } |
1515 | ||
1516 | break; | |
1517 | } | |
8f2ece69 | 1518 | |
3c20b9b6 | 1519 | case ACT_NULL_ERROR: |
8f2ece69 | 1520 | if (value && *value) |
3db52d94 | 1521 | /* Substitute parameter */ |
8f2ece69 UD |
1522 | break; |
1523 | ||
1524 | if (!colon_seen && value) | |
1f4a9ebd UD |
1525 | /* Substitute NULL */ |
1526 | error = 0; | |
1527 | else if (*pattern) | |
8f2ece69 UD |
1528 | { |
1529 | /* Expand 'pattern' and write it to stderr */ | |
1530 | wordexp_t we; | |
1531 | ||
1532 | error = wordexp (pattern, &we, flags); | |
1533 | ||
1534 | if (error == 0) | |
1535 | { | |
1536 | int i; | |
1537 | ||
3c20b9b6 UD |
1538 | fprintf (stderr, "%s:", env); |
1539 | ||
8f2ece69 UD |
1540 | for (i = 0; i < we.we_wordc; ++i) |
1541 | { | |
3c20b9b6 | 1542 | fprintf (stderr, " %s", we.we_wordv[i]); |
8f2ece69 UD |
1543 | } |
1544 | ||
1545 | fprintf (stderr, "\n"); | |
1546 | error = WRDE_BADVAL; | |
1547 | } | |
1548 | ||
1549 | wordfree (&we); | |
1f4a9ebd UD |
1550 | } |
1551 | else | |
1552 | { | |
1553 | fprintf (stderr, "%s: parameter null or not set\n", env); | |
1554 | error = WRDE_BADVAL; | |
8f2ece69 UD |
1555 | } |
1556 | ||
68b50604 UD |
1557 | if (free_value) |
1558 | free (value); | |
33c3e20e | 1559 | goto do_error; |
8f2ece69 | 1560 | |
3c20b9b6 | 1561 | case ACT_NULL_SUBST: |
3db52d94 UD |
1562 | if (value && *value) |
1563 | /* Substitute parameter */ | |
1564 | break; | |
1565 | ||
1566 | if (!colon_seen && value) | |
1567 | { | |
1568 | /* Substitute NULL */ | |
68b50604 UD |
1569 | if (free_value) |
1570 | free (value); | |
33c3e20e | 1571 | goto success; |
3db52d94 UD |
1572 | } |
1573 | ||
1574 | subst_word: | |
1575 | { | |
1576 | /* Substitute word */ | |
1577 | wordexp_t we; | |
3db52d94 UD |
1578 | int i; |
1579 | ||
68b50604 UD |
1580 | if (free_value) |
1581 | free (value); | |
1582 | ||
2bcf29ba | 1583 | if (quoted) |
3db52d94 UD |
1584 | { |
1585 | /* No field-splitting is allowed, so imagine | |
1586 | quotes around the word. */ | |
2bcf29ba | 1587 | char *qtd_pattern = malloc (3 + strlen (pattern)); |
3c20b9b6 UD |
1588 | if (qtd_pattern) |
1589 | sprintf (qtd_pattern, "\"%s\"", pattern); | |
2bcf29ba UD |
1590 | free (pattern); |
1591 | pattern = qtd_pattern; | |
3db52d94 UD |
1592 | } |
1593 | ||
31161268 | 1594 | if (pattern == NULL && (pattern = __strdup ("")) == NULL) |
3c20b9b6 UD |
1595 | goto no_space; |
1596 | ||
2bcf29ba | 1597 | error = wordexp (pattern, &we, flags); |
3db52d94 | 1598 | if (error) |
33c3e20e | 1599 | goto do_error; |
3db52d94 UD |
1600 | |
1601 | /* Fingers crossed that the quotes worked.. */ | |
2bcf29ba | 1602 | assert (!quoted || we.we_wordc == 1); |
3db52d94 UD |
1603 | |
1604 | /* Substitute */ | |
31161268 | 1605 | for (i = 0; i < we.we_wordc; ++i) |
33c3e20e UD |
1606 | if ((error = w_addword (pwordexp, __strdup (we.we_wordv[i]))) |
1607 | != 0) | |
3db52d94 UD |
1608 | break; |
1609 | ||
8d9618b7 UD |
1610 | if (i < we.we_wordc) |
1611 | { | |
1612 | /* Ran out of space */ | |
1613 | wordfree (&we); | |
33c3e20e | 1614 | goto do_error; |
8d9618b7 UD |
1615 | } |
1616 | ||
3c20b9b6 | 1617 | if (action == ACT_NULL_ASSIGN) |
8d9618b7 UD |
1618 | { |
1619 | char *words; | |
1620 | char *cp; | |
1621 | size_t words_size = 0; | |
3db52d94 | 1622 | |
1f4a9ebd UD |
1623 | if (special) |
1624 | /* Cannot assign special parameters. */ | |
1625 | goto syntax; | |
1626 | ||
8d9618b7 UD |
1627 | for (i = 0; i < we.we_wordc; i++) |
1628 | words_size += strlen (we.we_wordv[i]) + 1; /* for <space> */ | |
1629 | words_size++; | |
3db52d94 | 1630 | |
8d9618b7 UD |
1631 | cp = words = __alloca (words_size); |
1632 | *words = 0; | |
1633 | for (i = 0; i < we.we_wordc - 1; i++) | |
1634 | { | |
1635 | cp = __stpcpy (cp, we.we_wordv[i]); | |
1636 | *cp++ = ' '; | |
1637 | } | |
3db52d94 | 1638 | |
1f4a9ebd | 1639 | strcpy (cp, we.we_wordv[i]); |
8d9618b7 UD |
1640 | |
1641 | /* Also assign */ | |
1642 | setenv (env, words, 1); | |
1643 | } | |
1644 | ||
1645 | wordfree (&we); | |
33c3e20e | 1646 | goto success; |
3db52d94 UD |
1647 | } |
1648 | ||
3c20b9b6 | 1649 | case ACT_NONNULL_SUBST: |
3db52d94 UD |
1650 | if (value && *value) |
1651 | goto subst_word; | |
1652 | ||
1653 | if (!colon_seen && value) | |
1654 | goto subst_word; | |
1655 | ||
1656 | /* Substitute NULL */ | |
68b50604 UD |
1657 | if (free_value) |
1658 | free (value); | |
33c3e20e | 1659 | goto success; |
3db52d94 | 1660 | |
3c20b9b6 | 1661 | case ACT_NULL_ASSIGN: |
3db52d94 UD |
1662 | if (value && *value) |
1663 | /* Substitute parameter */ | |
1664 | break; | |
1665 | ||
1666 | if (!colon_seen && value) | |
1667 | { | |
1668 | /* Substitute NULL */ | |
68b50604 UD |
1669 | if (free_value) |
1670 | free (value); | |
33c3e20e | 1671 | goto success; |
3db52d94 UD |
1672 | } |
1673 | ||
1674 | /* This checks for '=' so it knows to assign */ | |
1675 | goto subst_word; | |
1676 | ||
8f2ece69 | 1677 | default: |
3db52d94 | 1678 | assert (! "Unrecognised action!"); |
8f2ece69 UD |
1679 | } |
1680 | } | |
1681 | ||
33c3e20e UD |
1682 | free (env); env = NULL; |
1683 | free (pattern); pattern = NULL; | |
8f2ece69 | 1684 | |
14c44e2e | 1685 | if (seen_hash) |
3db52d94 UD |
1686 | { |
1687 | char param_length[21]; | |
1688 | param_length[20] = '\0'; | |
1689 | *word = w_addstr (*word, word_length, max_length, | |
1f4a9ebd UD |
1690 | _itoa_word (value ? strlen (value) : 0, |
1691 | ¶m_length[20], 10, 0)); | |
1692 | if (free_value) | |
1693 | { | |
1694 | assert (value != NULL); | |
1695 | free (value); | |
1696 | } | |
1697 | ||
3db52d94 UD |
1698 | return *word ? 0 : WRDE_NOSPACE; |
1699 | } | |
1700 | ||
1f4a9ebd UD |
1701 | if (value == NULL) |
1702 | return 0; | |
1703 | ||
9b3c7c3c UD |
1704 | if (quoted || !pwordexp) |
1705 | { | |
1706 | /* Quoted - no field split */ | |
1707 | *word = w_addstr (*word, word_length, max_length, value); | |
1708 | if (free_value) | |
1709 | free (value); | |
af69217f | 1710 | |
9b3c7c3c UD |
1711 | return *word ? 0 : WRDE_NOSPACE; |
1712 | } | |
1713 | else | |
1714 | { | |
1715 | /* Need to field-split */ | |
1716 | char *value_copy = __strdup (value); /* Don't modify value */ | |
1717 | char *field_begin = value_copy; | |
1718 | int seen_nonws_ifs = 0; | |
1719 | ||
1720 | if (free_value) | |
1721 | free (value); | |
1722 | ||
1723 | if (value_copy == NULL) | |
1724 | goto no_space; | |
1725 | ||
1726 | do | |
1727 | { | |
1728 | char *field_end = field_begin; | |
1729 | char *next_field; | |
1730 | ||
1731 | /* If this isn't the first field, start a new word */ | |
1732 | if (field_begin != value_copy) | |
1733 | { | |
1734 | if (w_addword (pwordexp, *word) == WRDE_NOSPACE) | |
1735 | { | |
1736 | free (value_copy); | |
1737 | goto no_space; | |
1738 | } | |
1739 | ||
1740 | *word = w_newword (word_length, max_length); | |
1741 | } | |
1742 | ||
1743 | /* Skip IFS whitespace before the field */ | |
1744 | field_begin += strspn (field_begin, ifs_white); | |
1745 | ||
1746 | if (!seen_nonws_ifs && *field_begin == 0) | |
1747 | /* Nothing but whitespace */ | |
1748 | break; | |
1749 | ||
1750 | /* Search for the end of the field */ | |
1751 | field_end = field_begin + strcspn (field_begin, ifs); | |
1752 | ||
1753 | /* Set up pointer to the character after end of field and | |
1754 | skip whitespace IFS after it. */ | |
1755 | next_field = field_end + strspn (field_end, ifs_white); | |
1756 | ||
1757 | /* Skip at most one non-whitespace IFS character after the field */ | |
1758 | seen_nonws_ifs = 0; | |
1759 | if (*next_field && strchr (ifs, *next_field)) | |
1760 | { | |
1761 | seen_nonws_ifs = 1; | |
1762 | next_field++; | |
1763 | } | |
1764 | ||
1765 | /* Null-terminate it */ | |
1766 | *field_end = 0; | |
1767 | ||
1768 | /* Tag a copy onto the current word */ | |
1769 | *word = w_addstr (*word, word_length, max_length, field_begin); | |
1770 | ||
1771 | if (*word == NULL && *field_begin != '\0') | |
1772 | { | |
1773 | free (value_copy); | |
1774 | goto no_space; | |
1775 | } | |
1776 | ||
1777 | field_begin = next_field; | |
1778 | } | |
1779 | while (seen_nonws_ifs || *field_begin); | |
1780 | ||
1781 | free (value_copy); | |
1782 | } | |
1783 | ||
1784 | return 0; | |
8f2ece69 | 1785 | |
33c3e20e UD |
1786 | success: |
1787 | error = 0; | |
1788 | goto do_error; | |
8f2ece69 | 1789 | |
33c3e20e UD |
1790 | no_space: |
1791 | error = WRDE_NOSPACE; | |
1792 | goto do_error; | |
af6f3906 UD |
1793 | |
1794 | syntax: | |
33c3e20e UD |
1795 | error = WRDE_SYNTAX; |
1796 | ||
1797 | do_error: | |
af6f3906 UD |
1798 | if (env) |
1799 | free (env); | |
1800 | ||
1801 | if (pattern) | |
1802 | free (pattern); | |
1803 | ||
33c3e20e | 1804 | return error; |
8f2ece69 UD |
1805 | } |
1806 | ||
1807 | static int | |
dfd2257a | 1808 | internal_function |
40a55d20 UD |
1809 | parse_dollars (char **word, size_t *word_length, size_t *max_length, |
1810 | const char *words, size_t *offset, int flags, | |
2bcf29ba | 1811 | wordexp_t *pwordexp, const char *ifs, const char *ifs_white, |
9b3c7c3c | 1812 | int quoted) |
8f2ece69 UD |
1813 | { |
1814 | /* We are poised _at_ "$" */ | |
1815 | switch (words[1 + *offset]) | |
28f540f4 | 1816 | { |
8f2ece69 UD |
1817 | case '"': |
1818 | case '\'': | |
1819 | case 0: | |
40a55d20 | 1820 | *word = w_addchar (*word, word_length, max_length, '$'); |
8f2ece69 UD |
1821 | return *word ? 0 : WRDE_NOSPACE; |
1822 | ||
1823 | case '(': | |
1824 | if (words[2 + *offset] == '(') | |
1825 | { | |
2bcf29ba UD |
1826 | /* Differentiate between $((1+3)) and $((echo);(ls)) */ |
1827 | int i = 3 + *offset; | |
3c20b9b6 UD |
1828 | int depth = 0; |
1829 | while (words[i] && !(depth == 0 && words[i] == ')')) | |
1830 | { | |
1831 | if (words[i] == '(') | |
1832 | ++depth; | |
1833 | else if (words[i] == ')') | |
1834 | --depth; | |
1835 | ||
1836 | ++i; | |
1837 | } | |
1838 | ||
2bcf29ba UD |
1839 | if (words[i] == ')' && words[i + 1] == ')') |
1840 | { | |
1841 | (*offset) += 3; | |
1842 | /* Call parse_arith -- 0 is for "no brackets" */ | |
1843 | return parse_arith (word, word_length, max_length, words, offset, | |
1844 | flags, 0); | |
1845 | } | |
8f2ece69 UD |
1846 | } |
1847 | ||
1848 | if (flags & WRDE_NOCMD) | |
1849 | return WRDE_CMDSUB; | |
1850 | ||
1851 | (*offset) += 2; | |
40a55d20 | 1852 | return parse_comm (word, word_length, max_length, words, offset, flags, |
8d9618b7 | 1853 | quoted? NULL : pwordexp, ifs, ifs_white); |
8f2ece69 UD |
1854 | |
1855 | case '[': | |
1856 | (*offset) += 2; | |
1857 | /* Call parse_arith -- 1 is for "brackets" */ | |
40a55d20 UD |
1858 | return parse_arith (word, word_length, max_length, words, offset, flags, |
1859 | 1); | |
8f2ece69 UD |
1860 | |
1861 | case '{': | |
1862 | default: | |
1863 | ++(*offset); /* parse_param needs to know if "{" is there */ | |
40a55d20 | 1864 | return parse_param (word, word_length, max_length, words, offset, flags, |
2bcf29ba | 1865 | pwordexp, ifs, ifs_white, quoted); |
28f540f4 | 1866 | } |
8f2ece69 | 1867 | } |
28f540f4 | 1868 | |
8f2ece69 | 1869 | static int |
00995ca9 | 1870 | internal_function |
40a55d20 UD |
1871 | parse_backtick (char **word, size_t *word_length, size_t *max_length, |
1872 | const char *words, size_t *offset, int flags, | |
af69217f | 1873 | wordexp_t *pwordexp, const char *ifs, const char *ifs_white) |
8f2ece69 UD |
1874 | { |
1875 | /* We are poised just after "`" */ | |
1876 | int error; | |
8f2ece69 | 1877 | int squoting = 0; |
e9fc7bbb UD |
1878 | size_t comm_length; |
1879 | size_t comm_maxlen; | |
1880 | char *comm = w_newword (&comm_length, &comm_maxlen); | |
8f2ece69 UD |
1881 | |
1882 | for (; words[*offset]; ++(*offset)) | |
28f540f4 | 1883 | { |
8f2ece69 UD |
1884 | switch (words[*offset]) |
1885 | { | |
1886 | case '`': | |
1887 | /* Go -- give the script to the shell */ | |
40a55d20 | 1888 | error = exec_comm (comm, word, word_length, max_length, flags, |
af69217f | 1889 | pwordexp, ifs, ifs_white); |
8f2ece69 UD |
1890 | free (comm); |
1891 | return error; | |
1892 | ||
1893 | case '\\': | |
1894 | if (squoting) | |
1895 | { | |
40a55d20 UD |
1896 | error = parse_qtd_backslash (&comm, &comm_length, &comm_maxlen, |
1897 | words, offset); | |
8f2ece69 UD |
1898 | |
1899 | if (error) | |
1900 | { | |
1901 | free (comm); | |
1902 | return error; | |
1903 | } | |
1904 | ||
1905 | break; | |
1906 | } | |
1907 | ||
1908 | ++(*offset); | |
40a55d20 UD |
1909 | error = parse_backslash (&comm, &comm_length, &comm_maxlen, words, |
1910 | offset); | |
8f2ece69 UD |
1911 | |
1912 | if (error) | |
1913 | { | |
1914 | free (comm); | |
1915 | return error; | |
1916 | } | |
1917 | ||
1918 | break; | |
1919 | ||
1920 | case '\'': | |
1921 | squoting = 1 - squoting; | |
1922 | default: | |
40a55d20 | 1923 | comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]); |
8f2ece69 UD |
1924 | if (comm == NULL) |
1925 | return WRDE_NOSPACE; | |
1926 | } | |
28f540f4 RM |
1927 | } |
1928 | ||
8f2ece69 UD |
1929 | /* Premature end */ |
1930 | free (comm); | |
1931 | return WRDE_SYNTAX; | |
1932 | } | |
28f540f4 | 1933 | |
8f2ece69 | 1934 | static int |
dfd2257a | 1935 | internal_function |
40a55d20 | 1936 | parse_dquote (char **word, size_t *word_length, size_t *max_length, |
2bcf29ba UD |
1937 | const char *words, size_t *offset, int flags, |
1938 | wordexp_t *pwordexp, const char * ifs, const char * ifs_white) | |
8f2ece69 UD |
1939 | { |
1940 | /* We are poised just after a double-quote */ | |
1941 | int error; | |
1942 | ||
1943 | for (; words[*offset]; ++(*offset)) | |
1944 | { | |
1945 | switch (words[*offset]) | |
1946 | { | |
1947 | case '"': | |
1948 | return 0; | |
1949 | ||
1950 | case '$': | |
40a55d20 | 1951 | error = parse_dollars (word, word_length, max_length, words, offset, |
9b3c7c3c | 1952 | flags, pwordexp, ifs, ifs_white, 1); |
2bcf29ba UD |
1953 | /* The ``1'' here is to tell parse_dollars not to |
1954 | * split the fields. It may need to, however ("$@"). | |
8f2ece69 UD |
1955 | */ |
1956 | if (error) | |
1957 | return error; | |
28f540f4 | 1958 | |
8f2ece69 UD |
1959 | break; |
1960 | ||
1961 | case '`': | |
1962 | if (flags & WRDE_NOCMD) | |
40a55d20 | 1963 | return WRDE_CMDSUB; |
8f2ece69 UD |
1964 | |
1965 | ++(*offset); | |
40a55d20 | 1966 | error = parse_backtick (word, word_length, max_length, words, |
af69217f UD |
1967 | offset, flags, NULL, NULL, NULL); |
1968 | /* The first NULL here is to tell parse_backtick not to | |
8f2ece69 UD |
1969 | * split the fields. |
1970 | */ | |
1971 | if (error) | |
1972 | return error; | |
1973 | ||
1974 | break; | |
1975 | ||
1976 | case '\\': | |
40a55d20 UD |
1977 | error = parse_qtd_backslash (word, word_length, max_length, words, |
1978 | offset); | |
8f2ece69 UD |
1979 | |
1980 | if (error) | |
1981 | return error; | |
1982 | ||
1983 | break; | |
1984 | ||
1985 | default: | |
40a55d20 | 1986 | *word = w_addchar (*word, word_length, max_length, words[*offset]); |
8f2ece69 UD |
1987 | if (*word == NULL) |
1988 | return WRDE_NOSPACE; | |
1989 | } | |
1990 | } | |
1991 | ||
1992 | /* Unterminated string */ | |
1993 | return WRDE_SYNTAX; | |
28f540f4 RM |
1994 | } |
1995 | ||
8f2ece69 UD |
1996 | /* |
1997 | * wordfree() is to be called after pwordexp is finished with. | |
1998 | */ | |
28f540f4 RM |
1999 | |
2000 | void | |
8f2ece69 | 2001 | wordfree (wordexp_t *pwordexp) |
28f540f4 | 2002 | { |
8f2ece69 UD |
2003 | |
2004 | /* wordexp can set pwordexp to NULL */ | |
2005 | if (pwordexp && pwordexp->we_wordv) | |
2006 | { | |
2007 | char **wordv = pwordexp->we_wordv; | |
2008 | ||
2009 | for (wordv += pwordexp->we_offs; *wordv; ++wordv) | |
2010 | free (*wordv); | |
2011 | ||
2012 | free (pwordexp->we_wordv); | |
2013 | pwordexp->we_wordv = NULL; | |
2014 | } | |
2015 | } | |
2016 | ||
2017 | /* | |
2018 | * wordexp() | |
2019 | */ | |
2020 | ||
2021 | int | |
2022 | wordexp (const char *words, wordexp_t *pwordexp, int flags) | |
2023 | { | |
2024 | size_t wordv_offset; | |
2025 | size_t words_offset; | |
e9fc7bbb UD |
2026 | size_t word_length; |
2027 | size_t max_length; | |
2028 | char *word = w_newword (&word_length, &max_length); | |
40a55d20 | 2029 | int error; |
8f2ece69 UD |
2030 | char *ifs; |
2031 | char ifs_white[4]; | |
2032 | char **old_wordv = pwordexp->we_wordv; | |
2bcf29ba | 2033 | size_t old_wordc = (flags & WRDE_REUSE) ? pwordexp->we_wordc : 0; |
8f2ece69 UD |
2034 | |
2035 | if (flags & WRDE_REUSE) | |
22bc7978 UD |
2036 | { |
2037 | /* Minimal implementation of WRDE_REUSE for now */ | |
2038 | wordfree (pwordexp); | |
2039 | old_wordv = NULL; | |
2040 | } | |
8f2ece69 UD |
2041 | |
2042 | if (flags & WRDE_DOOFFS) | |
2043 | { | |
2044 | pwordexp->we_wordv = calloc (1 + pwordexp->we_offs, sizeof (char *)); | |
2045 | if (pwordexp->we_wordv == NULL) | |
33c3e20e UD |
2046 | { |
2047 | error = WRDE_NOSPACE; | |
2048 | goto do_error; | |
2049 | } | |
8f2ece69 UD |
2050 | } |
2051 | else | |
2052 | { | |
2053 | pwordexp->we_wordv = calloc (1, sizeof (char *)); | |
2054 | if (pwordexp->we_wordv == NULL) | |
33c3e20e UD |
2055 | { |
2056 | error = WRDE_NOSPACE; | |
2057 | goto do_error; | |
2058 | } | |
8f2ece69 UD |
2059 | |
2060 | pwordexp->we_offs = 0; | |
2061 | } | |
2062 | ||
2063 | if ((flags & WRDE_APPEND) == 0) | |
2064 | pwordexp->we_wordc = 0; | |
2065 | ||
2066 | wordv_offset = pwordexp->we_offs + pwordexp->we_wordc; | |
2067 | ||
2068 | /* Find out what the field separators are. | |
2069 | * There are two types: whitespace and non-whitespace. | |
2070 | */ | |
2071 | ifs = getenv ("IFS"); | |
2072 | ||
2073 | if (!ifs) | |
6796bc80 UD |
2074 | /* IFS unset - use <space><tab><newline>. */ |
2075 | ifs = strcpy (ifs_white, " \t\n"); | |
8f2ece69 UD |
2076 | else |
2077 | { | |
2078 | char *ifsch = ifs; | |
2079 | char *whch = ifs_white; | |
2080 | ||
af69217f UD |
2081 | /* Start off with no whitespace IFS characters */ |
2082 | ifs_white[0] = '\0'; | |
2083 | ||
8f2ece69 | 2084 | while (*ifsch != '\0') |
af69217f UD |
2085 | { |
2086 | if ((*ifsch == ' ') || (*ifsch == '\t') || (*ifsch == '\n')) | |
2087 | { | |
2088 | /* Whitespace IFS. See first whether it is already in our | |
2089 | collection. */ | |
2090 | char *runp = ifs_white; | |
8f2ece69 | 2091 | |
af69217f UD |
2092 | while (runp < whch && *runp != '\0' && *runp != *ifsch) |
2093 | ++runp; | |
8f2ece69 | 2094 | |
af69217f UD |
2095 | if (runp == whch) |
2096 | *whch++ = *ifsch; | |
2097 | } | |
2098 | ||
3db52d94 | 2099 | ++ifsch; |
af69217f | 2100 | } |
8f2ece69 UD |
2101 | *whch = '\0'; |
2102 | } | |
2103 | ||
9b3c7c3c | 2104 | for (words_offset = 0 ; words[words_offset] ; ++words_offset) |
8f2ece69 UD |
2105 | switch (words[words_offset]) |
2106 | { | |
8f2ece69 | 2107 | case '\\': |
40a55d20 UD |
2108 | error = parse_backslash (&word, &word_length, &max_length, words, |
2109 | &words_offset); | |
8f2ece69 UD |
2110 | |
2111 | if (error) | |
2112 | goto do_error; | |
2113 | ||
2114 | break; | |
2115 | ||
2116 | case '$': | |
40a55d20 | 2117 | error = parse_dollars (&word, &word_length, &max_length, words, |
2bcf29ba | 2118 | &words_offset, flags, pwordexp, ifs, ifs_white, |
9b3c7c3c | 2119 | 0); |
8f2ece69 UD |
2120 | |
2121 | if (error) | |
2122 | goto do_error; | |
2123 | ||
2124 | break; | |
2125 | ||
2126 | case '`': | |
2127 | if (flags & WRDE_NOCMD) | |
33c3e20e UD |
2128 | { |
2129 | error = WRDE_CMDSUB; | |
2130 | goto do_error; | |
2131 | } | |
8f2ece69 UD |
2132 | |
2133 | ++words_offset; | |
40a55d20 | 2134 | error = parse_backtick (&word, &word_length, &max_length, words, |
af69217f UD |
2135 | &words_offset, flags, pwordexp, ifs, |
2136 | ifs_white); | |
8f2ece69 UD |
2137 | |
2138 | if (error) | |
2139 | goto do_error; | |
2140 | ||
2141 | break; | |
2142 | ||
2143 | case '"': | |
2144 | ++words_offset; | |
40a55d20 | 2145 | error = parse_dquote (&word, &word_length, &max_length, words, |
2bcf29ba | 2146 | &words_offset, flags, pwordexp, ifs, ifs_white); |
8f2ece69 UD |
2147 | |
2148 | if (error) | |
2149 | goto do_error; | |
2150 | ||
2151 | break; | |
2152 | ||
2153 | case '\'': | |
2154 | ++words_offset; | |
40a55d20 UD |
2155 | error = parse_squote (&word, &word_length, &max_length, words, |
2156 | &words_offset); | |
8f2ece69 UD |
2157 | |
2158 | if (error) | |
2159 | goto do_error; | |
2160 | ||
2161 | break; | |
2162 | ||
2163 | case '~': | |
40a55d20 UD |
2164 | error = parse_tilde (&word, &word_length, &max_length, words, |
2165 | &words_offset, pwordexp->we_wordc); | |
8f2ece69 UD |
2166 | |
2167 | if (error) | |
2168 | goto do_error; | |
2169 | ||
2170 | break; | |
2171 | ||
2172 | case '*': | |
2bcf29ba UD |
2173 | case '[': |
2174 | case '?': | |
40a55d20 | 2175 | error = parse_glob (&word, &word_length, &max_length, words, |
af69217f | 2176 | &words_offset, flags, pwordexp, ifs, ifs_white); |
8f2ece69 UD |
2177 | |
2178 | if (error) | |
2179 | goto do_error; | |
2180 | ||
2181 | break; | |
2182 | ||
2183 | default: | |
c06cc21c | 2184 | /* Is it a word separator? */ |
9b3c7c3c | 2185 | if (strchr (" \t", words[words_offset]) == NULL) |
8f2ece69 | 2186 | { |
c06cc21c UD |
2187 | char ch = words[words_offset]; |
2188 | ||
2189 | /* Not a word separator -- but is it a valid word char? */ | |
2190 | if (strchr ("\n|&;<>(){}", ch)) | |
6796bc80 UD |
2191 | { |
2192 | /* Fail */ | |
2193 | wordfree (pwordexp); | |
2194 | pwordexp->we_wordc = 0; | |
2195 | pwordexp->we_wordv = old_wordv; | |
2196 | return WRDE_BADCHAR; | |
2197 | } | |
2198 | ||
8f2ece69 | 2199 | /* "Ordinary" character -- add it to word */ |
40a55d20 | 2200 | word = w_addchar (word, &word_length, &max_length, |
c06cc21c | 2201 | ch); |
8f2ece69 UD |
2202 | if (word == NULL) |
2203 | { | |
2204 | error = WRDE_NOSPACE; | |
2205 | goto do_error; | |
2206 | } | |
2207 | ||
2208 | break; | |
2209 | } | |
2210 | ||
c06cc21c | 2211 | /* If a word has been delimited, add it to the list. */ |
40a55d20 | 2212 | if (word != NULL) |
8f2ece69 | 2213 | { |
9b3c7c3c | 2214 | error = w_addword (pwordexp, word); |
c06cc21c UD |
2215 | if (error) |
2216 | goto do_error; | |
8f2ece69 UD |
2217 | } |
2218 | ||
a8125d85 UD |
2219 | word = w_newword (&word_length, &max_length); |
2220 | } | |
8f2ece69 | 2221 | |
9b3c7c3c UD |
2222 | /* End of string */ |
2223 | ||
2224 | /* There was a word separator at the end */ | |
2225 | if (word == NULL) /* i.e. w_newword */ | |
2226 | return 0; | |
2227 | ||
2228 | /* There was no field separator at the end */ | |
2229 | return w_addword (pwordexp, word); | |
8f2ece69 UD |
2230 | |
2231 | do_error: | |
2232 | /* Error: | |
2bcf29ba UD |
2233 | * free memory used (unless error is WRDE_NOSPACE), and |
2234 | * set we_wordc and wd_wordv back to what they were. | |
8f2ece69 | 2235 | */ |
2bcf29ba | 2236 | |
8f2ece69 UD |
2237 | if (word != NULL) |
2238 | free (word); | |
2239 | ||
c06cc21c UD |
2240 | if (error == WRDE_NOSPACE) |
2241 | return WRDE_NOSPACE; | |
2242 | ||
8f2ece69 UD |
2243 | wordfree (pwordexp); |
2244 | pwordexp->we_wordv = old_wordv; | |
2245 | pwordexp->we_wordc = old_wordc; | |
2246 | return error; | |
28f540f4 | 2247 | } |