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Commit | Line | Data |
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8f2ece69 | 1 | /* POSIX.2 wordexp implementation. |
4ad1f026 | 2 | Copyright (C) 1997, 1998, 1999 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 | ||
bac660f8 | 77 | /* Result of w_newword will be ignored if it's 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 | ||
c5f57c58 | 314 | if (result == 0 && tpwd != NULL && pwd.pw_dir != NULL) |
8f2ece69 | 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 | ||
c5f57c58 | 343 | if (result == 0 && tpwd != NULL && 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 | |
4708015f UD |
862 | /* Make sure the subshell doesn't field-split on our behalf. */ |
863 | unsetenv ("IFS"); | |
864 | ||
50304ef0 | 865 | __close (fildes[0]); |
86187531 | 866 | __execve (_PATH_BSHELL, (char *const *) args, __environ); |
40a55d20 | 867 | |
86187531 UD |
868 | /* Bad. What now? */ |
869 | abort (); | |
8f2ece69 | 870 | } |
28f540f4 | 871 | |
8f2ece69 UD |
872 | /* Parent */ |
873 | ||
50304ef0 | 874 | __close (fildes[1]); |
8f2ece69 | 875 | buffer = __alloca (bufsize); |
28f540f4 | 876 | |
9b3c7c3c UD |
877 | if (!pwordexp) |
878 | { /* Quoted - no field splitting */ | |
879 | ||
880 | while (1) | |
8f2ece69 | 881 | { |
50304ef0 | 882 | if ((buflen = __read (fildes[0], buffer, bufsize)) < 1) |
9b3c7c3c UD |
883 | { |
884 | if (__waitpid (pid, NULL, WNOHANG) == 0) | |
885 | continue; | |
886 | if ((buflen = __read (fildes[0], buffer, bufsize)) < 1) | |
887 | break; | |
888 | } | |
889 | ||
890 | *word = w_addmem (*word, word_length, max_length, buffer, buflen); | |
891 | if (*word == NULL) | |
892 | goto no_space; | |
8f2ece69 | 893 | } |
9b3c7c3c UD |
894 | } |
895 | else | |
896 | /* Not quoted - split fields */ | |
897 | { | |
898 | int copying = 0; | |
899 | /* 'copying' is: | |
900 | * 0 when searching for first character in a field not IFS white space | |
901 | * 1 when copying the text of a field | |
902 | * 2 when searching for possible non-whitespace IFS | |
903 | */ | |
904 | ||
905 | while (1) | |
906 | { | |
907 | if ((buflen = __read (fildes[0], buffer, bufsize)) < 1) | |
908 | { | |
909 | if (__waitpid (pid, NULL, WNOHANG) == 0) | |
910 | continue; | |
911 | if ((__read (fildes[0], buffer, bufsize)) < 1) | |
912 | break; | |
913 | } | |
a8125d85 | 914 | |
9b3c7c3c UD |
915 | for (i = 0; i < buflen; ++i) |
916 | { | |
917 | if (strchr (ifs, buffer[i]) != NULL) | |
918 | { | |
919 | /* Current character is IFS */ | |
920 | if (strchr (ifs_white, buffer[i]) == NULL) | |
921 | { | |
922 | /* Current character is IFS but not whitespace */ | |
923 | if (copying == 2) | |
924 | { | |
925 | /* current character | |
926 | * | | |
927 | * V | |
928 | * eg: text<space><comma><space>moretext | |
929 | * | |
930 | * So, strip whitespace IFS (like at the start) | |
931 | */ | |
932 | copying = 0; | |
933 | continue; | |
934 | } | |
935 | ||
936 | copying = 0; | |
937 | /* fall through and delimit field.. */ | |
938 | } | |
939 | else | |
940 | { | |
941 | /* Current character is IFS white space */ | |
942 | ||
943 | /* If not copying a field, ignore it */ | |
944 | if (copying != 1) | |
945 | continue; | |
946 | ||
947 | /* End of field (search for non-ws IFS afterwards) */ | |
948 | copying = 2; | |
949 | } | |
950 | ||
951 | /* First IFS white space, or IFS non-whitespace. | |
952 | * Delimit the field. Nulls are converted by w_addword. */ | |
953 | if (w_addword (pwordexp, *word) == WRDE_NOSPACE) | |
954 | goto no_space; | |
955 | ||
956 | *word = w_newword (word_length, max_length); | |
957 | /* fall back round the loop.. */ | |
958 | } | |
959 | else | |
960 | { | |
961 | /* Not IFS character */ | |
962 | copying = 1; | |
963 | ||
964 | *word = w_addchar (*word, word_length, max_length, | |
965 | buffer[i]); | |
966 | if (*word == NULL) | |
967 | goto no_space; | |
968 | } | |
969 | } | |
970 | } | |
8f2ece69 | 971 | } |
28f540f4 | 972 | |
22bc7978 UD |
973 | /* Bash chops off trailing newlines, which seems sensible. */ |
974 | while (*word_length > 0 && (*word)[*word_length - 1] == '\n') | |
1720f4d0 UD |
975 | { |
976 | (*word)[--*word_length] = '\0'; | |
977 | ||
1ffaaca2 | 978 | /* If the last word was entirely newlines, turn it into a new word |
1720f4d0 | 979 | * which can be ignored if there's nothing following it. */ |
1ffaaca2 | 980 | if (*word_length == 0) |
1720f4d0 UD |
981 | { |
982 | free (*word); | |
983 | *word = w_newword (word_length, max_length); | |
1ffaaca2 | 984 | break; |
1720f4d0 UD |
985 | } |
986 | } | |
22bc7978 | 987 | |
50304ef0 | 988 | __close (fildes[0]); |
8f2ece69 | 989 | return 0; |
33c3e20e UD |
990 | |
991 | no_space: | |
992 | __kill (pid, SIGKILL); | |
993 | __waitpid (pid, NULL, 0); | |
994 | __close (fildes[0]); | |
995 | return WRDE_NOSPACE; | |
8f2ece69 UD |
996 | } |
997 | ||
998 | static int | |
3db52d94 | 999 | internal_function |
40a55d20 | 1000 | parse_comm (char **word, size_t *word_length, size_t *max_length, |
af69217f UD |
1001 | const char *words, size_t *offset, int flags, wordexp_t *pwordexp, |
1002 | const char *ifs, const char *ifs_white) | |
8f2ece69 UD |
1003 | { |
1004 | /* We are poised just after "$(" */ | |
1005 | int paren_depth = 1; | |
3c20b9b6 | 1006 | int error = 0; |
3c20b9b6 | 1007 | int quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */ |
e9fc7bbb UD |
1008 | size_t comm_length; |
1009 | size_t comm_maxlen; | |
1010 | char *comm = w_newword (&comm_length, &comm_maxlen); | |
8f2ece69 UD |
1011 | |
1012 | for (; words[*offset]; ++(*offset)) | |
28f540f4 | 1013 | { |
8f2ece69 | 1014 | switch (words[*offset]) |
28f540f4 | 1015 | { |
3c20b9b6 UD |
1016 | case '\'': |
1017 | if (quoted == 0) | |
1018 | quoted = 1; | |
1019 | else if (quoted == 1) | |
1020 | quoted = 0; | |
1021 | ||
1022 | break; | |
1023 | ||
1024 | case '"': | |
1025 | if (quoted == 0) | |
1026 | quoted = 2; | |
1027 | else if (quoted == 2) | |
1028 | quoted = 0; | |
1029 | ||
1030 | break; | |
1031 | ||
8f2ece69 | 1032 | case ')': |
3c20b9b6 | 1033 | if (!quoted && --paren_depth == 0) |
8f2ece69 UD |
1034 | { |
1035 | /* Go -- give script to the shell */ | |
3c20b9b6 UD |
1036 | if (comm) |
1037 | { | |
1038 | error = exec_comm (comm, word, word_length, max_length, | |
1039 | flags, pwordexp, ifs, ifs_white); | |
1040 | free (comm); | |
1041 | } | |
1042 | ||
8f2ece69 UD |
1043 | return error; |
1044 | } | |
1045 | ||
1046 | /* This is just part of the script */ | |
8f2ece69 UD |
1047 | break; |
1048 | ||
1049 | case '(': | |
3c20b9b6 UD |
1050 | if (!quoted) |
1051 | ++paren_depth; | |
28f540f4 | 1052 | } |
3c20b9b6 UD |
1053 | |
1054 | comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]); | |
1055 | if (comm == NULL) | |
1056 | return WRDE_NOSPACE; | |
28f540f4 | 1057 | } |
28f540f4 | 1058 | |
8f2ece69 | 1059 | /* Premature end */ |
3c20b9b6 UD |
1060 | if (comm) |
1061 | free (comm); | |
1062 | ||
8f2ece69 UD |
1063 | return WRDE_SYNTAX; |
1064 | } | |
28f540f4 | 1065 | |
8f2ece69 | 1066 | static int |
dfd2257a | 1067 | internal_function |
40a55d20 | 1068 | parse_param (char **word, size_t *word_length, size_t *max_length, |
af69217f | 1069 | const char *words, size_t *offset, int flags, wordexp_t *pwordexp, |
2bcf29ba | 1070 | const char *ifs, const char *ifs_white, int quoted) |
8f2ece69 UD |
1071 | { |
1072 | /* We are poised just after "$" */ | |
3c20b9b6 | 1073 | enum action |
af6f3906 | 1074 | { |
3c20b9b6 UD |
1075 | ACT_NONE, |
1076 | ACT_RP_SHORT_LEFT = '#', | |
1077 | ACT_RP_LONG_LEFT = 'L', | |
1078 | ACT_RP_SHORT_RIGHT = '%', | |
1079 | ACT_RP_LONG_RIGHT = 'R', | |
1080 | ACT_NULL_ERROR = '?', | |
1081 | ACT_NULL_SUBST = '-', | |
1082 | ACT_NONNULL_SUBST = '+', | |
1083 | ACT_NULL_ASSIGN = '=' | |
af6f3906 | 1084 | }; |
e9fc7bbb UD |
1085 | size_t env_length; |
1086 | size_t env_maxlen; | |
1087 | size_t pat_length; | |
1088 | size_t pat_maxlen; | |
3c20b9b6 | 1089 | size_t start = *offset; |
e9fc7bbb UD |
1090 | char *env; |
1091 | char *pattern; | |
2bcf29ba | 1092 | char *value = NULL; |
3c20b9b6 | 1093 | enum action action = ACT_NONE; |
8f2ece69 | 1094 | int depth = 0; |
3c20b9b6 | 1095 | int colon_seen = 0; |
14c44e2e | 1096 | int seen_hash = 0; |
76fbcfdd | 1097 | int free_value = 0; |
3c20b9b6 | 1098 | int pattern_is_quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */ |
8f2ece69 | 1099 | int error; |
1f4a9ebd UD |
1100 | int special = 0; |
1101 | char buffer[21]; | |
3c20b9b6 UD |
1102 | int brace = words[*offset] == '{'; |
1103 | ||
e9fc7bbb UD |
1104 | env = w_newword (&env_length, &env_maxlen); |
1105 | pattern = w_newword (&pat_length, &pat_maxlen); | |
1106 | ||
3c20b9b6 UD |
1107 | if (brace) |
1108 | ++*offset; | |
8f2ece69 | 1109 | |
1f4a9ebd UD |
1110 | /* First collect the parameter name. */ |
1111 | ||
1112 | if (words[*offset] == '#') | |
8f2ece69 | 1113 | { |
1f4a9ebd UD |
1114 | seen_hash = 1; |
1115 | if (!brace) | |
1116 | goto envsubst; | |
1117 | ++*offset; | |
1118 | } | |
af6f3906 | 1119 | |
1f4a9ebd UD |
1120 | if (isalpha (words[*offset]) || words[*offset] == '_') |
1121 | { | |
1122 | /* Normal parameter name. */ | |
1123 | do | |
1124 | { | |
1125 | env = w_addchar (env, &env_length, &env_maxlen, | |
1126 | words[*offset]); | |
1127 | if (env == NULL) | |
1128 | goto no_space; | |
1129 | } | |
1130 | while (isalnum (words[++*offset]) || words[*offset] == '_'); | |
1131 | } | |
1132 | else if (isdigit (words[*offset])) | |
1133 | { | |
1134 | /* Numeric parameter name. */ | |
1135 | special = 1; | |
1136 | do | |
1137 | { | |
1138 | env = w_addchar (env, &env_length, &env_maxlen, | |
1139 | words[*offset]); | |
1140 | if (env == NULL) | |
1141 | goto no_space; | |
1142 | if (!brace) | |
1143 | goto envsubst; | |
1144 | } | |
1145 | while (isdigit(words[++*offset])); | |
1146 | } | |
1147 | else if (strchr ("*@$", words[*offset]) != NULL) | |
1148 | { | |
1149 | /* Special parameter. */ | |
1150 | special = 1; | |
1151 | env = w_addchar (env, &env_length, &env_maxlen, | |
1152 | words[*offset]); | |
1153 | if (env == NULL) | |
1154 | goto no_space; | |
1155 | ++*offset; | |
1156 | } | |
1157 | else | |
1158 | { | |
1159 | if (brace) | |
1160 | goto syntax; | |
1161 | } | |
1162 | ||
1163 | if (brace) | |
1164 | { | |
1165 | /* Check for special action to be applied to the value. */ | |
1166 | switch (words[*offset]) | |
1167 | { | |
1168 | case '}': | |
68b50604 | 1169 | /* Evaluate. */ |
1f4a9ebd UD |
1170 | goto envsubst; |
1171 | ||
1172 | case '#': | |
1173 | action = ACT_RP_SHORT_LEFT; | |
1174 | if (words[1 + *offset] == '#') | |
1175 | { | |
1176 | ++*offset; | |
1177 | action = ACT_RP_LONG_LEFT; | |
1178 | } | |
1179 | break; | |
1180 | ||
1181 | case '%': | |
1182 | action = ACT_RP_SHORT_RIGHT; | |
1183 | if (words[1 + *offset] == '%') | |
1184 | { | |
1185 | ++*offset; | |
1186 | action = ACT_RP_LONG_RIGHT; | |
1187 | } | |
1188 | break; | |
1189 | ||
1190 | case ':': | |
1191 | if (strchr ("-=?+", words[1 + *offset]) == NULL) | |
1192 | goto syntax; | |
1193 | ||
1194 | colon_seen = 1; | |
1195 | action = words[++*offset]; | |
1196 | break; | |
1197 | ||
1198 | case '-': | |
1199 | case '=': | |
1200 | case '?': | |
1201 | case '+': | |
1202 | action = words[*offset]; | |
1203 | break; | |
1204 | ||
1205 | default: | |
1206 | goto syntax; | |
1207 | } | |
1208 | ||
bac660f8 | 1209 | /* Now collect the pattern, but don't expand it yet. */ |
1f4a9ebd UD |
1210 | ++*offset; |
1211 | for (; words[*offset]; ++(*offset)) | |
3c20b9b6 UD |
1212 | { |
1213 | switch (words[*offset]) | |
8f2ece69 | 1214 | { |
3c20b9b6 UD |
1215 | case '{': |
1216 | if (!pattern_is_quoted) | |
1217 | ++depth; | |
1218 | break; | |
8f2ece69 | 1219 | |
3c20b9b6 UD |
1220 | case '}': |
1221 | if (!pattern_is_quoted) | |
1222 | { | |
1223 | if (depth == 0) | |
1224 | goto envsubst; | |
1225 | --depth; | |
1226 | } | |
8f2ece69 | 1227 | break; |
8f2ece69 | 1228 | |
3c20b9b6 | 1229 | case '\\': |
bac660f8 UD |
1230 | if (pattern_is_quoted) |
1231 | /* Quoted; treat as normal character. */ | |
1232 | break; | |
1233 | ||
1234 | /* Otherwise, it's an escape: next character is literal. */ | |
1235 | if (words[++*offset] == '\0') | |
3c20b9b6 | 1236 | goto syntax; |
bac660f8 UD |
1237 | |
1238 | pattern = w_addchar (pattern, &pat_length, &pat_maxlen, '\\'); | |
1239 | if (pattern == NULL) | |
1240 | goto no_space; | |
1241 | ||
3c20b9b6 | 1242 | break; |
af6f3906 | 1243 | |
3c20b9b6 UD |
1244 | case '\'': |
1245 | if (pattern_is_quoted == 0) | |
1246 | pattern_is_quoted = 1; | |
1247 | else if (pattern_is_quoted == 1) | |
1248 | pattern_is_quoted = 0; | |
8f2ece69 | 1249 | |
3c20b9b6 | 1250 | break; |
8f2ece69 | 1251 | |
3c20b9b6 UD |
1252 | case '"': |
1253 | if (pattern_is_quoted == 0) | |
1254 | pattern_is_quoted = 2; | |
1255 | else if (pattern_is_quoted == 2) | |
1256 | pattern_is_quoted = 0; | |
8f2ece69 | 1257 | |
3c20b9b6 | 1258 | break; |
8f2ece69 UD |
1259 | } |
1260 | ||
3c20b9b6 UD |
1261 | pattern = w_addchar (pattern, &pat_length, &pat_maxlen, |
1262 | words[*offset]); | |
1263 | if (pattern == NULL) | |
1264 | goto no_space; | |
8f2ece69 UD |
1265 | } |
1266 | } | |
1267 | ||
1f4a9ebd UD |
1268 | /* End of input string -- remember to reparse the character that we |
1269 | * stopped at. */ | |
8f2ece69 UD |
1270 | --(*offset); |
1271 | ||
1272 | envsubst: | |
1273 | if (words[start] == '{' && words[*offset] != '}') | |
af6f3906 | 1274 | goto syntax; |
8f2ece69 | 1275 | |
1f4a9ebd | 1276 | if (env == NULL) |
8f2ece69 | 1277 | { |
14c44e2e UD |
1278 | if (seen_hash) |
1279 | { | |
1280 | /* $# expands to the number of positional parameters */ | |
14c44e2e | 1281 | buffer[20] = '\0'; |
1f4a9ebd UD |
1282 | value = _itoa_word (__libc_argc - 1, &buffer[20], 10, 0); |
1283 | seen_hash = 0; | |
14c44e2e UD |
1284 | } |
1285 | else | |
1286 | { | |
1287 | /* Just $ on its own */ | |
1288 | *offset = start - 1; | |
1289 | *word = w_addchar (*word, word_length, max_length, '$'); | |
1f4a9ebd | 1290 | return *word ? 0 : WRDE_NOSPACE; |
14c44e2e | 1291 | } |
8f2ece69 | 1292 | } |
e9fc7bbb | 1293 | /* Is it a numeric parameter? */ |
1f4a9ebd UD |
1294 | else if (isdigit (env[0])) |
1295 | { | |
1296 | int n = atoi (env); | |
8f2ece69 | 1297 | |
1f4a9ebd UD |
1298 | if (n >= __libc_argc) |
1299 | /* Substitute NULL. */ | |
1300 | value = NULL; | |
1301 | else | |
1302 | /* Replace with appropriate positional parameter. */ | |
1303 | value = __libc_argv[n]; | |
1304 | } | |
14c44e2e | 1305 | /* Is it a special parameter? */ |
1f4a9ebd | 1306 | else if (special) |
2bcf29ba | 1307 | { |
1f4a9ebd UD |
1308 | /* Is it `$$'? */ |
1309 | if (*env == '$') | |
14c44e2e | 1310 | { |
1f4a9ebd | 1311 | buffer[20] = '\0'; |
50304ef0 | 1312 | value = _itoa_word (__getpid (), &buffer[20], 10, 0); |
14c44e2e | 1313 | } |
1f4a9ebd UD |
1314 | /* Is it `${#*}' or `${#@}'? */ |
1315 | else if ((*env == '*' || *env == '@') && seen_hash) | |
2bcf29ba | 1316 | { |
1f4a9ebd UD |
1317 | buffer[20] = '\0'; |
1318 | value = _itoa_word (__libc_argc > 0 ? __libc_argc - 1 : 0, | |
1319 | &buffer[20], 10, 0); | |
1320 | *word = w_addstr (*word, word_length, max_length, value); | |
14c44e2e | 1321 | free (env); |
33c3e20e UD |
1322 | if (pattern) |
1323 | free (pattern); | |
14c44e2e UD |
1324 | return *word ? 0 : WRDE_NOSPACE; |
1325 | } | |
1326 | /* Is it `$*' or `$@' (unquoted) ? */ | |
1327 | else if (*env == '*' || (*env == '@' && !quoted)) | |
1328 | { | |
68b50604 | 1329 | size_t plist_len = 0; |
14c44e2e | 1330 | int p; |
68b50604 | 1331 | char *end; |
14c44e2e | 1332 | |
2bcf29ba | 1333 | /* Build up value parameter by parameter (copy them) */ |
68b50604 UD |
1334 | for (p = 1; __libc_argv[p]; ++p) |
1335 | plist_len += strlen (__libc_argv[p]) + 1; /* for space */ | |
1336 | value = malloc (plist_len); | |
1337 | if (value == NULL) | |
1338 | goto no_space; | |
1339 | end = value; | |
1340 | *end = 0; | |
8d9618b7 | 1341 | for (p = 1; __libc_argv[p]; ++p) |
2bcf29ba | 1342 | { |
68b50604 UD |
1343 | if (p > 1) |
1344 | *end++ = ' '; | |
1345 | end = __stpcpy (end, __libc_argv[p]); | |
2bcf29ba UD |
1346 | } |
1347 | ||
76fbcfdd | 1348 | free_value = 1; |
2bcf29ba | 1349 | } |
1f4a9ebd UD |
1350 | else |
1351 | { | |
1352 | /* Must be a quoted `$@' */ | |
1353 | assert (*env == '@' && quoted); | |
2bcf29ba | 1354 | |
1f4a9ebd UD |
1355 | /* Each parameter is a separate word ("$@") */ |
1356 | if (__libc_argc == 2) | |
68b50604 | 1357 | value = __libc_argv[1]; |
1f4a9ebd UD |
1358 | else if (__libc_argc > 2) |
1359 | { | |
1360 | int p; | |
14c44e2e | 1361 | |
1f4a9ebd UD |
1362 | /* Append first parameter to current word. */ |
1363 | value = w_addstr (*word, word_length, max_length, | |
1364 | __libc_argv[1]); | |
1365 | if (value == NULL || w_addword (pwordexp, value)) | |
1366 | goto no_space; | |
14c44e2e | 1367 | |
1f4a9ebd UD |
1368 | for (p = 2; __libc_argv[p + 1]; p++) |
1369 | { | |
1370 | char *newword = __strdup (__libc_argv[p]); | |
1371 | if (newword == NULL || w_addword (pwordexp, newword)) | |
1372 | goto no_space; | |
1373 | } | |
2bcf29ba | 1374 | |
1f4a9ebd | 1375 | /* Start a new word with the last parameter. */ |
e9fc7bbb | 1376 | *word = w_newword (word_length, max_length); |
fdacb17d | 1377 | value = __libc_argv[p]; |
1f4a9ebd UD |
1378 | } |
1379 | else | |
2bcf29ba | 1380 | { |
1f4a9ebd UD |
1381 | free (env); |
1382 | free (pattern); | |
1383 | return 0; | |
2bcf29ba UD |
1384 | } |
1385 | } | |
2bcf29ba | 1386 | } |
1f4a9ebd | 1387 | else |
68b50604 UD |
1388 | value = getenv (env); |
1389 | ||
1390 | if (value == NULL && (flags & WRDE_UNDEF)) | |
1f4a9ebd | 1391 | { |
68b50604 | 1392 | /* Variable not defined. */ |
33c3e20e UD |
1393 | error = WRDE_BADVAL; |
1394 | goto do_error; | |
1f4a9ebd | 1395 | } |
8f2ece69 | 1396 | |
3c20b9b6 | 1397 | if (action != ACT_NONE) |
8f2ece69 | 1398 | { |
bac660f8 UD |
1399 | int expand_pattern = 0; |
1400 | ||
1401 | /* First, find out if we need to expand pattern (i.e. if we will | |
1402 | * use it). */ | |
1403 | switch (action) | |
1404 | { | |
1405 | case ACT_RP_SHORT_LEFT: | |
1406 | case ACT_RP_LONG_LEFT: | |
1407 | case ACT_RP_SHORT_RIGHT: | |
1408 | case ACT_RP_LONG_RIGHT: | |
1409 | /* Always expand for these. */ | |
1410 | expand_pattern = 1; | |
1411 | break; | |
1412 | ||
1413 | case ACT_NULL_ERROR: | |
1414 | case ACT_NULL_SUBST: | |
1415 | case ACT_NULL_ASSIGN: | |
1416 | if (!value || (!*value && colon_seen)) | |
1417 | /* If param is unset, or set but null and a colon has been seen, | |
1418 | the expansion of the pattern will be needed. */ | |
1419 | expand_pattern = 1; | |
1420 | ||
1421 | break; | |
1422 | ||
1423 | case ACT_NONNULL_SUBST: | |
1424 | /* Expansion of word will be needed if parameter is set and not null, | |
1425 | or set null but no colon has been seen. */ | |
1426 | if (value && (*value || !colon_seen)) | |
1427 | expand_pattern = 1; | |
1428 | ||
1429 | break; | |
1430 | ||
1431 | default: | |
1432 | assert (! "Unrecognised action!"); | |
1433 | } | |
1434 | ||
1435 | if (expand_pattern) | |
1436 | { | |
1437 | /* We need to perform tilde expansion, parameter expansion, | |
1438 | command substitution, and arithmetic expansion. We also | |
1439 | have to be a bit careful with wildcard characters, as | |
1440 | pattern might be given to fnmatch soon. To do this, we | |
1441 | convert quotes to escapes. */ | |
1442 | ||
1443 | char *expanded; | |
1444 | size_t exp_len; | |
1445 | size_t exp_maxl; | |
1446 | char *p; | |
1447 | int quoted = 0; /* 1: single quotes; 2: double */ | |
1448 | ||
1449 | expanded = w_newword (&exp_len, &exp_maxl); | |
1450 | for (p = pattern; p && *p; p++) | |
1451 | { | |
4ad1f026 | 1452 | size_t offset; |
bac660f8 UD |
1453 | |
1454 | switch (*p) | |
1455 | { | |
1456 | case '"': | |
1457 | if (quoted == 2) | |
1458 | quoted = 0; | |
1459 | else if (quoted == 0) | |
1460 | quoted = 2; | |
1461 | else break; | |
1462 | ||
1463 | continue; | |
1464 | ||
1465 | case '\'': | |
1466 | if (quoted == 1) | |
1467 | quoted = 0; | |
1468 | else if (quoted == 0) | |
1469 | quoted = 1; | |
1470 | else break; | |
1471 | ||
1472 | continue; | |
1473 | ||
1474 | case '*': | |
1475 | case '?': | |
1476 | if (quoted) | |
1477 | { | |
1478 | /* Convert quoted wildchar to escaped wildchar. */ | |
1479 | expanded = w_addchar (expanded, &exp_len, | |
1480 | &exp_maxl, '\\'); | |
1481 | ||
1482 | if (expanded == NULL) | |
1483 | goto no_space; | |
1484 | } | |
1485 | break; | |
1486 | ||
1487 | case '$': | |
1488 | offset = 0; | |
1489 | error = parse_dollars (&expanded, &exp_len, &exp_maxl, p, | |
1490 | &offset, flags, NULL, NULL, NULL, 1); | |
1491 | if (error) | |
1492 | { | |
1493 | if (free_value) | |
1494 | free (value); | |
1495 | ||
1496 | if (expanded) | |
1497 | free (expanded); | |
1498 | ||
1499 | goto do_error; | |
1500 | } | |
1501 | ||
1502 | p += offset; | |
1503 | continue; | |
1504 | ||
1505 | case '~': | |
1506 | if (quoted || exp_len) | |
1507 | break; | |
1508 | ||
1509 | offset = 0; | |
1510 | error = parse_tilde (&expanded, &exp_len, &exp_maxl, p, | |
1511 | &offset, 0); | |
1512 | if (error) | |
1513 | { | |
1514 | if (free_value) | |
1515 | free (value); | |
1516 | ||
1517 | if (expanded) | |
1518 | free (expanded); | |
1519 | ||
1520 | goto do_error; | |
1521 | } | |
1522 | ||
1523 | p += offset; | |
1524 | continue; | |
1525 | ||
1526 | case '\\': | |
1527 | expanded = w_addchar (expanded, &exp_len, &exp_maxl, '\\'); | |
1528 | ++p; | |
1529 | assert (*p); /* checked when extracted initially */ | |
1530 | if (expanded == NULL) | |
1531 | goto no_space; | |
1532 | } | |
1533 | ||
1534 | expanded = w_addchar (expanded, &exp_len, &exp_maxl, *p); | |
1535 | ||
1536 | if (expanded == NULL) | |
1537 | goto no_space; | |
1538 | } | |
1539 | ||
1540 | if (pattern) | |
1541 | free (pattern); | |
1542 | ||
1543 | pattern = expanded; | |
1544 | } | |
1545 | ||
8f2ece69 UD |
1546 | switch (action) |
1547 | { | |
3c20b9b6 UD |
1548 | case ACT_RP_SHORT_LEFT: |
1549 | case ACT_RP_LONG_LEFT: | |
1550 | case ACT_RP_SHORT_RIGHT: | |
1551 | case ACT_RP_LONG_RIGHT: | |
af6f3906 UD |
1552 | { |
1553 | char *p; | |
1554 | char c; | |
1555 | char *end; | |
1556 | ||
1f4a9ebd | 1557 | if (value == NULL || pattern == NULL || *pattern == '\0') |
af6f3906 UD |
1558 | break; |
1559 | ||
1560 | end = value + strlen (value); | |
1561 | ||
3c20b9b6 | 1562 | switch (action) |
af6f3906 | 1563 | { |
3c20b9b6 | 1564 | case ACT_RP_SHORT_LEFT: |
3db52d94 | 1565 | for (p = value; p <= end; ++p) |
af6f3906 UD |
1566 | { |
1567 | c = *p; | |
1568 | *p = '\0'; | |
1569 | if (fnmatch (pattern, value, 0) != FNM_NOMATCH) | |
1570 | { | |
1571 | *p = c; | |
68b50604 UD |
1572 | if (free_value) |
1573 | { | |
1574 | char *newval = __strdup (p); | |
1575 | if (newval == NULL) | |
1576 | { | |
1577 | free (value); | |
1578 | goto no_space; | |
1579 | } | |
1580 | free (value); | |
1581 | value = newval; | |
1582 | } | |
1583 | else | |
1584 | value = p; | |
af6f3906 UD |
1585 | break; |
1586 | } | |
1587 | *p = c; | |
1588 | } | |
1589 | ||
1590 | break; | |
1591 | ||
3c20b9b6 | 1592 | case ACT_RP_LONG_LEFT: |
3db52d94 | 1593 | for (p = end; p >= value; --p) |
af6f3906 UD |
1594 | { |
1595 | c = *p; | |
1596 | *p = '\0'; | |
1597 | if (fnmatch (pattern, value, 0) != FNM_NOMATCH) | |
1598 | { | |
1599 | *p = c; | |
68b50604 UD |
1600 | if (free_value) |
1601 | { | |
1602 | char *newval = __strdup (p); | |
1603 | if (newval == NULL) | |
1604 | { | |
1605 | free (value); | |
1606 | goto no_space; | |
1607 | } | |
1608 | free (value); | |
1609 | value = newval; | |
1610 | } | |
1611 | else | |
1612 | value = p; | |
af6f3906 UD |
1613 | break; |
1614 | } | |
1615 | *p = c; | |
1616 | } | |
1617 | ||
1618 | break; | |
1619 | ||
3c20b9b6 | 1620 | case ACT_RP_SHORT_RIGHT: |
3db52d94 | 1621 | for (p = end; p >= value; --p) |
af6f3906 UD |
1622 | { |
1623 | if (fnmatch (pattern, p, 0) != FNM_NOMATCH) | |
1624 | { | |
1f4a9ebd UD |
1625 | char *newval; |
1626 | newval = malloc (p - value + 1); | |
33c3e20e | 1627 | |
1f4a9ebd | 1628 | if (newval == NULL) |
33c3e20e UD |
1629 | { |
1630 | if (free_value) | |
1631 | free (value); | |
1632 | goto no_space; | |
1633 | } | |
1634 | ||
1f4a9ebd UD |
1635 | *(char *) __mempcpy (newval, value, p - value) = '\0'; |
1636 | if (free_value) | |
1637 | free (value); | |
1638 | value = newval; | |
1639 | free_value = 1; | |
af6f3906 UD |
1640 | break; |
1641 | } | |
1642 | } | |
1643 | ||
1644 | break; | |
1645 | ||
3c20b9b6 | 1646 | case ACT_RP_LONG_RIGHT: |
3db52d94 | 1647 | for (p = value; p <= end; ++p) |
af6f3906 UD |
1648 | { |
1649 | if (fnmatch (pattern, p, 0) != FNM_NOMATCH) | |
1650 | { | |
1f4a9ebd UD |
1651 | char *newval; |
1652 | newval = malloc (p - value + 1); | |
33c3e20e | 1653 | |
1f4a9ebd | 1654 | if (newval == NULL) |
33c3e20e UD |
1655 | { |
1656 | if (free_value) | |
1657 | free (value); | |
1658 | goto no_space; | |
1659 | } | |
1660 | ||
1f4a9ebd UD |
1661 | *(char *) __mempcpy (newval, value, p - value) = '\0'; |
1662 | if (free_value) | |
1663 | free (value); | |
1664 | value = newval; | |
1665 | free_value = 1; | |
af6f3906 UD |
1666 | break; |
1667 | } | |
1668 | } | |
1669 | ||
1670 | break; | |
1671 | ||
1672 | default: | |
3c20b9b6 | 1673 | break; |
af6f3906 UD |
1674 | } |
1675 | ||
1676 | break; | |
1677 | } | |
8f2ece69 | 1678 | |
3c20b9b6 | 1679 | case ACT_NULL_ERROR: |
8f2ece69 | 1680 | if (value && *value) |
3db52d94 | 1681 | /* Substitute parameter */ |
8f2ece69 UD |
1682 | break; |
1683 | ||
bac660f8 | 1684 | error = 0; |
8f2ece69 | 1685 | if (!colon_seen && value) |
1f4a9ebd | 1686 | /* Substitute NULL */ |
bac660f8 | 1687 | ; |
1f4a9ebd | 1688 | else if (*pattern) |
bac660f8 | 1689 | fprintf (stderr, "%s: %s\n", env, pattern); |
1f4a9ebd UD |
1690 | else |
1691 | { | |
1692 | fprintf (stderr, "%s: parameter null or not set\n", env); | |
1693 | error = WRDE_BADVAL; | |
8f2ece69 UD |
1694 | } |
1695 | ||
68b50604 UD |
1696 | if (free_value) |
1697 | free (value); | |
33c3e20e | 1698 | goto do_error; |
8f2ece69 | 1699 | |
3c20b9b6 | 1700 | case ACT_NULL_SUBST: |
3db52d94 UD |
1701 | if (value && *value) |
1702 | /* Substitute parameter */ | |
1703 | break; | |
1704 | ||
bac660f8 UD |
1705 | if (free_value && value) |
1706 | free (value); | |
3db52d94 | 1707 | |
bac660f8 UD |
1708 | if (!colon_seen && value) |
1709 | /* Substitute NULL */ | |
1710 | goto success; | |
1f4a9ebd | 1711 | |
bac660f8 UD |
1712 | value = pattern ? __strdup (pattern) : pattern; |
1713 | free_value = 1; | |
3db52d94 | 1714 | |
bac660f8 UD |
1715 | if (pattern && !value) |
1716 | goto no_space; | |
3db52d94 | 1717 | |
bac660f8 | 1718 | break; |
8d9618b7 | 1719 | |
bac660f8 UD |
1720 | case ACT_NONNULL_SUBST: |
1721 | if (value && (*value || !colon_seen)) | |
1722 | { | |
1723 | if (free_value && value) | |
1724 | free (value); | |
8d9618b7 | 1725 | |
bac660f8 UD |
1726 | value = pattern ? __strdup (pattern) : pattern; |
1727 | free_value = 1; | |
3db52d94 | 1728 | |
bac660f8 UD |
1729 | if (pattern && !value) |
1730 | goto no_space; | |
3db52d94 | 1731 | |
bac660f8 UD |
1732 | break; |
1733 | } | |
3db52d94 UD |
1734 | |
1735 | /* Substitute NULL */ | |
68b50604 UD |
1736 | if (free_value) |
1737 | free (value); | |
33c3e20e | 1738 | goto success; |
3db52d94 | 1739 | |
3c20b9b6 | 1740 | case ACT_NULL_ASSIGN: |
3db52d94 UD |
1741 | if (value && *value) |
1742 | /* Substitute parameter */ | |
1743 | break; | |
1744 | ||
1745 | if (!colon_seen && value) | |
1746 | { | |
1747 | /* Substitute NULL */ | |
68b50604 UD |
1748 | if (free_value) |
1749 | free (value); | |
33c3e20e | 1750 | goto success; |
3db52d94 UD |
1751 | } |
1752 | ||
bac660f8 UD |
1753 | if (free_value && value) |
1754 | free (value); | |
1755 | ||
1756 | value = pattern ? __strdup (pattern) : pattern; | |
1757 | free_value = 1; | |
1758 | ||
1759 | if (pattern && !value) | |
1760 | goto no_space; | |
1761 | ||
1762 | setenv (env, value, 1); | |
1763 | break; | |
3db52d94 | 1764 | |
8f2ece69 | 1765 | default: |
3db52d94 | 1766 | assert (! "Unrecognised action!"); |
8f2ece69 UD |
1767 | } |
1768 | } | |
1769 | ||
33c3e20e UD |
1770 | free (env); env = NULL; |
1771 | free (pattern); pattern = NULL; | |
8f2ece69 | 1772 | |
14c44e2e | 1773 | if (seen_hash) |
3db52d94 UD |
1774 | { |
1775 | char param_length[21]; | |
1776 | param_length[20] = '\0'; | |
1777 | *word = w_addstr (*word, word_length, max_length, | |
1f4a9ebd UD |
1778 | _itoa_word (value ? strlen (value) : 0, |
1779 | ¶m_length[20], 10, 0)); | |
1780 | if (free_value) | |
1781 | { | |
1782 | assert (value != NULL); | |
1783 | free (value); | |
1784 | } | |
1785 | ||
3db52d94 UD |
1786 | return *word ? 0 : WRDE_NOSPACE; |
1787 | } | |
1788 | ||
1f4a9ebd UD |
1789 | if (value == NULL) |
1790 | return 0; | |
1791 | ||
9b3c7c3c UD |
1792 | if (quoted || !pwordexp) |
1793 | { | |
1794 | /* Quoted - no field split */ | |
1795 | *word = w_addstr (*word, word_length, max_length, value); | |
1796 | if (free_value) | |
1797 | free (value); | |
af69217f | 1798 | |
9b3c7c3c UD |
1799 | return *word ? 0 : WRDE_NOSPACE; |
1800 | } | |
1801 | else | |
1802 | { | |
1803 | /* Need to field-split */ | |
1804 | char *value_copy = __strdup (value); /* Don't modify value */ | |
1805 | char *field_begin = value_copy; | |
1806 | int seen_nonws_ifs = 0; | |
1807 | ||
1808 | if (free_value) | |
1809 | free (value); | |
1810 | ||
1811 | if (value_copy == NULL) | |
1812 | goto no_space; | |
1813 | ||
1814 | do | |
1815 | { | |
1816 | char *field_end = field_begin; | |
1817 | char *next_field; | |
1818 | ||
1819 | /* If this isn't the first field, start a new word */ | |
1820 | if (field_begin != value_copy) | |
1821 | { | |
1822 | if (w_addword (pwordexp, *word) == WRDE_NOSPACE) | |
1823 | { | |
1824 | free (value_copy); | |
1825 | goto no_space; | |
1826 | } | |
1827 | ||
1828 | *word = w_newword (word_length, max_length); | |
1829 | } | |
1830 | ||
1831 | /* Skip IFS whitespace before the field */ | |
1832 | field_begin += strspn (field_begin, ifs_white); | |
1833 | ||
1834 | if (!seen_nonws_ifs && *field_begin == 0) | |
1835 | /* Nothing but whitespace */ | |
1836 | break; | |
1837 | ||
1838 | /* Search for the end of the field */ | |
1839 | field_end = field_begin + strcspn (field_begin, ifs); | |
1840 | ||
1841 | /* Set up pointer to the character after end of field and | |
1842 | skip whitespace IFS after it. */ | |
1843 | next_field = field_end + strspn (field_end, ifs_white); | |
1844 | ||
1845 | /* Skip at most one non-whitespace IFS character after the field */ | |
1846 | seen_nonws_ifs = 0; | |
1847 | if (*next_field && strchr (ifs, *next_field)) | |
1848 | { | |
1849 | seen_nonws_ifs = 1; | |
1850 | next_field++; | |
1851 | } | |
1852 | ||
1853 | /* Null-terminate it */ | |
1854 | *field_end = 0; | |
1855 | ||
1856 | /* Tag a copy onto the current word */ | |
1857 | *word = w_addstr (*word, word_length, max_length, field_begin); | |
1858 | ||
1859 | if (*word == NULL && *field_begin != '\0') | |
1860 | { | |
1861 | free (value_copy); | |
1862 | goto no_space; | |
1863 | } | |
1864 | ||
1865 | field_begin = next_field; | |
1866 | } | |
1867 | while (seen_nonws_ifs || *field_begin); | |
1868 | ||
1869 | free (value_copy); | |
1870 | } | |
1871 | ||
1872 | return 0; | |
8f2ece69 | 1873 | |
33c3e20e UD |
1874 | success: |
1875 | error = 0; | |
1876 | goto do_error; | |
8f2ece69 | 1877 | |
33c3e20e UD |
1878 | no_space: |
1879 | error = WRDE_NOSPACE; | |
1880 | goto do_error; | |
af6f3906 UD |
1881 | |
1882 | syntax: | |
33c3e20e UD |
1883 | error = WRDE_SYNTAX; |
1884 | ||
1885 | do_error: | |
af6f3906 UD |
1886 | if (env) |
1887 | free (env); | |
1888 | ||
1889 | if (pattern) | |
1890 | free (pattern); | |
1891 | ||
33c3e20e | 1892 | return error; |
8f2ece69 UD |
1893 | } |
1894 | ||
1895 | static int | |
dfd2257a | 1896 | internal_function |
40a55d20 UD |
1897 | parse_dollars (char **word, size_t *word_length, size_t *max_length, |
1898 | const char *words, size_t *offset, int flags, | |
2bcf29ba | 1899 | wordexp_t *pwordexp, const char *ifs, const char *ifs_white, |
9b3c7c3c | 1900 | int quoted) |
8f2ece69 UD |
1901 | { |
1902 | /* We are poised _at_ "$" */ | |
1903 | switch (words[1 + *offset]) | |
28f540f4 | 1904 | { |
8f2ece69 UD |
1905 | case '"': |
1906 | case '\'': | |
1907 | case 0: | |
40a55d20 | 1908 | *word = w_addchar (*word, word_length, max_length, '$'); |
8f2ece69 UD |
1909 | return *word ? 0 : WRDE_NOSPACE; |
1910 | ||
1911 | case '(': | |
1912 | if (words[2 + *offset] == '(') | |
1913 | { | |
2bcf29ba UD |
1914 | /* Differentiate between $((1+3)) and $((echo);(ls)) */ |
1915 | int i = 3 + *offset; | |
3c20b9b6 UD |
1916 | int depth = 0; |
1917 | while (words[i] && !(depth == 0 && words[i] == ')')) | |
1918 | { | |
1919 | if (words[i] == '(') | |
1920 | ++depth; | |
1921 | else if (words[i] == ')') | |
1922 | --depth; | |
1923 | ||
1924 | ++i; | |
1925 | } | |
1926 | ||
2bcf29ba UD |
1927 | if (words[i] == ')' && words[i + 1] == ')') |
1928 | { | |
1929 | (*offset) += 3; | |
1930 | /* Call parse_arith -- 0 is for "no brackets" */ | |
1931 | return parse_arith (word, word_length, max_length, words, offset, | |
1932 | flags, 0); | |
1933 | } | |
8f2ece69 UD |
1934 | } |
1935 | ||
1936 | if (flags & WRDE_NOCMD) | |
1937 | return WRDE_CMDSUB; | |
1938 | ||
1939 | (*offset) += 2; | |
40a55d20 | 1940 | return parse_comm (word, word_length, max_length, words, offset, flags, |
8d9618b7 | 1941 | quoted? NULL : pwordexp, ifs, ifs_white); |
8f2ece69 UD |
1942 | |
1943 | case '[': | |
1944 | (*offset) += 2; | |
1945 | /* Call parse_arith -- 1 is for "brackets" */ | |
40a55d20 UD |
1946 | return parse_arith (word, word_length, max_length, words, offset, flags, |
1947 | 1); | |
8f2ece69 UD |
1948 | |
1949 | case '{': | |
1950 | default: | |
1951 | ++(*offset); /* parse_param needs to know if "{" is there */ | |
40a55d20 | 1952 | return parse_param (word, word_length, max_length, words, offset, flags, |
2bcf29ba | 1953 | pwordexp, ifs, ifs_white, quoted); |
28f540f4 | 1954 | } |
8f2ece69 | 1955 | } |
28f540f4 | 1956 | |
8f2ece69 | 1957 | static int |
00995ca9 | 1958 | internal_function |
40a55d20 UD |
1959 | parse_backtick (char **word, size_t *word_length, size_t *max_length, |
1960 | const char *words, size_t *offset, int flags, | |
af69217f | 1961 | wordexp_t *pwordexp, const char *ifs, const char *ifs_white) |
8f2ece69 UD |
1962 | { |
1963 | /* We are poised just after "`" */ | |
1964 | int error; | |
8f2ece69 | 1965 | int squoting = 0; |
e9fc7bbb UD |
1966 | size_t comm_length; |
1967 | size_t comm_maxlen; | |
1968 | char *comm = w_newword (&comm_length, &comm_maxlen); | |
8f2ece69 UD |
1969 | |
1970 | for (; words[*offset]; ++(*offset)) | |
28f540f4 | 1971 | { |
8f2ece69 UD |
1972 | switch (words[*offset]) |
1973 | { | |
1974 | case '`': | |
1975 | /* Go -- give the script to the shell */ | |
40a55d20 | 1976 | error = exec_comm (comm, word, word_length, max_length, flags, |
af69217f | 1977 | pwordexp, ifs, ifs_white); |
8f2ece69 UD |
1978 | free (comm); |
1979 | return error; | |
1980 | ||
1981 | case '\\': | |
1982 | if (squoting) | |
1983 | { | |
40a55d20 UD |
1984 | error = parse_qtd_backslash (&comm, &comm_length, &comm_maxlen, |
1985 | words, offset); | |
8f2ece69 UD |
1986 | |
1987 | if (error) | |
1988 | { | |
1989 | free (comm); | |
1990 | return error; | |
1991 | } | |
1992 | ||
1993 | break; | |
1994 | } | |
1995 | ||
1996 | ++(*offset); | |
40a55d20 UD |
1997 | error = parse_backslash (&comm, &comm_length, &comm_maxlen, words, |
1998 | offset); | |
8f2ece69 UD |
1999 | |
2000 | if (error) | |
2001 | { | |
2002 | free (comm); | |
2003 | return error; | |
2004 | } | |
2005 | ||
2006 | break; | |
2007 | ||
2008 | case '\'': | |
2009 | squoting = 1 - squoting; | |
2010 | default: | |
40a55d20 | 2011 | comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]); |
8f2ece69 UD |
2012 | if (comm == NULL) |
2013 | return WRDE_NOSPACE; | |
2014 | } | |
28f540f4 RM |
2015 | } |
2016 | ||
8f2ece69 UD |
2017 | /* Premature end */ |
2018 | free (comm); | |
2019 | return WRDE_SYNTAX; | |
2020 | } | |
28f540f4 | 2021 | |
8f2ece69 | 2022 | static int |
dfd2257a | 2023 | internal_function |
40a55d20 | 2024 | parse_dquote (char **word, size_t *word_length, size_t *max_length, |
2bcf29ba UD |
2025 | const char *words, size_t *offset, int flags, |
2026 | wordexp_t *pwordexp, const char * ifs, const char * ifs_white) | |
8f2ece69 UD |
2027 | { |
2028 | /* We are poised just after a double-quote */ | |
2029 | int error; | |
2030 | ||
2031 | for (; words[*offset]; ++(*offset)) | |
2032 | { | |
2033 | switch (words[*offset]) | |
2034 | { | |
2035 | case '"': | |
2036 | return 0; | |
2037 | ||
2038 | case '$': | |
40a55d20 | 2039 | error = parse_dollars (word, word_length, max_length, words, offset, |
9b3c7c3c | 2040 | flags, pwordexp, ifs, ifs_white, 1); |
2bcf29ba UD |
2041 | /* The ``1'' here is to tell parse_dollars not to |
2042 | * split the fields. It may need to, however ("$@"). | |
8f2ece69 UD |
2043 | */ |
2044 | if (error) | |
2045 | return error; | |
28f540f4 | 2046 | |
8f2ece69 UD |
2047 | break; |
2048 | ||
2049 | case '`': | |
2050 | if (flags & WRDE_NOCMD) | |
40a55d20 | 2051 | return WRDE_CMDSUB; |
8f2ece69 UD |
2052 | |
2053 | ++(*offset); | |
40a55d20 | 2054 | error = parse_backtick (word, word_length, max_length, words, |
af69217f UD |
2055 | offset, flags, NULL, NULL, NULL); |
2056 | /* The first NULL here is to tell parse_backtick not to | |
8f2ece69 UD |
2057 | * split the fields. |
2058 | */ | |
2059 | if (error) | |
2060 | return error; | |
2061 | ||
2062 | break; | |
2063 | ||
2064 | case '\\': | |
40a55d20 UD |
2065 | error = parse_qtd_backslash (word, word_length, max_length, words, |
2066 | offset); | |
8f2ece69 UD |
2067 | |
2068 | if (error) | |
2069 | return error; | |
2070 | ||
2071 | break; | |
2072 | ||
2073 | default: | |
40a55d20 | 2074 | *word = w_addchar (*word, word_length, max_length, words[*offset]); |
8f2ece69 UD |
2075 | if (*word == NULL) |
2076 | return WRDE_NOSPACE; | |
2077 | } | |
2078 | } | |
2079 | ||
2080 | /* Unterminated string */ | |
2081 | return WRDE_SYNTAX; | |
28f540f4 RM |
2082 | } |
2083 | ||
8f2ece69 UD |
2084 | /* |
2085 | * wordfree() is to be called after pwordexp is finished with. | |
2086 | */ | |
28f540f4 RM |
2087 | |
2088 | void | |
8f2ece69 | 2089 | wordfree (wordexp_t *pwordexp) |
28f540f4 | 2090 | { |
8f2ece69 UD |
2091 | |
2092 | /* wordexp can set pwordexp to NULL */ | |
2093 | if (pwordexp && pwordexp->we_wordv) | |
2094 | { | |
2095 | char **wordv = pwordexp->we_wordv; | |
2096 | ||
2097 | for (wordv += pwordexp->we_offs; *wordv; ++wordv) | |
2098 | free (*wordv); | |
2099 | ||
2100 | free (pwordexp->we_wordv); | |
2101 | pwordexp->we_wordv = NULL; | |
2102 | } | |
2103 | } | |
2104 | ||
2105 | /* | |
2106 | * wordexp() | |
2107 | */ | |
2108 | ||
2109 | int | |
2110 | wordexp (const char *words, wordexp_t *pwordexp, int flags) | |
2111 | { | |
2112 | size_t wordv_offset; | |
2113 | size_t words_offset; | |
e9fc7bbb UD |
2114 | size_t word_length; |
2115 | size_t max_length; | |
2116 | char *word = w_newword (&word_length, &max_length); | |
40a55d20 | 2117 | int error; |
8f2ece69 UD |
2118 | char *ifs; |
2119 | char ifs_white[4]; | |
2120 | char **old_wordv = pwordexp->we_wordv; | |
2bcf29ba | 2121 | size_t old_wordc = (flags & WRDE_REUSE) ? pwordexp->we_wordc : 0; |
8f2ece69 UD |
2122 | |
2123 | if (flags & WRDE_REUSE) | |
22bc7978 UD |
2124 | { |
2125 | /* Minimal implementation of WRDE_REUSE for now */ | |
2126 | wordfree (pwordexp); | |
2127 | old_wordv = NULL; | |
2128 | } | |
8f2ece69 UD |
2129 | |
2130 | if (flags & WRDE_DOOFFS) | |
2131 | { | |
2132 | pwordexp->we_wordv = calloc (1 + pwordexp->we_offs, sizeof (char *)); | |
2133 | if (pwordexp->we_wordv == NULL) | |
33c3e20e UD |
2134 | { |
2135 | error = WRDE_NOSPACE; | |
2136 | goto do_error; | |
2137 | } | |
8f2ece69 UD |
2138 | } |
2139 | else | |
2140 | { | |
2141 | pwordexp->we_wordv = calloc (1, sizeof (char *)); | |
2142 | if (pwordexp->we_wordv == NULL) | |
33c3e20e UD |
2143 | { |
2144 | error = WRDE_NOSPACE; | |
2145 | goto do_error; | |
2146 | } | |
8f2ece69 UD |
2147 | |
2148 | pwordexp->we_offs = 0; | |
2149 | } | |
2150 | ||
2151 | if ((flags & WRDE_APPEND) == 0) | |
2152 | pwordexp->we_wordc = 0; | |
2153 | ||
2154 | wordv_offset = pwordexp->we_offs + pwordexp->we_wordc; | |
2155 | ||
2156 | /* Find out what the field separators are. | |
2157 | * There are two types: whitespace and non-whitespace. | |
2158 | */ | |
2159 | ifs = getenv ("IFS"); | |
2160 | ||
2161 | if (!ifs) | |
6796bc80 UD |
2162 | /* IFS unset - use <space><tab><newline>. */ |
2163 | ifs = strcpy (ifs_white, " \t\n"); | |
8f2ece69 UD |
2164 | else |
2165 | { | |
2166 | char *ifsch = ifs; | |
2167 | char *whch = ifs_white; | |
2168 | ||
af69217f UD |
2169 | /* Start off with no whitespace IFS characters */ |
2170 | ifs_white[0] = '\0'; | |
2171 | ||
8f2ece69 | 2172 | while (*ifsch != '\0') |
af69217f UD |
2173 | { |
2174 | if ((*ifsch == ' ') || (*ifsch == '\t') || (*ifsch == '\n')) | |
2175 | { | |
2176 | /* Whitespace IFS. See first whether it is already in our | |
2177 | collection. */ | |
2178 | char *runp = ifs_white; | |
8f2ece69 | 2179 | |
af69217f UD |
2180 | while (runp < whch && *runp != '\0' && *runp != *ifsch) |
2181 | ++runp; | |
8f2ece69 | 2182 | |
af69217f UD |
2183 | if (runp == whch) |
2184 | *whch++ = *ifsch; | |
2185 | } | |
2186 | ||
3db52d94 | 2187 | ++ifsch; |
af69217f | 2188 | } |
8f2ece69 UD |
2189 | *whch = '\0'; |
2190 | } | |
2191 | ||
9b3c7c3c | 2192 | for (words_offset = 0 ; words[words_offset] ; ++words_offset) |
8f2ece69 UD |
2193 | switch (words[words_offset]) |
2194 | { | |
8f2ece69 | 2195 | case '\\': |
40a55d20 UD |
2196 | error = parse_backslash (&word, &word_length, &max_length, words, |
2197 | &words_offset); | |
8f2ece69 UD |
2198 | |
2199 | if (error) | |
2200 | goto do_error; | |
2201 | ||
2202 | break; | |
2203 | ||
2204 | case '$': | |
40a55d20 | 2205 | error = parse_dollars (&word, &word_length, &max_length, words, |
2bcf29ba | 2206 | &words_offset, flags, pwordexp, ifs, ifs_white, |
9b3c7c3c | 2207 | 0); |
8f2ece69 UD |
2208 | |
2209 | if (error) | |
2210 | goto do_error; | |
2211 | ||
2212 | break; | |
2213 | ||
2214 | case '`': | |
2215 | if (flags & WRDE_NOCMD) | |
33c3e20e UD |
2216 | { |
2217 | error = WRDE_CMDSUB; | |
2218 | goto do_error; | |
2219 | } | |
8f2ece69 UD |
2220 | |
2221 | ++words_offset; | |
40a55d20 | 2222 | error = parse_backtick (&word, &word_length, &max_length, words, |
af69217f UD |
2223 | &words_offset, flags, pwordexp, ifs, |
2224 | ifs_white); | |
8f2ece69 UD |
2225 | |
2226 | if (error) | |
2227 | goto do_error; | |
2228 | ||
2229 | break; | |
2230 | ||
2231 | case '"': | |
2232 | ++words_offset; | |
40a55d20 | 2233 | error = parse_dquote (&word, &word_length, &max_length, words, |
2bcf29ba | 2234 | &words_offset, flags, pwordexp, ifs, ifs_white); |
8f2ece69 UD |
2235 | |
2236 | if (error) | |
2237 | goto do_error; | |
2238 | ||
2239 | break; | |
2240 | ||
2241 | case '\'': | |
2242 | ++words_offset; | |
40a55d20 UD |
2243 | error = parse_squote (&word, &word_length, &max_length, words, |
2244 | &words_offset); | |
8f2ece69 UD |
2245 | |
2246 | if (error) | |
2247 | goto do_error; | |
2248 | ||
2249 | break; | |
2250 | ||
2251 | case '~': | |
40a55d20 UD |
2252 | error = parse_tilde (&word, &word_length, &max_length, words, |
2253 | &words_offset, pwordexp->we_wordc); | |
8f2ece69 UD |
2254 | |
2255 | if (error) | |
2256 | goto do_error; | |
2257 | ||
2258 | break; | |
2259 | ||
2260 | case '*': | |
2bcf29ba UD |
2261 | case '[': |
2262 | case '?': | |
40a55d20 | 2263 | error = parse_glob (&word, &word_length, &max_length, words, |
af69217f | 2264 | &words_offset, flags, pwordexp, ifs, ifs_white); |
8f2ece69 UD |
2265 | |
2266 | if (error) | |
2267 | goto do_error; | |
2268 | ||
2269 | break; | |
2270 | ||
2271 | default: | |
c06cc21c | 2272 | /* Is it a word separator? */ |
9b3c7c3c | 2273 | if (strchr (" \t", words[words_offset]) == NULL) |
8f2ece69 | 2274 | { |
c06cc21c UD |
2275 | char ch = words[words_offset]; |
2276 | ||
2277 | /* Not a word separator -- but is it a valid word char? */ | |
2278 | if (strchr ("\n|&;<>(){}", ch)) | |
6796bc80 UD |
2279 | { |
2280 | /* Fail */ | |
bac660f8 UD |
2281 | error = WRDE_BADCHAR; |
2282 | goto do_error; | |
6796bc80 UD |
2283 | } |
2284 | ||
8f2ece69 | 2285 | /* "Ordinary" character -- add it to word */ |
40a55d20 | 2286 | word = w_addchar (word, &word_length, &max_length, |
c06cc21c | 2287 | ch); |
8f2ece69 UD |
2288 | if (word == NULL) |
2289 | { | |
2290 | error = WRDE_NOSPACE; | |
2291 | goto do_error; | |
2292 | } | |
2293 | ||
2294 | break; | |
2295 | } | |
2296 | ||
c06cc21c | 2297 | /* If a word has been delimited, add it to the list. */ |
40a55d20 | 2298 | if (word != NULL) |
8f2ece69 | 2299 | { |
9b3c7c3c | 2300 | error = w_addword (pwordexp, word); |
c06cc21c UD |
2301 | if (error) |
2302 | goto do_error; | |
8f2ece69 UD |
2303 | } |
2304 | ||
a8125d85 UD |
2305 | word = w_newword (&word_length, &max_length); |
2306 | } | |
8f2ece69 | 2307 | |
9b3c7c3c UD |
2308 | /* End of string */ |
2309 | ||
2310 | /* There was a word separator at the end */ | |
2311 | if (word == NULL) /* i.e. w_newword */ | |
2312 | return 0; | |
2313 | ||
2314 | /* There was no field separator at the end */ | |
2315 | return w_addword (pwordexp, word); | |
8f2ece69 UD |
2316 | |
2317 | do_error: | |
2318 | /* Error: | |
2bcf29ba UD |
2319 | * free memory used (unless error is WRDE_NOSPACE), and |
2320 | * set we_wordc and wd_wordv back to what they were. | |
8f2ece69 | 2321 | */ |
2bcf29ba | 2322 | |
8f2ece69 UD |
2323 | if (word != NULL) |
2324 | free (word); | |
2325 | ||
c06cc21c UD |
2326 | if (error == WRDE_NOSPACE) |
2327 | return WRDE_NOSPACE; | |
2328 | ||
8f2ece69 UD |
2329 | wordfree (pwordexp); |
2330 | pwordexp->we_wordv = old_wordv; | |
2331 | pwordexp->we_wordc = old_wordc; | |
2332 | return error; | |
28f540f4 | 2333 | } |