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