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6599da04 | 1 | /* Create and destroy argument vectors (argv's) |
85ec4feb | 2 | Copyright (C) 1992-2018 Free Software Foundation, Inc. |
6599da04 JM |
3 | Written by Fred Fish @ Cygnus Support |
4 | ||
5 | This file is part of the libiberty library. | |
6 | Libiberty is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Library General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2 of the License, or (at your option) any later version. | |
10 | ||
11 | Libiberty 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. | |
15 | ||
16 | You should have received a copy of the GNU Library General Public | |
17 | License along with libiberty; see the file COPYING.LIB. If | |
ee58dffd NC |
18 | not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, |
19 | Boston, MA 02110-1301, USA. */ | |
6599da04 JM |
20 | |
21 | ||
22 | /* Create and destroy argument vectors. An argument vector is simply an | |
23 | array of string pointers, terminated by a NULL pointer. */ | |
24 | ||
3c60ae5a GDR |
25 | #ifdef HAVE_CONFIG_H |
26 | #include "config.h" | |
27 | #endif | |
6599da04 JM |
28 | #include "ansidecl.h" |
29 | #include "libiberty.h" | |
97393d0a | 30 | #include "safe-ctype.h" |
6599da04 JM |
31 | |
32 | /* Routines imported from standard C runtime libraries. */ | |
33 | ||
6599da04 | 34 | #include <stddef.h> |
a81c752a RH |
35 | #include <string.h> |
36 | #include <stdlib.h> | |
97393d0a | 37 | #include <stdio.h> |
2207ff5d DD |
38 | #include <sys/types.h> |
39 | #ifdef HAVE_UNISTD_H | |
40 | #include <unistd.h> | |
41 | #endif | |
42 | #if HAVE_SYS_STAT_H | |
43 | #include <sys/stat.h> | |
44 | #endif | |
6599da04 | 45 | |
6599da04 JM |
46 | #ifndef NULL |
47 | #define NULL 0 | |
48 | #endif | |
49 | ||
50 | #ifndef EOS | |
51 | #define EOS '\0' | |
52 | #endif | |
53 | ||
54 | #define INITIAL_MAXARGC 8 /* Number of args + NULL in initial argv */ | |
55 | ||
56 | ||
19ddc834 JM |
57 | /* |
58 | ||
66f49f07 | 59 | @deftypefn Extension char** dupargv (char * const *@var{vector}) |
19ddc834 | 60 | |
aac04c15 DD |
61 | Duplicate an argument vector. Simply scans through @var{vector}, |
62 | duplicating each argument until the terminating @code{NULL} is found. | |
5bed56d9 | 63 | Returns a pointer to the argument vector if successful. Returns |
aac04c15 DD |
64 | @code{NULL} if there is insufficient memory to complete building the |
65 | argument vector. | |
19ddc834 | 66 | |
aac04c15 | 67 | @end deftypefn |
19ddc834 JM |
68 | |
69 | */ | |
70 | ||
71 | char ** | |
66f49f07 | 72 | dupargv (char * const *argv) |
19ddc834 JM |
73 | { |
74 | int argc; | |
75 | char **copy; | |
76 | ||
77 | if (argv == NULL) | |
78 | return NULL; | |
79 | ||
80 | /* the vector */ | |
81 | for (argc = 0; argv[argc] != NULL; argc++); | |
fabfa16b L |
82 | copy = (char **) xmalloc ((argc + 1) * sizeof (char *)); |
83 | ||
19ddc834 JM |
84 | /* the strings */ |
85 | for (argc = 0; argv[argc] != NULL; argc++) | |
ae120683 | 86 | copy[argc] = xstrdup (argv[argc]); |
19ddc834 JM |
87 | copy[argc] = NULL; |
88 | return copy; | |
89 | } | |
90 | ||
6599da04 JM |
91 | /* |
92 | ||
aac04c15 | 93 | @deftypefn Extension void freeargv (char **@var{vector}) |
6599da04 | 94 | |
aac04c15 DD |
95 | Free an argument vector that was built using @code{buildargv}. Simply |
96 | scans through @var{vector}, freeing the memory for each argument until | |
97 | the terminating @code{NULL} is found, and then frees @var{vector} | |
98 | itself. | |
6599da04 | 99 | |
aac04c15 | 100 | @end deftypefn |
6599da04 JM |
101 | |
102 | */ | |
103 | ||
9486db4f | 104 | void freeargv (char **vector) |
6599da04 JM |
105 | { |
106 | register char **scan; | |
107 | ||
108 | if (vector != NULL) | |
109 | { | |
110 | for (scan = vector; *scan != NULL; scan++) | |
111 | { | |
112 | free (*scan); | |
113 | } | |
114 | free (vector); | |
115 | } | |
116 | } | |
117 | ||
70277b30 DG |
118 | static void |
119 | consume_whitespace (const char **input) | |
120 | { | |
121 | while (ISSPACE (**input)) | |
122 | { | |
123 | (*input)++; | |
124 | } | |
125 | } | |
126 | ||
127 | static int | |
128 | only_whitespace (const char* input) | |
129 | { | |
130 | while (*input != EOS && ISSPACE (*input)) | |
131 | input++; | |
132 | ||
133 | return (*input == EOS); | |
134 | } | |
135 | ||
6599da04 JM |
136 | /* |
137 | ||
aac04c15 | 138 | @deftypefn Extension char** buildargv (char *@var{sp}) |
6599da04 | 139 | |
aac04c15 DD |
140 | Given a pointer to a string, parse the string extracting fields |
141 | separated by whitespace and optionally enclosed within either single | |
142 | or double quotes (which are stripped off), and build a vector of | |
143 | pointers to copies of the string for each field. The input string | |
144 | remains unchanged. The last element of the vector is followed by a | |
145 | @code{NULL} element. | |
6599da04 | 146 | |
aac04c15 | 147 | All of the memory for the pointer array and copies of the string |
fabfa16b | 148 | is obtained from @code{xmalloc}. All of the memory can be returned to the |
aac04c15 DD |
149 | system with the single function call @code{freeargv}, which takes the |
150 | returned result of @code{buildargv}, as it's argument. | |
6599da04 | 151 | |
5bed56d9 | 152 | Returns a pointer to the argument vector if successful. Returns |
aac04c15 DD |
153 | @code{NULL} if @var{sp} is @code{NULL} or if there is insufficient |
154 | memory to complete building the argument vector. | |
6599da04 | 155 | |
aac04c15 DD |
156 | If the input is a null string (as opposed to a @code{NULL} pointer), |
157 | then buildarg returns an argument vector that has one arg, a null | |
158 | string. | |
6599da04 | 159 | |
aac04c15 | 160 | @end deftypefn |
6599da04 | 161 | |
aac04c15 | 162 | The memory for the argv array is dynamically expanded as necessary. |
6599da04 | 163 | |
aac04c15 DD |
164 | In order to provide a working buffer for extracting arguments into, |
165 | with appropriate stripping of quotes and translation of backslash | |
166 | sequences, we allocate a working buffer at least as long as the input | |
167 | string. This ensures that we always have enough space in which to | |
168 | work, since the extracted arg is never larger than the input string. | |
6599da04 | 169 | |
aac04c15 DD |
170 | The argument vector is always kept terminated with a @code{NULL} arg |
171 | pointer, so it can be passed to @code{freeargv} at any time, or | |
172 | returned, as appropriate. | |
6599da04 | 173 | |
6599da04 JM |
174 | */ |
175 | ||
9486db4f | 176 | char **buildargv (const char *input) |
6599da04 JM |
177 | { |
178 | char *arg; | |
179 | char *copybuf; | |
180 | int squote = 0; | |
181 | int dquote = 0; | |
182 | int bsquote = 0; | |
183 | int argc = 0; | |
184 | int maxargc = 0; | |
185 | char **argv = NULL; | |
186 | char **nargv; | |
187 | ||
188 | if (input != NULL) | |
189 | { | |
55529d36 | 190 | copybuf = (char *) xmalloc (strlen (input) + 1); |
6599da04 JM |
191 | /* Is a do{}while to always execute the loop once. Always return an |
192 | argv, even for null strings. See NOTES above, test case below. */ | |
193 | do | |
194 | { | |
195 | /* Pick off argv[argc] */ | |
70277b30 DG |
196 | consume_whitespace (&input); |
197 | ||
6599da04 JM |
198 | if ((maxargc == 0) || (argc >= (maxargc - 1))) |
199 | { | |
200 | /* argv needs initialization, or expansion */ | |
201 | if (argv == NULL) | |
202 | { | |
203 | maxargc = INITIAL_MAXARGC; | |
fabfa16b | 204 | nargv = (char **) xmalloc (maxargc * sizeof (char *)); |
6599da04 JM |
205 | } |
206 | else | |
207 | { | |
208 | maxargc *= 2; | |
fabfa16b | 209 | nargv = (char **) xrealloc (argv, maxargc * sizeof (char *)); |
6599da04 JM |
210 | } |
211 | argv = nargv; | |
212 | argv[argc] = NULL; | |
213 | } | |
214 | /* Begin scanning arg */ | |
215 | arg = copybuf; | |
216 | while (*input != EOS) | |
217 | { | |
97393d0a | 218 | if (ISSPACE (*input) && !squote && !dquote && !bsquote) |
6599da04 JM |
219 | { |
220 | break; | |
221 | } | |
222 | else | |
223 | { | |
224 | if (bsquote) | |
225 | { | |
226 | bsquote = 0; | |
227 | *arg++ = *input; | |
228 | } | |
229 | else if (*input == '\\') | |
230 | { | |
231 | bsquote = 1; | |
232 | } | |
233 | else if (squote) | |
234 | { | |
235 | if (*input == '\'') | |
236 | { | |
237 | squote = 0; | |
238 | } | |
239 | else | |
240 | { | |
241 | *arg++ = *input; | |
242 | } | |
243 | } | |
244 | else if (dquote) | |
245 | { | |
246 | if (*input == '"') | |
247 | { | |
248 | dquote = 0; | |
249 | } | |
250 | else | |
251 | { | |
252 | *arg++ = *input; | |
253 | } | |
254 | } | |
255 | else | |
256 | { | |
257 | if (*input == '\'') | |
258 | { | |
259 | squote = 1; | |
260 | } | |
261 | else if (*input == '"') | |
262 | { | |
263 | dquote = 1; | |
264 | } | |
265 | else | |
266 | { | |
267 | *arg++ = *input; | |
268 | } | |
269 | } | |
270 | input++; | |
271 | } | |
272 | } | |
273 | *arg = EOS; | |
fabfa16b | 274 | argv[argc] = xstrdup (copybuf); |
6599da04 JM |
275 | argc++; |
276 | argv[argc] = NULL; | |
277 | ||
70277b30 | 278 | consume_whitespace (&input); |
6599da04 JM |
279 | } |
280 | while (*input != EOS); | |
55529d36 L |
281 | |
282 | free (copybuf); | |
6599da04 JM |
283 | } |
284 | return (argv); | |
285 | } | |
286 | ||
97393d0a MM |
287 | /* |
288 | ||
66f49f07 | 289 | @deftypefn Extension int writeargv (char * const *@var{argv}, FILE *@var{file}) |
2091ff66 NF |
290 | |
291 | Write each member of ARGV, handling all necessary quoting, to the file | |
292 | named by FILE, separated by whitespace. Return 0 on success, non-zero | |
293 | if an error occurred while writing to FILE. | |
294 | ||
295 | @end deftypefn | |
296 | ||
297 | */ | |
298 | ||
299 | int | |
66f49f07 | 300 | writeargv (char * const *argv, FILE *f) |
2091ff66 NF |
301 | { |
302 | int status = 0; | |
303 | ||
304 | if (f == NULL) | |
305 | return 1; | |
306 | ||
307 | while (*argv != NULL) | |
308 | { | |
2091ff66 NF |
309 | const char *arg = *argv; |
310 | ||
311 | while (*arg != EOS) | |
312 | { | |
313 | char c = *arg; | |
314 | ||
315 | if (ISSPACE(c) || c == '\\' || c == '\'' || c == '"') | |
316 | if (EOF == fputc ('\\', f)) | |
317 | { | |
318 | status = 1; | |
319 | goto done; | |
320 | } | |
321 | ||
322 | if (EOF == fputc (c, f)) | |
323 | { | |
324 | status = 1; | |
325 | goto done; | |
326 | } | |
327 | arg++; | |
328 | } | |
329 | ||
330 | if (EOF == fputc ('\n', f)) | |
331 | { | |
332 | status = 1; | |
333 | goto done; | |
334 | } | |
335 | argv++; | |
336 | } | |
337 | ||
338 | done: | |
339 | return status; | |
340 | } | |
341 | ||
342 | /* | |
343 | ||
97393d0a MM |
344 | @deftypefn Extension void expandargv (int *@var{argcp}, char ***@var{argvp}) |
345 | ||
346 | The @var{argcp} and @code{argvp} arguments are pointers to the usual | |
347 | @code{argc} and @code{argv} arguments to @code{main}. This function | |
348 | looks for arguments that begin with the character @samp{@@}. Any such | |
349 | arguments are interpreted as ``response files''. The contents of the | |
350 | response file are interpreted as additional command line options. In | |
351 | particular, the file is separated into whitespace-separated strings; | |
352 | each such string is taken as a command-line option. The new options | |
353 | are inserted in place of the option naming the response file, and | |
354 | @code{*argcp} and @code{*argvp} will be updated. If the value of | |
355 | @code{*argvp} is modified by this function, then the new value has | |
356 | been dynamically allocated and can be deallocated by the caller with | |
357 | @code{freeargv}. However, most callers will simply call | |
358 | @code{expandargv} near the beginning of @code{main} and allow the | |
359 | operating system to free the memory when the program exits. | |
360 | ||
361 | @end deftypefn | |
362 | ||
363 | */ | |
364 | ||
365 | void | |
017133fd | 366 | expandargv (int *argcp, char ***argvp) |
97393d0a MM |
367 | { |
368 | /* The argument we are currently processing. */ | |
369 | int i = 0; | |
3ec62f54 DG |
370 | /* To check if ***argvp has been dynamically allocated. */ |
371 | char ** const original_argv = *argvp; | |
ec760bea NC |
372 | /* Limit the number of response files that we parse in order |
373 | to prevent infinite recursion. */ | |
374 | unsigned int iteration_limit = 2000; | |
97393d0a MM |
375 | /* Loop over the arguments, handling response files. We always skip |
376 | ARGVP[0], as that is the name of the program being run. */ | |
377 | while (++i < *argcp) | |
378 | { | |
379 | /* The name of the response file. */ | |
380 | const char *filename; | |
381 | /* The response file. */ | |
382 | FILE *f; | |
974c2c56 CD |
383 | /* An upper bound on the number of characters in the response |
384 | file. */ | |
97393d0a | 385 | long pos; |
974c2c56 CD |
386 | /* The number of characters in the response file, when actually |
387 | read. */ | |
388 | size_t len; | |
97393d0a MM |
389 | /* A dynamically allocated buffer used to hold options read from a |
390 | response file. */ | |
391 | char *buffer; | |
392 | /* Dynamically allocated storage for the options read from the | |
393 | response file. */ | |
394 | char **file_argv; | |
395 | /* The number of options read from the response file, if any. */ | |
974c2c56 | 396 | size_t file_argc; |
2207ff5d DD |
397 | #ifdef S_ISDIR |
398 | struct stat sb; | |
399 | #endif | |
97393d0a MM |
400 | /* We are only interested in options of the form "@file". */ |
401 | filename = (*argvp)[i]; | |
402 | if (filename[0] != '@') | |
403 | continue; | |
ec760bea NC |
404 | /* If we have iterated too many times then stop. */ |
405 | if (-- iteration_limit == 0) | |
406 | { | |
407 | fprintf (stderr, "%s: error: too many @-files encountered\n", (*argvp)[0]); | |
408 | xexit (1); | |
409 | } | |
2207ff5d DD |
410 | #ifdef S_ISDIR |
411 | if (stat (filename+1, &sb) < 0) | |
412 | continue; | |
413 | if (S_ISDIR(sb.st_mode)) | |
414 | { | |
415 | fprintf (stderr, "%s: error: @-file refers to a directory\n", (*argvp)[0]); | |
416 | xexit (1); | |
417 | } | |
418 | #endif | |
97393d0a MM |
419 | /* Read the contents of the file. */ |
420 | f = fopen (++filename, "r"); | |
421 | if (!f) | |
422 | continue; | |
423 | if (fseek (f, 0L, SEEK_END) == -1) | |
424 | goto error; | |
425 | pos = ftell (f); | |
426 | if (pos == -1) | |
427 | goto error; | |
428 | if (fseek (f, 0L, SEEK_SET) == -1) | |
429 | goto error; | |
430 | buffer = (char *) xmalloc (pos * sizeof (char) + 1); | |
974c2c56 CD |
431 | len = fread (buffer, sizeof (char), pos, f); |
432 | if (len != (size_t) pos | |
433 | /* On Windows, fread may return a value smaller than POS, | |
434 | due to CR/LF->CR translation when reading text files. | |
435 | That does not in-and-of itself indicate failure. */ | |
436 | && ferror (f)) | |
97393d0a MM |
437 | goto error; |
438 | /* Add a NUL terminator. */ | |
974c2c56 | 439 | buffer[len] = '\0'; |
70277b30 DG |
440 | /* If the file is empty or contains only whitespace, buildargv would |
441 | return a single empty argument. In this context we want no arguments, | |
442 | instead. */ | |
443 | if (only_whitespace (buffer)) | |
444 | { | |
445 | file_argv = (char **) xmalloc (sizeof (char *)); | |
446 | file_argv[0] = NULL; | |
447 | } | |
448 | else | |
449 | /* Parse the string. */ | |
450 | file_argv = buildargv (buffer); | |
97393d0a | 451 | /* If *ARGVP is not already dynamically allocated, copy it. */ |
3ec62f54 | 452 | if (*argvp == original_argv) |
fabfa16b | 453 | *argvp = dupargv (*argvp); |
97393d0a MM |
454 | /* Count the number of arguments. */ |
455 | file_argc = 0; | |
70277b30 | 456 | while (file_argv[file_argc]) |
97393d0a | 457 | ++file_argc; |
d6df811e DG |
458 | /* Free the original option's memory. */ |
459 | free ((*argvp)[i]); | |
97393d0a MM |
460 | /* Now, insert FILE_ARGV into ARGV. The "+1" below handles the |
461 | NULL terminator at the end of ARGV. */ | |
462 | *argvp = ((char **) | |
463 | xrealloc (*argvp, | |
464 | (*argcp + file_argc + 1) * sizeof (char *))); | |
465 | memmove (*argvp + i + file_argc, *argvp + i + 1, | |
466 | (*argcp - i) * sizeof (char *)); | |
467 | memcpy (*argvp + i, file_argv, file_argc * sizeof (char *)); | |
468 | /* The original option has been replaced by all the new | |
469 | options. */ | |
470 | *argcp += file_argc - 1; | |
471 | /* Free up memory allocated to process the response file. We do | |
472 | not use freeargv because the individual options in FILE_ARGV | |
473 | are now in the main ARGV. */ | |
474 | free (file_argv); | |
475 | free (buffer); | |
476 | /* Rescan all of the arguments just read to support response | |
477 | files that include other response files. */ | |
478 | --i; | |
479 | error: | |
480 | /* We're all done with the file now. */ | |
481 | fclose (f); | |
482 | } | |
483 | } | |
484 | ||
be50fcea DE |
485 | /* |
486 | ||
66f49f07 | 487 | @deftypefn Extension int countargv (char * const *@var{argv}) |
be50fcea DE |
488 | |
489 | Return the number of elements in @var{argv}. | |
490 | Returns zero if @var{argv} is NULL. | |
491 | ||
492 | @end deftypefn | |
493 | ||
494 | */ | |
495 | ||
496 | int | |
66f49f07 | 497 | countargv (char * const *argv) |
be50fcea DE |
498 | { |
499 | int argc; | |
500 | ||
501 | if (argv == NULL) | |
502 | return 0; | |
503 | for (argc = 0; argv[argc] != NULL; argc++) | |
504 | continue; | |
505 | return argc; | |
506 | } | |
507 | ||
6599da04 JM |
508 | #ifdef MAIN |
509 | ||
510 | /* Simple little test driver. */ | |
511 | ||
0be6abca | 512 | static const char *const tests[] = |
6599da04 JM |
513 | { |
514 | "a simple command line", | |
515 | "arg 'foo' is single quoted", | |
516 | "arg \"bar\" is double quoted", | |
517 | "arg \"foo bar\" has embedded whitespace", | |
518 | "arg 'Jack said \\'hi\\'' has single quotes", | |
519 | "arg 'Jack said \\\"hi\\\"' has double quotes", | |
520 | "a b c d e f g h i j k l m n o p q r s t u v w x y z 1 2 3 4 5 6 7 8 9", | |
521 | ||
522 | /* This should be expanded into only one argument. */ | |
523 | "trailing-whitespace ", | |
524 | ||
525 | "", | |
526 | NULL | |
527 | }; | |
528 | ||
9486db4f GDR |
529 | int |
530 | main (void) | |
6599da04 JM |
531 | { |
532 | char **argv; | |
0be6abca | 533 | const char *const *test; |
6599da04 JM |
534 | char **targs; |
535 | ||
536 | for (test = tests; *test != NULL; test++) | |
537 | { | |
538 | printf ("buildargv(\"%s\")\n", *test); | |
539 | if ((argv = buildargv (*test)) == NULL) | |
540 | { | |
541 | printf ("failed!\n\n"); | |
542 | } | |
543 | else | |
544 | { | |
545 | for (targs = argv; *targs != NULL; targs++) | |
546 | { | |
547 | printf ("\t\"%s\"\n", *targs); | |
548 | } | |
549 | printf ("\n"); | |
550 | } | |
551 | freeargv (argv); | |
552 | } | |
553 | ||
0be6abca | 554 | return 0; |
6599da04 JM |
555 | } |
556 | ||
557 | #endif /* MAIN */ |