1 /*
2 * Copyright (c) Ian F. Darwin 1986-1995.
3 * Software written by Ian F. Darwin and others;
4 * maintained 1995-present by Christos Zoulas and others.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice immediately at the beginning of the file, without modification,
11 * this list of conditions, and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28 /*
29 * file - find type of a file or files - main program.
30 */
31
32 #include "file.h"
33
34 #ifndef lint
35 FILE_RCSID("@(#)$File: file.c,v 1.204 2022/09/13 18:46:07 christos Exp $")
36 #endif /* lint */
37
38 #include "magic.h"
39
40 #include <stdlib.h>
41 #include <unistd.h>
42 #include <string.h>
43 #ifdef RESTORE_TIME
44 # if (__COHERENT__ >= 0x420)
45 # include <sys/utime.h>
46 # else
47 # ifdef USE_UTIMES
48 # include <sys/time.h>
49 # else
50 # include <utime.h>
51 # endif
52 # endif
53 #endif
54 #ifdef HAVE_UNISTD_H
55 #include <unistd.h> /* for read() */
56 #endif
57 #ifdef HAVE_WCHAR_H
58 #include <wchar.h>
59 #endif
60 #ifdef HAVE_WCTYPE_H
61 #include <wctype.h>
62 #endif
63 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH) && \
64 defined(HAVE_WCTYPE_H)
65 #define FILE_WIDE_SUPPORT
66 #else
67 #include <ctype.h>
68 #endif
69
70 #if defined(HAVE_GETOPT_H) && defined(HAVE_STRUCT_OPTION)
71 # include <getopt.h>
72 # ifndef HAVE_GETOPT_LONG
73 int getopt_long(int, char * const *, const char *,
74 const struct option *, int *);
75 # endif
76 # else
77 # include "mygetopt.h"
78 #endif
79
80 #ifdef S_IFLNK
81 # define IFLNK_h "h"
82 # define IFLNK_L "L"
83 #else
84 # define IFLNK_h ""
85 # define IFLNK_L ""
86 #endif
87
88 #define FILE_FLAGS "bcCdE" IFLNK_h "ik" IFLNK_L "lNnprsSvzZ0"
89 #define OPTSTRING "bcCde:Ef:F:hiklLm:nNpP:rsSvzZ0"
90
91 # define USAGE \
92 "Usage: %s [-" FILE_FLAGS "] [--apple] [--extension] [--mime-encoding]\n" \
93 " [--mime-type] [-e <testname>] [-F <separator>] " \
94 " [-f <namefile>]\n" \
95 " [-m <magicfiles>] [-P <parameter=value>] [--exclude-quiet]\n" \
96 " <file> ...\n" \
97 " %s -C [-m <magicfiles>]\n" \
98 " %s [--help]\n"
99
100 private int /* Global command-line options */
101 bflag = 0, /* brief output format */
102 nopad = 0, /* Don't pad output */
103 nobuffer = 0, /* Do not buffer stdout */
104 nulsep = 0; /* Append '\0' to the separator */
105
106 private const char *separator = ":"; /* Default field separator */
107 private const struct option long_options[] = {
108 #define OPT_HELP 1
109 #define OPT_APPLE 2
110 #define OPT_EXTENSIONS 3
111 #define OPT_MIME_TYPE 4
112 #define OPT_MIME_ENCODING 5
113 #define OPT_EXCLUDE_QUIET 6
114 #define OPT(shortname, longname, opt, def, doc) \
115 {longname, opt, NULL, shortname},
116 #define OPT_LONGONLY(longname, opt, def, doc, id) \
117 {longname, opt, NULL, id},
118 #include "file_opts.h"
119 #undef OPT
120 #undef OPT_LONGONLY
121 {0, 0, NULL, 0}
122 };
123
124 private const struct {
125 const char *name;
126 int value;
127 } nv[] = {
128 { "apptype", MAGIC_NO_CHECK_APPTYPE },
129 { "ascii", MAGIC_NO_CHECK_ASCII },
130 { "cdf", MAGIC_NO_CHECK_CDF },
131 { "compress", MAGIC_NO_CHECK_COMPRESS },
132 { "csv", MAGIC_NO_CHECK_CSV },
133 { "elf", MAGIC_NO_CHECK_ELF },
134 { "encoding", MAGIC_NO_CHECK_ENCODING },
135 { "soft", MAGIC_NO_CHECK_SOFT },
136 { "tar", MAGIC_NO_CHECK_TAR },
137 { "json", MAGIC_NO_CHECK_JSON },
138 { "text", MAGIC_NO_CHECK_TEXT }, /* synonym for ascii */
139 { "tokens", MAGIC_NO_CHECK_TOKENS }, /* OBSOLETE: ignored for backwards compatibility */
140 };
141
142 private struct {
143 const char *name;
144 size_t value;
145 size_t def;
146 const char *desc;
147 int tag;
148 int set;
149 } pm[] = {
150 { "bytes", 0, FILE_BYTES_MAX, "max bytes to look inside file",
151 MAGIC_PARAM_BYTES_MAX, 0 },
152 { "elf_notes", 0, FILE_ELF_NOTES_MAX, "max ELF notes processed",
153 MAGIC_PARAM_ELF_NOTES_MAX, 0 },
154 { "elf_phnum", 0, FILE_ELF_PHNUM_MAX, "max ELF prog sections processed",
155 MAGIC_PARAM_ELF_PHNUM_MAX, 0 },
156 { "elf_shnum", 0, FILE_ELF_SHNUM_MAX, "max ELF sections processed",
157 MAGIC_PARAM_ELF_SHNUM_MAX, 0 },
158 { "encoding", 0, FILE_ENCODING_MAX, "max bytes to scan for encoding",
159 MAGIC_PARAM_ENCODING_MAX, 0 },
160 { "indir", 0, FILE_INDIR_MAX, "recursion limit for indirection",
161 MAGIC_PARAM_INDIR_MAX, 0 },
162 { "name", 0, FILE_NAME_MAX, "use limit for name/use magic",
163 MAGIC_PARAM_NAME_MAX, 0 },
164 { "regex", 0, FILE_REGEX_MAX, "length limit for REGEX searches",
165 MAGIC_PARAM_REGEX_MAX, 0 },
166 };
167
168 private int posixly;
169
170 #ifdef __dead
171 __dead
172 #endif
173 private void usage(void);
174 private void docprint(const char *, int);
175 #ifdef __dead
176 __dead
177 #endif
178 private void help(void);
179
180 private int unwrap(struct magic_set *, const char *);
181 private int process(struct magic_set *ms, const char *, int);
182 private struct magic_set *load(const char *, int);
183 private void setparam(const char *);
184 private void applyparam(magic_t);
185
186
187 /*
188 * main - parse arguments and handle options
189 */
190 int
main(int argc,char * argv[])191 main(int argc, char *argv[])
192 {
193 int c;
194 size_t i, j, wid, nw;
195 int action = 0, didsomefiles = 0, errflg = 0;
196 int flags = 0, e = 0;
197 #ifdef HAVE_LIBSECCOMP
198 int sandbox = 1;
199 #endif
200 struct magic_set *magic = NULL;
201 int longindex;
202 const char *magicfile = NULL; /* where the magic is */
203 char *progname;
204
205 /* makes islower etc work for other langs */
206 (void)setlocale(LC_CTYPE, "");
207
208 #ifdef __EMX__
209 /* sh-like wildcard expansion! Shouldn't hurt at least ... */
210 _wildcard(&argc, &argv);
211 #endif
212
213 if ((progname = strrchr(argv[0], '/')) != NULL)
214 progname++;
215 else
216 progname = argv[0];
217
218 file_setprogname(progname);
219
220
221 #ifdef S_IFLNK
222 posixly = getenv("POSIXLY_CORRECT") != NULL;
223 flags |= posixly ? MAGIC_SYMLINK : 0;
224 #endif
225 while ((c = getopt_long(argc, argv, OPTSTRING, long_options,
226 &longindex)) != -1)
227 switch (c) {
228 case OPT_HELP:
229 help();
230 break;
231 case OPT_APPLE:
232 flags |= MAGIC_APPLE;
233 break;
234 case OPT_EXTENSIONS:
235 flags |= MAGIC_EXTENSION;
236 break;
237 case OPT_MIME_TYPE:
238 flags |= MAGIC_MIME_TYPE;
239 break;
240 case OPT_MIME_ENCODING:
241 flags |= MAGIC_MIME_ENCODING;
242 break;
243 case '0':
244 nulsep++;
245 break;
246 case 'b':
247 bflag++;
248 break;
249 case 'c':
250 action = FILE_CHECK;
251 break;
252 case 'C':
253 action = FILE_COMPILE;
254 break;
255 case 'd':
256 flags |= MAGIC_DEBUG|MAGIC_CHECK;
257 break;
258 case 'E':
259 flags |= MAGIC_ERROR;
260 break;
261 case 'e':
262 case OPT_EXCLUDE_QUIET:
263 for (i = 0; i < __arraycount(nv); i++)
264 if (strcmp(nv[i].name, optarg) == 0)
265 break;
266
267 if (i == __arraycount(nv)) {
268 if (c != OPT_EXCLUDE_QUIET)
269 errflg++;
270 } else
271 flags |= nv[i].value;
272 break;
273
274 case 'f':
275 if(action)
276 usage();
277 if (magic == NULL)
278 if ((magic = load(magicfile, flags)) == NULL)
279 return 1;
280 applyparam(magic);
281 e |= unwrap(magic, optarg);
282 ++didsomefiles;
283 break;
284 case 'F':
285 separator = optarg;
286 break;
287 case 'i':
288 flags |= MAGIC_MIME;
289 break;
290 case 'k':
291 flags |= MAGIC_CONTINUE;
292 break;
293 case 'l':
294 action = FILE_LIST;
295 break;
296 case 'm':
297 magicfile = optarg;
298 break;
299 case 'n':
300 ++nobuffer;
301 break;
302 case 'N':
303 ++nopad;
304 break;
305 #if defined(HAVE_UTIME) || defined(HAVE_UTIMES)
306 case 'p':
307 flags |= MAGIC_PRESERVE_ATIME;
308 break;
309 #endif
310 case 'P':
311 setparam(optarg);
312 break;
313 case 'r':
314 flags |= MAGIC_RAW;
315 break;
316 case 's':
317 flags |= MAGIC_DEVICES;
318 break;
319 case 'S':
320 #ifdef HAVE_LIBSECCOMP
321 sandbox = 0;
322 #endif
323 break;
324 case 'v':
325 if (magicfile == NULL)
326 magicfile = magic_getpath(magicfile, action);
327 (void)fprintf(stdout, "%s-%s\n", file_getprogname(),
328 VERSION);
329 (void)fprintf(stdout, "magic file from %s\n",
330 magicfile);
331 #ifdef HAVE_LIBSECCOMP
332 (void)fprintf(stdout, "seccomp support included\n");
333 #endif
334 return 0;
335 case 'z':
336 flags |= MAGIC_COMPRESS;
337 break;
338
339 case 'Z':
340 flags |= MAGIC_COMPRESS|MAGIC_COMPRESS_TRANSP;
341 break;
342 #ifdef S_IFLNK
343 case 'L':
344 flags |= MAGIC_SYMLINK;
345 break;
346 case 'h':
347 flags &= ~MAGIC_SYMLINK;
348 break;
349 #endif
350 case '?':
351 default:
352 errflg++;
353 break;
354 }
355
356 if (errflg) {
357 usage();
358 }
359 if (e)
360 return e;
361
362 #ifdef HAVE_LIBSECCOMP
363 #if 0
364 if (sandbox && enable_sandbox_basic() == -1)
365 #else
366 if (sandbox && enable_sandbox_full() == -1)
367 #endif
368 file_err(EXIT_FAILURE, "SECCOMP initialisation failed");
369 #endif /* HAVE_LIBSECCOMP */
370
371 if (MAGIC_VERSION != magic_version())
372 file_warnx("Compiled magic version [%d] "
373 "does not match with shared library magic version [%d]\n",
374 MAGIC_VERSION, magic_version());
375
376 switch(action) {
377 case FILE_CHECK:
378 case FILE_COMPILE:
379 case FILE_LIST:
380 /*
381 * Don't try to check/compile ~/.magic unless we explicitly
382 * ask for it.
383 */
384 magic = magic_open(flags|MAGIC_CHECK);
385 if (magic == NULL) {
386 file_warn("Can't create magic");
387 return 1;
388 }
389
390
391 switch(action) {
392 case FILE_CHECK:
393 c = magic_check(magic, magicfile);
394 break;
395 case FILE_COMPILE:
396 c = magic_compile(magic, magicfile);
397 break;
398 case FILE_LIST:
399 c = magic_list(magic, magicfile);
400 break;
401 default:
402 abort();
403 }
404 if (c == -1) {
405 file_warnx("%s", magic_error(magic));
406 e = 1;
407 goto out;
408 }
409 goto out;
410 default:
411 if (magic == NULL)
412 if ((magic = load(magicfile, flags)) == NULL)
413 return 1;
414 applyparam(magic);
415 }
416
417 if (optind == argc) {
418 if (!didsomefiles)
419 usage();
420 goto out;
421 }
422
423 for (wid = 0, j = CAST(size_t, optind); j < CAST(size_t, argc);
424 j++) {
425 nw = file_mbswidth(magic, argv[j]);
426 if (nw > wid)
427 wid = nw;
428 }
429
430 /*
431 * If bflag is only set twice, set it depending on
432 * number of files [this is undocumented, and subject to change]
433 */
434 if (bflag == 2) {
435 bflag = optind >= argc - 1;
436 }
437 for (; optind < argc; optind++)
438 e |= process(magic, argv[optind], wid);
439
440 out:
441 if (!nobuffer)
442 e |= fflush(stdout) != 0;
443
444 if (magic)
445 magic_close(magic);
446 return e;
447 }
448
449 private void
applyparam(magic_t magic)450 applyparam(magic_t magic)
451 {
452 size_t i;
453
454 for (i = 0; i < __arraycount(pm); i++) {
455 if (!pm[i].set)
456 continue;
457 if (magic_setparam(magic, pm[i].tag, &pm[i].value) == -1)
458 file_err(EXIT_FAILURE, "Can't set %s", pm[i].name);
459 }
460 }
461
462 private void
setparam(const char * p)463 setparam(const char *p)
464 {
465 size_t i;
466 char *s;
467
468 if ((s = CCAST(char *, strchr(p, '='))) == NULL)
469 goto badparm;
470
471 for (i = 0; i < __arraycount(pm); i++) {
472 if (strncmp(p, pm[i].name, s - p) != 0)
473 continue;
474 pm[i].value = atoi(s + 1);
475 pm[i].set = 1;
476 return;
477 }
478 badparm:
479 file_errx(EXIT_FAILURE, "Unknown param %s", p);
480 }
481
482 private struct magic_set *
483 /*ARGSUSED*/
load(const char * magicfile,int flags)484 load(const char *magicfile, int flags)
485 {
486 struct magic_set *magic = magic_open(flags);
487 const char *e;
488
489 if (magic == NULL) {
490 file_warn("Can't create magic");
491 return NULL;
492 }
493 if (magic_load(magic, magicfile) == -1) {
494 file_warn("%s", magic_error(magic));
495 magic_close(magic);
496 return NULL;
497 }
498 if ((e = magic_error(magic)) != NULL)
499 file_warn("%s", e);
500 return magic;
501 }
502
503 /*
504 * unwrap -- read a file of filenames, do each one.
505 */
506 private int
unwrap(struct magic_set * ms,const char * fn)507 unwrap(struct magic_set *ms, const char *fn)
508 {
509 FILE *f;
510 ssize_t len;
511 char *line = NULL;
512 size_t llen = 0;
513 int wid = 0, cwid;
514 int e = 0;
515 size_t fi = 0, fimax = 100;
516 char **flist = CAST(char **, malloc(sizeof(*flist) * fimax));
517
518 if (flist == NULL)
519 out: file_err(EXIT_FAILURE, "Cannot allocate memory for file list");
520
521 if (strcmp("-", fn) == 0)
522 f = stdin;
523 else {
524 if ((f = fopen(fn, "r")) == NULL) {
525 file_warn("Cannot open `%s'", fn);
526 return 1;
527 }
528 }
529
530 while ((len = getline(&line, &llen, f)) > 0) {
531 if (line[len - 1] == '\n')
532 line[len - 1] = '\0';
533 if (fi >= fimax) {
534 fimax += 100;
535 char **nf = CAST(char **,
536 realloc(flist, fimax * sizeof(*flist)));
537 if (nf == NULL)
538 goto out;
539 flist = nf;
540 }
541 flist[fi++] = line;
542 cwid = file_mbswidth(ms, line);
543 if (cwid > wid)
544 wid = cwid;
545 line = NULL;
546 llen = 0;
547 }
548
549 fimax = fi;
550 for (fi = 0; fi < fimax; fi++) {
551 e |= process(ms, flist[fi], wid);
552 free(flist[fi]);
553 }
554 free(flist);
555
556 if (f != stdin)
557 (void)fclose(f);
558 return e;
559 }
560
561 private void
file_octal(unsigned char c)562 file_octal(unsigned char c)
563 {
564 putc('\\', stdout);
565 putc(((c >> 6) & 7) + '0', stdout);
566 putc(((c >> 3) & 7) + '0', stdout);
567 putc(((c >> 0) & 7) + '0', stdout);
568 }
569
570 private void
fname_print(const char * inname)571 fname_print(const char *inname)
572 {
573 size_t n = strlen(inname);
574 #ifdef FILE_WIDE_SUPPORT
575 mbstate_t state;
576 wchar_t nextchar;
577 size_t bytesconsumed;
578
579
580 (void)memset(&state, 0, sizeof(state));
581 while (n > 0) {
582 bytesconsumed = mbrtowc(&nextchar, inname, n, &state);
583 if (bytesconsumed == CAST(size_t, -1) ||
584 bytesconsumed == CAST(size_t, -2)) {
585 nextchar = *inname++;
586 n--;
587 (void)memset(&state, 0, sizeof(state));
588 file_octal(CAST(unsigned char, nextchar));
589 continue;
590 }
591 inname += bytesconsumed;
592 n -= bytesconsumed;
593 if (iswprint(nextchar)) {
594 printf("%lc", nextchar);
595 continue;
596 }
597 /* XXX: What if it is > 255? */
598 file_octal(CAST(unsigned char, nextchar));
599 }
600 #else
601 size_t i;
602 for (i = 0; i < n; i++) {
603 unsigned char c = CAST(unsigned char, inname[i]);
604 if (isprint(c)) {
605 putc(c);
606 continue;
607 }
608 file_octal(c);
609 }
610 #endif
611 }
612
613 /*
614 * Called for each input file on the command line (or in a list of files)
615 */
616 private int
process(struct magic_set * ms,const char * inname,int wid)617 process(struct magic_set *ms, const char *inname, int wid)
618 {
619 const char *type, c = nulsep > 1 ? '\0' : '\n';
620 int std_in = strcmp(inname, "-") == 0;
621 int haderror = 0;
622
623 if (wid > 0 && !bflag) {
624 const char *pname = std_in ? "/dev/stdin" : inname;
625 if ((ms->flags & MAGIC_RAW) == 0)
626 fname_print(pname);
627 else
628 (void)printf("%s", pname);
629 if (nulsep)
630 (void)putc('\0', stdout);
631 if (nulsep < 2) {
632 (void)printf("%s", separator);
633 (void)printf("%*s ", CAST(int, nopad ? 0
634 : (wid - file_mbswidth(ms, inname))), "");
635 }
636 }
637
638 type = magic_file(ms, std_in ? NULL : inname);
639
640 if (type == NULL) {
641 haderror |= printf("ERROR: %s%c", magic_error(ms), c);
642 } else {
643 haderror |= printf("%s%c", type, c) < 0;
644 }
645 if (nobuffer)
646 haderror |= fflush(stdout) != 0;
647 return haderror || type == NULL;
648 }
649
650 protected size_t
file_mbswidth(struct magic_set * ms,const char * s)651 file_mbswidth(struct magic_set *ms, const char *s)
652 {
653 size_t width = 0;
654 #ifdef FILE_WIDE_SUPPORT
655 size_t bytesconsumed, n;
656 mbstate_t state;
657 wchar_t nextchar;
658
659 (void)memset(&state, 0, sizeof(state));
660 n = strlen(s);
661
662 while (n > 0) {
663 bytesconsumed = mbrtowc(&nextchar, s, n, &state);
664 if (bytesconsumed == CAST(size_t, -1) ||
665 bytesconsumed == CAST(size_t, -2)) {
666 nextchar = *s;
667 bytesconsumed = 1;
668 (void)memset(&state, 0, sizeof(state));
669 width += 4;
670 } else {
671 int w = wcwidth(nextchar);
672 width += ((ms->flags & MAGIC_RAW) != 0
673 || iswprint(nextchar)) ? (w > 0 ? w : 1) : 4;
674 }
675
676 s += bytesconsumed, n -= bytesconsumed;
677 }
678 #else
679 for (; *s; s++) {
680 width += (ms->flags & MAGIC_RAW) != 0
681 || isprint(CAST(unsigned char, *s)) ? 1 : 4;
682 }
683 #endif
684 return width;
685 }
686
687 private void
usage(void)688 usage(void)
689 {
690 const char *pn = file_getprogname();
691 (void)fprintf(stderr, USAGE, pn, pn, pn);
692 exit(EXIT_FAILURE);
693 }
694
695 private void
defprint(int def)696 defprint(int def)
697 {
698 if (!def)
699 return;
700 if (((def & 1) && posixly) || ((def & 2) && !posixly))
701 fprintf(stdout, " (default)");
702 fputc('\n', stdout);
703 }
704
705 private void
docprint(const char * opts,int def)706 docprint(const char *opts, int def)
707 {
708 size_t i;
709 int comma, pad;
710 char *sp, *p;
711
712 p = CCAST(char *, strchr(opts, '%'));
713 if (p == NULL) {
714 fprintf(stdout, "%s", opts);
715 defprint(def);
716 return;
717 }
718
719 for (sp = p - 1; sp > opts && *sp == ' '; sp--)
720 continue;
721
722 fprintf(stdout, "%.*s", CAST(int, p - opts), opts);
723 pad = (int)CAST(int, p - sp - 1);
724
725 switch (*++p) {
726 case 'e':
727 comma = 0;
728 for (i = 0; i < __arraycount(nv); i++) {
729 fprintf(stdout, "%s%s", comma++ ? ", " : "", nv[i].name);
730 if (i && i % 5 == 0 && i != __arraycount(nv) - 1) {
731 fprintf(stdout, ",\n%*s", pad, "");
732 comma = 0;
733 }
734 }
735 break;
736 case 'P':
737 for (i = 0; i < __arraycount(pm); i++) {
738 fprintf(stdout, "%9s %7zu %s", pm[i].name, pm[i].def,
739 pm[i].desc);
740 if (i != __arraycount(pm) - 1)
741 fprintf(stdout, "\n%*s", pad, "");
742 }
743 break;
744 default:
745 file_errx(EXIT_FAILURE, "Unknown escape `%c' in long options",
746 *p);
747 break;
748 }
749 fprintf(stdout, "%s", opts + (p - opts) + 1);
750
751 }
752
753 private void
help(void)754 help(void)
755 {
756 (void)fputs(
757 "Usage: file [OPTION...] [FILE...]\n"
758 "Determine type of FILEs.\n"
759 "\n", stdout);
760 #define OPT(shortname, longname, opt, def, doc) \
761 fprintf(stdout, " -%c, --" longname, shortname), \
762 docprint(doc, def);
763 #define OPT_LONGONLY(longname, opt, def, doc, id) \
764 fprintf(stdout, " --" longname), \
765 docprint(doc, def);
766 #include "file_opts.h"
767 #undef OPT
768 #undef OPT_LONGONLY
769 fprintf(stdout, "\nReport bugs to https://bugs.astron.com/\n");
770 exit(EXIT_SUCCESS);
771 }
772
773 private const char *file_progname;
774
775 protected void
file_setprogname(const char * progname)776 file_setprogname(const char *progname)
777 {
778 file_progname = progname;
779 }
780
781 protected const char *
file_getprogname(void)782 file_getprogname(void)
783 {
784 return file_progname;
785 }
786
787 protected void
file_err(int e,const char * fmt,...)788 file_err(int e, const char *fmt, ...)
789 {
790 va_list ap;
791 int se = errno;
792
793 va_start(ap, fmt);
794 fprintf(stderr, "%s: ", file_progname);
795 vfprintf(stderr, fmt, ap);
796 va_end(ap);
797 if (se)
798 fprintf(stderr, " (%s)\n", strerror(se));
799 else
800 fputc('\n', stderr);
801 exit(e);
802 }
803
804 protected void
file_errx(int e,const char * fmt,...)805 file_errx(int e, const char *fmt, ...)
806 {
807 va_list ap;
808
809 va_start(ap, fmt);
810 fprintf(stderr, "%s: ", file_progname);
811 vfprintf(stderr, fmt, ap);
812 va_end(ap);
813 fprintf(stderr, "\n");
814 exit(e);
815 }
816
817 protected void
file_warn(const char * fmt,...)818 file_warn(const char *fmt, ...)
819 {
820 va_list ap;
821 int se = errno;
822
823 va_start(ap, fmt);
824 fprintf(stderr, "%s: ", file_progname);
825 vfprintf(stderr, fmt, ap);
826 va_end(ap);
827 if (se)
828 fprintf(stderr, " (%s)\n", strerror(se));
829 else
830 fputc('\n', stderr);
831 errno = se;
832 }
833
834 protected void
file_warnx(const char * fmt,...)835 file_warnx(const char *fmt, ...)
836 {
837 va_list ap;
838 int se = errno;
839
840 va_start(ap, fmt);
841 fprintf(stderr, "%s: ", file_progname);
842 vfprintf(stderr, fmt, ap);
843 va_end(ap);
844 fprintf(stderr, "\n");
845 errno = se;
846 }
847