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 1.222 2026/05/14 18:54:27 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 file_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 file_private const char *separator = ":"; /* Default field separator */
107 file_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 file_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 { "simh", MAGIC_NO_CHECK_SIMH },
139 { "text", MAGIC_NO_CHECK_TEXT }, /* synonym for ascii */
140 { "tokens", MAGIC_NO_CHECK_TOKENS }, /* OBSOLETE: ignored for backwards compatibility */
141 };
142
143 file_private struct {
144 const char *name;
145 size_t value;
146 size_t def;
147 const char *desc;
148 int tag;
149 int set;
150 } pm[] = {
151 { "bytes", 0, FILE_BYTES_MAX, "max bytes to look inside file",
152 MAGIC_PARAM_BYTES_MAX, 0 },
153 { "elf_notes", 0, FILE_ELF_NOTES_MAX, "max ELF notes processed",
154 MAGIC_PARAM_ELF_NOTES_MAX, 0 },
155 { "elf_phnum", 0, FILE_ELF_PHNUM_MAX, "max ELF prog sections processed",
156 MAGIC_PARAM_ELF_PHNUM_MAX, 0 },
157 { "elf_shnum", 0, FILE_ELF_SHNUM_MAX, "max ELF sections processed",
158 MAGIC_PARAM_ELF_SHNUM_MAX, 0 },
159 { "elf_shsize", 0, FILE_ELF_SHSIZE_MAX, "max ELF section size",
160 MAGIC_PARAM_ELF_SHSIZE_MAX, 0 },
161 { "encoding", 0, FILE_ENCODING_MAX, "max bytes to scan for encoding",
162 MAGIC_PARAM_ENCODING_MAX, 0 },
163 { "indir", 0, FILE_INDIR_MAX, "recursion limit for indirection",
164 MAGIC_PARAM_INDIR_MAX, 0 },
165 { "name", 0, FILE_NAME_MAX, "use limit for name/use magic",
166 MAGIC_PARAM_NAME_MAX, 0 },
167 { "regex", 0, FILE_REGEX_MAX, "length limit for REGEX searches",
168 MAGIC_PARAM_REGEX_MAX, 0 },
169 { "magwarn", 0, FILE_MAGWARN_MAX, "maximum number of magic warnings",
170 MAGIC_PARAM_MAGWARN_MAX, 0 },
171 };
172
173 file_private int posixly;
174
175 #ifdef __dead
176 __dead
177 #endif
178 file_private void usage(void);
179 file_private void docprint(const char *, int);
180 #ifdef __dead
181 __dead
182 #endif
183 file_private void help(void);
184
185 file_private int unwrap(struct magic_set *, const char *);
186 file_private int process(struct magic_set *ms, const char *, int);
187 file_private struct magic_set *load(const char *, int);
188 file_private void setparam(const char *);
189 file_private void applyparam(magic_t);
190
191
192 /*
193 * main - parse arguments and handle options
194 */
195 int
main(int argc,char * argv[])196 main(int argc, char *argv[])
197 {
198 int c;
199 size_t i, j, wid, nw;
200 int action = 0, didsomefiles = 0, errflg = 0;
201 int flags = 0, e = 0;
202 #if defined(HAVE_LIBSECCOMP) || defined(HAVE_LINUX_LANDLOCK_H)
203 int sandbox = 1;
204 #endif
205 struct magic_set *magic = NULL;
206 int longindex;
207 const char *magicfile = NULL; /* where the magic is */
208 char *progname;
209
210 /* makes islower etc work for other langs */
211 (void)setlocale(LC_CTYPE, "");
212
213 #ifdef __EMX__
214 /* sh-like wildcard expansion! Shouldn't hurt at least ... */
215 _wildcard(&argc, &argv);
216 #endif
217
218 if ((progname = strrchr(argv[0], '/')) != NULL)
219 progname++;
220 else
221 progname = argv[0];
222
223 file_setprogname(progname);
224
225
226 #ifdef S_IFLNK
227 posixly = getenv("POSIXLY_CORRECT") != NULL;
228 flags |= posixly ? MAGIC_SYMLINK : 0;
229 #endif
230 while ((c = getopt_long(argc, argv, OPTSTRING, long_options,
231 &longindex)) != -1)
232 switch (c) {
233 case OPT_HELP:
234 help();
235 break;
236 case OPT_APPLE:
237 flags |= MAGIC_APPLE;
238 break;
239 case OPT_EXTENSIONS:
240 flags |= MAGIC_EXTENSION;
241 break;
242 case OPT_MIME_TYPE:
243 flags |= MAGIC_MIME_TYPE;
244 break;
245 case OPT_MIME_ENCODING:
246 flags |= MAGIC_MIME_ENCODING;
247 break;
248 case '0':
249 nulsep++;
250 break;
251 case 'b':
252 bflag++;
253 break;
254 case 'c':
255 action = FILE_CHECK;
256 break;
257 case 'C':
258 action = FILE_COMPILE;
259 break;
260 case 'd':
261 flags |= MAGIC_DEBUG|MAGIC_CHECK;
262 break;
263 case 'E':
264 flags |= MAGIC_ERROR;
265 break;
266 case 'e':
267 case OPT_EXCLUDE_QUIET:
268 for (i = 0; i < __arraycount(nv); i++)
269 if (strcmp(nv[i].name, optarg) == 0)
270 break;
271
272 if (i == __arraycount(nv)) {
273 if (c != OPT_EXCLUDE_QUIET)
274 errflg++;
275 } else
276 flags |= nv[i].value;
277 break;
278
279 case 'f':
280 if(action)
281 usage();
282 if (magic == NULL)
283 if ((magic = load(magicfile, flags)) == NULL)
284 return 1;
285 applyparam(magic);
286 e |= unwrap(magic, optarg);
287 ++didsomefiles;
288 break;
289 case 'F':
290 separator = optarg;
291 break;
292 case 'i':
293 flags |= MAGIC_MIME;
294 break;
295 case 'k':
296 flags |= MAGIC_CONTINUE;
297 break;
298 case 'l':
299 action = FILE_LIST;
300 break;
301 case 'm':
302 magicfile = optarg;
303 break;
304 case 'n':
305 ++nobuffer;
306 break;
307 case 'N':
308 ++nopad;
309 break;
310 #if defined(HAVE_UTIME) || defined(HAVE_UTIMES)
311 case 'p':
312 flags |= MAGIC_PRESERVE_ATIME;
313 break;
314 #endif
315 case 'P':
316 setparam(optarg);
317 break;
318 case 'r':
319 flags |= MAGIC_RAW;
320 break;
321 case 's':
322 flags |= MAGIC_DEVICES;
323 break;
324 case 'S':
325 #ifdef HAVE_LIBSECCOMP
326 sandbox = 0;
327 #endif
328 break;
329 case 'v':
330 if (magicfile == NULL)
331 magicfile = magic_getpath(magicfile, action);
332 (void)fprintf(stdout, "%s-%s\n", file_getprogname(),
333 VERSION);
334 (void)fprintf(stdout, "magic file from %s\n",
335 magicfile);
336 #ifdef HAVE_LIBSECCOMP
337 (void)fprintf(stdout, "seccomp support included\n");
338 #endif
339 #ifdef HAVE_LINUX_LANDLOCK_H
340 (void)fprintf(stdout, "Landlock support included\n");
341 #endif
342 return 0;
343 case 'z':
344 flags |= MAGIC_COMPRESS;
345 break;
346
347 case 'Z':
348 flags |= MAGIC_COMPRESS|MAGIC_COMPRESS_TRANSP;
349 break;
350 #ifdef S_IFLNK
351 case 'L':
352 flags |= MAGIC_SYMLINK;
353 break;
354 case 'h':
355 flags &= ~MAGIC_SYMLINK;
356 break;
357 #endif
358 case '?':
359 default:
360 errflg++;
361 break;
362 }
363
364 if (errflg) {
365 usage();
366 }
367 if (e)
368 return e;
369
370 #ifdef HAVE_LINUX_LANDLOCK_H
371 if (sandbox && enable_landlock(flags, action) == -1)
372 file_err(EXIT_FAILURE, "Landlock initialisation failed");
373 #endif /* HAVE_LINUX_LANDLOCK_H */
374
375 #ifdef HAVE_LIBSECCOMP
376 if (sandbox && enable_sandbox(flags, action) == -1)
377 file_err(EXIT_FAILURE, "SECCOMP initialisation failed");
378 if (sandbox)
379 flags |= MAGIC_NO_COMPRESS_FORK;
380 #endif /* HAVE_LIBSECCOMP */
381
382 if (MAGIC_VERSION != magic_version())
383 file_warnx("Compiled magic version [%d] "
384 "does not match with shared library magic version [%d]\n",
385 MAGIC_VERSION, magic_version());
386
387 switch(action) {
388 case FILE_CHECK:
389 case FILE_COMPILE:
390 case FILE_LIST:
391 /*
392 * Don't try to check/compile ~/.magic unless we explicitly
393 * ask for it.
394 */
395 magic = magic_open(flags|MAGIC_CHECK);
396 if (magic == NULL) {
397 file_warn("Can't create magic");
398 return 1;
399 }
400
401
402 switch(action) {
403 case FILE_CHECK:
404 c = magic_check(magic, magicfile);
405 break;
406 case FILE_COMPILE:
407 c = magic_compile(magic, magicfile);
408 break;
409 case FILE_LIST:
410 c = magic_list(magic, magicfile);
411 break;
412 default:
413 abort();
414 }
415 if (c == -1) {
416 file_warnx("%s", magic_error(magic));
417 e = 1;
418 goto out;
419 }
420 goto out;
421 default:
422 if (magic == NULL)
423 if ((magic = load(magicfile, flags)) == NULL)
424 return 1;
425 applyparam(magic);
426 }
427
428 if (optind == argc) {
429 if (!didsomefiles)
430 usage();
431 goto out;
432 }
433
434 for (wid = 0, j = CAST(size_t, optind); j < CAST(size_t, argc);
435 j++) {
436 nw = file_mbswidth(magic, argv[j]);
437 if (nw > wid)
438 wid = nw;
439 }
440
441 /*
442 * If bflag is only set twice, set it depending on
443 * number of files [this is undocumented, and subject to change]
444 */
445 if (bflag == 2) {
446 bflag = optind >= argc - 1;
447 }
448 for (; optind < argc; optind++)
449 e |= process(magic, argv[optind], wid);
450
451 out:
452 if (!nobuffer)
453 e |= fflush(stdout) != 0;
454
455 if (magic)
456 magic_close(magic);
457 return e;
458 }
459
460 file_private void
applyparam(magic_t magic)461 applyparam(magic_t magic)
462 {
463 size_t i;
464
465 for (i = 0; i < __arraycount(pm); i++) {
466 if (!pm[i].set)
467 continue;
468 if (magic_setparam(magic, pm[i].tag, &pm[i].value) == -1)
469 file_err(EXIT_FAILURE, "Can't set %s", pm[i].name);
470 }
471 }
472
473 file_private void
setparam(const char * p)474 setparam(const char *p)
475 {
476 size_t i;
477 ssize_t mpar;
478 int par;
479 char *s;
480
481 if ((s = CCAST(char *, strchr(p, '='))) == NULL)
482 goto badparm;
483
484 for (i = 0; i < __arraycount(pm); i++) {
485 if (strncmp(p, pm[i].name, s - p) != 0)
486 continue;
487 par = atoi(s + 1);
488 mpar = magic_getmaxparam(pm[i].tag);
489 if (par < 0 || par > mpar)
490 file_err(EXIT_FAILURE, "Out of bounds value %d for %s",
491 par, pm[i].name);
492 pm[i].value = par;
493 pm[i].set = 1;
494 return;
495 }
496 badparm:
497 file_errx(EXIT_FAILURE, "Unknown param %s", p);
498 }
499
500 file_private struct magic_set *
501 /*ARGSUSED*/
load(const char * magicfile,int flags)502 load(const char *magicfile, int flags)
503 {
504 struct magic_set *magic = magic_open(flags);
505 const char *e;
506
507 if (magic == NULL) {
508 file_warn("Can't create magic");
509 return NULL;
510 }
511 if (magic_load(magic, magicfile) == -1) {
512 file_warn("%s", magic_error(magic));
513 magic_close(magic);
514 return NULL;
515 }
516 if ((e = magic_error(magic)) != NULL)
517 file_warn("%s", e);
518 return magic;
519 }
520
521 /*
522 * unwrap -- read a file of filenames, do each one.
523 */
524 file_private int
unwrap(struct magic_set * ms,const char * fn)525 unwrap(struct magic_set *ms, const char *fn)
526 {
527 FILE *f;
528 ssize_t len;
529 char *line = NULL;
530 size_t llen = 0;
531 int wid = 0, cwid;
532 int e = 0;
533 size_t fi = 0, fimax = 0;
534 char **flist = NULL;
535
536 if (strcmp("-", fn) == 0)
537 f = stdin;
538 else {
539 if ((f = fopen(fn, "r")) == NULL) {
540 file_warn("Cannot open `%s'", fn);
541 return 1;
542 }
543 }
544
545 while ((len = getline(&line, &llen, f)) > 0) {
546 if (line[len - 1] == '\n')
547 line[len - 1] = '\0';
548 cwid = file_mbswidth(ms, line);
549 if (nobuffer) {
550 e |= process(ms, line, cwid);
551 free(line);
552 line = NULL;
553 llen = 0;
554 continue;
555 }
556 if (cwid > wid)
557 wid = cwid;
558 if (fi >= fimax) {
559 fimax += 100;
560 char **nf = CAST(char **,
561 realloc(flist, fimax * sizeof(*flist)));
562 if (nf == NULL) {
563 file_err(EXIT_FAILURE,
564 "Cannot allocate memory for file list");
565 }
566 flist = nf;
567 }
568 flist[fi++] = line;
569 line = NULL;
570 llen = 0;
571 }
572
573 if (!nobuffer) {
574 fimax = fi;
575 for (fi = 0; fi < fimax; fi++) {
576 e |= process(ms, flist[fi], wid);
577 free(flist[fi]);
578 }
579 }
580 free(flist);
581
582 if (f != stdin)
583 (void)fclose(f);
584 return e;
585 }
586
587 file_private void
file_octal(unsigned char c)588 file_octal(unsigned char c)
589 {
590 (void)putc('\\', stdout);
591 (void)putc(((c >> 6) & 7) + '0', stdout);
592 (void)putc(((c >> 3) & 7) + '0', stdout);
593 (void)putc(((c >> 0) & 7) + '0', stdout);
594 }
595
596 file_private void
fname_print(const char * inname)597 fname_print(const char *inname)
598 {
599 size_t n = strlen(inname);
600 #ifdef FILE_WIDE_SUPPORT
601 mbstate_t state;
602 wchar_t nextchar;
603 size_t bytesconsumed;
604
605
606 (void)memset(&state, 0, sizeof(state));
607 while (n > 0) {
608 bytesconsumed = mbrtowc(&nextchar, inname, n, &state);
609 if (bytesconsumed == CAST(size_t, -1) ||
610 bytesconsumed == CAST(size_t, -2)) {
611 nextchar = *inname++;
612 n--;
613 (void)memset(&state, 0, sizeof(state));
614 file_octal(CAST(unsigned char, nextchar));
615 continue;
616 }
617 inname += bytesconsumed;
618 n -= bytesconsumed;
619 if (iswprint(nextchar)) {
620 printf("%lc", (wint_t)nextchar);
621 continue;
622 }
623 /* XXX: What if it is > 255? */
624 file_octal(CAST(unsigned char, nextchar));
625 }
626 #else
627 size_t i;
628 for (i = 0; i < n; i++) {
629 unsigned char c = CAST(unsigned char, inname[i]);
630 if (isprint(c)) {
631 (void)putc(c, stdout);
632 continue;
633 }
634 file_octal(c);
635 }
636 #endif
637 }
638
639 /*
640 * Called for each input file on the command line (or in a list of files)
641 */
642 file_private int
process(struct magic_set * ms,const char * inname,int wid)643 process(struct magic_set *ms, const char *inname, int wid)
644 {
645 const char *type, c = nulsep > 1 ? '\0' : '\n';
646 int std_in = strcmp(inname, "-") == 0;
647 int haderror = 0;
648
649 if (wid > 0 && !bflag) {
650 const char *pname = std_in ? "/dev/stdin" : inname;
651 if ((ms->flags & MAGIC_RAW) == 0)
652 fname_print(pname);
653 else
654 (void)printf("%s", pname);
655 if (nulsep)
656 (void)putc('\0', stdout);
657 if (nulsep < 2) {
658 (void)printf("%s", separator);
659 (void)printf("%*s ", CAST(int, nopad ? 0
660 : (wid - file_mbswidth(ms, inname))), "");
661 }
662 }
663
664 type = magic_file(ms, std_in ? NULL : inname);
665
666 if (type == NULL) {
667 haderror |= printf("ERROR: %s%c", magic_error(ms), c);
668 } else {
669 haderror |= printf("%s%c", type, c) < 0;
670 }
671 if (nobuffer)
672 haderror |= fflush(stdout) != 0;
673 return haderror || type == NULL;
674 }
675
676 file_protected size_t
file_mbswidth(struct magic_set * ms,const char * s)677 file_mbswidth(struct magic_set *ms, const char *s)
678 {
679 size_t width = 0;
680 #ifdef FILE_WIDE_SUPPORT
681 size_t bytesconsumed, n;
682 mbstate_t state;
683 wchar_t nextchar;
684
685 (void)memset(&state, 0, sizeof(state));
686 n = strlen(s);
687
688 while (n > 0) {
689 bytesconsumed = mbrtowc(&nextchar, s, n, &state);
690 if (bytesconsumed == CAST(size_t, -1) ||
691 bytesconsumed == CAST(size_t, -2)) {
692 nextchar = *s;
693 bytesconsumed = 1;
694 (void)memset(&state, 0, sizeof(state));
695 width += 4;
696 } else {
697 int w = wcwidth(nextchar);
698 width += ((ms->flags & MAGIC_RAW) != 0
699 || iswprint(nextchar)) ? (w > 0 ? w : 1) : 4;
700 }
701
702 s += bytesconsumed, n -= bytesconsumed;
703 }
704 #else
705 for (; *s; s++) {
706 width += (ms->flags & MAGIC_RAW) != 0
707 || isprint(CAST(unsigned char, *s)) ? 1 : 4;
708 }
709 #endif
710 return width;
711 }
712
713 file_private void
usage(void)714 usage(void)
715 {
716 const char *pn = file_getprogname();
717 (void)fprintf(stderr, USAGE, pn, pn, pn);
718 exit(EXIT_FAILURE);
719 }
720
721 file_private void
defprint(int def)722 defprint(int def)
723 {
724 if (!def)
725 return;
726 if (((def & 1) && posixly) || ((def & 2) && !posixly))
727 (void)fprintf(stdout, " (default)");
728 (void)putc('\n', stdout);
729 }
730
731 file_private void
docprint(const char * opts,int def)732 docprint(const char *opts, int def)
733 {
734 size_t i;
735 int comma, pad;
736 char *sp, *p;
737
738 p = CCAST(char *, strchr(opts, '%'));
739 if (p == NULL) {
740 (void)fprintf(stdout, "%s", opts);
741 defprint(def);
742 return;
743 }
744
745 for (sp = p - 1; sp > opts && *sp == ' '; sp--)
746 continue;
747
748 (void)printf("%.*s", CAST(int, p - opts), opts);
749 pad = (int)CAST(int, p - sp - 1);
750
751 switch (*++p) {
752 case 'e':
753 comma = 0;
754 for (i = 0; i < __arraycount(nv); i++) {
755 (void)printf("%s%s", comma++ ? ", " : "", nv[i].name);
756 if (i && i % 5 == 0 && i != __arraycount(nv) - 1) {
757 (void)printf(",\n%*s", pad, "");
758 comma = 0;
759 }
760 }
761 break;
762 case 'P':
763 for (i = 0; i < __arraycount(pm); i++) {
764 (void)printf("%9s %7zu %s", pm[i].name, pm[i].def,
765 pm[i].desc);
766 if (i != __arraycount(pm) - 1)
767 (void)printf("\n%*s", pad, "");
768 }
769 break;
770 default:
771 file_errx(EXIT_FAILURE, "Unknown escape `%c' in long options",
772 *p);
773 break;
774 }
775 (void)printf("%s", opts + (p - opts) + 1);
776
777 }
778
779 file_private void
help(void)780 help(void)
781 {
782 (void)fputs(
783 "Usage: file [OPTION...] [FILE...]\n"
784 "Determine type of FILEs.\n"
785 "\n", stdout);
786 #define OPT(shortname, longname, opt, def, doc) \
787 (void)printf(" -%c, --" longname, shortname), \
788 docprint(doc, def);
789 #define OPT_LONGONLY(longname, opt, def, doc, id) \
790 (void)printf(" --" longname), \
791 docprint(doc, def);
792 #include "file_opts.h"
793 #undef OPT
794 #undef OPT_LONGONLY
795 (void)printf("\nReport bugs to https://bugs.astron.com/\n");
796 exit(EXIT_SUCCESS);
797 }
798
799 file_private const char *file_progname;
800
801 file_protected void
file_setprogname(const char * progname)802 file_setprogname(const char *progname)
803 {
804 file_progname = progname;
805 }
806
807 file_protected const char *
file_getprogname(void)808 file_getprogname(void)
809 {
810 return file_progname;
811 }
812
813 file_protected void
file_err(int e,const char * fmt,...)814 file_err(int e, const char *fmt, ...)
815 {
816 va_list ap;
817 int se = errno;
818
819 va_start(ap, fmt);
820 (void)fprintf(stderr, "%s: ", file_progname);
821 (void)vfprintf(stderr, fmt, ap);
822 va_end(ap);
823 if (se)
824 (void)fprintf(stderr, " (%s)\n", strerror(se));
825 else
826 fputc('\n', stderr);
827 exit(e);
828 }
829
830 file_protected void
file_errx(int e,const char * fmt,...)831 file_errx(int e, const char *fmt, ...)
832 {
833 va_list ap;
834
835 va_start(ap, fmt);
836 (void)fprintf(stderr, "%s: ", file_progname);
837 (void)vfprintf(stderr, fmt, ap);
838 va_end(ap);
839 (void)fprintf(stderr, "\n");
840 exit(e);
841 }
842
843 file_protected void
file_warn(const char * fmt,...)844 file_warn(const char *fmt, ...)
845 {
846 va_list ap;
847 int se = errno;
848
849 va_start(ap, fmt);
850 (void)fprintf(stderr, "%s: ", file_progname);
851 (void)vfprintf(stderr, fmt, ap);
852 va_end(ap);
853 if (se)
854 (void)fprintf(stderr, " (%s)\n", strerror(se));
855 else
856 fputc('\n', stderr);
857 errno = se;
858 }
859
860 file_protected void
file_warnx(const char * fmt,...)861 file_warnx(const char *fmt, ...)
862 {
863 va_list ap;
864 int se = errno;
865
866 va_start(ap, fmt);
867 (void)fprintf(stderr, "%s: ", file_progname);
868 (void)vfprintf(stderr, fmt, ap);
869 va_end(ap);
870 (void)fprintf(stderr, "\n");
871 errno = se;
872 }
873