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 1.217 2024/09/29 16:49:25 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 #ifdef HAVE_LIBSECCOMP
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 return 0;
340 case 'z':
341 flags |= MAGIC_COMPRESS;
342 break;
343
344 case 'Z':
345 flags |= MAGIC_COMPRESS|MAGIC_COMPRESS_TRANSP;
346 break;
347 #ifdef S_IFLNK
348 case 'L':
349 flags |= MAGIC_SYMLINK;
350 break;
351 case 'h':
352 flags &= ~MAGIC_SYMLINK;
353 break;
354 #endif
355 case '?':
356 default:
357 errflg++;
358 break;
359 }
360
361 if (errflg) {
362 usage();
363 }
364 if (e)
365 return e;
366
367 #ifdef HAVE_LIBSECCOMP
368 if (sandbox && enable_sandbox() == -1)
369 file_err(EXIT_FAILURE, "SECCOMP initialisation failed");
370 if (sandbox)
371 flags |= MAGIC_NO_COMPRESS_FORK;
372 #endif /* HAVE_LIBSECCOMP */
373
374 if (MAGIC_VERSION != magic_version())
375 file_warnx("Compiled magic version [%d] "
376 "does not match with shared library magic version [%d]\n",
377 MAGIC_VERSION, magic_version());
378
379 switch(action) {
380 case FILE_CHECK:
381 case FILE_COMPILE:
382 case FILE_LIST:
383 /*
384 * Don't try to check/compile ~/.magic unless we explicitly
385 * ask for it.
386 */
387 magic = magic_open(flags|MAGIC_CHECK);
388 if (magic == NULL) {
389 file_warn("Can't create magic");
390 return 1;
391 }
392
393
394 switch(action) {
395 case FILE_CHECK:
396 c = magic_check(magic, magicfile);
397 break;
398 case FILE_COMPILE:
399 c = magic_compile(magic, magicfile);
400 break;
401 case FILE_LIST:
402 c = magic_list(magic, magicfile);
403 break;
404 default:
405 abort();
406 }
407 if (c == -1) {
408 file_warnx("%s", magic_error(magic));
409 e = 1;
410 goto out;
411 }
412 goto out;
413 default:
414 if (magic == NULL)
415 if ((magic = load(magicfile, flags)) == NULL)
416 return 1;
417 applyparam(magic);
418 }
419
420 if (optind == argc) {
421 if (!didsomefiles)
422 usage();
423 goto out;
424 }
425
426 for (wid = 0, j = CAST(size_t, optind); j < CAST(size_t, argc);
427 j++) {
428 nw = file_mbswidth(magic, argv[j]);
429 if (nw > wid)
430 wid = nw;
431 }
432
433 /*
434 * If bflag is only set twice, set it depending on
435 * number of files [this is undocumented, and subject to change]
436 */
437 if (bflag == 2) {
438 bflag = optind >= argc - 1;
439 }
440 for (; optind < argc; optind++)
441 e |= process(magic, argv[optind], wid);
442
443 out:
444 if (!nobuffer)
445 e |= fflush(stdout) != 0;
446
447 if (magic)
448 magic_close(magic);
449 return e;
450 }
451
452 file_private void
applyparam(magic_t magic)453 applyparam(magic_t magic)
454 {
455 size_t i;
456
457 for (i = 0; i < __arraycount(pm); i++) {
458 if (!pm[i].set)
459 continue;
460 if (magic_setparam(magic, pm[i].tag, &pm[i].value) == -1)
461 file_err(EXIT_FAILURE, "Can't set %s", pm[i].name);
462 }
463 }
464
465 file_private void
setparam(const char * p)466 setparam(const char *p)
467 {
468 size_t i;
469 char *s;
470
471 if ((s = CCAST(char *, strchr(p, '='))) == NULL)
472 goto badparm;
473
474 for (i = 0; i < __arraycount(pm); i++) {
475 if (strncmp(p, pm[i].name, s - p) != 0)
476 continue;
477 pm[i].value = atoi(s + 1);
478 pm[i].set = 1;
479 return;
480 }
481 badparm:
482 file_errx(EXIT_FAILURE, "Unknown param %s", p);
483 }
484
485 file_private struct magic_set *
486 /*ARGSUSED*/
load(const char * magicfile,int flags)487 load(const char *magicfile, int flags)
488 {
489 struct magic_set *magic = magic_open(flags);
490 const char *e;
491
492 if (magic == NULL) {
493 file_warn("Can't create magic");
494 return NULL;
495 }
496 if (magic_load(magic, magicfile) == -1) {
497 file_warn("%s", magic_error(magic));
498 magic_close(magic);
499 return NULL;
500 }
501 if ((e = magic_error(magic)) != NULL)
502 file_warn("%s", e);
503 return magic;
504 }
505
506 /*
507 * unwrap -- read a file of filenames, do each one.
508 */
509 file_private int
unwrap(struct magic_set * ms,const char * fn)510 unwrap(struct magic_set *ms, const char *fn)
511 {
512 FILE *f;
513 ssize_t len;
514 char *line = NULL;
515 size_t llen = 0;
516 int wid = 0, cwid;
517 int e = 0;
518 size_t fi = 0, fimax = 0;
519 char **flist = NULL;
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 cwid = file_mbswidth(ms, line);
534 if (nobuffer) {
535 e |= process(ms, line, cwid);
536 free(line);
537 line = NULL;
538 llen = 0;
539 continue;
540 }
541 if (cwid > wid)
542 wid = cwid;
543 if (fi >= fimax) {
544 fimax += 100;
545 char **nf = CAST(char **,
546 realloc(flist, fimax * sizeof(*flist)));
547 if (nf == NULL) {
548 file_err(EXIT_FAILURE,
549 "Cannot allocate memory for file list");
550 }
551 flist = nf;
552 }
553 flist[fi++] = line;
554 line = NULL;
555 llen = 0;
556 }
557
558 if (!nobuffer) {
559 fimax = fi;
560 for (fi = 0; fi < fimax; fi++) {
561 e |= process(ms, flist[fi], wid);
562 free(flist[fi]);
563 }
564 }
565 free(flist);
566
567 if (f != stdin)
568 (void)fclose(f);
569 return e;
570 }
571
572 file_private void
file_octal(unsigned char c)573 file_octal(unsigned char c)
574 {
575 (void)putc('\\', stdout);
576 (void)putc(((c >> 6) & 7) + '0', stdout);
577 (void)putc(((c >> 3) & 7) + '0', stdout);
578 (void)putc(((c >> 0) & 7) + '0', stdout);
579 }
580
581 file_private void
fname_print(const char * inname)582 fname_print(const char *inname)
583 {
584 size_t n = strlen(inname);
585 #ifdef FILE_WIDE_SUPPORT
586 mbstate_t state;
587 wchar_t nextchar;
588 size_t bytesconsumed;
589
590
591 (void)memset(&state, 0, sizeof(state));
592 while (n > 0) {
593 bytesconsumed = mbrtowc(&nextchar, inname, n, &state);
594 if (bytesconsumed == CAST(size_t, -1) ||
595 bytesconsumed == CAST(size_t, -2)) {
596 nextchar = *inname++;
597 n--;
598 (void)memset(&state, 0, sizeof(state));
599 file_octal(CAST(unsigned char, nextchar));
600 continue;
601 }
602 inname += bytesconsumed;
603 n -= bytesconsumed;
604 if (iswprint(nextchar)) {
605 printf("%lc", (wint_t)nextchar);
606 continue;
607 }
608 /* XXX: What if it is > 255? */
609 file_octal(CAST(unsigned char, nextchar));
610 }
611 #else
612 size_t i;
613 for (i = 0; i < n; i++) {
614 unsigned char c = CAST(unsigned char, inname[i]);
615 if (isprint(c)) {
616 (void)putc(c, stdout);
617 continue;
618 }
619 file_octal(c);
620 }
621 #endif
622 }
623
624 /*
625 * Called for each input file on the command line (or in a list of files)
626 */
627 file_private int
process(struct magic_set * ms,const char * inname,int wid)628 process(struct magic_set *ms, const char *inname, int wid)
629 {
630 const char *type, c = nulsep > 1 ? '\0' : '\n';
631 int std_in = strcmp(inname, "-") == 0;
632 int haderror = 0;
633
634 if (wid > 0 && !bflag) {
635 const char *pname = std_in ? "/dev/stdin" : inname;
636 if ((ms->flags & MAGIC_RAW) == 0)
637 fname_print(pname);
638 else
639 (void)printf("%s", pname);
640 if (nulsep)
641 (void)putc('\0', stdout);
642 if (nulsep < 2) {
643 (void)printf("%s", separator);
644 (void)printf("%*s ", CAST(int, nopad ? 0
645 : (wid - file_mbswidth(ms, inname))), "");
646 }
647 }
648
649 type = magic_file(ms, std_in ? NULL : inname);
650
651 if (type == NULL) {
652 haderror |= printf("ERROR: %s%c", magic_error(ms), c);
653 } else {
654 haderror |= printf("%s%c", type, c) < 0;
655 }
656 if (nobuffer)
657 haderror |= fflush(stdout) != 0;
658 return haderror || type == NULL;
659 }
660
661 file_protected size_t
file_mbswidth(struct magic_set * ms,const char * s)662 file_mbswidth(struct magic_set *ms, const char *s)
663 {
664 size_t width = 0;
665 #ifdef FILE_WIDE_SUPPORT
666 size_t bytesconsumed, n;
667 mbstate_t state;
668 wchar_t nextchar;
669
670 (void)memset(&state, 0, sizeof(state));
671 n = strlen(s);
672
673 while (n > 0) {
674 bytesconsumed = mbrtowc(&nextchar, s, n, &state);
675 if (bytesconsumed == CAST(size_t, -1) ||
676 bytesconsumed == CAST(size_t, -2)) {
677 nextchar = *s;
678 bytesconsumed = 1;
679 (void)memset(&state, 0, sizeof(state));
680 width += 4;
681 } else {
682 int w = wcwidth(nextchar);
683 width += ((ms->flags & MAGIC_RAW) != 0
684 || iswprint(nextchar)) ? (w > 0 ? w : 1) : 4;
685 }
686
687 s += bytesconsumed, n -= bytesconsumed;
688 }
689 #else
690 for (; *s; s++) {
691 width += (ms->flags & MAGIC_RAW) != 0
692 || isprint(CAST(unsigned char, *s)) ? 1 : 4;
693 }
694 #endif
695 return width;
696 }
697
698 file_private void
usage(void)699 usage(void)
700 {
701 const char *pn = file_getprogname();
702 (void)fprintf(stderr, USAGE, pn, pn, pn);
703 exit(EXIT_FAILURE);
704 }
705
706 file_private void
defprint(int def)707 defprint(int def)
708 {
709 if (!def)
710 return;
711 if (((def & 1) && posixly) || ((def & 2) && !posixly))
712 (void)fprintf(stdout, " (default)");
713 (void)putc('\n', stdout);
714 }
715
716 file_private void
docprint(const char * opts,int def)717 docprint(const char *opts, int def)
718 {
719 size_t i;
720 int comma, pad;
721 char *sp, *p;
722
723 p = CCAST(char *, strchr(opts, '%'));
724 if (p == NULL) {
725 (void)fprintf(stdout, "%s", opts);
726 defprint(def);
727 return;
728 }
729
730 for (sp = p - 1; sp > opts && *sp == ' '; sp--)
731 continue;
732
733 (void)printf("%.*s", CAST(int, p - opts), opts);
734 pad = (int)CAST(int, p - sp - 1);
735
736 switch (*++p) {
737 case 'e':
738 comma = 0;
739 for (i = 0; i < __arraycount(nv); i++) {
740 (void)printf("%s%s", comma++ ? ", " : "", nv[i].name);
741 if (i && i % 5 == 0 && i != __arraycount(nv) - 1) {
742 (void)printf(",\n%*s", pad, "");
743 comma = 0;
744 }
745 }
746 break;
747 case 'P':
748 for (i = 0; i < __arraycount(pm); i++) {
749 (void)printf("%9s %7zu %s", pm[i].name, pm[i].def,
750 pm[i].desc);
751 if (i != __arraycount(pm) - 1)
752 (void)printf("\n%*s", pad, "");
753 }
754 break;
755 default:
756 file_errx(EXIT_FAILURE, "Unknown escape `%c' in long options",
757 *p);
758 break;
759 }
760 (void)printf("%s", opts + (p - opts) + 1);
761
762 }
763
764 file_private void
help(void)765 help(void)
766 {
767 (void)fputs(
768 "Usage: file [OPTION...] [FILE...]\n"
769 "Determine type of FILEs.\n"
770 "\n", stdout);
771 #define OPT(shortname, longname, opt, def, doc) \
772 (void)printf(" -%c, --" longname, shortname), \
773 docprint(doc, def);
774 #define OPT_LONGONLY(longname, opt, def, doc, id) \
775 (void)printf(" --" longname), \
776 docprint(doc, def);
777 #include "file_opts.h"
778 #undef OPT
779 #undef OPT_LONGONLY
780 (void)printf("\nReport bugs to https://bugs.astron.com/\n");
781 exit(EXIT_SUCCESS);
782 }
783
784 file_private const char *file_progname;
785
786 file_protected void
file_setprogname(const char * progname)787 file_setprogname(const char *progname)
788 {
789 file_progname = progname;
790 }
791
792 file_protected const char *
file_getprogname(void)793 file_getprogname(void)
794 {
795 return file_progname;
796 }
797
798 file_protected void
file_err(int e,const char * fmt,...)799 file_err(int e, const char *fmt, ...)
800 {
801 va_list ap;
802 int se = errno;
803
804 va_start(ap, fmt);
805 (void)fprintf(stderr, "%s: ", file_progname);
806 (void)vfprintf(stderr, fmt, ap);
807 va_end(ap);
808 if (se)
809 (void)fprintf(stderr, " (%s)\n", strerror(se));
810 else
811 fputc('\n', stderr);
812 exit(e);
813 }
814
815 file_protected void
file_errx(int e,const char * fmt,...)816 file_errx(int e, const char *fmt, ...)
817 {
818 va_list ap;
819
820 va_start(ap, fmt);
821 (void)fprintf(stderr, "%s: ", file_progname);
822 (void)vfprintf(stderr, fmt, ap);
823 va_end(ap);
824 (void)fprintf(stderr, "\n");
825 exit(e);
826 }
827
828 file_protected void
file_warn(const char * fmt,...)829 file_warn(const char *fmt, ...)
830 {
831 va_list ap;
832 int se = errno;
833
834 va_start(ap, fmt);
835 (void)fprintf(stderr, "%s: ", file_progname);
836 (void)vfprintf(stderr, fmt, ap);
837 va_end(ap);
838 if (se)
839 (void)fprintf(stderr, " (%s)\n", strerror(se));
840 else
841 fputc('\n', stderr);
842 errno = se;
843 }
844
845 file_protected void
file_warnx(const char * fmt,...)846 file_warnx(const char *fmt, ...)
847 {
848 va_list ap;
849 int se = errno;
850
851 va_start(ap, fmt);
852 (void)fprintf(stderr, "%s: ", file_progname);
853 (void)vfprintf(stderr, fmt, ap);
854 va_end(ap);
855 (void)fprintf(stderr, "\n");
856 errno = se;
857 }
858