1 /* $NetBSD: file.c,v 1.18 2023/08/18 19:00:11 christos Exp $ */
2
3 /*
4 * Copyright (c) Ian F. Darwin 1986-1995.
5 * Software written by Ian F. Darwin and others;
6 * maintained 1995-present by Christos Zoulas and others.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice immediately at the beginning of the file, without modification,
13 * this list of conditions, and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
22 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30 /*
31 * file - find type of a file or files - main program.
32 */
33
34 #include "file.h"
35
36 #ifndef lint
37 #if 0
38 FILE_RCSID("@(#)$File: file.c,v 1.215 2023/05/21 17:08:34 christos Exp $")
39 #else
40 __RCSID("$NetBSD: file.c,v 1.18 2023/08/18 19:00:11 christos Exp $");
41 #endif
42 #endif /* lint */
43
44 #include "magic.h"
45
46 #include <stdlib.h>
47 #include <unistd.h>
48 #include <string.h>
49 #ifdef RESTORE_TIME
50 # if (__COHERENT__ >= 0x420)
51 # include <sys/utime.h>
52 # else
53 # ifdef USE_UTIMES
54 # include <sys/time.h>
55 # else
56 # include <utime.h>
57 # endif
58 # endif
59 #endif
60 #ifdef HAVE_UNISTD_H
61 #include <unistd.h> /* for read() */
62 #endif
63 #ifdef HAVE_WCHAR_H
64 #include <wchar.h>
65 #endif
66 #ifdef HAVE_WCTYPE_H
67 #include <wctype.h>
68 #endif
69 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH) && \
70 defined(HAVE_WCTYPE_H)
71 #define FILE_WIDE_SUPPORT
72 #else
73 #include <ctype.h>
74 #endif
75
76 #if defined(HAVE_GETOPT_H) && defined(HAVE_STRUCT_OPTION)
77 # include <getopt.h>
78 # ifndef HAVE_GETOPT_LONG
79 int getopt_long(int, char * const *, const char *,
80 const struct option *, int *);
81 # endif
82 # else
83 # include "mygetopt.h"
84 #endif
85
86 #ifdef S_IFLNK
87 # define IFLNK_h "h"
88 # define IFLNK_L "L"
89 #else
90 # define IFLNK_h ""
91 # define IFLNK_L ""
92 #endif
93
94 #define FILE_FLAGS "bcCdE" IFLNK_h "ik" IFLNK_L "lNnprsSvzZ0"
95 #define OPTSTRING "bcCde:Ef:F:hiklLm:nNpP:rsSvzZ0"
96
97 # define USAGE \
98 "Usage: %s [-" FILE_FLAGS "] [--apple] [--extension] [--mime-encoding]\n" \
99 " [--mime-type] [-e <testname>] [-F <separator>] " \
100 " [-f <namefile>]\n" \
101 " [-m <magicfiles>] [-P <parameter=value>] [--exclude-quiet]\n" \
102 " <file> ...\n" \
103 " %s -C [-m <magicfiles>]\n" \
104 " %s [--help]\n"
105
106 file_private int /* Global command-line options */
107 bflag = 0, /* brief output format */
108 nopad = 0, /* Don't pad output */
109 nobuffer = 0, /* Do not buffer stdout */
110 nulsep = 0; /* Append '\0' to the separator */
111
112 file_private const char *separator = ":"; /* Default field separator */
113 file_private const struct option long_options[] = {
114 #define OPT_HELP 1
115 #define OPT_APPLE 2
116 #define OPT_EXTENSIONS 3
117 #define OPT_MIME_TYPE 4
118 #define OPT_MIME_ENCODING 5
119 #define OPT_EXCLUDE_QUIET 6
120 #define OPT(shortname, longname, opt, def, doc) \
121 {longname, opt, NULL, shortname},
122 #define OPT_LONGONLY(longname, opt, def, doc, id) \
123 {longname, opt, NULL, id},
124 #include "file_opts.h"
125 #undef OPT
126 #undef OPT_LONGONLY
127 {0, 0, NULL, 0}
128 };
129
130 file_private const struct {
131 const char *name;
132 int value;
133 } nv[] = {
134 { "apptype", MAGIC_NO_CHECK_APPTYPE },
135 { "ascii", MAGIC_NO_CHECK_ASCII },
136 { "cdf", MAGIC_NO_CHECK_CDF },
137 { "compress", MAGIC_NO_CHECK_COMPRESS },
138 { "csv", MAGIC_NO_CHECK_CSV },
139 { "elf", MAGIC_NO_CHECK_ELF },
140 { "encoding", MAGIC_NO_CHECK_ENCODING },
141 { "soft", MAGIC_NO_CHECK_SOFT },
142 { "tar", MAGIC_NO_CHECK_TAR },
143 { "json", MAGIC_NO_CHECK_JSON },
144 { "simh", MAGIC_NO_CHECK_SIMH },
145 { "text", MAGIC_NO_CHECK_TEXT }, /* synonym for ascii */
146 { "tokens", MAGIC_NO_CHECK_TOKENS }, /* OBSOLETE: ignored for backwards compatibility */
147 };
148
149 file_private struct {
150 const char *name;
151 size_t value;
152 size_t def;
153 const char *desc;
154 int tag;
155 int set;
156 } pm[] = {
157 { "bytes", 0, FILE_BYTES_MAX, "max bytes to look inside file",
158 MAGIC_PARAM_BYTES_MAX, 0 },
159 { "elf_notes", 0, FILE_ELF_NOTES_MAX, "max ELF notes processed",
160 MAGIC_PARAM_ELF_NOTES_MAX, 0 },
161 { "elf_phnum", 0, FILE_ELF_PHNUM_MAX, "max ELF prog sections processed",
162 MAGIC_PARAM_ELF_PHNUM_MAX, 0 },
163 { "elf_shnum", 0, FILE_ELF_SHNUM_MAX, "max ELF sections processed",
164 MAGIC_PARAM_ELF_SHNUM_MAX, 0 },
165 { "elf_shsize", 0, FILE_ELF_SHSIZE_MAX, "max ELF section size",
166 MAGIC_PARAM_ELF_SHSIZE_MAX, 0 },
167 { "encoding", 0, FILE_ENCODING_MAX, "max bytes to scan for encoding",
168 MAGIC_PARAM_ENCODING_MAX, 0 },
169 { "indir", 0, FILE_INDIR_MAX, "recursion limit for indirection",
170 MAGIC_PARAM_INDIR_MAX, 0 },
171 { "name", 0, FILE_NAME_MAX, "use limit for name/use magic",
172 MAGIC_PARAM_NAME_MAX, 0 },
173 { "regex", 0, FILE_REGEX_MAX, "length limit for REGEX searches",
174 MAGIC_PARAM_REGEX_MAX, 0 },
175 };
176
177 file_private int posixly;
178
179 #ifdef __dead
180 __dead
181 #endif
182 file_private void usage(void);
183 file_private void docprint(const char *, int);
184 #ifdef __dead
185 __dead
186 #endif
187 file_private void help(void);
188
189 file_private int unwrap(struct magic_set *, const char *);
190 file_private int process(struct magic_set *ms, const char *, int);
191 file_private struct magic_set *load(const char *, int);
192 file_private void setparam(const char *);
193 file_private void applyparam(magic_t);
194
195
196 /*
197 * main - parse arguments and handle options
198 */
199 int
main(int argc,char * argv[])200 main(int argc, char *argv[])
201 {
202 int c;
203 size_t i, j, wid, nw;
204 int action = 0, didsomefiles = 0, errflg = 0;
205 int flags = 0, e = 0;
206 #ifdef HAVE_LIBSECCOMP
207 int sandbox = 1;
208 #endif
209 struct magic_set *magic = NULL;
210 int longindex;
211 const char *magicfile = NULL; /* where the magic is */
212 char *progname;
213
214 /* makes islower etc work for other langs */
215 (void)setlocale(LC_CTYPE, "");
216
217 #ifdef __EMX__
218 /* sh-like wildcard expansion! Shouldn't hurt at least ... */
219 _wildcard(&argc, &argv);
220 #endif
221
222 if ((progname = strrchr(argv[0], '/')) != NULL)
223 progname++;
224 else
225 progname = argv[0];
226
227 file_setprogname(progname);
228
229
230 #ifdef S_IFLNK
231 posixly = getenv("POSIXLY_CORRECT") != NULL;
232 flags |= posixly ? MAGIC_SYMLINK : 0;
233 #endif
234 while ((c = getopt_long(argc, argv, OPTSTRING, long_options,
235 &longindex)) != -1)
236 switch (c) {
237 case OPT_HELP:
238 help();
239 break;
240 case OPT_APPLE:
241 flags |= MAGIC_APPLE;
242 break;
243 case OPT_EXTENSIONS:
244 flags |= MAGIC_EXTENSION;
245 break;
246 case OPT_MIME_TYPE:
247 flags |= MAGIC_MIME_TYPE;
248 break;
249 case OPT_MIME_ENCODING:
250 flags |= MAGIC_MIME_ENCODING;
251 break;
252 case '0':
253 nulsep++;
254 break;
255 case 'b':
256 bflag++;
257 break;
258 case 'c':
259 action = FILE_CHECK;
260 break;
261 case 'C':
262 action = FILE_COMPILE;
263 break;
264 case 'd':
265 flags |= MAGIC_DEBUG|MAGIC_CHECK;
266 break;
267 case 'E':
268 flags |= MAGIC_ERROR;
269 break;
270 case 'e':
271 case OPT_EXCLUDE_QUIET:
272 for (i = 0; i < __arraycount(nv); i++)
273 if (strcmp(nv[i].name, optarg) == 0)
274 break;
275
276 if (i == __arraycount(nv)) {
277 if (c != OPT_EXCLUDE_QUIET)
278 errflg++;
279 } else
280 flags |= nv[i].value;
281 break;
282
283 case 'f':
284 if(action)
285 usage();
286 if (magic == NULL)
287 if ((magic = load(magicfile, flags)) == NULL)
288 return 1;
289 applyparam(magic);
290 e |= unwrap(magic, optarg);
291 ++didsomefiles;
292 break;
293 case 'F':
294 separator = optarg;
295 break;
296 case 'i':
297 flags |= MAGIC_MIME;
298 break;
299 case 'k':
300 flags |= MAGIC_CONTINUE;
301 break;
302 case 'l':
303 action = FILE_LIST;
304 break;
305 case 'm':
306 magicfile = optarg;
307 break;
308 case 'n':
309 ++nobuffer;
310 break;
311 case 'N':
312 ++nopad;
313 break;
314 #if defined(HAVE_UTIME) || defined(HAVE_UTIMES)
315 case 'p':
316 flags |= MAGIC_PRESERVE_ATIME;
317 break;
318 #endif
319 case 'P':
320 setparam(optarg);
321 break;
322 case 'r':
323 flags |= MAGIC_RAW;
324 break;
325 case 's':
326 flags |= MAGIC_DEVICES;
327 break;
328 case 'S':
329 #ifdef HAVE_LIBSECCOMP
330 sandbox = 0;
331 #endif
332 break;
333 case 'v':
334 if (magicfile == NULL)
335 magicfile = magic_getpath(magicfile, action);
336 (void)fprintf(stdout, "%s-%s\n", file_getprogname(),
337 VERSION);
338 (void)fprintf(stdout, "magic file from %s\n",
339 magicfile);
340 #ifdef HAVE_LIBSECCOMP
341 (void)fprintf(stdout, "seccomp support included\n");
342 #endif
343 return 0;
344 case 'z':
345 flags |= MAGIC_COMPRESS;
346 break;
347
348 case 'Z':
349 flags |= MAGIC_COMPRESS|MAGIC_COMPRESS_TRANSP;
350 break;
351 #ifdef S_IFLNK
352 case 'L':
353 flags |= MAGIC_SYMLINK;
354 break;
355 case 'h':
356 flags &= ~MAGIC_SYMLINK;
357 break;
358 #endif
359 case '?':
360 default:
361 errflg++;
362 break;
363 }
364
365 if (errflg) {
366 usage();
367 }
368 if (e)
369 return e;
370
371 #ifdef HAVE_LIBSECCOMP
372 #if 0
373 if (sandbox && enable_sandbox_basic() == -1)
374 #else
375 if (sandbox && enable_sandbox_full() == -1)
376 #endif
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 char *s;
478
479 if ((s = CCAST(char *, strchr(p, '='))) == NULL)
480 goto badparm;
481
482 for (i = 0; i < __arraycount(pm); i++) {
483 if (strncmp(p, pm[i].name, s - p) != 0)
484 continue;
485 pm[i].value = atoi(s + 1);
486 pm[i].set = 1;
487 return;
488 }
489 badparm:
490 file_errx(EXIT_FAILURE, "Unknown param %s", p);
491 }
492
493 file_private struct magic_set *
494 /*ARGSUSED*/
load(const char * magicfile,int flags)495 load(const char *magicfile, int flags)
496 {
497 struct magic_set *magic = magic_open(flags);
498 const char *e;
499
500 if (magic == NULL) {
501 file_warn("Can't create magic");
502 return NULL;
503 }
504 if (magic_load(magic, magicfile) == -1) {
505 file_warn("%s", magic_error(magic));
506 magic_close(magic);
507 return NULL;
508 }
509 if ((e = magic_error(magic)) != NULL)
510 file_warn("%s", e);
511 return magic;
512 }
513
514 /*
515 * unwrap -- read a file of filenames, do each one.
516 */
517 file_private int
unwrap(struct magic_set * ms,const char * fn)518 unwrap(struct magic_set *ms, const char *fn)
519 {
520 FILE *f;
521 ssize_t len;
522 char *line = NULL;
523 size_t llen = 0;
524 int wid = 0, cwid;
525 int e = 0;
526 size_t fi = 0, fimax = 0;
527 char **flist = NULL;
528
529 if (strcmp("-", fn) == 0)
530 f = stdin;
531 else {
532 if ((f = fopen(fn, "r")) == NULL) {
533 file_warn("Cannot open `%s'", fn);
534 return 1;
535 }
536 }
537
538 while ((len = getline(&line, &llen, f)) > 0) {
539 if (line[len - 1] == '\n')
540 line[len - 1] = '\0';
541 cwid = file_mbswidth(ms, line);
542 if (nobuffer) {
543 e |= process(ms, line, cwid);
544 free(line);
545 line = NULL;
546 llen = 0;
547 continue;
548 }
549 if (cwid > wid)
550 wid = cwid;
551 if (fi >= fimax) {
552 fimax += 100;
553 char **nf = CAST(char **,
554 realloc(flist, fimax * sizeof(*flist)));
555 if (nf == NULL) {
556 file_err(EXIT_FAILURE,
557 "Cannot allocate memory for file list");
558 }
559 flist = nf;
560 }
561 flist[fi++] = line;
562 line = NULL;
563 llen = 0;
564 }
565
566 if (!nobuffer) {
567 fimax = fi;
568 for (fi = 0; fi < fimax; fi++) {
569 e |= process(ms, flist[fi], wid);
570 free(flist[fi]);
571 }
572 }
573 free(flist);
574
575 if (f != stdin)
576 (void)fclose(f);
577 return e;
578 }
579
580 file_private void
file_octal(unsigned char c)581 file_octal(unsigned char c)
582 {
583 (void)putc('\\', stdout);
584 (void)putc(((c >> 6) & 7) + '0', stdout);
585 (void)putc(((c >> 3) & 7) + '0', stdout);
586 (void)putc(((c >> 0) & 7) + '0', stdout);
587 }
588
589 file_private void
fname_print(const char * inname)590 fname_print(const char *inname)
591 {
592 size_t n = strlen(inname);
593 #ifdef FILE_WIDE_SUPPORT
594 mbstate_t state;
595 wchar_t nextchar;
596 size_t bytesconsumed;
597
598
599 (void)memset(&state, 0, sizeof(state));
600 while (n > 0) {
601 bytesconsumed = mbrtowc(&nextchar, inname, n, &state);
602 if (bytesconsumed == CAST(size_t, -1) ||
603 bytesconsumed == CAST(size_t, -2)) {
604 nextchar = *inname++;
605 n--;
606 (void)memset(&state, 0, sizeof(state));
607 file_octal(CAST(unsigned char, nextchar));
608 continue;
609 }
610 inname += bytesconsumed;
611 n -= bytesconsumed;
612 if (iswprint(nextchar)) {
613 printf("%lc", (wint_t)nextchar);
614 continue;
615 }
616 /* XXX: What if it is > 255? */
617 file_octal(CAST(unsigned char, nextchar));
618 }
619 #else
620 size_t i;
621 for (i = 0; i < n; i++) {
622 unsigned char c = CAST(unsigned char, inname[i]);
623 if (isprint(c)) {
624 (void)putc(c, stdout);
625 continue;
626 }
627 file_octal(c);
628 }
629 #endif
630 }
631
632 /*
633 * Called for each input file on the command line (or in a list of files)
634 */
635 file_private int
process(struct magic_set * ms,const char * inname,int wid)636 process(struct magic_set *ms, const char *inname, int wid)
637 {
638 const char *type, c = nulsep > 1 ? '\0' : '\n';
639 int std_in = strcmp(inname, "-") == 0;
640 int haderror = 0;
641
642 if (wid > 0 && !bflag) {
643 const char *pname = std_in ? "/dev/stdin" : inname;
644 if ((ms->flags & MAGIC_RAW) == 0)
645 fname_print(pname);
646 else
647 (void)printf("%s", pname);
648 if (nulsep)
649 (void)putc('\0', stdout);
650 if (nulsep < 2) {
651 (void)printf("%s", separator);
652 (void)printf("%*s ", CAST(int, nopad ? 0
653 : (wid - file_mbswidth(ms, inname))), "");
654 }
655 }
656
657 type = magic_file(ms, std_in ? NULL : inname);
658
659 if (type == NULL) {
660 haderror |= printf("ERROR: %s%c", magic_error(ms), c);
661 } else {
662 haderror |= printf("%s%c", type, c) < 0;
663 }
664 if (nobuffer)
665 haderror |= fflush(stdout) != 0;
666 return haderror || type == NULL;
667 }
668
669 file_protected size_t
file_mbswidth(struct magic_set * ms,const char * s)670 file_mbswidth(struct magic_set *ms, const char *s)
671 {
672 size_t width = 0;
673 #ifdef FILE_WIDE_SUPPORT
674 size_t bytesconsumed, n;
675 mbstate_t state;
676 wchar_t nextchar;
677
678 (void)memset(&state, 0, sizeof(state));
679 n = strlen(s);
680
681 while (n > 0) {
682 bytesconsumed = mbrtowc(&nextchar, s, n, &state);
683 if (bytesconsumed == CAST(size_t, -1) ||
684 bytesconsumed == CAST(size_t, -2)) {
685 nextchar = *s;
686 bytesconsumed = 1;
687 (void)memset(&state, 0, sizeof(state));
688 width += 4;
689 } else {
690 int w = wcwidth(nextchar);
691 width += ((ms->flags & MAGIC_RAW) != 0
692 || iswprint(nextchar)) ? (w > 0 ? w : 1) : 4;
693 }
694
695 s += bytesconsumed, n -= bytesconsumed;
696 }
697 #else
698 for (; *s; s++) {
699 width += (ms->flags & MAGIC_RAW) != 0
700 || isprint(CAST(unsigned char, *s)) ? 1 : 4;
701 }
702 #endif
703 return width;
704 }
705
706 file_private void
usage(void)707 usage(void)
708 {
709 const char *pn = file_getprogname();
710 (void)fprintf(stderr, USAGE, pn, pn, pn);
711 exit(EXIT_FAILURE);
712 }
713
714 file_private void
defprint(int def)715 defprint(int def)
716 {
717 if (!def)
718 return;
719 if (((def & 1) && posixly) || ((def & 2) && !posixly))
720 (void)fprintf(stdout, " (default)");
721 (void)putc('\n', stdout);
722 }
723
724 file_private void
docprint(const char * opts,int def)725 docprint(const char *opts, int def)
726 {
727 size_t i;
728 int comma, pad;
729 char *sp, *p;
730
731 p = CCAST(char *, strchr(opts, '%'));
732 if (p == NULL) {
733 (void)fprintf(stdout, "%s", opts);
734 defprint(def);
735 return;
736 }
737
738 for (sp = p - 1; sp > opts && *sp == ' '; sp--)
739 continue;
740
741 (void)printf("%.*s", CAST(int, p - opts), opts);
742 pad = (int)CAST(int, p - sp - 1);
743
744 switch (*++p) {
745 case 'e':
746 comma = 0;
747 for (i = 0; i < __arraycount(nv); i++) {
748 (void)printf("%s%s", comma++ ? ", " : "", nv[i].name);
749 if (i && i % 5 == 0 && i != __arraycount(nv) - 1) {
750 (void)printf(",\n%*s", pad, "");
751 comma = 0;
752 }
753 }
754 break;
755 case 'P':
756 for (i = 0; i < __arraycount(pm); i++) {
757 (void)printf("%9s %7zu %s", pm[i].name, pm[i].def,
758 pm[i].desc);
759 if (i != __arraycount(pm) - 1)
760 (void)printf("\n%*s", pad, "");
761 }
762 break;
763 default:
764 file_errx(EXIT_FAILURE, "Unknown escape `%c' in long options",
765 *p);
766 break;
767 }
768 (void)printf("%s", opts + (p - opts) + 1);
769
770 }
771
772 file_private void
help(void)773 help(void)
774 {
775 (void)fputs(
776 "Usage: file [OPTION...] [FILE...]\n"
777 "Determine type of FILEs.\n"
778 "\n", stdout);
779 #define OPT(shortname, longname, opt, def, doc) \
780 (void)printf(" -%c, --" longname, shortname), \
781 docprint(doc, def);
782 #define OPT_LONGONLY(longname, opt, def, doc, id) \
783 (void)printf(" --" longname), \
784 docprint(doc, def);
785 #include "file_opts.h"
786 #undef OPT
787 #undef OPT_LONGONLY
788 (void)printf("\nReport bugs to https://bugs.astron.com/\n");
789 exit(EXIT_SUCCESS);
790 }
791
792 file_private const char *file_progname;
793
794 file_protected void
file_setprogname(const char * progname)795 file_setprogname(const char *progname)
796 {
797 file_progname = progname;
798 }
799
800 file_protected const char *
file_getprogname(void)801 file_getprogname(void)
802 {
803 return file_progname;
804 }
805
806 file_protected void
file_err(int e,const char * fmt,...)807 file_err(int e, const char *fmt, ...)
808 {
809 va_list ap;
810 int se = errno;
811
812 va_start(ap, fmt);
813 (void)fprintf(stderr, "%s: ", file_progname);
814 (void)vfprintf(stderr, fmt, ap);
815 va_end(ap);
816 if (se)
817 (void)fprintf(stderr, " (%s)\n", strerror(se));
818 else
819 fputc('\n', stderr);
820 exit(e);
821 }
822
823 file_protected void
file_errx(int e,const char * fmt,...)824 file_errx(int e, const char *fmt, ...)
825 {
826 va_list ap;
827
828 va_start(ap, fmt);
829 (void)fprintf(stderr, "%s: ", file_progname);
830 (void)vfprintf(stderr, fmt, ap);
831 va_end(ap);
832 (void)fprintf(stderr, "\n");
833 exit(e);
834 }
835
836 file_protected void
file_warn(const char * fmt,...)837 file_warn(const char *fmt, ...)
838 {
839 va_list ap;
840 int se = errno;
841
842 va_start(ap, fmt);
843 (void)fprintf(stderr, "%s: ", file_progname);
844 (void)vfprintf(stderr, fmt, ap);
845 va_end(ap);
846 if (se)
847 (void)fprintf(stderr, " (%s)\n", strerror(se));
848 else
849 fputc('\n', stderr);
850 errno = se;
851 }
852
853 file_protected void
file_warnx(const char * fmt,...)854 file_warnx(const char *fmt, ...)
855 {
856 va_list ap;
857 int se = errno;
858
859 va_start(ap, fmt);
860 (void)fprintf(stderr, "%s: ", file_progname);
861 (void)vfprintf(stderr, fmt, ap);
862 va_end(ap);
863 (void)fprintf(stderr, "\n");
864 errno = se;
865 }
866