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.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
29 * file - find type of a file or files - main program.
35 FILE_RCSID("@(#)$File: file.c,v 1.131 2009/02/13 18:48:05 christos Exp $")
44 # if (__COHERENT__ >= 0x420)
45 # include <sys/utime.h>
48 # include <sys/time.h>
55 #include <unistd.h> /* for read() */
64 #if defined(HAVE_GETOPT_H) && defined(HAVE_STRUCT_OPTION)
69 #ifndef HAVE_GETOPT_LONG
70 int getopt_long(int argc, char * const *argv, const char *optstring, const struct option *longopts, int *longindex);
73 #include <netinet/in.h> /* for byte swapping */
75 #include "patchlevel.h"
78 #define SYMLINKFLAG "Lh"
80 #define SYMLINKFLAG ""
83 # define USAGE "Usage: %s [-bcik" SYMLINKFLAG "nNrsvz0] [-e test] [-f namefile] [-F separator] [-m magicfiles] file...\n %s -C -m magicfiles\n"
86 #define MAXPATHLEN 1024
89 private int /* Global command-line options */
90 bflag = 0, /* brief output format */
91 nopad = 0, /* Don't pad output */
92 nobuffer = 0, /* Do not buffer stdout */
93 nulsep = 0; /* Append '\0' to the separator */
95 private const char *default_magicfile = MAGIC;
96 private const char *separator = ":"; /* Default field separator */
97 private const char hmagic[] = "/.magic";
98 private const struct option long_options[] = {
99 #define OPT(shortname, longname, opt, doc) \
100 {longname, opt, NULL, shortname},
101 #define OPT_LONGONLY(longname, opt, doc) \
102 {longname, opt, NULL, 0},
103 #include "file_opts.h"
108 #define OPTSTRING "bcCde:f:F:hikLm:nNprsvz0"
110 private const struct {
114 { "apptype", MAGIC_NO_CHECK_APPTYPE },
115 { "ascii", MAGIC_NO_CHECK_ASCII },
116 { "cdf", MAGIC_NO_CHECK_CDF },
117 { "compress", MAGIC_NO_CHECK_COMPRESS },
118 { "elf", MAGIC_NO_CHECK_ELF },
119 { "encoding", MAGIC_NO_CHECK_ENCODING },
120 { "soft", MAGIC_NO_CHECK_SOFT },
121 { "tar", MAGIC_NO_CHECK_TAR },
122 { "tokens", MAGIC_NO_CHECK_TOKENS },
125 private char *progname; /* used throughout */
127 private void usage(void);
128 private void help(void);
129 int main(int, char *[]);
131 private int unwrap(struct magic_set *, const char *);
132 private int process(struct magic_set *ms, const char *, int);
133 private struct magic_set *load(const char *, int);
137 * main - parse arguments and handle options
140 main(int argc, char *argv[])
144 int action = 0, didsomefiles = 0, errflg = 0;
145 int flags = 0, e = 0;
146 char *home, *usermagic;
147 struct magic_set *magic = NULL;
148 char magicpath[2 * MAXPATHLEN + 2];
150 const char *magicfile; /* where the magic is */
152 /* makes islower etc work for other langs */
153 (void)setlocale(LC_CTYPE, "");
156 /* sh-like wildcard expansion! Shouldn't hurt at least ... */
157 _wildcard(&argc, &argv);
160 if ((progname = strrchr(argv[0], '/')) != NULL)
165 magicfile = default_magicfile;
166 if ((usermagic = getenv("MAGIC")) != NULL)
167 magicfile = usermagic;
169 if ((home = getenv("HOME")) != NULL) {
170 (void)snprintf(magicpath, sizeof(magicpath), "%s%s",
172 if (access(magicpath, R_OK) == 0) {
173 (void)snprintf(magicpath, sizeof(magicpath),
174 "%s%s:%s", home, hmagic, magicfile);
175 magicfile = magicpath;
180 flags |= getenv("POSIXLY_CORRECT") ? MAGIC_SYMLINK : 0;
182 while ((c = getopt_long(argc, argv, OPTSTRING, long_options,
191 flags |= MAGIC_APPLE;
194 flags |= MAGIC_MIME_TYPE;
197 flags |= MAGIC_MIME_ENCODING;
211 action = FILE_COMPILE;
214 flags |= MAGIC_DEBUG|MAGIC_CHECK;
217 for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++)
218 if (strcmp(nv[i].name, optarg) == 0)
221 if (i == sizeof(nv) / sizeof(nv[0]))
224 flags |= nv[i].value;
231 if ((magic = load(magicfile, flags)) == NULL)
233 e |= unwrap(magic, optarg);
243 flags |= MAGIC_CONTINUE;
254 #if defined(HAVE_UTIME) || defined(HAVE_UTIMES)
256 flags |= MAGIC_PRESERVE_ATIME;
263 flags |= MAGIC_DEVICES;
266 (void)fprintf(stderr, "%s-%d.%.2d\n", progname,
267 FILE_VERSION_MAJOR, patchlevel);
268 (void)fprintf(stderr, "magic file from %s\n",
272 flags |= MAGIC_COMPRESS;
276 flags |= MAGIC_SYMLINK;
279 flags &= ~MAGIC_SYMLINK;
298 * Don't try to check/compile ~/.magic unless we explicitly
301 if (magicfile == magicpath)
302 magicfile = default_magicfile;
303 magic = magic_open(flags|MAGIC_CHECK);
305 (void)fprintf(stderr, "%s: %s\n", progname,
309 c = action == FILE_CHECK ? magic_check(magic, magicfile) :
310 magic_compile(magic, magicfile);
312 (void)fprintf(stderr, "%s: %s\n", progname,
319 if ((magic = load(magicfile, flags)) == NULL)
324 if (optind == argc) {
330 for (wid = 0, j = (size_t)optind; j < (size_t)argc; j++) {
331 nw = file_mbswidth(argv[j]);
336 * If bflag is only set twice, set it depending on
337 * number of files [this is undocumented, and subject to change]
340 bflag = optind >= argc - 1;
342 for (; optind < argc; optind++)
343 e |= process(magic, argv[optind], wid);
352 private struct magic_set *
354 load(const char *magicfile, int flags)
356 struct magic_set *magic = magic_open(flags);
358 (void)fprintf(stderr, "%s: %s\n", progname, strerror(errno));
361 if (magic_load(magic, magicfile) == -1) {
362 (void)fprintf(stderr, "%s: %s\n",
363 progname, magic_error(magic));
371 * unwrap -- read a file of filenames, do each one.
374 unwrap(struct magic_set *ms, const char *fn)
376 char buf[MAXPATHLEN];
381 if (strcmp("-", fn) == 0) {
385 if ((f = fopen(fn, "r")) == NULL) {
386 (void)fprintf(stderr, "%s: Cannot open `%s' (%s).\n",
387 progname, fn, strerror(errno));
391 while (fgets(buf, sizeof(buf), f) != NULL) {
392 buf[strcspn(buf, "\n")] = '\0';
393 cwid = file_mbswidth(buf);
401 while (fgets(buf, sizeof(buf), f) != NULL) {
402 buf[strcspn(buf, "\n")] = '\0';
403 e |= process(ms, buf, wid);
405 (void)fflush(stdout);
413 * Called for each input file on the command line (or in a list of files)
416 process(struct magic_set *ms, const char *inname, int wid)
419 int std_in = strcmp(inname, "-") == 0;
421 if (wid > 0 && !bflag) {
422 (void)printf("%s", std_in ? "/dev/stdin" : inname);
424 (void)putc('\0', stdout);
426 (void)printf("%s", separator);
428 (int) (nopad ? 0 : (wid - file_mbswidth(inname))), "");
431 type = magic_file(ms, std_in ? NULL : inname);
433 (void)printf("ERROR: %s\n", magic_error(ms));
436 (void)printf("%s\n", type);
442 file_mbswidth(const char *s)
444 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
445 size_t bytesconsumed, old_n, n, width = 0;
448 (void)memset(&state, 0, sizeof(mbstate_t));
449 old_n = n = strlen(s);
452 bytesconsumed = mbrtowc(&nextchar, s, n, &state);
453 if (bytesconsumed == (size_t)(-1) ||
454 bytesconsumed == (size_t)(-2)) {
455 /* Something went wrong, return something reasonable */
460 * do what strlen() would do, so that caller
465 width += wcwidth(nextchar);
467 s += bytesconsumed, n -= bytesconsumed;
478 (void)fprintf(stderr, USAGE, progname, progname);
479 (void)fputs("Try `file --help' for more information.\n", stderr);
487 "Usage: file [OPTION...] [FILE...]\n"
488 "Determine type of FILEs.\n"
490 #define OPT(shortname, longname, opt, doc) \
491 fprintf(stderr, " -%c, --" longname doc, shortname);
492 #define OPT_LONGONLY(longname, opt, doc) \
493 fprintf(stderr, " --" longname doc);
494 #include "file_opts.h"