486 lines
11 KiB
C
486 lines
11 KiB
C
/*
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* Copyright (c) Ian F. Darwin 1986-1995.
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* Software written by Ian F. Darwin and others;
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* maintained 1995-present by Christos Zoulas and others.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* file - find type of a file or files - main program.
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*/
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#include "file.h"
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#include "magic.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/param.h> /* for MAXPATHLEN */
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#include <sys/stat.h>
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#ifdef RESTORE_TIME
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# if (__COHERENT__ >= 0x420)
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# include <sys/utime.h>
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# else
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# ifdef USE_UTIMES
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# include <sys/time.h>
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# else
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# include <utime.h>
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# endif
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# endif
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h> /* for read() */
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#endif
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#ifdef HAVE_LOCALE_H
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#include <locale.h>
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#endif
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#ifdef HAVE_WCHAR_H
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#include <wchar.h>
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#endif
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#ifdef HAVE_GETOPT_H
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#include <getopt.h>
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#else
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#include "mygetopt.h"
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#endif
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#ifndef HAVE_GETOPT_LONG
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int getopt_long(int argc, char * const *argv, const char *optstring, const struct option *longopts, int *longindex);
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#endif
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#include <netinet/in.h> /* for byte swapping */
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#include "patchlevel.h"
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#ifndef lint
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FILE_RCSID("@(#)$File: file.c,v 1.121 2008/07/03 15:48:18 christos Exp $")
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#endif /* lint */
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#ifdef S_IFLNK
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#define SYMLINKFLAG "Lh"
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#else
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#define SYMLINKFLAG ""
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#endif
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# define USAGE "Usage: %s [-bcik" SYMLINKFLAG "nNrsvz0] [-e test] [-f namefile] [-F separator] [-m magicfiles] file...\n %s -C -m magicfiles\n"
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#ifndef MAXPATHLEN
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#define MAXPATHLEN 512
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#endif
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private int /* Global command-line options */
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bflag = 0, /* brief output format */
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nopad = 0, /* Don't pad output */
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nobuffer = 0, /* Do not buffer stdout */
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nulsep = 0; /* Append '\0' to the separator */
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private const char *magicfile = 0; /* where the magic is */
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private const char *default_magicfile = MAGIC;
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private const char *separator = ":"; /* Default field separator */
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private char *progname; /* used throughout */
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private struct magic_set *magic;
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private void unwrap(char *);
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private void usage(void);
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private void help(void);
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int main(int, char *[]);
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private void process(const char *, int);
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private void load(const char *, int);
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/*
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* main - parse arguments and handle options
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*/
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int
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main(int argc, char *argv[])
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{
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int c;
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size_t i;
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int action = 0, didsomefiles = 0, errflg = 0;
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int flags = 0;
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char *home, *usermagic;
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struct stat sb;
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static const char hmagic[] = "/.magic";
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#define OPTSTRING "bcCde:f:F:hikLm:nNprsvz0"
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int longindex;
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static const struct option long_options[] =
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{
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#define OPT(shortname, longname, opt, doc) \
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{longname, opt, NULL, shortname},
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#define OPT_LONGONLY(longname, opt, doc) \
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{longname, opt, NULL, 0},
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#include "file_opts.h"
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#undef OPT
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#undef OPT_LONGONLY
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{0, 0, NULL, 0}
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};
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static const struct {
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const char *name;
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int value;
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} nv[] = {
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{ "apptype", MAGIC_NO_CHECK_APPTYPE },
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{ "ascii", MAGIC_NO_CHECK_ASCII },
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{ "compress", MAGIC_NO_CHECK_COMPRESS },
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{ "elf", MAGIC_NO_CHECK_ELF },
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{ "soft", MAGIC_NO_CHECK_SOFT },
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{ "tar", MAGIC_NO_CHECK_TAR },
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{ "tokens", MAGIC_NO_CHECK_TOKENS },
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};
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/* makes islower etc work for other langs */
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(void)setlocale(LC_CTYPE, "");
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#ifdef __EMX__
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/* sh-like wildcard expansion! Shouldn't hurt at least ... */
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_wildcard(&argc, &argv);
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#endif
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if ((progname = strrchr(argv[0], '/')) != NULL)
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progname++;
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else
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progname = argv[0];
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magicfile = default_magicfile;
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if ((usermagic = getenv("MAGIC")) != NULL)
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magicfile = usermagic;
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else
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if ((home = getenv("HOME")) != NULL) {
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if ((usermagic = malloc(strlen(home)
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+ sizeof(hmagic))) != NULL) {
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(void)strcpy(usermagic, home);
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(void)strcat(usermagic, hmagic);
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if (stat(usermagic, &sb)<0)
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free(usermagic);
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else
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magicfile = usermagic;
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}
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}
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#ifdef S_IFLNK
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flags |= getenv("POSIXLY_CORRECT") ? MAGIC_SYMLINK : 0;
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#endif
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while ((c = getopt_long(argc, argv, OPTSTRING, long_options,
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&longindex)) != -1)
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switch (c) {
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case 0 :
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switch (longindex) {
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case 0:
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help();
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break;
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case 10:
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flags |= MAGIC_MIME_TYPE;
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break;
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case 11:
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flags |= MAGIC_MIME_ENCODING;
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break;
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}
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break;
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case '0':
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nulsep = 1;
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break;
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case 'b':
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bflag++;
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break;
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case 'c':
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action = FILE_CHECK;
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break;
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case 'C':
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action = FILE_COMPILE;
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break;
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case 'd':
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flags |= MAGIC_DEBUG|MAGIC_CHECK;
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break;
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case 'e':
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for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++)
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if (strcmp(nv[i].name, optarg) == 0)
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break;
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if (i == sizeof(nv) / sizeof(nv[0]))
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errflg++;
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else
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flags |= nv[i].value;
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break;
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case 'f':
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if(action)
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usage();
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load(magicfile, flags);
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unwrap(optarg);
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++didsomefiles;
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break;
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case 'F':
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separator = optarg;
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break;
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case 'i':
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flags |= MAGIC_MIME;
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break;
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case 'k':
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flags |= MAGIC_CONTINUE;
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break;
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case 'm':
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magicfile = optarg;
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break;
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case 'n':
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++nobuffer;
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break;
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case 'N':
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++nopad;
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break;
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#if defined(HAVE_UTIME) || defined(HAVE_UTIMES)
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case 'p':
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flags |= MAGIC_PRESERVE_ATIME;
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break;
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#endif
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case 'r':
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flags |= MAGIC_RAW;
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break;
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case 's':
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flags |= MAGIC_DEVICES;
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break;
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case 'v':
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(void)fprintf(stderr, "%s-%d.%.2d\n", progname,
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FILE_VERSION_MAJOR, patchlevel);
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(void)fprintf(stderr, "magic file from %s\n",
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magicfile);
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return 1;
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case 'z':
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flags |= MAGIC_COMPRESS;
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break;
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#ifdef S_IFLNK
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case 'L':
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flags |= MAGIC_SYMLINK;
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break;
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case 'h':
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flags &= ~MAGIC_SYMLINK;
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break;
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#endif
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case '?':
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default:
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errflg++;
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break;
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}
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if (errflg) {
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usage();
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}
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switch(action) {
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case FILE_CHECK:
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case FILE_COMPILE:
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magic = magic_open(flags|MAGIC_CHECK);
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if (magic == NULL) {
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(void)fprintf(stderr, "%s: %s\n", progname,
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strerror(errno));
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return 1;
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}
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c = action == FILE_CHECK ? magic_check(magic, magicfile) :
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magic_compile(magic, magicfile);
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if (c == -1) {
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(void)fprintf(stderr, "%s: %s\n", progname,
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magic_error(magic));
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return -1;
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}
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return 0;
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default:
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load(magicfile, flags);
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break;
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}
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if (optind == argc) {
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if (!didsomefiles) {
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usage();
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}
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}
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else {
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size_t j, wid, nw;
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for (wid = 0, j = (size_t)optind; j < (size_t)argc; j++) {
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nw = file_mbswidth(argv[j]);
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if (nw > wid)
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wid = nw;
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}
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/*
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* If bflag is only set twice, set it depending on
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* number of files [this is undocumented, and subject to change]
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*/
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if (bflag == 2) {
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bflag = optind >= argc - 1;
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}
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for (; optind < argc; optind++)
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process(argv[optind], wid);
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}
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c = magic->haderr ? 1 : 0;
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magic_close(magic);
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return c;
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}
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private void
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/*ARGSUSED*/
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load(const char *m, int flags)
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{
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if (magic || m == NULL)
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return;
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magic = magic_open(flags);
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if (magic == NULL) {
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(void)fprintf(stderr, "%s: %s\n", progname, strerror(errno));
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exit(1);
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}
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if (magic_load(magic, magicfile) == -1) {
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(void)fprintf(stderr, "%s: %s\n",
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progname, magic_error(magic));
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exit(1);
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}
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}
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/*
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* unwrap -- read a file of filenames, do each one.
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*/
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private void
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unwrap(char *fn)
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{
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char buf[MAXPATHLEN];
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FILE *f;
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int wid = 0, cwid;
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if (strcmp("-", fn) == 0) {
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f = stdin;
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wid = 1;
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} else {
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if ((f = fopen(fn, "r")) == NULL) {
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(void)fprintf(stderr, "%s: Cannot open `%s' (%s).\n",
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progname, fn, strerror(errno));
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exit(1);
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}
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while (fgets(buf, sizeof(buf), f) != NULL) {
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buf[strcspn(buf, "\n")] = '\0';
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cwid = file_mbswidth(buf);
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if (cwid > wid)
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wid = cwid;
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}
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rewind(f);
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}
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while (fgets(buf, sizeof(buf), f) != NULL) {
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buf[strcspn(buf, "\n")] = '\0';
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process(buf, wid);
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if(nobuffer)
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(void)fflush(stdout);
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}
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(void)fclose(f);
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}
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/*
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* Called for each input file on the command line (or in a list of files)
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*/
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private void
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process(const char *inname, int wid)
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{
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const char *type;
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int std_in = strcmp(inname, "-") == 0;
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if (wid > 0 && !bflag) {
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(void)printf("%s", std_in ? "/dev/stdin" : inname);
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if (nulsep)
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(void)putc('\0', stdout);
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else
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(void)printf("%s", separator);
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(void)printf("%*s ",
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(int) (nopad ? 0 : (wid - file_mbswidth(inname))), "");
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}
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type = magic_file(magic, std_in ? NULL : inname);
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if (type == NULL)
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(void)printf("ERROR: %s\n", magic_error(magic));
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else
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(void)printf("%s\n", type);
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}
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size_t
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file_mbswidth(const char *s)
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{
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#if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
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size_t bytesconsumed, old_n, n, width = 0;
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mbstate_t state;
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wchar_t nextchar;
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(void)memset(&state, 0, sizeof(mbstate_t));
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old_n = n = strlen(s);
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while (n > 0) {
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bytesconsumed = mbrtowc(&nextchar, s, n, &state);
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if (bytesconsumed == (size_t)(-1) ||
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bytesconsumed == (size_t)(-2)) {
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/* Something went wrong, return something reasonable */
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return old_n;
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}
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if (s[0] == '\n') {
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/*
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* do what strlen() would do, so that caller
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* is always right
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*/
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width++;
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} else
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width += wcwidth(nextchar);
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s += bytesconsumed, n -= bytesconsumed;
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}
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return width;
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#else
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return strlen(s);
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#endif
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}
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private void
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usage(void)
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{
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(void)fprintf(stderr, USAGE, progname, progname);
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(void)fputs("Try `file --help' for more information.\n", stderr);
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exit(1);
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}
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private void
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help(void)
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{
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(void)fputs(
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"Usage: file [OPTION...] [FILE...]\n"
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"Determine type of FILEs.\n"
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"\n", stderr);
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#define OPT(shortname, longname, opt, doc) \
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fprintf(stderr, " -%c, --" longname doc, shortname);
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#define OPT_LONGONLY(longname, opt, doc) \
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fprintf(stderr, " --" longname doc);
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#include "file_opts.h"
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#undef OPT
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#undef OPT_LONGONLY
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exit(0);
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}
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