353 lines
8.5 KiB
C
353 lines
8.5 KiB
C
/*
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* file - find type of a file or files - main program.
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*
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* Copyright (c) Ian F. Darwin, 1987.
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* Written by Ian F. Darwin.
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*
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* This software is not subject to any license of the American Telephone
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* and Telegraph Company or of the Regents of the University of California.
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*
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* Permission is granted to anyone to use this software for any purpose on
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* any computer system, and to alter it and redistribute it freely, subject
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* to the following restrictions:
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*
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* 1. The author is not responsible for the consequences of use of this
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* software, no matter how awful, even if they arise from flaws in it.
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*
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* 2. The origin of this software must not be misrepresented, either by
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* explicit claim or by omission. Since few users ever read sources,
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* credits must appear in the documentation.
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*
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* 3. Altered versions must be plainly marked as such, and must not be
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* misrepresented as being the original software. Since few users
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* ever read sources, credits must appear in the documentation.
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*
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* 4. This notice may not be removed or altered.
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*/
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#include "system.h"
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#include "file.h"
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#include "patchlevel.h"
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#include "debug.h"
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FILE_RCSID("@(#)Id: file.c,v 1.66 2002/07/03 19:00:41 christos Exp ")
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/*@access fmagic @*/
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#ifdef S_IFLNK
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# define USAGE "Usage: %s [-bciknsvzL] [-f namefile] [-m magicfiles] file...\n"
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#else
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# define USAGE "Usage: %s [-bciknsvz] [-f namefile] [-m magicfiles] file...\n"
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#endif
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#ifdef __EMX__
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static char *apptypeName = NULL;
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int os2_apptype (const char *fn, char *buf, int nb);
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#endif /* __EMX__ */
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#ifndef MAXPATHLEN
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#define MAXPATHLEN 512
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#endif
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/* Global command-line options */
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/*@unchecked@*/
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static int nobuffer = 0; /* Do not buffer stdout */
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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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/*@-bounds@*/
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static void
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unwrap(fmagic fm, char *fn)
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/*@globals fileSystem, internalState @*/
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/*@modifies fm, fileSystem, internalState @*/
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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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int xx;
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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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error(EXIT_FAILURE, 0, "Cannot open `%s' (%s).\n", fn, strerror(errno));
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/*@notreached@*/
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}
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while (fgets(buf, sizeof(buf), f) != NULL) {
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cwid = strlen(buf) - 1;
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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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/*@-nullpass@*/ /* LCL: buf is null??? */
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while (fgets(buf, sizeof(buf), f) != NULL)
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/*@=nullpass@*/
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{
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buf[strlen(buf)-1] = '\0';
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fm->obp = fm->obuf;
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*fm->obp = '\0';
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fm->nob = sizeof(fm->obuf);
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xx = fmagicProcess(fm, buf, wid);
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fprintf(stdout, "%s\n", fm->obuf);
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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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/*@=bounds@*/
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/*@exits@*/
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static void
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usage(void)
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/*@globals fileSystem @*/
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/*@modifies fileSystem @*/
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{
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(void)fprintf(stderr, USAGE, __progname);
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(void)fprintf(stderr, "Usage: %s -C [-m magic]\n", __progname);
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#ifdef HAVE_GETOPT_H
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(void)fputs("Try `file --help' for more information.\n", stderr);
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#endif
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exit(EXIT_FAILURE);
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}
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#ifdef HAVE_GETOPT_H
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/*@exits@*/
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static void
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help(void)
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/*@globals fileSystem @*/
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/*@modifies fileSystem @*/
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{
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(void) puts(
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"Usage: file [OPTION]... [FILE]...\n"
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"Determine file type of FILEs.\n"
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"\n"
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" -m, --magic-file LIST use LIST as a colon-separated list of magic\n"
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" number files\n"
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" -z, --uncompress try to look inside compressed files\n"
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" -b, --brief do not prepend filenames to output lines\n"
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" -c, --checking-printout print the parsed form of the magic file, use in\n"
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" conjunction with -m to debug a new magic file\n"
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" before installing it\n"
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" -f, --files-from FILE read the filenames to be examined from FILE\n"
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" -i, --mime output mime type strings\n"
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" -k, --keep-going don't stop at the first match\n"
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" -L, --dereference causes symlinks to be followed\n"
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" -n, --no-buffer do not buffer output\n"
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" -s, --special-files treat special (block/char devices) files as\n"
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" ordinary ones\n"
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" --help display this help and exit\n"
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" --version output version information and exit\n"
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);
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exit(0);
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}
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#endif
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/*
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* main - parse arguments and handle options
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*/
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/*@-bounds@*/
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int
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main(int argc, char **argv)
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/*@globals global_fmagic, nobuffer,
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default_magicfile, optind,
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fileSystem, internalState @*/
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/*@modifies global_fmagic, nobuffer,
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default_magicfile, optind,
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fileSystem, internalState @*/
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{
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int xx;
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int c;
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int action = 0, didsomefiles = 0, errflg = 0, ret = 0, app = 0;
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char *mime, *home, *usermagic;
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fmagic fm = global_fmagic;
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struct stat sb;
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#define OPTSTRING "bcdf:ikm:nsvzCL"
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#ifdef HAVE_GETOPT_H
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int longindex = 0;
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/*@-nullassign -readonlytrans@*/
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static struct option long_options[] =
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{
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{"version", 0, 0, 'v'},
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{"help", 0, 0, 0},
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{"brief", 0, 0, 'b'},
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{"checking-printout", 0, 0, 'c'},
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{"debug", 0, 0, 'd'},
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{"files-from", 1, 0, 'f'},
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{"mime", 0, 0, 'i'},
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{"keep-going", 0, 0, 'k'},
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#ifdef S_IFLNK
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{"dereference", 0, 0, 'L'},
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#endif
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{"magic-file", 1, 0, 'm'},
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{"uncompress", 0, 0, 'z'},
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{"no-buffer", 0, 0, 'n'},
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{"special-files", 0, 0, 's'},
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{"compile", 0, 0, 'C'},
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{0, 0, 0, 0},
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};
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/*@=nullassign =readonlytrans@*/
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#endif
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#if HAVE_MCHECK_H && HAVE_MTRACE
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/*@-noeffect@*/
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mtrace(); /* Trace malloc only if MALLOC_TRACE=mtrace-output-file. */
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/*@=noeffect@*/
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#endif
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#ifdef LC_CTYPE
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setlocale(LC_CTYPE, ""); /* makes islower etc work for other langs */
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#endif
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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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/*@-assignexpose@*/
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fm->magicfile = default_magicfile;
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/*@=assignexpose@*/
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if ((usermagic = getenv("MAGIC")) != NULL)
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fm->magicfile = usermagic;
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else {
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if ((home = getenv("HOME")) != NULL) {
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size_t nb = strlen(home) + 8;
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usermagic = xmalloc(nb);
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(void)strcpy(usermagic, home);
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(void)strcat(usermagic, "/.magic");
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if (stat(usermagic, &sb)<0)
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free(usermagic);
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else
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fm->magicfile = usermagic;
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}
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}
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#ifndef HAVE_GETOPT_H
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while ((c = getopt(argc, argv, OPTSTRING)) != -1)
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#else
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while ((c = getopt_long(argc, argv, OPTSTRING, long_options,
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&longindex)) != -1)
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#endif
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{
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switch (c) {
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#ifdef HAVE_GETOPT_H
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case 0 :
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if (longindex == 1)
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help();
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/*@switchbreak@*/ break;
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#endif
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case 'b':
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fm->flags |= FMAGIC_FLAGS_BRIEF;
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/*@switchbreak@*/ break;
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case 'c':
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action = CHECK;
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/*@switchbreak@*/ break;
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case 'C':
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action = COMPILE;
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/*@switchbreak@*/ break;
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case 'd':
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fm->flags |= FMAGIC_FLAGS_DEBUG;
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/*@switchbreak@*/ break;
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case 'f':
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if (!app) {
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ret = fmagicSetup(fm, fm->magicfile, action);
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if (action)
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exit(ret);
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app = 1;
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}
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unwrap(fm, optarg);
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++didsomefiles;
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/*@switchbreak@*/ break;
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case 'i':
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fm->flags |= FMAGIC_FLAGS_MIME;
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mime = malloc(strlen(fm->magicfile) + sizeof(".mime"));
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if (mime != NULL) {
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(void)strcpy(mime, fm->magicfile);
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(void)strcat(mime, ".mime");
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}
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fm->magicfile = mime;
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/*@switchbreak@*/ break;
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case 'k':
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fm->flags |= FMAGIC_FLAGS_CONTINUE;
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/*@switchbreak@*/ break;
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case 'm':
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/*@-assignexpose@*/
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fm->magicfile = optarg;
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/*@=assignexpose@*/
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/*@switchbreak@*/ break;
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case 'n':
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++nobuffer;
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/*@switchbreak@*/ break;
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case 's':
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fm->flags |= FMAGIC_FLAGS_SPECIAL;
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/*@switchbreak@*/ break;
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case 'v':
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(void) fprintf(stdout, "%s-%d.%d\n", __progname,
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FILE_VERSION_MAJOR, patchlevel);
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(void) fprintf(stdout, "magic file from %s\n",
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fm->magicfile);
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return 1;
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case 'z':
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fm->flags |= FMAGIC_FLAGS_UNCOMPRESS;
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/*@switchbreak@*/ break;
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#ifdef S_IFLNK
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case 'L':
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fm->flags |= FMAGIC_FLAGS_FOLLOW;
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/*@switchbreak@*/ 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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/*@switchbreak@*/ break;
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}
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}
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if (errflg)
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usage();
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if (!app) {
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/*@-nullpass@*/ /* FIX: fm->magicfile may be null */
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ret = fmagicSetup(fm, fm->magicfile, action);
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/*@=nullpass@*/
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if (action)
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exit(ret);
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app = 1;
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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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} else {
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int i, wid, nw;
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for (wid = 0, i = optind; i < argc; i++) {
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nw = strlen(argv[i]);
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if (nw > wid)
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wid = nw;
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}
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for (; optind < argc; optind++) {
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fm->obp = fm->obuf;
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*fm->obp = '\0';
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fm->nob = sizeof(fm->obuf);
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xx = fmagicProcess(fm, argv[optind], wid);
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fprintf(stdout, "%s\n", fm->obuf);
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if (nobuffer)
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(void) fflush(stdout);
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}
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}
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#if HAVE_MCHECK_H && HAVE_MTRACE
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/*@-noeffect@*/
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muntrace(); /* Trace malloc only if MALLOC_TRACE=mtrace-output-file. */
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/*@=noeffect@*/
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#endif
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return 0;
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}
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/*@=bounds@*/
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