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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: file.c,v 1.22 2009/10/27 23:59:37 deraadt Exp $ */
/*
 * Copyright (c) Ian F. Darwin 1986-1995.
 * Software written by Ian F. Darwin and others;
 * maintained 1995-present by Christos Zoulas and others.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice immediately at the beginning of the file, without modification,
 *    this list of conditions, and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
/*
 * file - find type of a file or files - main program.
 */

#include <sys/types.h>
#include <sys/param.h>	/* for MAXPATHLEN */
#include <sys/stat.h>

#include "file.h"
#include "magic.h"

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#ifdef RESTORE_TIME
# if (__COHERENT__ >= 0x420)
#  include <sys/utime.h>
# else
#  ifdef USE_UTIMES
#   include <sys/time.h>
#  else
#   include <utime.h>
#  endif
# endif
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>	/* for read() */
#endif
#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif
#ifdef HAVE_WCHAR_H
#include <wchar.h>
#endif

#include <getopt.h>
#ifndef HAVE_GETOPT_LONG
int getopt_long(int argc, char * const *argv, const char *optstring, const struct option *longopts, int *longindex);
#endif

#include <netinet/in.h>		/* for byte swapping */

#include "patchlevel.h"


#ifdef S_IFLNK
#define SYMLINKFLAG "Lh"
#else
#define SYMLINKFLAG ""
#endif

# define USAGE  "Usage: %s [-bcik" SYMLINKFLAG "nNprsvz0] [-e test] [-f namefile] [-F separator] [-m magicfiles] file...\n" \
		"       %s -C -m magicfiles\n"

#ifndef MAXPATHLEN
#define	MAXPATHLEN	512
#endif

private int 		/* Global command-line options 		*/
	bflag = 0,	/* brief output format	 		*/
	nopad = 0,	/* Don't pad output			*/
	nobuffer = 0,   /* Do not buffer stdout 		*/
	nulsep = 0;	/* Append '\0' to the separator		*/

private const char *magicfile = 0;	/* where the magic is	*/
private const char *default_magicfile = MAGIC;
private const char *separator = ":";	/* Default field separator	*/

extern char *__progname;		/* used throughout 		*/

private struct magic_set *magic;

private void unwrap(char *);
private void usage(void);
private void help(void);

int main(int, char *[]);
private void process(const char *, int);
private void load(const char *, int);


/*
 * main - parse arguments and handle options
 */
int
main(int argc, char *argv[])
{
	int c;
	size_t i;
	int action = 0, didsomefiles = 0, errflg = 0;
	int flags = 0;
	char *home, *usermagic;
	struct stat sb;
	static const char hmagic[] = "/.magic";
#define OPTSTRING	"bcCde:f:F:hikLm:nNprsvz0"
	int longindex;
	static const struct option long_options[] =
	{
#define OPT(shortname, longname, opt, doc)      \
    {longname, opt, NULL, shortname},
#define OPT_LONGONLY(longname, opt, doc)        \
    {longname, opt, NULL, 0},
#include "file_opts.h"
#undef OPT
#undef OPT_LONGONLY
    {0, 0, NULL, 0}
};

	static const struct {
		const char *name;
		int value;
	} nv[] = {
		{ "apptype",	MAGIC_NO_CHECK_APPTYPE },
		{ "ascii",	MAGIC_NO_CHECK_ASCII },
		{ "compress",	MAGIC_NO_CHECK_COMPRESS },
		{ "elf",	MAGIC_NO_CHECK_ELF },
		{ "soft",	MAGIC_NO_CHECK_SOFT },
		{ "tar",	MAGIC_NO_CHECK_TAR },
		{ "tokens",	MAGIC_NO_CHECK_TOKENS },
	};

	/* makes islower etc work for other langs */
	(void)setlocale(LC_CTYPE, "");

#ifdef __EMX__
	/* sh-like wildcard expansion! Shouldn't hurt at least ... */
	_wildcard(&argc, &argv);
#endif

	magicfile = default_magicfile;
	if ((usermagic = getenv("MAGIC")) != NULL)
		magicfile = usermagic;
	else
		if ((home = getenv("HOME")) != NULL) {
			size_t len = strlen(home) + sizeof(hmagic);
			if ((usermagic = malloc(len)) != NULL) {
				(void)strlcpy(usermagic, home, len);
				(void)strlcat(usermagic, hmagic, len);
				if (stat(usermagic, &sb)<0) 
					free(usermagic);
				else
					magicfile = usermagic;
			}
		}

#ifdef S_IFLNK
	flags |= getenv("POSIXLY_CORRECT") ? MAGIC_SYMLINK : 0;
#endif
	while ((c = getopt_long(argc, argv, OPTSTRING, long_options,
	    &longindex)) != -1)
		switch (c) {
		case 0 :
			switch (longindex) {
			case 0:
				help();
				break;
			case 10:
				flags |= MAGIC_MIME_TYPE;
				break;
			case 11:
				flags |= MAGIC_MIME_ENCODING;
				break;
			}
			break;
		case '0':
			nulsep = 1;
			break;
		case 'b':
			bflag++;
			break;
		case 'c':
			action = FILE_CHECK;
			break;
		case 'C':
			action = FILE_COMPILE;
			break;
		case 'd':
			flags |= MAGIC_DEBUG|MAGIC_CHECK;
			break;
		case 'e':
			for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++)
				if (strcmp(nv[i].name, optarg) == 0)
					break;

			if (i == sizeof(nv) / sizeof(nv[0]))
				errflg++;
			else
				flags |= nv[i].value;
			break;
			
		case 'f':
			if(action)
				usage();
			load(magicfile, flags);
			unwrap(optarg);
			++didsomefiles;
			break;
		case 'F':
			separator = optarg;
			break;
		case 'i':
			flags |= MAGIC_MIME;
			break;
		case 'k':
			flags |= MAGIC_CONTINUE;
			break;
		case 'm':
			magicfile = optarg;
			break;
		case 'n':
			++nobuffer;
			break;
		case 'N':
			++nopad;
			break;
#if defined(HAVE_UTIME) || defined(HAVE_UTIMES)
		case 'p':
			flags |= MAGIC_PRESERVE_ATIME;
			break;
#endif
		case 'r':
			flags |= MAGIC_RAW;
			break;
		case 's':
			flags |= MAGIC_DEVICES;
			break;
		case 'v':
			(void)fprintf(stderr, "%s-%d.%.2d\n", __progname,
				       FILE_VERSION_MAJOR, patchlevel);
			(void)fprintf(stderr, "magic file from %s\n",
				       magicfile);
			return 1;
		case 'z':
			flags |= MAGIC_COMPRESS;
			break;
#ifdef S_IFLNK
		case 'L':
			flags |= MAGIC_SYMLINK;
			break;
		case 'h':
			flags &= ~MAGIC_SYMLINK;
			break;
#endif
		case '?':
		default:
			errflg++;
			break;
		}

	if (errflg) {
		usage();
	}

	switch(action) {
	case FILE_CHECK:
	case FILE_COMPILE:
		magic = magic_open(flags|MAGIC_CHECK);
		if (magic == NULL) {
			(void)fprintf(stderr, "%s: %s\n", __progname,
			    strerror(errno));
			return 1;
		}
		c = action == FILE_CHECK ? magic_check(magic, magicfile) :
		    magic_compile(magic, magicfile);
		if (c == -1) {
			(void)fprintf(stderr, "%s: %s\n", __progname,
			    magic_error(magic));
			return -1;
		}
		return 0;
	default:
		load(magicfile, flags);
		break;
	}

	if (optind == argc) {
		if (!didsomefiles) {
			usage();
		}
	}
	else {
		size_t j, wid, nw;
		for (wid = 0, j = (size_t)optind; j < (size_t)argc; j++) {
			nw = file_mbswidth(argv[j]);
			if (nw > wid)
				wid = nw;
		}
		/*
		 * If bflag is only set twice, set it depending on
		 * number of files [this is undocumented, and subject to change]
		 */
		if (bflag == 2) {
			bflag = optind >= argc - 1;
		}
		for (; optind < argc; optind++)
			process(argv[optind], wid);
	}

	c = magic->haderr ? 1 : 0;
	magic_close(magic);
	return c;
}


private void
/*ARGSUSED*/
load(const char *m, int flags)
{
	if (magic || m == NULL)
		return;
	magic = magic_open(flags);
	if (magic == NULL) {
		(void)fprintf(stderr, "%s: %s\n", __progname, strerror(errno));
		exit(1);
	}
	if (magic_load(magic, magicfile) == -1) {
		(void)fprintf(stderr, "%s: %s\n",
		    __progname, magic_error(magic));
		exit(1);
	}
}

/*
 * unwrap -- read a file of filenames, do each one.
 */
private void
unwrap(char *fn)
{
	char buf[MAXPATHLEN];
	FILE *f;
	int wid = 0, cwid;

	if (strcmp("-", fn) == 0) {
		f = stdin;
		wid = 1;
	} else {
		if ((f = fopen(fn, "r")) == NULL) {
			(void)fprintf(stderr, "%s: Cannot open `%s' (%s).\n",
			    __progname, fn, strerror(errno));
			exit(1);
		}

		while (fgets(buf, sizeof(buf), f) != NULL) {
			buf[strcspn(buf, "\n")] = '\0';
			cwid = file_mbswidth(buf);
			if (cwid > wid)
				wid = cwid;
		}

		rewind(f);
	}

	while (fgets(buf, sizeof(buf), f) != NULL) {
		buf[strcspn(buf, "\n")] = '\0';
		process(buf, wid);
		if(nobuffer)
			(void)fflush(stdout);
	}

	(void)fclose(f);
}

/*
 * Called for each input file on the command line (or in a list of files)
 */
private void
process(const char *inname, int wid)
{
	const char *type;
	int std_in = strcmp(inname, "-") == 0;

	if (wid > 0 && !bflag) {
		(void)printf("%s", std_in ? "/dev/stdin" : inname);
		if (nulsep)
			(void)putc('\0', stdout);
		else
			(void)printf("%s", separator);
		(void)printf("%*s ",
		    (int) (nopad ? 0 : (wid - file_mbswidth(inname))), "");
	}

	type = magic_file(magic, std_in ? NULL : inname);
	if (type == NULL)
		(void)printf("ERROR: %s\n", magic_error(magic));
	else
		(void)printf("%s\n", type);
}

size_t
file_mbswidth(const char *s)
{
#if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
	size_t bytesconsumed, old_n, n, width = 0;
	mbstate_t state;
	wchar_t nextchar;
	(void)memset(&state, 0, sizeof(mbstate_t));
	old_n = n = strlen(s);

	while (n > 0) {
		bytesconsumed = mbrtowc(&nextchar, s, n, &state);
		if (bytesconsumed == (size_t)(-1) ||
		    bytesconsumed == (size_t)(-2)) {
			/* Something went wrong, return something reasonable */
			return old_n;
		}
		if (s[0] == '\n') {
			/*
			 * do what strlen() would do, so that caller
			 * is always right
			 */
			width++;
		} else
			width += wcwidth(nextchar);

		s += bytesconsumed, n -= bytesconsumed;
	}
	return width;
#else
	return strlen(s);
#endif
}

private void
usage(void)
{
	(void)fprintf(stderr, USAGE, __progname, __progname);
	(void)fputs("Try `file --help' for more information.\n", stderr);
	exit(1);
}

private void
help(void)
{
	(void)fputs(
"Usage: file [OPTION...] [FILE...]\n"
"Determine type of FILEs.\n"
"\n", stderr);
#define OPT(shortname, longname, opt, doc)      \
        fprintf(stderr, "  -%c, --" longname doc, shortname);
#define OPT_LONGONLY(longname, opt, doc)        \
        fprintf(stderr, "      --" longname doc);
#include "file_opts.h"
#undef OPT
#undef OPT_LONGONLY
	exit(0);
}