/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * 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, 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
/*static char sccsid[] = "from: @(#)chmod.c	5.21 (Berkeley) 1/27/92";*/
static char rcsid[] = "$Id: chmod.c,v 1.8 1994/02/11 02:57:24 cgd Exp $";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fts.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int retval;

void err __P((const char *, ...));
void error __P((char *));
void usage __P((void));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	register FTS *fts;
	register FTSENT *p;
	register int oct, omode;
	struct stat sb;
	mode_t *set;
	int ch, fflag, rflag;
	char *ep, *mode;

	fflag = rflag = 0;
	while ((ch = getopt(argc, argv, "Rfrwx")) != EOF)
		switch((char)ch) {
		case 'R':
			rflag = 1;
			break;
		case 'f':		/* no longer documented */
			fflag = 1;
			break;
		case 'r':		/* "-[rwx]" are valid file modes */
		case 'w':
		case 'x':
		case 'u':		/* as are -[ugo] */
		case 'g':
		case 'o':
		case 'X':		/* -[Xts] valid but ignored later */
		case 't':
		case 's':
			--optind;
			goto done;
		case '?':
		default:
			usage();
		}
done:	argv += optind;
	argc -= optind;

	if (argc < 2)
		usage();

	mode = *argv;
	if (*mode >= '0' && *mode <= '7') {
		omode = (int)strtol(mode, &ep, 8);
		if (omode < 0 || *ep)
			err("invalid file mode: %s", mode);
		oct = 1;
	} else {
		if (!(set = setmode(mode)))
			err("invalid file mode: %s", mode);
		oct = 0;
	}

	retval = 0;
	if (rflag) {
		if ((fts = fts_open(++argv, FTS_PHYSICAL, 0)) == NULL)
			err("%s", strerror(errno));
		while (p = fts_read(fts))
			switch(p->fts_info) {
			case FTS_D:
			case FTS_SL:
				break;
			case FTS_DNR:
			case FTS_ERR:
			case FTS_NS:
				err("%s: %s", p->fts_path, strerror(errno));
			default:
				if (chmod(p->fts_accpath, oct ? omode :
				    getmode(set, p->fts_statp->st_mode)) &&
				    !fflag)
					error(p->fts_path);
				break;
			}
		exit(retval);
	}
	while (*++argv) {
		if (lstat(*argv, &sb) < 0) {
			if (!fflag)
				error(*argv);
			continue;
		}
		if (S_ISLNK(sb.st_mode))
			continue;
		if (chmod(*argv, oct ? omode : getmode(set, sb.st_mode)) &&
		    !fflag)
			error(*argv);
	}
	exit(retval);
}

void
error(name)
	char *name;
{
	(void)fprintf(stderr, "chmod: %s: %s\n", name, strerror(errno));
	retval = 1;
}

void
usage()
{
	(void)fprintf(stderr, "usage: chmod [-R] mode file ...\n");
	exit(1);
}

#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

void
#if __STDC__
err(const char *fmt, ...)
#else
err(fmt, va_alist)
	char *fmt;
        va_dcl
#endif
{
	va_list ap;
#if __STDC__
	va_start(ap, fmt);
#else
	va_start(ap);
#endif
	(void)fprintf(stderr, "chmod: ");
	(void)vfprintf(stderr, fmt, ap);
	va_end(ap);
	(void)fprintf(stderr, "\n");
	exit(1);
	/* NOTREACHED */
}