biff.c revision 1.4 
1/*	$NetBSD: biff.c,v 1.4 1997/10/18 12:20:34 lukem Exp $	*/
2
3/*
4 * Copyright (c) 1980, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, 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.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#ifndef lint
38__COPYRIGHT("@(#) Copyright (c) 1980, 1993\n\
39	The Regents of the University of California.  All rights reserved.\n");
40#endif /* not lint */
41
42#ifndef lint
43#if 0
44static char sccsid[] = "@(#)biff.c	8.1 (Berkeley) 6/6/93";
45#else
46__RCSID("$NetBSD: biff.c,v 1.4 1997/10/18 12:20:34 lukem Exp $");
47#endif
48#endif /* not lint */
49
50#include <sys/types.h>
51#include <sys/stat.h>
52
53#include <err.h>
54#include <errno.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <unistd.h>
59
60static void usage __P((void));
61int main __P((int, char **));
62
63int
64main(argc, argv)
65	int argc;
66	char *argv[];
67{
68	struct stat sb;
69	int ch;
70	char *name;
71
72
73	while ((ch = getopt(argc, argv, "")) != EOF)
74		switch(ch) {
75		case '?':
76		default:
77			usage();
78		}
79	argc -= optind;
80	argv += optind;
81
82	if ((name = ttyname(STDERR_FILENO)) == NULL)
83		err(2, "tty");
84
85	if (stat(name, &sb))
86		err(2, "stat");
87
88	if (*argv == NULL) {
89		(void)printf("is %s\n", sb.st_mode&0100 ? "y" : "n");
90		exit(sb.st_mode & 0100 ? 0 : 1);
91	}
92
93	switch(argv[0][0]) {
94	case 'n':
95		if (chmod(name, sb.st_mode & ~0100) < 0)
96			err(2, name);
97		break;
98	case 'y':
99		if (chmod(name, sb.st_mode | 0100) < 0)
100			err(2, name);
101		break;
102	default:
103		usage();
104	}
105	exit(sb.st_mode & 0100 ? 0 : 1);
106}
107
108static void
109usage()
110{
111	(void)fprintf(stderr, "usage: biff [y | n]\n");
112	exit(2);
113}
114