biff.c revision 62889 
1/*
2 * Copyright (c) 1980, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD: head/usr.bin/biff/biff.c 62889 2000-07-10 08:42:58Z kris $
34 */
35
36#ifndef lint
37static const char copyright[] =
38"@(#) 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
43static const char sccsid[] = "@(#)biff.c	8.1 (Berkeley) 6/6/93";
44#endif /* not lint */
45
46#include <sys/types.h>
47#include <sys/stat.h>
48#include <errno.h>
49#include <unistd.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <string.h>
53#include <err.h>
54
55static void usage __P((void));
56
57int
58main(argc, argv)
59	int argc;
60	char *argv[];
61{
62	struct stat sb;
63	int ch;
64	char *name;
65
66
67	while ((ch = getopt(argc, argv, "")) != -1)
68		switch(ch) {
69		case '?':
70		default:
71			usage();
72		}
73	argc -= optind;
74	argv += optind;
75
76	if ((name = ttyname(STDERR_FILENO)) == NULL)
77		err(2, "unknown tty");
78
79	if (stat(name, &sb))
80		err(2, "stat");
81
82	if (*argv == NULL) {
83		(void)printf("is %s\n", sb.st_mode&0100 ? "y" : "n");
84		return(sb.st_mode & 0100 ? 0 : 1);
85	}
86
87	switch(argv[0][0]) {
88	case 'n':
89		if (chmod(name, sb.st_mode & ~0100) < 0)
90			err(2, "%s", name);
91		break;
92	case 'y':
93		if (chmod(name, sb.st_mode | 0100) < 0)
94			err(2, "%s", name);
95		break;
96	default:
97		usage();
98	}
99	return(sb.st_mode & 0100 ? 0 : 1);
100}
101
102static void
103usage()
104{
105	(void)fprintf(stderr, "usage: biff [y | n]\n");
106	exit(2);
107}
108