biff.c revision 87258 
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
34#include <sys/cdefs.h>
35
36__FBSDID("$FreeBSD: head/usr.bin/biff/biff.c 87258 2001-12-03 01:15:28Z markm $");
37
38#ifndef lint
39static const char copyright[] =
40"@(#) Copyright (c) 1980, 1993\n\
41	The Regents of the University of California.  All rights reserved.\n";
42#endif
43
44#ifndef lint
45static const char sccsid[] = "@(#)biff.c	8.1 (Berkeley) 6/6/93";
46#endif
47
48#include <sys/types.h>
49#include <sys/stat.h>
50#include <errno.h>
51#include <unistd.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55#include <err.h>
56
57static void usage __P((void));
58
59int
60main(argc, argv)
61	int argc;
62	char *argv[];
63{
64	struct stat sb;
65	int ch;
66	char *name;
67
68
69	while ((ch = getopt(argc, argv, "")) != -1)
70		switch(ch) {
71		case '?':
72		default:
73			usage();
74		}
75	argc -= optind;
76	argv += optind;
77
78	if ((name = ttyname(STDERR_FILENO)) == NULL)
79		err(2, "unknown tty");
80
81	if (stat(name, &sb))
82		err(2, "stat");
83
84	if (*argv == NULL) {
85		(void)printf("is %s\n", sb.st_mode & S_IXUSR ? "y" : "n");
86		return(sb.st_mode & S_IXUSR ? 0 : 1);
87	}
88
89	switch(argv[0][0]) {
90	case 'n':
91		if (chmod(name, sb.st_mode & ~S_IXUSR) < 0)
92			err(2, "%s", name);
93		break;
94	case 'y':
95		if (chmod(name, sb.st_mode | S_IXUSR) < 0)
96			err(2, "%s", name);
97		break;
98	default:
99		usage();
100	}
101	return(sb.st_mode & S_IXUSR ? 0 : 1);
102}
103
104static void
105usage()
106{
107	(void)fprintf(stderr, "usage: biff [y | n]\n");
108	exit(2);
109}
110