biff.c revision 100614 
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#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1980, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif
39
40#if 0
41#ifndef lint
42static char sccsid[] = "@(#)biff.c	8.1 (Berkeley) 6/6/93";
43#endif
44#endif
45
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD: head/usr.bin/biff/biff.c 100614 2002-07-24 15:48:17Z robert $");
48
49#include <sys/stat.h>
50
51#include <err.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <unistd.h>
55
56static void usage(void);
57
58int
59main(argc, argv)
60	int argc;
61	char *argv[];
62{
63	struct stat sb;
64	int ch;
65	char *name;
66
67
68	while ((ch = getopt(argc, argv, "")) != -1)
69		switch(ch) {
70		case '?':
71		default:
72			usage();
73		}
74	argc -= optind;
75	argv += optind;
76
77	if ((name = ttyname(STDIN_FILENO)) == NULL &&
78	    (name = ttyname(STDOUT_FILENO)) == NULL &&
79	    (name = ttyname(STDERR_FILENO)) == NULL)
80		err(2, "unknown tty");
81
82	if (stat(name, &sb))
83		err(2, "stat");
84
85	if (*argv == NULL) {
86		(void)printf("is %s\n",
87		    sb.st_mode & S_IXUSR ? "y" :
88		    sb.st_mode & S_IXGRP ? "b" : "n");
89		return(sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1);
90
91	}
92
93	switch(argv[0][0]) {
94	case 'n':
95		if (chmod(name, sb.st_mode & ~(S_IXUSR | S_IXGRP)) < 0)
96			err(2, "%s", name);
97		break;
98	case 'y':
99		if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXUSR) < 0)
100			err(2, "%s", name);
101		break;
102	case 'b':
103		if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXGRP) < 0)
104			err(2, "%s", name);
105		break;
106	default:
107		usage();
108	}
109	return(sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1);
110}
111
112static void
113usage()
114{
115	(void)fprintf(stderr, "usage: biff [n | y | b]\n");
116	exit(2);
117}
118