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
35__attribute__((__used__))
36static const char copyright[] =
37"@(#) Copyright (c) 1980, 1993\n\
38	The Regents of the University of California.  All rights reserved.\n";
39#endif
40
41#if 0
42#ifndef lint
43static char sccsid[] = "@(#)biff.c	8.1 (Berkeley) 6/6/93";
44#endif
45#endif
46
47#include <sys/cdefs.h>
48__RCSID("$FreeBSD: src/usr.bin/biff/biff.c,v 1.18 2002/07/24 18:54:59 robert Exp $");
49
50#include <sys/stat.h>
51
52#include <err.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <unistd.h>
56
57static void usage(void);
58
59int
60main(int argc, 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(STDIN_FILENO)) == NULL &&
77	    (name = ttyname(STDOUT_FILENO)) == NULL &&
78	    (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",
86		    sb.st_mode & S_IXUSR ? "y" :
87		    sb.st_mode & S_IXGRP ? "b" : "n");
88		return (sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1);
89
90	}
91
92	switch (argv[0][0]) {
93	case 'n':
94		if (chmod(name, sb.st_mode & ~(S_IXUSR | S_IXGRP)) < 0)
95			err(2, "%s", name);
96		break;
97	case 'y':
98		if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXUSR)
99		    < 0)
100			err(2, "%s", name);
101		break;
102	case 'b':
103		if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXGRP)
104		    < 0)
105			err(2, "%s", name);
106		break;
107	default:
108		usage();
109	}
110	return (sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1);
111}
112
113static void
114usage()
115{
116	(void)fprintf(stderr, "usage: biff [n | y | b]\n");
117	exit(2);
118}
119