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