1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifndef lint
33static const char copyright[] =
34"@(#) Copyright (c) 1980, 1993\n\
35	The Regents of the University of California.  All rights reserved.\n";
36#endif
37
38#if 0
39#ifndef lint
40static char sccsid[] = "@(#)biff.c	8.1 (Berkeley) 6/6/93";
41#endif
42#endif
43
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD$");
46
47#include <sys/stat.h>
48
49#include <err.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <unistd.h>
53
54static void usage(void);
55
56int
57main(int argc, char *argv[])
58{
59	struct stat sb;
60	int ch;
61	char *name;
62
63
64	while ((ch = getopt(argc, argv, "")) != -1)
65		switch(ch) {
66		case '?':
67		default:
68			usage();
69		}
70	argc -= optind;
71	argv += optind;
72
73	if ((name = ttyname(STDIN_FILENO)) == NULL &&
74	    (name = ttyname(STDOUT_FILENO)) == NULL &&
75	    (name = ttyname(STDERR_FILENO)) == NULL)
76		err(2, "unknown tty");
77
78	if (stat(name, &sb))
79		err(2, "stat");
80
81	if (*argv == NULL) {
82		(void)printf("is %s\n",
83		    sb.st_mode & S_IXUSR ? "y" :
84		    sb.st_mode & S_IXGRP ? "b" : "n");
85		return (sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1);
86
87	}
88
89	switch (argv[0][0]) {
90	case 'n':
91		if (chmod(name, sb.st_mode & ~(S_IXUSR | S_IXGRP)) < 0)
92			err(2, "%s", name);
93		break;
94	case 'y':
95		if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXUSR)
96		    < 0)
97			err(2, "%s", name);
98		break;
99	case 'b':
100		if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXGRP)
101		    < 0)
102			err(2, "%s", name);
103		break;
104	default:
105		usage();
106	}
107	return (sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1);
108}
109
110static void
111usage(void)
112{
113	(void)fprintf(stderr, "usage: biff [n | y | b]\n");
114	exit(2);
115}
116