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 #include <sys/stat.h>
33
34 #include <err.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <unistd.h>
38
39 static void usage(void) __dead2;
40
41 int
main(int argc,char * argv[])42 main(int argc, char *argv[])
43 {
44 struct stat sb;
45 int ch;
46 char *name;
47
48
49 while ((ch = getopt(argc, argv, "")) != -1)
50 switch(ch) {
51 case '?':
52 default:
53 usage();
54 }
55 argc -= optind;
56 argv += optind;
57
58 if ((name = ttyname(STDIN_FILENO)) == NULL &&
59 (name = ttyname(STDOUT_FILENO)) == NULL &&
60 (name = ttyname(STDERR_FILENO)) == NULL)
61 err(2, "unknown tty");
62
63 if (stat(name, &sb))
64 err(2, "stat");
65
66 if (*argv == NULL) {
67 (void)printf("is %s\n",
68 sb.st_mode & S_IXUSR ? "y" :
69 sb.st_mode & S_IXGRP ? "b" : "n");
70 return (sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1);
71
72 }
73
74 switch (argv[0][0]) {
75 case 'n':
76 if (chmod(name, sb.st_mode & ~(S_IXUSR | S_IXGRP)) < 0)
77 err(2, "%s", name);
78 break;
79 case 'y':
80 if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXUSR)
81 < 0)
82 err(2, "%s", name);
83 break;
84 case 'b':
85 if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXGRP)
86 < 0)
87 err(2, "%s", name);
88 break;
89 default:
90 usage();
91 }
92 return (sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1);
93 }
94
95 static void
usage(void)96 usage(void)
97 {
98 (void)fprintf(stderr, "usage: biff [n | y | b]\n");
99 exit(2);
100 }
101