1 /* $NetBSD: biff.c,v 1.11 2011/08/29 14:24:03 joerg Exp $ */
2
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/cdefs.h>
33 #ifndef lint
34 __COPYRIGHT("@(#) Copyright (c) 1980, 1993\
35 The Regents of the University of California. All rights reserved.");
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)biff.c 8.1 (Berkeley) 6/6/93";
41 #else
42 __RCSID("$NetBSD: biff.c,v 1.11 2011/08/29 14:24:03 joerg Exp $");
43 #endif
44 #endif /* not lint */
45
46 #include <sys/types.h>
47 #include <sys/stat.h>
48
49 #include <err.h>
50 #include <errno.h>
51 #include <stdio.h>
52 #include <stdlib.h>
53 #include <string.h>
54 #include <unistd.h>
55
56 __dead static void usage(void);
57
58 int
main(int argc,char * argv[])59 main(int argc, char *argv[])
60 {
61 struct stat sb;
62 int ch;
63 const char *name;
64
65
66 while ((ch = getopt(argc, argv, "")) != -1)
67 switch(ch) {
68 case '?':
69 default:
70 usage();
71 }
72 argc -= optind;
73 argv += optind;
74
75 if ((name = ttyname(STDERR_FILENO)) == NULL)
76 err(2, "tty");
77
78 if (stat(name, &sb))
79 err(2, "stat");
80
81 if (*argv == NULL) {
82 (void)printf("is %s\n", sb.st_mode&0100 ? "y" : "n");
83 exit(sb.st_mode & 0100 ? 0 : 1);
84 }
85
86 switch(argv[0][0]) {
87 case 'n':
88 if (chmod(name, sb.st_mode & ~0100) < 0)
89 err(2, "%s", name);
90 break;
91 case 'y':
92 if (chmod(name, sb.st_mode | 0100) < 0)
93 err(2, "%s", name);
94 break;
95 default:
96 usage();
97 }
98 exit(sb.st_mode & 0100 ? 0 : 1);
99 }
100
101 static void
usage(void)102 usage(void)
103 {
104 (void)fprintf(stderr, "usage: biff [y | n]\n");
105 exit(2);
106 }
107