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      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
     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
    102 usage(void)
    103 {
    104 	(void)fprintf(stderr, "usage: biff [y | n]\n");
    105 	exit(2);
    106 }
    107