usr.bin/biff/biff.c

   1 /*      $NetBSD: biff.c,v 1.9 2005/02/17 17:09:47 xtraeme 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 1.9 2005/02/17 17:09:47 xtraeme 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 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 }