usr.bin/biff/biff.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/usr.bin/biff/biff.c,v 1.6.2.4 2002/08/09 02:56:31 johan Exp $
  30  * $DragonFly: src/usr.bin/biff/biff.c,v 1.5 2007/09/16 00:59:59 pavalos Exp $
  31  *
  32  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  33  * @(#)biff.c   8.1 (Berkeley) 6/6/93
  34  */
  35
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38
  39 #include <err.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43
  44 static void     usage(void);
  45
  46 int
  47 main(int argc, char **argv)
  48 {
  49         struct stat sb;
  50         int ch;
  51         const char *name;
  52
  53
  54         while ((ch = getopt(argc, argv, "")) != -1)
  55                 switch(ch) {
  56                 case '?':
  57                 default:
  58                         usage();
  59                 }
  60         argc -= optind;
  61         argv += optind;
  62
  63         if ((name = ttyname(STDIN_FILENO)) == NULL &&
  64             (name = ttyname(STDOUT_FILENO)) == NULL &&
  65             (name = ttyname(STDERR_FILENO)) == NULL)
  66                 err(2, "unknown tty");
  67
  68         if (stat(name, &sb))
  69                 err(2, "stat failed");
  70
  71         if (*argv == NULL) {
  72                 printf("is %s\n",
  73                     sb.st_mode & S_IXUSR ? "y" :
  74                     sb.st_mode & S_IXGRP ? "b" : "n");
  75                 return(sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1);
  76         }
  77
  78         switch(argv[0][0]) {
  79         case 'n':
  80                 if (chmod(name, sb.st_mode & ~(S_IXUSR | S_IXGRP)) < 0)
  81                         err(2, "%s", name);
  82                 break;
  83         case 'y':
  84                 if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXUSR) < 0)
  85                         err(2, "%s", name);
  86                 break;
  87         case 'b':
  88                 if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXGRP) < 0)
  89                         err(2, "%s", name);
  90                 break;
  91         default:
  92                 usage();
  93         }
  94         return(sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1);
  95 }
  96
  97 static void
  98 usage(void)
  99 {
 100         fprintf(stderr, "usage: biff [n | y | b]\n");
 101         exit(2);
 102 }