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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * $FreeBSD: src/usr.bin/biff/biff.c,v 1.6.2.4 2002/08/09 02:56:31 johan Exp $
  34  * $DragonFly: src/usr.bin/biff/biff.c,v 1.4 2005/01/11 19:36:09 liamfoy Exp $
  35  *
  36  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  37  * @(#)biff.c   8.1 (Berkeley) 6/6/93
  38  */
  39
  40 #include <sys/types.h>
  41 #include <sys/stat.h>
  42
  43 #include <err.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <unistd.h>
  47
  48 static void     usage(void);
  49
  50 int
  51 main(int argc, char **argv)
  52 {
  53         struct stat sb;
  54         int ch;
  55         const char *name;
  56
  57
  58         while ((ch = getopt(argc, argv, "")) != -1)
  59                 switch(ch) {
  60                 case '?':
  61                 default:
  62                         usage();
  63                 }
  64         argc -= optind;
  65         argv += optind;
  66
  67         if ((name = ttyname(STDERR_FILENO)) == NULL)
  68                 err(2, "unknown tty");
  69
  70         if (stat(name, &sb))
  71                 err(2, "stat failed");
  72
  73         if (*argv == NULL) {
  74                 printf("is %s\n",
  75                     sb.st_mode & S_IXUSR ? "y" :
  76                     sb.st_mode & S_IXGRP ? "b" : "n");
  77                 return(sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1);
  78         }
  79
  80         switch(argv[0][0]) {
  81         case 'n':
  82                 if (chmod(name, sb.st_mode & ~(S_IXUSR | S_IXGRP)) < 0)
  83                         err(2, "%s", name);
  84                 break;
  85         case 'y':
  86                 if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXUSR) < 0)
  87                         err(2, "%s", name);
  88                 break;
  89         case 'b':
  90                 if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXGRP) < 0)
  91                         err(2, "%s", name);
  92                 break;
  93         default:
  94                 usage();
  95         }
  96         return(sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1);
  97 }
  98
  99 static void
 100 usage(void)
 101 {
 102         fprintf(stderr, "usage: biff [n | y | b]\n");
 103         exit(2);
 104 }