BSD 4_3_Net_2 release

[unix-history] / usr / src / usr.bin / biff / biff.c

/*
* Copyright (c) 1980 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)biff.c      5.3 (Berkeley) 6/1/90";
#endif /* not lint */

/*
* biff
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>

char    *ttyname();

main(argc, argv)
       int argc;
       char **argv;
{
       char *cp = ttyname(2);
       struct stat stb;

       argc--, argv++;
       if (cp == 0)
               fprintf(stderr, "Where are you?\n"), exit(1);
       if (stat(cp, &stb) < 0)
               perror(cp), exit(1);
       if (argc == 0) {
               printf("is %s\n", stb.st_mode&0100 ? "y" : "n");
               exit((stb.st_mode&0100) ? 0 : 1);
       }
       switch (argv[0][0]) {

       case 'y':
               if (chmod(cp, stb.st_mode|0100) < 0)
                       perror(cp);
               break;

       case 'n':
               if (chmod(cp, stb.st_mode&~0100) < 0)
                       perror(cp);
               break;

       default:
               fprintf(stderr, "usage: biff [y] [n]\n");
       }
       exit((stb.st_mode&0100) ? 0 : 1);
}