add Berkeley specific copyright

[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 are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley.  The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#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      5.2 (Berkeley) %G%";
#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);
}