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

/*
* Copyright (c) 1980 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#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      5.4 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static void usage __P((void));
static void err __P((char *));

main(argc, argv)
       int argc;
       char *argv[];
{
       struct stat sb;
       int ch;
       char *name;


       while ((ch = getopt(argc, argv, "")) != EOF)
               switch(ch) {
               case '?':
               default:
                       usage();
               }
       argc -= optind;
       argv += optind;

       if ((name = ttyname(STDERR_FILENO)) == NULL) {
               (void)fprintf(stderr, "biff: unknown tty\n");
               exit(2);
       }

       if (stat(name, &sb))
               err(name);

       if (*argv == NULL) {
               (void)printf("is %s\n", sb.st_mode&0100 ? "y" : "n");
               exit(sb.st_mode & 0100 ? 0 : 1);
       }

       switch(argv[0][0]) {
       case 'n':
               if (chmod(name, sb.st_mode & ~0100) < 0)
                       err(name);
               break;
       case 'y':
               if (chmod(name, sb.st_mode | 0100) < 0)
                       err(name);
               break;
       default:
               usage();
       }
       exit(sb.st_mode & 0100 ? 0 : 1);
}

static void
err(name)
       char *name;
{
       (void)fprintf(stderr, "biff: %s: %s\n", name, strerror(errno));
       exit(2);
}

static void
usage()
{
       (void)fprintf(stderr, "usage: biff [y | n]\n");
       exit(2);
}