BSD 4_2 release

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

#ifndef lint
static char *sccsid ="@(#)biff.c        4.2 (Berkeley) 7/2/83";
#endif
/*
* 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);
}