BSD 4_3_Tahoe release

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

/*
* Copyright (c) 1983, 1988 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) 1983, 1988 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)hostname.c  5.3 (Berkeley) 6/18/88";
#endif /* not lint */

#include <stdio.h>
#include <sys/param.h>

main(argc,argv)
       int argc;
       char **argv;
{
       extern int optind;
       int ch, sflag;
       char hostname[MAXHOSTNAMELEN], *p, *index();

       sflag = 0;
       while ((ch = getopt(argc, argv, "s")) != EOF)
               switch((char)ch) {
               case 's':
                       sflag = 1;
                       break;
               case '?':
               default:
                       fputs("hostname [-s] [hostname]\n", stderr);
                       exit(1);
               }
       argv += optind;

       if (*argv) {
               if (sethostname(*argv, strlen(*argv))) {
                       perror("sethostname");
                       exit(1);
               }
       } else {
               if (gethostname(hostname, sizeof(hostname))) {
                       perror("gethostname");
                       exit(1);
               }
               if (sflag && (p = index(hostname, '.')))
                       *p = '\0';
               puts(hostname);
       }
       exit(0);
}