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hostname.c revision 1.4 
      1 /*
      2  * Copyright (c) 1983, 1988 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 char copyright[] =
     36 "@(#) Copyright (c) 1983, 1988 Regents of the University of California.\n\
     37  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 /*static char sccsid[] = "from: @(#)hostname.c	5.4 (Berkeley) 5/31/90";*/
     42 static char rcsid[] = "$Id: hostname.c,v 1.4 1993/08/01 18:59:40 mycroft Exp $";
     43 #endif /* not lint */
     44 
     45 #include <stdio.h>
     46 #include <sys/param.h>
     47 
     48 main(argc,argv)
     49 	int argc;
     50 	char **argv;
     51 {
     52 	extern int optind;
     53 	int ch, sflag;
     54 	char hostname[MAXHOSTNAMELEN], *p, *index();
     55 
     56 	sflag = 0;
     57 	while ((ch = getopt(argc, argv, "s")) != EOF)
     58 		switch((char)ch) {
     59 		case 's':
     60 			sflag = 1;
     61 			break;
     62 		case '?':
     63 		default:
     64 			fputs("hostname [-s] [hostname]\n", stderr);
     65 			exit(1);
     66 		}
     67 	argv += optind;
     68 
     69 	if (*argv) {
     70 		if (sethostname(*argv, strlen(*argv))) {
     71 			perror("sethostname");
     72 			exit(1);
     73 		}
     74 	} else {
     75 		if (gethostname(hostname, sizeof(hostname))) {
     76 			perror("gethostname");
     77 			exit(1);
     78 		}
     79 		if (sflag && (p = index(hostname, '.')))
     80 			*p = '\0';
     81 		puts(hostname);
     82 	}
     83 	exit(0);
     84 }
     85