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hostname.c revision 1.14 
      1 /* $NetBSD: hostname.c,v 1.14 2001/09/16 13:48:35 wiz Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1988, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __COPYRIGHT("@(#) Copyright (c) 1988, 1993\n\
     39 	The Regents of the University of California.  All rights reserved.\n");
     40 #endif /* not lint */
     41 
     42 #ifndef lint
     43 #if 0
     44 static char sccsid[] = "@(#)hostname.c	8.2 (Berkeley) 4/28/95";
     45 #else
     46 __RCSID("$NetBSD: hostname.c,v 1.14 2001/09/16 13:48:35 wiz Exp $");
     47 #endif
     48 #endif /* not lint */
     49 
     50 #include <sys/param.h>
     51 
     52 #include <err.h>
     53 #include <stdio.h>
     54 #include <stdlib.h>
     55 #include <string.h>
     56 #include <unistd.h>
     57 
     58 void usage(void);
     59 int main(int, char *[]);
     60 
     61 int
     62 main(int argc, char *argv[])
     63 {
     64 	int ch, sflag;
     65 	char *p, hostname[MAXHOSTNAMELEN + 1];
     66 
     67 	setprogname(argv[0]);
     68 	sflag = 0;
     69 	while ((ch = getopt(argc, argv, "s")) != -1)
     70 		switch (ch) {
     71 		case 's':
     72 			sflag = 1;
     73 			break;
     74 		case '?':
     75 		default:
     76 			usage();
     77 		}
     78 	argc -= optind;
     79 	argv += optind;
     80 
     81 	if (argc > 1)
     82 		usage();
     83 
     84 	if (*argv) {
     85 		if (sethostname(*argv, strlen(*argv)))
     86 			err(1, "sethostname");
     87 	} else {
     88 		if (gethostname(hostname, sizeof(hostname)))
     89 			err(1, "gethostname");
     90 		hostname[sizeof(hostname) - 1] = '\0';
     91 		if (sflag && (p = strchr(hostname, '.')))
     92 			*p = '\0';
     93 		(void)printf("%s\n", hostname);
     94 	}
     95 	exit(0);
     96 	/* NOTREACHED */
     97 }
     98 
     99 void
    100 usage(void)
    101 {
    102 	(void)fprintf(stderr, "usage: %s [-s] [name-of-host]\n",
    103 	    getprogname());
    104 	exit(1);
    105 	/* NOTREACHED */
    106 }
    107