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/bin/hostname/hostname.c

https://bitbucket.org/freebsd/freebsd-head/
C | 105 lines | 61 code | 11 blank | 33 comment | 11 complexity | 892989362712dce48512b95fc3681bf3 MD5 | raw file
  1/*-
  2 * Copyright (c) 1988, 1993
  3 *	The Regents of the University of California.  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 * 4. Neither the name of the University nor the names of its contributors
 14 *    may be used to endorse or promote products derived from this software
 15 *    without specific prior written permission.
 16 *
 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 27 * SUCH DAMAGE.
 28 */
 29
 30#if 0
 31#ifndef lint
 32static char const copyright[] =
 33"@(#) Copyright (c) 1988, 1993\n\
 34	The Regents of the University of California.  All rights reserved.\n";
 35#endif /* not lint */
 36
 37#ifndef lint
 38static char sccsid[] = "@(#)hostname.c	8.1 (Berkeley) 5/31/93";
 39#endif /* not lint */
 40#endif
 41#include <sys/cdefs.h>
 42__FBSDID("$FreeBSD$");
 43
 44#include <sys/param.h>
 45
 46#include <err.h>
 47#include <stdio.h>
 48#include <stdlib.h>
 49#include <string.h>
 50#include <unistd.h>
 51
 52static void usage(void);
 53
 54int
 55main(int argc, char *argv[])
 56{
 57	int ch, sflag;
 58	char *p, hostname[MAXHOSTNAMELEN];
 59
 60	sflag = 0;
 61	while ((ch = getopt(argc, argv, "fs")) != -1)
 62		switch (ch) {
 63		case 'f':
 64			/*
 65			 * On Linux, "hostname -f" prints FQDN.
 66			 * BSD "hostname" always prints FQDN by
 67			 * default, so we accept but ignore -f.
 68			 */
 69			break;
 70		case 's':
 71			sflag = 1;
 72			break;
 73		case '?':
 74		default:
 75			usage();
 76		}
 77	argc -= optind;
 78	argv += optind;
 79
 80	if (argc > 1)
 81		usage();
 82
 83	if (*argv) {
 84		if (sethostname(*argv, (int)strlen(*argv)))
 85			err(1, "sethostname");
 86	} else {
 87		if (gethostname(hostname, (int)sizeof(hostname)))
 88			err(1, "gethostname");
 89		if (sflag) {
 90			p = strchr(hostname, '.');
 91			if (p != NULL)
 92				*p = '\0';
 93		}
 94		(void)printf("%s\n", hostname);
 95	}
 96	exit(0);
 97}
 98
 99static void
100usage(void)
101{
102
103	(void)fprintf(stderr, "usage: hostname [-fs] [name-of-host]\n");
104	exit(1);
105}