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114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
/*-
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if 0
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#ifndef lint
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static char const copyright[] =
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"@(#) Copyright (c) 1988, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)hostname.c 8.1 (Berkeley) 5/31/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static void usage(void) __dead2;
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int
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main(int argc, char *argv[])
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{
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int ch, sflag, dflag;
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char *p, hostname[MAXHOSTNAMELEN];
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sflag = 0;
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dflag = 0;
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while ((ch = getopt(argc, argv, "fsd")) != -1)
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switch (ch) {
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case 'f':
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/*
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* On Linux, "hostname -f" prints FQDN.
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* BSD "hostname" always prints FQDN by
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* default, so we accept but ignore -f.
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*/
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break;
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case 's':
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sflag = 1;
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break;
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case 'd':
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dflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc > 1 || (sflag && dflag))
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usage();
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if (*argv) {
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if (sethostname(*argv, (int)strlen(*argv)))
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err(1, "sethostname");
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} else {
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if (gethostname(hostname, (int)sizeof(hostname)))
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err(1, "gethostname");
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if (sflag) {
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p = strchr(hostname, '.');
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if (p != NULL)
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*p = '\0';
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} else if (dflag) {
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p = strchr(hostname, '.');
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if (p != NULL)
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strcpy(hostname, ++p);
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}
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(void)printf("%s\n", hostname);
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}
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exit(0);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: hostname [-f] [-s | -d] [name-of-host]\n");
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exit(1);
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}
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