/*
 * hostname - set or print name of current host system
 *
 * Gunnar Ritter, Freiburg i. Br., Germany, October 2003.
 */
/*
 * Copyright (c) 2003 Gunnar Ritter
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute
 * it freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */

#if __GNUC__ >= 3 && __GNUC_MINOR__ >= 4 || __GNUC__ >= 4
#define	USED	__attribute__ ((used))
#elif defined __GNUC__
#define	USED	__attribute__ ((unused))
#else
#define	USED
#endif
static const char sccsid[] USED = "@(#)hostname.sl	1.3 (gritter) 5/29/05";

#include <sys/utsname.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <libgen.h>

static const char	*progname;

int
main(int argc, char **argv)
{
	progname = basename(argv[0]);
	if (argc > 1 && argv[1][0]=='-' && argv[1][1]=='-' && argv[1][2]=='\0')
		argc--, argv++;
	if (argc == 1) {
		struct utsname	u;

		if (uname(&u) < 0) {
			perror("uname");
			return 1;
		}
		puts(u.nodename);
	} else if (argc == 2) {
		if (sethostname(argv[1], strlen(argv[1]))) {
			perror("sethostname");
			return 1;
		}
	} else {
		fprintf(stderr, "Usage: %s [name]\n", progname);
		return 2;
	}
	return 0;
}