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Include OS as part of output; add -k option like SunOS

/*
 * Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by SigmaSoft, Th.  Lockert.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef lint
static char rcsid[] = "$OpenBSD: arch.c,v 1.2 1996/06/29 20:29:34 tholo Exp $";
#endif /* not lint */

#include <stdio.h>
#include <locale.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/utsname.h>
#include <err.h>

static void usage __P((void));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	struct utsname uts;
	char *arch;
	int c;

	setlocale(LC_ALL, "");

	arch = MACHINE_ARCH;
	while ((c = getopt(argc, argv, "k")) != -1)
		switch (c) {
			case 'k':
				arch = MACHINE;
				break;
			default:
				usage();
				/* NOTREASCHED */
		}
	if (optind != argc) {
		usage();
		/* NOTREACHED */
	}
	if (uname(&uts)) {
		err(1, NULL);
		/* NOTREACHED */
	}
	fputs(uts.sysname, stdout);
	fputc('.', stdout);
	fputs(arch, stdout);
	fputc('\n', stdout);
	exit(0);
}

static void
usage()
{
	fprintf(stderr, "usage: arch [-k]\n");
	exit(1);
}