logname.c revision 1.8 
1/*	$NetBSD: logname.c,v 1.8 2003/08/07 11:14:26 agc Exp $	*/
2
3/*-
4 * Copyright (c) 1991, 1993, 1994
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. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34__COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\n\
35	The Regents of the University of California.  All rights reserved.\n");
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)logname.c	8.2 (Berkeley) 4/3/94";
41#endif
42__RCSID("$NetBSD: logname.c,v 1.8 2003/08/07 11:14:26 agc Exp $");
43#endif /* not lint */
44
45#include <stdio.h>
46#include <stdlib.h>
47#include <locale.h>
48#include <unistd.h>
49#include <err.h>
50
51int	main __P((int, char **));
52void	usage __P((void));
53
54int
55main(argc, argv)
56	int argc;
57	char *argv[];
58{
59	int ch;
60	char *p;
61
62	setlocale(LC_ALL, "");
63
64	while ((ch = getopt(argc, argv, "")) != -1)
65		switch (ch) {
66		case '?':
67		default:
68			usage();
69			/* NOTREACHED */
70		}
71
72	if (argc != optind) {
73		usage();
74		/* NOTREACHED */
75	}
76
77	if ((p = getlogin()) == NULL)
78		err(1, "getlogin");
79	(void)printf("%s\n", p);
80	exit(0);
81}
82
83void
84usage()
85{
86	(void)fprintf(stderr, "usage: logname\n");
87	exit(1);
88}
89