NetBSD/usr.bin/logname/logname.c

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/* $NetBSD: logname.c,v 1.8 2003/08/07 11:14:26 agc Exp $ */
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/*-
* Copyright (c) 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
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*
* 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. 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
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*/
#include <sys/cdefs.h>
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#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)logname.c 8.2 (Berkeley) 4/3/94";
#endif
__RCSID("$NetBSD: logname.c,v 1.8 2003/08/07 11:14:26 agc Exp $");
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#endif /* not lint */
#include <stdio.h>
#include <stdlib.h>
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#include <locale.h>
#include <unistd.h>
#include <err.h>
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int main __P((int, char **));
void usage __P((void));
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int
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main(argc, argv)
int argc;
char *argv[];
{
int ch;
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char *p;
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setlocale(LC_ALL, "");
while ((ch = getopt(argc, argv, "")) != -1)
switch (ch) {
case '?':
default:
usage();
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/* NOTREACHED */
}
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if (argc != optind) {
usage();
/* NOTREACHED */
}
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if ((p = getlogin()) == NULL)
err(1, "getlogin");
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(void)printf("%s\n", p);
exit(0);
}
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void
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usage()
{
(void)fprintf(stderr, "usage: logname\n");
exit(1);
}