/*      $NetBSD: logname.c,v 1.10 2011/09/04 20:29:12 joerg Exp $       */

/*-
* Copyright (c) 1991, 1993, 1994
*      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
*    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>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\
The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)logname.c   8.2 (Berkeley) 4/3/94";
#endif
__RCSID("$NetBSD: logname.c,v 1.10 2011/09/04 20:29:12 joerg Exp $");
#endif /* not lint */

#include <stdio.h>
#include <stdlib.h>
#include <locale.h>
#include <unistd.h>
#include <err.h>

__dead  static void     usage(void);

int
main(int argc, char *argv[])
{
       int ch;
       char *p;

       setlocale(LC_ALL, "");

       while ((ch = getopt(argc, argv, "")) != -1)
               switch (ch) {
               case '?':
               default:
                       usage();
                       /* NOTREACHED */
               }

       if (argc != optind) {
               usage();
               /* NOTREACHED */
       }

       if ((p = getlogin()) == NULL)
               err(1, "getlogin");
       (void)printf("%s\n", p);
       exit(0);
}

static void
usage(void)
{
       (void)fprintf(stderr, "usage: logname\n");
       exit(1);
}