logname/logname.c

   1 /*      $NetBSD: logname.c,v 1.7 1997/10/19 04:20:06 lukem 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. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 __COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\n\
  39         The Regents of the University of California.  All rights reserved.\n");
  40 #endif /* not lint */
  41
  42 #ifndef lint
  43 #if 0
  44 static char sccsid[] = "@(#)logname.c   8.2 (Berkeley) 4/3/94";
  45 #endif
  46 __RCSID("$NetBSD: logname.c,v 1.7 1997/10/19 04:20:06 lukem Exp $");
  47 #endif /* not lint */
  48
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <locale.h>
  52 #include <unistd.h>
  53 #include <err.h>
  54
  55 int     main __P((int, char **));
  56 void    usage __P((void));
  57
  58 int
  59 main(argc, argv)
  60         int argc;
  61         char *argv[];
  62 {
  63         int ch;
  64         char *p;
  65
  66         setlocale(LC_ALL, "");
  67
  68         while ((ch = getopt(argc, argv, "")) != -1)
  69                 switch (ch) {
  70                 case '?':
  71                 default:
  72                         usage();
  73                         /* NOTREACHED */
  74                 }
  75
  76         if (argc != optind) {
  77                 usage();
  78                 /* NOTREACHED */
  79         }
  80
  81         if ((p = getlogin()) == NULL)
  82                 err(1, "getlogin");
  83         (void)printf("%s\n", p);
  84         exit(0);
  85 }
  86
  87 void
  88 usage()
  89 {
  90         (void)fprintf(stderr, "usage: logname\n");
  91         exit(1);
  92 }