usr.bin/logname/logname.c

   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\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static 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
  51 int     main __P((int, char **));
  52 void    usage __P((void));
  53
  54 int
  55 main(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
  83 void
  84 usage()
  85 {
  86         (void)fprintf(stderr, "usage: logname\n");
  87         exit(1);
  88 }