usr.bin/logname/logname.c

   1 /*-
   2  * Copyright (c) 1991, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1991, 1993, 1994 The Regents of the University of California.  All rights reserved.
  30  * @(#)logname.c        8.2 (Berkeley) 4/3/94
  31  *
  32  * $DragonFly: src/usr.bin/logname/logname.c,v 1.5 2004/12/13 14:08:44 liamfoy Exp $
  33  */
  34
  35 #include <err.h>
  36 #include <locale.h>
  37 #include <unistd.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40
  41 static void     usage(void);
  42
  43 int
  44 main(int argc, char **argv)
  45 {
  46         int ch;
  47         char *p;
  48
  49         setlocale(LC_ALL, "");
  50
  51         while ((ch = getopt(argc, argv, "")) != -1)
  52                 switch (ch) {
  53                 case '?':
  54                 default:
  55                         usage();
  56                 }
  57         argc -= optind;
  58         argv += optind;
  59
  60         if ((p = getlogin()) == NULL)
  61                 err(1, "getlogin failed");
  62         printf("%s\n", p);
  63         exit(0);
  64 }
  65
  66 static void
  67 usage(void)
  68 {
  69         fprintf(stderr, "usage: logname\n");
  70         exit(1);
  71 }