1 /* $NetBSD: logname.c,v 1.9 2008/07/21 14:19:23 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. 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 1.9 2008/07/21 14:19:23 lukem 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 } 89