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 } 72