1 /* $NetBSD: logname.c,v 1.6 1994/12/22 06:39:32 jtc 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 #ifndef lint 37 static char copyright[] = 38 "@(#) 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 static char rcsid[] = "$NetBSD: logname.c,v 1.6 1994/12/22 06:39:32 jtc 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 void usage __P((void)); 56 57 int 58 main(argc, argv) 59 int argc; 60 char *argv[]; 61 { 62 int ch; 63 char *p; 64 65 setlocale(LC_ALL, ""); 66 67 while ((ch = getopt(argc, argv, "")) != EOF) 68 switch (ch) { 69 case '?': 70 default: 71 usage(); 72 /* NOTREACHED */ 73 } 74 75 if (argc != optind) { 76 usage(); 77 /* NOTREACHED */ 78 } 79 80 if ((p = getlogin()) == NULL) 81 err(1, NULL); 82 (void)printf("%s\n", p); 83 exit(0); 84 } 85 86 void 87 usage() 88 { 89 (void)fprintf(stderr, "usage: logname\n"); 90 exit(1); 91 } 92