1 /* $NetBSD: dirname.c,v 1.1 1997/11/02 16:48:29 kleink Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Klaus Klein. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 __RCSID("$NetBSD: dirname.c,v 1.1 1997/11/02 16:48:29 kleink Exp $"); 42 #endif /* !LIBC_SCCS && !lint */ 43 44 #include "namespace.h" 45 #include <libgen.h> 46 #include <string.h> 47 48 #ifdef __weak_alias 49 __weak_alias(dirname,_dirname); 50 #endif 51 52 53 char * 54 dirname(path) 55 char *path; 56 { 57 static char singledot[] = "."; 58 char *p; 59 60 /* 61 * If `path' is a null pointer or points to an empty string, or does 62 * not contain a '/', return a pointer to the string ".". 63 */ 64 if ((path == NULL) || (*path == '\0') || 65 (strchr(path, '/') == NULL)) 66 return (singledot); 67 68 /* Strip trailing slashes, if any. */ 69 p = path + strlen(path) - 1; 70 while (*p == '/' && p != path) 71 *p-- = '\0'; 72 73 /* Terminate path at the last occurence of '/'. */ 74 if ((p = strrchr(path, '/')) != NULL) 75 *(p + (p == path ? 1 : 0)) = '\0'; 76 77 return (path); 78 } 79