1 /* $NetBSD: dirname.c,v 1.7 2002/10/17 11:36:39 tron Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 2002 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 and Jason R. Thorpe. 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 1.7 2002/10/17 11:36:39 tron Exp $"); 42 #endif /* !LIBC_SCCS && !lint */ 43 44 #include "namespace.h" 45 #include <libgen.h> 46 #include <limits.h> 47 #include <string.h> 48 49 #ifdef __weak_alias 50 __weak_alias(dirname,_dirname) 51 #endif 52 53 #if !HAVE_DIRNAME 54 char * 55 dirname(path) 56 char *path; 57 { 58 static char singledot[] = "."; 59 static char result[PATH_MAX]; 60 char *lastp; 61 size_t len; 62 63 /* 64 * If `path' is a null pointer or points to an empty string, 65 * return a pointer to the string ".". 66 */ 67 if ((path == NULL) || (*path == '\0')) 68 return (singledot); 69 70 /* Strip trailing slashes, if any. */ 71 lastp = path + strlen(path) - 1; 72 while (lastp != path && *lastp == '/') 73 lastp--; 74 75 /* Terminate path at the last occurence of '/'. */ 76 do { 77 if (*lastp == '/') { 78 /* Strip trailing slashes, if any. */ 79 while (lastp != path && *lastp == '/') 80 lastp--; 81 82 /* ...and copy the result into the result buffer. */ 83 len = (lastp - path) + 1 /* last char */; 84 if (len > (PATH_MAX - 1)) 85 len = PATH_MAX - 1; 86 87 memcpy(result, path, len); 88 result[len] = '\0'; 89 90 return (result); 91 } 92 } while (--lastp >= path); 93 94 /* No /'s found, return a pointer to the string ".". */ 95 return (singledot); 96 } 97 #endif 98