1 /* $NetBSD: dirname.c,v 1.11 2009/11/24 13:34:20 tnozaki 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifdef HAVE_CONFIG_H 33 # include <config.h> 34 #endif 35 #ifndef HAVE_DIRNAME 36 37 #include <sys/cdefs.h> 38 39 #ifdef HAVE_LIMITS_H 40 #include <limits.h> 41 #endif 42 #ifdef HAVE_STRING_H 43 #include <string.h> 44 #endif 45 #ifndef PATH_MAX 46 # define PATH_MAX 1024 47 #endif 48 49 char * 50 dirname(char *path) 51 { 52 static char result[PATH_MAX]; 53 const char *lastp; 54 size_t len; 55 56 /* 57 * If `path' is a null pointer or points to an empty string, 58 * return a pointer to the string ".". 59 */ 60 if ((path == NULL) || (*path == '\0')) 61 goto singledot; 62 63 64 /* Strip trailing slashes, if any. */ 65 lastp = path + strlen(path) - 1; 66 while (lastp != path && *lastp == '/') 67 lastp--; 68 69 /* Terminate path at the last occurence of '/'. */ 70 do { 71 if (*lastp == '/') { 72 /* Strip trailing slashes, if any. */ 73 while (lastp != path && *lastp == '/') 74 lastp--; 75 76 /* ...and copy the result into the result buffer. */ 77 len = (lastp - path) + 1 /* last char */; 78 if (len > (PATH_MAX - 1)) 79 len = PATH_MAX - 1; 80 81 memcpy(result, path, len); 82 result[len] = '\0'; 83 84 return (result); 85 } 86 } while (--lastp >= path); 87 88 /* No /'s found, return a pointer to the string ".". */ 89 singledot: 90 result[0] = '.'; 91 result[1] = '\0'; 92 93 return (result); 94 } 95 #endif 96