1 /* $NetBSD: dirname.c,v 1.13 2014/07/16 10:52:26 christos 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 #include <sys/param.h> 39 #ifdef HAVE_LIBGEN_H 40 #include <libgen.h> 41 #endif 42 #ifdef HAVE_LIMITS_H 43 #include <limits.h> 44 #endif 45 #ifdef HAVE_STRING_H 46 #include <string.h> 47 #endif 48 #ifndef PATH_MAX 49 # define PATH_MAX 1024 50 #endif 51 #ifndef MIN 52 # define MIN(a, b) ((a < b) ? a : b) 53 #endif 54 55 56 static size_t 57 xdirname_r(const char *path, char *buf, size_t buflen) 58 { 59 const char *endp; 60 size_t len; 61 62 /* 63 * If `path' is a null pointer or points to an empty string, 64 * return a pointer to the string ".". 65 */ 66 if (path == NULL || *path == '\0') { 67 path = "."; 68 len = 1; 69 goto out; 70 } 71 72 /* Strip trailing slashes, if any. */ 73 endp = path + strlen(path) - 1; 74 while (endp != path && *endp == '/') 75 endp--; 76 77 /* Find the start of the dir */ 78 while (endp > path && *endp != '/') 79 endp--; 80 81 if (endp == path) { 82 path = *endp == '/' ? "/" : "."; 83 len = 1; 84 goto out; 85 } 86 87 do 88 endp--; 89 while (endp > path && *endp == '/'); 90 91 len = endp - path + 1; 92 out: 93 if (buf != NULL && buflen != 0) { 94 buflen = MIN(len, buflen - 1); 95 memcpy(buf, path, buflen); 96 buf[buflen] = '\0'; 97 } 98 return len; 99 } 100 101 char * 102 dirname(char *path) 103 { 104 static char result[PATH_MAX]; 105 (void)xdirname_r(path, result, sizeof(result)); 106 return result; 107 } 108 109 #ifdef MAIN 110 #include <stdlib.h> 111 #include <stdio.h> 112 113 int 114 main(int argc, char *argv[]) 115 { 116 printf("%s\n", dirname(argv[1])); 117 exit(0); 118 } 119 #endif 120 #endif 121