00001 /* 00002 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions 00007 * are met: 00008 * 1. Redistributions of source code must retain the above copyright 00009 * notice, this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright 00011 * notice, this list of conditions and the following disclaimer in the 00012 * documentation and/or other materials provided with the distribution. 00013 * 3. The name of the author may not be used to endorse or promote products 00014 * derived from this software without specific prior written permission. 00015 * 00016 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 00017 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 00018 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 00019 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00020 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 00021 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 00022 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 00023 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 00024 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 00025 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00026 */ 00027 00028 #include <errno.h> 00029 #include <libgen.h> 00030 #include <stdlib.h> 00031 #include <string.h> 00032 00033 #if !defined(MAXPATHLEN) 00034 #define MAXPATHLEN 256 00035 #endif 00036 00066 char *dirname(CONST char *path) 00067 { 00068 static char *bname; 00069 CONST char *endp; 00070 00071 if (bname == NULL) { 00072 bname = (char *) malloc(MAXPATHLEN); 00073 if (bname == NULL) 00074 return (NULL); 00075 } 00076 00077 /* Empty or NULL string gets treated as "." */ 00078 if (path == NULL || *path == '\0') { 00079 strncpy(bname, ".", MAXPATHLEN); 00080 return (bname); 00081 } 00082 00083 /* Strip trailing slashes */ 00084 endp = path + strlen(path) - 1; 00085 while (endp > path && *endp == '/') 00086 endp--; 00087 00088 /* Find the start of the dir */ 00089 while (endp > path && *endp != '/') 00090 endp--; 00091 00092 /* Either the dir is "/" or there are no slashes */ 00093 if (endp == path) { 00094 strncpy(bname, *endp == '/' ? "/" : ".", MAXPATHLEN); 00095 return (bname); 00096 } 00097 00098 do { 00099 endp--; 00100 } while (endp > path && *endp == '/'); 00101 00102 if (endp - path + 2 > MAXPATHLEN) { 00103 errno = ENAMETOOLONG; 00104 return (NULL); 00105 } 00106 strcpy(bname, path); 00107 bname[(endp - path) + 1] = 0; 00108 00109 return (bname); 00110 }