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 00045 #include <errno.h> 00046 #include <libgen.h> 00047 #include <stdlib.h> 00048 #include <string.h> 00049 #include <memdebug.h> 00050 00051 #if !defined(MAXPATHLEN) 00052 #define MAXPATHLEN 256 00053 #endif 00054 00071 char *basename(CONST char *path) 00072 { 00073 static char *bname = NULL; 00074 CONST char *endp, *startp; 00075 00076 if (bname == NULL) { 00077 bname = (char *) malloc(MAXPATHLEN); 00078 if (bname == NULL) 00079 return (NULL); 00080 } 00081 00082 /* Empty or NULL string gets treated as "." */ 00083 if (path == NULL || *path == '\0') { 00084 strcpy(bname, "."); 00085 return (bname); 00086 } 00087 00088 /* Strip trailing slashes */ 00089 endp = path + strlen(path) - 1; 00090 while (endp > path && *endp == '/') 00091 endp--; 00092 00093 /* All slashes becomes "/" */ 00094 if (endp == path && *endp == '/') { 00095 strcpy(bname, "/"); 00096 return (bname); 00097 } 00098 00099 /* Find the start of the base */ 00100 startp = endp; 00101 while (startp > path && *(startp - 1) != '/') 00102 startp--; 00103 00104 if ((endp - startp) + 2 >= MAXPATHLEN) { 00105 errno = ENAMETOOLONG; 00106 return (NULL); 00107 } 00108 strcpy(bname, startp); 00109 bname[(endp - startp) + 1] = 0; 00110 00111 return (bname); 00112 }