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 00042 #include <errno.h> 00043 #include <libgen.h> 00044 #include <stdlib.h> 00045 #include <string.h> 00046 00047 #if !defined(MAXPATHLEN) 00048 #define MAXPATHLEN 256 00049 #endif 00050 00067 char *basename(CONST char *path) 00068 { 00069 static char *bname = NULL; 00070 CONST char *endp, *startp; 00071 00072 if (bname == NULL) { 00073 bname = (char *) malloc(MAXPATHLEN); 00074 if (bname == NULL) 00075 return (NULL); 00076 } 00077 00078 /* Empty or NULL string gets treated as "." */ 00079 if (path == NULL || *path == '\0') { 00080 strcpy(bname, "."); 00081 return (bname); 00082 } 00083 00084 /* Strip trailing slashes */ 00085 endp = path + strlen(path) - 1; 00086 while (endp > path && *endp == '/') 00087 endp--; 00088 00089 /* All slashes becomes "/" */ 00090 if (endp == path && *endp == '/') { 00091 strcpy(bname, "/"); 00092 return (bname); 00093 } 00094 00095 /* Find the start of the base */ 00096 startp = endp; 00097 while (startp > path && *(startp - 1) != '/') 00098 startp--; 00099 00100 if ((endp - startp) + 2 >= MAXPATHLEN) { 00101 errno = ENAMETOOLONG; 00102 return (NULL); 00103 } 00104 strcpy(bname, startp); 00105 bname[(endp - startp) + 1] = 0; 00106 00107 return (bname); 00108 }