1 /* 2 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 17 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 18 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 19 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * $OpenBSD: basename.c,v 1.4 1999/05/30 17:10:30 espie Exp $ 28 * $FreeBSD: src/lib/libc/gen/basename.c,v 1.6 2002/12/21 07:12:35 bbraun Exp $ 29 * $DragonFly: src/lib/libc/gen/basename.c,v 1.8 2005/09/18 16:09:45 asmodai Exp $ 30 */ 31 32 #include <errno.h> 33 #include <libgen.h> 34 #include <stdlib.h> 35 #include <string.h> 36 #include <sys/param.h> 37 38 char * 39 basename(const char *path) 40 { 41 static char *bname = NULL; 42 const char *endp, *startp; 43 44 if (bname == NULL) { 45 bname = (char *)malloc(MAXPATHLEN); 46 if (bname == NULL) 47 return(NULL); 48 } 49 50 /* Empty or NULL string gets treated as "." */ 51 if (path == NULL || *path == '\0') { 52 strlcpy(bname, ".", MAXPATHLEN); 53 return(bname); 54 } 55 56 /* Strip trailing slashes */ 57 endp = path + strlen(path) - 1; 58 while (endp > path && *endp == '/') 59 endp--; 60 61 /* All slashes becomes "/" */ 62 if (endp == path && *endp == '/') { 63 strlcpy(bname, "/", MAXPATHLEN); 64 return(bname); 65 } 66 67 /* Find the start of the base */ 68 startp = endp; 69 while (startp > path && *(startp - 1) != '/') 70 startp--; 71 72 if (strlcpy(bname, startp, (endp - startp) + 2) >= MAXPATHLEN) { 73 errno = ENAMETOOLONG; 74 return(NULL); 75 } 76 return(bname); 77 } 78