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 1.1.2.2 2001/07/23 10:13:04 dd Exp $ 29 * $DragonFly: src/lib/libc/gen/basename.c,v 1.3 2004/06/06 15:05:55 hmp Exp $ 30 */ 31 32 #include <errno.h> 33 #include <libgen.h> 34 #include <string.h> 35 #include <sys/param.h> 36 37 char * 38 basename(path) 39 const char *path; 40 { 41 static char bname[MAXPATHLEN]; 42 const char *endp, *startp; 43 44 /* Empty or NULL string gets treated as "." */ 45 if (path == NULL || *path == '\0') { 46 (void)strcpy(bname, "."); 47 return(bname); 48 } 49 50 /* Strip trailing slashes */ 51 endp = path + strlen(path) - 1; 52 while (endp > path && *endp == '/') 53 endp--; 54 55 /* All slashes becomes "/" */ 56 if (endp == path && *endp == '/') { 57 (void)strcpy(bname, "/"); 58 return(bname); 59 } 60 61 /* Find the start of the base */ 62 startp = endp; 63 while (startp > path && *(startp - 1) != '/') 64 startp--; 65 66 if (endp - startp + 2 > sizeof(bname)) { 67 errno = ENAMETOOLONG; 68 return(NULL); 69 } 70 (void)strncpy(bname, startp, endp - startp + 1); 71 bname[endp - startp + 1] = '\0'; 72 return(bname); 73 } 74