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 28#if 0 29#ifndef lint 30static char rcsid[] = "$OpenBSD: basename.c,v 1.4 1999/05/30 17:10:30 espie Exp $"; 31#endif /* not lint */ 32#endif 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: src/lib/libc/gen/basename.c,v 1.7 2002/12/30 01:41:14 marcel Exp $"); 35 36#include <errno.h> 37#include <libgen.h> 38#include <stdlib.h> 39#include <string.h> 40#include <sys/param.h> 41 42#if __DARWIN_UNIX03 43#define const /**/ 44#endif 45 46char * 47basename(path) 48 const char *path; 49{ 50 static char *bname = NULL; 51 const char *endp, *startp; 52 53 if (bname == NULL) { 54 bname = (char *)malloc(MAXPATHLEN); 55 if (bname == NULL) 56 return(NULL); 57 } 58 59 /* Empty or NULL string gets treated as "." */ 60 if (path == NULL || *path == '\0') { 61 (void)strcpy(bname, "."); 62 return(bname); 63 } 64 65 /* Strip trailing slashes */ 66 endp = path + strlen(path) - 1; 67 while (endp > path && *endp == '/') 68 endp--; 69 70 /* All slashes becomes "/" */ 71 if (endp == path && *endp == '/') { 72 (void)strcpy(bname, "/"); 73 return(bname); 74 } 75 76 /* Find the start of the base */ 77 startp = endp; 78 while (startp > path && *(startp - 1) != '/') 79 startp--; 80 81 if (endp - startp + 2 > MAXPATHLEN) { 82 errno = ENAMETOOLONG; 83 return(NULL); 84 } 85 (void)strncpy(bname, startp, endp - startp + 1); 86 bname[endp - startp + 1] = '\0'; 87 return(bname); 88} 89