1 /* $NetBSD: basename.c,v 1.11 2014/07/16 10:52:26 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Klaus Klein and Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 __RCSID("$NetBSD: basename.c,v 1.11 2014/07/16 10:52:26 christos Exp $"); 35 #endif /* !LIBC_SCCS && !lint */ 36 37 #include "namespace.h" 38 #include <sys/param.h> 39 #include <libgen.h> 40 #include <string.h> 41 #include <limits.h> 42 #include <string.h> 43 44 #ifdef __weak_alias 45 __weak_alias(basename,_basename) 46 #endif 47 48 static size_t 49 xbasename_r(const char *path, char *buf, size_t buflen) 50 { 51 const char *startp, *endp; 52 size_t len; 53 54 /* 55 * If `path' is a null pointer or points to an empty string, 56 * return a pointer to the string ".". 57 */ 58 if (path == NULL || *path == '\0') { 59 startp = "."; 60 len = 1; 61 goto out; 62 } 63 64 /* Strip trailing slashes, if any. */ 65 endp = path + strlen(path) - 1; 66 while (endp != path && *endp == '/') 67 endp--; 68 69 /* Only slashes -> "/" */ 70 if (endp == path && *endp == '/') { 71 startp = "/"; 72 len = 1; 73 goto out; 74 } 75 76 /* Now find the beginning of this (final) component. */ 77 for (startp = endp; startp > path && *(startp - 1) != '/'; startp--) 78 continue; 79 80 /* ...and copy the result into the result buffer. */ 81 len = (endp - startp) + 1 /* last char */; 82 out: 83 if (buf != NULL && buflen != 0) { 84 buflen = MIN(len, buflen - 1); 85 memcpy(buf, startp, buflen); 86 buf[buflen] = '\0'; 87 } 88 return len; 89 } 90 91 #if !HAVE_BASENAME 92 93 char * 94 basename(char *path) { 95 static char result[PATH_MAX]; 96 97 (void)xbasename_r(path, result, sizeof(result)); 98 return result; 99 } 100 101 #endif 102