1/* $NetBSD: basename.c,v 1.12 2023/01/18 08:07:22 simonb 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 1.12 2023/01/18 08:07:22 simonb 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 48static size_t 49xbasename_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 */; 82out: 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 93char * 94basename(char *path) 95{ 96 static char result[PATH_MAX]; 97 98 (void)xbasename_r(path, result, sizeof(result)); 99 return result; 100} 101 102#endif 103