/* $NetBSD: dirname.c,v 1.14 2018/09/27 00:45:34 kre Exp $ */ /*- * Copyright (c) 1997, 2002 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Klaus Klein and Jason R. Thorpe. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include <sys/cdefs.h> #if defined(LIBC_SCCS) && !defined(lint) __RCSID("$NetBSD: dirname.c,v 1.14 2018/09/27 00:45:34 kre Exp $"); #endif /* !LIBC_SCCS && !lint */ #include "namespace.h" #include <sys/param.h> #include <libgen.h> #include <limits.h> #include <string.h> #ifdef __weak_alias __weak_alias(dirname,_dirname) #endif static size_t xdirname_r(const char *path, char *buf, size_t buflen) { const char *endp; size_t len; /* * If `path' is a null pointer or points to an empty string, * return a pointer to the string ".". */ if (path == NULL || *path == '\0') { path = "."; len = 1; goto out; } /* Strip trailing slashes, if any. */ endp = path + strlen(path) - 1; while (endp != path && *endp == '/') endp--; /* Find the start of the dir */ while (endp > path && *endp != '/') endp--; if (endp == path) { path = *endp == '/' ? "/" : "."; len = 1; goto out; } do endp--; while (endp > path && *endp == '/'); len = endp - path + 1; out: if (buf != NULL && buflen != 0) { buflen = MIN(len, buflen - 1); if (buf != path) memcpy(buf, path, buflen); buf[buflen] = '\0'; } return len; } #if !HAVE_DIRNAME char * dirname(char *path) { static char result[PATH_MAX]; (void)xdirname_r(path, result, sizeof(result)); return result; } #endif |