101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
/* $NetBSD: dirname.c,v 1.13 2014/07/16 10:52:26 christos Exp $ */
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/*-
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* Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Klaus Klein and Jason R. Thorpe.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: dirname.c,v 1.13 2014/07/16 10:52:26 christos Exp $");
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#endif /* !LIBC_SCCS && !lint */
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#include "namespace.h"
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#include <sys/param.h>
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#include <libgen.h>
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#include <limits.h>
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#include <string.h>
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#ifdef __weak_alias
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__weak_alias(dirname,_dirname)
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#endif
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static size_t
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xdirname_r(const char *path, char *buf, size_t buflen)
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{
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const char *endp;
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size_t len;
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/*
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* If `path' is a null pointer or points to an empty string,
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* return a pointer to the string ".".
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*/
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if (path == NULL || *path == '\0') {
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path = ".";
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len = 1;
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goto out;
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}
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/* Strip trailing slashes, if any. */
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endp = path + strlen(path) - 1;
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while (endp != path && *endp == '/')
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endp--;
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/* Find the start of the dir */
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while (endp > path && *endp != '/')
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endp--;
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if (endp == path) {
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path = *endp == '/' ? "/" : ".";
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len = 1;
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goto out;
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}
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do
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endp--;
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while (endp > path && *endp == '/');
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len = endp - path + 1;
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out:
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if (buf != NULL && buflen != 0) {
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buflen = MIN(len, buflen - 1);
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memcpy(buf, path, buflen);
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buf[buflen] = '\0';
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}
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return len;
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}
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#if !HAVE_DIRNAME
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char *
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dirname(char *path)
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{
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static char result[PATH_MAX];
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(void)xdirname_r(path, result, sizeof(result));
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return result;
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}
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#endif
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