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/* $NetBSD: dirname.c,v 1.11 2009/11/24 13:34:20 tnozaki 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.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#ifndef HAVE_DIRNAME
#include <sys/cdefs.h>
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifndef PATH_MAX
# define PATH_MAX 1024
#endif
char *
dirname(char *path)
{
static char result[PATH_MAX];
const char *lastp;
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'))
goto singledot;
/* Strip trailing slashes, if any. */
lastp = path + strlen(path) - 1;
while (lastp != path && *lastp == '/')
lastp--;
/* Terminate path at the last occurence of '/'. */
do {
if (*lastp == '/') {
/* Strip trailing slashes, if any. */
while (lastp != path && *lastp == '/')
lastp--;
/* ...and copy the result into the result buffer. */
len = (lastp - path) + 1 /* last char */;
if (len > (PATH_MAX - 1))
len = PATH_MAX - 1;
memcpy(result, path, len);
result[len] = '\0';
return (result);
}
} while (--lastp >= path);
/* No /'s found, return a pointer to the string ".". */
singledot:
result[0] = '.';
result[1] = '\0';
return (result);
}
#endif
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