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/* $NetBSD: dirname.c,v 1.1.1.2 2020/05/24 05:35:52 nia 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>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: dirname.c,v 1.1.1.2 2020/05/24 05:35:52 nia Exp $");
#endif /* !LIBC_SCCS && !lint */
#include "namespace.h"
#include <sys/param.h>
#ifdef HAVE_LIBGEN_H
#include <libgen.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifndef PATH_MAX
# define PATH_MAX 1024
#endif
#ifndef MIN
# define MIN(a, b) ((a < b) ? a : b)
#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;
}
char *
dirname(char *path)
{
static char result[PATH_MAX];
(void)xdirname_r(path, result, sizeof(result));
return result;
}
#ifdef MAIN
#include <stdlib.h>
#include <stdio.h>
int
main(int argc, char *argv[])
{
printf("%s\n", dirname(argv[1]));
exit(0);
}
#endif
#endif
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