NetBSD/lib/libc/gen/dirname.c

79 lines
2.8 KiB
C

/* $NetBSD: dirname.c,v 1.1 1997/11/02 16:48:29 kleink Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Klaus Klein.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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 1.1 1997/11/02 16:48:29 kleink Exp $");
#endif /* !LIBC_SCCS && !lint */
#include "namespace.h"
#include <libgen.h>
#include <string.h>
#ifdef __weak_alias
__weak_alias(dirname,_dirname);
#endif
char *
dirname(path)
char *path;
{
static char singledot[] = ".";
char *p;
/*
* If `path' is a null pointer or points to an empty string, or does
* not contain a '/', return a pointer to the string ".".
*/
if ((path == NULL) || (*path == '\0') ||
(strchr(path, '/') == NULL))
return (singledot);
/* Strip trailing slashes, if any. */
p = path + strlen(path) - 1;
while (*p == '/' && p != path)
*p-- = '\0';
/* Terminate path at the last occurence of '/'. */
if ((p = strrchr(path, '/')) != NULL)
*(p + (p == path ? 1 : 0)) = '\0';
return (path);
}