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/* $Id: avl_Get.cpp.h $ */
/** @file
* kAVLGet - get routine for AVL trees.
*/
/*
* Copyright (C) 2006-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
#ifndef _kAVLGet_h_
#define _kAVLGet_h_
/**
* Gets a node from the tree (does not remove it!)
* @returns Pointer to the node holding the given key.
* @param ppTree Pointer to the AVL-tree root node pointer.
* @param Key Key value of the node which is to be found.
* @author knut st. osmundsen
*/
KAVL_DECL(PKAVLNODECORE) KAVL_FN(Get)(PPKAVLNODECORE ppTree, KAVLKEY Key)
{
register PKAVLNODECORE pNode = KAVL_GET_POINTER_NULL(ppTree);
if (pNode)
{
while (KAVL_NE(pNode->Key, Key))
{
if (KAVL_G(pNode->Key, Key))
{
if (pNode->pLeft != KAVL_NULL)
pNode = KAVL_GET_POINTER(&pNode->pLeft);
else
return NULL;
}
else
{
if (pNode->pRight != KAVL_NULL)
pNode = KAVL_GET_POINTER(&pNode->pRight);
else
return NULL;
}
}
}
return pNode;
}
#endif
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