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/* $Id: avl_Range.cpp.h $ */
/** @file
* kAVLRange - Range routines 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 _kAVLRange_h_
#define _kAVLRange_h_
/**
* Finds the range containing the specified key.
*
* @returns Pointer to the matching range.
*
* @param ppTree Pointer to Pointer to the tree root node.
* @param Key The Key to find matching range for.
*/
KAVL_DECL(PKAVLNODECORE) KAVL_FN(RangeGet)(PPKAVLNODECORE ppTree, register KAVLKEY Key)
{
register PKAVLNODECORE pNode = KAVL_GET_POINTER_NULL(ppTree);
if (pNode)
{
for (;;)
{
if (KAVL_R_IS_IN_RANGE(pNode->Key, pNode->KeyLast, Key))
return pNode;
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 NULL;
}
/**
* Removes the range containing the specified key.
*
* @returns Pointer to the matching range.
*
* @param ppTree Pointer to Pointer to the tree root node.
* @param Key The Key to remove matching range for.
*/
RTDECL(PKAVLNODECORE) KAVL_FN(RangeRemove)(PPKAVLNODECORE ppTree, KAVLKEY Key)
{
PKAVLNODECORE pNode = KAVL_FN(RangeGet)(ppTree, Key);
if (pNode)
return KAVL_FN(Remove)(ppTree, pNode->Key);
return NULL;
}
#endif
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