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/* $Id: avl_DoWithAll.cpp.h 155244 2023-01-17 14:15:46Z bird $ */
/** @file
* kAVLDoWithAll - Do with all nodes routine for AVL trees.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#ifndef _kAVLDoWithAll_h_
#define _kAVLDoWithAll_h_
/**
* Iterates thru all nodes in the given tree.
* @returns 0 on success. Return from callback on failure.
* @param ppTree Pointer to the AVL-tree root node pointer.
* @param fFromLeft TRUE: Left to right.
* FALSE: Right to left.
* @param pfnCallBack Pointer to callback function.
* @param pvParam Userparameter passed on to the callback function.
*/
KAVL_DECL(int) KAVL_FN(DoWithAll)(PPKAVLNODECORE ppTree, int fFromLeft, PKAVLCALLBACK pfnCallBack, void * pvParam)
{
KAVLSTACK2 AVLStack;
PKAVLNODECORE pNode;
#ifdef KAVL_EQUAL_ALLOWED
PKAVLNODECORE pEqual;
#endif
int rc;
if (*ppTree == KAVL_NULL)
return VINF_SUCCESS;
AVLStack.cEntries = 1;
AVLStack.achFlags[0] = 0;
AVLStack.aEntries[0] = KAVL_GET_POINTER(ppTree);
if (fFromLeft)
{ /* from left */
while (AVLStack.cEntries > 0)
{
pNode = AVLStack.aEntries[AVLStack.cEntries - 1];
/* left */
if (!AVLStack.achFlags[AVLStack.cEntries - 1]++)
{
if (pNode->pLeft != KAVL_NULL)
{
AVLStack.achFlags[AVLStack.cEntries] = 0; /* 0 first, 1 last */
AVLStack.aEntries[AVLStack.cEntries++] = KAVL_GET_POINTER(&pNode->pLeft);
continue;
}
}
/* center */
Assert(pNode->uchHeight == RT_MAX(AVL_HEIGHTOF(KAVL_GET_POINTER_NULL(&pNode->pLeft)),
AVL_HEIGHTOF(KAVL_GET_POINTER_NULL(&pNode->pRight))) + 1);
rc = pfnCallBack(pNode, pvParam);
if (rc != VINF_SUCCESS)
return rc;
#ifdef KAVL_EQUAL_ALLOWED
if (pNode->pList != KAVL_NULL)
for (pEqual = KAVL_GET_POINTER(&pNode->pList); pEqual; pEqual = KAVL_GET_POINTER_NULL(&pEqual->pList))
{
rc = pfnCallBack(pEqual, pvParam);
if (rc != VINF_SUCCESS)
return rc;
}
#endif
/* right */
AVLStack.cEntries--;
if (pNode->pRight != KAVL_NULL)
{
AVLStack.achFlags[AVLStack.cEntries] = 0;
AVLStack.aEntries[AVLStack.cEntries++] = KAVL_GET_POINTER(&pNode->pRight);
}
} /* while */
}
else
{ /* from right */
while (AVLStack.cEntries > 0)
{
pNode = AVLStack.aEntries[AVLStack.cEntries - 1];
/* right */
if (!AVLStack.achFlags[AVLStack.cEntries - 1]++)
{
if (pNode->pRight != KAVL_NULL)
{
AVLStack.achFlags[AVLStack.cEntries] = 0; /* 0 first, 1 last */
AVLStack.aEntries[AVLStack.cEntries++] = KAVL_GET_POINTER(&pNode->pRight);
continue;
}
}
/* center */
Assert(pNode->uchHeight == RT_MAX(AVL_HEIGHTOF(KAVL_GET_POINTER_NULL(&pNode->pLeft)),
AVL_HEIGHTOF(KAVL_GET_POINTER_NULL(&pNode->pRight))) + 1);
rc = pfnCallBack(pNode, pvParam);
if (rc != VINF_SUCCESS)
return rc;
#ifdef KAVL_EQUAL_ALLOWED
if (pNode->pList != KAVL_NULL)
for (pEqual = KAVL_GET_POINTER(&pNode->pList); pEqual; pEqual = KAVL_GET_POINTER_NULL(&pEqual->pList))
{
rc = pfnCallBack(pEqual, pvParam);
if (rc != VINF_SUCCESS)
return rc;
}
#endif
/* left */
AVLStack.cEntries--;
if (pNode->pLeft != KAVL_NULL)
{
AVLStack.achFlags[AVLStack.cEntries] = 0;
AVLStack.aEntries[AVLStack.cEntries++] = KAVL_GET_POINTER(&pNode->pLeft);
}
} /* while */
}
return VINF_SUCCESS;
}
#endif
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