| 1 | /* $Id: avl_Range.cpp.h 5999 2007-12-07 15:05:06Z vboxsync $ */
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| 2 | /** @file
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| 3 | * kAVLRange - Range routines for AVL trees.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 1999-2006 knut st. osmundsen ([email protected])
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 | #ifndef _kAVLRange_h_
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| 28 | #define _kAVLRange_h_
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| 29 |
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| 30 | /**
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| 31 | * Finds the range containing the specified key.
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| 32 | *
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| 33 | * @returns Pointer to the matching range.
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| 34 | *
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| 35 | * @param ppTree Pointer to Pointer to the tree root node.
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| 36 | * @param Key The Key to find matching range for.
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| 37 | */
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| 38 | RTDECL(PKAVLNODECORE) KAVL_FN(RangeGet)(PPKAVLNODECORE ppTree, register KAVLKEY Key)
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| 39 | {
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| 40 | register PKAVLNODECORE pNode = KAVL_GET_POINTER_NULL(ppTree);
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| 41 | if (pNode)
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| 42 | {
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| 43 | for (;;)
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| 44 | {
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| 45 | if (KAVL_R_IS_IN_RANGE(pNode->Key, pNode->KeyLast, Key))
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| 46 | return pNode;
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| 47 | if (KAVL_G(pNode->Key, Key))
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| 48 | {
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| 49 | if (pNode->pLeft != KAVL_NULL)
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| 50 | pNode = KAVL_GET_POINTER(&pNode->pLeft);
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| 51 | else
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| 52 | return NULL;
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| 53 | }
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| 54 | else
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| 55 | {
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| 56 | if (pNode->pRight != KAVL_NULL)
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| 57 | pNode = KAVL_GET_POINTER(&pNode->pRight);
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| 58 | else
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| 59 | return NULL;
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| 60 | }
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| 61 | }
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| 62 | }
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| 63 |
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| 64 | return NULL;
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| 65 | }
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| 66 |
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| 67 |
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| 68 | /**
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| 69 | * Removes the range containing the specified key.
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| 70 | *
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| 71 | * @returns Pointer to the matching range.
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| 72 | *
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| 73 | * @param ppTree Pointer to Pointer to the tree root node.
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| 74 | * @param Key The Key to remove matching range for.
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| 75 | */
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| 76 | RTDECL(PKAVLNODECORE) KAVL_FN(RangeRemove)(PPKAVLNODECORE ppTree, KAVLKEY Key)
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| 77 | {
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| 78 | PKAVLNODECORE pNode = KAVL_FN(RangeGet)(ppTree, Key);
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| 79 | if (pNode)
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| 80 | return KAVL_FN(Remove)(ppTree, pNode->Key);
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| 81 | return NULL;
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| 82 | }
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| 83 |
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| 84 | #endif
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