| 1 | /* $Id: avl_Get.cpp.h 4071 2007-08-07 17:07:59Z vboxsync $ */
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| 2 | /** @file
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| 3 | * kAVLGet - get routine 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) 1999-2002 knut st. osmundsen (bird-src-spam@anduin.net)
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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 as published by the Free Software Foundation,
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| 13 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
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| 14 | * distribution. VirtualBox OSE is distributed in the hope that it will
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| 15 | * be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 | #ifndef _kAVLGet_h_
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| 19 | #define _kAVLGet_h_
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| 20 |
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| 21 |
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| 22 | /**
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| 23 | * Gets a node from the tree (does not remove it!)
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| 24 | * @returns Pointer to the node holding the given key.
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| 25 | * @param ppTree Pointer to the AVL-tree root node pointer.
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| 26 | * @param Key Key value of the node which is to be found.
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| 27 | * @author knut st. osmundsen
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| 28 | */
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| 29 | RTDECL(PKAVLNODECORE) KAVL_FN(Get)(PPKAVLNODECORE ppTree, KAVLKEY Key)
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| 30 | {
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| 31 | register PKAVLNODECORE pNode = KAVL_GET_POINTER_NULL(ppTree);
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| 32 |
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| 33 | if (pNode)
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| 34 | {
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| 35 | while (KAVL_NE(pNode->Key, Key))
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| 36 | {
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| 37 | if (KAVL_G(pNode->Key, Key))
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| 38 | {
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| 39 | if (pNode->pLeft != KAVL_NULL)
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| 40 | pNode = KAVL_GET_POINTER(&pNode->pLeft);
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| 41 | else
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| 42 | return NULL;
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| 43 | }
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| 44 | else
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| 45 | {
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| 46 | if (pNode->pRight != KAVL_NULL)
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| 47 | pNode = KAVL_GET_POINTER(&pNode->pRight);
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| 48 | else
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| 49 | return NULL;
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| 50 | }
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| 51 | }
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| 52 | }
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| 53 |
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| 54 | return pNode;
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| 55 | }
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| 56 |
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| 57 |
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| 58 | #endif
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