| 1 | /* $Id: kAvlGetWithParent.h 34 2009-11-08 19:38:40Z bird $ */
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| 2 | /** @file
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| 3 | * kAvlTmpl - Templated AVL Trees, Get Node With Parent.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (c) 1999-2009 Knut St. Osmundsen <bird-kStuff-spamix@anduin.net>
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| 8 | *
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| 9 | * Permission is hereby granted, free of charge, to any person
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| 10 | * obtaining a copy of this software and associated documentation
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| 11 | * files (the "Software"), to deal in the Software without
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| 12 | * restriction, including without limitation the rights to use,
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| 13 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 14 | * copies of the Software, and to permit persons to whom the
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| 15 | * Software is furnished to do so, subject to the following
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| 16 | * conditions:
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| 17 | *
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| 18 | * The above copyright notice and this permission notice shall be
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| 19 | * included in all copies or substantial portions of the Software.
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| 20 | *
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| 21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 22 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 23 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 24 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 25 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 26 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 27 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 28 | * OTHER DEALINGS IN THE SOFTWARE.
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| 29 | */
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| 30 |
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| 31 | /**
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| 32 | * Gets a node from the tree and its parent node (if any).
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| 33 | * The tree remains unchanged.
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| 34 | *
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| 35 | * @returns Pointer to the node holding the given key.
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| 36 | * @param pRoot Pointer to the AVL-tree root structure.
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| 37 | * @param ppParent Pointer to a variable which will hold the pointer to the partent node on
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| 38 | * return. When no node is found, this will hold the last searched node.
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| 39 | * @param Key Key value of the node which is to be found.
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| 40 | */
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| 41 | KAVL_DECL(KAVLNODE *) KAVL_FN(GetWithParent)(KAVLROOT *pRoot, KAVLNODE **ppParent, KAVLKEY Key)
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| 42 | {
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| 43 | register KAVLNODE *pNode;
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| 44 | register KAVLNODE *pParent;
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| 45 |
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| 46 | KAVL_READ_LOCK(pRoot);
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| 47 |
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| 48 | pParent = NULL;
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| 49 | pNode = KAVL_GET_POINTER_NULL(&pRoot->mpRoot);
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| 50 | while ( pNode != NULL
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| 51 | && KAVL_NE(pNode->mKey, Key))
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| 52 | {
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| 53 | pParent = pNode;
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| 54 | if (KAVL_G(pNode->mKey, Key))
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| 55 | pNode = KAVL_GET_POINTER_NULL(&pNode->mpLeft);
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| 56 | else
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| 57 | pNode = KAVL_GET_POINTER_NULL(&pNode->mpRight);
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| 58 | }
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| 59 |
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| 60 | KAVL_READ_UNLOCK(pRoot);
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| 61 |
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| 62 | *ppParent = pParent;
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| 63 | return pNode;
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| 64 | }
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| 65 |
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