diff options
Diffstat (limited to 'src/VBox/Runtime/common/table/avl_Get.cpp.h')
-rw-r--r-- | src/VBox/Runtime/common/table/avl_Get.cpp.h | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/table/avl_Get.cpp.h b/src/VBox/Runtime/common/table/avl_Get.cpp.h new file mode 100644 index 00000000..481df448 --- /dev/null +++ b/src/VBox/Runtime/common/table/avl_Get.cpp.h @@ -0,0 +1,67 @@ +/* $Id: avl_Get.cpp.h $ */ +/** @file + * kAVLGet - get routine 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 _kAVLGet_h_ +#define _kAVLGet_h_ + + +/** + * Gets a node from the tree (does not remove it!) + * @returns Pointer to the node holding the given key. + * @param ppTree Pointer to the AVL-tree root node pointer. + * @param Key Key value of the node which is to be found. + * @author knut st. osmundsen + */ +KAVL_DECL(PKAVLNODECORE) KAVL_FN(Get)(PPKAVLNODECORE ppTree, KAVLKEY Key) +{ + register PKAVLNODECORE pNode = KAVL_GET_POINTER_NULL(ppTree); + + if (pNode) + { + while (KAVL_NE(pNode->Key, Key)) + { + 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 pNode; +} + + +#endif |