| 1 | /* $Id: avl_DoWithAll.cpp.h 44528 2013-02-04 14:27:54Z vboxsync $ */
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| 2 | /** @file
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| 3 | * kAVLDoWithAll - Do with all nodes 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) 1999-2011 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 (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 _kAVLDoWithAll_h_
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| 28 | #define _kAVLDoWithAll_h_
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| 29 |
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| 30 |
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| 31 | /**
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| 32 | * Iterates thru all nodes in the given tree.
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| 33 | * @returns 0 on success. Return from callback on failure.
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| 34 | * @param ppTree Pointer to the AVL-tree root node pointer.
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| 35 | * @param fFromLeft TRUE: Left to right.
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| 36 | * FALSE: Right to left.
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| 37 | * @param pfnCallBack Pointer to callback function.
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| 38 | * @param pvParam Userparameter passed on to the callback function.
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| 39 | */
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| 40 | KAVL_DECL(int) KAVL_FN(DoWithAll)(PPKAVLNODECORE ppTree, int fFromLeft, PKAVLCALLBACK pfnCallBack, void * pvParam)
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| 41 | {
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| 42 | KAVLSTACK2 AVLStack;
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| 43 | PKAVLNODECORE pNode;
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| 44 | #ifdef KAVL_EQUAL_ALLOWED
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| 45 | PKAVLNODECORE pEqual;
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| 46 | #endif
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| 47 | int rc;
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| 48 |
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| 49 | if (*ppTree == KAVL_NULL)
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| 50 | return 0;
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| 51 |
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| 52 | AVLStack.cEntries = 1;
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| 53 | AVLStack.achFlags[0] = 0;
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| 54 | AVLStack.aEntries[0] = KAVL_GET_POINTER(ppTree);
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| 55 |
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| 56 | if (fFromLeft)
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| 57 | { /* from left */
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| 58 | while (AVLStack.cEntries > 0)
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| 59 | {
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| 60 | pNode = AVLStack.aEntries[AVLStack.cEntries - 1];
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| 61 |
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| 62 | /* left */
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| 63 | if (!AVLStack.achFlags[AVLStack.cEntries - 1]++)
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| 64 | {
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| 65 | if (pNode->pLeft != KAVL_NULL)
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| 66 | {
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| 67 | AVLStack.achFlags[AVLStack.cEntries] = 0; /* 0 first, 1 last */
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| 68 | AVLStack.aEntries[AVLStack.cEntries++] = KAVL_GET_POINTER(&pNode->pLeft);
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| 69 | continue;
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| 70 | }
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| 71 | }
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| 72 |
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| 73 | /* center */
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| 74 | rc = pfnCallBack(pNode, pvParam);
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| 75 | if (rc)
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| 76 | return rc;
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| 77 | #ifdef KAVL_EQUAL_ALLOWED
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| 78 | if (pNode->pList != KAVL_NULL)
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| 79 | for (pEqual = KAVL_GET_POINTER(&pNode->pList); pEqual; pEqual = KAVL_GET_POINTER_NULL(&pEqual->pList))
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| 80 | {
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| 81 | rc = pfnCallBack(pEqual, pvParam);
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| 82 | if (rc)
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| 83 | return rc;
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| 84 | }
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| 85 | #endif
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| 86 |
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| 87 | /* right */
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| 88 | AVLStack.cEntries--;
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| 89 | if (pNode->pRight != KAVL_NULL)
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| 90 | {
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| 91 | AVLStack.achFlags[AVLStack.cEntries] = 0;
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| 92 | AVLStack.aEntries[AVLStack.cEntries++] = KAVL_GET_POINTER(&pNode->pRight);
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| 93 | }
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| 94 | } /* while */
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| 95 | }
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| 96 | else
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| 97 | { /* from right */
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| 98 | while (AVLStack.cEntries > 0)
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| 99 | {
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| 100 | pNode = AVLStack.aEntries[AVLStack.cEntries - 1];
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| 101 |
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| 102 | /* right */
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| 103 | if (!AVLStack.achFlags[AVLStack.cEntries - 1]++)
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| 104 | {
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| 105 | if (pNode->pRight != KAVL_NULL)
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| 106 | {
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| 107 | AVLStack.achFlags[AVLStack.cEntries] = 0; /* 0 first, 1 last */
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| 108 | AVLStack.aEntries[AVLStack.cEntries++] = KAVL_GET_POINTER(&pNode->pRight);
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| 109 | continue;
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| 110 | }
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| 111 | }
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| 112 |
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| 113 | /* center */
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| 114 | rc = pfnCallBack(pNode, pvParam);
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| 115 | if (rc)
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| 116 | return rc;
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| 117 | #ifdef KAVL_EQUAL_ALLOWED
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| 118 | if (pNode->pList != KAVL_NULL)
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| 119 | for (pEqual = KAVL_GET_POINTER(&pNode->pList); pEqual; pEqual = KAVL_GET_POINTER_NULL(&pEqual->pList))
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| 120 | {
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| 121 | rc = pfnCallBack(pEqual, pvParam);
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| 122 | if (rc)
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| 123 | return rc;
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| 124 | }
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| 125 | #endif
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| 126 |
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| 127 | /* left */
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| 128 | AVLStack.cEntries--;
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| 129 | if (pNode->pLeft != KAVL_NULL)
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| 130 | {
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| 131 | AVLStack.achFlags[AVLStack.cEntries] = 0;
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| 132 | AVLStack.aEntries[AVLStack.cEntries++] = KAVL_GET_POINTER(&pNode->pLeft);
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| 133 | }
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| 134 | } /* while */
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| 135 | }
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| 136 |
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| 137 | return 0;
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| 138 | }
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| 139 |
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| 140 |
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| 141 | #endif
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| 142 |
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