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| 2416 | mencl | 1 | /* |
| 2 | * Copyright (C) 2006 Vojtech Mencl |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | /** @addtogroup genericadt |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 35 | |||
| 36 | #ifndef KERN_AVLTREE_H_ |
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| 37 | #define KERN_AVLTREE_H_ |
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| 38 | |||
| 39 | #include <arch/types.h> |
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| 40 | |||
| 41 | /* |
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| 42 | * Makro for getting pointer to structure which enclosure avltree structure. |
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| 43 | * |
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| 44 | * @param link Pointer to avltree structure. |
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| 45 | * @param type Name of outer structure. |
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| 46 | * @param member Name of avltree atribute in outer structure. |
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| 47 | */ |
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| 48 | #define avltree_get_instance(link,type,member) \ |
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| 49 | ((type *)(((uint8_t *)(link)) - ((uint8_t *)&(((type *)NULL)->member)))) |
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| 50 | |||
| 51 | |||
| 52 | typedef struct avltree_node avltree_node_t; |
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| 53 | typedef struct avltree avltree_t; |
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| 54 | |||
| 55 | |||
| 56 | /** AVL tree node structure. */ |
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| 57 | struct avltree_node |
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| 58 | { |
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| 59 | /** |
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| 60 | * Pointer to left descendand of this node. |
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| 61 | * |
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| 62 | * All keys of nodes in the left subtree are less then key of this node. |
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| 63 | */ |
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| 64 | struct avltree_node *lft; |
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| 65 | |||
| 66 | /** |
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| 67 | * Pointer to right descendand of this node. |
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| 68 | * |
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| 69 | * All keys of nodes in the right subtree are greater then key of this node. |
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| 70 | */ |
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| 71 | struct avltree_node *rgt; |
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| 72 | |||
| 73 | /** Pointer to parent node. Root node has NULL parent. */ |
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| 74 | struct avltree_node *par; |
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| 75 | |||
| 76 | /** Nodes key. */ |
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| 77 | uint64_t key; |
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| 78 | |||
| 79 | /** Difference between heights of left and right subtree of this node.*/ |
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| 80 | short balance; |
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| 81 | }; |
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| 82 | |||
| 83 | /** AVL tree structure. */ |
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| 84 | struct avltree |
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| 85 | { |
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| 86 | /** AVL root node pointer */ |
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| 87 | struct avltree_node *root; |
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| 88 | |||
| 89 | /** |
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| 90 | * Base of tree is value that is smaller or equal then every value in tree. |
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| 91 | * |
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| 92 | * Base is added to current key when new node is inserted into tree. |
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| 93 | * Base is changed to the key of node which is deleted with function |
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| 94 | * avltree_delete_min. |
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| 95 | */ |
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| 96 | uint64_t base; /**< POZOR: Base time for inserting new nodes */ |
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| 97 | }; |
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| 98 | |||
| 99 | |||
| 100 | /** Create empty AVL tree. |
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| 101 | * |
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| 102 | * @param t AVL tree. |
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| 103 | */ |
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| 104 | static inline void avltree_create (avltree_t *t) |
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| 105 | { |
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| 106 | t->root = NULL; |
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| 107 | t->base = 0; |
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| 108 | } |
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| 109 | |||
| 110 | /** Initialize node. |
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| 111 | * |
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| 112 | * @param Node which is initialized. |
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| 113 | */ |
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| 114 | static inline void avltree_node_initialize(avltree_node_t *node) |
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| 115 | { |
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| 116 | node->key = 0; |
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| 117 | node->lft = NULL; |
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| 118 | node->rgt = NULL; |
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| 119 | node->par = NULL; |
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| 120 | node->balance = 0; |
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| 121 | } |
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| 122 | |||
| 2421 | mencl | 123 | avltree_node_t *avltree_find_min(avltree_t *t); |
| 2416 | mencl | 124 | avltree_node_t *avltree_search(avltree_t *t, uint64_t key); |
| 125 | void avltree_insert(avltree_t *t, avltree_node_t *newnode); |
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| 126 | void avltree_delete(avltree_t *t, avltree_node_t *node); |
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| 2421 | mencl | 127 | bool avltree_delete_min(avltree_t *t); |
| 2416 | mencl | 128 | |
| 129 | #endif |
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| 130 | |||
| 131 | /** @} |
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| 132 | */ |