| 1 | /*
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| 2 | * Copyright (C) 2007 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 |
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| 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 |
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| 35 |
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| 36 | #ifndef KERN_AVLTREE_H_
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| 37 | #define KERN_AVLTREE_H_
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| 38 |
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| 39 | #include <arch/types.h>
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| 40 |
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| 41 | /**
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| 42 | * Macro for getting a pointer to the structure which contains the avltree
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| 43 | * structure.
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| 44 | *
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| 45 | * @param link Pointer to the avltree structure.
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| 46 | * @param type Name of the outer structure.
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| 47 | * @param member Name of avltree attribute in the outer structure.
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| 48 | */
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| 49 | #define avltree_get_instance(link, type, member) \
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| 50 | ((type *)(((uint8_t *)(link)) - ((uint8_t *) &(((type *) NULL)->member))))
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| 51 |
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| 52 |
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| 53 | typedef struct avltree_node avltree_node_t;
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| 54 | typedef struct avltree avltree_t;
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| 55 |
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| 56 |
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| 57 | /** AVL tree node structure. */
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| 58 | struct avltree_node
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| 59 | {
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| 60 | /**
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| 61 | * Pointer to the left descendant of this node.
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| 62 | *
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| 63 | * All keys of nodes in the left subtree are less than the key of this
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| 64 | * node.
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| 65 | */
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| 66 | struct avltree_node *lft;
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| 67 |
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| 68 | /**
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| 69 | * Pointer to the right descendant of this node.
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| 70 | *
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| 71 | * All keys of nodes in the right subtree are greater than the key of
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| 72 | * this node.
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| 73 | */
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| 74 | struct avltree_node *rgt;
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| 75 |
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| 76 | /** Pointer to the parent node. Root node has NULL parent. */
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| 77 | struct avltree_node *par;
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| 78 |
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| 79 | /** Node's key. */
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| 80 | uint64_t key;
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| 81 |
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| 82 | /**
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| 83 | * Difference between the heights of the left and the right subtree of
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| 84 | * this node.
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| 85 | */
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| 86 | int8_t balance;
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| 87 | };
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| 88 |
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| 89 | /** AVL tree structure. */
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| 90 | struct avltree
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| 91 | {
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| 92 | /** AVL root node pointer */
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| 93 | struct avltree_node *root;
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| 94 |
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| 95 | /**
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| 96 | * Base of the tree is a value that is smaller or equal than every value
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| 97 | * in the tree (valid for positive keys otherwise ignore this atribute).
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| 98 | *
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| 99 | * The base is added to the current key when a new node is inserted into
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| 100 | * the tree. The base is changed to the key of the node which is deleted
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| 101 | * with avltree_delete_min().
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| 102 | */
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| 103 | uint64_t base;
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| 104 | };
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| 105 |
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| 106 |
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| 107 | /** Create empty AVL tree.
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| 108 | *
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| 109 | * @param t AVL tree.
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| 110 | */
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| 111 | static inline void avltree_create (avltree_t *t)
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| 112 | {
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| 113 | t->root = NULL;
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| 114 | t->base = 0;
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| 115 | }
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| 116 |
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| 117 | /** Initialize node.
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| 118 | *
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| 119 | * @param node Node which is initialized.
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| 120 | */
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| 121 | static inline void avltree_node_initialize(avltree_node_t *node)
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| 122 | {
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| 123 | node->key = 0;
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| 124 | node->lft = NULL;
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| 125 | node->rgt = NULL;
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| 126 | node->par = NULL;
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| 127 | node->balance = 0;
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| 128 | }
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| 129 |
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| 130 | extern avltree_node_t *avltree_find_min(avltree_t *t);
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| 131 | extern avltree_node_t *avltree_search(avltree_t *t, uint64_t key);
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| 132 | extern void avltree_insert(avltree_t *t, avltree_node_t *newnode);
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| 133 | extern void avltree_delete(avltree_t *t, avltree_node_t *node);
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| 134 | extern bool avltree_delete_min(avltree_t *t);
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| 135 |
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| 136 | #endif
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| 137 |
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| 138 | /** @}
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| 139 | */
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