Tue, 12 Dec 2017 15:51:09 +0100
dav 1.1.1 release
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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2016 Olaf Wintermann. All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. 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 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | |
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30 | /** |
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31 | * @file avl.h |
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32 | * |
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33 | * AVL tree implementation. |
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34 | * |
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35 | * This binary search tree implementation allows average O(1) insertion and |
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36 | * removal of elements (excluding binary search time). |
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37 | * |
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38 | * @author Mike Becker |
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39 | * @author Olaf Wintermann |
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40 | */ |
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41 | |
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42 | #ifndef UCX_AVL_H |
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43 | #define UCX_AVL_H |
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44 | |
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45 | #include "ucx.h" |
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46 | #include "allocator.h" |
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47 | #include <inttypes.h> |
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48 | |
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49 | #ifdef __cplusplus |
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50 | extern "C" { |
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51 | #endif |
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52 | |
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53 | /** |
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54 | * UCX AVL Node type. |
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55 | * |
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56 | * @see UcxAVLNode |
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57 | */ |
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58 | typedef struct UcxAVLNode UcxAVLNode; |
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59 | |
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60 | /** |
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61 | * UCX AVL Node. |
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62 | */ |
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63 | struct UcxAVLNode { |
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64 | /** |
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65 | * The key for this node. |
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66 | */ |
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67 | intptr_t key; |
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68 | /** |
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69 | * Data contained by this node. |
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70 | */ |
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71 | void *value; |
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72 | /** |
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73 | * The height of this (sub)-tree. |
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74 | */ |
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75 | size_t height; |
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76 | /** |
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77 | * Parent node. |
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78 | */ |
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79 | UcxAVLNode *parent; |
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80 | /** |
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81 | * Root node of left subtree. |
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82 | */ |
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83 | UcxAVLNode *left; |
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84 | /** |
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85 | * Root node of right subtree. |
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86 | */ |
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87 | UcxAVLNode *right; |
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88 | }; |
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89 | |
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90 | /** |
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91 | * UCX AVL Tree. |
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92 | */ |
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93 | typedef struct { |
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94 | /** |
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95 | * The UcxAllocator that shall be used to manage the memory for node data. |
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96 | */ |
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97 | UcxAllocator *allocator; |
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98 | /** |
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99 | * Root node of the tree. |
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100 | */ |
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101 | UcxAVLNode *root; |
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102 | /** |
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103 | * Compare function that shall be used to compare the UcxAVLNode keys. |
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104 | * @see UcxAVLNode.key |
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105 | */ |
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106 | cmp_func cmpfunc; |
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107 | /** |
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108 | * Custom user data. |
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109 | * This data will also be provided to the cmpfunc. |
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110 | */ |
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111 | void *userdata; |
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112 | } UcxAVLTree; |
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113 | |
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114 | /** |
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115 | * Initializes a new UcxAVLTree with a default allocator. |
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116 | * |
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117 | * @param cmpfunc the compare function that shall be used |
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118 | * @return a new UcxAVLTree object |
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119 | * @see ucx_avl_new_a() |
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120 | */ |
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121 | UcxAVLTree *ucx_avl_new(cmp_func cmpfunc); |
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122 | |
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123 | /** |
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124 | * Initializes a new UcxAVLTree with the specified allocator. |
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125 | * |
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126 | * The cmpfunc should be capable of comparing two keys within this AVL tree. |
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127 | * So if you want to use null terminated strings as keys, you could use the |
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128 | * ucx_strcmp() function here. |
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129 | * |
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130 | * @param cmpfunc the compare function that shall be used |
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131 | * @param allocator the UcxAllocator that shall be used |
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132 | * @return a new UcxAVLTree object |
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133 | */ |
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134 | UcxAVLTree *ucx_avl_new_a(cmp_func cmpfunc, UcxAllocator *allocator); |
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135 | |
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136 | /** |
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137 | * Destroys a UcxAVLTree. |
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138 | * @param tree the tree to destroy |
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139 | */ |
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140 | void ucx_avl_free(UcxAVLTree *tree); |
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141 | |
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142 | /** |
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143 | * Macro for initializing a new UcxAVLTree with the default allocator and a |
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144 | * ucx_ptrcmp() compare function. |
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145 | * |
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146 | * @return a new default UcxAVLTree object |
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147 | */ |
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148 | #define ucx_avl_default_new() ucx_avl_new_a(ucx_ptrcmp, ucx_default_allocator()) |
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149 | |
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150 | /** |
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151 | * Gets the node from the tree, that is associated with the specified key. |
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152 | * @param tree the UcxAVLTree |
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153 | * @param key the key |
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154 | * @return the node (or <code>NULL</code>, if the key is not present) |
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155 | */ |
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156 | UcxAVLNode *ucx_avl_get_node(UcxAVLTree *tree, intptr_t key); |
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157 | |
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158 | /** |
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159 | * Gets the value from the tree, that is associated with the specified key. |
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160 | * @param tree the UcxAVLTree |
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161 | * @param key the key |
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162 | * @return the value (or <code>NULL</code>, if the key is not present) |
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163 | */ |
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164 | void *ucx_avl_get(UcxAVLTree *tree, intptr_t key); |
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165 | |
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166 | /** |
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167 | * A mode for #ucx_avl_find_node() with the same behavior as |
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168 | * #ucx_avl_get_node(). |
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169 | */ |
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170 | #define UCX_AVL_FIND_EXACT 0 |
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171 | /** |
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172 | * A mode for #ucx_avl_find_node() finding the node whose key is at least |
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173 | * as large as the specified key. |
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174 | */ |
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175 | #define UCX_AVL_FIND_LOWER_BOUNDED 1 |
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176 | /** |
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177 | * A mode for #ucx_avl_find_node() finding the node whose key is at most |
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178 | * as large as the specified key. |
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179 | */ |
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180 | #define UCX_AVL_FIND_UPPER_BOUNDED 2 |
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181 | /** |
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182 | * A mode for #ucx_avl_find_node() finding the node with a key that is as close |
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183 | * to the specified key as possible. If the key is present, the behavior is |
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184 | * like #ucx_avl_get_node(). This mode only returns <code>NULL</code> on |
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185 | * empty trees. |
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186 | */ |
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187 | #define UCX_AVL_FIND_CLOSEST 3 |
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188 | |
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189 | /** |
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190 | * Finds a node within the tree. The following modes are supported: |
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191 | * <ul> |
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192 | * <li>#UCX_AVL_FIND_EXACT: the same behavior as #ucx_avl_get_node()</li> |
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193 | * <li>#UCX_AVL_FIND_LOWER_BOUNDED: finds the node whose key is at least |
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194 | * as large as the specified key</li> |
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195 | * <li>#UCX_AVL_FIND_UPPER_BOUNDED: finds the node whose key is at most |
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196 | * as large as the specified key</li> |
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197 | * <li>#UCX_AVL_FIND_CLOSEST: finds the node with a key that is as close to |
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198 | * the specified key as possible. If the key is present, the behavior is |
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199 | * like #ucx_avl_get_node(). This mode only returns <code>NULL</code> on |
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200 | * empty trees.</li> |
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201 | * </ul> |
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202 | * |
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203 | * The distance function provided MUST agree with the compare function of |
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204 | * the AVL tree. |
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205 | * |
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206 | * @param tree the UcxAVLTree |
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207 | * @param key the key |
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208 | * @param dfnc the distance function |
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209 | * @param mode the find mode |
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210 | * @return the node (or <code>NULL</code>, if no node can be found) |
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211 | */ |
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212 | UcxAVLNode *ucx_avl_find_node(UcxAVLTree *tree, intptr_t key, |
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213 | distance_func dfnc, int mode); |
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214 | |
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215 | /** |
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216 | * Finds a value within the tree. |
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217 | * See #ucx_avl_find_node() for details. |
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218 | * |
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219 | * @param tree the UcxAVLTree |
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220 | * @param key the key |
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221 | * @param dfnc the distance function |
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222 | * @param mode the find mode |
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223 | * @return the value (or <code>NULL</code>, if no value can be found) |
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224 | */ |
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225 | void *ucx_avl_find(UcxAVLTree *tree, intptr_t key, |
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226 | distance_func dfnc, int mode); |
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227 | |
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228 | /** |
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229 | * Puts a key/value pair into the tree. |
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230 | * |
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231 | * Attention: use this function only, if a possible old value does not need |
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232 | * to be preserved. |
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233 | * |
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234 | * @param tree the UcxAVLTree |
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235 | * @param key the key |
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236 | * @param value the new value |
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237 | * @return zero, if and only if the operation succeeded |
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238 | */ |
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239 | int ucx_avl_put(UcxAVLTree *tree, intptr_t key, void *value); |
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240 | |
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241 | /** |
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242 | * Puts a key/value pair into the tree. |
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243 | * |
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244 | * This is a secure function which saves the old value to the variable pointed |
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245 | * at by oldvalue. |
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246 | * |
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247 | * @param tree the UcxAVLTree |
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248 | * @param key the key |
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249 | * @param value the new value |
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250 | * @param oldvalue optional: a pointer to the location where a possible old |
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251 | * value shall be stored |
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252 | * @return zero, if and only if the operation succeeded |
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253 | */ |
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254 | int ucx_avl_put_s(UcxAVLTree *tree, intptr_t key, void *value, void **oldvalue); |
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255 | |
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256 | /** |
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257 | * Removes a node from the AVL tree. |
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258 | * |
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259 | * Note: the specified node is logically removed. The tree implementation |
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260 | * decides which memory area is freed. In most cases the here provided node |
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261 | * is freed, so its further use is generally undefined. |
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262 | * |
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263 | * @param tree the UcxAVLTree |
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264 | * @param node the node to remove |
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265 | * @return zero, if and only if an element has been removed |
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266 | */ |
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267 | int ucx_avl_remove_node(UcxAVLTree *tree, UcxAVLNode *node); |
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268 | |
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269 | /** |
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270 | * Removes an element from the AVL tree. |
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271 | * |
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272 | * @param tree the UcxAVLTree |
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273 | * @param key the key |
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274 | * @return zero, if and only if an element has been removed |
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275 | */ |
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276 | int ucx_avl_remove(UcxAVLTree *tree, intptr_t key); |
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277 | |
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278 | /** |
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279 | * Removes an element from the AVL tree. |
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280 | * |
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281 | * This is a secure function which saves the old key and value data from node |
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282 | * to the variables at the location of oldkey and oldvalue (if specified), so |
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283 | * they can be freed afterwards (if necessary). |
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284 | * |
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285 | * Note: the returned key in oldkey is possibly not the same as the provided |
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286 | * key for the lookup (in terms of memory location). |
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287 | * |
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288 | * @param tree the UcxAVLTree |
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289 | * @param key the key of the element to remove |
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290 | * @param oldkey optional: a pointer to the location where the old key shall be |
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291 | * stored |
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292 | * @param oldvalue optional: a pointer to the location where the old value |
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293 | * shall be stored |
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294 | * @return zero, if and only if an element has been removed |
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295 | */ |
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296 | int ucx_avl_remove_s(UcxAVLTree *tree, intptr_t key, |
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297 | intptr_t *oldkey, void **oldvalue); |
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298 | |
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299 | /** |
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300 | * Counts the nodes in the specified UcxAVLTree. |
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301 | * @param tree the AVL tree |
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302 | * @return the node count |
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303 | */ |
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304 | size_t ucx_avl_count(UcxAVLTree *tree); |
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305 | |
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306 | /** |
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307 | * Finds the in-order predecessor of the given node. |
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308 | * @param node an AVL node |
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309 | * @return the in-order predecessor of the given node, or <code>NULL</code> if |
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310 | * the given node is the in-order minimum |
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311 | */ |
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312 | UcxAVLNode* ucx_avl_pred(UcxAVLNode* node); |
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313 | |
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314 | /** |
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315 | * Finds the in-order successor of the given node. |
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316 | * @param node an AVL node |
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317 | * @return the in-order successor of the given node, or <code>NULL</code> if |
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318 | * the given node is the in-order maximum |
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319 | */ |
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320 | UcxAVLNode* ucx_avl_succ(UcxAVLNode* node); |
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321 | |
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322 | #ifdef __cplusplus |
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323 | } |
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324 | #endif |
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325 | |
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326 | #endif /* UCX_AVL_H */ |
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327 |