src/cx/array_list.h

Sat, 05 Oct 2024 19:05:47 +0200

author
Mike Becker <universe@uap-core.de>
date
Sat, 05 Oct 2024 19:05:47 +0200
changeset 909
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parent 891
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child 926
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permissions
-rw-r--r--

implement cxTreeRemove() with re-link function

fixes #437

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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 2021 Mike Becker, 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 * \file array_list.h
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30 * \brief Array list implementation.
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31 * \details Also provides several low-level functions for custom array list implementations.
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32 * \author Mike Becker
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33 * \author Olaf Wintermann
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34 * \copyright 2-Clause BSD License
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35 */
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36
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37
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38 #ifndef UCX_ARRAY_LIST_H
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39 #define UCX_ARRAY_LIST_H
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40
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41 #include "list.h"
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42
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43 #ifdef __cplusplus
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44 extern "C" {
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45 #endif
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46
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47 /**
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48 * The maximum item size in an array list that fits into stack buffer when swapped.
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49 */
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50 extern unsigned cx_array_swap_sbo_size;
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51
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52 /**
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53 * Declares variables for an array that can be used with the convenience macros.
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54 *
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55 * @see cx_array_simple_add()
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56 * @see cx_array_simple_copy()
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57 * @see cx_array_initialize()
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58 * @see cx_array_simple_add_sorted()
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59 * @see cx_array_simple_insert_sorted()
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60 */
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61 #define CX_ARRAY_DECLARE(type, name) \
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62 type * name; \
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63 size_t name##_size; \
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64 size_t name##_capacity
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65
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66 /**
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67 * Initializes an array declared with CX_ARRAY_DECLARE().
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68 *
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69 * The memory for the array is allocated with stdlib malloc().
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70 * @param array the array
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71 * @param capacity the initial capacity
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72 */
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73 #define cx_array_initialize(array, capacity) \
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74 array##_capacity = capacity; \
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75 array##_size = 0; \
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76 array = malloc(sizeof(array[0]) * capacity)
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77
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78 /**
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79 * Defines a reallocation mechanism for arrays.
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80 */
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81 struct cx_array_reallocator_s {
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82 /**
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83 * Reallocates space for the given array.
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84 *
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85 * Implementations are not required to free the original array.
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86 * This allows reallocation of static memory by allocating heap memory
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87 * and copying the array contents. The information in the custom fields of
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88 * the referenced allocator can be used to track the state of the memory
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89 * or to transport other additional data.
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90 *
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91 * @param array the array to reallocate
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92 * @param capacity the new capacity (number of elements)
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93 * @param elem_size the size of each element
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94 * @param alloc a reference to this allocator
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95 * @return a pointer to the reallocated memory or \c NULL on failure
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96 */
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97 void *(*realloc)(
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98 void *array,
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99 size_t capacity,
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100 size_t elem_size,
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101 struct cx_array_reallocator_s *alloc
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102 );
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103
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104 /**
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105 * Custom data pointer.
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106 */
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107 void *ptr1;
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108 /**
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109 * Custom data pointer.
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110 */
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111 void *ptr2;
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112 /**
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113 * Custom data integer.
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114 */
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115 size_t int1;
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116 /**
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117 * Custom data integer.
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118 */
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119 size_t int2;
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120 };
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121
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122 /**
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123 * A default stdlib-based array reallocator.
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124 */
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125 extern struct cx_array_reallocator_s *cx_array_default_reallocator;
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126
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127 /**
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128 * Return codes for array functions.
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129 */
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130 enum cx_array_result {
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131 CX_ARRAY_SUCCESS,
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132 CX_ARRAY_REALLOC_NOT_SUPPORTED,
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133 CX_ARRAY_REALLOC_FAILED,
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134 };
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135
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136 /**
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137 * Copies elements from one array to another.
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138 *
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139 * The elements are copied to the \p target array at the specified \p index,
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140 * overwriting possible elements. The \p index does not need to be in range of
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141 * the current array \p size. If the new index plus the number of elements added
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142 * would extend the array's size, and \p capacity is not \c NULL, the remaining
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143 * capacity is used.
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144 *
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145 * If the capacity is insufficient to hold the new data, a reallocation
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146 * attempt is made, unless the \p reallocator is set to \c NULL, in which case
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147 * this function ultimately returns a failure.
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148 *
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149 * @param target a pointer to the target array
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150 * @param size a pointer to the size of the target array
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151 * @param capacity a pointer to the target array's capacity -
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152 * \c NULL if only the size shall be used to bound the array (reallocations
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153 * will NOT be supported in that case)
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154 * @param index the index where the copied elements shall be placed
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155 * @param src the source array
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156 * @param elem_size the size of one element
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157 * @param elem_count the number of elements to copy
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158 * @param reallocator the array reallocator to use, or \c NULL
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159 * if reallocation shall not happen
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160 * @return zero on success, non-zero error code on failure
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161 */
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162 __attribute__((__nonnull__(1, 2, 5)))
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163 enum cx_array_result cx_array_copy(
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164 void **target,
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165 size_t *size,
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166 size_t *capacity,
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167 size_t index,
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168 const void *src,
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169 size_t elem_size,
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170 size_t elem_count,
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171 struct cx_array_reallocator_s *reallocator
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172 );
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173
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174 /**
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175 * Convenience macro that uses cx_array_copy() with a default layout and the default reallocator.
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176 *
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177 * @param array the name of the array (NOT a pointer to the array)
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178 * @param index the index where the copied elements shall be placed
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179 * @param src the source array
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180 * @param count the number of elements to copy
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181 * @see CX_ARRAY_DECLARE()
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182 */
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183 #define cx_array_simple_copy(array, index, src, count) \
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184 cx_array_copy((void**)&(array), &(array##_size), &(array##_capacity), \
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185 index, src, sizeof((array)[0]), count, cx_array_default_reallocator)
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186
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187 /**
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188 * Adds an element to an array with the possibility of allocating more space.
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189 *
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190 * The element \p elem is added to the end of the \p target array which containing
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191 * \p size elements, already. The \p capacity must not be \c NULL and point a
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192 * variable holding the current maximum number of elements the array can hold.
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193 *
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194 * If the capacity is insufficient to hold the new element, and the optional
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195 * \p reallocator is not \c NULL, an attempt increase the \p capacity is made
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196 * and the new capacity is written back.
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197 *
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198 * @param target a pointer to the target array
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199 * @param size a pointer to the size of the target array
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200 * @param capacity a pointer to the target array's capacity - must not be \c NULL
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201 * @param elem_size the size of one element
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202 * @param elem a pointer to the element to add
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203 * @param reallocator the array reallocator to use, or \c NULL if reallocation shall not happen
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204 * @return zero on success, non-zero error code on failure
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205 */
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206 #define cx_array_add(target, size, capacity, elem_size, elem, reallocator) \
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207 cx_array_copy((void**)(target), size, capacity, *(size), elem, elem_size, 1, reallocator)
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208
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209 /**
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210 * Convenience macro that uses cx_array_add() with a default layout and
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211 * the default reallocator.
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212 *
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213 * @param array the name of the array (NOT a pointer to the array)
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214 * @param elem the element to add (NOT a pointer, address is automatically taken)
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215 * @see CX_ARRAY_DECLARE()
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216 */
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217 #define cx_array_simple_add(array, elem) \
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218 cx_array_simple_copy(array, array##_size, &(elem), 1)
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219
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220
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221 /**
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222 * Inserts a sorted array into another sorted array.
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223 *
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224 * If either the target or the source array is not already sorted with respect
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225 * to the specified \p cmp_func, the behavior is undefined.
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226 *
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227 * If the capacity is insufficient to hold the new data, a reallocation
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228 * attempt is made.
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229 *
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230 * @param target a pointer to the target array
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231 * @param size a pointer to the size of the target array
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232 * @param capacity a pointer to the target array's capacity
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233 * @param cmp_func the compare function for the elements
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234 * @param src the source array
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235 * @param elem_size the size of one element
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236 * @param elem_count the number of elements to insert
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237 * @param reallocator the array reallocator to use
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238 * @return zero on success, non-zero error code on failure
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239 */
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240 __attribute__((__nonnull__))
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241 enum cx_array_result cx_array_insert_sorted(
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242 void **target,
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243 size_t *size,
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244 size_t *capacity,
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245 cx_compare_func cmp_func,
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246 const void *src,
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247 size_t elem_size,
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248 size_t elem_count,
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249 struct cx_array_reallocator_s *reallocator
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250 );
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251
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252 /**
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253 * Inserts an element into a sorted array.
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254 *
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255 * If the target array is not already sorted with respect
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256 * to the specified \p cmp_func, the behavior is undefined.
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257 *
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258 * If the capacity is insufficient to hold the new data, a reallocation
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259 * attempt is made.
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260 *
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261 * @param target a pointer to the target array
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262 * @param size a pointer to the size of the target array
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263 * @param capacity a pointer to the target array's capacity
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264 * @param elem_size the size of one element
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265 * @param elem a pointer to the element to add
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266 * @param reallocator the array reallocator to use
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267 * @return zero on success, non-zero error code on failure
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268 */
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269 #define cx_array_add_sorted(target, size, capacity, elem_size, elem, cmp_func, reallocator) \
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270 cx_array_insert_sorted((void**)(target), size, capacity, cmp_func, elem, elem_size, 1, reallocator)
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271
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272 /**
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273 * Convenience macro for cx_array_add_sorted() with a default
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274 * layout and the default reallocator.
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275 *
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276 * @param array the name of the array (NOT a pointer to the array)
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277 * @param elem the element to add (NOT a pointer, address is automatically taken)
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278 * @param cmp_func the compare function for the elements
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279 * @see CX_ARRAY_DECLARE()
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280 */
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281 #define cx_array_simple_add_sorted(array, elem, cmp_func) \
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282 cx_array_add_sorted(&array, &(array##_size), &(array##_capacity), \
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283 sizeof((array)[0]), &(elem), cmp_func, cx_array_default_reallocator)
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284
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285 /**
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286 * Convenience macro for cx_array_insert_sorted() with a default
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287 * layout and the default reallocator.
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288 *
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289 * @param array the name of the array (NOT a pointer to the array)
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290 * @param src pointer to the source array
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291 * @param n number of elements in the source array
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292 * @param cmp_func the compare function for the elements
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293 * @see CX_ARRAY_DECLARE()
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294 */
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295 #define cx_array_simple_insert_sorted(array, src, n, cmp_func) \
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296 cx_array_insert_sorted((void**)(&array), &(array##_size), &(array##_capacity), \
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297 cmp_func, src, sizeof((array)[0]), n, cx_array_default_reallocator)
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298
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299
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300 /**
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301 * Searches the largest lower bound in a sorted array.
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302 *
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303 * In other words, this function returns the index of the largest element
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304 * in \p arr that is less or equal to \p elem with respect to \p cmp_func.
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305 * When no such element exists, \p size is returned.
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306 *
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307 * If \p elem is contained in the array, this is identical to
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308 * #cx_array_binary_search().
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309 *
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310 * If the array is not sorted with respect to the \p cmp_func, the behavior
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311 * is undefined.
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312 *
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313 * @param arr the array to search
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314 * @param size the size of the array
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315 * @param elem_size the size of one element
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316 * @param elem the element to find
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317 * @param cmp_func the compare function
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318 * @return the index of the largest lower bound, or \p size
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319 */
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320 __attribute__((__nonnull__))
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321 size_t cx_array_binary_search_inf(
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322 const void *arr,
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323 size_t size,
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324 size_t elem_size,
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325 const void *elem,
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326 cx_compare_func cmp_func
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327 );
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328
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329 /**
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330 * Searches an item in a sorted array.
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331 *
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332 * If the array is not sorted with respect to the \p cmp_func, the behavior
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333 * is undefined.
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334 *
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335 * @param arr the array to search
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336 * @param size the size of the array
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337 * @param elem_size the size of one element
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338 * @param elem the element to find
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339 * @param cmp_func the compare function
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340 * @return the index of the element in the array, or \p size if the element
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341 * cannot be found
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342 */
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343 __attribute__((__nonnull__))
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344 static inline size_t cx_array_binary_search(
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345 const void *arr,
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346 size_t size,
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347 size_t elem_size,
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348 const void *elem,
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349 cx_compare_func cmp_func
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350 ) {
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351 size_t index = cx_array_binary_search_inf(
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352 arr, size, elem_size, elem, cmp_func
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353 );
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354 if (index < size && cmp_func(((const char *) arr) + index * elem_size, elem) == 0) {
884
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355 return index;
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356 } else {
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357 return size;
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358 }
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359 }
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360
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361 /**
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362 * Searches the smallest upper bound in a sorted array.
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363 *
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364 * In other words, this function returns the index of the smallest element
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365 * in \p arr that is greater or equal to \p elem with respect to \p cmp_func.
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366 * When no such element exists, \p size is returned.
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367 *
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368 * If \p elem is contained in the array, this is identical to
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369 * #cx_array_binary_search().
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370 *
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371 * If the array is not sorted with respect to the \p cmp_func, the behavior
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372 * is undefined.
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373 *
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374 * @param arr the array to search
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375 * @param size the size of the array
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376 * @param elem_size the size of one element
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377 * @param elem the element to find
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378 * @param cmp_func the compare function
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379 * @return the index of the smallest upper bound, or \p size
886
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380 */
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381 __attribute__((__nonnull__))
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382 static inline size_t cx_array_binary_search_sup(
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383 const void *arr,
886
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384 size_t size,
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385 size_t elem_size,
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386 const void *elem,
886
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387 cx_compare_func cmp_func
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388 ) {
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389 size_t inf = cx_array_binary_search_inf(arr, size, elem_size, elem, cmp_func);
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390 if (inf == size) {
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391 // no infimum means, first element is supremum
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392 return 0;
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393 } else if (cmp_func(((const char *) arr) + inf * elem_size, elem) == 0) {
886
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394 return inf;
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395 } else {
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396 return inf + 1;
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397 }
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398 }
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399
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400 /**
623
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401 * Swaps two array elements.
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402 *
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403 * @param arr the array
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404 * @param elem_size the element size
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405 * @param idx1 index of first element
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406 * @param idx2 index of second element
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407 */
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408 __attribute__((__nonnull__))
623
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409 void cx_array_swap(
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410 void *arr,
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411 size_t elem_size,
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412 size_t idx1,
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413 size_t idx2
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414 );
623
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415
608
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diff changeset
416 /**
855
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417 * Allocates an array list for storing elements with \p elem_size bytes each.
606
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418 *
855
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419 * If \p elem_size is CX_STORE_POINTERS, the created list will be created as if
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420 * cxListStorePointers() was called immediately after creation and the compare
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421 * function will be automatically set to cx_cmp_ptr(), if none is given.
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422 *
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423 * @param allocator the allocator for allocating the list memory
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424 * (if \c NULL the cxDefaultAllocator will be used)
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425 * @param comparator the comparator for the elements
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426 * (if \c NULL, and the list is not storing pointers, sort and find
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427 * functions will not work)
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428 * @param elem_size the size of each element in bytes
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429 * @param initial_capacity the initial number of elements the array can store
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430 * @return the created list
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431 */
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432 CxList *cxArrayListCreate(
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433 const CxAllocator *allocator,
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434 cx_compare_func comparator,
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435 size_t elem_size,
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436 size_t initial_capacity
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437 );
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438
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439 /**
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440 * Allocates an array list for storing elements with \p elem_size bytes each.
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441 *
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442 * The list will use the cxDefaultAllocator and \em NO compare function.
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443 * If you want to call functions that need a compare function, you have to
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444 * set it immediately after creation or use cxArrayListCreate().
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445 *
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446 * If \p elem_size is CX_STORE_POINTERS, the created list will be created as if
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447 * cxListStorePointers() was called immediately after creation and the compare
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448 * function will be automatically set to cx_cmp_ptr().
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449 *
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450 * @param elem_size the size of each element in bytes
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451 * @param initial_capacity the initial number of elements the array can store
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452 * @return the created list
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453 */
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454 #define cxArrayListCreateSimple(elem_size, initial_capacity) \
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455 cxArrayListCreate(NULL, NULL, elem_size, initial_capacity)
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456
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457 #ifdef __cplusplus
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458 } // extern "C"
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459 #endif
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460
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461 #endif // UCX_ARRAY_LIST_H

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