Mercurial > molko
annotate libmlk-core/mlk/core/alloc.h @ 602:7e168493f0bd
cmake: fix NLS required
author | David Demelier <markand@malikania.fr> |
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date | Thu, 10 Aug 2023 21:16:05 +0200 |
parents | 6c911cbc1fd7 |
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1 /* |
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2 * alloc.h -- memory allocators |
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3 * |
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4 * Copyright (c) 2020-2023 David Demelier <markand@malikania.fr> |
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5 * |
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6 * Permission to use, copy, modify, and/or distribute this software for any |
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7 * purpose with or without fee is hereby granted, provided that the above |
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8 * copyright notice and this permission notice appear in all copies. |
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9 * |
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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17 */ |
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18 |
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19 #ifndef MLK_CORE_ALLOC_H |
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20 #define MLK_CORE_ALLOC_H |
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21 |
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22 /** |
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23 * \file mlk/core/alloc.h |
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24 * \brief Memory allocators. |
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25 * |
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26 * This module provides function to dynamically allocate data on the heap. |
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27 * |
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28 * ## Synopsis |
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29 * |
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30 * Most of the Molko's Engine API does not allocate data except in very few |
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31 * cases, otherwise this module is used each time it is required. |
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32 * |
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33 * ## Pointer block |
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34 * |
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35 * Data allocated by this module isn't a simple pointer to the region data but |
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36 * a custom block data that holds the size of the element and the number of it. |
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37 * This has been designed in the sense that reallocating data is easier for the |
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38 * caller as it is not required to pass the data length along. |
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39 * |
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40 * An allocated blocks looks like this: |
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41 * |
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42 * | Type | Description | |
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43 * |-------------------|-----------------------------| |
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44 * | `size_t` | Number of items allocated | |
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45 * | `size_t` | Size of individual elements | |
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46 * | `unsigned char *` | User data | |
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47 * |
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48 * The structure is allocated using the [flexible array member][fam] to avoid |
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49 * allocating data twice. |
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50 * |
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51 * ### Example: allocating three ints |
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52 * |
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53 * Use the ::mlk_alloc_new function to allocate three ints with uninitialized |
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54 * memory. |
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55 * |
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56 * ```c |
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57 * int *ptr = mlk_alloc_new(3, sizeof (int)); |
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58 * |
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59 * ptr[0] = 10; |
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60 * ptr[1] = 20; |
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61 * ptr[2] = 30; |
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62 * ``` |
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63 * |
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64 * This generates the following blocks in memory. |
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65 * |
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66 * ``` |
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67 * +-----------------+----------------+------------------------+ |
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68 * | What | Value | Description | |
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69 * +-----------------+----------------+------------------------+ |
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70 * | size_t | 3 | Three `int` requested | |
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71 * | size_t | sizeof (int) | Size of one `int` | |
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72 * | unsigned char * | undefined | Content of user memory | |
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73 * +-----------------+----------------+------------------------+ |
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74 * ``` |
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75 * |
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76 * \warning The returned address is the `unsigned char *` so the user must |
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77 * never free this address directly. |
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78 * |
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79 * If you use ::mlk_alloc_resize, the storage will be expanded/shrinked |
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80 * automatically without the need to pass the actual size of the array. |
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81 * |
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82 * ```c |
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83 * ptr = mlk_alloc_renew(ptr, 6); |
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84 * |
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85 * // Now ptr holds 6 ints. |
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86 * // |
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87 * // ptr[0], ptr[1], ptr[2] are kept unchanged. |
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88 * // ptr[3-5] are uninitialized. |
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89 * ``` |
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90 * |
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91 * The block now looks like this: |
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92 * |
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93 * ``` |
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94 * +-----------------+----------------+------------------------+ |
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95 * | What | Value | Description | |
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96 * +-----------------+----------------+------------------------+ |
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97 * | size_t | 6 | Six `int` requested | |
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98 * | size_t | sizeof (int) | Size of one `int` | |
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99 * | unsigned char * | undefined | Content of user memory | |
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100 * +-----------------+----------------+------------------------+ |
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101 * ``` |
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102 * |
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103 * Finally, free the result using ::mlk_alloc_free, DON'T free the pointer |
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104 * directly. |
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105 * |
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106 * ```c |
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107 * mlk_alloc_free(ptr); |
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108 * ``` |
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109 * |
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110 * ## Custom allocators |
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111 * |
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112 * The whole library uses allocators defined in this module when it needs to |
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113 * allocate data. By default, C standard `malloc`, `realloc` and `free` are |
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114 * used but they call ::mlk_panic in case of memory exhaustion. |
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115 * |
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116 * Those functions can be overridden through the ::mlk_alloc_set function with a |
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117 * set of functions defined in the structure ::mlk_alloc_funcs. |
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118 * |
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119 * When using custom allocators, it is recommended to call ::mlk_alloc_set as |
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120 * early as possible because it will also set internal libraries to use those. |
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121 * |
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122 * [fam]: https://en.wikipedia.org/wiki/Flexible_array_member |
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123 */ |
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124 |
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125 #include <stddef.h> |
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126 |
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127 /** |
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128 * \struct mlk_alloc_funcs |
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129 * \brief Custom allocator |
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130 */ |
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131 struct mlk_alloc_funcs { |
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132 /** |
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133 * (read-write) |
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134 * |
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135 * Allocate the number of bytes uninitialized. |
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136 * |
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137 * \param size the number of bytes to allocate (always > 0) |
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138 * \return a pointer to the allocated memory or NULL on error |
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139 */ |
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140 void *(*alloc)(size_t size); |
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141 |
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142 /** |
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143 * (read-write) |
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144 * |
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145 * Realloc the pointer with the new size. |
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146 * |
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147 * \param ptr the pointer to reallocate (never NULL) |
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148 * \param size the new size (always > 0) |
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149 * \return a pointer to the allocated memory or NULL on error |
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150 */ |
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151 void *(*realloc)(void *, size_t); |
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152 |
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153 /** |
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154 * (read-write) |
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155 * |
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156 * Free the pointer memory. |
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157 * |
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158 * \param ptr the pointer to release |
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159 */ |
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160 void (*free)(void *); |
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161 }; |
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162 |
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163 #if defined(__cplusplus) |
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164 extern "C" { |
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165 #endif |
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166 |
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167 /** |
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168 * Replace the memory allocators. |
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169 * |
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170 * The parameter funcs must be kept alive until the program ends or it is |
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171 * replaced with a new value. |
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172 * |
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173 * \param funcs the new allocator or NULL to re-use the defaults |
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174 */ |
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175 void |
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176 mlk_alloc_set(const struct mlk_alloc_funcs *funcs); |
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177 |
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178 /** |
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179 * Allocates a block memory. |
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180 * |
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181 * \param n the number of elements to allocate |
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182 * \param w the size of each individual element |
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183 * \return whatever the allocator returned |
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184 */ |
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185 void * |
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186 mlk_alloc_new(size_t n, size_t w); |
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187 |
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188 /** |
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189 * \copydoc mlk_alloc_new |
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190 * |
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191 * Similar to ::mlk_alloc_new but also ensure the data is zero initialized. |
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192 */ |
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193 void * |
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194 mlk_alloc_new0(size_t n, size_t w); |
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195 |
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196 /** |
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197 * Reallocate a block memory. |
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198 * |
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199 * \note In contrast to standard `realloc` function, it is NOT possible to pass |
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200 * a NULL pointer in this function because it needs to know the initial |
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201 * block memory size. |
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202 * |
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203 * \pre ptr != NULL |
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204 * \pre n > 0 |
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205 * \param ptr the pointer to reallocate |
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206 * \param n the new size |
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207 * \return whatever the allocator returned to rearrange the pointer memory |
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208 */ |
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209 void * |
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210 mlk_alloc_resize(void *ptr, size_t n); |
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211 |
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212 /** |
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213 * \copydoc mlk_alloc_resize |
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214 * |
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215 * Similar to ::mlk_alloc_resize but also ensure expanded data is zero |
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216 * initialized. |
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217 */ |
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218 void * |
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219 mlk_alloc_resize0(void *ptr, size_t n); |
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220 |
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221 /** |
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222 * Similar to ::mlk_alloc_resize but expands the storage by n. |
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223 * |
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224 * Example, if the current pointer holds 10 `int`, passing 90 as n argument |
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225 * will expand the memory to a total of 100 `int`. |
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226 * |
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227 * \pre ptr != NULL |
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228 * \param ptr the pointer to expand |
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229 * \param n the number of items to append |
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230 * \return whatever the allocator returned to rearrange the pointer memory |
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231 */ |
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232 void * |
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233 mlk_alloc_expand(void *ptr, size_t n); |
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234 |
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235 /** |
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236 * \copydoc mlk_alloc_expand |
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237 * |
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238 * Similar to ::mlk_alloc_expand but also ensure expanded data is zero |
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239 * initialized. |
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240 */ |
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241 void * |
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242 mlk_alloc_expand0(void *ptr, size_t n); |
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243 |
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244 /** |
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245 * Duplicate a memory block. |
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246 * |
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247 * \pre ptr != NULL |
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248 * \param ptr the pointer to copy |
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249 * \param n the number of elements to allocate |
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250 * \param w the size of each individual element |
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251 * \return whatever the allocator returned |
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252 */ |
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253 void * |
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254 mlk_alloc_dup(const void *ptr, size_t n, size_t w); |
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255 |
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256 /** |
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257 * Duplicate a string. |
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258 * |
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259 * \pre src != NULL |
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260 * \param src the string to duplicate |
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261 * \return whatever the allocator returned |
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262 */ |
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263 char * |
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264 mlk_alloc_sdup(const char *src); |
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265 |
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266 /** |
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267 * Duplicate a string using a printf(3) format. |
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268 * |
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269 * \pre fmt != NULL |
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270 * \param fmt the printf(3) format string |
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271 * \return whatever the allocator returned |
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272 */ |
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273 char * |
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274 mlk_alloc_sdupf(const char *fmt, ...); |
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275 |
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276 /** |
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277 * Get the number of items in ptr. |
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278 * |
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279 * \pre ptr != NULL |
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280 * \param ptr the pointer block |
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281 * \return how many number of elements ptr holds |
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282 */ |
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283 size_t |
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284 mlk_alloc_getn(const void *ptr); |
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285 |
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286 /** |
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287 * Get the element width in ptr. |
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288 * |
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289 * \pre ptr != NULL |
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290 * \param ptr the pointer block |
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291 * \return size of individual elements ptr holds |
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292 */ |
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293 size_t |
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294 mlk_alloc_getw(const void *ptr); |
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295 |
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296 /** |
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297 * Free resources specified by pointer. |
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298 * |
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299 * If pointer is null, function is no-op. |
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300 * |
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301 * \param ptr the memory to release (maybe NULL) |
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302 */ |
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303 void |
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304 mlk_alloc_free(void *ptr); |
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305 |
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306 #if defined(__cplusplus) |
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307 } |
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308 #endif |
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309 |
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310 #endif /* !MLK_CORE_ALLOC_H */ |