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use c99 bool + add test for low level find
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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 allocator.h |
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30 | * Interface for custom allocators. |
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31 | */ |
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32 | |
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33 | #ifndef UCX_ALLOCATOR_H |
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34 | #define UCX_ALLOCATOR_H |
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35 | |
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36 | #include "common.h" |
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37 | |
415 | 38 | #ifdef __cplusplus |
39 | extern "C" { | |
40 | #endif | |
41 | ||
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42 | /** |
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43 | * The class definition for an allocator. |
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44 | */ |
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45 | typedef struct { |
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46 | /** |
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47 | * The allocator's malloc() implementation. |
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48 | */ |
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49 | void *(*malloc)(void *data, size_t n); |
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50 | |
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51 | /** |
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52 | * The allocator's realloc() implementation. |
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53 | */ |
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54 | void *(*realloc)(void *data, void *mem, size_t n) |
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55 | __attribute__((__warn_unused_result__)); |
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56 | |
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57 | /** |
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58 | * The allocator's calloc() implementation. |
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59 | */ |
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60 | void *(*calloc)(void *data, size_t nelem, size_t n); |
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61 | |
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62 | /** |
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63 | * The allocator's free() implementation. |
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64 | */ |
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65 | void (*free)(void *data, void *mem) |
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66 | __attribute__((__nonnull__)); |
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67 | } cx_allocator_class; |
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68 | |
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69 | /** |
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70 | * Structure holding the data for an allocator. |
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71 | */ |
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72 | struct cx_allocator_s { |
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73 | /** |
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74 | * A pointer to the instance of the allocator class. |
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75 | */ |
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76 | cx_allocator_class *cl; |
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77 | /** |
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78 | * A pointer to the data this allocator uses. |
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79 | */ |
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80 | void *data; |
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81 | }; |
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82 | |
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83 | /** |
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84 | * High-Level type alias for the allocator type. |
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85 | */ |
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86 | typedef struct cx_allocator_s *CxAllocator; |
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87 | |
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88 | /** |
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89 | * A default allocator using standard library malloc() etc. |
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90 | */ |
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91 | extern CxAllocator cxDefaultAllocator; |
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92 | |
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93 | /** |
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94 | * Allocate \p n bytes of memory. |
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95 | * |
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96 | * @param allocator the allocator |
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97 | * @param n the number of bytes |
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98 | * @return a pointer to the allocated memory |
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99 | */ |
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100 | void *cxMalloc(CxAllocator allocator, size_t n) |
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101 | __attribute__((__malloc__)) |
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102 | __attribute__((__alloc_size__(2))); |
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103 | |
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104 | /** |
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105 | * Re-allocate the previously allocated block in \p mem, making the new block \p n bytes long. |
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106 | * This function may return the same pointer that was passed to it, if moving the memory |
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107 | * was not necessary. |
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108 | * |
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109 | * \note Re-allocating a block allocated by a different allocator is undefined. |
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110 | * |
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111 | * @param allocator the allocator |
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112 | * @param mem pointer to the previously allocated block |
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113 | * @param n the new size in bytes |
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114 | * @return a pointer to the re-allocated memory |
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115 | */ |
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116 | void *cxRealloc(CxAllocator allocator, void *mem, size_t n) |
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117 | __attribute__((__warn_unused_result__)) |
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118 | __attribute__((__alloc_size__(3))); |
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119 | |
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120 | /** |
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121 | * Re-allocate a previously allocated block and changes the pointer in-place, if necessary. |
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122 | * This function acts like cxRealloc() using the pointer pointed to by \p mem. |
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123 | * On success, the pointer is changed to the new location (in case the |
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124 | * |
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125 | * \note Re-allocating a block allocated by a different allocator is undefined. |
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126 | * |
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127 | * \par Error handling |
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128 | * \c errno will be set, if the underlying realloc function does so. |
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129 | * |
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130 | * @param allocator the allocator |
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131 | * @param mem pointer to the pointer to allocated block |
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132 | * @param n the new size in bytes |
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133 | * @return zero on success, non-zero on failure |
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134 | */ |
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135 | int cxReallocate(CxAllocator allocator, void **mem, size_t n) |
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136 | __attribute__((__nonnull__)); |
414 | 137 | |
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138 | /** |
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139 | * Allocate \p nelem elements of \p n bytes each, all initialized to zero. |
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140 | * |
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141 | * @param allocator the allocator |
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142 | * @param nelem the number of elements |
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143 | * @param n the size of each element in bytes |
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144 | * @return a pointer to the allocated memory |
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145 | */ |
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146 | void *cxCalloc(CxAllocator allocator, size_t nelem, size_t n) |
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147 | __attribute__((__malloc__)) |
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148 | __attribute__((__alloc_size__(2, 3))); |
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149 | |
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150 | /** |
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151 | * Free a block allocated by this allocator. |
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152 | * |
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153 | * \note Freeing a block of a different allocator is undefined. |
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154 | * |
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155 | * @param allocator the allocator |
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156 | * @param mem a pointer to the block to free |
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157 | */ |
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158 | void cxFree(CxAllocator allocator, void *mem) |
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159 | __attribute__((__nonnull__)); |
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160 | |
415 | 161 | #ifdef __cplusplus |
162 | } /* extern "C" */ | |
163 | #endif | |
164 | ||
393 | 165 | #endif /* UCX_ALLOCATOR_H */ |