Sun, 21 May 2023 14:37:56 +0200
add empty map implementation - fixes #259
606 | 1 | /* |
2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. | |
3 | * | |
4 | * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions are met: | |
8 | * | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * | |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
15 | * | |
16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE | |
20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
26 | * POSSIBILITY OF SUCH DAMAGE. | |
27 | */ | |
28 | ||
29 | #include "cx/array_list.h" | |
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30 | #include <assert.h> |
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31 | #include <string.h> |
606 | 32 | |
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33 | // LOW LEVEL ARRAY LIST FUNCTIONS |
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34 | |
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35 | enum cx_array_copy_result cx_array_copy( |
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36 | void **target, |
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37 | size_t *size, |
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38 | size_t *capacity, |
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39 | size_t index, |
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40 | void const *src, |
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41 | size_t elem_size, |
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42 | size_t elem_count, |
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43 | struct cx_array_reallocator_s *reallocator |
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44 | ) { |
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45 | // assert pointers |
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46 | assert(target != NULL); |
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47 | assert(size != NULL); |
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48 | assert(src != NULL); |
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49 | |
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50 | // determine capacity |
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51 | size_t cap = capacity == NULL ? *size : *capacity; |
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52 | |
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53 | // check if resize is required |
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54 | size_t minsize = index + elem_count; |
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55 | size_t newsize = *size < minsize ? minsize : *size; |
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56 | bool needrealloc = newsize > cap; |
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57 | |
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58 | // reallocate if possible |
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59 | if (needrealloc) { |
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60 | // a reallocator and a capacity variable must be available |
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61 | if (reallocator == NULL || capacity == NULL) { |
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62 | return CX_ARRAY_COPY_REALLOC_NOT_SUPPORTED; |
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63 | } |
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64 | |
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65 | // check, if we need to repair the src pointer |
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66 | uintptr_t targetaddr = (uintptr_t) *target; |
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67 | uintptr_t srcaddr = (uintptr_t) src; |
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68 | bool repairsrc = targetaddr <= srcaddr |
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69 | && srcaddr < targetaddr + cap * elem_size; |
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70 | |
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71 | // calculate new capacity (next number divisible by 16) |
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72 | cap = newsize - (newsize % 16) + 16; |
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73 | assert(cap > newsize); |
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74 | |
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75 | // perform reallocation |
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76 | void *newmem = reallocator->realloc( |
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77 | *target, cap, elem_size, reallocator |
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78 | ); |
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79 | if (newmem == NULL) { |
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80 | return CX_ARRAY_COPY_REALLOC_FAILED; |
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81 | } |
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82 | |
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83 | // repair src pointer, if necessary |
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84 | if (repairsrc) { |
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85 | src = ((char *) newmem) + (srcaddr - targetaddr); |
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86 | } |
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87 | |
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88 | // store new pointer and capacity |
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89 | *target = newmem; |
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90 | *capacity = cap; |
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91 | } |
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92 | |
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93 | // determine target pointer |
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94 | char *start = *target; |
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95 | start += index * elem_size; |
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96 | |
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97 | // copy elements and set new size |
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98 | memmove(start, src, elem_count * elem_size); |
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99 | *size = newsize; |
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100 | |
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101 | // return successfully |
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102 | return CX_ARRAY_COPY_SUCCESS; |
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103 | } |
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104 | |
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105 | #ifndef CX_ARRAY_SWAP_SBO_SIZE |
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106 | #define CX_ARRAY_SWAP_SBO_SIZE 512 |
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107 | #endif |
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108 | |
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109 | void cx_array_swap( |
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110 | void *arr, |
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111 | size_t elem_size, |
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112 | size_t idx1, |
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113 | size_t idx2 |
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114 | ) { |
660 | 115 | assert(arr != NULL); |
116 | ||
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117 | // short circuit |
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118 | if (idx1 == idx2) return; |
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119 | |
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120 | char sbo_mem[CX_ARRAY_SWAP_SBO_SIZE]; |
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121 | void *tmp; |
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122 | |
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123 | // decide if we can use the local buffer |
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124 | if (elem_size > CX_ARRAY_SWAP_SBO_SIZE) { |
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125 | tmp = malloc(elem_size); |
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126 | // we don't want to enforce error handling |
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127 | if (tmp == NULL) abort(); |
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128 | } else { |
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129 | tmp = sbo_mem; |
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130 | } |
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131 | |
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132 | // calculate memory locations |
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133 | char *left = arr, *right = arr; |
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134 | left += idx1 * elem_size; |
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135 | right += idx2 * elem_size; |
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136 | |
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137 | // three-way swap |
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138 | memcpy(tmp, left, elem_size); |
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139 | memcpy(left, right, elem_size); |
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140 | memcpy(right, tmp, elem_size); |
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141 | |
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142 | // free dynamic memory, if it was needed |
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143 | if (tmp != sbo_mem) { |
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144 | free(tmp); |
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145 | } |
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146 | } |
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147 | |
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148 | // HIGH LEVEL ARRAY LIST FUNCTIONS |
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149 | |
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150 | typedef struct { |
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151 | struct cx_list_s base; |
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152 | void *data; |
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153 | size_t capacity; |
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154 | struct cx_array_reallocator_s reallocator; |
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155 | } cx_array_list; |
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156 | |
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157 | static void *cx_arl_realloc( |
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158 | void *array, |
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159 | size_t capacity, |
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160 | size_t elem_size, |
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161 | struct cx_array_reallocator_s *alloc |
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162 | ) { |
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163 | // retrieve the pointer to the list allocator |
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164 | CxAllocator const *al = alloc->ptr1; |
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165 | |
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166 | // use the list allocator to reallocate the memory |
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167 | return cxRealloc(al, array, capacity * elem_size); |
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168 | } |
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169 | |
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170 | static void cx_arl_destructor(struct cx_list_s *list) { |
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171 | cx_array_list *arl = (cx_array_list *) list; |
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172 | cxFree(list->allocator, arl->data); |
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173 | } |
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174 | |
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175 | static size_t cx_arl_insert_array( |
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176 | struct cx_list_s *list, |
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177 | size_t index, |
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178 | void const *array, |
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179 | size_t n |
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180 | ) { |
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181 | // out of bounds and special case check |
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182 | if (index > list->size || n == 0) return 0; |
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183 | |
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184 | // get a correctly typed pointer to the list |
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185 | cx_array_list *arl = (cx_array_list *) list; |
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186 | |
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187 | // do we need to move some elements? |
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188 | if (index < list->size) { |
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189 | char const *first_to_move = (char const *) arl->data; |
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190 | first_to_move += index * list->item_size; |
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191 | size_t elems_to_move = list->size - index; |
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192 | size_t start_of_moved = index + n; |
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193 | |
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194 | if (CX_ARRAY_COPY_SUCCESS != cx_array_copy( |
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195 | &arl->data, |
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196 | &list->size, |
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197 | &arl->capacity, |
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198 | start_of_moved, |
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199 | first_to_move, |
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200 | list->item_size, |
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201 | elems_to_move, |
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202 | &arl->reallocator |
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203 | )) { |
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204 | // if moving existing elems is unsuccessful, abort |
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205 | return 0; |
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206 | } |
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207 | } |
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208 | |
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209 | // note that if we had to move the elements, the following operation |
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210 | // is guaranteed to succeed, because we have the memory already allocated |
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211 | // therefore, it is impossible to leave this function with an invalid array |
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212 | |
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213 | // place the new elements |
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214 | if (CX_ARRAY_COPY_SUCCESS == cx_array_copy( |
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215 | &arl->data, |
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216 | &list->size, |
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217 | &arl->capacity, |
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218 | index, |
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219 | array, |
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220 | list->item_size, |
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221 | n, |
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222 | &arl->reallocator |
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223 | )) { |
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224 | return n; |
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225 | } else { |
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226 | // array list implementation is "all or nothing" |
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227 | return 0; |
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228 | } |
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229 | } |
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230 | |
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231 | static int cx_arl_insert_element( |
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232 | struct cx_list_s *list, |
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233 | size_t index, |
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234 | void const *element |
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235 | ) { |
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236 | return 1 != cx_arl_insert_array(list, index, element, 1); |
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237 | } |
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238 | |
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239 | static int cx_arl_insert_iter( |
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240 | struct cx_mut_iterator_s *iter, |
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241 | void const *elem, |
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242 | int prepend |
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243 | ) { |
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244 | struct cx_list_s *list = iter->src_handle; |
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245 | if (iter->index < list->size) { |
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246 | int result = cx_arl_insert_element( |
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247 | list, |
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248 | iter->index + 1 - prepend, |
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249 | elem |
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250 | ); |
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251 | if (result == 0 && prepend != 0) { |
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252 | iter->index++; |
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253 | iter->elem_handle = ((char *) iter->elem_handle) + list->item_size; |
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254 | } |
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255 | return result; |
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256 | } else { |
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257 | int result = cx_arl_insert_element(list, list->size, elem); |
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258 | iter->index = list->size; |
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259 | return result; |
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260 | } |
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261 | } |
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262 | |
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263 | static int cx_arl_remove( |
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264 | struct cx_list_s *list, |
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265 | size_t index |
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266 | ) { |
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267 | cx_array_list *arl = (cx_array_list *) list; |
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268 | |
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269 | // out-of-bounds check |
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270 | if (index >= list->size) { |
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271 | return 1; |
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272 | } |
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273 | |
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274 | // content destruction |
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276 | |
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277 | // short-circuit removal of last element |
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278 | if (index == list->size - 1) { |
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279 | list->size--; |
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280 | return 0; |
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281 | } |
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282 | |
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283 | // just move the elements starting at index to the left |
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284 | int result = cx_array_copy( |
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285 | &arl->data, |
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286 | &list->size, |
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287 | &arl->capacity, |
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288 | index, |
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289 | ((char *) arl->data) + (index + 1) * list->item_size, |
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290 | list->item_size, |
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291 | list->size - index - 1, |
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292 | &arl->reallocator |
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293 | ); |
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294 | if (result == 0) { |
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295 | // decrease the size |
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296 | list->size--; |
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297 | } |
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298 | return result; |
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299 | } |
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300 | |
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301 | static void cx_arl_clear(struct cx_list_s *list) { |
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302 | if (list->size == 0) return; |
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303 | |
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304 | cx_array_list *arl = (cx_array_list *) list; |
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305 | char *ptr = arl->data; |
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306 | |
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307 | if (list->simple_destructor) { |
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308 | for (size_t i = 0; i < list->size; i++) { |
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309 | cx_invoke_simple_destructor(list, ptr); |
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310 | ptr += list->item_size; |
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311 | } |
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312 | } |
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313 | if (list->advanced_destructor) { |
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314 | for (size_t i = 0; i < list->size; i++) { |
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315 | cx_invoke_advanced_destructor(list, ptr); |
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316 | ptr += list->item_size; |
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317 | } |
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318 | } |
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319 | |
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320 | memset(arl->data, 0, list->size * list->item_size); |
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321 | list->size = 0; |
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322 | } |
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323 | |
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324 | static int cx_arl_swap( |
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325 | struct cx_list_s *list, |
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326 | size_t i, |
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327 | size_t j |
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328 | ) { |
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329 | if (i >= list->size || j >= list->size) return 1; |
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330 | cx_array_list *arl = (cx_array_list *) list; |
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331 | cx_array_swap(arl->data, list->item_size, i, j); |
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332 | return 0; |
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333 | } |
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334 | |
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335 | static void *cx_arl_at( |
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336 | struct cx_list_s const *list, |
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337 | size_t index |
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338 | ) { |
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339 | if (index < list->size) { |
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340 | cx_array_list const *arl = (cx_array_list const *) list; |
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341 | char *space = arl->data; |
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342 | return space + index * list->item_size; |
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343 | } else { |
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344 | return NULL; |
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345 | } |
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346 | } |
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347 | |
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348 | static ssize_t cx_arl_find( |
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349 | struct cx_list_s const *list, |
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350 | void const *elem |
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351 | ) { |
660 | 352 | assert(list->cmpfunc != NULL); |
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353 | assert(list->size < SIZE_MAX / 2); |
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354 | char *cur = ((cx_array_list const *) list)->data; |
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355 | |
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356 | for (ssize_t i = 0; i < (ssize_t) list->size; i++) { |
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357 | if (0 == list->cmpfunc(elem, cur)) { |
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358 | return i; |
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359 | } |
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360 | cur += list->item_size; |
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361 | } |
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362 | |
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363 | return -1; |
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364 | } |
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365 | |
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366 | static void cx_arl_sort(struct cx_list_s *list) { |
660 | 367 | assert(list->cmpfunc != NULL); |
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368 | qsort(((cx_array_list *) list)->data, |
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369 | list->size, |
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370 | list->item_size, |
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371 | list->cmpfunc |
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372 | ); |
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373 | } |
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374 | |
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375 | static int cx_arl_compare( |
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376 | struct cx_list_s const *list, |
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377 | struct cx_list_s const *other |
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378 | ) { |
660 | 379 | assert(list->cmpfunc != NULL); |
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380 | if (list->size == other->size) { |
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381 | char const *left = ((cx_array_list const *) list)->data; |
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382 | char const *right = ((cx_array_list const *) other)->data; |
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383 | for (size_t i = 0; i < list->size; i++) { |
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384 | int d = list->cmpfunc(left, right); |
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385 | if (d != 0) { |
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386 | return d; |
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387 | } |
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388 | left += list->item_size; |
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389 | right += other->item_size; |
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390 | } |
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391 | return 0; |
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392 | } else { |
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393 | return list->size < other->size ? -1 : 1; |
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394 | } |
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395 | } |
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396 | |
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397 | static void cx_arl_reverse(struct cx_list_s *list) { |
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398 | if (list->size < 2) return; |
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399 | void *data = ((cx_array_list const *) list)->data; |
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400 | size_t half = list->size / 2; |
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401 | for (size_t i = 0; i < half; i++) { |
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402 | cx_array_swap(data, list->item_size, i, list->size - 1 - i); |
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403 | } |
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404 | } |
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405 | |
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406 | static bool cx_arl_iter_valid(void const *it) { |
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407 | struct cx_iterator_s const *iter = it; |
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408 | struct cx_list_s const *list = iter->src_handle; |
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409 | return iter->index < list->size; |
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410 | } |
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411 | |
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412 | static void *cx_arl_iter_current(void const *it) { |
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413 | struct cx_iterator_s const *iter = it; |
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414 | return iter->elem_handle; |
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415 | } |
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416 | |
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417 | static void cx_arl_iter_next(void *it) { |
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418 | struct cx_iterator_base_s *itbase = it; |
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419 | if (itbase->remove) { |
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420 | struct cx_mut_iterator_s *iter = it; |
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421 | itbase->remove = false; |
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422 | cx_arl_remove(iter->src_handle, iter->index); |
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423 | } else { |
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424 | struct cx_iterator_s *iter = it; |
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425 | iter->index++; |
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426 | iter->elem_handle = |
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427 | ((char *) iter->elem_handle) |
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428 | + ((struct cx_list_s const *) iter->src_handle)->item_size; |
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429 | } |
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430 | } |
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431 | |
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432 | static void cx_arl_iter_prev(void *it) { |
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433 | struct cx_iterator_base_s *itbase = it; |
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434 | struct cx_mut_iterator_s *iter = it; |
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435 | cx_array_list *const list = iter->src_handle; |
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436 | if (itbase->remove) { |
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437 | itbase->remove = false; |
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438 | cx_arl_remove(iter->src_handle, iter->index); |
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439 | } |
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440 | iter->index--; |
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441 | if (iter->index < list->base.size) { |
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442 | iter->elem_handle = ((char *) list->data) |
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443 | + iter->index * list->base.item_size; |
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444 | } |
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445 | } |
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446 | |
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447 | static bool cx_arl_iter_flag_rm(void *it) { |
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448 | struct cx_iterator_base_s *iter = it; |
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449 | if (iter->mutating) { |
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450 | iter->remove = true; |
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451 | return true; |
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452 | } else { |
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453 | return false; |
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454 | } |
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455 | } |
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456 | |
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457 | static struct cx_iterator_s cx_arl_iterator( |
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458 | struct cx_list_s const *list, |
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459 | size_t index, |
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460 | bool backwards |
607
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461 | ) { |
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462 | struct cx_iterator_s iter; |
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463 | |
616
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464 | iter.index = index; |
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465 | iter.src_handle = list; |
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466 | iter.elem_handle = cx_arl_at(list, index); |
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467 | iter.base.valid = cx_arl_iter_valid; |
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468 | iter.base.current = cx_arl_iter_current; |
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469 | iter.base.next = backwards ? cx_arl_iter_prev : cx_arl_iter_next; |
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470 | iter.base.flag_removal = cx_arl_iter_flag_rm; |
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471 | iter.base.remove = false; |
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472 | iter.base.mutating = false; |
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473 | |
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474 | return iter; |
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475 | } |
616
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476 | |
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477 | static cx_list_class cx_array_list_class = { |
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478 | cx_arl_destructor, |
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479 | cx_arl_insert_element, |
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480 | cx_arl_insert_array, |
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481 | cx_arl_insert_iter, |
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482 | cx_arl_remove, |
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483 | cx_arl_clear, |
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484 | cx_arl_swap, |
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485 | cx_arl_at, |
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486 | cx_arl_find, |
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487 | cx_arl_sort, |
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488 | cx_arl_compare, |
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489 | cx_arl_reverse, |
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490 | cx_arl_iterator, |
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491 | }; |
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492 | |
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493 | CxList *cxArrayListCreate( |
606 | 494 | CxAllocator const *allocator, |
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495 | cx_compare_func comparator, |
606 | 496 | size_t item_size, |
497 | size_t initial_capacity | |
498 | ) { | |
670
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499 | if (allocator == NULL) { |
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500 | allocator = cxDefaultAllocator; |
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501 | } |
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502 | |
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503 | cx_array_list *list = cxCalloc(allocator, 1, sizeof(cx_array_list)); |
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504 | if (list == NULL) return NULL; |
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505 | |
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506 | list->base.cl = &cx_array_list_class; |
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507 | list->base.allocator = allocator; |
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508 | list->base.cmpfunc = comparator; |
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509 | list->capacity = initial_capacity; |
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510 | |
667
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511 | if (item_size > 0) { |
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512 | list->base.item_size = item_size; |
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513 | } else { |
678 | 514 | item_size = sizeof(void *); |
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515 | cxListStorePointers((CxList *) list); |
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516 | } |
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517 | |
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518 | // allocate the array after the real item_size is known |
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519 | list->data = cxCalloc(allocator, initial_capacity, item_size); |
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520 | if (list->data == NULL) { |
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521 | cxFree(allocator, list); |
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522 | return NULL; |
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523 | } |
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524 | |
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525 | // configure the reallocator |
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526 | list->reallocator.realloc = cx_arl_realloc; |
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527 | list->reallocator.ptr1 = (void *) allocator; |
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528 | |
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529 | return (CxList *) list; |
606 | 530 | } |