ucx/array_list.c

Sun, 09 Jun 2024 15:43:08 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sun, 09 Jun 2024 15:43:08 +0200
changeset 32
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child 49
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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 #include "cx/array_list.h"
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30 #include "cx/compare.h"
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31 #include <assert.h>
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32 #include <string.h>
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33
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34 // Default array reallocator
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35
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36 static void *cx_array_default_realloc(
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37 void *array,
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38 size_t capacity,
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39 size_t elem_size,
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40 __attribute__((__unused__)) struct cx_array_reallocator_s *alloc
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41 ) {
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42 return realloc(array, capacity * elem_size);
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43 }
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44
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45 struct cx_array_reallocator_s cx_array_default_reallocator_impl = {
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46 cx_array_default_realloc, NULL, NULL, 0, 0
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47 };
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48
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49 struct cx_array_reallocator_s *cx_array_default_reallocator = &cx_array_default_reallocator_impl;
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50
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51 // LOW LEVEL ARRAY LIST FUNCTIONS
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52
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53 enum cx_array_result cx_array_copy(
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54 void **target,
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55 size_t *size,
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56 size_t *capacity,
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57 size_t index,
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58 void const *src,
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59 size_t elem_size,
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60 size_t elem_count,
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61 struct cx_array_reallocator_s *reallocator
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62 ) {
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63 // assert pointers
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64 assert(target != NULL);
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65 assert(size != NULL);
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66 assert(src != NULL);
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67
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68 // determine capacity
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69 size_t cap = capacity == NULL ? *size : *capacity;
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70
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71 // check if resize is required
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72 size_t minsize = index + elem_count;
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73 size_t newsize = *size < minsize ? minsize : *size;
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74 bool needrealloc = newsize > cap;
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75
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76 // reallocate if possible
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77 if (needrealloc) {
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78 // a reallocator and a capacity variable must be available
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79 if (reallocator == NULL || capacity == NULL) {
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80 return CX_ARRAY_REALLOC_NOT_SUPPORTED;
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81 }
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82
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83 // check, if we need to repair the src pointer
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84 uintptr_t targetaddr = (uintptr_t) *target;
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85 uintptr_t srcaddr = (uintptr_t) src;
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86 bool repairsrc = targetaddr <= srcaddr
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87 && srcaddr < targetaddr + cap * elem_size;
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88
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89 // calculate new capacity (next number divisible by 16)
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90 cap = newsize - (newsize % 16) + 16;
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91 assert(cap > newsize);
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92
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93 // perform reallocation
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94 void *newmem = reallocator->realloc(
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95 *target, cap, elem_size, reallocator
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96 );
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97 if (newmem == NULL) {
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98 return CX_ARRAY_REALLOC_FAILED;
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99 }
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100
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101 // repair src pointer, if necessary
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102 if (repairsrc) {
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103 src = ((char *) newmem) + (srcaddr - targetaddr);
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104 }
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105
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106 // store new pointer and capacity
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107 *target = newmem;
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108 *capacity = cap;
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109 }
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110
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111 // determine target pointer
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112 char *start = *target;
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113 start += index * elem_size;
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114
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115 // copy elements and set new size
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116 memmove(start, src, elem_count * elem_size);
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117 *size = newsize;
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118
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119 // return successfully
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120 return CX_ARRAY_SUCCESS;
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121 }
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122
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123 #ifndef CX_ARRAY_SWAP_SBO_SIZE
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124 #define CX_ARRAY_SWAP_SBO_SIZE 128
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125 #endif
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126 unsigned cx_array_swap_sbo_size = CX_ARRAY_SWAP_SBO_SIZE;
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127
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128 void cx_array_swap(
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129 void *arr,
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130 size_t elem_size,
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131 size_t idx1,
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132 size_t idx2
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133 ) {
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134 assert(arr != NULL);
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135
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136 // short circuit
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137 if (idx1 == idx2) return;
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138
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139 char sbo_mem[CX_ARRAY_SWAP_SBO_SIZE];
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140 void *tmp;
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141
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142 // decide if we can use the local buffer
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143 if (elem_size > CX_ARRAY_SWAP_SBO_SIZE) {
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144 tmp = malloc(elem_size);
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145 // we don't want to enforce error handling
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146 if (tmp == NULL) abort();
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147 } else {
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148 tmp = sbo_mem;
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149 }
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150
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151 // calculate memory locations
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152 char *left = arr, *right = arr;
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153 left += idx1 * elem_size;
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154 right += idx2 * elem_size;
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155
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156 // three-way swap
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157 memcpy(tmp, left, elem_size);
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158 memcpy(left, right, elem_size);
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159 memcpy(right, tmp, elem_size);
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160
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161 // free dynamic memory, if it was needed
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162 if (tmp != sbo_mem) {
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163 free(tmp);
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164 }
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165 }
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166
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167 // HIGH LEVEL ARRAY LIST FUNCTIONS
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168
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169 typedef struct {
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170 struct cx_list_s base;
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171 void *data;
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172 size_t capacity;
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173 struct cx_array_reallocator_s reallocator;
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174 } cx_array_list;
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175
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176 static void *cx_arl_realloc(
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177 void *array,
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178 size_t capacity,
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179 size_t elem_size,
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180 struct cx_array_reallocator_s *alloc
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181 ) {
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182 // retrieve the pointer to the list allocator
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183 CxAllocator const *al = alloc->ptr1;
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184
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185 // use the list allocator to reallocate the memory
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186 return cxRealloc(al, array, capacity * elem_size);
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187 }
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188
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189 static void cx_arl_destructor(struct cx_list_s *list) {
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190 cx_array_list *arl = (cx_array_list *) list;
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191
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192 char *ptr = arl->data;
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193
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194 if (list->simple_destructor) {
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195 for (size_t i = 0; i < list->size; i++) {
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196 cx_invoke_simple_destructor(list, ptr);
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197 ptr += list->item_size;
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198 }
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199 }
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200 if (list->advanced_destructor) {
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201 for (size_t i = 0; i < list->size; i++) {
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202 cx_invoke_advanced_destructor(list, ptr);
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203 ptr += list->item_size;
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204 }
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205 }
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206
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207 cxFree(list->allocator, arl->data);
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208 cxFree(list->allocator, list);
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209 }
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210
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211 static size_t cx_arl_insert_array(
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212 struct cx_list_s *list,
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213 size_t index,
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214 void const *array,
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215 size_t n
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216 ) {
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217 // out of bounds and special case check
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218 if (index > list->size || n == 0) return 0;
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219
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220 // get a correctly typed pointer to the list
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221 cx_array_list *arl = (cx_array_list *) list;
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222
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223 // do we need to move some elements?
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224 if (index < list->size) {
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225 char const *first_to_move = (char const *) arl->data;
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226 first_to_move += index * list->item_size;
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227 size_t elems_to_move = list->size - index;
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228 size_t start_of_moved = index + n;
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229
2
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230 if (CX_ARRAY_SUCCESS != cx_array_copy(
0
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231 &arl->data,
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232 &list->size,
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233 &arl->capacity,
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234 start_of_moved,
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235 first_to_move,
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236 list->item_size,
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237 elems_to_move,
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238 &arl->reallocator
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239 )) {
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240 // if moving existing elems is unsuccessful, abort
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241 return 0;
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242 }
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243 }
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244
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245 // note that if we had to move the elements, the following operation
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246 // is guaranteed to succeed, because we have the memory already allocated
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247 // therefore, it is impossible to leave this function with an invalid array
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248
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249 // place the new elements
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250 if (CX_ARRAY_SUCCESS == cx_array_copy(
0
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251 &arl->data,
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252 &list->size,
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253 &arl->capacity,
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254 index,
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255 array,
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256 list->item_size,
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257 n,
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258 &arl->reallocator
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259 )) {
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260 return n;
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261 } else {
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262 // array list implementation is "all or nothing"
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263 return 0;
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264 }
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265 }
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266
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267 static int cx_arl_insert_element(
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268 struct cx_list_s *list,
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269 size_t index,
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270 void const *element
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271 ) {
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272 return 1 != cx_arl_insert_array(list, index, element, 1);
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273 }
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274
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275 static int cx_arl_insert_iter(
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276 struct cx_mut_iterator_s *iter,
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277 void const *elem,
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278 int prepend
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279 ) {
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280 struct cx_list_s *list = iter->src_handle;
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281 if (iter->index < list->size) {
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282 int result = cx_arl_insert_element(
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283 list,
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284 iter->index + 1 - prepend,
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285 elem
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286 );
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287 if (result == 0 && prepend != 0) {
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288 iter->index++;
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289 iter->elem_handle = ((char *) iter->elem_handle) + list->item_size;
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290 }
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291 return result;
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292 } else {
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293 int result = cx_arl_insert_element(list, list->size, elem);
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294 iter->index = list->size;
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295 return result;
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296 }
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297 }
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298
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299 static int cx_arl_remove(
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300 struct cx_list_s *list,
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301 size_t index
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302 ) {
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303 cx_array_list *arl = (cx_array_list *) list;
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304
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305 // out-of-bounds check
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306 if (index >= list->size) {
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307 return 1;
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308 }
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309
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310 // content destruction
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311 cx_invoke_destructor(list, ((char *) arl->data) + index * list->item_size);
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312
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313 // short-circuit removal of last element
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314 if (index == list->size - 1) {
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315 list->size--;
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316 return 0;
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317 }
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318
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319 // just move the elements starting at index to the left
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320 int result = cx_array_copy(
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321 &arl->data,
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322 &list->size,
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323 &arl->capacity,
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324 index,
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325 ((char *) arl->data) + (index + 1) * list->item_size,
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326 list->item_size,
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327 list->size - index - 1,
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328 &arl->reallocator
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329 );
2
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330
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331 // cx_array_copy cannot fail, array cannot grow
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332 assert(result == 0);
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333
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334 // decrease the size
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335 list->size--;
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336
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337 return 0;
0
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338 }
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339
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340 static void cx_arl_clear(struct cx_list_s *list) {
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341 if (list->size == 0) return;
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342
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343 cx_array_list *arl = (cx_array_list *) list;
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344 char *ptr = arl->data;
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345
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346 if (list->simple_destructor) {
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347 for (size_t i = 0; i < list->size; i++) {
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348 cx_invoke_simple_destructor(list, ptr);
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349 ptr += list->item_size;
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350 }
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351 }
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352 if (list->advanced_destructor) {
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353 for (size_t i = 0; i < list->size; i++) {
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354 cx_invoke_advanced_destructor(list, ptr);
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355 ptr += list->item_size;
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356 }
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357 }
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358
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359 memset(arl->data, 0, list->size * list->item_size);
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360 list->size = 0;
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361 }
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362
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363 static int cx_arl_swap(
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364 struct cx_list_s *list,
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365 size_t i,
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366 size_t j
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367 ) {
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368 if (i >= list->size || j >= list->size) return 1;
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369 cx_array_list *arl = (cx_array_list *) list;
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370 cx_array_swap(arl->data, list->item_size, i, j);
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371 return 0;
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parents:
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372 }
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373
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374 static void *cx_arl_at(
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375 struct cx_list_s const *list,
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376 size_t index
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377 ) {
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378 if (index < list->size) {
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379 cx_array_list const *arl = (cx_array_list const *) list;
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380 char *space = arl->data;
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381 return space + index * list->item_size;
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382 } else {
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383 return NULL;
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parents:
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384 }
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parents:
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385 }
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386
2
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parents: 0
diff changeset
387 static ssize_t cx_arl_find_remove(
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388 struct cx_list_s *list,
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389 void const *elem,
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diff changeset
390 bool remove
0
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391 ) {
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392 assert(list->cmpfunc != NULL);
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parents:
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393 assert(list->size < SIZE_MAX / 2);
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parents:
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394 char *cur = ((cx_array_list const *) list)->data;
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parents:
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395
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parents:
diff changeset
396 for (ssize_t i = 0; i < (ssize_t) list->size; i++) {
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parents:
diff changeset
397 if (0 == list->cmpfunc(elem, cur)) {
2
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parents: 0
diff changeset
398 if (remove) {
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parents: 0
diff changeset
399 if (0 == cx_arl_remove(list, i)) {
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parents: 0
diff changeset
400 return i;
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parents: 0
diff changeset
401 } else {
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parents: 0
diff changeset
402 return -1;
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parents: 0
diff changeset
403 }
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parents: 0
diff changeset
404 } else {
fbdfaacc4182 update ucx, libidav and add first gui code
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parents: 0
diff changeset
405 return i;
fbdfaacc4182 update ucx, libidav and add first gui code
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parents: 0
diff changeset
406 }
0
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parents:
diff changeset
407 }
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parents:
diff changeset
408 cur += list->item_size;
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parents:
diff changeset
409 }
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parents:
diff changeset
410
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parents:
diff changeset
411 return -1;
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parents:
diff changeset
412 }
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parents:
diff changeset
413
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parents:
diff changeset
414 static void cx_arl_sort(struct cx_list_s *list) {
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parents:
diff changeset
415 assert(list->cmpfunc != NULL);
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parents:
diff changeset
416 qsort(((cx_array_list *) list)->data,
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parents:
diff changeset
417 list->size,
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parents:
diff changeset
418 list->item_size,
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parents:
diff changeset
419 list->cmpfunc
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parents:
diff changeset
420 );
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parents:
diff changeset
421 }
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parents:
diff changeset
422
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parents:
diff changeset
423 static int cx_arl_compare(
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parents:
diff changeset
424 struct cx_list_s const *list,
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parents:
diff changeset
425 struct cx_list_s const *other
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parents:
diff changeset
426 ) {
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parents:
diff changeset
427 assert(list->cmpfunc != NULL);
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parents:
diff changeset
428 if (list->size == other->size) {
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parents:
diff changeset
429 char const *left = ((cx_array_list const *) list)->data;
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parents:
diff changeset
430 char const *right = ((cx_array_list const *) other)->data;
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parents:
diff changeset
431 for (size_t i = 0; i < list->size; i++) {
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parents:
diff changeset
432 int d = list->cmpfunc(left, right);
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parents:
diff changeset
433 if (d != 0) {
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parents:
diff changeset
434 return d;
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parents:
diff changeset
435 }
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parents:
diff changeset
436 left += list->item_size;
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parents:
diff changeset
437 right += other->item_size;
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parents:
diff changeset
438 }
2483f517c562 add existing toolkit code
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parents:
diff changeset
439 return 0;
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
440 } else {
2483f517c562 add existing toolkit code
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parents:
diff changeset
441 return list->size < other->size ? -1 : 1;
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parents:
diff changeset
442 }
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parents:
diff changeset
443 }
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parents:
diff changeset
444
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parents:
diff changeset
445 static void cx_arl_reverse(struct cx_list_s *list) {
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parents:
diff changeset
446 if (list->size < 2) return;
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parents:
diff changeset
447 void *data = ((cx_array_list const *) list)->data;
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parents:
diff changeset
448 size_t half = list->size / 2;
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parents:
diff changeset
449 for (size_t i = 0; i < half; i++) {
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
450 cx_array_swap(data, list->item_size, i, list->size - 1 - i);
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
451 }
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
452 }
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
453
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parents:
diff changeset
454 static bool cx_arl_iter_valid(void const *it) {
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parents:
diff changeset
455 struct cx_iterator_s const *iter = it;
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parents:
diff changeset
456 struct cx_list_s const *list = iter->src_handle;
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parents:
diff changeset
457 return iter->index < list->size;
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
458 }
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
459
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
460 static void *cx_arl_iter_current(void const *it) {
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parents:
diff changeset
461 struct cx_iterator_s const *iter = it;
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parents:
diff changeset
462 return iter->elem_handle;
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
463 }
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
464
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parents:
diff changeset
465 static void cx_arl_iter_next(void *it) {
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parents:
diff changeset
466 struct cx_iterator_base_s *itbase = it;
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parents:
diff changeset
467 if (itbase->remove) {
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parents:
diff changeset
468 struct cx_mut_iterator_s *iter = it;
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parents:
diff changeset
469 itbase->remove = false;
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parents:
diff changeset
470 cx_arl_remove(iter->src_handle, iter->index);
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parents:
diff changeset
471 } else {
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parents:
diff changeset
472 struct cx_iterator_s *iter = it;
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parents:
diff changeset
473 iter->index++;
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parents:
diff changeset
474 iter->elem_handle =
2483f517c562 add existing toolkit code
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parents:
diff changeset
475 ((char *) iter->elem_handle)
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
476 + ((struct cx_list_s const *) iter->src_handle)->item_size;
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
477 }
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
478 }
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479
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480 static void cx_arl_iter_prev(void *it) {
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481 struct cx_iterator_base_s *itbase = it;
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482 struct cx_mut_iterator_s *iter = it;
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483 cx_array_list *const list = iter->src_handle;
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484 if (itbase->remove) {
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485 itbase->remove = false;
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486 cx_arl_remove(iter->src_handle, iter->index);
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487 }
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488 iter->index--;
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489 if (iter->index < list->base.size) {
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490 iter->elem_handle = ((char *) list->data)
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491 + iter->index * list->base.item_size;
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492 }
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493 }
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494
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495 static bool cx_arl_iter_flag_rm(void *it) {
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496 struct cx_iterator_base_s *iter = it;
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497 if (iter->mutating) {
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498 iter->remove = true;
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499 return true;
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500 } else {
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501 return false;
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502 }
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503 }
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504
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505 static struct cx_iterator_s cx_arl_iterator(
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506 struct cx_list_s const *list,
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507 size_t index,
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508 bool backwards
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509 ) {
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510 struct cx_iterator_s iter;
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511
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512 iter.index = index;
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513 iter.src_handle = list;
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514 iter.elem_handle = cx_arl_at(list, index);
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515 iter.base.valid = cx_arl_iter_valid;
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516 iter.base.current = cx_arl_iter_current;
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517 iter.base.next = backwards ? cx_arl_iter_prev : cx_arl_iter_next;
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518 iter.base.flag_removal = cx_arl_iter_flag_rm;
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519 iter.base.remove = false;
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520 iter.base.mutating = false;
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521
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522 return iter;
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523 }
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524
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525 static cx_list_class cx_array_list_class = {
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526 cx_arl_destructor,
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527 cx_arl_insert_element,
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528 cx_arl_insert_array,
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529 cx_arl_insert_iter,
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530 cx_arl_remove,
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531 cx_arl_clear,
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532 cx_arl_swap,
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533 cx_arl_at,
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534 cx_arl_find_remove,
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535 cx_arl_sort,
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536 cx_arl_compare,
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537 cx_arl_reverse,
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538 cx_arl_iterator,
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539 };
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540
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541 CxList *cxArrayListCreate(
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542 CxAllocator const *allocator,
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543 cx_compare_func comparator,
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544 size_t item_size,
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545 size_t initial_capacity
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546 ) {
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547 if (allocator == NULL) {
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548 allocator = cxDefaultAllocator;
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549 }
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550
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551 cx_array_list *list = cxCalloc(allocator, 1, sizeof(cx_array_list));
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552 if (list == NULL) return NULL;
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553
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554 list->base.cl = &cx_array_list_class;
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555 list->base.allocator = allocator;
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556 list->capacity = initial_capacity;
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557
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558 if (item_size > 0) {
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559 list->base.item_size = item_size;
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560 list->base.cmpfunc = comparator;
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561 } else {
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562 item_size = sizeof(void *);
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563 list->base.cmpfunc = comparator == NULL ? cx_cmp_ptr : comparator;
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564 cxListStorePointers((CxList *) list);
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565 }
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566
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567 // allocate the array after the real item_size is known
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568 list->data = cxCalloc(allocator, initial_capacity, item_size);
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569 if (list->data == NULL) {
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570 cxFree(allocator, list);
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571 return NULL;
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572 }
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573
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574 // configure the reallocator
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575 list->reallocator.realloc = cx_arl_realloc;
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576 list->reallocator.ptr1 = (void *) allocator;
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577
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578 return (CxList *) list;
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579 }

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