src/array_list.c

Sun, 20 Nov 2022 15:51:02 +0100

author
Mike Becker <universe@uap-core.de>
date
Sun, 20 Nov 2022 15:51:02 +0100
changeset 618
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parent 616
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child 619
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permissions
-rw-r--r--

#219 array list: implement compare

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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 <assert.h>
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31 #include <string.h>
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32 #include <stdint.h>
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33
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34 /* LOW LEVEL ARRAY LIST FUNCTIONS */
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35
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36 enum cx_array_copy_result cx_array_copy(
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37 void **target,
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38 size_t *size,
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39 size_t *capacity,
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40 size_t index,
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41 void const *src,
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42 size_t elem_size,
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43 size_t elem_count,
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44 struct cx_array_reallocator_s *reallocator
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45 ) {
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46 /* assert pointers */
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47 assert(target != NULL);
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48 assert(size != NULL);
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49 assert(src != NULL);
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50
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51 /* determine capacity */
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52 size_t cap = capacity == NULL ? *size : *capacity;
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53
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54 /* check if resize is required */
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55 size_t newsize = index + elem_count;
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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 /* increase capacity linearly */
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72 cap += 16;
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73
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74 /* perform reallocation */
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75 void *newmem = reallocator->realloc(
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76 *target, cap, elem_size, reallocator
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77 );
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78 if (newmem == NULL) {
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79 return CX_ARRAY_COPY_REALLOC_FAILED;
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80 }
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81
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82 /* repair src pointer, if necessary */
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83 if (repairsrc) {
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84 src = ((char *) newmem) + (srcaddr - targetaddr);
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85 }
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86
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87 /* store new pointer and capacity */
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88 *target = newmem;
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89 *capacity = cap;
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90 }
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91
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92 /* determine target pointer */
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93 char *start = *target;
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94 start += index * elem_size;
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95
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96 /* copy elements and set new size */
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97 memmove(start, src, elem_count * elem_size);
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98 *size = newsize;
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99
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100 /* return successfully */
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101 return CX_ARRAY_COPY_SUCCESS;
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102 }
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103
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104 /* HIGH LEVEL ARRAY LIST FUNCTIONS */
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105
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106 typedef struct {
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107 struct cx_list_s base;
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108 void *data;
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109 struct cx_array_reallocator_s reallocator;
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110 } cx_array_list;
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111
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112 static void *cx_arl_realloc(
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113 void *array,
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114 size_t capacity,
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115 size_t elem_size,
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116 struct cx_array_reallocator_s *alloc
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117 ) {
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118 /* retrieve the pointer to the list allocator */
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119 CxAllocator const *al = alloc->ptr1;
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120
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121 /* use the list allocator to reallocate the memory */
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122 return cxRealloc(al, array, capacity * elem_size);
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123 }
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124
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125 static void cx_arl_destructor(struct cx_list_s *list) {
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126 cx_array_list *arl = (cx_array_list *) list;
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127 cxFree(list->allocator, arl->data);
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128 }
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129
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130 static int cx_arl_add(
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131 struct cx_list_s *list,
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132 void const *elem
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133 ) {
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134 cx_array_list *arl = (cx_array_list *) list;
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135 return cx_array_copy(
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136 &arl->data,
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137 &list->size,
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138 &list->capacity,
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139 list->size,
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140 elem,
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141 list->itemsize,
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142 1,
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143 &arl->reallocator
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144 );
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145 }
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146
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147 static int cx_arl_insert(
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148 struct cx_list_s *list,
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149 size_t index,
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150 void const *elem
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151 ) {
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152 if (index > list->size) {
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153 return 1;
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154 } else if (index == list->size) {
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155 return cx_arl_add(list, elem);
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156 } else {
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157 cx_array_list *arl = (cx_array_list *) list;
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158
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159 /* move elements starting at index to the right */
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160 if (cx_array_copy(
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161 &arl->data,
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162 &list->size,
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163 &list->capacity,
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164 index + 1,
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165 ((char *) arl->data) + index * list->itemsize,
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166 list->itemsize,
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167 list->size - index,
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168 &arl->reallocator
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169 )) {
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170 return 1;
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171 }
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172
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173 /* place the element */
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174 memcpy(((char *) arl->data) + index * list->itemsize,
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175 elem, list->itemsize);
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176
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177 return 0;
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178 }
607
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179 }
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180
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181 static int cx_arl_insert_iter(
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182 struct cx_iterator_s *iter,
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183 void const *elem,
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184 int prepend
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185 ) {
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186 return 1;
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187 }
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188
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189 static int cx_arl_remove(
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190 struct cx_list_s *list,
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191 size_t index
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192 ) {
613
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193 /* out-of-bounds check */
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194 if (index >= list->size) {
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195 return 1;
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196 }
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197
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198 cx_array_list *arl = (cx_array_list *) list;
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199
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200 /* just move the elements starting at index to the left */
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201 int result = cx_array_copy(
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202 &arl->data,
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203 &list->size,
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204 &list->capacity,
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205 index,
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206 ((char *) arl->data) + (index + 1) * list->itemsize,
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207 list->itemsize,
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208 list->size - index,
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209 &arl->reallocator
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210 );
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211 if (result == 0) {
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212 /* decrease the size */
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213 list->size--;
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214 }
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215 return result;
607
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216 }
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217
610
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218 static void *cx_arl_at(
607
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219 struct cx_list_s const *list,
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220 size_t index
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221 ) {
610
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222 if (index < list->size) {
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223 cx_array_list const *arl = (cx_array_list const *) list;
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224 char *space = arl->data;
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225 return space + index * list->itemsize;
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226 } else {
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227 return NULL;
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228 }
607
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229 }
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230
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231 static size_t cx_arl_find(
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232 struct cx_list_s const *list,
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233 void const *elem
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234 ) {
614
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235 char *cur = ((cx_array_list const *) list)->data;
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236
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237 for (size_t i = 0; i < list->size; i++) {
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238 if (0 == list->cmpfunc(elem, cur)) {
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239 return i;
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parents: 613
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240 }
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241 cur += list->itemsize;
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242 }
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243
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244 return list->size;
607
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245 }
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246
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247 static void cx_arl_sort(struct cx_list_s *list) {
615
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parents: 614
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248 qsort(((cx_array_list *) list)->data,
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parents: 614
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249 list->size,
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parents: 614
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250 list->itemsize,
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parents: 614
diff changeset
251 list->cmpfunc
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diff changeset
252 );
607
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253 }
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254
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diff changeset
255 static int cx_arl_compare(
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diff changeset
256 struct cx_list_s const *list,
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diff changeset
257 struct cx_list_s const *other
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258 ) {
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parents: 606
diff changeset
259
2d99e978dc34 implement array list ctor and dtor
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260 }
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261
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diff changeset
262 static void cx_arl_reverse(struct cx_list_s *list) {
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diff changeset
263
2d99e978dc34 implement array list ctor and dtor
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parents: 606
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264 }
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265
616
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266 static bool cx_arl_iter_valid(struct cx_iterator_s const *iter) {
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267 struct cx_list_s const *list = iter->src_handle;
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268 return iter->index < list->size;
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269 }
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270
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271 static void *cx_arl_iter_current(struct cx_iterator_s const *iter) {
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272 return iter->elem_handle;
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273 }
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274
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275 static void cx_arl_iter_next(struct cx_iterator_s *iter) {
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diff changeset
276 if (iter->remove) {
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277 iter->remove = false;
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278 cx_arl_remove(iter->src_handle, iter->index);
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279 } else {
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280 iter->index++;
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281 iter->elem_handle = cx_arl_at(iter->src_handle, iter->index);
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282 }
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283 }
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284
607
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285 static struct cx_iterator_s cx_arl_iterator(
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286 struct cx_list_s *list,
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287 size_t index
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288 ) {
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289 struct cx_iterator_s iter;
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290
616
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291 iter.index = index;
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292 iter.src_handle = list;
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293 iter.elem_handle = cx_arl_at(list, index);
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294 iter.valid = cx_arl_iter_valid;
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295 iter.current = cx_arl_iter_current;
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296 iter.next = cx_arl_iter_next;
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297 iter.remove = false;
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298
607
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299 return iter;
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300 }
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301
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diff changeset
302 static cx_list_class cx_array_list_class = {
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303 cx_arl_destructor,
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304 cx_arl_add,
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305 cx_arl_insert,
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306 cx_arl_insert_iter,
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307 cx_arl_remove,
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diff changeset
308 cx_arl_at,
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diff changeset
309 cx_arl_find,
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310 cx_arl_sort,
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311 cx_arl_compare,
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312 cx_arl_reverse,
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diff changeset
313 cx_arl_iterator,
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314 };
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315
606
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316 CxList *cxArrayListCreate(
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317 CxAllocator const *allocator,
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318 CxListComparator comparator,
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319 size_t item_size,
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320 size_t initial_capacity
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321 ) {
607
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322 cx_array_list *list = cxCalloc(allocator, 1, sizeof(cx_array_list));
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323 if (list == NULL) return NULL;
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324
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325 list->data = cxCalloc(allocator, initial_capacity, item_size);
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326 if (list->data == NULL) {
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327 cxFree(allocator, list);
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328 return NULL;
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329 }
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330
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331 list->base.cl = &cx_array_list_class;
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332 list->base.allocator = allocator;
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333 list->base.cmpfunc = comparator;
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334 list->base.itemsize = item_size;
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335 list->base.capacity = initial_capacity;
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336
610
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337 /* configure the reallocator */
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338 list->reallocator.realloc = cx_arl_realloc;
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339 list->reallocator.ptr1 = (void *) allocator;
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340
607
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341 return (CxList *) list;
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342 }

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