src/list.c

Sat, 19 Oct 2024 13:21:58 +0200

author
Mike Becker <universe@uap-core.de>
date
Sat, 19 Oct 2024 13:21:58 +0200
changeset 931
be71809e69d1
parent 919
75da57d4634e
permissions
-rw-r--r--

add test coverage for unlinking tree nodes w/o prev pointer

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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/list.h"
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30
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31 #include <string.h>
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32
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33 // <editor-fold desc="Store Pointers Functionality">
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34
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35 static _Thread_local cx_compare_func cx_pl_cmpfunc_impl;
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36
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37 static int cx_pl_cmpfunc(
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38 const void *l,
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39 const void *r
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40 ) {
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41 void *const *lptr = l;
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42 void *const *rptr = r;
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43 const void *left = lptr == NULL ? NULL : *lptr;
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44 const void *right = rptr == NULL ? NULL : *rptr;
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45 return cx_pl_cmpfunc_impl(left, right);
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46 }
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47
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48 static void cx_pl_hack_cmpfunc(const struct cx_list_s *list) {
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49 // cast away const - this is the hacky thing
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50 struct cx_collection_s *l = (struct cx_collection_s*) &list->collection;
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51 cx_pl_cmpfunc_impl = l->cmpfunc;
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52 l->cmpfunc = cx_pl_cmpfunc;
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53 }
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54
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55 static void cx_pl_unhack_cmpfunc(const struct cx_list_s *list) {
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56 // cast away const - this is the hacky thing
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57 struct cx_collection_s *l = (struct cx_collection_s*) &list->collection;
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58 l->cmpfunc = cx_pl_cmpfunc_impl;
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59 }
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60
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61 static void cx_pl_destructor(struct cx_list_s *list) {
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62 list->climpl->destructor(list);
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63 }
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64
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65 static int cx_pl_insert_element(
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66 struct cx_list_s *list,
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67 size_t index,
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68 const void *element
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69 ) {
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70 return list->climpl->insert_element(list, index, &element);
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71 }
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72
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73 static size_t cx_pl_insert_array(
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74 struct cx_list_s *list,
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75 size_t index,
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76 const void *array,
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77 size_t n
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78 ) {
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79 return list->climpl->insert_array(list, index, array, n);
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80 }
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81
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82 static size_t cx_pl_insert_sorted(
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83 struct cx_list_s *list,
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84 const void *array,
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85 size_t n
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86 ) {
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87 cx_pl_hack_cmpfunc(list);
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88 size_t result = list->climpl->insert_sorted(list, array, n);
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89 cx_pl_unhack_cmpfunc(list);
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90 return result;
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91 }
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92
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93 static int cx_pl_insert_iter(
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94 struct cx_iterator_s *iter,
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95 const void *elem,
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96 int prepend
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97 ) {
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98 struct cx_list_s *list = iter->src_handle.m;
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99 return list->climpl->insert_iter(iter, &elem, prepend);
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100 }
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101
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102 static size_t cx_pl_remove(
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103 struct cx_list_s *list,
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104 size_t index,
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105 size_t num,
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106 void *targetbuf
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107 ) {
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108 return list->climpl->remove(list, index, num, targetbuf);
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109 }
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110
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111 static void cx_pl_clear(struct cx_list_s *list) {
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112 list->climpl->clear(list);
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113 }
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114
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115 static int cx_pl_swap(
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116 struct cx_list_s *list,
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117 size_t i,
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118 size_t j
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119 ) {
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120 return list->climpl->swap(list, i, j);
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121 }
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122
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123 static void *cx_pl_at(
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124 const struct cx_list_s *list,
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125 size_t index
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126 ) {
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127 void **ptr = list->climpl->at(list, index);
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128 return ptr == NULL ? NULL : *ptr;
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129 }
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130
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131 static ssize_t cx_pl_find_remove(
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132 struct cx_list_s *list,
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133 const void *elem,
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134 bool remove
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135 ) {
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136 cx_pl_hack_cmpfunc(list);
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137 ssize_t ret = list->climpl->find_remove(list, &elem, remove);
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138 cx_pl_unhack_cmpfunc(list);
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139 return ret;
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140 }
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141
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142 static void cx_pl_sort(struct cx_list_s *list) {
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143 cx_pl_hack_cmpfunc(list);
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144 list->climpl->sort(list);
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145 cx_pl_unhack_cmpfunc(list);
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146 }
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147
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148 static int cx_pl_compare(
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149 const struct cx_list_s *list,
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150 const struct cx_list_s *other
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151 ) {
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152 cx_pl_hack_cmpfunc(list);
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153 int ret = list->climpl->compare(list, other);
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154 cx_pl_unhack_cmpfunc(list);
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155 return ret;
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156 }
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157
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158 static void cx_pl_reverse(struct cx_list_s *list) {
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159 list->climpl->reverse(list);
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160 }
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161
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162 static void *cx_pl_iter_current(const void *it) {
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163 const struct cx_iterator_s *iter = it;
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164 void **ptr = iter->base.current_impl(it);
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165 return ptr == NULL ? NULL : *ptr;
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166 }
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167
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168 static struct cx_iterator_s cx_pl_iterator(
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169 const struct cx_list_s *list,
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170 size_t index,
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171 bool backwards
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172 ) {
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173 struct cx_iterator_s iter = list->climpl->iterator(list, index, backwards);
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174 iter.base.current_impl = iter.base.current;
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175 iter.base.current = cx_pl_iter_current;
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176 return iter;
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177 }
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178
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179 static cx_list_class cx_pointer_list_class = {
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180 cx_pl_destructor,
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181 cx_pl_insert_element,
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182 cx_pl_insert_array,
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183 cx_pl_insert_sorted,
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184 cx_pl_insert_iter,
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185 cx_pl_remove,
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186 cx_pl_clear,
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187 cx_pl_swap,
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188 cx_pl_at,
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189 cx_pl_find_remove,
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190 cx_pl_sort,
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191 cx_pl_compare,
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192 cx_pl_reverse,
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193 cx_pl_iterator,
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194 };
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195
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196 void cxListStoreObjects(CxList *list) {
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197 list->collection.store_pointer = false;
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198 if (list->climpl != NULL) {
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199 list->cl = list->climpl;
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200 list->climpl = NULL;
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201 }
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202 }
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203
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204 void cxListStorePointers(CxList *list) {
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205 list->collection.elem_size = sizeof(void *);
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206 list->collection.store_pointer = true;
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207 list->climpl = list->cl;
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208 list->cl = &cx_pointer_list_class;
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209 }
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210
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211 // </editor-fold>
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212
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213 // <editor-fold desc="empty list implementation">
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214
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215 static void cx_emptyl_noop(__attribute__((__unused__)) CxList *list) {
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216 // this is a noop, but MUST be implemented
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217 }
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218
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219 static void *cx_emptyl_at(
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220 __attribute__((__unused__)) const struct cx_list_s *list,
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221 __attribute__((__unused__)) size_t index
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222 ) {
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223 return NULL;
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224 }
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225
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226 static ssize_t cx_emptyl_find_remove(
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227 __attribute__((__unused__)) struct cx_list_s *list,
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228 __attribute__((__unused__)) const void *elem,
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229 __attribute__((__unused__)) bool remove
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230 ) {
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231 return -1;
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232 }
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233
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234 static bool cx_emptyl_iter_valid(__attribute__((__unused__)) const void *iter) {
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235 return false;
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236 }
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237
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238 static CxIterator cx_emptyl_iterator(
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239 const struct cx_list_s *list,
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240 size_t index,
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241 __attribute__((__unused__)) bool backwards
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242 ) {
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243 CxIterator iter = {0};
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244 iter.src_handle.c = list;
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245 iter.index = index;
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246 iter.base.valid = cx_emptyl_iter_valid;
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247 return iter;
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248 }
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249
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250 static cx_list_class cx_empty_list_class = {
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251 cx_emptyl_noop,
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252 NULL,
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253 NULL,
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254 NULL,
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255 NULL,
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256 NULL,
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257 cx_emptyl_noop,
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258 NULL,
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259 cx_emptyl_at,
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260 cx_emptyl_find_remove,
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261 cx_emptyl_noop,
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262 NULL,
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263 cx_emptyl_noop,
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264 cx_emptyl_iterator,
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265 };
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266
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267 CxList cx_empty_list = {
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268 {
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269 NULL,
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270 NULL,
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271 0,
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272 0,
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273 NULL,
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274 NULL,
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275 NULL,
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276 false
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277 },
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278 &cx_empty_list_class,
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279 NULL
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280 };
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281
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282 CxList *const cxEmptyList = &cx_empty_list;
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283
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284 // </editor-fold>
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285
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286 #define invoke_list_func(name, list, ...) \
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287 ((list)->climpl == NULL ? (list)->cl->name : (list)->climpl->name) \
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288 (list, __VA_ARGS__)
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289
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290 size_t cx_list_default_insert_array(
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291 struct cx_list_s *list,
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292 size_t index,
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293 const void *data,
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294 size_t n
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295 ) {
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296 size_t elem_size = list->collection.elem_size;
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297 const char *src = data;
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298 size_t i = 0;
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299 for (; i < n; i++) {
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300 if (0 != invoke_list_func(insert_element,
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301 list, index + i, src + (i * elem_size))) {
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302 return i;
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303 }
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304 }
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305 return i;
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306 }
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307
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308 size_t cx_list_default_insert_sorted(
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309 struct cx_list_s *list,
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310 const void *sorted_data,
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311 size_t n
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312 ) {
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313 // corner case
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314 if (n == 0) return 0;
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315
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316 size_t elem_size = list->collection.elem_size;
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317 cx_compare_func cmp = list->collection.cmpfunc;
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318 const char *src = sorted_data;
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319
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320 // track indices and number of inserted items
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321 size_t di = 0, si = 0, inserted = 0;
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322
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323 // search the list for insertion points
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324 for (; di < list->collection.size; di++) {
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325 const void *list_elm = invoke_list_func(at, list, di);
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326
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327 // compare current list element with first source element
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328 // if less or equal, skip
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329 if (cmp(list_elm, src) <= 0) {
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330 continue;
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331 }
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332
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333 // determine number of consecutive elements that can be inserted
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334 size_t ins = 1;
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335 const char *next = src;
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336 while (++si < n) {
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337 next += elem_size;
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338 // once we become larger than the list elem, break
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339 if (cmp(list_elm, next) <= 0) {
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340 break;
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341 }
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342 // otherwise, we can insert one more
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343 ins++;
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344 }
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345
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346 // insert the elements at location si
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347 if (ins == 1) {
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348 if (0 != invoke_list_func(insert_element,
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349 list, di, src))
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350 return inserted;
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351 } else {
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352 size_t r = invoke_list_func(insert_array, list, di, src, ins);
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353 if (r < ins) return inserted + r;
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354 }
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355 inserted += ins;
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356 di += ins;
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357
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358 // everything inserted?
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359 if (inserted == n) return inserted;
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360 src = next;
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361 }
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362
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363 // insert remaining items
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364 if (si < n) {
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365 inserted += invoke_list_func(insert_array, list, di, src, n - si);
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366 }
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367
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368 return inserted;
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369 }
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370
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371 void cx_list_default_sort(struct cx_list_s *list) {
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372 size_t elem_size = list->collection.elem_size;
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373 size_t list_size = list->collection.size;
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374 void *tmp = malloc(elem_size * list_size);
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375 if (tmp == NULL) abort();
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376
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377 // copy elements from source array
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378 char *loc = tmp;
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379 for (size_t i = 0; i < list_size; i++) {
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380 void *src = invoke_list_func(at, list, i);
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381 memcpy(loc, src, elem_size);
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382 loc += elem_size;
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383 }
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384
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385 // qsort
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386 qsort(tmp, list_size, elem_size,
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387 list->collection.cmpfunc);
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388
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389 // copy elements back
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390 loc = tmp;
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391 for (size_t i = 0; i < list_size; i++) {
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392 void *dest = invoke_list_func(at, list, i);
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393 memcpy(dest, loc, elem_size);
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394 loc += elem_size;
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395 }
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396
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397 free(tmp);
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398 }
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399
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400 int cx_list_default_swap(struct cx_list_s *list, size_t i, size_t j) {
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401 if (i == j) return 0;
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402 if (i >= list->collection.size) return 1;
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403 if (j >= list->collection.size) return 1;
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404
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405 size_t elem_size = list->collection.elem_size;
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406
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407 void *tmp = malloc(elem_size);
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408 if (tmp == NULL) return 1;
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409
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410 void *ip = invoke_list_func(at, list, i);
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411 void *jp = invoke_list_func(at, list, j);
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412
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413 memcpy(tmp, ip, elem_size);
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414 memcpy(ip, jp, elem_size);
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415 memcpy(jp, tmp, elem_size);
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416
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417 free(tmp);
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418
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419 return 0;
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420 }
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421
677
b09aae58bba4 refactoring of collections to make use of destructors in map implementations
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diff changeset
422 void cxListDestroy(CxList *list) {
524
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423 list->cl->destructor(list);
503
a89857072ace add new destructor API and apply it to CxList
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diff changeset
424 }
618
1f5a8f6f3015 #219 array list: implement compare
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425
1f5a8f6f3015 #219 array list: implement compare
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diff changeset
426 int cxListCompare(
890
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427 const CxList *list,
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428 const CxList *other
618
1f5a8f6f3015 #219 array list: implement compare
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diff changeset
429 ) {
875
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430 bool cannot_optimize = false;
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431
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432 // if one is storing pointers but the other is not
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433 cannot_optimize |= list->collection.store_pointer ^ other->collection.store_pointer;
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434
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435 // if one class is wrapped but the other is not
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diff changeset
436 cannot_optimize |= (list->climpl == NULL) ^ (other->climpl == NULL);
705
0d5447230044 fix cxListCompare if-condition
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parents: 704
diff changeset
437
875
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438 // if the compare functions do not match or both are NULL
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439 if (!cannot_optimize) {
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diff changeset
440 cx_compare_func list_cmp = (cx_compare_func) (list->climpl != NULL ?
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diff changeset
441 list->climpl->compare : list->cl->compare);
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442 cx_compare_func other_cmp = (cx_compare_func) (other->climpl != NULL ?
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diff changeset
443 other->climpl->compare : other->cl->compare);
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444 cannot_optimize |= list_cmp != other_cmp;
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diff changeset
445 cannot_optimize |= list_cmp == NULL;
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diff changeset
446 }
705
0d5447230044 fix cxListCompare if-condition
Mike Becker <universe@uap-core.de>
parents: 704
diff changeset
447
875
ee84ac776cbc add default impl for some list member functions
Mike Becker <universe@uap-core.de>
parents: 856
diff changeset
448 if (cannot_optimize) {
680
19379743e5a0 fix wrong operator precedence in destructor macros
Mike Becker <universe@uap-core.de>
parents: 677
diff changeset
449 // lists are definitely different - cannot use internal compare function
856
6bbbf219251d fix name of collection base member (to avoid base.base)
Mike Becker <universe@uap-core.de>
parents: 855
diff changeset
450 if (list->collection.size == other->collection.size) {
776
874cc78cdffd fix accidental generation of cxListIterator() symbol
Mike Becker <universe@uap-core.de>
parents: 764
diff changeset
451 CxIterator left = list->cl->iterator(list, 0, false);
802
30473af255b4 fix #356 : broken cxListCompare
Mike Becker <universe@uap-core.de>
parents: 776
diff changeset
452 CxIterator right = other->cl->iterator(other, 0, false);
856
6bbbf219251d fix name of collection base member (to avoid base.base)
Mike Becker <universe@uap-core.de>
parents: 855
diff changeset
453 for (size_t i = 0; i < list->collection.size; i++) {
630
ac5e7f789048 separate iterators and mutating iterators
Mike Becker <universe@uap-core.de>
parents: 628
diff changeset
454 void *leftValue = cxIteratorCurrent(left);
ac5e7f789048 separate iterators and mutating iterators
Mike Becker <universe@uap-core.de>
parents: 628
diff changeset
455 void *rightValue = cxIteratorCurrent(right);
856
6bbbf219251d fix name of collection base member (to avoid base.base)
Mike Becker <universe@uap-core.de>
parents: 855
diff changeset
456 int d = list->collection.cmpfunc(leftValue, rightValue);
618
1f5a8f6f3015 #219 array list: implement compare
Mike Becker <universe@uap-core.de>
parents: 528
diff changeset
457 if (d != 0) {
1f5a8f6f3015 #219 array list: implement compare
Mike Becker <universe@uap-core.de>
parents: 528
diff changeset
458 return d;
1f5a8f6f3015 #219 array list: implement compare
Mike Becker <universe@uap-core.de>
parents: 528
diff changeset
459 }
630
ac5e7f789048 separate iterators and mutating iterators
Mike Becker <universe@uap-core.de>
parents: 628
diff changeset
460 cxIteratorNext(left);
ac5e7f789048 separate iterators and mutating iterators
Mike Becker <universe@uap-core.de>
parents: 628
diff changeset
461 cxIteratorNext(right);
618
1f5a8f6f3015 #219 array list: implement compare
Mike Becker <universe@uap-core.de>
parents: 528
diff changeset
462 }
1f5a8f6f3015 #219 array list: implement compare
Mike Becker <universe@uap-core.de>
parents: 528
diff changeset
463 return 0;
1f5a8f6f3015 #219 array list: implement compare
Mike Becker <universe@uap-core.de>
parents: 528
diff changeset
464 } else {
856
6bbbf219251d fix name of collection base member (to avoid base.base)
Mike Becker <universe@uap-core.de>
parents: 855
diff changeset
465 return list->collection.size < other->collection.size ? -1 : 1;
618
1f5a8f6f3015 #219 array list: implement compare
Mike Becker <universe@uap-core.de>
parents: 528
diff changeset
466 }
680
19379743e5a0 fix wrong operator precedence in destructor macros
Mike Becker <universe@uap-core.de>
parents: 677
diff changeset
467 } else {
19379743e5a0 fix wrong operator precedence in destructor macros
Mike Becker <universe@uap-core.de>
parents: 677
diff changeset
468 // lists are compatible
19379743e5a0 fix wrong operator precedence in destructor macros
Mike Becker <universe@uap-core.de>
parents: 677
diff changeset
469 return list->cl->compare(list, other);
618
1f5a8f6f3015 #219 array list: implement compare
Mike Becker <universe@uap-core.de>
parents: 528
diff changeset
470 }
1f5a8f6f3015 #219 array list: implement compare
Mike Becker <universe@uap-core.de>
parents: 528
diff changeset
471 }
640
55cc3b373c5e simplify list class - fixes #236
Mike Becker <universe@uap-core.de>
parents: 630
diff changeset
472
853
d4baf4dd55c3 simplify iterator structures
Mike Becker <universe@uap-core.de>
parents: 802
diff changeset
473 CxIterator cxListMutIteratorAt(
640
55cc3b373c5e simplify list class - fixes #236
Mike Becker <universe@uap-core.de>
parents: 630
diff changeset
474 CxList *list,
55cc3b373c5e simplify list class - fixes #236
Mike Becker <universe@uap-core.de>
parents: 630
diff changeset
475 size_t index
55cc3b373c5e simplify list class - fixes #236
Mike Becker <universe@uap-core.de>
parents: 630
diff changeset
476 ) {
655
7340c4255f1f implement backwards iterator - fixes #238
Mike Becker <universe@uap-core.de>
parents: 647
diff changeset
477 CxIterator it = list->cl->iterator(list, index, false);
854
fe0d69d72bcd fix members inherited by macro or include are not documented
Mike Becker <universe@uap-core.de>
parents: 853
diff changeset
478 it.base.mutating = true;
853
d4baf4dd55c3 simplify iterator structures
Mike Becker <universe@uap-core.de>
parents: 802
diff changeset
479 return it;
640
55cc3b373c5e simplify list class - fixes #236
Mike Becker <universe@uap-core.de>
parents: 630
diff changeset
480 }
655
7340c4255f1f implement backwards iterator - fixes #238
Mike Becker <universe@uap-core.de>
parents: 647
diff changeset
481
853
d4baf4dd55c3 simplify iterator structures
Mike Becker <universe@uap-core.de>
parents: 802
diff changeset
482 CxIterator cxListMutBackwardsIteratorAt(
655
7340c4255f1f implement backwards iterator - fixes #238
Mike Becker <universe@uap-core.de>
parents: 647
diff changeset
483 CxList *list,
7340c4255f1f implement backwards iterator - fixes #238
Mike Becker <universe@uap-core.de>
parents: 647
diff changeset
484 size_t index
7340c4255f1f implement backwards iterator - fixes #238
Mike Becker <universe@uap-core.de>
parents: 647
diff changeset
485 ) {
7340c4255f1f implement backwards iterator - fixes #238
Mike Becker <universe@uap-core.de>
parents: 647
diff changeset
486 CxIterator it = list->cl->iterator(list, index, true);
854
fe0d69d72bcd fix members inherited by macro or include are not documented
Mike Becker <universe@uap-core.de>
parents: 853
diff changeset
487 it.base.mutating = true;
853
d4baf4dd55c3 simplify iterator structures
Mike Becker <universe@uap-core.de>
parents: 802
diff changeset
488 return it;
655
7340c4255f1f implement backwards iterator - fixes #238
Mike Becker <universe@uap-core.de>
parents: 647
diff changeset
489 }

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