src/ucx/array_list.c

Fri, 10 Mar 2023 22:45:58 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Fri, 10 Mar 2023 22:45:58 +0100
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log error in get_next_token()

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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 minsize = index + elem_count;
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56 size_t newsize = *size < minsize ? minsize : *size;
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57 bool needrealloc = newsize > cap;
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58
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59 // reallocate if possible
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60 if (needrealloc) {
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61 // a reallocator and a capacity variable must be available
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62 if (reallocator == NULL || capacity == NULL) {
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63 return CX_ARRAY_COPY_REALLOC_NOT_SUPPORTED;
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64 }
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65
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66 // check, if we need to repair the src pointer
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67 uintptr_t targetaddr = (uintptr_t) *target;
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68 uintptr_t srcaddr = (uintptr_t) src;
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69 bool repairsrc = targetaddr <= srcaddr
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70 && srcaddr < targetaddr + cap * elem_size;
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71
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72 // calculate new capacity (next number divisible by 16)
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73 cap = newsize - (newsize % 16) + 16;
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74 assert(cap > newsize);
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75
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76 // perform reallocation
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77 void *newmem = reallocator->realloc(
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78 *target, cap, elem_size, reallocator
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79 );
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80 if (newmem == NULL) {
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81 return CX_ARRAY_COPY_REALLOC_FAILED;
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82 }
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83
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84 // repair src pointer, if necessary
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85 if (repairsrc) {
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86 src = ((char *) newmem) + (srcaddr - targetaddr);
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87 }
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88
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89 // store new pointer and capacity
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90 *target = newmem;
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91 *capacity = cap;
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92 }
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93
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94 // determine target pointer
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95 char *start = *target;
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96 start += index * elem_size;
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97
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98 // copy elements and set new size
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99 memmove(start, src, elem_count * elem_size);
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100 *size = newsize;
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101
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102 // return successfully
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103 return CX_ARRAY_COPY_SUCCESS;
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104 }
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105
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106 #define CX_ARRAY_SWAP_SBO_SIZE 512
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107
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108 void cx_array_swap(
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109 void *arr,
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110 size_t elem_size,
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111 size_t idx1,
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112 size_t idx2
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113 ) {
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114 // short circuit
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115 if (idx1 == idx2) return;
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116
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117 char sbo_mem[CX_ARRAY_SWAP_SBO_SIZE];
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118 void *tmp;
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119
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120 // decide if we can use the local buffer
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121 if (elem_size > CX_ARRAY_SWAP_SBO_SIZE) {
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122 tmp = malloc(elem_size);
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123 // we don't want to enforce error handling
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124 if (tmp == NULL) abort();
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125 } else {
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126 tmp = sbo_mem;
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127 }
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128
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129 // calculate memory locations
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130 char *left = arr, *right = arr;
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131 left += idx1 * elem_size;
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132 right += idx2 * elem_size;
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133
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134 // three-way swap
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135 memcpy(tmp, left, elem_size);
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136 memcpy(left, right, elem_size);
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137 memcpy(right, tmp, elem_size);
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138
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139 // free dynamic memory, if it was needed
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140 if (tmp != sbo_mem) {
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141 free(tmp);
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142 }
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143 }
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144
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145 // HIGH LEVEL ARRAY LIST FUNCTIONS
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146
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147 typedef struct {
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148 struct cx_list_s base;
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149 void *data;
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150 struct cx_array_reallocator_s reallocator;
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151 } cx_array_list;
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152
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153 static void *cx_arl_realloc(
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154 void *array,
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155 size_t capacity,
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156 size_t elem_size,
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157 struct cx_array_reallocator_s *alloc
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158 ) {
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159 // retrieve the pointer to the list allocator
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160 CxAllocator const *al = alloc->ptr1;
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161
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162 // use the list allocator to reallocate the memory
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163 return cxRealloc(al, array, capacity * elem_size);
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164 }
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165
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166 static void cx_arl_destructor(struct cx_list_s *list) {
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167 cx_array_list *arl = (cx_array_list *) list;
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168 cxFree(list->allocator, arl->data);
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169 }
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170
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171 static int cx_arl_add(
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172 struct cx_list_s *list,
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173 void const *elem
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174 ) {
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175 cx_array_list *arl = (cx_array_list *) list;
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176 return cx_array_copy(
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177 &arl->data,
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178 &list->size,
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179 &list->capacity,
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180 list->size,
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181 elem,
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182 list->itemsize,
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183 1,
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184 &arl->reallocator
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185 );
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186 }
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187
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188 static size_t cx_arl_add_array(
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189 struct cx_list_s *list,
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190 void const *array,
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191 size_t n
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192 ) {
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193 cx_array_list *arl = (cx_array_list *) list;
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194 if (CX_ARRAY_COPY_SUCCESS == cx_array_copy(
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195 &arl->data,
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196 &list->size,
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197 &list->capacity,
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198 list->size,
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199 array,
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200 list->itemsize,
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201 n,
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202 &arl->reallocator
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203 )) {
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204 return n;
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205 } else {
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206 // array list implementation is "all or nothing"
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207 return 0;
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208 }
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209 }
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210
436
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211 static int cx_arl_insert(
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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 *elem
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215 ) {
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216 if (index > list->size) {
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217 return 1;
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218 } else if (index == list->size) {
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219 return cx_arl_add(list, elem);
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220 } else {
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221 cx_array_list *arl = (cx_array_list *) list;
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222
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223 // move elements starting at index to the right
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224 if (cx_array_copy(
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225 &arl->data,
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226 &list->size,
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227 &list->capacity,
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228 index + 1,
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229 ((char *) arl->data) + index * list->itemsize,
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230 list->itemsize,
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231 list->size - index,
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232 &arl->reallocator
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233 )) {
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234 return 1;
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235 }
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236
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237 // place the element
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238 memcpy(((char *) arl->data) + index * list->itemsize,
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239 elem, list->itemsize);
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240
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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 static int cx_arl_insert_iter(
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246 struct cx_mut_iterator_s *iter,
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247 void const *elem,
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248 int prepend
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249 ) {
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250 struct cx_list_s *list = iter->src_handle;
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251 if (iter->index < list->size) {
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252 int result = cx_arl_insert(
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253 list,
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254 iter->index + 1 - prepend,
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255 elem
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256 );
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257 if (result == 0 && prepend != 0) {
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258 iter->index++;
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259 iter->elem_handle = ((char *) iter->elem_handle) + list->itemsize;
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260 }
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261 return result;
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262 } else {
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263 int result = cx_arl_add(list, elem);
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264 iter->index = list->size;
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265 return result;
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266 }
436
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267 }
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268
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269 static int cx_arl_remove(
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270 struct cx_list_s *list,
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271 size_t index
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272 ) {
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273 // out-of-bounds check
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274 if (index >= list->size) {
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275 return 1;
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276 }
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277
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278 // short-circuit removal of last element
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279 if (index == list->size - 1) {
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280 list->size--;
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281 return 0;
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282 }
436
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283
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284 // just move the elements starting at index to the left
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285 cx_array_list *arl = (cx_array_list *) list;
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286 int result = cx_array_copy(
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287 &arl->data,
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288 &list->size,
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289 &list->capacity,
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290 index,
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291 ((char *) arl->data) + (index + 1) * list->itemsize,
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292 list->itemsize,
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293 list->size - index - 1,
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294 &arl->reallocator
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295 );
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296 if (result == 0) {
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297 // decrease the size
436
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298 list->size--;
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299 }
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300 return result;
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301 }
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302
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303 static void *cx_arl_at(
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304 struct cx_list_s const *list,
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305 size_t index
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306 ) {
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307 if (index < list->size) {
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308 cx_array_list const *arl = (cx_array_list const *) list;
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309 char *space = arl->data;
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310 return space + index * list->itemsize;
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311 } else {
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312 return NULL;
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313 }
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314 }
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315
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316 static size_t cx_arl_find(
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317 struct cx_list_s const *list,
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318 void const *elem
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319 ) {
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320 char *cur = ((cx_array_list const *) list)->data;
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321
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322 for (size_t i = 0; i < list->size; i++) {
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323 if (0 == list->cmpfunc(elem, cur)) {
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324 return i;
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325 }
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326 cur += list->itemsize;
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327 }
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328
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329 return list->size;
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330 }
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331
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332 static void cx_arl_sort(struct cx_list_s *list) {
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333 qsort(((cx_array_list *) list)->data,
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334 list->size,
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335 list->itemsize,
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336 list->cmpfunc
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337 );
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338 }
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339
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340 static int cx_arl_compare(
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341 struct cx_list_s const *list,
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342 struct cx_list_s const *other
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343 ) {
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344 if (list->size == other->size) {
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345 char const *left = ((cx_array_list const *) list)->data;
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346 char const *right = ((cx_array_list const *) other)->data;
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347 for (size_t i = 0; i < list->size; i++) {
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348 int d = list->cmpfunc(left, right);
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349 if (d != 0) {
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350 return d;
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351 }
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352 left += list->itemsize;
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353 right += other->itemsize;
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354 }
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355 return 0;
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356 } else {
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357 return list->size < other->size ? -1 : 1;
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358 }
436
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359 }
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360
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361 static void cx_arl_reverse(struct cx_list_s *list) {
438
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362 if (list->size < 2) return;
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363 void *data = ((cx_array_list const *) list)->data;
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364 size_t half = list->size / 2;
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365 for (size_t i = 0; i < half; i++) {
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366 cx_array_swap(data, list->itemsize, i, list->size - 1 - i);
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367 }
436
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368 }
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369
438
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370 static bool cx_arl_iter_valid(void const *it) {
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371 struct cx_iterator_s const *iter = it;
436
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372 struct cx_list_s const *list = iter->src_handle;
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373 return iter->index < list->size;
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374 }
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375
438
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376 static void *cx_arl_iter_current(void const *it) {
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377 struct cx_iterator_s const *iter = it;
436
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378 return iter->elem_handle;
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379 }
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380
438
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381 static void cx_arl_iter_next(void *it) {
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382 struct cx_iterator_base_s *itbase = it;
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383 if (itbase->remove) {
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384 struct cx_mut_iterator_s *iter = it;
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385 itbase->remove = false;
436
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386 cx_arl_remove(iter->src_handle, iter->index);
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387 } else {
438
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388 struct cx_iterator_s *iter = it;
436
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389 iter->index++;
438
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390 iter->elem_handle =
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391 ((char *) iter->elem_handle)
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392 + ((struct cx_list_s const *) iter->src_handle)->itemsize;
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393 }
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394 }
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395
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396 static bool cx_arl_iter_flag_rm(void *it) {
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397 struct cx_iterator_base_s *iter = it;
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398 if (iter->mutating) {
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399 iter->remove = true;
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400 return true;
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401 } else {
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402 return false;
436
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parents:
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403 }
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parents:
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404 }
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parents:
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405
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406 static struct cx_iterator_s cx_arl_iterator(
438
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diff changeset
407 struct cx_list_s const *list,
436
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408 size_t index
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parents:
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409 ) {
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410 struct cx_iterator_s iter;
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411
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412 iter.index = index;
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413 iter.src_handle = list;
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414 iter.elem_handle = cx_arl_at(list, index);
438
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415 iter.base.valid = cx_arl_iter_valid;
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416 iter.base.current = cx_arl_iter_current;
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417 iter.base.next = cx_arl_iter_next;
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418 iter.base.flag_removal = cx_arl_iter_flag_rm;
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419 iter.base.remove = false;
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420 iter.base.mutating = false;
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421
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422 return iter;
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diff changeset
423 }
436
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parents:
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424
438
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diff changeset
425 static struct cx_mut_iterator_s cx_arl_mut_iterator(
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diff changeset
426 struct cx_list_s *list,
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diff changeset
427 size_t index
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diff changeset
428 ) {
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diff changeset
429 CxIterator it = cx_arl_iterator(list, index);
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430 it.base.mutating = true;
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431
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diff changeset
432 // we know the iterators share the same memory layout
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diff changeset
433 CxMutIterator iter;
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diff changeset
434 memcpy(&iter, &it, sizeof(CxMutIterator));
436
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parents:
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435 return iter;
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parents:
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436 }
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parents:
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437
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parents:
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438 static cx_list_class cx_array_list_class = {
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parents:
diff changeset
439 cx_arl_destructor,
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440 cx_arl_add,
438
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diff changeset
441 cx_arl_add_array,
436
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442 cx_arl_insert,
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parents:
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443 cx_arl_insert_iter,
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parents:
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444 cx_arl_remove,
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parents:
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445 cx_arl_at,
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parents:
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446 cx_arl_find,
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parents:
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447 cx_arl_sort,
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parents:
diff changeset
448 cx_arl_compare,
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parents:
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449 cx_arl_reverse,
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450 cx_arl_iterator,
438
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451 cx_arl_mut_iterator,
436
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452 };
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parents:
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453
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parents:
diff changeset
454 CxList *cxArrayListCreate(
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parents:
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455 CxAllocator const *allocator,
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parents:
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456 CxListComparator comparator,
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parents:
diff changeset
457 size_t item_size,
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parents:
diff changeset
458 size_t initial_capacity
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parents:
diff changeset
459 ) {
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parents:
diff changeset
460 cx_array_list *list = cxCalloc(allocator, 1, sizeof(cx_array_list));
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461 if (list == NULL) return NULL;
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parents:
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462
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463 list->data = cxCalloc(allocator, initial_capacity, item_size);
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parents:
diff changeset
464 if (list->data == NULL) {
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diff changeset
465 cxFree(allocator, list);
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466 return NULL;
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parents:
diff changeset
467 }
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parents:
diff changeset
468
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parents:
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469 list->base.cl = &cx_array_list_class;
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470 list->base.allocator = allocator;
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471 list->base.cmpfunc = comparator;
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472 list->base.itemsize = item_size;
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473 list->base.capacity = initial_capacity;
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474
438
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diff changeset
475 // configure the reallocator
436
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476 list->reallocator.realloc = cx_arl_realloc;
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parents:
diff changeset
477 list->reallocator.ptr1 = (void *) allocator;
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parents:
diff changeset
478
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parents:
diff changeset
479 return (CxList *) list;
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parents:
diff changeset
480 }

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