ucx/cx/iterator.h

Sun, 17 Dec 2023 15:33:50 +0100

author
Mike Becker <universe@uap-core.de>
date
Sun, 17 Dec 2023 15:33:50 +0100
changeset 800
30d484806c2b
parent 776
96555c0ed875
child 816
839fefbdedc7
permissions
-rw-r--r--

fix faulty string to int conversion utilities

Probably it was expected that errno is set to EINVAL when illegal characters are encountered. But this is not standard and does not happen on every system, allowing illegal strings to be parsed as valid integers.

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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 * \file iterator.h
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30 * \brief Interface for iterator implementations.
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31 * \author Mike Becker
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32 * \author Olaf Wintermann
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33 * \version 3.0
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34 * \copyright 2-Clause BSD License
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35 */
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36
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37 #ifndef UCX_ITERATOR_H
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38 #define UCX_ITERATOR_H
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39
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40 #include "common.h"
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41
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42 /**
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43 * The base of mutating and non-mutating iterators.
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44 */
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45 struct cx_iterator_base_s {
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46 /**
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47 * True iff the iterator points to valid data.
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48 */
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49 __attribute__ ((__nonnull__))
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50 bool (*valid)(void const *);
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51
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52 /**
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53 * Returns a pointer to the current element.
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54 *
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55 * When valid returns false, the behavior of this function is undefined.
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56 */
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57 __attribute__ ((__nonnull__))
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58 void *(*current)(void const *);
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59
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60 /**
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61 * Original implementation in case the function needs to be wrapped.
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62 */
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63 __attribute__ ((__nonnull__))
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64 void *(*current_impl)(void const *);
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65
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66 /**
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67 * Advances the iterator.
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68 *
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69 * When valid returns false, the behavior of this function is undefined.
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70 */
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71 __attribute__ ((__nonnull__))
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72 void (*next)(void *);
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73
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74 /**
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75 * Flag current element for removal, if possible.
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76 *
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77 * When valid returns false, the behavior of this function is undefined.
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78 */
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79 __attribute__ ((__nonnull__))
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80 bool (*flag_removal)(void *);
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81
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82 /**
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83 * Indicates whether this iterator may remove elements.
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84 */
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85 bool mutating;
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86
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87 /**
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88 * Internal flag for removing the current element when advancing.
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89 */
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90 bool remove;
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91 };
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92
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93 /**
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94 * Internal iterator struct - use CxMutIterator.
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95 */
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96 struct cx_mut_iterator_s {
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97
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98 /**
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99 * The base properties of this iterator.
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100 */
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101 struct cx_iterator_base_s base;
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102
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103 /**
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104 * Handle for the current element, if required.
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105 */
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106 void *elem_handle;
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107
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108 /**
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109 * Handle for the source collection, if any.
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110 */
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111 void *src_handle;
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112
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113 /**
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114 * Field for storing a key-value pair.
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115 * May be used by iterators that iterate over k/v-collections.
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116 */
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117 struct {
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118 /**
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119 * A pointer to the key.
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120 */
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121 void const *key;
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122 /**
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123 * A pointer to the value.
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124 */
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125 void *value;
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126 } kv_data;
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127
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128 /**
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129 * Field for storing a slot number.
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130 * May be used by iterators that iterate over multi-bucket collections.
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131 */
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132 size_t slot;
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133
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134 /**
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135 * If the iterator is position-aware, contains the index of the element in the underlying collection.
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136 * Otherwise, this field is usually uninitialized.
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137 */
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138 size_t index;
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139 };
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140
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141 /**
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142 * Mutating iterator value type.
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143 *
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144 * An iterator points to a certain element in an (possibly unbounded) chain of elements.
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145 * Iterators that are based on collections (which have a defined "first" element), are supposed
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146 * to be "position-aware", which means that they keep track of the current index within the collection.
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147 *
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148 * @note Objects that are pointed to by an iterator are mutable through that iterator. However, if the
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149 * iterator is based on a collection and the underlying collection is mutated by other means than this iterator
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150 * (e.g. elements added or removed), the iterator becomes invalid (regardless of what cxIteratorValid() returns)
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151 * and MUST be re-obtained from the collection.
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152 *
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153 * @see CxIterator
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154 */
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155 typedef struct cx_mut_iterator_s CxMutIterator;
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156
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157 /**
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158 * Internal iterator struct - use CxIterator.
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159 */
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160 struct cx_iterator_s {
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161
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162 /**
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163 * The base properties of this iterator.
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164 */
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165 struct cx_iterator_base_s base;
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166
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167 /**
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168 * Handle for the current element, if required.
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169 */
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170 void *elem_handle;
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171
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172 /**
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173 * Handle for the source collection, if any.
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174 */
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175 void const *src_handle;
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176
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177 /**
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178 * Field for storing a key-value pair.
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179 * May be used by iterators that iterate over k/v-collections.
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180 */
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181 struct {
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182 /**
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183 * A pointer to the key.
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184 */
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185 void const *key;
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186 /**
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187 * A pointer to the value.
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188 */
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189 void *value;
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190 } kv_data;
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191
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192 /**
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193 * Field for storing a slot number.
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194 * May be used by iterators that iterate over multi-bucket collections.
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195 */
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196 size_t slot;
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197
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198 /**
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199 * If the iterator is position-aware, contains the index of the element in the underlying collection.
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200 * Otherwise, this field is usually uninitialized.
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201 */
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202 size_t index;
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203 };
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204
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205 /**
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206 * Iterator value type.
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207 * An iterator points to a certain element in a (possibly unbounded) chain of elements.
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208 * Iterators that are based on collections (which have a defined "first" element), are supposed
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209 * to be "position-aware", which means that they keep track of the current index within the collection.
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210 *
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211 * @note Objects that are pointed to by an iterator are always mutable through that iterator. However,
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212 * this iterator cannot mutate the collection itself (add or remove elements) and any mutation of the
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213 * collection by other means makes this iterator invalid (regardless of what cxIteratorValid() returns).
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214 *
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215 * @see CxMutIterator
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216 */
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217 typedef struct cx_iterator_s CxIterator;
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218
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219 /**
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220 * Checks if the iterator points to valid data.
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221 *
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222 * This is especially false for past-the-end iterators.
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223 *
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224 * @param iter the iterator
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225 * @return true iff the iterator points to valid data
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226 */
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227 #define cxIteratorValid(iter) (iter).base.valid(&(iter))
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228
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229 /**
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230 * Returns a pointer to the current element.
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231 *
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232 * The behavior is undefined if this iterator is invalid.
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233 *
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234 * @param iter the iterator
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235 * @return a pointer to the current element
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236 */
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237 #define cxIteratorCurrent(iter) (iter).base.current(&iter)
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238
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239 /**
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240 * Advances the iterator to the next element.
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241 *
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242 * @param iter the iterator
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243 */
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244 #define cxIteratorNext(iter) (iter).base.next(&iter)
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245
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246 /**
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247 * Flags the current element for removal.
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248 *
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249 * @param iter the iterator
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250 * @return false if this iterator cannot remove the element
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251 */
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252 #define cxIteratorFlagRemoval(iter) (iter).base.flag_removal(&iter)
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253
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254 /**
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255 * Loops over an iterator.
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256 * @param type the type of the elements
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257 * @param elem the name of the iteration variable
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258 * @param iter the iterator
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259 */
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260 #define cx_foreach(type, elem, iter) \
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261 for (type elem; cxIteratorValid(iter) && (elem = (type)cxIteratorCurrent(iter)) != NULL ; cxIteratorNext(iter))
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262
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263 #endif // UCX_ITERATOR_H

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