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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 2016 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 | * Doubly linked list implementation. |
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30 | * |
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31 | * @file list.h |
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32 | * @author Mike Becker |
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33 | * @author Olaf Wintermann |
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34 | */ |
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35 | |
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36 | #ifndef UCX_LIST_H |
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37 | #define UCX_LIST_H |
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38 | |
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39 | #include "ucx.h" |
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40 | #include "allocator.h" |
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41 | |
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42 | #ifdef __cplusplus |
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43 | extern "C" { |
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44 | #endif |
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45 | |
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46 | /** |
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47 | * Loop statement for UCX lists. |
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48 | * |
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49 | * The first argument is the name of the iteration variable. The scope of |
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50 | * this variable is limited to the <code>UCX_FOREACH</code> statement. |
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51 | * |
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52 | * The second argument is a pointer to the list. In most cases this will be the |
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53 | * pointer to the first element of the list, but it may also be an arbitrary |
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54 | * element of the list. The iteration will then start with that element. |
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55 | * |
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56 | * @param list The first element of the list |
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57 | * @param elem The variable name of the element |
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58 | */ |
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59 | #define UCX_FOREACH(elem,list) \ |
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60 | for (UcxList* elem = list ; elem != NULL ; elem = elem->next) |
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61 | |
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62 | /** |
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63 | * UCX list type. |
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64 | * @see UcxList |
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65 | */ |
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66 | typedef struct UcxList UcxList; |
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67 | |
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68 | /** |
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69 | * UCX list structure. |
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70 | */ |
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71 | struct UcxList { |
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72 | /** |
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73 | * List element payload. |
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74 | */ |
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75 | void *data; |
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76 | /** |
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77 | * Pointer to the next list element or <code>NULL</code>, if this is the |
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78 | * last element. |
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79 | */ |
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80 | UcxList *next; |
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81 | /** |
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82 | * Pointer to the previous list element or <code>NULL</code>, if this is |
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83 | * the first element. |
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84 | */ |
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85 | UcxList *prev; |
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86 | }; |
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87 | |
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88 | /** |
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89 | * Creates an element-wise copy of a list. |
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90 | * |
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91 | * This function clones the specified list by creating new list elements and |
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92 | * copying the data with the specified copy_func(). If no copy_func() is |
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93 | * specified, a shallow copy is created and the new list will reference the |
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94 | * same data as the source list. |
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95 | * |
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96 | * @param list the list to copy |
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97 | * @param cpyfnc a pointer to the function that shall copy an element (may be |
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98 | * <code>NULL</code>) |
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99 | * @param data additional data for the copy_func() |
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100 | * @return a pointer to the copy |
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101 | */ |
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102 | UcxList *ucx_list_clone(UcxList *list, copy_func cpyfnc, void* data); |
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103 | |
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104 | /** |
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105 | * Creates an element-wise copy of a list using a UcxAllocator. |
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106 | * |
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107 | * See ucx_list_clone() for details. |
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108 | * |
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109 | * You might want to pass the allocator via the <code>data</code> parameter, |
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110 | * to access it within the copy function for making deep copies. |
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111 | * |
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112 | * @param allocator the allocator to use |
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113 | * @param list the list to copy |
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114 | * @param cpyfnc a pointer to the function that shall copy an element (may be |
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115 | * <code>NULL</code>) |
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116 | * @param data additional data for the copy_func() |
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117 | * @return a pointer to the copy |
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118 | * @see ucx_list_clone() |
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119 | */ |
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120 | UcxList *ucx_list_clone_a(UcxAllocator *allocator, UcxList *list, |
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121 | copy_func cpyfnc, void* data); |
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122 | |
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123 | /** |
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124 | * Compares two UCX lists element-wise by using a compare function. |
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125 | * |
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126 | * Each element of the two specified lists are compared by using the specified |
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127 | * compare function and the additional data. The type and content of this |
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128 | * additional data depends on the cmp_func() used. |
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129 | * |
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130 | * If the list pointers denote elements within a list, the lists are compared |
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131 | * starting with the denoted elements. Thus any previous elements are not taken |
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132 | * into account. This might be useful to check, if certain list tails match |
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133 | * each other. |
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134 | * |
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135 | * @param list1 the first list |
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136 | * @param list2 the second list |
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137 | * @param cmpfnc the compare function |
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138 | * @param data additional data for the compare function |
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139 | * @return 1, if and only if the two lists equal element-wise, 0 otherwise |
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140 | */ |
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141 | int ucx_list_equals(const UcxList *list1, const UcxList *list2, |
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142 | cmp_func cmpfnc, void* data); |
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143 | |
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144 | /** |
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145 | * Destroys the entire list. |
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146 | * |
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147 | * The members of the list are not automatically freed, so ensure they are |
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148 | * otherwise referenced or destroyed by ucx_list_free_contents(). |
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149 | * Otherwise, a memory leak is likely to occur. |
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150 | * |
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151 | * <b>Caution:</b> the argument <b>MUST</b> denote an entire list (i.e. a call |
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152 | * to ucx_list_first() on the argument must return the argument itself) |
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153 | * |
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154 | * @param list the list to free |
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155 | * @see ucx_list_free_contents() |
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156 | */ |
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157 | void ucx_list_free(UcxList *list); |
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158 | |
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159 | /** |
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160 | * Destroys the entire list using a UcxAllocator. |
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161 | * |
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162 | * See ucx_list_free() for details. |
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163 | * |
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164 | * @param allocator the allocator to use |
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165 | * @param list the list to free |
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166 | * @see ucx_list_free() |
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167 | */ |
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168 | void ucx_list_free_a(UcxAllocator *allocator, UcxList *list); |
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169 | |
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170 | /** |
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171 | * Destroys the contents of the specified list by calling the specified |
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172 | * destructor on each of them. |
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173 | * |
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174 | * Note, that the contents are not usable afterwards and the list should be |
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175 | * destroyed with ucx_list_free(). |
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176 | * |
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177 | * @param list the list for which the contents shall be freed |
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178 | * @param destr the destructor function (e.g. stdlib free()) |
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179 | * @see ucx_list_free() |
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180 | */ |
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181 | void ucx_list_free_content(UcxList* list, ucx_destructor destr); |
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182 | |
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183 | |
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184 | /** |
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185 | * Inserts an element at the end of the list. |
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186 | * |
70 | 187 | * This is generally an O(n) operation, as the end of the list is retrieved with |
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188 | * ucx_list_last(). |
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189 | * |
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190 | * @param list the list where to append the data, or <code>NULL</code> to |
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191 | * create a new list |
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192 | * @param data the data to insert |
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193 | * @return <code>list</code>, if it is not <code>NULL</code> or a pointer to |
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194 | * the newly created list otherwise |
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195 | */ |
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196 | UcxList *ucx_list_append(UcxList *list, void *data); |
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197 | |
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198 | /** |
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199 | * Inserts an element at the end of the list using a UcxAllocator. |
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200 | * |
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201 | * See ucx_list_append() for details. |
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202 | * |
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203 | * @param allocator the allocator to use |
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204 | * @param list the list where to append the data, or <code>NULL</code> to |
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205 | * create a new list |
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206 | * @param data the data to insert |
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207 | * @return <code>list</code>, if it is not <code>NULL</code> or a pointer to |
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208 | * the newly created list otherwise |
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209 | * @see ucx_list_append() |
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210 | */ |
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211 | UcxList *ucx_list_append_a(UcxAllocator *allocator, UcxList *list, void *data); |
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212 | |
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213 | /** |
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214 | * Inserts an element at the end of the list, if it is not present in the list. |
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215 | * |
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216 | * |
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217 | * @param list the list where to append the data, or <code>NULL</code> to |
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218 | * create a new list |
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219 | * @param data the data to insert |
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220 | * @param cmpfnc the compare function |
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221 | * @param cmpdata additional data for the compare function |
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222 | * @return <code>list</code>, if it is not <code>NULL</code> or a pointer to |
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223 | * the newly created list otherwise |
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224 | * @see ucx_list_append() |
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225 | */ |
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226 | UcxList *ucx_list_append_once(UcxList *list, void *data, |
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227 | cmp_func cmpfnc, void *cmpdata); |
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228 | |
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229 | /** |
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230 | * Inserts an element at the end of the list, if it is not present in the list, |
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231 | * using a UcxAllocator. |
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232 | * |
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233 | * See ucx_list_append() for details. |
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234 | * |
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235 | * @param allocator the allocator to use |
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236 | * @param list the list where to append the data, or <code>NULL</code> to |
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237 | * create a new list |
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238 | * @param data the data to insert |
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239 | * @param cmpfnc the compare function |
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240 | * @param cmpdata additional data for the compare function |
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241 | * @return <code>list</code>, if it is not <code>NULL</code> or a pointer to |
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242 | * the newly created list otherwise |
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243 | * @see ucx_list_append_a() |
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244 | */ |
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245 | UcxList *ucx_list_append_once_a(UcxAllocator *allocator, |
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246 | UcxList *list, void *data, cmp_func cmpfnc, void *cmpdata); |
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247 | |
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248 | /** |
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249 | * Inserts an element at the beginning of the list. |
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250 | * |
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251 | * You <i>should</i> overwrite the old list pointer by calling |
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252 | * <code>mylist = ucx_list_prepend(mylist, mydata);</code>. However, you may |
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253 | * also perform successive calls of ucx_list_prepend() on the same list pointer, |
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254 | * as this function always searchs for the head of the list with |
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255 | * ucx_list_first(). |
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256 | * |
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257 | * @param list the list where to insert the data or <code>NULL</code> to create |
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258 | * a new list |
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259 | * @param data the data to insert |
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260 | * @return a pointer to the new list head |
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261 | */ |
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262 | UcxList *ucx_list_prepend(UcxList *list, void *data); |
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263 | |
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264 | /** |
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265 | * Inserts an element at the beginning of the list using a UcxAllocator. |
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266 | * |
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267 | * See ucx_list_prepend() for details. |
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268 | * |
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269 | * @param allocator the allocator to use |
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270 | * @param list the list where to insert the data or <code>NULL</code> to create |
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271 | * a new list |
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272 | * @param data the data to insert |
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273 | * @return a pointer to the new list head |
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274 | * @see ucx_list_prepend() |
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275 | */ |
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276 | UcxList *ucx_list_prepend_a(UcxAllocator *allocator, UcxList *list, void *data); |
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277 | |
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278 | /** |
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279 | * Concatenates two lists. |
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280 | * |
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281 | * Either of the two arguments may be <code>NULL</code>. |
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282 | * |
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283 | * This function modifies the references to the next/previous element of |
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284 | * the last/first element of <code>list1</code>/<code> |
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285 | * list2</code>. |
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286 | * |
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287 | * @param list1 first list |
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288 | * @param list2 second list |
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289 | * @return if <code>list1</code> is <code>NULL</code>, <code>list2</code> is |
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290 | * returned, otherwise <code>list1</code> is returned |
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291 | */ |
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292 | UcxList *ucx_list_concat(UcxList *list1, UcxList *list2); |
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293 | |
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294 | /** |
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295 | * Returns the first element of a list. |
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296 | * |
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297 | * If the argument is the list pointer, it is directly returned. Otherwise |
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298 | * this function traverses to the first element of the list and returns the |
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299 | * list pointer. |
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300 | * |
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301 | * @param elem one element of the list |
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302 | * @return the first element of the list, the specified element is a member of |
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303 | */ |
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304 | UcxList *ucx_list_first(const UcxList *elem); |
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305 | |
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306 | /** |
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307 | * Returns the last element of a list. |
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308 | * |
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309 | * If the argument has no successor, it is the last element and therefore |
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310 | * directly returned. Otherwise this function traverses to the last element of |
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311 | * the list and returns it. |
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312 | * |
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313 | * @param elem one element of the list |
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314 | * @return the last element of the list, the specified element is a member of |
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315 | */ |
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316 | UcxList *ucx_list_last(const UcxList *elem); |
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317 | |
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318 | /** |
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319 | * Returns the list element at the specified index. |
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320 | * |
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321 | * @param list the list to retrieve the element from |
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322 | * @param index index of the element to return |
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323 | * @return the element at the specified index or <code>NULL</code>, if the |
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324 | * index is greater than the list size |
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325 | */ |
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327 | |
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328 | /** |
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329 | * Returns the index of an element. |
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330 | * |
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331 | * @param list the list where to search for the element |
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332 | * @param elem the element to find |
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333 | * @return the index of the element or -1 if the list does not contain the |
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334 | * element |
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335 | */ |
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336 | ssize_t ucx_list_indexof(const UcxList *list, const UcxList *elem); |
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337 | |
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338 | /** |
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339 | * Returns the element count of the list. |
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340 | * |
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341 | * @param list the list whose elements are counted |
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342 | * @return the element count |
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343 | */ |
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344 | size_t ucx_list_size(const UcxList *list); |
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345 | |
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346 | /** |
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347 | * Returns the index of an element containing the specified data. |
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348 | * |
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349 | * This function uses a cmp_func() to compare the data of each list element |
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350 | * with the specified data. If no cmp_func is provided, the pointers are |
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351 | * compared. |
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352 | * |
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353 | * If the list contains the data more than once, the index of the first |
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354 | * occurrence is returned. |
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355 | * |
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356 | * @param list the list where to search for the data |
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357 | * @param elem the element data |
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358 | * @param cmpfnc the compare function |
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359 | * @param data additional data for the compare function |
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360 | * @return the index of the element containing the specified data or -1 if the |
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361 | * data is not found in this list |
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362 | */ |
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363 | ssize_t ucx_list_find(UcxList *list, void *elem, cmp_func cmpfnc, void *data); |
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364 | |
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365 | /** |
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366 | * Checks, if a list contains a specific element. |
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367 | * |
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368 | * An element is found, if ucx_list_find() returns a value greater than -1. |
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369 | * |
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370 | * @param list the list where to search for the data |
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371 | * @param elem the element data |
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372 | * @param cmpfnc the compare function |
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373 | * @param data additional data for the compare function |
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374 | * @return 1, if and only if the list contains the specified element data |
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375 | * @see ucx_list_find() |
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376 | */ |
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377 | int ucx_list_contains(UcxList *list, void *elem, cmp_func cmpfnc, void *data); |
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378 | |
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379 | /** |
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380 | * Sorts a UcxList with natural merge sort. |
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381 | * |
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382 | * This function uses O(n) additional temporary memory for merge operations |
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383 | * that is automatically freed after each merge. |
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384 | * |
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385 | * As the head of the list might change, you <b>MUST</b> call this function |
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386 | * as follows: <code>mylist = ucx_list_sort(mylist, mycmpfnc, mydata);</code>. |
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387 | * |
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388 | * @param list the list to sort |
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389 | * @param cmpfnc the function that shall be used to compare the element data |
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390 | * @param data additional data for the cmp_func() |
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391 | * @return the sorted list |
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392 | */ |
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393 | UcxList *ucx_list_sort(UcxList *list, cmp_func cmpfnc, void *data); |
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394 | |
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395 | /** |
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396 | * Removes an element from the list. |
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397 | * |
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398 | * If the first element is removed, the list pointer changes. So it is |
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399 | * <i>highly recommended</i> to <i>always</i> update the pointer by calling |
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400 | * <code>mylist = ucx_list_remove(mylist, myelem);</code>. |
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401 | * |
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402 | * @param list the list from which the element shall be removed |
70 | 403 | * @param element the element to remove |
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404 | * @return returns the updated list pointer or <code>NULL</code>, if the list |
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405 | * is now empty |
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406 | */ |
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407 | UcxList *ucx_list_remove(UcxList *list, UcxList *element); |
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408 | |
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409 | /** |
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410 | * Removes an element from the list using a UcxAllocator. |
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411 | * |
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412 | * See ucx_list_remove() for details. |
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413 | * |
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414 | * @param allocator the allocator to use |
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415 | * @param list the list from which the element shall be removed |
70 | 416 | * @param element the element to remove |
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417 | * @return returns the updated list pointer or <code>NULL</code>, if the list |
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418 | * @see ucx_list_remove() |
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419 | */ |
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420 | UcxList *ucx_list_remove_a(UcxAllocator *allocator, UcxList *list, |
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421 | UcxList *element); |
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422 | |
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423 | #ifdef __cplusplus |
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424 | } |
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425 | #endif |
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426 | |
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427 | #endif /* UCX_LIST_H */ |
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428 |