ucx/cx/tree.h

Tue, 09 Apr 2024 21:28:24 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Tue, 09 Apr 2024 21:28:24 +0200
changeset 810
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parent 747
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child 816
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permissions
-rw-r--r--

don't store directories with a trailing path separator in the sync db

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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 tree.h
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30 * \brief Interface for tree implementations.
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31 * \author Olaf Wintermann
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32 * \author Mike Becker
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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_TREE_H
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38 #define UCX_TREE_H
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39
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40 #include "common.h"
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41 #include "allocator.h"
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42
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43 #ifdef __cplusplus
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44 extern "C" {
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45 #endif
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46
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47 /**
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48 * Adds a sibling to the current tree node.
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49 *
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50 * In case your struct does not have a \p prev or a \p parent pointer,
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51 * specify a negative location. The location of the \p next pointer is
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52 * mandatory.
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53 *
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54 * \attention Do not use this function to add siblings in a tree where the
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55 * nodes store a pointer to the last sibling because that would not be modified by this function.
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56 *
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57 * \remark If yo do not provide a location to the parent pointer, a call to this function is
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58 * effectively the same as a call to cx_linked_list_add().
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59 *
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60 * @param node a pointer to the node
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61 * @param loc_prev the location of a \c prev pointer within your node struct
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62 * @param loc_next the location of a \c next pointer within your node struct
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63 * @param loc_parent the location of a \c parent pointer within your node struct
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64 * @param new_node the new node that shall be added as a sibling
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65 */
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66 void cx_tree_add_sibling(void *node,
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67 ptrdiff_t loc_prev, ptrdiff_t loc_next,
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68 ptrdiff_t loc_parent,
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69 void *new_node)
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70 __attribute__((__nonnull__));
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71
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72 /**
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73 * Adds a node to the list of children.
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74 *
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75 * \par Example with a full structure
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76 * A full tree node structure may look like this:
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77 * \code
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78 * typedef struct MyTreeNode MyTreeNode;
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79 * struct MyTreeNode {
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80 * MyTreeNode* parent;
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81 * MyTreeNode* first_child;
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82 * MyTreeNode* last_child;
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83 * MyTreeNode* prev_sibling;
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84 * MyTreeNode* next_sibling;
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85 * // ...contents...
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86 * }
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87 * \endcode
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88 * Adding a new child to a node with the above structure can be performed with the following call:
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89 * \code
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90 * MyTreeNode *node, *child; // given
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91 * cx_tree_add_child(&node->first_child, &node->last_child,
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92 * offsetof(MyTreeNode, prev_sibling), offsetof(MyTreeNode, next_sibling),
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93 * child, offsetof(MyTreeNode, parent), node);
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94 * \endcode
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95 *
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96 * \par Example with a reduced structure
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97 * The minimal reasonable structure with parent pointer looks like this:
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98 * \code
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99 * typedef struct MyTreeNode MyTreeNode;
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100 * struct MyTreeNode {
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101 * MyTreeNode* parent;
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102 * MyTreeNode* children;
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103 * MyTreeNode* next_sibling;
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104 * // ...contents...
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105 * }
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106 * \endcode
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107 * This simplifies the function call to:
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108 * \code
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109 * MyTreeNode *node, *child; // given
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110 * cx_tree_add_child(&node->children, NULL, -1, offsetof(MyTreeNode, next_sibling),
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111 * child, offsetof(MyTreeNode, parent), node);
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112 * \endcode
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113 *
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114 * \remark If your tree structure does not possess a parent pointer, a call to this function is
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115 * effectively the same as a call to cx_linked_list_add().
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116 *
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117 * @param children_begin a pointer to the begin node pointer (if your list has one)
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118 * @param children_end a pointer to the end node pointer (if your list has one)
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119 * @param loc_prev the location of a \c prev pointer within your node struct
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120 * @param loc_next the location of a \c next pointer within your node struct
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121 * @param new_node a pointer to the node that shall be appended
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122 * @param loc_parent the location of a \c parent pointer within your node struct
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123 * @param parent the parent node
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124 */
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125 void cx_tree_add_child(void **children_begin, void **children_end,
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126 ptrdiff_t loc_prev, ptrdiff_t loc_next, void *new_node,
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127 ptrdiff_t loc_parent, void *parent)
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128 __attribute__((__nonnull__ (5)));
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130
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131 #ifdef __cplusplus
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132 } // extern "C"
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133 #endif
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134
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135 #endif // UCX_TREE_H
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136

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