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annotate nss/lib/dbm/include/queue.h @ 3:150b72113545

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Add DBM and legacydb support
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:32:02 +0200
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150b72113545 Add DBM and legacydb support
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1 /*
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2 * Copyright (c) 1991, 1993
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3 * The Regents of the University of California. All rights reserved.
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4 *
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5 * Redistribution and use in source and binary forms, with or without
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6 * modification, are permitted provided that the following conditions
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7 * are met:
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8 * 1. Redistributions of source code must retain the above copyright
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9 * notice, this list of conditions and the following disclaimer.
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10 * 2. Redistributions in binary form must reproduce the above copyright
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11 * notice, this list of conditions and the following disclaimer in the
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12 * documentation and/or other materials provided with the distribution.
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13 * 3. ***REMOVED*** - see
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14 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
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15 * 4. Neither the name of the University nor the names of its contributors
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16 * may be used to endorse or promote products derived from this software
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17 * without specific prior written permission.
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18 *
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19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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29 * SUCH DAMAGE.
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30 *
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31 * @(#)queue.h 8.3 (Berkeley) 12/13/93
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32 */
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33
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34 #ifndef _QUEUE_H_
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35 #define _QUEUE_H_
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36
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37 /*
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38 * This file defines three types of data structures: lists, tail queues,
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39 * and circular queues.
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40 *
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41 * A list is headed by a single forward pointer (or an array of forward
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42 * pointers for a hash table header). The elements are doubly linked
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43 * so that an arbitrary element can be removed without a need to
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44 * traverse the list. New elements can be added to the list after
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45 * an existing element or at the head of the list. A list may only be
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46 * traversed in the forward direction.
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47 *
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48 * A tail queue is headed by a pair of pointers, one to the head of the
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49 * list and the other to the tail of the list. The elements are doubly
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50 * linked so that an arbitrary element can be removed without a need to
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51 * traverse the list. New elements can be added to the list after
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52 * an existing element, at the head of the list, or at the end of the
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53 * list. A tail queue may only be traversed in the forward direction.
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54 *
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55 * A circle queue is headed by a pair of pointers, one to the head of the
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56 * list and the other to the tail of the list. The elements are doubly
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57 * linked so that an arbitrary element can be removed without a need to
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58 * traverse the list. New elements can be added to the list before or after
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59 * an existing element, at the head of the list, or at the end of the list.
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60 * A circle queue may be traversed in either direction, but has a more
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61 * complex end of list detection.
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62 *
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63 * For details on the use of these macros, see the queue(3) manual page.
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64 */
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65
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66 /*
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67 * List definitions.
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68 */
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69 #define LIST_HEAD(name, type) \
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70 struct name { \
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71 struct type *lh_first; /* first element */ \
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72 }
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73
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74 #define LIST_ENTRY(type) \
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75 struct { \
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76 struct type *le_next; /* next element */ \
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77 struct type **le_prev; /* address of previous next element */ \
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78 }
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79
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80 /*
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81 * List functions.
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82 */
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83 #define LIST_INIT(head) { \
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84 (head)->lh_first = NULL; \
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85 }
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86
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87 #define LIST_INSERT_AFTER(listelm, elm, field) { \
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88 if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \
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89 (listelm)->field.le_next->field.le_prev = \
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90 &(elm)->field.le_next; \
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91 (listelm)->field.le_next = (elm); \
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92 (elm)->field.le_prev = &(listelm)->field.le_next; \
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93 }
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94
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95 #define LIST_INSERT_HEAD(head, elm, field) { \
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96 if (((elm)->field.le_next = (head)->lh_first) != NULL) \
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97 (head)->lh_first->field.le_prev = &(elm)->field.le_next;\
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98 (head)->lh_first = (elm); \
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99 (elm)->field.le_prev = &(head)->lh_first; \
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100 }
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101
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102 #define LIST_REMOVE(elm, field) { \
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103 if ((elm)->field.le_next != NULL) \
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104 (elm)->field.le_next->field.le_prev = \
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105 (elm)->field.le_prev; \
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106 *(elm)->field.le_prev = (elm)->field.le_next; \
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107 }
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108
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109 /*
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110 * Tail queue definitions.
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111 */
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112 #define TAILQ_HEAD(name, type) \
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113 struct name { \
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114 struct type *tqh_first; /* first element */ \
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115 struct type **tqh_last; /* addr of last next element */ \
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116 }
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117
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118 #define TAILQ_ENTRY(type) \
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119 struct { \
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120 struct type *tqe_next; /* next element */ \
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121 struct type **tqe_prev; /* address of previous next element */ \
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122 }
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123
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124 /*
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125 * Tail queue functions.
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126 */
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127 #define TAILQ_INIT(head) { \
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128 (head)->tqh_first = NULL; \
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129 (head)->tqh_last = &(head)->tqh_first; \
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130 }
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131
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132 #define TAILQ_INSERT_HEAD(head, elm, field) { \
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133 if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \
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134 (elm)->field.tqe_next->field.tqe_prev = \
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135 &(elm)->field.tqe_next; \
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136 else \
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137 (head)->tqh_last = &(elm)->field.tqe_next; \
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138 (head)->tqh_first = (elm); \
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139 (elm)->field.tqe_prev = &(head)->tqh_first; \
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140 }
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141
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142 #define TAILQ_INSERT_TAIL(head, elm, field) { \
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143 (elm)->field.tqe_next = NULL; \
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144 (elm)->field.tqe_prev = (head)->tqh_last; \
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145 *(head)->tqh_last = (elm); \
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146 (head)->tqh_last = &(elm)->field.tqe_next; \
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147 }
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148
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149 #define TAILQ_INSERT_AFTER(head, listelm, elm, field) { \
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150 if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
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151 (elm)->field.tqe_next->field.tqe_prev = \
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152 &(elm)->field.tqe_next; \
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153 else \
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154 (head)->tqh_last = &(elm)->field.tqe_next; \
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155 (listelm)->field.tqe_next = (elm); \
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156 (elm)->field.tqe_prev = &(listelm)->field.tqe_next; \
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157 }
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158
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159 #define TAILQ_REMOVE(head, elm, field) { \
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160 if (((elm)->field.tqe_next) != NULL) \
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161 (elm)->field.tqe_next->field.tqe_prev = \
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162 (elm)->field.tqe_prev; \
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163 else \
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164 (head)->tqh_last = (elm)->field.tqe_prev; \
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165 *(elm)->field.tqe_prev = (elm)->field.tqe_next; \
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166 }
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167
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168 /*
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169 * Circular queue definitions.
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170 */
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171 #define CIRCLEQ_HEAD(name, type) \
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172 struct name { \
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173 struct type *cqh_first; /* first element */ \
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174 struct type *cqh_last; /* last element */ \
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175 }
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176
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177 #define CIRCLEQ_ENTRY(type) \
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178 struct { \
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179 struct type *cqe_next; /* next element */ \
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180 struct type *cqe_prev; /* previous element */ \
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181 }
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182
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183 /*
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184 * Circular queue functions.
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185 */
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186 #define CIRCLEQ_INIT(head) { \
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187 (head)->cqh_first = (void *)(head); \
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188 (head)->cqh_last = (void *)(head); \
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189 }
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190
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191 #define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) { \
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192 (elm)->field.cqe_next = (listelm)->field.cqe_next; \
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193 (elm)->field.cqe_prev = (listelm); \
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194 if ((listelm)->field.cqe_next == (void *)(head)) \
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195 (head)->cqh_last = (elm); \
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196 else \
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197 (listelm)->field.cqe_next->field.cqe_prev = (elm); \
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198 (listelm)->field.cqe_next = (elm); \
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199 }
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200
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201 #define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) { \
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202 (elm)->field.cqe_next = (listelm); \
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203 (elm)->field.cqe_prev = (listelm)->field.cqe_prev; \
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204 if ((listelm)->field.cqe_prev == (void *)(head)) \
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205 (head)->cqh_first = (elm); \
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206 else \
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207 (listelm)->field.cqe_prev->field.cqe_next = (elm); \
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208 (listelm)->field.cqe_prev = (elm); \
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209 }
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210
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211 #define CIRCLEQ_INSERT_HEAD(head, elm, field) { \
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212 (elm)->field.cqe_next = (head)->cqh_first; \
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213 (elm)->field.cqe_prev = (void *)(head); \
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214 if ((head)->cqh_last == (void *)(head)) \
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215 (head)->cqh_last = (elm); \
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216 else \
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217 (head)->cqh_first->field.cqe_prev = (elm); \
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218 (head)->cqh_first = (elm); \
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219 }
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220
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221 #define CIRCLEQ_INSERT_TAIL(head, elm, field) { \
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222 (elm)->field.cqe_next = (void *)(head); \
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223 (elm)->field.cqe_prev = (head)->cqh_last; \
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224 if ((head)->cqh_first == (void *)(head)) \
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225 (head)->cqh_first = (elm); \
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226 else \
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227 (head)->cqh_last->field.cqe_next = (elm); \
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228 (head)->cqh_last = (elm); \
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229 }
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230
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231 #define CIRCLEQ_REMOVE(head, elm, field) { \
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232 if ((elm)->field.cqe_next == (void *)(head)) \
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233 (head)->cqh_last = (elm)->field.cqe_prev; \
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234 else \
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235 (elm)->field.cqe_next->field.cqe_prev = \
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236 (elm)->field.cqe_prev; \
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237 if ((elm)->field.cqe_prev == (void *)(head)) \
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238 (head)->cqh_first = (elm)->field.cqe_next; \
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239 else \
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240 (elm)->field.cqe_prev->field.cqe_next = \
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241 (elm)->field.cqe_next; \
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242 }
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243 #endif /* !_QUEUE_H_ */
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