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comparison 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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2:a945361df361 3:150b72113545
1 /*
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. ***REMOVED*** - see
14 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
15 * 4. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)queue.h 8.3 (Berkeley) 12/13/93
32 */
33
34 #ifndef _QUEUE_H_
35 #define _QUEUE_H_
36
37 /*
38 * This file defines three types of data structures: lists, tail queues,
39 * and circular queues.
40 *
41 * A list is headed by a single forward pointer (or an array of forward
42 * pointers for a hash table header). The elements are doubly linked
43 * so that an arbitrary element can be removed without a need to
44 * traverse the list. New elements can be added to the list after
45 * an existing element or at the head of the list. A list may only be
46 * traversed in the forward direction.
47 *
48 * A tail queue is headed by a pair of pointers, one to the head of the
49 * list and the other to the tail of the list. The elements are doubly
50 * linked so that an arbitrary element can be removed without a need to
51 * traverse the list. New elements can be added to the list after
52 * an existing element, at the head of the list, or at the end of the
53 * list. A tail queue may only be traversed in the forward direction.
54 *
55 * A circle queue is headed by a pair of pointers, one to the head of the
56 * list and the other to the tail of the list. The elements are doubly
57 * linked so that an arbitrary element can be removed without a need to
58 * traverse the list. New elements can be added to the list before or after
59 * an existing element, at the head of the list, or at the end of the list.
60 * A circle queue may be traversed in either direction, but has a more
61 * complex end of list detection.
62 *
63 * For details on the use of these macros, see the queue(3) manual page.
64 */
65
66 /*
67 * List definitions.
68 */
69 #define LIST_HEAD(name, type) \
70 struct name { \
71 struct type *lh_first; /* first element */ \
72 }
73
74 #define LIST_ENTRY(type) \
75 struct { \
76 struct type *le_next; /* next element */ \
77 struct type **le_prev; /* address of previous next element */ \
78 }
79
80 /*
81 * List functions.
82 */
83 #define LIST_INIT(head) { \
84 (head)->lh_first = NULL; \
85 }
86
87 #define LIST_INSERT_AFTER(listelm, elm, field) { \
88 if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \
89 (listelm)->field.le_next->field.le_prev = \
90 &(elm)->field.le_next; \
91 (listelm)->field.le_next = (elm); \
92 (elm)->field.le_prev = &(listelm)->field.le_next; \
93 }
94
95 #define LIST_INSERT_HEAD(head, elm, field) { \
96 if (((elm)->field.le_next = (head)->lh_first) != NULL) \
97 (head)->lh_first->field.le_prev = &(elm)->field.le_next;\
98 (head)->lh_first = (elm); \
99 (elm)->field.le_prev = &(head)->lh_first; \
100 }
101
102 #define LIST_REMOVE(elm, field) { \
103 if ((elm)->field.le_next != NULL) \
104 (elm)->field.le_next->field.le_prev = \
105 (elm)->field.le_prev; \
106 *(elm)->field.le_prev = (elm)->field.le_next; \
107 }
108
109 /*
110 * Tail queue definitions.
111 */
112 #define TAILQ_HEAD(name, type) \
113 struct name { \
114 struct type *tqh_first; /* first element */ \
115 struct type **tqh_last; /* addr of last next element */ \
116 }
117
118 #define TAILQ_ENTRY(type) \
119 struct { \
120 struct type *tqe_next; /* next element */ \
121 struct type **tqe_prev; /* address of previous next element */ \
122 }
123
124 /*
125 * Tail queue functions.
126 */
127 #define TAILQ_INIT(head) { \
128 (head)->tqh_first = NULL; \
129 (head)->tqh_last = &(head)->tqh_first; \
130 }
131
132 #define TAILQ_INSERT_HEAD(head, elm, field) { \
133 if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \
134 (elm)->field.tqe_next->field.tqe_prev = \
135 &(elm)->field.tqe_next; \
136 else \
137 (head)->tqh_last = &(elm)->field.tqe_next; \
138 (head)->tqh_first = (elm); \
139 (elm)->field.tqe_prev = &(head)->tqh_first; \
140 }
141
142 #define TAILQ_INSERT_TAIL(head, elm, field) { \
143 (elm)->field.tqe_next = NULL; \
144 (elm)->field.tqe_prev = (head)->tqh_last; \
145 *(head)->tqh_last = (elm); \
146 (head)->tqh_last = &(elm)->field.tqe_next; \
147 }
148
149 #define TAILQ_INSERT_AFTER(head, listelm, elm, field) { \
150 if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
151 (elm)->field.tqe_next->field.tqe_prev = \
152 &(elm)->field.tqe_next; \
153 else \
154 (head)->tqh_last = &(elm)->field.tqe_next; \
155 (listelm)->field.tqe_next = (elm); \
156 (elm)->field.tqe_prev = &(listelm)->field.tqe_next; \
157 }
158
159 #define TAILQ_REMOVE(head, elm, field) { \
160 if (((elm)->field.tqe_next) != NULL) \
161 (elm)->field.tqe_next->field.tqe_prev = \
162 (elm)->field.tqe_prev; \
163 else \
164 (head)->tqh_last = (elm)->field.tqe_prev; \
165 *(elm)->field.tqe_prev = (elm)->field.tqe_next; \
166 }
167
168 /*
169 * Circular queue definitions.
170 */
171 #define CIRCLEQ_HEAD(name, type) \
172 struct name { \
173 struct type *cqh_first; /* first element */ \
174 struct type *cqh_last; /* last element */ \
175 }
176
177 #define CIRCLEQ_ENTRY(type) \
178 struct { \
179 struct type *cqe_next; /* next element */ \
180 struct type *cqe_prev; /* previous element */ \
181 }
182
183 /*
184 * Circular queue functions.
185 */
186 #define CIRCLEQ_INIT(head) { \
187 (head)->cqh_first = (void *)(head); \
188 (head)->cqh_last = (void *)(head); \
189 }
190
191 #define CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) { \
192 (elm)->field.cqe_next = (listelm)->field.cqe_next; \
193 (elm)->field.cqe_prev = (listelm); \
194 if ((listelm)->field.cqe_next == (void *)(head)) \
195 (head)->cqh_last = (elm); \
196 else \
197 (listelm)->field.cqe_next->field.cqe_prev = (elm); \
198 (listelm)->field.cqe_next = (elm); \
199 }
200
201 #define CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) { \
202 (elm)->field.cqe_next = (listelm); \
203 (elm)->field.cqe_prev = (listelm)->field.cqe_prev; \
204 if ((listelm)->field.cqe_prev == (void *)(head)) \
205 (head)->cqh_first = (elm); \
206 else \
207 (listelm)->field.cqe_prev->field.cqe_next = (elm); \
208 (listelm)->field.cqe_prev = (elm); \
209 }
210
211 #define CIRCLEQ_INSERT_HEAD(head, elm, field) { \
212 (elm)->field.cqe_next = (head)->cqh_first; \
213 (elm)->field.cqe_prev = (void *)(head); \
214 if ((head)->cqh_last == (void *)(head)) \
215 (head)->cqh_last = (elm); \
216 else \
217 (head)->cqh_first->field.cqe_prev = (elm); \
218 (head)->cqh_first = (elm); \
219 }
220
221 #define CIRCLEQ_INSERT_TAIL(head, elm, field) { \
222 (elm)->field.cqe_next = (void *)(head); \
223 (elm)->field.cqe_prev = (head)->cqh_last; \
224 if ((head)->cqh_first == (void *)(head)) \
225 (head)->cqh_first = (elm); \
226 else \
227 (head)->cqh_last->field.cqe_next = (elm); \
228 (head)->cqh_last = (elm); \
229 }
230
231 #define CIRCLEQ_REMOVE(head, elm, field) { \
232 if ((elm)->field.cqe_next == (void *)(head)) \
233 (head)->cqh_last = (elm)->field.cqe_prev; \
234 else \
235 (elm)->field.cqe_next->field.cqe_prev = \
236 (elm)->field.cqe_prev; \
237 if ((elm)->field.cqe_prev == (void *)(head)) \
238 (head)->cqh_first = (elm)->field.cqe_next; \
239 else \
240 (elm)->field.cqe_prev->field.cqe_next = \
241 (elm)->field.cqe_next; \
242 }
243 #endif /* !_QUEUE_H_ */
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