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Diffstat (limited to 'include/ldap_queue.h')
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diff --git a/include/ldap_queue.h b/include/ldap_queue.h new file mode 100644 index 0000000..ab155dd --- /dev/null +++ b/include/ldap_queue.h @@ -0,0 +1,556 @@ +/* ldap_queue.h -- queue macros */ +/* $OpenLDAP$ */ +/* This work is part of OpenLDAP Software <http://www.openldap.org/>. + * + * Copyright 2001-2021 The OpenLDAP Foundation. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted only as authorized by the OpenLDAP + * Public License. + * + * A copy of this license is available in file LICENSE in the + * top-level directory of the distribution or, alternatively, at + * <http://www.OpenLDAP.org/license.html>. + */ +/* Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)queue.h 8.5 (Berkeley) 8/20/94 + * $FreeBSD: src/sys/sys/queue.h,v 1.32.2.5 2001/09/30 21:12:54 luigi Exp $ + * + * See also: ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change + */ +/* ACKNOWLEDGEMENTS: + * This work is derived from FreeBSD queue.h work. Adapted for use in + * OpenLDAP Software by Kurt D. Zeilenga. + */ + +#ifndef _LDAP_QUEUE_H_ +#define _LDAP_QUEUE_H_ + +/* + * This file defines five types of data structures: singly-linked lists, + * singly-linked tail queues, lists, tail queues, and circular queues. + * + * A singly-linked list is headed by a single forward pointer. The elements + * are singly linked for minimum space and pointer manipulation overhead at + * the expense of O(n) removal for arbitrary elements. New elements can be + * added to the list after an existing element or at the head of the list. + * Elements being removed from the head of the list should use the explicit + * macro for this purpose for optimum efficiency. A singly-linked list may + * only be traversed in the forward direction. Singly-linked lists are ideal + * for applications with large datasets and few or no removals or for + * implementing a LIFO queue. + * + * A singly-linked tail queue is headed by a pair of pointers, one to the + * head of the list and the other to the tail of the list. The elements are + * singly linked for minimum space and pointer manipulation overhead at the + * expense of O(n) removal for arbitrary elements. New elements can be added + * to the list after an existing element, at the head of the list, or at the + * end of the list. Elements being removed from the head of the tail queue + * should use the explicit macro for this purpose for optimum efficiency. + * A singly-linked tail queue may only be traversed in the forward direction. + * Singly-linked tail queues are ideal for applications with large datasets + * and few or no removals or for implementing a FIFO queue. + * + * A list is headed by a single forward pointer (or an array of forward + * pointers for a hash table header). The elements are doubly linked + * so that an arbitrary element can be removed without a need to + * traverse the list. New elements can be added to the list before + * or after an existing element or at the head of the list. A list + * may only be traversed in the forward direction. + * + * A tail queue is headed by a pair of pointers, one to the head of the + * list and the other to the tail of the list. The elements are doubly + * linked so that an arbitrary element can be removed without a need to + * traverse the list. New elements can be added to the list before or + * after an existing element, at the head of the list, or at the end of + * the list. A tail queue may be traversed in either direction. + * + * A circle queue is headed by a pair of pointers, one to the head of the + * list and the other to the tail of the list. The elements are doubly + * linked so that an arbitrary element can be removed without a need to + * traverse the list. New elements can be added to the list before or after + * an existing element, at the head of the list, or at the end of the list. + * A circle queue may be traversed in either direction, but has a more + * complex end of list detection. + * + * For details on the use of these macros, see the queue(3) manual page. + * All macros are prefixed with LDAP_. + * + * SLIST_ LIST_ STAILQ_ TAILQ_ CIRCLEQ_ + * _HEAD + + + + + + * _ENTRY + + + + + + * _INIT + + + + + + * _ENTRY_INIT + + + + + + * _EMPTY + + + + + + * _FIRST + + + + + + * _NEXT + + + + + + * _PREV - - - + + + * _LAST - - + + + + * _FOREACH + + + + + + * _FOREACH_REVERSE - - - + + + * _INSERT_HEAD + + + + + + * _INSERT_BEFORE - + - + + + * _INSERT_AFTER + + + + + + * _INSERT_TAIL - - + + + + * _REMOVE_HEAD + - + - - + * _REMOVE + + + + + + * + */ + +/* + * Singly-linked List definitions. + */ +#define LDAP_SLIST_HEAD(name, type) \ +struct name { \ + struct type *slh_first; /* first element */ \ +} + +#define LDAP_SLIST_HEAD_INITIALIZER(head) \ + { NULL } + +#define LDAP_SLIST_ENTRY(type) \ +struct { \ + struct type *sle_next; /* next element */ \ +} + +#define LDAP_SLIST_ENTRY_INITIALIZER(entry) \ + { NULL } + +/* + * Singly-linked List functions. + */ +#define LDAP_SLIST_EMPTY(head) ((head)->slh_first == NULL) + +#define LDAP_SLIST_FIRST(head) ((head)->slh_first) + +#define LDAP_SLIST_FOREACH(var, head, field) \ + for((var) = (head)->slh_first; (var); (var) = (var)->field.sle_next) + +#define LDAP_SLIST_INIT(head) { \ + (head)->slh_first = NULL; \ +} + +#define LDAP_SLIST_ENTRY_INIT(var, field) { \ + (var)->field.sle_next = NULL; \ +} + +#define LDAP_SLIST_INSERT_AFTER(slistelm, elm, field) do { \ + (elm)->field.sle_next = (slistelm)->field.sle_next; \ + (slistelm)->field.sle_next = (elm); \ +} while (0) + +#define LDAP_SLIST_INSERT_HEAD(head, elm, field) do { \ + (elm)->field.sle_next = (head)->slh_first; \ + (head)->slh_first = (elm); \ +} while (0) + +#define LDAP_SLIST_NEXT(elm, field) ((elm)->field.sle_next) + +#define LDAP_SLIST_REMOVE_HEAD(head, field) do { \ + (head)->slh_first = (head)->slh_first->field.sle_next; \ +} while (0) + +#define LDAP_SLIST_REMOVE(head, elm, type, field) do { \ + if ((head)->slh_first == (elm)) { \ + LDAP_SLIST_REMOVE_HEAD((head), field); \ + } \ + else { \ + struct type *curelm = (head)->slh_first; \ + while( curelm->field.sle_next != (elm) ) \ + curelm = curelm->field.sle_next; \ + curelm->field.sle_next = \ + curelm->field.sle_next->field.sle_next; \ + } \ +} while (0) + +/* + * Singly-linked Tail queue definitions. + */ +#define LDAP_STAILQ_HEAD(name, type) \ +struct name { \ + struct type *stqh_first;/* first element */ \ + struct type **stqh_last;/* addr of last next element */ \ +} + +#define LDAP_STAILQ_HEAD_INITIALIZER(head) \ + { NULL, &(head).stqh_first } + +#define LDAP_STAILQ_ENTRY(type) \ +struct { \ + struct type *stqe_next; /* next element */ \ +} + +#define LDAP_STAILQ_ENTRY_INITIALIZER(entry) \ + { NULL } + +/* + * Singly-linked Tail queue functions. + */ +#define LDAP_STAILQ_EMPTY(head) ((head)->stqh_first == NULL) + +#define LDAP_STAILQ_INIT(head) do { \ + (head)->stqh_first = NULL; \ + (head)->stqh_last = &(head)->stqh_first; \ +} while (0) + +#define LDAP_STAILQ_ENTRY_INIT(var, field) { \ + (var)->field.stqe_next = NULL; \ +} + +#define LDAP_STAILQ_FIRST(head) ((head)->stqh_first) + +#define LDAP_STAILQ_LAST(head, type, field) \ + (LDAP_STAILQ_EMPTY(head) ? \ + NULL : \ + ((struct type *) \ + ((char *)((head)->stqh_last) - offsetof(struct type, field)))) + +#define LDAP_STAILQ_FOREACH(var, head, field) \ + for((var) = (head)->stqh_first; (var); (var) = (var)->field.stqe_next) + +#define LDAP_STAILQ_INSERT_HEAD(head, elm, field) do { \ + if (((elm)->field.stqe_next = (head)->stqh_first) == NULL) \ + (head)->stqh_last = &(elm)->field.stqe_next; \ + (head)->stqh_first = (elm); \ +} while (0) + +#define LDAP_STAILQ_INSERT_TAIL(head, elm, field) do { \ + (elm)->field.stqe_next = NULL; \ + *(head)->stqh_last = (elm); \ + (head)->stqh_last = &(elm)->field.stqe_next; \ +} while (0) + +#define LDAP_STAILQ_INSERT_AFTER(head, tqelm, elm, field) do { \ + if (((elm)->field.stqe_next = (tqelm)->field.stqe_next) == NULL)\ + (head)->stqh_last = &(elm)->field.stqe_next; \ + (tqelm)->field.stqe_next = (elm); \ +} while (0) + +#define LDAP_STAILQ_NEXT(elm, field) ((elm)->field.stqe_next) + +#define LDAP_STAILQ_REMOVE_HEAD(head, field) do { \ + if (((head)->stqh_first = \ + (head)->stqh_first->field.stqe_next) == NULL) \ + (head)->stqh_last = &(head)->stqh_first; \ +} while (0) + +#define LDAP_STAILQ_REMOVE_HEAD_UNTIL(head, elm, field) do { \ + if (((head)->stqh_first = (elm)->field.stqe_next) == NULL) \ + (head)->stqh_last = &(head)->stqh_first; \ +} while (0) + +#define LDAP_STAILQ_REMOVE(head, elm, type, field) do { \ + if ((head)->stqh_first == (elm)) { \ + LDAP_STAILQ_REMOVE_HEAD(head, field); \ + } \ + else { \ + struct type *curelm = (head)->stqh_first; \ + while( curelm->field.stqe_next != (elm) ) \ + curelm = curelm->field.stqe_next; \ + if((curelm->field.stqe_next = \ + curelm->field.stqe_next->field.stqe_next) == NULL) \ + (head)->stqh_last = &(curelm)->field.stqe_next; \ + } \ +} while (0) + +/* + * List definitions. + */ +#define LDAP_LIST_HEAD(name, type) \ +struct name { \ + struct type *lh_first; /* first element */ \ +} + +#define LDAP_LIST_HEAD_INITIALIZER(head) \ + { NULL } + +#define LDAP_LIST_ENTRY(type) \ +struct { \ + struct type *le_next; /* next element */ \ + struct type **le_prev; /* address of previous next element */ \ +} + +#define LDAP_LIST_ENTRY_INITIALIZER(entry) \ + { NULL, NULL } + +/* + * List functions. + */ + +#define LDAP_LIST_EMPTY(head) ((head)->lh_first == NULL) + +#define LDAP_LIST_FIRST(head) ((head)->lh_first) + +#define LDAP_LIST_FOREACH(var, head, field) \ + for((var) = (head)->lh_first; (var); (var) = (var)->field.le_next) + +#define LDAP_LIST_INIT(head) do { \ + (head)->lh_first = NULL; \ +} while (0) + +#define LDAP_LIST_ENTRY_INIT(var, field) do { \ + (var)->field.le_next = NULL; \ + (var)->field.le_prev = NULL; \ +} while (0) + +#define LDAP_LIST_INSERT_AFTER(listelm, elm, field) do { \ + if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \ + (listelm)->field.le_next->field.le_prev = \ + &(elm)->field.le_next; \ + (listelm)->field.le_next = (elm); \ + (elm)->field.le_prev = &(listelm)->field.le_next; \ +} while (0) + +#define LDAP_LIST_INSERT_BEFORE(listelm, elm, field) do { \ + (elm)->field.le_prev = (listelm)->field.le_prev; \ + (elm)->field.le_next = (listelm); \ + *(listelm)->field.le_prev = (elm); \ + (listelm)->field.le_prev = &(elm)->field.le_next; \ +} while (0) + +#define LDAP_LIST_INSERT_HEAD(head, elm, field) do { \ + if (((elm)->field.le_next = (head)->lh_first) != NULL) \ + (head)->lh_first->field.le_prev = &(elm)->field.le_next;\ + (head)->lh_first = (elm); \ + (elm)->field.le_prev = &(head)->lh_first; \ +} while (0) + +#define LDAP_LIST_NEXT(elm, field) ((elm)->field.le_next) + +#define LDAP_LIST_REMOVE(elm, field) do { \ + if ((elm)->field.le_next != NULL) \ + (elm)->field.le_next->field.le_prev = \ + (elm)->field.le_prev; \ + *(elm)->field.le_prev = (elm)->field.le_next; \ +} while (0) + +/* + * Tail queue definitions. + */ +#define LDAP_TAILQ_HEAD(name, type) \ +struct name { \ + struct type *tqh_first; /* first element */ \ + struct type **tqh_last; /* addr of last next element */ \ +} + +#define LDAP_TAILQ_HEAD_INITIALIZER(head) \ + { NULL, &(head).tqh_first } + +#define LDAP_TAILQ_ENTRY(type) \ +struct { \ + struct type *tqe_next; /* next element */ \ + struct type **tqe_prev; /* address of previous next element */ \ +} + +#define LDAP_TAILQ_ENTRY_INITIALIZER(entry) \ + { NULL, NULL } + +/* + * Tail queue functions. + */ +#define LDAP_TAILQ_EMPTY(head) ((head)->tqh_first == NULL) + +#define LDAP_TAILQ_FOREACH(var, head, field) \ + for (var = LDAP_TAILQ_FIRST(head); var; var = LDAP_TAILQ_NEXT(var, field)) + +#define LDAP_TAILQ_FOREACH_REVERSE(var, head, headname, field) \ + for ((var) = LDAP_TAILQ_LAST((head), headname); \ + (var); \ + (var) = LDAP_TAILQ_PREV((var), headname, field)) + +#define LDAP_TAILQ_FIRST(head) ((head)->tqh_first) + +#define LDAP_TAILQ_LAST(head, headname) \ + (*(((struct headname *)((head)->tqh_last))->tqh_last)) + +#define LDAP_TAILQ_NEXT(elm, field) ((elm)->field.tqe_next) + +#define LDAP_TAILQ_PREV(elm, headname, field) \ + (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last)) + +#define LDAP_TAILQ_INIT(head) do { \ + (head)->tqh_first = NULL; \ + (head)->tqh_last = &(head)->tqh_first; \ +} while (0) + +#define LDAP_TAILQ_ENTRY_INIT(var, field) do { \ + (var)->field.tqe_next = NULL; \ + (var)->field.tqe_prev = NULL; \ +} while (0) + +#define LDAP_TAILQ_INSERT_HEAD(head, elm, field) do { \ + if (((elm)->field.tqe_next = (head)->tqh_first) != NULL) \ + (head)->tqh_first->field.tqe_prev = \ + &(elm)->field.tqe_next; \ + else \ + (head)->tqh_last = &(elm)->field.tqe_next; \ + (head)->tqh_first = (elm); \ + (elm)->field.tqe_prev = &(head)->tqh_first; \ +} while (0) + +#define LDAP_TAILQ_INSERT_TAIL(head, elm, field) do { \ + (elm)->field.tqe_next = NULL; \ + (elm)->field.tqe_prev = (head)->tqh_last; \ + *(head)->tqh_last = (elm); \ + (head)->tqh_last = &(elm)->field.tqe_next; \ +} while (0) + +#define LDAP_TAILQ_INSERT_AFTER(head, listelm, elm, field) do { \ + if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\ + (elm)->field.tqe_next->field.tqe_prev = \ + &(elm)->field.tqe_next; \ + else \ + (head)->tqh_last = &(elm)->field.tqe_next; \ + (listelm)->field.tqe_next = (elm); \ + (elm)->field.tqe_prev = &(listelm)->field.tqe_next; \ +} while (0) + +#define LDAP_TAILQ_INSERT_BEFORE(listelm, elm, field) do { \ + (elm)->field.tqe_prev = (listelm)->field.tqe_prev; \ + (elm)->field.tqe_next = (listelm); \ + *(listelm)->field.tqe_prev = (elm); \ + (listelm)->field.tqe_prev = &(elm)->field.tqe_next; \ +} while (0) + +#define LDAP_TAILQ_REMOVE(head, elm, field) do { \ + if (((elm)->field.tqe_next) != NULL) \ + (elm)->field.tqe_next->field.tqe_prev = \ + (elm)->field.tqe_prev; \ + else \ + (head)->tqh_last = (elm)->field.tqe_prev; \ + *(elm)->field.tqe_prev = (elm)->field.tqe_next; \ +} while (0) + +/* + * Circular queue definitions. + */ +#define LDAP_CIRCLEQ_HEAD(name, type) \ +struct name { \ + struct type *cqh_first; /* first element */ \ + struct type *cqh_last; /* last element */ \ +} + +#define LDAP_CIRCLEQ_ENTRY(type) \ +struct { \ + struct type *cqe_next; /* next element */ \ + struct type *cqe_prev; /* previous element */ \ +} + +/* + * Circular queue functions. + */ +#define LDAP_CIRCLEQ_EMPTY(head) ((head)->cqh_first == (void *)(head)) + +#define LDAP_CIRCLEQ_FIRST(head) ((head)->cqh_first) + +#define LDAP_CIRCLEQ_FOREACH(var, head, field) \ + for((var) = (head)->cqh_first; \ + (var) != (void *)(head); \ + (var) = (var)->field.cqe_next) + +#define LDAP_CIRCLEQ_FOREACH_REVERSE(var, head, field) \ + for((var) = (head)->cqh_last; \ + (var) != (void *)(head); \ + (var) = (var)->field.cqe_prev) + +#define LDAP_CIRCLEQ_INIT(head) do { \ + (head)->cqh_first = (void *)(head); \ + (head)->cqh_last = (void *)(head); \ +} while (0) + +#define LDAP_CIRCLEQ_ENTRY_INIT(var, field) do { \ + (var)->field.cqe_next = NULL; \ + (var)->field.cqe_prev = NULL; \ +} while (0) + +#define LDAP_CIRCLEQ_INSERT_AFTER(head, listelm, elm, field) do { \ + (elm)->field.cqe_next = (listelm)->field.cqe_next; \ + (elm)->field.cqe_prev = (listelm); \ + if ((listelm)->field.cqe_next == (void *)(head)) \ + (head)->cqh_last = (elm); \ + else \ + (listelm)->field.cqe_next->field.cqe_prev = (elm); \ + (listelm)->field.cqe_next = (elm); \ +} while (0) + +#define LDAP_CIRCLEQ_INSERT_BEFORE(head, listelm, elm, field) do { \ + (elm)->field.cqe_next = (listelm); \ + (elm)->field.cqe_prev = (listelm)->field.cqe_prev; \ + if ((listelm)->field.cqe_prev == (void *)(head)) \ + (head)->cqh_first = (elm); \ + else \ + (listelm)->field.cqe_prev->field.cqe_next = (elm); \ + (listelm)->field.cqe_prev = (elm); \ +} while (0) + +#define LDAP_CIRCLEQ_INSERT_HEAD(head, elm, field) do { \ + (elm)->field.cqe_next = (head)->cqh_first; \ + (elm)->field.cqe_prev = (void *)(head); \ + if ((head)->cqh_last == (void *)(head)) \ + (head)->cqh_last = (elm); \ + else \ + (head)->cqh_first->field.cqe_prev = (elm); \ + (head)->cqh_first = (elm); \ +} while (0) + +#define LDAP_CIRCLEQ_INSERT_TAIL(head, elm, field) do { \ + (elm)->field.cqe_next = (void *)(head); \ + (elm)->field.cqe_prev = (head)->cqh_last; \ + if ((head)->cqh_first == (void *)(head)) \ + (head)->cqh_first = (elm); \ + else \ + (head)->cqh_last->field.cqe_next = (elm); \ + (head)->cqh_last = (elm); \ +} while (0) + +#define LDAP_CIRCLEQ_LAST(head) ((head)->cqh_last) + +#define LDAP_CIRCLEQ_NEXT(elm,field) ((elm)->field.cqe_next) + +#define LDAP_CIRCLEQ_PREV(elm,field) ((elm)->field.cqe_prev) + +#define LDAP_CIRCLEQ_REMOVE(head, elm, field) do { \ + if ((elm)->field.cqe_next == (void *)(head)) \ + (head)->cqh_last = (elm)->field.cqe_prev; \ + else \ + (elm)->field.cqe_next->field.cqe_prev = \ + (elm)->field.cqe_prev; \ + if ((elm)->field.cqe_prev == (void *)(head)) \ + (head)->cqh_first = (elm)->field.cqe_next; \ + else \ + (elm)->field.cqe_prev->field.cqe_next = \ + (elm)->field.cqe_next; \ +} while (0) + +#endif /* !_LDAP_QUEUE_H_ */ |