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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef ISC_LIST_H
#define ISC_LIST_H 1
#include <isc/boolean.h>
#include <isc/assertions.h>
#ifdef ISC_LIST_CHECKINIT
#define ISC_LINK_INSIST(x) ISC_INSIST(x)
#else
#define ISC_LINK_INSIST(x)
#endif
#define ISC_LIST(type) struct { type *head, *tail; }
#define ISC_LIST_INIT(list) \
do { (list).head = NULL; (list).tail = NULL; } while (0)
#define ISC_LINK(type) struct { type *prev, *next; }
#define ISC_LINK_INIT_TYPE(elt, link, type) \
do { \
(elt)->link.prev = (type *)(-1); \
(elt)->link.next = (type *)(-1); \
} while (0)
#define ISC_LINK_INIT(elt, link) \
ISC_LINK_INIT_TYPE(elt, link, void)
#define ISC_LINK_LINKED(elt, link) ((void *)((elt)->link.prev) != (void *)(-1))
#define ISC_LIST_HEAD(list) ((list).head)
#define ISC_LIST_TAIL(list) ((list).tail)
#define ISC_LIST_EMPTY(list) ISC_TF((list).head == NULL)
#define __ISC_LIST_PREPENDUNSAFE(list, elt, link) \
do { \
if ((list).head != NULL) \
(list).head->link.prev = (elt); \
else \
(list).tail = (elt); \
(elt)->link.prev = NULL; \
(elt)->link.next = (list).head; \
(list).head = (elt); \
} while (0)
#define ISC_LIST_PREPEND(list, elt, link) \
do { \
ISC_LINK_INSIST(!ISC_LINK_LINKED(elt, link)); \
__ISC_LIST_PREPENDUNSAFE(list, elt, link); \
} while (0)
#define ISC_LIST_INITANDPREPEND(list, elt, link) \
__ISC_LIST_PREPENDUNSAFE(list, elt, link)
#define __ISC_LIST_APPENDUNSAFE(list, elt, link) \
do { \
if ((list).tail != NULL) \
(list).tail->link.next = (elt); \
else \
(list).head = (elt); \
(elt)->link.prev = (list).tail; \
(elt)->link.next = NULL; \
(list).tail = (elt); \
} while (0)
#define ISC_LIST_APPEND(list, elt, link) \
do { \
ISC_LINK_INSIST(!ISC_LINK_LINKED(elt, link)); \
__ISC_LIST_APPENDUNSAFE(list, elt, link); \
} while (0)
#define ISC_LIST_INITANDAPPEND(list, elt, link) \
__ISC_LIST_APPENDUNSAFE(list, elt, link)
#define __ISC_LIST_UNLINKUNSAFE_TYPE(list, elt, link, type) \
do { \
if ((elt)->link.next != NULL) \
(elt)->link.next->link.prev = (elt)->link.prev; \
else { \
ISC_INSIST((list).tail == (elt)); \
(list).tail = (elt)->link.prev; \
} \
if ((elt)->link.prev != NULL) \
(elt)->link.prev->link.next = (elt)->link.next; \
else { \
ISC_INSIST((list).head == (elt)); \
(list).head = (elt)->link.next; \
} \
(elt)->link.prev = (type *)(-1); \
(elt)->link.next = (type *)(-1); \
ISC_INSIST((list).head != (elt)); \
ISC_INSIST((list).tail != (elt)); \
} while (0)
#define __ISC_LIST_UNLINKUNSAFE(list, elt, link) \
__ISC_LIST_UNLINKUNSAFE_TYPE(list, elt, link, void)
#define ISC_LIST_UNLINK_TYPE(list, elt, link, type) \
do { \
ISC_LINK_INSIST(ISC_LINK_LINKED(elt, link)); \
__ISC_LIST_UNLINKUNSAFE_TYPE(list, elt, link, type); \
} while (0)
#define ISC_LIST_UNLINK(list, elt, link) \
ISC_LIST_UNLINK_TYPE(list, elt, link, void)
#define ISC_LIST_PREV(elt, link) ((elt)->link.prev)
#define ISC_LIST_NEXT(elt, link) ((elt)->link.next)
#define __ISC_LIST_INSERTBEFOREUNSAFE(list, before, elt, link) \
do { \
if ((before)->link.prev == NULL) \
ISC_LIST_PREPEND(list, elt, link); \
else { \
(elt)->link.prev = (before)->link.prev; \
(before)->link.prev = (elt); \
(elt)->link.prev->link.next = (elt); \
(elt)->link.next = (before); \
} \
} while (0)
#define ISC_LIST_INSERTBEFORE(list, before, elt, link) \
do { \
ISC_LINK_INSIST(ISC_LINK_LINKED(before, link)); \
ISC_LINK_INSIST(!ISC_LINK_LINKED(elt, link)); \
__ISC_LIST_INSERTBEFOREUNSAFE(list, before, elt, link); \
} while (0)
#define __ISC_LIST_INSERTAFTERUNSAFE(list, after, elt, link) \
do { \
if ((after)->link.next == NULL) \
ISC_LIST_APPEND(list, elt, link); \
else { \
(elt)->link.next = (after)->link.next; \
(after)->link.next = (elt); \
(elt)->link.next->link.prev = (elt); \
(elt)->link.prev = (after); \
} \
} while (0)
#define ISC_LIST_INSERTAFTER(list, after, elt, link) \
do { \
ISC_LINK_INSIST(ISC_LINK_LINKED(after, link)); \
ISC_LINK_INSIST(!ISC_LINK_LINKED(elt, link)); \
__ISC_LIST_INSERTAFTERUNSAFE(list, after, elt, link); \
} while (0)
#define ISC_LIST_APPENDLIST(list1, list2, link) \
do { \
if (ISC_LIST_EMPTY(list1)) \
(list1) = (list2); \
else if (!ISC_LIST_EMPTY(list2)) { \
(list1).tail->link.next = (list2).head; \
(list2).head->link.prev = (list1).tail; \
(list1).tail = (list2).tail; \
} \
(list2).head = NULL; \
(list2).tail = NULL; \
} while (0)
#define ISC_LIST_PREPENDLIST(list1, list2, link) \
do { \
if (ISC_LIST_EMPTY(list1)) \
(list1) = (list2); \
else if (!ISC_LIST_EMPTY(list2)) { \
(list2).tail->link.next = (list1).head; \
(list1).head->link.prev = (list2).tail; \
(list1).head = (list2).head; \
} \
(list2).head = NULL; \
(list2).tail = NULL; \
} while (0)
#define ISC_LIST_ENQUEUE(list, elt, link) ISC_LIST_APPEND(list, elt, link)
#define __ISC_LIST_ENQUEUEUNSAFE(list, elt, link) \
__ISC_LIST_APPENDUNSAFE(list, elt, link)
#define ISC_LIST_DEQUEUE(list, elt, link) \
ISC_LIST_UNLINK_TYPE(list, elt, link, void)
#define ISC_LIST_DEQUEUE_TYPE(list, elt, link, type) \
ISC_LIST_UNLINK_TYPE(list, elt, link, type)
#define __ISC_LIST_DEQUEUEUNSAFE(list, elt, link) \
__ISC_LIST_UNLINKUNSAFE_TYPE(list, elt, link, void)
#define __ISC_LIST_DEQUEUEUNSAFE_TYPE(list, elt, link, type) \
__ISC_LIST_UNLINKUNSAFE_TYPE(list, elt, link, type)
#endif /* ISC_LIST_H */