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* Copyright (C) 1997-2001 Internet Software Consortium.
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
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* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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/* $Id: list.h,v 1.19 2002/05/09 07:09:30 marka Exp $ */
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#include <isc/boolean.h>
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#include <isc/assertions.h>
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#ifdef ISC_LIST_CHECKINIT
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#define ISC_LINK_INSIST(x) ISC_INSIST(x)
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#define ISC_LINK_INSIST(x)
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#define ISC_LIST(type) struct { type *head, *tail; }
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#define ISC_LIST_INIT(list) \
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do { (list).head = NULL; (list).tail = NULL; } while (0)
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#define ISC_LINK(type) struct { type *prev, *next; }
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#define ISC_LINK_INIT_TYPE(elt, link, type) \
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(elt)->link.prev = (type *)(-1); \
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(elt)->link.next = (type *)(-1); \
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#define ISC_LINK_INIT(elt, link) \
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ISC_LINK_INIT_TYPE(elt, link, void)
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#define ISC_LINK_LINKED(elt, link) ((void *)((elt)->link.prev) != (void *)(-1))
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#define ISC_LIST_HEAD(list) ((list).head)
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#define ISC_LIST_TAIL(list) ((list).tail)
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#define ISC_LIST_EMPTY(list) ISC_TF((list).head == NULL)
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#define __ISC_LIST_PREPENDUNSAFE(list, elt, link) \
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if ((list).head != NULL) \
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(list).head->link.prev = (elt); \
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(list).tail = (elt); \
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(elt)->link.prev = NULL; \
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(elt)->link.next = (list).head; \
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(list).head = (elt); \
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#define ISC_LIST_PREPEND(list, elt, link) \
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ISC_LINK_INSIST(!ISC_LINK_LINKED(elt, link)); \
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__ISC_LIST_PREPENDUNSAFE(list, elt, link); \
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#define ISC_LIST_INITANDPREPEND(list, elt, link) \
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__ISC_LIST_PREPENDUNSAFE(list, elt, link)
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#define __ISC_LIST_APPENDUNSAFE(list, elt, link) \
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if ((list).tail != NULL) \
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(list).tail->link.next = (elt); \
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(list).head = (elt); \
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(elt)->link.prev = (list).tail; \
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(elt)->link.next = NULL; \
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(list).tail = (elt); \
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#define ISC_LIST_APPEND(list, elt, link) \
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ISC_LINK_INSIST(!ISC_LINK_LINKED(elt, link)); \
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__ISC_LIST_APPENDUNSAFE(list, elt, link); \
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#define ISC_LIST_INITANDAPPEND(list, elt, link) \
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__ISC_LIST_APPENDUNSAFE(list, elt, link)
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#define __ISC_LIST_UNLINKUNSAFE_TYPE(list, elt, link, type) \
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if ((elt)->link.next != NULL) \
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(elt)->link.next->link.prev = (elt)->link.prev; \
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(list).tail = (elt)->link.prev; \
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if ((elt)->link.prev != NULL) \
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(elt)->link.prev->link.next = (elt)->link.next; \
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(list).head = (elt)->link.next; \
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(elt)->link.prev = (type *)(-1); \
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(elt)->link.next = (type *)(-1); \
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#define __ISC_LIST_UNLINKUNSAFE(list, elt, link) \
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__ISC_LIST_UNLINKUNSAFE_TYPE(list, elt, link, void)
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#define ISC_LIST_UNLINK_TYPE(list, elt, link, type) \
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ISC_LINK_INSIST(ISC_LINK_LINKED(elt, link)); \
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__ISC_LIST_UNLINKUNSAFE_TYPE(list, elt, link, type); \
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#define ISC_LIST_UNLINK(list, elt, link) \
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ISC_LIST_UNLINK_TYPE(list, elt, link, void)
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#define ISC_LIST_PREV(elt, link) ((elt)->link.prev)
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#define ISC_LIST_NEXT(elt, link) ((elt)->link.next)
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#define __ISC_LIST_INSERTBEFOREUNSAFE(list, before, elt, link) \
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if ((before)->link.prev == NULL) \
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ISC_LIST_PREPEND(list, elt, link); \
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(elt)->link.prev = (before)->link.prev; \
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(before)->link.prev = (elt); \
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(elt)->link.prev->link.next = (elt); \
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(elt)->link.next = (before); \
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#define ISC_LIST_INSERTBEFORE(list, before, elt, link) \
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ISC_LINK_INSIST(ISC_LINK_LINKED(before, link)); \
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ISC_LINK_INSIST(!ISC_LINK_LINKED(elt, link)); \
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__ISC_LIST_INSERTBEFOREUNSAFE(list, before, elt, link); \
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#define __ISC_LIST_INSERTAFTERUNSAFE(list, after, elt, link) \
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if ((after)->link.next == NULL) \
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ISC_LIST_APPEND(list, elt, link); \
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(elt)->link.next = (after)->link.next; \
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(after)->link.next = (elt); \
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(elt)->link.next->link.prev = (elt); \
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(elt)->link.prev = (after); \
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#define ISC_LIST_INSERTAFTER(list, after, elt, link) \
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ISC_LINK_INSIST(ISC_LINK_LINKED(after, link)); \
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ISC_LINK_INSIST(!ISC_LINK_LINKED(elt, link)); \
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__ISC_LIST_INSERTAFTERUNSAFE(list, after, elt, link); \
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#define ISC_LIST_APPENDLIST(list1, list2, link) \
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if (ISC_LIST_EMPTY(list1)) \
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else if (!ISC_LIST_EMPTY(list2)) { \
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(list1).tail->link.next = (list2).head; \
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(list2).head->link.prev = (list1).tail; \
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(list1).tail = (list2).tail; \
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(list2).head = NULL; \
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(list2).tail = NULL; \
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#define ISC_LIST_ENQUEUE(list, elt, link) ISC_LIST_APPEND(list, elt, link)
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#define __ISC_LIST_ENQUEUEUNSAFE(list, elt, link) \
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__ISC_LIST_APPENDUNSAFE(list, elt, link)
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#define ISC_LIST_DEQUEUE(list, elt, link) \
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ISC_LIST_UNLINK_TYPE(list, elt, link, void)
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#define ISC_LIST_DEQUEUE_TYPE(list, elt, link, type) \
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ISC_LIST_UNLINK_TYPE(list, elt, link, type)
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#define __ISC_LIST_DEQUEUEUNSAFE(list, elt, link) \
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__ISC_LIST_UNLINKUNSAFE_TYPE(list, elt, link, void)
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#define __ISC_LIST_DEQUEUEUNSAFE_TYPE(list, elt, link, type) \
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__ISC_LIST_UNLINKUNSAFE_TYPE(list, elt, link, type)
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#endif /* ISC_LIST_H */