/* IBM_PROLOG_BEGIN_TAG                                                   */
/* This is an automatically generated prolog.                             */
/*                                                                        */
/* bos720 src/bos/usr/include/isc/list.h 1.5                              */
/*                                                                        */
/* Licensed Materials - Property of IBM                                   */
/*                                                                        */
/* Restricted Materials of IBM                                            */
/*                                                                        */
/* COPYRIGHT International Business Machines Corp. 1998,2008              */
/* All Rights Reserved                                                    */
/*                                                                        */
/* US Government Users Restricted Rights - Use, duplication or            */
/* disclosure restricted by GSA ADP Schedule Contract with IBM Corp.      */
/*                                                                        */
/* IBM_PROLOG_END_TAG                                                     */
/* aix_sccsid[] = "src/bos/usr/include/isc/list.h, sockinc, bos720 AIX 2/1/08 10:06:23" */
/*
 * Copyright (C) 1997-2001  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
 * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/* $Id: list.h,v 1.18 2001/01/09 21:57:08 bwelling Exp $ */
#ifndef BIND9
/* USE BIND8 */
#ifndef LIST_H
#define LIST_H 1

#define LIST(type) struct { type *head, *tail; }
#define INIT_LIST(list) \
	do { (list).head = NULL; (list).tail = NULL; } while (0)

#define LINK(type) struct { type *prev, *next; }
#define INIT_LINK(elt, link) \
	do { \
		(elt)->link.prev = (void *)(-1); \
		(elt)->link.next = (void *)(-1); \
	} while (0)
#define LINKED(elt, link) ((elt)->link.prev != (void *)(-1))

#define HEAD(list) ((list).head)
#define TAIL(list) ((list).tail)
#define EMPTY(list) ((list).head == NULL)

#define PREPEND(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 APPEND(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 UNLINK(list, elt, link) \
	do { \
		if ((elt)->link.next != NULL) \
			(elt)->link.next->link.prev = (elt)->link.prev; \
		else \
			(list).tail = (elt)->link.prev; \
		if ((elt)->link.prev != NULL) \
			(elt)->link.prev->link.next = (elt)->link.next; \
		else \
			(list).head = (elt)->link.next; \
		INIT_LINK(elt, link); \
	} while (0)

#define PREV(elt, link) ((elt)->link.prev)
#define NEXT(elt, link) ((elt)->link.next)

#define INSERT_BEFORE(list, before, elt, link) \
	do { \
		if ((before)->link.prev == NULL) \
			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 INSERT_AFTER(list, after, elt, link) \
	do { \
		if ((after)->link.next == NULL) \
			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 ENQUEUE(list, elt, link) APPEND(list, elt, link)
#define DEQUEUE(list, elt, link) UNLINK(list, elt, link)

#endif /* LIST_H */

#else
/* USE BIND9 */

#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(elt, link) \
	do { \
		(elt)->link.prev = (void *)(-1); \
		(elt)->link.next = (void *)(-1); \
	} while (0)
#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(list, elt, link) \
	do { \
		if ((elt)->link.next != NULL) \
			(elt)->link.next->link.prev = (elt)->link.prev; \
		else \
			(list).tail = (elt)->link.prev; \
		if ((elt)->link.prev != NULL) \
			(elt)->link.prev->link.next = (elt)->link.next; \
		else \
			(list).head = (elt)->link.next; \
		(elt)->link.prev = (void *)(-1); \
		(elt)->link.next = (void *)(-1); \
	} while (0)

#define ISC_LIST_UNLINK(list, elt, link) \
	do { \
		ISC_LINK_INSIST(ISC_LINK_LINKED(elt, link)); \
		__ISC_LIST_UNLINKUNSAFE(list, elt, link); \
	} while (0)

#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_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(list, elt, link)
#define __ISC_LIST_DEQUEUEUNSAFE(list, elt, link) \
	__ISC_LIST_UNLINKUNSAFE(list, elt, link)

#endif /* ISC_LIST_H */

#endif /* BIND9 */