/*	$NetBSD: queue.h,v 1.9 2015/12/13 21:56:27 joerg Exp $	*/

/*
 * 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
 */

#ifndef _NBCOMPAT_QUEUE_H
#define _NBCOMPAT_QUEUE_H

#if HAVE_SYS_QUEUE_H
# include <sys/queue.h>
#endif

/*
 * Provide any macros missing from <sys/queue.h>.
 */

#ifndef LIST_HEAD
#define LIST_HEAD(name, type)						\
struct name {								\
	struct type *lh_first;	/* first element */			\
}
#endif

#ifndef LIST_HEAD_INITIALIZER
#define LIST_HEAD_INITIALIZER(head)					\
	{ NULL }
#endif

#ifndef LIST_ENTRY
#define LIST_ENTRY(type)						\
struct {								\
	struct type *le_next;	/* next element */			\
	struct type **le_prev;	/* address of previous next element */	\
}
#endif

#ifndef LIST_INIT
#define	LIST_INIT(head) do {						\
	(head)->lh_first = NULL;					\
} while (/*CONSTCOND*/0)
#endif

#ifndef LIST_INSERT_AFTER
#define	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 (/*CONSTCOND*/0)
#endif

#ifndef LIST_INSERT_BEFORE
#define	LIST_INSERT_BEFORE(listelm, elm, field) do {			\
	QUEUEDEBUG_LIST_OP((listelm), field)				\
	(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 (/*CONSTCOND*/0)
#endif

#ifndef LIST_INSERT_HEAD
#define 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 (/*CONSTCOND*/0)
#endif

#ifndef LIST_REMOVE
#define	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 (/*CONSTCOND*/0)
#endif

#ifndef LIST_FOREACH
#define	LIST_FOREACH(var, head, field)					\
	for ((var) = ((head)->lh_first);				\
		(var);							\
		(var) = ((var)->field.le_next))
#endif

#ifndef LIST_EMPTY
#define	LIST_EMPTY(head)		((head)->lh_first == NULL)
#endif
#ifndef LIST_FIRST
#define	LIST_FIRST(head)		((head)->lh_first)
#endif
#ifndef LIST_NEXT
#define	LIST_NEXT(elm, field)		((elm)->field.le_next)
#endif

#ifndef SLIST_HEAD
#define	SLIST_HEAD(name, type)						\
struct name {								\
	struct type *slh_first;	/* first element */			\
}
#endif

#ifndef SLIST_HEAD_INITIALIZER
#define	SLIST_HEAD_INITIALIZER(head)					\
	{ NULL }
#endif

#ifndef SLIST_ENTRY
#define	SLIST_ENTRY(type)						\
struct {								\
	struct type *sle_next;	/* next element */			\
}
#endif

#ifndef SLIST_INIT
#define	SLIST_INIT(head) do {						\
	(head)->slh_first = NULL;					\
} while (/*CONSTCOND*/0)
#endif

#ifndef SLIST_INSERT_AFTER
#define	SLIST_INSERT_AFTER(slistelm, elm, field) do {			\
	(elm)->field.sle_next = (slistelm)->field.sle_next;		\
	(slistelm)->field.sle_next = (elm);				\
} while (/*CONSTCOND*/0)
#endif

#ifndef SLIST_INSERT_HEAD
#define	SLIST_INSERT_HEAD(head, elm, field) do {			\
	(elm)->field.sle_next = (head)->slh_first;			\
	(head)->slh_first = (elm);					\
} while (/*CONSTCOND*/0)
#endif

#ifndef SLIST_REMOVE_HEAD
#define	SLIST_REMOVE_HEAD(head, field) do {				\
	(head)->slh_first = (head)->slh_first->field.sle_next;		\
} while (/*CONSTCOND*/0)
#endif

#ifndef SLIST_REMOVE
#define	SLIST_REMOVE(head, elm, type, field) do {			\
	if ((head)->slh_first == (elm)) {				\
		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 (/*CONSTCOND*/0)
#endif

#ifndef SLIST_REMOVE_AFTER
#define	SLIST_REMOVE_AFTER(slistelm, field) do {			\
	(slistelm)->field.sle_next =					\
	    SLIST_NEXT(SLIST_NEXT((slistelm), field), field);		\
} while (/*CONSTCOND*/0)
#endif

#ifndef SLIST_FOREACH
#define	SLIST_FOREACH(var, head, field)					\
	for((var) = (head)->slh_first; (var); (var) = (var)->field.sle_next)
#endif

#ifndef SLIST_EMPTY
#define	SLIST_EMPTY(head)	((head)->slh_first == NULL)
#endif

#ifndef SLIST_FIRST
#define	SLIST_FIRST(head)	((head)->slh_first)
#endif

#ifndef SLIST_NEXT
#define	SLIST_NEXT(elm, field)	((elm)->field.sle_next)
#endif

#ifndef TAILQ_HEAD
#define TAILQ_HEAD(name, type)						\
struct name {								\
	struct type *tqh_first;	/* first element */			\
	struct type **tqh_last;	/* addr of last next element */		\
}
#endif

#ifndef TAILQ_HEAD_INITIALIZER
#define TAILQ_HEAD_INITIALIZER(head)					\
	{ NULL, &(head).tqh_first }
#endif

#ifndef TAILQ_ENTRY
#define TAILQ_ENTRY(type)						\
struct {								\
	struct type *tqe_next;	/* next element */			\
	struct type **tqe_prev;	/* address of previous next element */	\
}
#endif

#ifndef TAILQ_INIT
#define	TAILQ_INIT(head) do {						\
	(head)->tqh_first = NULL;					\
	(head)->tqh_last = &(head)->tqh_first;				\
} while (/*CONSTCOND*/0)
#endif

#ifndef TAILQ_INSERT_HEAD
#define 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 (/*CONSTCOND*/0)
#endif

#ifndef TAILQ_INSERT_TAIL
#define 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 (/*CONSTCOND*/0)
#endif

#ifndef TAILQ_INSERT_AFTER
#define	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 (/*CONSTCOND*/0)
#endif

#ifndef TAILQ_INSERT_BEFORE
#define	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 (/*CONSTCOND*/0)
#endif

#ifndef TAILQ_REMOVE
#define 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 (/*CONSTCOND*/0)
#endif

#ifndef TAILQ_FOREACH
#define TAILQ_FOREACH(var, head, field)					\
	for ((var) = ((head)->tqh_first);				\
		(var);							\
		(var) = ((var)->field.tqe_next))
#endif

#ifndef TAILQ_FOREACH_SAFE
#define	TAILQ_FOREACH_SAFE(var, head, field, next)			\
	for ((var) = ((head)->tqh_first);				\
	        (var) != NULL && ((next) = TAILQ_NEXT(var, field), 1);	\
		(var) = (next))
#endif

#undef TAILQ_FOREACH_REVERSE
#define	TAILQ_FOREACH_REVERSE(var, head, headname, field)		\
	for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last));	\
		(var);							\
		(var) = (*(((struct headname *)((var)->field.tqe_prev))->tqh_last)))

#ifndef TAILQ_EMPTY
#define	TAILQ_EMPTY(head)		((head)->tqh_first == NULL)
#endif
#ifndef TAILQ_FIRST
#define	TAILQ_FIRST(head)		((head)->tqh_first)
#endif
#ifndef TAILQ_NEXT
#define	TAILQ_NEXT(elm, field)		((elm)->field.tqe_next)
#endif

#ifndef TAILQ_LAST
#define	TAILQ_LAST(head, headname) \
	(*(((struct headname *)((head)->tqh_last))->tqh_last))
#endif

#ifndef CIRCLEQ_HEAD
#define	CIRCLEQ_HEAD(name, type)					\
struct name {								\
	struct type *cqh_first;		/* first element */		\
	struct type *cqh_last;		/* last element */		\
}
#endif

#ifndef CIRCLEQ_HEAD_INITIALIZER
#define	CIRCLEQ_HEAD_INITIALIZER(head)					\
	{ (void *)&head, (void *)&head }
#endif

#ifndef CIRCLEQ_ENTRY
#define	CIRCLEQ_ENTRY(type)						\
struct {								\
	struct type *cqe_next;		/* next element */		\
	struct type *cqe_prev;		/* previous element */		\
}
#endif

/*
 * Circular queue functions.
 */
#ifndef CIRCLEQ_INIT
#define	CIRCLEQ_INIT(head) do {						\
	(head)->cqh_first = (void *)(head);				\
	(head)->cqh_last = (void *)(head);				\
} while (/*CONSTCOND*/0)
#endif

#ifndef CIRCLEQ_INSERT_AFTER
#define	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 (/*CONSTCOND*/0)
#endif

#ifndef CIRCLEQ_INSERT_BEFORE
#define	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 (/*CONSTCOND*/0)
#endif

#ifndef CIRCLEQ_INSERT_HEAD
#define	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 (/*CONSTCOND*/0)
#endif

#ifndef CIRCLEQ_INSERT_TAIL
#define	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 (/*CONSTCOND*/0)
#endif

#ifndef CIRCLEQ_REMOVE
#define	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 (/*CONSTCOND*/0)
#endif

#ifndef CIRCLEQ_FOREACH
#define	CIRCLEQ_FOREACH(var, head, field)				\
	for ((var) = ((head)->cqh_first);				\
		(var) != (const void *)(head);				\
		(var) = ((var)->field.cqe_next))
#endif

#ifndef CIRCLEQ_FOREACH_REVERSE
#define	CIRCLEQ_FOREACH_REVERSE(var, head, field)			\
	for ((var) = ((head)->cqh_last);				\
		(var) != (const void *)(head);				\
		(var) = ((var)->field.cqe_prev))
#endif

#ifndef CIRCLEQ_EMPTY
#define	CIRCLEQ_EMPTY(head)		((head)->cqh_first == (void *)(head))
#endif
#ifndef CIRCLEQ_FIRST
#define	CIRCLEQ_FIRST(head)		((head)->cqh_first)
#endif
#ifndef CIRCLEQ_LAST
#define	CIRCLEQ_LAST(head)		((head)->cqh_last)
#endif
#ifndef CIRCLEQ_NEXT
#define	CIRCLEQ_NEXT(elm, field)	((elm)->field.cqe_next)
#endif
#ifndef CIRCLEQ_PREV
#define	CIRCLEQ_PREV(elm, field)	((elm)->field.cqe_prev)
#endif

#ifndef CIRCLEQ_LOOP_NEXT
#define CIRCLEQ_LOOP_NEXT(head, elm, field)				\
	(((elm)->field.cqe_next == (void *)(head))			\
	    ? ((head)->cqh_first)					\
	    : (elm->field.cqe_next))
#endif
#ifndef CIRCLEQ_LOOP_PREV
#define CIRCLEQ_LOOP_PREV(head, elm, field)				\
	(((elm)->field.cqe_prev == (void *)(head))			\
	    ? ((head)->cqh_last)					\
	    : (elm->field.cqe_prev))
#endif

#endif /* !_NBCOMPAT_QUEUE_H */