/**************************************************************************

 *

 * Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND. USA.

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sub license, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL

 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,

 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

 * USE OR OTHER DEALINGS IN THE SOFTWARE.

 *

 * The above copyright notice and this permission notice (including the

 * next paragraph) shall be included in all copies or substantial portions

 * of the Software.

 */

/*

 * List macros heavily inspired by the Linux kernel

 * list handling. No list looping yet.

 */

#include <stddef.h>

typedef struct _drmMMListHead

{

    struct _drmMMListHead *prev;

    struct _drmMMListHead *next;

} drmMMListHead;

#define DRMINITLISTHEAD(__item)		       \

  do{					       \

    (__item)->prev = (__item);		       \

    (__item)->next = (__item);		       \

  } while (0)

#define DRMLISTADD(__item, __list)		\

  do {						\

    (__item)->prev = (__list);			\

    (__item)->next = (__list)->next;		\

    (__list)->next->prev = (__item);		\

    (__list)->next = (__item);			\

  } while (0)

#define DRMLISTADDTAIL(__item, __list)		\

  do {						\

    (__item)->next = (__list);			\

    (__item)->prev = (__list)->prev;		\

    (__list)->prev->next = (__item);		\

    (__list)->prev = (__item);			\

  } while(0)

#define DRMLISTDEL(__item)			\

  do {						\

    (__item)->prev->next = (__item)->next;	\

    (__item)->next->prev = (__item)->prev;	\

  } while(0)

#define DRMLISTDELINIT(__item)			\

  do {						\

    (__item)->prev->next = (__item)->next;	\

    (__item)->next->prev = (__item)->prev;	\

    (__item)->next = (__item);			\

    (__item)->prev = (__item);			\

  } while(0)

#define DRMLISTENTRY(__type, __item, __field)   \

    ((__type *)(((char *) (__item)) - offsetof(__type, __field)))

#define DRMLISTEMPTY(__item) ((__item)->next == (__item))

#define DRMLISTSINGLE(__list) \

	(!DRMLISTEMPTY(__list) && ((__list)->next == (__list)->prev))

#define DRMLISTFOREACH(__item, __list)					\

	for ((__item) = (__list)->next;					\

	     (__item) != (__list); (__item) = (__item)->next)

#define DRMLISTFOREACHSAFE(__item, __temp, __list)			\

	for ((__item) = (__list)->next, (__temp) = (__item)->next;	\

	     (__item) != (__list);					\

	     (__item) = (__temp), (__temp) = (__item)->next)

#define DRMLISTFOREACHSAFEREVERSE(__item, __temp, __list)		\

	for ((__item) = (__list)->prev, (__temp) = (__item)->prev;	\

	     (__item) != (__list);					\

	     (__item) = (__temp), (__temp) = (__item)->prev)

#define DRMLISTFOREACHENTRY(__item, __list, __head)                            \

	for ((__item) = DRMLISTENTRY(typeof(*__item), (__list)->next, __head); \

	     &(__item)->__head != (__list);                                    \

	     (__item) = DRMLISTENTRY(typeof(*__item),                          \

				     (__item)->__head.next, __head))

#define DRMLISTFOREACHENTRYSAFE(__item, __temp, __list, __head)                \

	for ((__item) = DRMLISTENTRY(typeof(*__item), (__list)->next, __head), \

	     (__temp) = DRMLISTENTRY(typeof(*__item),                          \

				     (__item)->__head.next, __head);           \

	     &(__item)->__head != (__list);                                    \

	     (__item) = (__temp),                                              \

	     (__temp) = DRMLISTENTRY(typeof(*__item),                          \

				     (__temp)->__head.next, __head))

#define DRMLISTJOIN(__list, __join) if (!DRMLISTEMPTY(__list)) {	\

	(__list)->next->prev = (__join);				\

	(__list)->prev->next = (__join)->next;				\

	(__join)->next->prev = (__list)->prev;				\

	(__join)->next = (__list)->next;				\

}