u_double_list.h

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/**************************************************************************
 * 
 * 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.
 * 
 **************************************************************************/

#ifndef _U_DOUBLE_LIST_H_
#define _U_DOUBLE_LIST_H_


#include <stddef.h>


struct list_head
{
    struct list_head *prev;
    struct list_head *next;
};


#define LIST_INITHEAD(__item)                   \
  do {                                          \
    (__item)->prev = (__item);                  \
    (__item)->next = (__item);                  \
  } while (0)

#define LIST_ADD(__item, __list)                \
  do {                                          \
    (__item)->prev = (__list);                  \
    (__item)->next = (__list)->next;            \
    (__list)->next->prev = (__item);            \
    (__list)->next = (__item);                  \
  } while (0)

#define LIST_ADDTAIL(__item, __list)            \
  do {                                          \
    (__item)->next = (__list);                  \
    (__item)->prev = (__list)->prev;            \
    (__list)->prev->next = (__item);            \
    (__list)->prev = (__item);                  \
  } while(0)

#define LIST_REPLACE(__from, __to)              \
  do {                                          \
    (__to)->prev = (__from)->prev;              \
    (__to)->next = (__from)->next;              \
    (__from)->next->prev = (__to);              \
    (__from)->prev->next = (__to);              \
  } while (0)

#define LIST_DEL(__item)                        \
  do {                                          \
    (__item)->prev->next = (__item)->next;      \
    (__item)->next->prev = (__item)->prev;      \
  } while(0)

#define LIST_DELINIT(__item)                    \
  do {                                          \
    (__item)->prev->next = (__item)->next;      \
    (__item)->next->prev = (__item)->prev;      \
    (__item)->next = (__item);                  \
    (__item)->prev = (__item);                  \
  } while(0)

#define LIST_ENTRY(__type, __item, __field)   \
    ((__type *)(((char *)(__item)) - offsetof(__type, __field)))


#endif /*_U_DOUBLE_LIST_H_*/

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