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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #ifndef __LIST_H__
  30. #define __LIST_H__
  31.  
  32. #include <arch/types.h>
  33. #include <typedefs.h>
  34.  
  35. struct link {
  36.     link_t *prev;
  37.     link_t *next;
  38. };
  39.  
  40.  
  41. #define link_initialize(link) { \
  42.     (link)->prev = NULL; \
  43.     (link)->next = NULL; \
  44. }
  45.  
  46. #define list_initialize(head) { \
  47.     (head)->prev = (head); \
  48.     (head)->next = (head); \
  49. }
  50.  
  51. #define list_prepend(link, head) { \
  52.     (link)->next = (head)->next; \
  53.     (link)->prev = (head); \
  54.     (head)->next->prev = (link); \
  55.     (head)->next = (link); \
  56. }
  57.  
  58. #define list_append(link, head) { \
  59.     (link)->prev = (head)->prev; \
  60.     (link)->next = (head); \
  61.     (head)->prev->next = (link); \
  62.     (head)->prev = (link); \
  63. }
  64.  
  65. #define list_remove(link) { \
  66.     (link)->next->prev = (link)->prev; \
  67.     (link)->prev->next = (link)->next; \
  68.     link_initialize(link); \
  69. }
  70.  
  71. #define list_empty(head) (((head)->next == (head))?1:0)
  72.  
  73. #define list_get_instance(link,type,member) (type *)(((__u8*)(link))-((__u8*)&(((type *)NULL)->member)))
  74.  
  75. extern int list_member(link_t *link, link_t *head);
  76. extern void list_concat(link_t *head1, link_t *head2);
  77.  
  78. #endif
  79.