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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.  /** @addtogroup genericadt
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef __LIST_H__
  36. #define __LIST_H__
  37.  
  38. #include <arch/types.h>
  39. #include <typedefs.h>
  40.  
  41. /** Doubly linked list head and link type. */
  42. struct link {
  43.     link_t *prev;   /**< Pointer to the previous item in the list. */
  44.     link_t *next;   /**< Pointer to the next item in the list. */
  45. };
  46.  
  47. /** Declare and initialize statically allocated list.
  48.  *
  49.  * @param name Name of the new statically allocated list.
  50.  */
  51. #define LIST_INITIALIZE(name)       link_t name = { .prev = &name, .next = &name }
  52.  
  53. /** Initialize doubly-linked circular list link
  54.  *
  55.  * Initialize doubly-linked list link.
  56.  *
  57.  * @param link Pointer to link_t structure to be initialized.
  58.  */
  59. static inline void link_initialize(link_t *link)
  60. {
  61.     link->prev = NULL;
  62.     link->next = NULL;
  63. }
  64.  
  65. /** Initialize doubly-linked circular list
  66.  *
  67.  * Initialize doubly-linked circular list.
  68.  *
  69.  * @param head Pointer to link_t structure representing head of the list.
  70.  */
  71. static inline void list_initialize(link_t *head)
  72. {
  73.     head->prev = head;
  74.     head->next = head;
  75. }
  76.  
  77. /** Add item to the beginning of doubly-linked circular list
  78.  *
  79.  * Add item to the beginning of doubly-linked circular list.
  80.  *
  81.  * @param link Pointer to link_t structure to be added.
  82.  * @param head Pointer to link_t structure representing head of the list.
  83.  */
  84. static inline void list_prepend(link_t *link, link_t *head)
  85. {
  86.     link->next = head->next;
  87.     link->prev = head;
  88.     head->next->prev = link;
  89.     head->next = link;
  90. }
  91.  
  92. /** Add item to the end of doubly-linked circular list
  93.  *
  94.  * Add item to the end of doubly-linked circular list.
  95.  *
  96.  * @param link Pointer to link_t structure to be added.
  97.  * @param head Pointer to link_t structure representing head of the list.
  98.  */
  99. static inline void list_append(link_t *link, link_t *head)
  100. {
  101.     link->prev = head->prev;
  102.     link->next = head;
  103.     head->prev->next = link;
  104.     head->prev = link;
  105. }
  106.  
  107. /** Remove item from doubly-linked circular list
  108.  *
  109.  * Remove item from doubly-linked circular list.
  110.  *
  111.  * @param link Pointer to link_t structure to be removed from the list it is contained in.
  112.  */
  113. static inline void list_remove(link_t *link)
  114. {
  115.     link->next->prev = link->prev;
  116.     link->prev->next = link->next;
  117.     link_initialize(link);
  118. }
  119.  
  120. /** Query emptiness of doubly-linked circular list
  121.  *
  122.  * Query emptiness of doubly-linked circular list.
  123.  *
  124.  * @param head Pointer to link_t structure representing head of the list.
  125.  */
  126. static inline bool list_empty(link_t *head)
  127. {
  128.     return head->next == head ? true : false;
  129. }
  130.  
  131.  
  132. /** Split or concatenate headless doubly-linked circular list
  133.  *
  134.  * Split or concatenate headless doubly-linked circular list.
  135.  *
  136.  * Note that the algorithm works both directions:
  137.  * concatenates splitted lists and splits concatenated lists.
  138.  *
  139.  * @param part1 Pointer to link_t structure leading the first (half of the headless) list.
  140.  * @param part2 Pointer to link_t structure leading the second (half of the headless) list.
  141.  */
  142. static inline void headless_list_split_or_concat(link_t *part1, link_t *part2)
  143. {
  144.     link_t *hlp;
  145.  
  146.     part1->prev->next = part2;
  147.     part2->prev->next = part1; 
  148.     hlp = part1->prev;
  149.     part1->prev = part2->prev;
  150.     part2->prev = hlp;
  151. }
  152.  
  153.  
  154. /** Split headless doubly-linked circular list
  155.  *
  156.  * Split headless doubly-linked circular list.
  157.  *
  158.  * @param part1 Pointer to link_t structure leading the first half of the headless list.
  159.  * @param part2 Pointer to link_t structure leading the second half of the headless list.
  160.  */
  161. static inline void headless_list_split(link_t *part1, link_t *part2)
  162. {
  163.     headless_list_split_or_concat(part1, part2);
  164. }
  165.  
  166. /** Concatenate two headless doubly-linked circular lists
  167.  *
  168.  * Concatenate two headless doubly-linked circular lists.
  169.  *
  170.  * @param part1 Pointer to link_t structure leading the first headless list.
  171.  * @param part2 Pointer to link_t structure leading the second headless list.
  172.  */
  173. static inline void headless_list_concat(link_t *part1, link_t *part2)
  174. {
  175.     headless_list_split_or_concat(part1, part2);
  176. }
  177.  
  178. #define list_get_instance(link,type,member) (type *)(((__u8*)(link))-((__u8*)&(((type *)NULL)->member)))
  179.  
  180. extern bool list_member(const link_t *link, const link_t *head);
  181. extern void list_concat(link_t *head1, link_t *head2);
  182.  
  183. #endif
  184.  
  185.  /** @}
  186.  */
  187.  
  188.