18d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt/* 28d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Doubly-linked list 38d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Copyright (c) 2009, Jouni Malinen <j@w1.fi> 48d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 5c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidt * This software may be distributed under the terms of the BSD license. 6c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidt * See README for more details. 78d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 88d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 98d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#ifndef LIST_H 108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define LIST_H 118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt/** 138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * struct dl_list - Doubly-linked list 148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct dl_list { 168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct dl_list *next; 178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct dl_list *prev; 188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt}; 198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 207f65602d49069f96a7bb44da8bd79ffe8d4c6a98Dmitry Shmidt#define DL_LIST_HEAD_INIT(l) { &(l), &(l) } 217f65602d49069f96a7bb44da8bd79ffe8d4c6a98Dmitry Shmidt 228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline void dl_list_init(struct dl_list *list) 238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt list->next = list; 258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt list->prev = list; 268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline void dl_list_add(struct dl_list *list, struct dl_list *item) 298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->next = list->next; 318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->prev = list; 328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt list->next->prev = item; 338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt list->next = item; 348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline void dl_list_add_tail(struct dl_list *list, struct dl_list *item) 378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt dl_list_add(list->prev, item); 398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline void dl_list_del(struct dl_list *item) 428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->next->prev = item->prev; 448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->prev->next = item->next; 458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->next = NULL; 468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->prev = NULL; 478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline int dl_list_empty(struct dl_list *list) 508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return list->next == list; 528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline unsigned int dl_list_len(struct dl_list *list) 558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct dl_list *item; 578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int count = 0; 588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (item = list->next; item != list; item = item->next) 598d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt count++; 608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return count; 618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#ifndef offsetof 648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define offsetof(type, member) ((long) &((type *) 0)->member) 658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#endif 668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_entry(item, type, member) \ 688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ((type *) ((char *) item - offsetof(type, member))) 698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 708d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_first(list, type, member) \ 718d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt (dl_list_empty((list)) ? NULL : \ 728d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt dl_list_entry((list)->next, type, member)) 738d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_last(list, type, member) \ 758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt (dl_list_empty((list)) ? NULL : \ 768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt dl_list_entry((list)->prev, type, member)) 778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 788d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_for_each(item, list, type, member) \ 798d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (item = dl_list_entry((list)->next, type, member); \ 808d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt &item->member != (list); \ 818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item = dl_list_entry(item->member.next, type, member)) 828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_for_each_safe(item, n, list, type, member) \ 848d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (item = dl_list_entry((list)->next, type, member), \ 858d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt n = dl_list_entry(item->member.next, type, member); \ 868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt &item->member != (list); \ 878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item = n, n = dl_list_entry(n->member.next, type, member)) 888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_for_each_reverse(item, list, type, member) \ 908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (item = dl_list_entry((list)->prev, type, member); \ 918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt &item->member != (list); \ 928d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item = dl_list_entry(item->member.prev, type, member)) 938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 941f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt#define DEFINE_DL_LIST(name) \ 951f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt struct dl_list name = { &(name), &(name) } 961f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 978d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#endif /* LIST_H */ 98