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 208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline void dl_list_init(struct dl_list *list) 218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt list->next = list; 238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt list->prev = list; 248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline void dl_list_add(struct dl_list *list, struct dl_list *item) 278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->next = list->next; 298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->prev = list; 308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt list->next->prev = item; 318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt list->next = item; 328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline void dl_list_add_tail(struct dl_list *list, struct dl_list *item) 358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt dl_list_add(list->prev, item); 378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline void dl_list_del(struct dl_list *item) 408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->next->prev = item->prev; 428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->prev->next = item->next; 438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->next = NULL; 448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->prev = NULL; 458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline int dl_list_empty(struct dl_list *list) 488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return list->next == list; 508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline unsigned int dl_list_len(struct dl_list *list) 538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct dl_list *item; 558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int count = 0; 568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (item = list->next; item != list; item = item->next) 578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt count++; 588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return count; 598d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#ifndef offsetof 628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define offsetof(type, member) ((long) &((type *) 0)->member) 638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#endif 648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_entry(item, type, member) \ 668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ((type *) ((char *) item - offsetof(type, member))) 678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_first(list, type, member) \ 698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt (dl_list_empty((list)) ? NULL : \ 708d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt dl_list_entry((list)->next, type, member)) 718d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 728d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_last(list, type, member) \ 738d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt (dl_list_empty((list)) ? NULL : \ 748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt dl_list_entry((list)->prev, type, member)) 758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_for_each(item, list, type, member) \ 778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (item = dl_list_entry((list)->next, type, member); \ 788d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt &item->member != (list); \ 798d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item = dl_list_entry(item->member.next, type, member)) 808d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_for_each_safe(item, n, list, type, member) \ 828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (item = dl_list_entry((list)->next, type, member), \ 838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt n = dl_list_entry(item->member.next, type, member); \ 848d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt &item->member != (list); \ 858d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item = n, n = dl_list_entry(n->member.next, type, member)) 868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_for_each_reverse(item, list, type, member) \ 888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (item = dl_list_entry((list)->prev, type, member); \ 898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt &item->member != (list); \ 908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item = dl_list_entry(item->member.prev, type, member)) 918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 921f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt#define DEFINE_DL_LIST(name) \ 931f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt struct dl_list name = { &(name), &(name) } 941f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 958d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#endif /* LIST_H */ 96