list.h revision 1f69aa52ea2e0a73ac502565df8c666ee49cab6a
18d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt/* 28d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Doubly-linked list 38d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Copyright (c) 2009, Jouni Malinen <j@w1.fi> 48d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 58d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * This program is free software; you can redistribute it and/or modify 68d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * it under the terms of the GNU General Public License version 2 as 78d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * published by the Free Software Foundation. 88d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 98d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Alternatively, this software may be distributed under the terms of BSD 108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * license. 118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * See README and COPYING for more details. 138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#ifndef LIST_H 168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define LIST_H 178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt/** 198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * struct dl_list - Doubly-linked list 208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct dl_list { 228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct dl_list *next; 238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct dl_list *prev; 248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt}; 258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline void dl_list_init(struct dl_list *list) 278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt list->next = list; 298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt list->prev = list; 308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline void dl_list_add(struct dl_list *list, struct dl_list *item) 338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->next = list->next; 358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->prev = list; 368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt list->next->prev = item; 378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt list->next = item; 388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline void dl_list_add_tail(struct dl_list *list, struct dl_list *item) 418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt dl_list_add(list->prev, item); 438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline void dl_list_del(struct dl_list *item) 468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->next->prev = item->prev; 488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->prev->next = item->next; 498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->next = NULL; 508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item->prev = NULL; 518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline int dl_list_empty(struct dl_list *list) 548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return list->next == list; 568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic inline unsigned int dl_list_len(struct dl_list *list) 598d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct dl_list *item; 618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int count = 0; 628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (item = list->next; item != list; item = item->next) 638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt count++; 648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return count; 658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#ifndef offsetof 688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define offsetof(type, member) ((long) &((type *) 0)->member) 698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#endif 708d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 718d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_entry(item, type, member) \ 728d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ((type *) ((char *) item - offsetof(type, member))) 738d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_first(list, type, member) \ 758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt (dl_list_empty((list)) ? NULL : \ 768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt dl_list_entry((list)->next, type, member)) 778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 788d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_last(list, type, member) \ 798d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt (dl_list_empty((list)) ? NULL : \ 808d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt dl_list_entry((list)->prev, type, member)) 818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_for_each(item, list, type, member) \ 838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (item = dl_list_entry((list)->next, type, member); \ 848d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt &item->member != (list); \ 858d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item = dl_list_entry(item->member.next, type, member)) 868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_for_each_safe(item, n, list, type, member) \ 888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (item = dl_list_entry((list)->next, type, member), \ 898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt n = dl_list_entry(item->member.next, type, member); \ 908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt &item->member != (list); \ 918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item = n, n = dl_list_entry(n->member.next, type, member)) 928d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#define dl_list_for_each_reverse(item, list, type, member) \ 948d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt for (item = dl_list_entry((list)->prev, type, member); \ 958d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt &item->member != (list); \ 968d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt item = dl_list_entry(item->member.prev, type, member)) 978d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 981f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt#define DEFINE_DL_LIST(name) \ 991f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt struct dl_list name = { &(name), &(name) } 1001f69aa52ea2e0a73ac502565df8c666ee49cab6aDmitry Shmidt 1018d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#endif /* LIST_H */ 102