Add generic doubly-linked list implementation
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d2e6100c16
commit
dacf478352
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/*
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* Doubly-linked list
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* Copyright (c) 2009, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#ifndef LIST_H
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#define LIST_H
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/**
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* struct dl_list - Doubly-linked list
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*/
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struct dl_list {
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struct dl_list *next;
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struct dl_list *prev;
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};
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static inline void dl_list_init(struct dl_list *list)
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{
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list->next = list;
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list->prev = list;
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}
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static inline void dl_list_add(struct dl_list *list, struct dl_list *item)
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{
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item->next = list->next;
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item->prev = list;
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list->next->prev = item;
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list->next = item;
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}
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static inline void dl_list_add_tail(struct dl_list *list, struct dl_list *item)
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{
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dl_list_add(list->prev, item);
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}
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static inline void dl_list_del(struct dl_list *item)
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{
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item->next->prev = item->prev;
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item->prev->next = item->next;
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item->next = NULL;
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item->prev = NULL;
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}
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static inline int dl_list_empty(struct dl_list *list)
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{
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return list->next == list;
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}
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static inline unsigned int dl_list_len(struct dl_list *list)
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{
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struct dl_list *item;
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int count = 0;
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for (item = list->next; item != list; item = item->next)
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count++;
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return count;
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}
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#ifndef offsetof
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#define offsetof(type, member) ((long) &((type *) 0)->member)
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#endif
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#define dl_list_entry(item, type, member) \
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((type *) ((char *) item - offsetof(type, member)))
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#define dl_list_first(list, type, member) \
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(dl_list_empty((list)) ? NULL : \
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dl_list_entry((list)->next, type, member))
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#define dl_list_for_each(item, list, type, member) \
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for (item = dl_list_entry((list)->next, type, member); \
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&item->member != (list); \
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item = dl_list_entry(item->member.next, type, member))
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#define dl_list_for_each_safe(item, n, list, type, member) \
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for (item = dl_list_entry((list)->next, type, member), \
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n = dl_list_entry(item->member.next, type, member); \
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&item->member != (list); \
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item = n, n = dl_list_entry(n->member.next, type, member))
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#endif /* LIST_H */
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@ -0,0 +1,78 @@
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/*
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* Doubly-linked list - test program
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* Copyright (c) 2009, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "utils/includes.h"
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#include "utils/os.h"
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#include "utils/list.h"
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struct test {
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struct dl_list list;
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int value;
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};
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static void dump_list(struct dl_list *head)
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{
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struct test *t;
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printf("dump:");
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dl_list_for_each(t, head, struct test, list)
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printf(" %d", t->value);
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printf(" (len=%d%s)\n", dl_list_len(head),
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dl_list_empty(head) ? " empty" : "");
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}
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int main(int argc, char *argv[])
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{
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struct dl_list head;
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struct test *t, *tmp;
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int i;
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dl_list_init(&head);
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dump_list(&head);
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for (i = 0; i < 5; i++) {
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t = os_zalloc(sizeof(*t));
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if (t == NULL)
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return -1;
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t->value = i;
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dl_list_add(&head, &t->list);
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dump_list(&head);
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}
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for (i = 10; i > 5; i--) {
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t = os_zalloc(sizeof(*t));
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if (t == NULL)
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return -1;
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t->value = i;
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dl_list_add_tail(&head, &t->list);
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dump_list(&head);
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}
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i = 0;
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dl_list_for_each(t, &head, struct test, list)
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if (++i == 5)
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break;
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printf("move: %d\n", t->value);
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dl_list_del(&t->list);
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dl_list_add(&head, &t->list);
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dump_list(&head);
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dl_list_for_each_safe(t, tmp, &head, struct test, list) {
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printf("delete: %d\n", t->value);
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dl_list_del(&t->list);
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os_free(t);
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dump_list(&head);
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}
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return 0;
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}
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