1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #include "list.h" 17 18 #include <stddef.h> 19 ListInit(struct ListNode * node)20void ListInit(struct ListNode *node) 21 { 22 if (node == NULL) { 23 return; 24 } 25 node->next = node; 26 node->prev = node; 27 } 28 ListAddTail(struct ListNode * head,struct ListNode * item)29void ListAddTail(struct ListNode *head, struct ListNode *item) 30 { 31 if (head == NULL || item == NULL) { 32 return; 33 } 34 item->next = head; 35 item->prev = head->prev; 36 head->prev->next = item; 37 head->prev = item; 38 } 39 ListRemove(struct ListNode * item)40void ListRemove(struct ListNode *item) 41 { 42 if (item == NULL) { 43 return; 44 } 45 item->next->prev = item->prev; 46 item->prev->next = item->next; 47 } 48