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162 | #include "List.h"
ListNode* BuyListNode(LTDataType x)
{
ListNode* newnode = (ListNode*)malloc(sizeof(ListNode));
newnode->data = x;
newnode->next = NULL;
newnode->prev = NULL;
return newnode;
}
ListNode* ListInit()
{
ListNode* phead = BuyListNode(NULL);
phead->next = phead;
phead->prev = phead;
return phead;
}
void ListDestory(ListNode* phead)
{
assert(phead);
ListNode* cur = phead->next;
while (cur != phead)
{
ListNode* next = cur->next;
free(cur);
cur = next;
}
free(phead);
phead = NULL;
}
void ListPrint(ListNode* phead)
{
assert(phead);
ListNode* cur = phead->next;
while (cur != phead)
{
printf("%d ", cur->data);
cur = cur->next;
}
printf("\n");
}
void ListPushBack(ListNode* phead, LTDataType x)
{
assert(phead);
//ListNode* tail = phead->prev;
//ListNode* newnode = BuyListNode(x);
//tail->next = newnode;
//newnode->prev = tail;
//newnode->next = phead;
//phead->prev = newnode;
ListInsert(phead, x);
}
void ListPushFront(ListNode* phead, LTDataType x)
{
assert(phead);
//ListNode* newnode = BuyListNode(x);
//newnode->next = phead->next;
//phead->next->prev = newnode;
//phead->next = newnode;
//newnode->prev = phead;
ListInsert(phead->next, x);
}
void ListPopFront(ListNode* phead)
{
assert(phead);
//assert(phead->next != phead);
//ListNode* first = phead->next;
//ListNode* second = first->next;
//phead->next = second;
//second->prev = phead;
//free(first);
//first = NULL;
ListErase(phead->next);
}
void ListPopBack(ListNode* phead)
{
assert(phead);
/*assert(phead->next != phead);
ListNode* tail = phead->prev;
ListNode* prev = tail->prev;
prev->next = phead;
phead->prev = prev;
free(tail);
tail = NULL;*/
ListErase(phead->prev);
}
ListNode* ListFind(ListNode* phead, LTDataType x)
{
assert(phead);
ListNode* cur = phead->next;
while (cur != phead)
{
if (cur->data == x)
{
return cur;
}
cur = cur->next;
}
return NULL;
}
// pos位置之前插入x
void ListInsert(ListNode* pos, LTDataType x)
{
assert(pos);
ListNode* prev = pos->prev;
ListNode* newnode = BuyListNode(x);
prev->next = newnode;
newnode->prev = prev;
newnode->next = pos;
pos->prev = newnode;
}
// 删除pos位置的值
void ListErase(ListNode* pos)
{
assert(pos);
ListNode* prev = pos->prev;
ListNode* next = pos->next;
prev->next = next;
next->prev = prev;
free(pos);
}
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