头文件定义和包含：

#define _CRT_SECURE_NO_WARNINGS 1
#pragma once

#include#include#include 
#includetypedef int LTDataType;
typedef struct DListNode
{
	struct DListNode* next;
	struct DListNode* prev;
	LTDataType data;

}LTNode;

LTNode* BuyListNode(LTDataType x);

LTNode* ListInit();

void ListPushBack(LTNode* phead,LTDataType x);

void ListPopBack(LTNode* phead);

void ListPushFront(LTNode* phead, LTDataType x);

void ListPopFront(LTNode* phead);

void LTPrint(LTNode* phead);

LTNode* LTFind(LTNode* phead,LTDataType x);

//在pos之前位置插入x
void ListInsert(LTNode* pos,LTDataType x);
//删除pos位置
void ListErase(LTNode* pos);

bool LTEmpty(LTNode* phead);

size_t LTSize(LTNode* phead);

void LTDestroy(LTNode* phead);

函数的实现：

对于insert函数来说，完全可以替代头插尾插，设置好参数就可以了

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#define _CRT_SECURE_NO_WARNINGS 1
#include "DList.h"

LTNode* BuyListNode(LTDataType x)
{
	LTNode* node = (LTNode*)malloc(sizeof(LTNode));
	if (node == NULL)
	{
		perror("malloc fail");
		exit(-1);
	}

	node->data = x;
	node->next = NULL;
	node->prev = NULL;
	return node;
}

LTNode* ListInit()
{
	LTNode* phead = BuyListNode(-1);
	phead->next = phead;
	phead->prev = phead;

	return phead;
}

void ListPushBack(LTNode* phead, LTDataType x)
{
	assert(phead);
	LTNode* newnode = BuyListNode(x);
	LTNode* tail = phead->prev;

	tail->next = newnode;
	newnode->prev = tail;
	newnode->next = phead;
	phead->prev = newnode;
	//ListInsert(phead, x);

}

void ListPopBack(LTNode* phead)
{
	assert(phead);
	assert(phead->next != phead);

	LTNode* tail = phead->prev;
	LTNode* tailPrev = tail->prev;

	tailPrev->next = phead;
	phead->prev = tailPrev;
	free(tail);
	//ListErase(phead->prev);
}

void ListPushFront(LTNode* phead,LTDataType x)
{
	assert(phead);
	LTNode* newnode = BuyListNode(x);
	LTNode* next = phead->next;

	phead->next->prev = newnode;
	phead->next = newnode;
	newnode->prev = phead;
	//ListInsert(phead->next, x);
}

void ListPopFront(LTNode* phead)
{
	assert(phead);
	assert(phead->next != phead);

	LTNode* first = phead->next;
	LTNode* second = first->next;

	free(first);
	phead->next = second;
	second->prev = phead;
	//ListErase(phead->next);
}

void LTPrint(LTNode* phead)
{
	assert(phead);

	LTNode* cur = phead->next;
	while (cur != phead)
	{
		printf("%d ", cur->data);
		cur = cur->next;
	}
	printf("\n");
}

LTNode* LTFind(LTNode* phead, LTDataType x)
{
	assert(phead);
	LTNode* cur = phead->next;
	while (cur != phead)
	{
		if (cur->data == x)
		{
			printf("找到了");
			return cur;
		}
		cur = cur->next;
	}
	return NULL;
}


//在pos之前位置插入x
void ListInsert(LTNode* pos, LTDataType x)
{
	assert(pos);

	LTNode* prev = pos->prev;
	LTNode* newnode = BuyListNode(x);
	prev->next = newnode;
	newnode->prev = prev;
	pos->prev = newnode;
}

//删除pos位置
void ListErase(LTNode* pos)
{
	LTNode* prev = pos->prev;
	LTNode* next = pos->next;
	free(pos);
	prev->next = next;
	next->prev = prev;
}


bool LTEmpty(LTNode* phead)
{
	assert(phead);
	return phead->next == phead;
}

size_t LTSize(LTNode* phead)
{
	assert(phead);
	size_t size = 0;
	LTNode* cur = phead->next;
	while (cur != phead)
	{
		++size;
		cur = cur->next;
	}
	
	return size;
}

void LTDestroy(LTNode* phead)
{
	assert(phead);
	LTNode* cur = phead->next;
	while (cur != phead)
	{
		LTNode* next = cur->next;
		free(cur);
		cur = next;

	}
	free(phead);
}

测试用例：

#include "DList.h"

void test1()
{
	LTNode* phead = ListInit();
	ListPushBack(phead, 1);
	LTPrint(phead);

	ListPushBack(phead, 2);
	LTPrint(phead);

	ListPushBack(phead, 3);
	LTPrint(phead);

	ListPushBack(phead, 4);
	LTPrint(phead);

	ListPopBack(phead);
	ListPopBack(phead);
	ListPopBack(phead);
	LTPrint(phead);

	ListPopFront(phead);
	//ListPopFront(phead);
	LTPrint(phead);
	LTNode* pos = LTFind(phead, 4);
	if (pos != NULL)
	{
		printf("%d ", pos->data);
	}
}




int main()
{
	test1();
	return 0;
}

这里只简单的测试了一点，需要的可以自行编辑运行

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