【数据结构】删除一个无头单链表的非尾接点

void DelNotTailNode(PSListNode pos)
{
    
    
    PSListNode pNode = NULL;
    assert(pos);
    if (NULL == pos->pNextNode)
    {
    
    
        return;
    }

    else
    {
    
    
        DataType temp = 0;
        //交换pos和pos->pNextNode的数据（相当于交换了两个结点的位置），使问题转换为删除pos指向的结点的下一个结点
        temp = pos->data;
        pos->data = pos->pNextNode->data;
        pos->pNextNode->data = temp;
        pNode = pos->pNextNode;
        pos->pNextNode = pos->pNextNode->pNextNode;
        free(pNode);
        pNode = NULL;
    }
}