c++语言的链表问题 菜鸟提问

struct record
{

book object;
record *prior;
record *next;
};
下面是截取的另一部分
record *H = new record;
record *p = H;

record *q = H;

while (inData >>p->object.name >>p->object.number >>p->object.qq>>p->object.post >>p->object.address)
{

p->next = new record;

p = p->next;

p->prior = q;

q->next = p;

q = p;

}

p->next = NULL;

//inDate是一个文件流
//object.name代表一个值 其他的也是
不理解
p->next = new record;

p = p->next;

p->prior = q;

q->next = p;

q = p;

的意思 晕死了
求大神逐步解释 只知道功能是向各个节点中输入值
在网上查了相关知识 但是越看越晕