你没有提供足够的信息来了解更多细节，所以我猜这是一个单独喜欢的列表.如果是这样，您需要遍历您的列表一次.

You don't provide enough informations to have more details, so I guessed it is a singly liked list. If so, you need to run through your list once.

void reverse(struct node **p) {
    struct node *buff = NULL;
    struct node *head = *p;

    while (head != NULL) {
        struct node *temp = head->next;
        head->next = buff;
        buff = head;
        head = temp;
    }   

    *p = buff;
}