双链表的删除

typedef struct dnode
{
        int data;
        struct dnode *prior;
        struct dnode *next;
}DNode;

void node_delete(DNode *head, int position)
{
        DNode *p = head;
        DNode *q = NULL;
        int i = 0;
        while(p && i++ < position)
                p = p->next;
        p->prior->next = p->next;
        p->next->prior = p->prior;
        free(p);
}