linux简单内核链表排序

#include <stdio.h>
#include <stdlib.h>

#define container_of(ptr, type, mem)(type *)((unsigned long)ptr -(unsigned long)&((type *)NULL)->mem) 

struct person {
    struct person *next;
    struct person *pre;
};

struct boy {
    struct person p;
    int age;
};

struct person *creat(struct person *head, int age);
struct person *choose_sort(struct person *head);
struct person *insert_sort(struct person *head);
void show(struct person *head);

int main()
{
    struct person *head = NULL;
    head = creat(head, 30);
    head = creat(head, 20);
    head = creat(head, 25);
    head = creat(head, 80);
    head = creat(head, 60);
    head = creat(head, 40);
    head = insert_sort(head);
    show(head);    

}
struct person *creat(struct person *head, int age)
{
    struct boy *tmp = NULL;
    struct person *find = NULL;

    tmp = (struct boy *)malloc(sizeof(struct boy));
    tmp->age = age;
    tmp->p.next = NULL;
    tmp->p.pre = NULL;

    if(NULL == head) {
        head = &tmp->p;
        head->next = head;
        head->pre = head;
        return head;
    }

    find = head;
    while(find->next != head) {
        find = find->next;
    }

    find->next = &tmp->p;
    tmp->p.pre = find;
    tmp->p.next = head;
    head->pre = &tmp->p;

    return head;
}
#if 0
struct person *choose_sort(struct person *head)
{
    struct person *tmp = NULL;
    struct boy *min = NULL;
    struct person *newhead = NULL;
    struct person *tail = NULL;
    struct boy *find = NULL;

    while(head) {
        tmp = head;
        min = container_of(head, struct boy, p);

        do {
            find = container_of(tmp, struct boy, p);
            if(find->age < min->age) {
                min = find;
            }
            tmp = tmp->next;

        } while(tmp != head);

        struct person *min_p = &min->p;
        if(min_p == head && head->next != head) {
            head = head->next;
            head->pre = min_p->pre;
            min_p->pre->next = head;
            min_p->pre = NULL;
            min_p->pre = NULL;
        }
        else {
            if(min_p == head && head->next == head) {
                head->next = NULL;
                head->pre = NULL;
                head = head->next;
            }

            else {
                min_p->pre->next = min_p->next;
                min_p->next->pre = min_p->pre;
                min_p->next = NULL;
                min_p->pre = NULL;
            }
        }
        if(NULL == newhead) {
            newhead = min_p;
            newhead->next = newhead;
            newhead->pre = newhead;
            tail = newhead;
            continue;
        }
        tail->next = min_p;
        min_p->pre = tail;
        min_p->next = newhead;
        newhead->pre = min_p;
        tail = min_p;
    }
    return newhead;
}

#else
struct person *choose_sort(struct person *head)
{
    struct person *tmp = NULL;
    struct boy *min = NULL;
    struct person *newhead = NULL;
    struct person *tail = NULL;
    struct boy *find = NULL;

    while(head) {
        tmp = head;
        min = container_of(head, struct boy, p);

        do {
            find = container_of(tmp, struct boy, p);
            if(find->age < min->age) {
                min = find;
            }
            tmp = tmp->next;

        } while(tmp != head);

        if(&min->p == head && head->next != head) {
            head = head->next;
            head->pre = min->p.pre;
            min->p.pre->next = head;
            min->p.pre = NULL;
            min->p.next = NULL;
        }
        else {
            if(&min->p == head && head->next == head) {
                head->next = NULL;
                head->pre = NULL;
                head = head->next;
            }

            else {
                min->p.pre->next = min->p.next;
                min->p.next->pre = min->p.pre;
                min->p.next = NULL;
                min->p.pre = NULL;
            }
        }
        if(NULL == newhead) {
            newhead = &min->p;
            newhead->next = newhead;
            newhead->pre = newhead;
            tail = newhead;
            continue;
        }
        tail->next = &min->p;
        min->p.pre = tail;
        min->p.next = newhead;
        newhead->pre = &min->p;
        tail = &min->p;
    }
    return newhead;
}
#endif

struct person *insert_sort(struct person *head)
{
    struct boy *tmp = NULL;
    struct boy *new = NULL;
    struct person *find = NULL;
    struct person *list = NULL;
    struct person *newhead = NULL;
    struct person *tail = NULL;
    struct boy *key = NULL;

    while(head) {
        find = head;
        tmp = container_of(find, struct boy, p);
        if(head->next == head) {
            head->next = NULL;
            head = head->next;
            find->pre = NULL;
        }
        else {
            head = head->next;
            head->pre = find->pre;
            find->pre->next = head;
            find->pre = NULL;
            find->next = NULL;
        }

        if(NULL == newhead) {
            newhead = find;
            newhead->pre = newhead;
            newhead->next = newhead;
            continue;
        }
        new = container_of(newhead, struct boy, p);
        if(tmp->age < new->age) {
            find->next = newhead;
            find->pre = newhead->pre;
            newhead->pre->next = find;
            newhead->pre = find;
            newhead = find;
            continue;
        }

        list = newhead;
        do {
            key = container_of(list, struct boy, p);
            if(key->age > tmp->age)
                    break;
            list = list->next;
        } while(list != newhead);

        if(key->age < tmp->age) {
            list->next = find;
            find->pre = list;
            find->next = newhead;
            newhead->pre = find;
        }
        else {
            find->next = list;
            find->pre = list->pre;
            list->pre->next = find;
            list->pre = find;
        }
    }
    return newhead;
}

void show(struct person *head)
{
    struct person *tmp = NULL;
    struct boy *find = NULL;
    tmp = head;
    do {
        find = container_of(tmp, struct boy, p);
        printf("age is %d\n", find->age);
        tmp = tmp->next;    

    } while(tmp != head);

    printf("-------------------------------------\n");
    do {
        find = container_of(tmp, struct boy, p);
        printf("age is %d\n", find->age);
        tmp = tmp->pre;    

    } while(tmp != head);
}