C语言中实现通用双链表

* C 和 C++ 的谁好谁坏的争论还在不断的继续，C语言的使用非常的广范，很多大型的系统都是用C 语言来写的。

* C++ 似乎有更好的编程范式。支持面向对象，模版，省去了很多处理。

* C++ 最好不要滥用，具体问题，具体分析。

*

*/

#include

#include

/**

* 通用链表声明部分

*/

struct list_head {

struct list_head *next, *prev;

};

#define LIST_HEAD_INIT(name) { &(name), &(name) }

#define LIST_HEAD(name) \

struct list_head name = LIST_HEAD_INIT(name)

#define INIT_LIST_HEAD(ptr) do { \

(ptr)->next = (ptr); (ptr)->prev = (ptr); \

} while (0)

static void __list_add(struct list_head * new, struct list_head * prev, struct list_head * next);

static void list_add(struct list_head *new, struct list_head *head);

static void list_add_tail(struct list_head *new, struct list_head *head);

static void __list_del(struct list_head * prev, struct list_head * next);

static void list_del(struct list_head *entry);

static void list_del_init(struct list_head *entry);

static int list_empty(struct list_head *head);

static void list_splice(struct list_head *list, struct list_head *head);

#define list_entry(ptr, type, member) \

((type *)((char *)(ptr)-(size_t)(&((type *)0)->member)))

#define list_for_each(pos, head) \

for (pos = (head)->next; pos != (head); pos = pos->next)

#define NEW_LIST_NODE(type, node) \

{\

node = (struct type *)malloc( sizeof(struct type)); \

if (node == NULL) exit(-1);\

}

#define FREE_LIST(type, p, list_name)\

{\

struct type *posnode;\

while(!list_empty(&(p)->list_name)) {\

posnode = list_entry((&(p)->list_name)->next, type, list_name);\

list_del((&(p)->list_name)->next);\

free(posnode);\

}\

}

/**

* 通用链表实现部分

*/

static void __list_add(struct list_head * new, struct list_head * prev, struct list_head * next)

{

next->prev = new;

new->next = next;

new->prev = prev;

prev->next = new;

}

static void list_add(struct list_head *new, struct list_head *head)

{

__list_add(new, head, head->next);

}

static void list_add_tail(struct list_head *new, struct list_head *head)

{

__list_add(new, head->prev, head);

}

static void __list_del(struct list_head * prev, struct list_head * next)

{

next->prev = prev;

prev->next = next;

}

static void list_del(struct list_head *entry)

{

__list_del(entry->prev, entry->next);

}

static void list_del_init(struct list_head *entry)

{

__list_del(entry->prev, entry->next);

INIT_LIST_HEAD(entry);

}

static int list_empty(struct list_head *head)

{

return head->next == head;

}

static void list_splice(struct list_head *list, struct list_head *head)

{

struct list_head *first = list->next;

if (first != list) {

struct list_head *last = list->prev;

struct list_head *at = head->next;

first->prev = head;

head->next = first;

last->next = at;

at->prev = last;

}

}

typedef struct int_list

{

struct list_head list;

int data;

} int_list, *pint_list;

void test_int_list()

{

struct int_list *dlink, *newnode, *posnode;

struct list_head *pos;

int i;

NEW_LIST_NODE(int_list, dlink);

INIT_LIST_HEAD(&dlink->list);

for (i = 1; i < 10; i++)

{

NEW_LIST_NODE(int_list, newnode);

newnode->data = i;

list_add_tail(&newnode->list, &dlink->list);

}

list_for_each(pos, &dlink->list) {

posnode = list_entry(pos, int_list, list);

printf("%d ", posnode->data);

}

FREE_LIST(int_list, dlink, list);

printf("\n");

}

typedef struct string_list

{

struct list_head list;

char *data;

} string_list, *pstring_list;

void test_string_list()

{

char * strings[] = {

"我们",

"都是",

"中国",

"人"

};

struct string_list *dlink, *newnode, *posnode;

struct list_head *pos;

int i, length;

length = sizeof(strings) / sizeof(char *);

NEW_LIST_NODE(string_list, dlink);

INIT_LIST_HEAD(&dlink->list);

for (i = 0; i < length; i++)

{

NEW_LIST_NODE(string_list, newnode);

newnode->data = strings[i];

list_add(&newnode->list, &dlink->list);

}

list_for_each(pos, &dlink->list) {

posnode = list_entry(pos, string_list, list);

printf("%s ", posnode->data);

}

FREE_LIST(string_list, dlink, list);

printf("\n");

}

int main()

{

test_int_list();

test_string_list();

}

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