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/**
* 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 <stdio.h>
#include <stdlib.h>
/**
* 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();
}
