1 /* There is some amount of overlap with <sys/types.h> as known by inet code */
 2 #ifndef __int8_t_defined
 3 # define __int8_t_defined
 4 typedef signed char         int8_t;
 5 typedef short int        　 int16_t;
 6 typedef int            　　 int32_t;
 7 # if __WORDSIZE == 64
 8 typedef long int       　　　int64_t;
 9 # else
10 __extension__
11 typedef long long int        int64_t;
12 # endif
13 #endif
14
15 /* Unsigned.  */
16 typedef unsigned char         uint8_t;
17 typedef unsigned short int    uint16_t;
18 #ifndef __uint32_t_defined
19 typedef unsigned int          uint32_t;
20 # define __uint32_t_defined
21 #endif
22 #if __WORDSIZE == 64
23 typedef unsigned long int       uint64_t;
24 #else
25 __extension__
26 typedef unsigned long long int    uint64_t;
27 #endif

 1 /* Types for `void *' pointers.  */
 2 #if __WORDSIZE == 64
 3 # ifndef __intptr_t_defined
 4 typedef long int               intptr_t;
 5 #  define __intptr_t_defined
 6 # endif
 7 typedef unsigned long int    uintptr_t;
 8 #else
 9 # ifndef __intptr_t_defined
10 typedef int                    intptr_t;
11 #  define __intptr_t_defined
12 # endif
13 typedef unsigned int        uintptr_t;
14 #endif

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <unistd.h>
 4 #include <stdint.h>
 5 #include <string.h>
 6 #include <assert.h>
 7
 8 #define ID_STR_LEN   12
 9 #define NAME_STR_LEN 10
10
11 typedef struct student
12 {
13     char id[ID_STR_LEN];
14     char name[NAME_STR_LEN];
15     uint8_t age;
16 }student;
17
18 student * create_student()
19 {
20     student *stu = (student *)malloc(sizeof(student));
21     if (stu == NULL)
22     return NULL;
23     memset(stu, 0, sizeof(student));
24     return stu;
25 }
26
27 void *free_student(student *stu)
28 {
29     if (stu)
30     free(stu);
31 }
32
33 static void init_student(student * stu)
34 {
35     assert(stu);
36     const char *id = "2013112210";
37     const char *name = "Anker";
38     uint8_t age = 21;
39     memcpy(stu->id, id, strlen(id));
40     memcpy(stu->name, name, strlen(name));
41     stu->age = age;
42 }
43
44 static int handle_student(intptr_t handle)
45 {
46     if (handle == 0)
47     {
48     return -1;
49     }
50     student *stu = (student*)handle;
51     printf("id: %s\n", stu->id);
52     printf("name: %s\n", stu->name);
53     printf("age: %u\n", stu->age);
54     return 0;
55 }
56
57 int main()
58 {
59     student *stu;
60     stu = create_student();
61     init_student(stu);
62     //将指针转换为intptr_t类型
63     intptr_t handle = (intptr_t)stu;
64     handle_student(handle);
65     free_student(stu);
66     return 0;
67 }