linux c 生成uuid

时间:2024-01-03 12:28:14
/********方法一**********/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/**
* Create random UUID
*
* @param buf - buffer to be filled with the uuid string
*/
char *random_uuid( char buf[37] )
{
const char *c = "89ab";
char *p = buf;
int n;
for( n = 0; n < 16; ++n )
{
int b = rand()%255;
switch( n )
{
case 6:
sprintf(p, "4%x", b%15 );
break;
case 8:
sprintf(p, "%c%x", c[rand()%strlen(c)], b%15 );
break;
default:
sprintf(p, "%02x", b);
break;
} p += 2;
switch( n )
{
case 3:
case 5:
case 7:
case 9:
*p++ = '-';
break;
}
}
*p = 0;
return buf;
} void main()
{
char guid[37];
random_uuid(guid);
printf("guid = %s\n", guid);
random_uuid(guid);
printf("guid = %s\n", guid);
random_uuid(guid);
printf("guid = %s\n", guid);
random_uuid(guid);
printf("guid = %s\n", guid);
}

  运行如下:

daniel@debian:~/src$ gcc getuuid.c
daniel@debian:~/src$ ./a.out
guid = a397a255-53be-41fc-996b-521413e9e22d
guid = 518e1f56-0857-49a7-a5d0-528277751b99
guid = 4aed583d-6a52-49d5-b668-8ead955f3c35
guid = b5c48cdd-6c11-453d-91b4-59cfce233d27
daniel@debian:~/src$

 

/********方法二**********/
/*libuuid是一个用于生成UUID的C库,具体用法参考http://linux.die.net/man/3/libuuid,示例如下:*/ #include <stdio.h>
#include <uuid/uuid.h> int main(int argc, char **argv)
{
uuid_t uuid;
char str[36]; uuid_generate(uuid);
uuid_unparse(uuid, str); printf("%s\n", str); return 0;
}
在Linux下编译时需要链接uuid库 gcc -o uuid uuid.c -luuid
在Ubuntu中,可以用下面的命令安装libuuid: sudo apt-get install uuid-dev