linux c uuid guid 生成

爱被打了一巴掌 2021-07-28 20:57 495阅读 0赞

方法一：随机生成

#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：使用 libuuid 库生成

/*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`