/*

*@brief  获取U盘挂载路径

*@param  获取的挂载路径

*@return 成功返回0.失败返回-1

*/

static int GetUDiskMountPath(char * mnt_path)

{

    int fd = 0, ret = 0, rdsize = 0;

    char buf[1024] = {0};

    fd = open("./extendevinfo.txt", O_CREAT | O_RDWR | O_NONBLOCK | O_TRUNC, 0777);

    if(fd < 0)

    {

        printf("open error\n");

        return - 1;

    }

    ret = system("df -h |grep mnt >./extendevinfo.txt");

    if(ret)

    {

    //    printf("system error\n");

        return - 1;

    }

    rdsize = read(fd, buf, sizeof(buf));

//    printf("buf = %s\n", buf);

    if(rdsize < 2)

    {

        printf("read error\n");

        return - 1;

    }

    ret = analysis_monut_info(buf, mnt_path);

    close(fd);

    return ret;

}

/*

*@brief  从buf中返回最后一组为/mnt/exUDISK为挂载路径

eg:/dev/sda                 14.6G      9.6G      5.0G  66% /mnt/exUDISK

*@param  获取的挂载路径

*@return 成功返回0.失败返回-1

*/

static int analysis_monut_info(char *buf, char *path)

{

    char *info = buf;

    char value[128] = {0};

    int ret = 1;

//    printf("@buf %s", buf);

    while(0 != ret)

    {

        sprintf(path, "%s", value);

        memset(value, 0, sizeof(value));

        ret = get_info_value(&info, value);

    }

    return ret;

}

/*

*@brief  从buf中返回用空格和换行为分隔符的部分。并向前移动地址位置。

*@param  info 查找的源，value 返回的字符串

*@return 成功返回0.失败返回-1

*/

static int get_info_value(char **info, char *value)

{

    char *vernier = 0;

    int i = 0;

    vernier = *info;

    while((*vernier == ' ') || (*vernier == '\n'))

    {

        vernier++;

    }

    for(i = 0; *vernier != 32 && *vernier != '\n' && *vernier != '\0' && i < 64;i++)

    {

        value[i] = *vernier;

        vernier++;

    }

    if(*vernier == '\0')

    {

        return 0;

    }

    *info = vernier;

    return - 1;

}