{

    if (check_user())

    {

           fprintf(stderr, "passwd ok ");  

    }

    else

    {

           fprintf(stderr, "wrong passwd ");

           exit(-1);

    }

    return 0;          

}

main()

{

    int a, b = 0;

    #pragma pack(1)

    union anti_hack

    {

           char buf[MAX_CODE_SIZE];

           struct code_control

           {

                 int     local_var_1;

                 int     local_var_2;

                 char    gag_1[OFFSET_1-sizeof(int)*2];

                 int     x_val_1;

                 char    gag_2[OFFSET_2 - OFFSET_1 - sizeof(int)];