int strcmpx(unsigned char s1[], unsigned char s2[])
{
    int i;

    for (i = 0; ; i++) {
        if ((i >= strlen(s1)) && i < strlen(s2)) return -1;
        if ((i >= strlen(s2)) && i < strlen(s1)) return 1;
        if ((i >= strlen(s2)) && i >= strlen(s1)) return 0;

        if (s1[i] - s2[i] != 0) return s1[i] - s2[i];
    }
    return 0;
}