inline int qs_strncmp(const char * s, const char * qs, size_t n)
{
    int i=0;
    unsigned char u1, u2, unyb, lnyb;

    while(n-- > 0)
    {
        u1 = static_cast<unsigned char>(*s++);
        u2 = static_cast<unsigned char>(*qs++);

        if ( ! CROW_QS_ISQSCHR(u1) ) {  u1 = '\0';  }
        if ( ! CROW_QS_ISQSCHR(u2) ) {  u2 = '\0';  }

        if ( u1 == '+' ) {  u1 = ' ';  }
        if ( u1 == '%' ) // easier/safer than scanf
        {
            unyb = static_cast<unsigned char>(*s++);
            lnyb = static_cast<unsigned char>(*s++);
            if ( CROW_QS_ISHEX(unyb) && CROW_QS_ISHEX(lnyb) )
                u1 = (CROW_QS_HEX2DEC(unyb) * 16) + CROW_QS_HEX2DEC(lnyb);
            else
                u1 = '\0';
        }

        if ( u2 == '+' ) {  u2 = ' ';  }
        if ( u2 == '%' ) // easier/safer than scanf
        {
            unyb = static_cast<unsigned char>(*qs++);
            lnyb = static_cast<unsigned char>(*qs++);
            if ( CROW_QS_ISHEX(unyb) && CROW_QS_ISHEX(lnyb) )
                u2 = (CROW_QS_HEX2DEC(unyb) * 16) + CROW_QS_HEX2DEC(lnyb);
            else
                u2 = '\0';
        }

        if ( u1 != u2 )
            return u1 - u2;
        if ( u1 == '\0' )
            return 0;
        i++;
    }
    if ( CROW_QS_ISQSCHR(*qs) )
        return -1;
    else
        return 0;
}