inline int qs_decode(char * qs)
{
    int i=0, j=0;

    while( CROW_QS_ISQSCHR(qs[j]) )
    {
        if ( qs[j] == '+' ) {  qs[i] = ' ';  }
        else if ( qs[j] == '%' ) // easier/safer than scanf
        {
            if ( ! CROW_QS_ISHEX(qs[j+1]) || ! CROW_QS_ISHEX(qs[j+2]) )
            {
                qs[i] = '\0';
                return i;
            }
            qs[i] = (CROW_QS_HEX2DEC(qs[j+1]) * 16) + CROW_QS_HEX2DEC(qs[j+2]);
            j+=2;
        }
        else
        {
            qs[i] = qs[j];
        }
        i++;  j++;
    }
    qs[i] = '\0';

    return i;
}