/* get horizontal units */
_ghunits(s, item, member)
{
        local hu;

        if (argc == 2)   /* assume item, member */
        {
                hu = gethunits(s, item);
        }
        else
        {
                hu = (argc > 0) ? gethunits(s) : gethunits;
        }

        if (strlen(hu) == 0)
        {
                /* get default units */
                hu = _gethunits;
        }
        return(hu);
}