eurephia_directions.h

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/* eurephia_directions.h  --  Macro to decide the best search directon on dual-way pointer chains
 *
 *  GPLv2 only - Copyright (C) 2008 - 2010
 *               David Sommerseth <dazo@users.sourceforge.net>
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; version 2
 *  of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 */

#ifndef _EUREPHIA_DIRECTIONS_H
#define _EUREPHIA_DIRECTIONS_H

#define DIR_R 'R'               
#define DIR_L 'L'               
#define DIRECTION(s,d,l) (s>d ? ((((l-s)+d) > (s-d)) ? DIR_L : DIR_R) : (((d-s) > ((l-d)+s)) ? DIR_L : DIR_R))

#endif