/*
 *      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; either version 2 of the License, or
 *      (at your option) any later version.
 *
 *      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.
 */

/* select_player_next: just increment 
 * the value of p as it was a player,
 * from 0 to 3, and turning forever 
 * like this.
 */
void select_player_next(int *p)
{
	if(*p==3)
		*p=0;
	else
		(*p)++;
}

void select_player_prev(int *p)
{
	if(*p==0)
		*p=3;
	else
		(*p)--;
}