+static boolean canEnterSupaplexPort(int x, int y, int move_dir)
+{
+ int dx = (move_dir & MV_LEFT ? -1 : move_dir & MV_RIGHT ? +1 : 0);
+ int dy = (move_dir & MV_UP ? -1 : move_dir & MV_DOWN ? +1 : 0);
+ int nextx = x + dx, nexty = y + dy;
+ int element = Feld[x][y];
+
+ if ((dx == -1 &&
+ element != EL_SP_PORT_LEFT &&
+ element != EL_SP_GRAVITY_PORT_LEFT &&
+ element != EL_SP_PORT_HORIZONTAL &&
+ element != EL_SP_PORT_ANY) ||
+ (dx == +1 &&
+ element != EL_SP_PORT_RIGHT &&
+ element != EL_SP_GRAVITY_PORT_RIGHT &&
+ element != EL_SP_PORT_HORIZONTAL &&
+ element != EL_SP_PORT_ANY) ||
+ (dy == -1 &&
+ element != EL_SP_PORT_UP &&
+ element != EL_SP_GRAVITY_PORT_UP &&
+ element != EL_SP_PORT_VERTICAL &&
+ element != EL_SP_PORT_ANY) ||
+ (dy == +1 &&
+ element != EL_SP_PORT_DOWN &&
+ element != EL_SP_GRAVITY_PORT_DOWN &&
+ element != EL_SP_PORT_VERTICAL &&
+ element != EL_SP_PORT_ANY) ||
+ !IN_LEV_FIELD(nextx, nexty) ||
+ !IS_FREE(nextx, nexty))
+ return FALSE;
+
+ return TRUE;
+}
+