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+#ifndef food_h
+#define food_h
+/* food.h */
+/* io - Input & Output with Artificial Intelligence (ai) support on AVR. {{{
+ *
+ * Copyright (C) 2010 Nicolas Schodet
+ *
+ * APBTeam:
+ * Web: http://apbteam.org/
+ * Email: team AT apbteam DOT org
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * }}} */
+
+/**
+ * Tools for playing element for Eurobot 2010.
+ *
+ * Elements are oranges, tomatoes and corns. We only handle tomatoes and
+ * corns.
+ */
+
+/** Return whether a food is blocking robot movements.
+ * - food: considered food, or 0xff.
+ * 0xff is accepted as a convenience for the user, it always return false. */
+uint8_t
+food_blocking (uint8_t food);
+
+/** Return whether a food is blocking a line segment.
+ * - a: line segment first point.
+ * - b: line segment second point.
+ * - ab: line segment length.
+ * - returns: 1 if the path should not be used. */
+uint8_t
+food_blocking_path (vect_t a, vect_t b, int16_t ab);
+
+#endif /* food_h */