--- a/engine.c Thu Jan 27 20:38:19 2005 +0000
+++ b/engine.c Thu Jan 27 21:00:05 2005 +0000
@@ -906,5 +906,29 @@
{ 'ENGS', LoadSave_ENGS, LoadSave_ENGS, CH_RIFF | CH_LAST},
};
+/*
+ * returns true if an engine is valid, and it is of the specified type, and buildable by the current player, false otherwise
+ *
+ * engine = index of the engine to check
+ * type = the type the engine should be of (VEH_xxx)
+ */
+bool IsEngineBuildable(int engine, byte type) {
+ Engine *e;
+
+ // check if it's an engine that is in the engine array
+ if (0 > engine || engine >= TOTAL_NUM_ENGINES ) return false;
+
+ e = DEREF_ENGINE(engine);
+
+ // check if it's an engine of specified type
+ if (e->type != type) return false;
+
+ // check if it's available
+ if (!HASBIT(e->player_avail, _current_player)) return false;
+
+ return true;
+}
+
+