1 files changed, 26 insertions, 0 deletions
diff --git a/src/tunnelbridge.h b/src/tunnelbridge.h
new file mode 100644
index 000000000..758ba59a5
--- /dev/null
+++ b/src/tunnelbridge.h
@@ -0,0 +1,26 @@
+/* $Id$ */
+
+/** @file tunnelbridge.h Header file for things common for tunnels and bridges */
+
+#ifndef TUNNELBRIDGE_H
+#define TUNNELBRIDGE_H
+
+#include "tile_type.h"
+#include "map_func.h"
+#include "tunnelbridge_map.h"
+
+/**
+ * Calculates the length of a tunnel or a bridge (without end tiles)
+ * @return length of bridge/tunnel middle
+ */
+static inline uint GetTunnelBridgeLength(TileIndex begin, TileIndex end)
+{
+	int x1 = TileX(begin);
+	int y1 = TileY(begin);
+	int x2 = TileX(end);
+	int y2 = TileY(end);
+
+	return abs(x2 + y2 - x1 - y1) - 1;
+}
+
+#endif /* TUNNELBRIDGE_H */