(svn r2288) - CodeChange: protected the next batch of commands (41 so far, out of 115).

- CodeChange: changed the airport gui airport-type checking. Added function GetValidAirports() that returns bitmasked availibility, is also used for checking.
- CodeChange: to check tree-planting, 2 const arrays have been moved to table/tree_land.h (type and count)
- CodeChange: added IsTownIndex() in following of IsStationIndex(), etc.
- Fix (regression): road tunnels did not work anymore, forgot that their type was 0x200 (documented now)

1 files changed, 5 insertions, 0 deletions

diff --git a/town.h b/town.h
index b4a588de1..b3e0d4da1 100644
--- a/town.h
+++ b/town.h
@@ -157,6 +157,11 @@ static inline uint16 GetTownPoolSize(void)
 	return _town_pool.total_items;
 }
 
+static inline bool IsTownIndex(uint index)
+{
+	return index < GetTownPoolSize();
+}
+
 #define FOR_ALL_TOWNS_FROM(t, start) for (t = GetTown(start); t != NULL; t = (t->index + 1 < GetTownPoolSize()) ? GetTown(t->index + 1) : NULL)
 #define FOR_ALL_TOWNS(t) FOR_ALL_TOWNS_FROM(t, 0)