diff -r b5c2449616b5 -r 66dde6412125 src/command.h
--- a/src/command.h	Sun Jun 17 21:31:00 2007 +0000
+++ b/src/command.h	Tue Jun 26 23:40:58 2007 +0000
@@ -153,6 +153,9 @@
 	CMD_SET_GROUP_REPLACE_PROTECTION = 126,
 
 	CMD_MOVE_ORDER                   = 127,
+	CMD_CHANGE_TIMETABLE             = 128,
+	CMD_SET_VEHICLE_ON_TIME          = 129,
+	CMD_AUTOFILL_TIMETABLE           = 130,
 };
 
 enum {
@@ -163,8 +166,6 @@
 	DC_NO_RAIL_OVERLAP = 0x10, ///< don't allow overlap of rails (used in buildrail)
 	DC_NO_TOWN_RATING  = 0x40, ///< town rating does not disallow you from building
 	DC_FORCETEST       = 0x80, ///< force test too.
-
-	CMD_ERROR = ((int32)0x80000000),
 };
 
 #define CMD_MSG(x) ((x) << 16)
@@ -183,30 +184,23 @@
 	CMD_OFFLINE = 0x2, ///< the command cannot be executed in a multiplayer game; single-player only
 };
 
-typedef int32 CommandProc(TileIndex tile, uint32 flags, uint32 p1, uint32 p2);
+typedef CommandCost CommandProc(TileIndex tile, uint32 flags, uint32 p1, uint32 p2);
 
 struct Command {
 	CommandProc *proc;
 	byte flags;
 };
 
-//#define return_cmd_error(errcode) do { _error_message=(errcode); return CMD_ERROR; } while(0)
-#define return_cmd_error(errcode) do { return CMD_ERROR | (errcode); } while (0)
+static inline bool CmdFailed(CommandCost cost) { return cost.Failed(); }
+static inline bool CmdSucceeded(CommandCost cost) { return cost.Succeeded(); }
 
-/**
- * Check the return value of a DoCommand*() function
- * @param res the resulting value from the command to be checked
- * @return Return true if the command failed, false otherwise
- */
-static inline bool CmdFailed(int32 res)
-{
-	/* lower 16bits are the StringID of the possible error */
-	return res <= (CMD_ERROR | INVALID_STRING_ID);
-}
+static const CommandCost CMD_ERROR = CommandCost((StringID)INVALID_STRING_ID);
+
+#define return_cmd_error(errcode) do { return CommandCost((StringID)(errcode)); } while (0)
 
 /* command.cpp */
 typedef void CommandCallback(bool success, TileIndex tile, uint32 p1, uint32 p2);
-int32 DoCommand(TileIndex tile, uint32 p1, uint32 p2, uint32 flags, uint procc);
+CommandCost DoCommand(TileIndex tile, uint32 p1, uint32 p2, uint32 flags, uint procc);
 bool DoCommandP(TileIndex tile, uint32 p1, uint32 p2, CommandCallback *callback, uint32 cmd);
 
 #ifdef ENABLE_NETWORK
@@ -218,6 +212,6 @@
 
 bool IsValidCommand(uint cmd);
 byte GetCommandFlags(uint cmd);
-int32 GetAvailableMoneyForCommand();
+Money GetAvailableMoneyForCommand();
 
 #endif /* COMMAND_H */