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(svn r9425) -Codechange/Fix (FS#689): Housekeeping in the convert rail functions: Changed the order of error checks to generate more meaningful error messages, added some doxygen comments and replaced bitshifting by proper mathematical operations

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celestar
2007-03-24 09:12:03 +00:00
parent d5f16924d9
commit 49ff7cb938
4 changed files with 42 additions and 7 deletions
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15
src/rail_cmd.cpp
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@@ -849,15 +849,24 @@ int32 CmdRemoveSignalTrack(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
typedef int32 DoConvertRailProc(TileIndex tile, RailType totype, bool exec);
/**
* Switches the rail type.
* Railtypes are stored on a per-tile basis, not on a per-track basis, so
* all the tracks in the given tile will be converted.
* @param tile The tile on which the railtype is to be convert.
* @param totype The railtype we want to convert to
* @param exec Switches between test and execute mode
* @return The cost and state of the operation
* @retval CMD_ERROR An error occured during the operation.
*/
static int32 DoConvertRail(TileIndex tile, RailType totype, bool exec)
{
if (!CheckTileOwnership(tile)) return CMD_ERROR;
if (!EnsureNoVehicle(tile) && (!IsCompatibleRail(GetRailType(tile), totype) || IsPlainRailTile(tile))) return CMD_ERROR;
// tile is already of requested type?
if (GetRailType(tile) == totype) return CMD_ERROR;
if (!EnsureNoVehicle(tile) && (!IsCompatibleRail(GetRailType(tile), totype) || IsPlainRailTile(tile))) return CMD_ERROR;
// 'hidden' elrails can't be downgraded to normal rail when elrails are disabled
if (_patches.disable_elrails && totype == RAILTYPE_RAIL && GetRailType(tile) == RAILTYPE_ELECTRIC) return CMD_ERROR;