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authoralberth <alberth@openttd.org>2010-02-21 14:57:27 +0000
committeralberth <alberth@openttd.org>2010-02-21 14:57:27 +0000
commit676a8bda3e11abc4c1c5d044f993b7d6cd87d0bb (patch)
tree2a1737992dfa47b79d6610f827f41f3a6525449a /src
parent50bdd29758d2e15f61500d18ddbb4381ac7882e3 (diff)
downloadopenttd-676a8bda3e11abc4c1c5d044f993b7d6cd87d0bb.tar.xz
(svn r19183) -Codechange: Return CommandCost from FindTownForIndustry().
Diffstat (limited to 'src')
-rw-r--r--src/industry_cmd.cpp33
1 files changed, 18 insertions, 15 deletions
diff --git a/src/industry_cmd.cpp b/src/industry_cmd.cpp
index 66f83aa14..81d3a8229 100644
--- a/src/industry_cmd.cpp
+++ b/src/industry_cmd.cpp
@@ -1270,27 +1270,27 @@ static CheckNewIndustryProc * const _check_new_industry_procs[CHECK_END] = {
/** Find a town for the industry, while checking for multiple industries in the same town.
* @param tile Position of the industry to build.
* @param type Industry type.
- * @param [out] err_mesg Error message, if any.
- * @return Town for the new industry, \c NULL if no good town can be found.
+ * @param [out] town Pointer to return town for the new industry, \c NULL is written if no good town can be found.
+ * @return Succeeded or failed command.
+ *
+ * @precond \c *t != NULL
+ * @postcon \c *t points to a town on success, and \c NULL on failure.
*/
-static const Town *FindTownForIndustry(TileIndex tile, int type)
+static CommandCost FindTownForIndustry(TileIndex tile, int type, const Town **t)
{
- const Town *t;
- const Industry *i;
-
- t = ClosestTownFromTile(tile, UINT_MAX);
+ *t = ClosestTownFromTile(tile, UINT_MAX);
- if (_settings_game.economy.multiple_industry_per_town) return t;
+ if (_settings_game.economy.multiple_industry_per_town) return CommandCost();
+ const Industry *i;
FOR_ALL_INDUSTRIES(i) {
- if (i->type == (byte)type &&
- i->town == t) {
- _error_message = STR_ERROR_ONLY_ONE_ALLOWED_PER_TOWN;
- return NULL;
+ if (i->type == (byte)type && i->town == *t) {
+ *t = NULL;
+ return_cmd_error(STR_ERROR_ONLY_ONE_ALLOWED_PER_TOWN);
}
}
- return t;
+ return CommandCost();
}
bool IsSlopeRefused(Slope current, Slope refused)
@@ -1708,8 +1708,11 @@ static Industry *CreateNewIndustryHelper(TileIndex tile, IndustryType type, DoCo
ret.SetGlobalErrorMessage();
if (ret.Failed()) return NULL;
- const Town *t = FindTownForIndustry(tile, type);
- if (t == NULL) return NULL;
+ const Town *t = NULL;
+ ret = FindTownForIndustry(tile, type, &t);
+ ret.SetGlobalErrorMessage();
+ if (ret.Failed()) return NULL;
+ assert(t != NULL);
ret = CheckIfIndustryIsAllowed(tile, type, t);
ret.SetGlobalErrorMessage();