From 7175c87140bbe41fbe488ae58473565834bb7a56 Mon Sep 17 00:00:00 2001
From: Enno Rehling <enno@eressea.de>
Date: Tue, 4 Aug 2009 15:29:07 +0000
Subject: [PATCH] disallow building other people's castles

---
 src/common/kernel/build.c | 11 +++++++++++
 src/res/e3a.xml           |  1 +
 2 files changed, 12 insertions(+)

diff --git a/src/common/kernel/build.c b/src/common/kernel/build.c
index 6d296ab7e..67087897b 100644
--- a/src/common/kernel/build.c
+++ b/src/common/kernel/build.c
@@ -827,6 +827,7 @@ build_building(unit * u, const building_type * btype, int want, order * ord)
   const char * btname;
   order * new_order = NULL;
   const struct locale * lang = u->faction->locale;
+  static int rule_other = -1;
 
   assert(u->number);
   if (eff_skill(u, SK_BUILDING, r) == 0) {
@@ -881,6 +882,16 @@ build_building(unit * u, const building_type * btype, int want, order * ord)
     }
     n = 1;
   }
+  if (rule_other<0) {
+    rule_other = get_param_int(global.parameters, "rules.build.other_buildings", 1);
+  }
+  if (!rule_other) {
+    unit * owner = buildingowner(r, b);
+    if (!owner || owner->faction!=u->faction) {
+      cmistake(u, ord, 1222, MSG_PRODUCE);
+      return;
+    }
+  }
 
   if (b) built = b->size;
   if (n<=0 || n == INT_MAX) {
diff --git a/src/res/e3a.xml b/src/res/e3a.xml
index 3d96aa4b5..34a6a5fcd 100644
--- a/src/res/e3a.xml
+++ b/src/res/e3a.xml
@@ -160,6 +160,7 @@
     <param name="rules.magic.common" value="tybied"/> <!-- tybied spells can be cast by anyone -->
     <param name="rules.magic.elfpower" value="1"/> <!-- elves get ring-of-power bonus in a forest -->
     <param name="rules.magic.playerschools" value="gwyrrd illaun draig cerddor"/>
+    <param name="rules.build.other_buildings" value="0"/>
     <param name="rules.economy.taxation" value="1"/>
     <param name="rules.economy.food" value="2"/>
     <param name="rules.economy.wages" value="1"/>