logging and fixing of live data for bug 2221

additional lua test that failed to find the issue
https://bugs.eressea.de/view.php?id=2221

scripts/tests/e2/e2features.lua

@@ -2,6 +2,29 @@ require "lunit"
 
 module("tests.e2.e2features", package.seeall, lunit.testcase )
 
+function test_build_harbour()
+-- try to reproduce mantis bug 2221
+    local r = region.create(0, 0, "plain")
+    local f = faction.create("harbour@eressea.de", "human", "de")
+    local u = unit.create(f, r)
+    size = 30
+    u.number = 20
+    u:set_skill("building", 3)
+    u:add_item("money", size*250)
+    u:add_item("stone", size*5)
+    u:add_item("log", size*5)
+    u:clear_orders()
+    u:add_order("MACHE HAFEN")
+    process_orders()
+    assert_not_nil(u.building)
+    assert_equal("harbour", u.building.type)
+    assert_equal(20, u.building.size)
+    process_orders()
+    assert_equal(25, u.building.size)
+    process_orders()
+    assert_equal(25, u.building.size)
+end
+
 local function one_unit(r, f)
   local u = unit.create(f, r, 1)
   u:add_item("money", u.number * 100)

src/kernel/build.c

@@ -848,6 +848,7 @@ build_building(unit * u, const building_type * btype, int id, int want, order *
     }
 
     b->size += built;
+    assert(b->type->maxsize <= 0 || b->size <= b->type->maxsize);
     fset(b, BLD_EXPANDED);
 
     update_lighthouse(b);

src/kernel/save.c

@@ -1676,6 +1676,11 @@ int read_game(gamedata *data) {
             if (b->type == bt_lighthouse) {
                 r->flags |= RF_LIGHTHOUSE;
             }
+            // repairs, bug 2221:
+            if (b->type->maxsize>0 && b->size>b->type->maxsize) {
+                log_error("building too big: %s (%s size %d of %d), fixing.", buildingname(b), b->type->_name, b->size, b->type->maxsize);
+                b->size = b->type->maxsize;
+            }
         }
         /* Schiffe */