is_building_type should be a quicker way to test for a building type than bt_find.

src/kernel/building.c

@@ -158,9 +158,7 @@ const char *buildingtype(const building_type * btype, const building * b, int bs
         s = btype->name(btype, b, bsize);
     }
     if (b && b->attribs) {
-        const struct building_type *bt_generic = bt_find("generic");
-
-        if (btype == bt_generic) {
+        if (is_building_type(btype, "generic")) {
             const attrib *a = a_find(b->attribs, &at_building_generic_type);
             if (a) {
                 s = (const char *)a->data.v;
@@ -390,16 +388,9 @@ building *new_building(const struct building_type * btype, region * r,
 {
     building **bptr = &r->buildings;
     building *b = (building *)calloc(1, sizeof(building));
-    static bool init_lighthouse = false;
-    static const struct building_type *bt_lighthouse = 0;
     const char *bname = 0;
     char buffer[32];
 
-    if (!init_lighthouse) {
-        bt_lighthouse = bt_find("lighthouse");
-        init_lighthouse = true;
-    }
-
     b->no = newcontainerid();
     bhash(b);
 
@@ -409,9 +400,7 @@ building *new_building(const struct building_type * btype, region * r,
         bptr = &(*bptr)->next;
     *bptr = b;
 
-    if (b->type == bt_lighthouse) {
-        r->flags |= RF_LIGHTHOUSE;
-    }
+    update_lighthouse(b);
     if (b->type->name) {
         bname = LOC(lang, buildingtype(btype, b, 0));
     }
@@ -695,3 +684,8 @@ bool in_safe_building(unit *u1, unit *u2) {
     }
     return false;
 }
+
+bool is_building_type(const struct building_type *btype, const char *name) {
+    assert(btype);
+    return name && strcmp(btype->_name, name)==0;
+}

src/kernel/building.h

@@ -163,6 +163,7 @@ extern "C" {
     bool buildingtype_exists(const struct region *r,
         const struct building_type *bt, bool working);
     bool building_is_active(const struct building *b);
+    bool is_building_type(const struct building_type *btype, const char *name);
     struct building *active_building(const struct unit *u, const struct building_type *btype);
 
     extern const char *buildingname(const struct building *b);

src/kernel/building.test.c

@@ -480,6 +480,16 @@ static void test_safe_building(CuTest *tc) {
     test_cleanup();
 }
 
+static void test_building_type(CuTest *tc) {
+    building_type *btype;
+    test_setup();
+    btype = test_create_buildingtype("house");
+    CuAssertIntEquals(tc, true, is_building_type(btype, "house"));
+    CuAssertIntEquals(tc, false, is_building_type(btype, "castle"));
+    CuAssertIntEquals(tc, false, is_building_type(NULL, "house"));
+    test_cleanup();
+}
+
 CuSuite *get_building_suite(void)
 {
     CuSuite *suite = CuSuiteNew();
@@ -494,6 +504,7 @@ CuSuite *get_building_suite(void)
     SUITE_ADD_TEST(suite, test_buildingowner_goes_to_other_after_leave);
     SUITE_ADD_TEST(suite, test_buildingowner_goes_to_same_faction_after_leave);
     SUITE_ADD_TEST(suite, test_buildingowner_goes_to_empty_unit_after_leave);
+    SUITE_ADD_TEST(suite, test_building_type);
     SUITE_ADD_TEST(suite, test_active_building);
     SUITE_ADD_TEST(suite, test_buildingtype_exists);
     SUITE_ADD_TEST(suite, test_safe_building);

src/kernel/config.c

@@ -899,7 +899,6 @@ default_wage(const region * r, const faction * f, const race * rc, int in_turn)
     int esize = 0;
     double wage;
     attrib *a;
-    const building_type *artsculpture_type = bt_find("artsculpture");
     const struct curse_type *ctype;
 
     if (b != NULL) {
@@ -935,7 +934,7 @@ default_wage(const region * r, const faction * f, const race * rc, int in_turn)
 
     /* Artsculpture: Income +5 */
     for (b = r->buildings; b; b = b->next) {
-        if (b->type == artsculpture_type) {
+        if (is_building_type(b->type, "artsculpture")) {
             wage += 5;
         }
     }

src/lighthouse.c

@@ -25,8 +25,7 @@ static attrib_type at_lighthouse = {
 */
 void update_lighthouse(building * lh)
 {
-    const struct building_type *bt_lighthouse = bt_find("lighthouse");
-    if (bt_lighthouse && lh->type == bt_lighthouse) {
+    if (is_building_type(lh->type, "lighthouse")) {
         region *r = lh->region;
         int d = (int)log10(lh->size) + 1;
         int x;

src/reports.c

@@ -1754,11 +1754,9 @@ f_regionid(const region * r, const faction * f, char *buffer, size_t size)
 
 static char *f_regionid_s(const region * r, const faction * f)
 {
-    static int i = 0;
-    static char bufs[4][NAMESIZE + 20]; // FIXME: static return value
-    char *buf = bufs[(++i) % 4];
+    static char buf[NAMESIZE + 20]; // FIXME: static return value
 
-    f_regionid(r, f, buf, NAMESIZE + 20);
+    f_regionid(r, f, buf, sizeof(buf));
     return buf;
 }