3 files changed, 43 insertions, 27 deletions

diff --git a/src/script/common/c_content.cpp b/src/script/common/c_content.cpp
index 74e1b0956..899e1c536 100644
--- a/src/script/common/c_content.cpp
+++ b/src/script/common/c_content.cpp
@@ -840,23 +840,32 @@ void push_hit_params(lua_State *L,const HitParams &params)
 }
 
 /******************************************************************************/
-u32 getflagsfield(lua_State *L, int table, const char *fieldname,
-	FlagDesc *flagdesc, u32 *flagmask)
+
+bool getflagsfield(lua_State *L, int table, const char *fieldname,
+	FlagDesc *flagdesc, u32 *flags, u32 *flagmask)
 {
-	u32 flags = 0;
-	
 	lua_getfield(L, table, fieldname);
 
-	if (lua_isstring(L, -1)) {
-		std::string flagstr = lua_tostring(L, -1);
-		flags = readFlagString(flagstr, flagdesc, flagmask);
-	} else if (lua_istable(L, -1)) {
-		flags = read_flags_table(L, -1, flagdesc, flagmask);
-	}
+	bool success = read_flags(L, -1, flagdesc, flags, flagmask);
 
 	lua_pop(L, 1);
 
-	return flags;
+	return success;
+}
+
+bool read_flags(lua_State *L, int index, FlagDesc *flagdesc,
+	u32 *flags, u32 *flagmask)
+{
+	if (lua_isstring(L, index)) {
+		std::string flagstr = lua_tostring(L, index);
+		*flags = readFlagString(flagstr, flagdesc, flagmask);
+	} else if (lua_istable(L, index)) {
+		*flags = read_flags_table(L, index, flagdesc, flagmask);
+	} else {
+		return false;
+	}
+
+	return true;
 }
 
 u32 read_flags_table(lua_State *L, int table, FlagDesc *flagdesc, u32 *flagmask)
diff --git a/src/script/common/c_content.h b/src/script/common/c_content.h
index 9aed5ccfa..f48c673bd 100644
--- a/src/script/common/c_content.h
+++ b/src/script/common/c_content.h
@@ -119,9 +119,14 @@ int                getenumfield              (lua_State *L,
                                               const EnumString *spec,
                                               int default_);
 
-u32                getflagsfield             (lua_State *L, int table,
+bool               getflagsfield             (lua_State *L, int table,
                                               const char *fieldname,
-                                              FlagDesc *flagdesc, u32 *flagmask);
+                                              FlagDesc *flagdesc,
+                                              u32 *flags, u32 *flagmask);
+
+bool               read_flags                (lua_State *L, int index,
+                                              FlagDesc *flagdesc,
+                                              u32 *flags, u32 *flagmask);
 
 u32                read_flags_table          (lua_State *L, int table,
                                               FlagDesc *flagdesc, u32 *flagmask);
diff --git a/src/script/lua_api/l_mapgen.cpp b/src/script/lua_api/l_mapgen.cpp
index f357d3f44..56109a9dd 100644
--- a/src/script/lua_api/l_mapgen.cpp
+++ b/src/script/lua_api/l_mapgen.cpp
@@ -189,9 +189,10 @@ int ModApiMapgen::l_set_mapgen_params(lua_State *L)
 		return 0;
 
 	EmergeManager *emerge = getServer(L)->getEmergeManager();
-	ASSERT(emerge);
+	assert(emerge);
 
 	std::string flagstr;
+	u32 flags = 0, flagmask = 0;
 
 	lua_getfield(L, 1, "mgname");
 	if (lua_isstring(L, -1)) {
@@ -216,13 +217,7 @@ int ModApiMapgen::l_set_mapgen_params(lua_State *L)
 			"see lua_api.txt" << std::endl;
 	}
 
-	lua_getfield(L, 1, "flags");
-	if (lua_isstring(L, -1)) {
-		u32 flags, flagmask;
-
-		flagstr = lua_tostring(L, -1);
-		flags   = readFlagString(flagstr, flagdesc_mapgen, &flagmask);
-
+	if (getflagsfield(L, 1, "flags", flagdesc_mapgen, &flags, &flagmask)) {
 		emerge->params.flags &= ~flagmask;
 		emerge->params.flags |= flags;
 	}
@@ -260,11 +255,13 @@ int ModApiMapgen::l_set_noiseparam_defaults(lua_State *L)
 // set_gen_notify(string)
 int ModApiMapgen::l_set_gen_notify(lua_State *L)
 {
-	if (lua_isstring(L, 1)) {
+	u32 flags = 0, flagmask = 0;
+
+	if (read_flags(L, 1, flagdesc_gennotify, &flags, &flagmask)) {
 		EmergeManager *emerge = getServer(L)->getEmergeManager();
-		emerge->gennotify = readFlagString(lua_tostring(L, 1),
-			flagdesc_gennotify, NULL);
+		emerge->gennotify = flags;
 	}
+
 	return 0;
 }
 
@@ -407,8 +404,11 @@ int ModApiMapgen::l_register_decoration(lua_State *L)
 			break; }
 		case DECO_SCHEMATIC: {
 			DecoSchematic *dschem = (DecoSchematic *)deco;
-			dschem->flags = getflagsfield(L, index, "flags",
-				flagdesc_deco_schematic, NULL);
+
+			dschem->flags = 0;
+			getflagsfield(L, index, "flags", flagdesc_deco_schematic,
+				&dschem->flags, NULL);
+
 			dschem->rotation = (Rotation)getenumfield(L, index,
 				"rotation", es_Rotation, ROTATE_0);
 
@@ -482,8 +482,10 @@ int ModApiMapgen::l_register_ore(lua_State *L)
 	ore->clust_size     = getintfield_default(L, index, "clust_size", 0);
 	ore->height_min     = getintfield_default(L, index, "height_min", 0);
 	ore->height_max     = getintfield_default(L, index, "height_max", 0);
-	ore->flags          = getflagsfield(L, index, "flags", flagdesc_ore, NULL);
 	ore->nthresh        = getfloatfield_default(L, index, "noise_threshhold", 0.);
+	ore->flags          = 0;
+	getflagsfield(L, index, "flags", flagdesc_ore, &ore->flags, NULL);
+
 	lua_getfield(L, index, "wherein");
 	if (lua_istable(L, -1)) {
 		int  i = lua_gettop(L);