Revert "Merge branch 'lightmemedata' into 'next'"

This reverts commit d4c08a8410, reversing
changes made to e100f21dda.

src/lua_baselib.c

@@ -242,16 +242,10 @@ static const char *GetUserdataUType(lua_State *L)
 //   or players[0].powers -> "player_t.powers"
 static int lib_userdataType(lua_State *L)
 {
-	int type;
 	lua_settop(L, 1); // pop everything except arg 1 (in case somebody decided to add more)
-	type = lua_type(L, 1);
-	if (type == LUA_TLIGHTUSERDATA || type == LUA_TUSERDATA)
-	{
-		lua_pushstring(L, GetUserdataUType(L));
-		return 1;
-	}
-	else
-		return luaL_typerror(L, 1, "userdata");
+	luaL_checktype(L, 1, LUA_TUSERDATA);
+	lua_pushstring(L, GetUserdataUType(L));
+	return 1;
 }
 
 // Takes a metatable as first and only argument

src/lua_consolelib.c

@@ -440,8 +440,22 @@ static int lib_cvRegisterVar(lua_State *L)
 
 static int lib_cvFindVar(lua_State *L)
 {
-	LUA_PushLightUserdata(L, CV_FindVar(luaL_checkstring(L,1)), META_CVAR);
-	return 1;
+	consvar_t *cv;
+	if (( cv = CV_FindVar(luaL_checkstring(L,1)) ))
+	{
+		lua_settop(L,1);/* We only want one argument in the stack. */
+		lua_pushlightuserdata(L, cv);/* Now the second value on stack. */
+		luaL_getmetatable(L, META_CVAR);
+		/*
+		The metatable is the last value on the stack, so this
+		applies it to the second value, which is the cvar.
+		*/
+		lua_setmetatable(L,2);
+		lua_pushvalue(L,2);
+		return 1;
+	}
+	else
+		return 0;
 }
 
 static int CVarSetFunction

src/lua_script.c

@@ -714,27 +714,6 @@ fixed_t LUA_EvalMath(const char *word)
 	return res;
 }
 
-/*
-LUA_PushUserdata but no userdata is created.
-You can't invalidate it therefore.
-*/
-
-void LUA_PushLightUserdata (lua_State *L, void *data, const char *meta)
-{
-	if (data)
-	{
-		lua_pushlightuserdata(L, data);
-		luaL_getmetatable(L, meta);
-		/*
-		The metatable is the last value on the stack, so this
-		applies it to the second value, which is the userdata.
-		*/
-		lua_setmetatable(L, -2);
-	}
-	else
-		lua_pushnil(L);
-}
-
 // Takes a pointer, any pointer, and a metatable name
 // Creates a userdata for that pointer with the given metatable
 // Pushes it to the stack and stores it in the registry.

src/lua_script.h

@@ -87,7 +87,6 @@ typedef enum {
 	LPUSHED_EXISTING,
 } lpushed_t;
 
-void LUA_PushLightUserdata(lua_State *L, void *data, const char *meta);
 void LUA_PushUserdata(lua_State *L, void *data, const char *meta);
 lpushed_t LUA_RawPushUserdata(lua_State *L, void *data);