From Lua 5.2: Add lua_version().

Contributed by François Perrad.

src/lj_api.c

@@ -112,6 +112,13 @@ LUA_API void lua_xmove(lua_State *from, lua_State *to, int n)
   from->top = f;
 }
 
+LUA_API const lua_Number *lua_version(lua_State *L)
+{
+  static const lua_Number version = LUA_VERSION_NUM;
+  UNUSED(L);
+  return &version;
+}
+
 /* -- Stack manipulation -------------------------------------------------- */
 
 LUA_API int lua_gettop(lua_State *L)