Function checktype

lib/lua/src/luasocket.c:70–77

}

static void *checktype(lua_State *L, int index, const char *typename) {
  if (strcmp(typename, SOCKET_ANY) == 0 ||
      strcmp(typename, SOCKET_CONN) == 0) {
    return checkgroup(L, index, typename);
  } else {
    return luaL_checkudata(L, index, typename);
  }
}

static void settype(lua_State *L, int index, const char *typename) {
  luaL_getmetatable(L, typename);