Untitled

/* This function removes the unsafe built-in functions from a Lua 5.1 virtual
 * machine. DO NOT USE THIS IN OTHER VERSIONS OF LUA UNLESS YOU KNOW WHAT YOU
 * DOING, OTHERWISE NEW UNSAFE FUNCTIONS MIGHT REMAIN. THIS DOES NOT UNDEFINE
 * THE FUNCTIONS FROM LUALIB.H, WHICH ARE INSTALLED WITH LUAL_OPENLIBS().
 *
 * Any functions that you define that are unsafe will be uneffected by this
 * function. The purpose of this is if you are probing for settings. Scripts
 * will no longer be able to include other files.
 *
 * Copyright (C) 2011 by Entertaining Software, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE. */

#include <assert.h>

#include <lua.h>

void
remove_unsafe_builtins (lua_State *vm)
{
  assert (vm);

  lua_pushnil (vm);
  lua_setglobal (vm, "dofile");

  lua_pushnil (vm);
  lua_setglobal (vm, "loadfile");

  lua_pushnil (vm);
  lua_setglobal (vm, "require");
}