134 lines
3.2 KiB
C++
134 lines
3.2 KiB
C++
/*
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* Copyright (C) 2016-2018 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <assert.h>
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#include "lua/luastate.h"
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// from lauxlib.c
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static int panic (lua_State *L) {
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lua_writestringerror("PANIC: unprotected error in call to Lua API (%s)\n",
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lua_tostring(L, -1));
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return 0; /* return to Lua to abort */
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}
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LuaState::LuaState(bool enable_sandbox, bool rt_safe)
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: L (luaL_newstate ())
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{
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assert (L);
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init ();
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if (enable_sandbox) {
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sandbox (rt_safe);
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} else {
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do_command ("os.exit = nil os.setlocale = nil");
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}
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}
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LuaState::LuaState(lua_State *ls)
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: L (ls)
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{
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assert (L);
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init ();
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sandbox (true);
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}
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LuaState::~LuaState() {
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lua_close (L);
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}
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void
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LuaState::init() {
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lua_atpanic (L, &panic);
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luaL_openlibs (L);
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lua_pushlightuserdata (L, this);
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lua_pushcclosure (L, &LuaState::_print, 1);
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lua_setglobal (L, "print");
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}
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int
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LuaState::do_command (std::string cmd) {
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int result = luaL_dostring (L, cmd.c_str());
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if (result != 0) {
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print ("Error: " + std::string (lua_tostring (L, -1)));
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}
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return result;
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}
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int
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LuaState::do_file (std::string fn) {
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int result = luaL_dofile (L, fn.c_str());
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if (result != 0) {
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print ("Error: " + std::string (lua_tostring (L, -1)));
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}
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return result;
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}
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void
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LuaState::collect_garbage () const {
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lua_gc (L, LUA_GCCOLLECT, 0);
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}
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void
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LuaState::collect_garbage_step (int debt) {
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lua_gc (L, LUA_GCSTEP, debt);
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}
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void
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LuaState::tweak_rt_gc () {
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/* GC runs same speed as memory allocation */
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lua_gc (L, LUA_GCSETPAUSE, 100);
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lua_gc (L, LUA_GCSETSTEPMUL, 100);
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}
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void
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LuaState::sandbox (bool rt_safe) {
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do_command ("dofile = nil require = nil dofile = nil package = nil debug = nil os.exit = nil os.setlocale = nil rawget = nil rawset = nil coroutine = nil module = nil");
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if (rt_safe) {
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do_command ("os = nil io = nil loadfile = nil");
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}
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}
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void
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LuaState::print (std::string text) {
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Print (text); /* EMIT SIGNAL */
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}
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int
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LuaState::_print (lua_State *L) {
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LuaState* const luaState = static_cast <LuaState*> (lua_touserdata (L, lua_upvalueindex (1)));
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std::string text;
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int n = lua_gettop(L); /* number of arguments */
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int i;
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lua_getglobal(L, "tostring");
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for (i=1; i<=n; i++) {
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const char *s;
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size_t l;
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lua_pushvalue(L, -1); /* function to be called */
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lua_pushvalue(L, i); /* value to print */
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lua_call(L, 1, 1);
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s = lua_tolstring(L, -1, &l); /* get result */
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if (s == NULL)
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return luaL_error(L, "'tostring' must return a string to 'print'");
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if (i > 1) text += " ";
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text += std::string (s, l);
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lua_pop(L, 1); /* pop result */
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}
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luaState->print (text);
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return 0;
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}
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