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