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Hi José,
One trick I picked up in the IRC channel (don't remember who told me, sorry) is to use function arguments instead of globals.
So if you have arguments a, b, c that you want to provide to the user provided snippet, you do like this: 

0. snippet is user provided script
1. snippetFunction = "return function(a, b, c) " + snippet + " end"
2. load buffer with snippetFunction and pcall to make the function end up on the top of the stack 
3. push the arguments a,b,c to the stack
4. pcall the function which will execute the user provided snippet

Hope that helps!

Cheers,
 Jonas

Zé Pedro wrote:
I've seen a similar question already answered in the list but I'm not sure it applies to my problem. In my program I'm executing lua code made by users and I have no control over it. What I'm doing now is setting the variables the code needs by doing: 
                     lua_pushinteger(pLuaState, (int)atoi(value.c_str()));
                     lua_setglobal(pLuaState, name.c_str());

and then executing the script doing:
                     luaL_dostring (pLuaState, script.c_str())
the thing is that the script has no functions or anything, just calls to methods and declaration of variables. Once a script is executed the variables should be cleared but this must be made in C after the luaL_dostring call. Is there any way to do this or do I have to create a new LuaState for each time I execute a script? 

thanks,
José Tavares

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