Re: Replaced print function return stack getting emptied

[Bruce Wheaton <bruce@...>]

On May 6, 2012, at 1:20 PM, Kevin Martin wrote:

> 
> On 6 May 2012, at 17:52, Bruce Wheaton wrote:
> 
>> It gets called and works fine - leave the stack with the original stack, plus a function and my new results, and returns the number of results. It works with 1 or more results.
> 
> From the lua 5.2 manual:
> 
> Whenever Lua calls C, the called function gets a new stack, which is independent of previous stacks and of stacks of C functions that are still active. This stack initially contains any arguments to the C function and it is where the C function pushes its results to be returned to the caller (see lua_CFunction).

OK…. so. I have a C function, that happens to replace print. It pushes a string onto the stack for each argument to the print function, then returns the number of items it added to the stack.

A dump stack shows the new items and the correct count.

But I then *thought* I would get those items on a stack after the lua state has processed the command. Apparently no, although a 'return 1' does pass something back on the stack.

Confusing to me. But I'm just starting my embedding adventures.

Bruce