Re: String buffers

[Klaus Ripke <paul-lua@...>]

On Sat, Feb 04, 2006 at 07:47:19PM +0200, Asko Kauppi wrote:
> No, I think not (without patching the Lua C/API, that is).
> 
> David Given kirjoitti 2.2.2006 kello 19.44:
> 
> >I'm trying to wrap a particular API function that writes a string  
> >into a
> >buffer.
...
> >I'd like to avoid the temporary buffer. Is there any way of  
> >persuading Lua to
> >allocate an *uninitialised* string of a particular length on the  
> >stack, and
> >then giving me a pointer to it so I can fill in that data one's the  
> >string's
> >been allocated?
Yet there is a standard workaround.

For short strings, which are 99% in most applications,
the overhead of the additional malloc by far outweights the 
extra copy.

So you should see substantial speedup by providing a fixed local
buffer of 1K or so a/o using alloca, depending on platform.


best