RE: [External] : Passing buffers to function in elisp

[Drew Adams <drew.adams@oracle.com>]

> I'm reading some bytes into a temp buffer, like so:
> 
>   (with-temp-buffer
>     (set-buffer-multibyte nil)
>     (insert-file-contents-literally filename nil 0 64000))
> 
> then I pass these bytes to functions for processing, like this
> 
>     (func1 (buffer-string))
> 
> or sometimes just part of them
> 
>     (func2 (substring (buffer-string) 100 200))

Why aren't you passing the buffer itself to func1?
Why aren't you passing the buffer itself and the limits 100 and 200 to func2?

What is it that you're really trying to do?

Yes, if you start manipulating strings instead of buffer text you will pay a performance penalty, in general.