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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: How to copy current buffer to a temporary buffer
Date: Fri, 16 May 2014 13:13:50 +0300
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> From: "Pascal J. Bourguignon" <pjb@informatimago.com>
> Date: Fri, 16 May 2014 11:31:28 +0200
> 
> Cecil Westerhof <Cecil@decebal.nl> writes:
> 
> > I want to copy the current buffer to a temporary buffer, to do some
> > edits on it. (Converting a text file to a html file.)
> 
> 
> (let ((contents (buffer-substring (point-min) (point-max))))
>   (with-temp-buffer
>    (insert contents)
>    (do-something)))

I think using the insert-buffer function will make this more efficient
(since no string needs to be consed, something that might not be
trivial with large buffers).