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Re: how to calculate the size of string in bytes?


From: tomas
Subject: Re: how to calculate the size of string in bytes?
Date: Tue, 18 Aug 2015 21:30:49 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

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On Tue, Aug 18, 2015 at 07:35:03PM +0300, Eli Zaretskii wrote:
> > Date: Tue, 18 Aug 2015 18:01:45 +0200
> > Cc: address@hidden
> > From:  <address@hidden>
> > 
> > I was thinking of "characters not expressible in UTF-8". Does Emacs have
> > those?
> 
> Raw bytes come out as themselves (which might be invalid UTF-8), but
> that's not a failure, that's the user's fault, because they had those
> bytes in the buffer to begin with.

I was having difficulties in understanding you, so I tried it out. Now
I understand: Emacs's internal (raw) coding system can represent "characters
not expressible in utf-8". The function encode-coding-string passes those
bytes silently through, outputting an invalid utf-8 sequence.

So I venture the guess that when the Emacs buffer contains something
epressible as valid utf-8, 'utf-8 and 'raw are equivalent (what about
combining characters?)

Thanks for the insights
- -- t
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