From: Eli Zaretskii <eliz@gnu.org>
To: help-gnu-emacs@gnu.org
Subject: Re: how to calculate the size of string in bytes?
Date: Tue, 18 Aug 2015 22:49:58 +0300 [thread overview]
Message-ID: <831tf0l6l5.fsf@gnu.org> (raw)
In-Reply-To: <20150818193049.GA24519@tuxteam.de>
> Date: Tue, 18 Aug 2015 21:30:49 +0200
> Cc: help-gnu-emacs@gnu.org
> From: <tomas@tuxteam.de>
>
> I was having difficulties in understanding you
Sorry about that. It's a complex issue to explain in a few words.
> Now I understand: Emacs's internal (raw) coding system can represent
> "characters not expressible in utf-8".
More accurately, it can represent characters outside the Unicode code
space.
And please don't call that "raw"; the internal representation of
characters used by Emacs is known as 'utf-8-emacs'.
> The function encode-coding-string passes those bytes silently
> through, outputting an invalid utf-8 sequence.
Yes. Although in interactive functions Emacs will normally complain
and ask for a better encoding.
> So I venture the guess that when the Emacs buffer contains something
> epressible as valid utf-8, 'utf-8 and 'raw are equivalent
Yes.
> (what about combining characters?)
Emacs doesn't normalize/compose/decompose characters when it encodes
text (with a notable exception of the utf-8-hfs encoding).
Applications that want this should do that themselves, e.g. using the
facilities in ucs-normalize.el.
next prev parent reply other threads:[~2015-08-18 19:49 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-18 9:11 how to calculate the size of string in bytes? Sam Halliday
2015-08-18 10:13 ` tomas
2015-08-18 14:37 ` Eli Zaretskii
2015-08-18 14:45 ` tomas
2015-08-18 15:00 ` Eli Zaretskii
2015-08-18 16:01 ` tomas
2015-08-18 16:35 ` Eli Zaretskii
2015-08-18 19:30 ` tomas
2015-08-18 19:49 ` Eli Zaretskii [this message]
2015-08-18 20:11 ` tomas
2015-08-18 21:47 ` Stefan Monnier
2015-08-19 5:43 ` tomas
[not found] ` <mailman.8577.1439934462.904.help-gnu-emacs@gnu.org>
2015-08-19 8:57 ` Sam Halliday
2015-08-19 9:22 ` Sam Halliday
2015-08-19 19:47 ` Stefan Monnier
[not found] ` <mailman.8504.1439892841.904.help-gnu-emacs@gnu.org>
2015-08-18 10:43 ` Sam Halliday
2015-08-18 11:47 ` tomas
[not found] ` <mailman.8510.1439898432.904.help-gnu-emacs@gnu.org>
2015-08-18 12:06 ` Sam Halliday
2015-08-18 14:34 ` Eli Zaretskii
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=831tf0l6l5.fsf@gnu.org \
--to=eliz@gnu.org \
--cc=help-gnu-emacs@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.