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X-HELO:	drew.franken.de
Date:	Tue, 14 Feb 2017 09:45:37 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: [ANNOUNCEMENT] Updated: dash-0.5.8-3
Message-ID:	<20170214084537.GD25846@calimero.vinschen.de>
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On Feb 13 23:03, Thomas Wolff wrote:
> Am 31.01.2017 um 16:32 schrieb Corinna Vinschen:
> > On Jan 31 16:01, Houder wrote:
> > > On Tue, 31 Jan 2017 14:16:16, Corinna Vinschen wrote:
> > > [snip]
> > > > Ok, here's what happens on Linux:  The termios code support a flag
> > > > IUTF8.  This flag determines if the termios code checks for UTF8
> > > > characters in the input when performing an ERASE.  It checks if the
> > > > IUTF8 flag is set and if so, it checks in a loop if the just erased=
 byte
> > > > is a UTF-8 continuation character.  If so, it erases another byte.
> > > Agreed. One byte or more, depending on the "character" ... (which is
> > > not a problem in case of UTF-8 encoding -- continuation bit).
> > >=20
> > > Of course, the terminal driver must receive the characters encoded in=
 UTF-8.
> > >=20
> > > ...
> > ... It's the termios implementation
> > inside Cygwin.  I created a patch introducing the IUTF8 flag as on Linux
> > as well as a code snippet trying to remove entire utf-8 characters from
> > the input if the IUTF8 flag is set.  And it's set now by default since
> > we default to UTF-8 anyway.
> >=20
> > Thomas, you may want to check for the IUTF8 flag in upcoming mintty
> > versions and unset it if character set configured in the mintty options
> > dialog is !=3D UTF-8.
> So the flag is always set initially? Also on Linux? Does it (on Linux) al=
so
> have an effect for non-UTF-8 multibyte encodings?

Yes, yes, and yes.

> And cannot the Cygwin DLL set the flag to match the locale setting when it
> was invoked?
>=20
> I can (and will if appropriate) handle the flag in mintty as needed, but
> what if someone calls LC_ALL=3D.other_encoding dash later within the term=
inal
> session? I guess the more consistent solution would be to handle this in =
the

No.  We're talking about a function in the master side of the tty, while
the applications started in the terminal are on the slave side.

iutf8 is set in Linux by default and by most terminal applications ionly
reset if the LC_CTYPE setting in the environment of the terminal
application is not set to the utf8 codeset.  This is determined at
terminal startup, not by the inferior processes runnin in the terminal.
The applications still can set iutf8 via termios control (or stty(1)).

For mintty I just thought it might be helpful to honor the character set
setting in its options and to default to iutf8 if it's not set.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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