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Date: Tue, 31 Jan 2017 16:01:55 +0100
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From: Houder <houder AT xs4all DOT nl>
To: cygwin AT cygwin DOT com
Subject: Re: [ANNOUNCEMENT] Updated: dash-0.5.8-3
References: <d58b09904f6fc607e5c044e67a02f393 AT smtp-cloud3 DOT xs4all DOT net> <58893f48 DOT 0850ca0a DOT 6c5d DOT 5fde AT mx DOT google DOT com> <81b5af354b7a3925ff0a68dcc063265f AT smtp-cloud6 DOT xs4all DOT net> <20170131100402 DOT GB29504 AT calimero DOT vinschen DOT de> <20170131131616 DOT GC29504 AT calimero DOT vinschen DOT de>
In-Reply-to: <20170131131616.GC29504@calimero.vinschen.de>
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On Tue, 31 Jan 2017 14:16:16, Corinna Vinschen wrote:

[snip]

> > I'm not quite sure yet but apparently the problem is in the handling of
> > VERASE in the termios implementation.  In cooked mode it fills a char
> > buffer with what has been typed.  The code doesn't know if the bytes in
> > the buffer are UTF-8 chars or just random bytes.  So VERASE erases
> > exactly one byte, which means, in case of UTF-8 chars it only erases the
> > last byte of of a mulitbyte character.
> >=20
> > It seems the Linux termios implementation is different in that it
> > still knows which bytes constitute a single keypress and thus knows
> > how much byte it has to erase.
> 
> 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.

(Thank you for responding -- and your effort thus far).

Agreed. One byte or more, depending on the "character" ... (which is
not a problem in case of UTF-8 encoding -- continuation bit).

Of course, the terminal driver must receive the characters encoded in
UTF-8.

Therefore the question is: 'can the same situation be created under
under Windows?' (does Windows provide the required support?)

A second question is: 'is it worth the effort?' Given that bash can
recognize UTF-8 (using readline) ...

.. and the fact that dash does not support multi-byte characters.

Regards,

Henri

=====


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