From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: [ANNOUNCEMENT] Updated: dash-0.5.8-3
Date: Tue, 31 Jan 2017 10:04:00 -0000 [thread overview]
Message-ID: <20170131100402.GB29504@calimero.vinschen.de> (raw)
In-Reply-To: <81b5af354b7a3925ff0a68dcc063265f@smtp-cloud6.xs4all.net>
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On Jan 28 14:44, Houder wrote:
> On Wed, 25 Jan 2017 16:14:00, Steven Penny wrote:
> > Obviously Bash is not the problem, nor readline as Dash doesnt use readline. So
> > it appears the issue this time is again with cygwin1.dll, or perhaps the Dash
> > package.
>
> .. uhm, it appears to me that Windows is the issue here.
>
> As those in the know do not feel inclined to respond, I will provide some
> guesses that are my own:
>
> - in terms of input buffer management, utf-8 encoded characters will not
> be recognized in case of bash and dash ... (they are under Fedora)
> - see the output of stty -a: iutf8 is not present (it is under Fedora)
> - readline provides bash with input buffer management for utf-8 encoded
> characters on Windows (that is why it 'works' in case of bash)
> - bash has support for utf-8 encoded characters ...
> (e.g. ls -l ? will include one-character filenames in case the name is
> made up of only one multi-byte character)
> - dash has no such support ... [1][2]
>
> Consequently, dash is only partly useful, even more so on Windows (as it
> would require an additional "helper" on Windows in order to obtain proper
> line-editing). Helper? readline, libedit ...
>
> However, I am only guessing ... (only Erik and Corinna can provide expert
> details here).
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.
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.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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next prev parent reply other threads:[~2017-01-31 10:04 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-27 23:40 Eric Blake (cygwin)
2017-01-24 15:58 ` Houder
2017-01-25 1:28 ` Steven Penny
2017-01-25 13:37 ` Houder
2017-01-25 20:31 ` cyg Simple
2017-01-28 14:36 ` Houder
2017-01-26 0:14 ` Steven Penny
2017-01-28 13:44 ` Houder
2017-01-31 10:04 ` Corinna Vinschen [this message]
2017-01-31 13:16 ` Corinna Vinschen
2017-01-31 15:02 ` Houder
2017-01-31 15:33 ` Corinna Vinschen
2017-01-31 15:42 ` Eric Blake
2017-02-01 8:46 ` Houder
2017-01-31 17:54 ` Houder
2017-02-01 9:17 ` Corinna Vinschen
2017-02-13 22:03 ` Thomas Wolff
2017-02-14 8:45 ` Corinna Vinschen
2017-02-14 19:40 ` Thomas Wolff
2017-02-14 19:56 ` Eric Blake
2017-02-14 20:29 ` Thomas Wolff
2017-02-14 20:35 ` Thomas Wolff
2017-02-15 22:19 ` Thomas Wolff
2017-02-16 12:49 ` Corinna Vinschen
2017-02-16 20:32 ` Thomas Wolff
2017-02-17 7:36 ` Thomas Wolff
2017-02-17 9:43 ` Corinna Vinschen
2017-02-17 22:30 ` Thomas Wolff
2017-02-18 22:46 ` Thomas Wolff
2017-02-20 9:11 ` Corinna Vinschen
2017-02-20 21:08 ` Thomas Wolff
2017-02-20 9:07 ` Corinna Vinschen
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