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Subject: Re: [ANNOUNCEMENT] Updated: dash-0.5.8-3
To: cygwin AT cygwin DOT com
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From: Thomas Wolff <towo AT towo DOT net>
Message-ID: <58A6A7E0.8070500@towo.net>
Date: Fri, 17 Feb 2017 08:36:00 +0100
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Am 16.02.2017 um 21:32 schrieb Thomas Wolff:
> Am 16.02.2017 um 13:49 schrieb Corinna Vinschen:
>> On Feb 15 23:19, Thomas Wolff wrote:
>>> Am 14.02.2017 um 21:35 schrieb Thomas Wolff:
>>>> Am 14.02.2017 um 21:29 schrieb Thomas Wolff:
>>>>> Am 14.02.2017 um 20:56 schrieb Eric Blake:
>>>>>> On 02/14/2017 01:40 PM, Thomas Wolff wrote:
>>>>>>>> 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.
>>>>>>> I am not familiar with the concept of setting termios properties on
>>>>>>> either the master or slave side of a pty. I've only ever set
>>>>>>> them in the
>>>>>>> client application, including my tests about IUTF8 which worked.
>>>>>>> Would
>>>>>>> setting on the master side imply it's set for the clients
>>>>>>> implicitly,
>>>>>>> and can it be changed later, e.g. when mintty character encoding is
>>>>>>> being changed from the Options dialog?
>>>>>>> And you say the function of erasing characters on BS is in the
>>>>>>> master
>>>>>>> side? To be honest, this confuses me. I thought it's a
>>>>>>> client function,
>>>>>>> like readline() would perform if used (apparently not by
>>>>>>> dash), which is
>>>>>>> kind of an enhanced version of the tty cooked mode and used
>>>>>>> to work even
>>>>>>> without the new flag, right?
>>>>>> The readline source code does not mention IUTF8; and neither bash
>>>>>> nor
>>>>>> dash need to reference it, because if the tty handling code sets it
>>>>>> correctly for what the terminal is going to display, then the
>>>>>> clients
>>>>>> that are read()ing from the tty never even see BS in cooked mode
>>>>>> (the
>>>>>> master side of the terminal handles BS before the read()
>>>>>> completes in
>>>>>> the slave, if I'm understanding it correctly).
>>>>> This does not comply with my (limited) understanding of pty stuff.
>>>>> In mintty, forkpty will create a master/slave pty; mintty feeds it
>>>>> on the master side, while the client program (usually a shell) reads
>>>>> from the slave side. Mintty never handles BS for input, it simply
>>>>> feeds it into the pty. "Line disciplines" like cooked mode must be
>>>>> handled on the slave side.
>>>> Also, I've tried both options in mintty. Setting the flag on the
>>>> master
>>>> side has weird effects, initially blocking the terminal process.
>>>> Setting it on the slave side works fine.
>>> That was a mistake (got something wrong when testing). It works from
>>> either
>>> side alike.
>>> I've now patched mintty to keep the flag in sync with the character
>>> encoding, including on later changes (from Options menu or by escape
>>> sequence).
>> There's an ESC sequence to change the codeset?  Do you mean the
>> alternate codeset sequence \e[10m / \e[11m
> Oh, that one! Thanks for mentioning, I had overlooked it and fixed
> mintty now to consider it.
>> or is there something more sophisticated?
> I actually meant to adress
> https://github.com/mintty/mintty/wiki/CtrlSeqs#locale and there is
> also \e%G and \e%@.
>
> I just notice that later changing of the IUTF8 flag from the master
> side does not seem to work on a Window 10 system (although it works
> initially) while it does work on a Windows 7 system. Weird.
Now tested on 2 Windows 7 systems and 2 Windows 10 systems. Does not
work on Windows 10.
Any idea?
------
Thomas

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