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Date: Tue, 27 Feb 2018 12:48:07 +0300
From: Andrey Repin <anrdaemon AT yandex DOT ru>
Reply-To: cygwin AT cygwin DOT com
Message-ID: <1354080997.20180227124807@yandex.ru>
To: Orgad Shaneh <orgads AT gmail DOT com>, cygwin AT cygwin DOT com
Subject: Re: gawk Regression: CR characters are not stripped on Windows
In-Reply-To: <CAGHpTB+bfbts=fOBSQPN7c-NDh8FTXR+EauhDhiVrqbgawcYoA@mail.gmail.com>
References: <CAGHpTB+bfbts=fOBSQPN7c-NDh8FTXR+EauhDhiVrqbgawcYoA AT mail DOT gmail DOT com>
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Greetings, Orgad Shaneh!

> 1. The gawk info page states that:

>> Under MS-Windows,
------------^^^^^^^
>> 'gawk' (and many other text programs) silently
>> translates end-of-line '\r\n' to '\n' on input and '\n' to '\r\n' on
>> output.

> and on Feb 8 the following section was added:

>> Recent versions of Cygwin open all files in binary mode.  This means
>> that you should use 'RS = "\r?\n"' in order to be able to handle
>> standard MS-Windows text files with carriage-return plus line-feed line
>> endings.

> This breaks compatibility between different gawk versions. What were
> the reasons for this change in cygwin, and why was it pushed upstream?

> 2. Git and other tools automatically convert text files to CRLF on
> Windows.
--^^^^^^^

Cygwin is not "Windows", it is "sort of Linux".
Besides, this kind silent mangling is dangerous to an unsuspecting user.

> This means that any awk script that runs on both platforms
> must use RS = "\r?\n". One example that was broken by this behavior
> change is gerrit's commit-msg hook[1], which scans for empty lines by
> /^$/ regexp.


-- 
With best regards,
Andrey Repin
Tuesday, February 27, 2018 12:44:21

Sorry for my terrible english...


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