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Date: Tue, 27 Jun 2006 11:28:20 -0600 (MDT)
From: David Mastronarde <mast AT colorado DOT edu>
To: Dave <kilroyd AT googlemail DOT com>
cc: cygwin AT cygwin DOT com
Subject: Re: sed 4.1.5 adds extra CR with input file path in Windows format
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On Sun, 25 Jun 2006, Dave wrote:

> David Mastronarde wrote:
>> After upgrading sed from 4.1.4 to 4.1.5, I found that line endings were
>> being converted from CRLF to CRCRLF when the input file was specified
>> with a windows file path:
>> 
>> % sed -e 's/g5a/setname/g' < 'c:\cygwin\home\mast/sedtestin' > ! sedtestout
>> 
>> Converting the path to cygwin format eliminated the problem.
>> 
>
>> C:\cygwin                          /                         system 
>> textmode
>> C:\cygwin/bin                      /usr/bin                  system 
>> textmode
>> C:\cygwin/lib                      /usr/lib                  system 
>> textmode
>> C:\cygwin\usr\X11R6\lib\X11\fonts  /usr/X11R6/lib/X11/fonts  system 
>> binmode
>> .                                  /cygdrive                 system 
>> textmode,cygdrive
>
> Have a read of http://cygwin.com/cygwin-ug-net/using-textbinary.html
>
> Stepping through it:
> % sed -e 's/g5a/setname/g' < 'c:\cygwin\home\mast/sedtestin' > ! sedtestout
>
> rule b. sedtestin input will be read in binary mode. i.e it reads \r\n
>
> redirection of input is done in binmode from rule c.
> ditto output redirection.
>
> writing of the file is done in textmode due to your mounts (rule a). Hence 
> \r\n coming out of sed becomes \r\r\n.
>
> Try specifying the output file in MSDOS format, '.\sedtestout'.
>

Thanks for bringing the rules (back) to my attention.  Yes, it seems that 
the heart of the problem is that a file specified by a windows path is 
read in binary while the writing is to a textmode-mounted partition.  I 
never made the connection between the initial choice of line endings when 
running Cygwin setup and the mounting mode of the partitions.

I don't see the distinction between the redirection and the writing, and 
also setting CYGWIN to nobinmode has no effect, so rule c does not seem to 
be relevant.

But also, specifying output as '.\sedtestout' did NOT solve the problem, 
even with nobinmode in effect.  So rule b is governing the input but is 
not being applied on output.

David

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