Why is a file specified in DOS format opened in binary mode?

[Dave]

(was Re: sed 4.1.5 adds extra CR with input file path in Windows format)

David Mastronarde wrote:
> On Tue, 27 Jun 2006, Dave Kilroy wrote:
>> On 6/27/06, David Mastronarde wrote:
>>> 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:
>>>> Have a read of http://cygwin.com/cygwin-ug-net/using-textbinary.html
>>>>
>>>> Try specifying the output file in MSDOS format, '.\sedtestout'.
>
> So it all makes sense in terms of it following the rules.  But I am 
> curious as to the reason for rule b.  Most things in Cygwin seem to deal 
> interchangeably with windows and cygwin paths.

Sorry, can't help you there - this behaviour has been present longer 
than I have monitorred this list. A google didn't bring much 
enlightenment either.

Anyone else?

Dave.

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