DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:message-id:date:from:subject:to:references
	:content-type; q=dns; s=default; b=Y1JZtRt4YuBgxsvGwvkBoEY3q2cn5
	08y2JiGMF5VOUEavva1FXcBk86oVCSk9JmVhPd1c/aGNRwPM3fFI/RRZjbeYY92f
	DEICrnCEe5amWHkx7E2FqNT0GdZpYWoGyty4UEgpCo/mmJ4Ddx6GnhzfDcy0amxG
	MuHV9Q6Za/nwTE=
Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm
Sender: cygwin-owner@cygwin.com
Mail-Followup-To: cygwin@cygwin.com
Message-ID: <5b735658.1c69fb81.d015e.1895@mx.google.com>
Date: Tue, 14 Aug 2018 15:23:20 -0700 (PDT)
From: Steven Penny <svnpenn@gmail.com>
Subject: Re: strtod ("nan") returns negative NaN
To: cygwin@cygwin.com
References: <06e75f75-6a5f-2140-7557-849290225f79@redhat.com>
Content-Type: text/plain; charset=utf8; format=flowed
User-Agent: Tryst/2.8.0 (cup.github.io/tryst)

On Tue, 14 Aug 2018 16:44:59, Eric Blake wrote:
> The remaining question is whether it should turn "-NaN" into 
> -NaN; and the argument that glibc JUST fixed their bug 23007 to make 
> strtod("-nan") return -NaN means that Cygwin should, indeed, preserve 
> the negative sign bit when parsing "-nan".
>
> https://sourceware.org/bugzilla/show_bug.cgi?id=23007

respectfully, no, it doesnt mean that.

correct me, but Cygwin uses NewLib, not GlibC, so I would say the
"NewLib Committee" or its analog would have the say on what should happen in
this case.

Ive made my view clear already that "NaN" should never exist with a negative.
it would be equivalent to answering the question "what does blue smell like".
it just doesnt make sense.

and doing it just so that "strtod" matches "sscanf" seems like a solution going
the wrong way - we should be fixing "sscanf" to stop emitting a negative rather
than convincing "strtod" that it needs to start doing that.


--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple