X-Spam-Check-By: sourceware.org
Date: Tue, 20 Jun 2006 19:18:35 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: newlib AT sourceware DOT org
Cc: cygwin AT cygwin DOT com
Subject: Re: strtod (and atof) on hex numbers
Message-ID: <20060620171835.GH29251@calimero.vinschen.de>
Reply-To: newlib AT sourceware DOT org
Mail-Followup-To: newlib AT sourceware DOT org, cygwin AT cygwin DOT com
References: <af54caaf0606201000o4df93c69scbc55bf24f12915d AT mail DOT gmail DOT com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <af54caaf0606201000o4df93c69scbc55bf24f12915d@mail.gmail.com>
User-Agent: Mutt/1.4.2i
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Precedence: bulk
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

This is a newlib issue.  I redirected this to the appropriate mailing
list newlib AT sourceware DOT org.


On Jun 20 13:00, Paul Biggar wrote:
> Hi,
> 
> atof (and hence strtod) on hexadecimal numbers results in 0.0 (errno
> of 0). This may be related to an old issue where NaN isnt correctly
> parsed. I believe it isnt correct behaviour:
> 
> http://www.opengroup.org/onlinepubs/000095399/functions/atof.html
> 
> 
> 
> I've tested it for integers in the range 0x8000000 to 0xFFFFFFFF. It
> works properly on
> 
> ubuntu dapper, gcc 4.1 on i386;
> debian stable, gcc 3.3 on amd64
> sunos ?, gcc 3.4 on sparc
> 
> I'm using standard cygwin distribution, which uses gcc 3.4.4 (cygming 
> special)
> 
> Sample code:
> 
> #include "limits.h"
> #include <iostream.h>
> #include "errno.h"
> 
> int main()
> 
> {
>        cout << ULONG_MAX << endl;
>        cout << 0xFFFFFFFF << endl;
> 
>        errno = 0;
>        cout << atof("0xFFFFFFFF") << endl;
>        cout << errno << endl;
> 
>        errno = 0;
>        cout << strtod("0xFFFFFFFF", NULL) << endl;
>        cout << errno << endl;
> 
> }
> 
> 
> Is this being fixed? I could find a mention of it before. Does anyone
> know a simple workaround?
> 
> Thanks
> Paul

Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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