From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 16704 invoked by alias); 14 Aug 2018 15:35:34 -0000 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Received: (qmail 16663 invoked by uid 89); 14 Aug 2018 15:35:33 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-101.2 required=5.0 tests=AWL,BAYES_00,GOOD_FROM_CORINNA_CYGWIN,KAM_LAZY_DOMAIN_SECURITY,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.2 spammy= X-HELO: mout.kundenserver.de Received: from mout.kundenserver.de (HELO mout.kundenserver.de) (212.227.17.13) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Tue, 14 Aug 2018 15:35:31 +0000 Received: from calimero.vinschen.de ([24.134.7.25]) by mrelayeu.kundenserver.de (mreue102 [212.227.15.183]) with ESMTPSA (Nemesis) id 0MfYYl-1fVRud42pP-00P4jC for ; Tue, 14 Aug 2018 17:35:29 +0200 Received: by calimero.vinschen.de (Postfix, from userid 500) id 16F04A80613; Tue, 14 Aug 2018 17:35:28 +0200 (CEST) Date: Tue, 14 Aug 2018 15:54:00 -0000 From: Corinna Vinschen To: cygwin@cygwin.com Subject: Re: strtod ("nan") returns negative NaN Message-ID: <20180814153528.GY3747@calimero.vinschen.de> Reply-To: cygwin@cygwin.com Mail-Followup-To: cygwin@cygwin.com References: <20180814095618.GT3747@calimero.vinschen.de> <20180814095618_dot_GT3747_at_calimero_dot_vinschen_dot_de> <20180814103900.GU3747@calimero.vinschen.de> <20180814.211757.2066454831159853501.trueroad@trueroad.jp> <20180814132301.GX3747@calimero.vinschen.de> <1e04c237-70f8-5cc9-7dae-d00e3bfea39d@avenger.ws> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="Sx3M3By4KbPIrykT" Content-Disposition: inline In-Reply-To: <1e04c237-70f8-5cc9-7dae-d00e3bfea39d@avenger.ws> User-Agent: Mutt/1.9.2 (2017-12-15) X-SW-Source: 2018-08/txt/msg00182.txt.bz2 --Sx3M3By4KbPIrykT Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-length: 1228 On Aug 14 12:20, Heavenly Avenger wrote: > On 8/14/2018 10:23 AM, Corinna Vinschen wrote: > > I just wonder why returning -NaN when the input is "-nan" isn't the > > better approach. After all: > >=20 > > printf ("nan (\"\") =3D %f\n", nan ("")); > > printf ("-nan (\"\") =3D %f\n", -nan ("")); > >=20 > > =3D=3D> > >=20 > > nan ("") =3D nan > > -nan ("") =3D -nan > >=20 > > So, shouldn't the ideal outcome be this: > >=20 > > strtod ("nan", NULL) =3D nan > > strtod ("-nan", NULL) =3D -nan > > strtold ("nan", NULL) =3D nan > > strtold ("-nan", NULL) =3D -nan > >=20 > > ? > >=20 > > Corinna > >=20 > I'd say it is not the better/best approach as, even though it makes sense, > all other implementations or linux distributions treat it as a plain "nan= ". > So anything written for linux will potentially break on cygwin, I am not > sure this is the idea behind cygwin, right? My point is, even the glibc printf prints a negative NaN as "-nan", see above. strtod/strtold returning a different NaN value looks inconsistent. Well, never mind. Corinna --=20 Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat --Sx3M3By4KbPIrykT Content-Type: application/pgp-signature; name="signature.asc" Content-length: 833 -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEoVYPmneWZnwT6kwF9TYGna5ET6AFAlty9r8ACgkQ9TYGna5E T6AbYRAAgmKUy8IJ2zH8EImkYrvdabx/25FDUtXAH0dVTBHLUShs6bCpXWLLADKv OYGZjfTgjdwyEKNsimooqpAzURnDvn0vYuGmaJH1T05+xcxr53G/fI1PUWTjZEn7 Qzh/MKTmFlqKWbzWyVmviLot2IcudxRbWxu/wnvKsMfIKoY6OLLUPmfRKFAPBW4n cx8cKtYnLGj6d3WyCJQ7dUc0vZ7ZnQNl8aHZMkQLBcB2Z0+hVKWdqkKK/BFVuRl1 hlFHqAGT41gRDSMbf5L/HEz9K759RgBqNDoUQ4xM/hddbzqUWgTqzLw8Ye5gBGWf Pfyhs2qF2SrCUSaTvfd7iPZ1CkZd9tPX8O2aztv8/JKGUf9Vxue67SlUGn5d978A 06eojztVwErON85Z0AcEUljWKoWWW4p4JngvCWUHryEs/D8J7swVAsrFIK9eZccr kYJPJHnE0ucbBBhPxYS2s+EPtLdmbluK3ykNfiDlqLc132Fz1t6Urvkbmi8OTdNa VxvKjftmOhOp5IU9M0LrHrIV/FXuAitjzVhrrIMVx9TbMFw1hWQzpn6v8Pda2o7Z w0ysEkbSqBeXHjjAkvhcQektZc37ncsGvG/mHVaJ7OlwdenU70Z9F/vFv59gCJG6 yaNlLmpmP900coEacQ06JUuUR743c9PD9eVZLWJa6HacMAYBWE0= =/Idc -----END PGP SIGNATURE----- --Sx3M3By4KbPIrykT--