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Subject:	Re: strtod ("nan") returns negative NaN
To:	cygwin AT cygwin DOT com
References:	<20180814 DOT 134527 DOT 917341694729989717 DOT trueroad AT trueroad DOT jp> <20180814_dot_134527_dot_917341694729989717_dot_trueroad_at_trueroad_dot_jp> <20180814095618 DOT GT3747 AT calimero DOT vinschen DOT de> <20180815 DOT 000539 DOT 1012490218433540835 DOT trueroad AT trueroad DOT jp>
From:	Heavenly Avenger <avenger AT avenger DOT ws>
Message-ID:	<6074ccd0-84a3-5395-4902-33028de1d9a4@avenger.ws>
Date:	Tue, 14 Aug 2018 12:24:27 -0300
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Here's the result for a gentoo with the same code provided by Masamichi 
Hosoda.

Linux ethereal 4.14.32-std522-amd64 #2 SMP Sat Mar 31 20:05:28 UTC 2018 
x86_64 Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz GenuineIntel GNU/Linux

strtof ("nan", NULL) = nan
strtof ("-nan", NULL) = nan
strtod ("nan", NULL) = nan
strtod ("-nan", NULL) = nan
strtold ("nan", NULL) = nan
strtold ("-nan", NULL) = nan

This further supports the reasoning to always return just 'nan'.


On 8/14/2018 12:05 PM, Masamichi Hosoda wrote:
> Hi
>
> I've found that strtod ("nan") returns negative NaN on Cygwin 64 bit.
> https://cygwin.com/ml/cygwin/2018-08/msg00168.html
>
> On Linux with glibc, both strtod ("nan")
> and strtod ("-nan") return positive NaN.
>
> So I've created the patch that behaves like glibc.
> Both strtod ("nan") and strtod ("-nan") return positive NaN.
>
> Sample code:
> ```
> #include <stdio.h>
> #include <stdlib.h>
>
> int main (void)
> {
>    printf ("strtof (\"nan\", NULL) = %f\n", strtof ("nan", NULL));
>    printf ("strtof (\"-nan\", NULL) = %f\n", strtof ("-nan", NULL));
>    printf ("strtod (\"nan\", NULL) = %f\n", strtod ("nan", NULL));
>    printf ("strtod (\"-nan\", NULL) = %f\n", strtod ("-nan", NULL));
>    printf ("strtold (\"nan\", NULL) = %Lf\n", strtold ("nan", NULL));
>    printf ("strtold (\"-nan\", NULL) = %Lf\n", strtold ("-nan", NULL));
> }
> ```
>
> The result of Cygwin (newlib) without my patch:
> ```
> strtof ("nan", NULL) = nan
> strtof ("-nan", NULL) = nan
> strtod ("nan", NULL) = -nan
> strtod ("-nan", NULL) = nan
> strtold ("nan", NULL) = -nan
> strtold ("-nan", NULL) = -nan
> ```
>
> The result of Linux (glibc, Ubuntu 16.04):
> ```
> strtof ("nan", NULL) = nan
> strtof ("-nan", NULL) = nan
> strtod ("nan", NULL) = nan
> strtod ("-nan", NULL) = nan
> strtold ("nan", NULL) = nan
> strtold ("-nan", NULL) = nan
> ```
>
> The result of FreeBSD 10.1 (BSD libc):
> ```
> strtof ("nan", NULL) = nan
> strtof ("-nan", NULL) = nan
> strtod ("nan", NULL) = nan
> strtod ("-nan", NULL) = nan
> strtold ("nan", NULL) = nan
> strtold ("-nan", NULL) = nan
> ```
>
> The result of Cygwin (newlib) with my patch:
> ```
> strtof ("nan", NULL) = nan
> strtof ("-nan", NULL) = nan
> strtod ("nan", NULL) = nan
> strtod ("-nan", NULL) = nan
> strtold ("nan", NULL) = nan
> strtold ("-nan", NULL) = nan
> ```
>
> Thanks.
>
>
> --
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