Re: [perl #120426] Strange and unwarranted underflow in string-to-number

On 12/04/2013 10:22 AM, Dave Mitchell wrote:
> On Tue, Dec 03, 2013 at 01:21:53PM -0500, Morten Welinder wrote:
>> If I understand you right, you are rolling your own atof.
>
> Yep.
>
>> That is tricky business.
>
> Yep.
>
>> There are some tricky cases at
>>
>>      http://www.exploringbinary.com/incorrectly-rounded-conversions-in-gcc-and-glibc/
>>
>> that glibc has only recently gotten right.
>
> Thanks.
>
> Does anyone know why we roll our own?
>
There is a comment in sv.c

/* This is evil, but floating point is even more evil */

It may be because we found plenty of bugs in vendor libc's and thought 
we could do a better job.  Also is the issue of locales.  (That's why we 
shouldn't be using atoi()).

• [perl #120426] Strange and unwarranted underflow in string-to-number by perlbug-followup
• Re: [perl #120426] Strange and unwarranted underflow instring-to-number by Dave Mitchell
• Re: [perl #120426] Strange and unwarranted underflow instring-to-number by Zefram
• Re: [perl #120426] Strange and unwarranted underflow instring-to-number by Dave Mitchell
• Re: [perl #120426] Strange and unwarranted underflow instring-to-number by Dave Mitchell
• Re: [perl #120426] Strange and unwarranted underflow instring-to-number by Dave Mitchell
• Re: [perl #120426] Strange and unwarranted underflow in string-to-number by Morten Welinder
• Re: [perl #120426] Strange and unwarranted underflow in string-to-number by Morten Welinder
• Re: [perl #120426] Strange and unwarranted underflow instring-to-number by Dave Mitchell
• Re: [perl #120426] Strange and unwarranted underflow in string-to-number by Father Chrysostomos
• Re: [perl #120426] Strange and unwarranted underflow in string-to-number by sisyphus1
• Re: [perl #120426] Strange and unwarranted underflow in string-to-number by Karl Williamson