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Re: printf-safe checks of invalid long double values

From: Pádraig Brady
Subject: Re: printf-safe checks of invalid long double values
Date: Fri, 28 Nov 2014 16:59:01 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0

On 28/11/14 15:57, Paul Eggert wrote:
> Pádraig Brady wrote:
>> 1. Include the snprintf-posix gnulib module to fix this od issue,
>> (but that would also use the replacement code in many more cases).
>> 2. Adjust gnulib's ftoastr() to use the lower level vasnprintf-posix.
>> That would work, though vasnprintf is not provided by glibc at all,
>> so perhaps a lower level glibc equivalent function is preferred.
>> 3. Since glibc no longer crashes, and no-one has complained about
>> these edge cases of invalid numbers, just avoid this replacement altogether
>> but push for the improvement to output "nan" in these cases in glibc.
> Thanks, I like this option [3] the best.

BTW Looking a bit more into option 1, I see that snprintf isn't used
that much at all, though it is used in numfmt with %Lf and so we'd
need for other portability reasons to avoid that or use snprintf-posix
for that too.  I'll look into avoiding that in numfmt.


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