Re: printf-safe checks of invalid long double values

[Pádraig Brady]

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.

Pádraig.