Re: isnanl, printf, and non-IEEE values

[Eric Blake]

On 06/18/2012 07:27 PM, John Spencer wrote:

>> It's nice to be
>> able to print a floating point value retrieved from a file,
>> even if the file got messed up somehow,
> ack.

That argues that printf() should be robust to _everything_ you throw at
it, even bit patterns that are not produced by arithmetic.

>> and to have that
>> work reliably.  I'm willing to have my programs be
>> 0.00....01% slower if I can get that extra reliability.
>>
> maybe you, but not me.
> and i definitely don't want 2 different printf implementations in my
> binary because of this silly cornercase.

You don't need 2 different printf implementations, just one that
robustly handles all possible input.

> who uses LD80 values in files anyway ?

Who cares?  POSIX requires od to support it, and that should be enough
for libc to support it.

-- 
Eric Blake   address@hidden    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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