Re: isnanl, printf, and non-IEEE values

[Paul Eggert]

On 06/19/2012 05:51 AM, John Spencer wrote:
> #ifdef SYS_USES_LD80
> x = get_valid_ld80_or_zero(x);
> #endif
> 
> OSLT. why should i care ? go figure it out yourself.

As I understand it, it was your assertion that code like
GNU od's could be written portably, using standard C.
I was merely trying to check that assertion.  As the above
snippet does not appear to be portable standard C, we have not
been able to verify the assertion in question.

> you found one guy that wants to write floats into a file

Lots of people write floats into a file.  I've done it
myself.  That "one guy" was just one example.  If people
didn't need to read floats from files, 'od' wouldn't have
options to do exactly that.

>> I was talking about printf.
> not it that paragraph. 

My paragraph was talking about GNU od, which uses
snprintf to do the conversion.  Presumably snprintf uses
the same float-conversion machinery that printf does, so
if snprintf has undefined behavior on floats, then
GNU od will have undefined behavior as well, as will
any other program that reads floats from files and
prints them with printf or similar functions.

> seriously, with your attitude

On the contrary, we've all been remarkably polite,
considering the circumstances.  Are you accustomed
to winning arguments via vituperation?  Perhaps that
strategy works well in musl circles, but it's
counterproductive here.