[PATCH] tst-scanf-format-real: don't crash on nan()

[Maciej W. Rozycki]

On Thu, 10 Apr 2025, Carlos O'Donell wrote:

> > > May you please post a v2 that accounts for this correctly to avoid this
> > > becoming a problem in the future?
> > 
> > It cannot.
> > 
> 
> I understand that position. Particularly since the existing code suffers
> no ill effects.
> 
> Will you be posting a v2 with the requested changes?

 Can we please hold on with this yet?  This is a fix for an unhandled data 
input format, which doesn't affect any actual input present in our tests.  
As such, there's no need to rush with an update here; input data formats 
supported here are a subset of what ISO C has defined (although I agree 
code mustn't crash on rubbish input but instead handle it gracefully).

 My understanding of the issue has been that on M68K "nan" and "nan()" 
produce different results as inputs to `strtod', etc.  I've got a fix in 
the queue and for that we'll need a corresponding update to handle "nan" 
and "nan()" reference input accordingly in the tests.  Naturally that'll 
require both to be handled correctly.

  Maciej