C99 variadic macros

[John Baldwin]

On Thursday 05 February 2004 03:04 pm, Stefan Farfeleder wrote:
> On Thu, Feb 05, 2004 at 02:05:59PM -0500, John Baldwin wrote:
> > On Thursday 05 February 2004 11:46 am, Stefan Farfeleder wrote:
> > > #define foo(fmt, args...)	printf("%s: " fmt "\n", __func__, ##args)
> >
> > C99 macros don't work when args is 0.  I.e., if I did:
> >
> > 	foo("test");
> >
> > The C99 _VA_ARGS_ think doesn't delete the , whereas the GCC way does.
>
> While it's true that the ellipsis must match a positive number of
> arguments, this isn't necessarily a problem.  You just use "..." for
> both the format string and its arguments.

Not always easily done in my experience, though the 3 printf thing (ugh) might 
serve as a workaround as I didn't try that before when I've tried to use the 
C99 way.

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org