#defines with variable # arguments

[Lawrence V. Cipriani]

In article <2855 at phoenix.Princeton.EDU>, lgy at pupthy2.PRINCETON.EDU (Larry Yaffe) writes:
> 
>     Are there any versions of cpp which allow one to define macros which
> accept variable numbers of arguments?  I keep wishing for this every time
> I try to move code developed using sysV sprintf to a BSD system, so that
> I could do something like:
>	examples deleted

This question comes up now and then.  No version of cpp I know has a
variable count capability, but those are only AT&T cpp's.  You can
work around it though, so this is portable.  Define a macro like this:

#define SPRINTF(args)	sprintf args

and use it like this:

	SPRINTF((str, format, a1, a2, ..., an));

The double parens trick cpp into seeing only one argument.  After
cpp expansion you get:

	sprintf (str, format, a1, a2, ..., an);
-- 
Larry Cipriani, AT&T Network Systems and Ohio State University
Domain: lvc at tut.cis.ohio-state.edu
Path: ...!cbosgd!osu-cis!tut.cis.ohio-state.edu!lvc (weird but right)