varargs...help appreciated

[Ken Lerman]

In article <27416 at mimsy.umd.edu> chris at mimsy.umd.edu (Chris Torek) writes:
...
[->> has lost attribution.]
->>p.s.  Anyone got any varargs macros, portable between
->>      traditional varargs and ANSI stdarg?
->
->If you mean what I think you mean, it cannot be done.  The reason
->is that `va_start' has the same name in <varargs.h> and <stdarg.h>
->but the former version (used above) has only one parameter while the
->latter has two.  It is thus impossible to write a single implementation.
->
->If you mean the other thing I think you mean, it can be done, but it
->looks horrible (and I will not even give an example).
->-- 
->In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 405 2750)
->Domain:	chris at cs.umd.edu	Path:	uunet!mimsy!chris

I generally put the following in my code (by #include):

#if defined(__STDC__) && __STDC__ != 0
#include <stdarg.h>
#define VA_START(ap,last) va_start(ap,last)
#else
#include <varargs.h>
#define VA_START(ap,last) va_start(ap)
#endif

Then I can write VA_START(ap, lastArg) in my code as if I'm using the
ANSI style of va_start.

While this is not a single va_start which does both, I think it meets
the portablility goals which were stated.

Ken