Recursive Calls with Ellipses

[Erik Zawadzki]

I'm trying to write a wrapper functions for a function that uses the
stdarg.h ellipses notation for variable arguments. In essense, if the
original function is:

void foo(int n, ...){
//body
}

I want to write a function like:

void foo_wrapper (int n, ...){
//some stuff
foo(n, ##SOMETHING##);
//some other stuff
}

Where the ##SOMETHING## is exactly what satisfied the "...".
How do I do this? I tried naively giving "foo" a va_list, but that lead
to some fun segmentation errors. Any other thoughts?

 

[Victor Bazarov]

I'm trying to write a wrapper functions for a function that uses the
stdarg.h ellipses notation for variable arguments. In essense, if the
original function is:

void foo(int n, ...){
//body
}

I want to write a function like:

void foo_wrapper (int n, ...){
//some stuff
foo(n, ##SOMETHING##);
//some other stuff
}

Where the ##SOMETHING## is exactly what satisfied the "...".
How do I do this? I tried naively giving "foo" a va_list, but that lead
to some fun segmentation errors. Any other thoughts?

There is no way. Create a common function that will accept the va_list,
and call it from both 'foo' and 'foo_wrapper'.

V