From: Daniel Berger <djberg96@...>
Date: 2007-03-19T00:10:05+09:00
Subject: Problem trying to use varargs in private function within C extension

Hi all,

Ruby 1.8.6
Windows XP
VC++ 8

This simple C extension complains of "too few arguments for call" when
I try to build it. Yet, within a standalone C program it works fine.
Am I forced to use varargs.h instead of stdarg.h? If so, how do I make
this work? The varargs.h docs confuse me.

#include <ruby.h>
#include <stdarg.h>

int test(const char*, ...);

/* String mandatory, encoding optional */
int test(const char* str, int encoding, ...){
   int total = 0;
   total = encoding;

   printf("X: %s\n", str);
   printf("Encoding: %i\n", encoding);

   return total;
}

static VALUE foo_test(VALUE self){
   int total = 0;

   total = test("hello"); /* Failure! */
   printf("TOTAL: %i\n");
   return self;
}

void Init_foo(){
   VALUE cFoo = rb_define_class("Foo", rb_cObject);
   rb_define_method(cFoo, "test", foo_test, 0);
}

And here's the standalone C code that builds and runs fine:

#include <windows.h>
#include <stdio.h>
#include <stdarg.h>

int test(const char*, ...);

int main(){
   int val = 0;

   val = test("hello", 3);
   printf("VAL: %i\n", val);

   return 0;
}

int test(const char* x, int encoding, ...){
   int total = 0;
   total = encoding;

   printf("Encoding: %i\n", encoding);

   return total;
}

Thanks,

Dan