// Compile as C code, not C++
#include <stdio.h>
#include <stdarg.h>

int __cdecl fxn(const char* format, ...)
{
  int r;
  void* p = NULL;
  va_list vl;
  va_start(vl, format);
  r = vprintf(format, vl);
  va_end(vl);
  __asm
  {
    mov p, esp
  }
  printf("ESP = %X\n", p);
  return r;
}

int (__stdcall * pfxn)() = (int(__stdcall*)())&fxn;

int main(void)
{
  fxn("Hello world %d!\n", 1);
  fxn("Hello world %d!\n", 2);
  fxn("Hello world %d!\n", 3);
  pfxn("Hello world %d!\n", 4);
  pfxn("Hello world %d!\n", 5);
  pfxn("Hello world %d!\n", 6);
/*
  Sample output:
  Hello world 1!
  ESP = CFE14
  Hello world 2!
  ESP = CFE14
  Hello world 3!
  ESP = CFE14
  Hello world 4!
  ESP = CFE14
  Hello world 5!
  ESP = CFE0C
  Hello world 6!
  ESP = CFE04
*/
  return 0;
}