#define ROUNDUP_SIZEOF(x)   (((sizeof(x) + 3) / 4) * 4)

void print_char(char c)
{
  char s[2];

  s[0] = c;
  s[1] = '\0';

  print_string(s);
}

void myprintf(char *fmt, ...)
{
  char *p = ((char*)&fmt) + ROUNDUP_SIZEOF(fmt);

  while (*fmt){
    if (*fmt == '%'){
      fmt++;

      switch (*fmt){
      case 'd':
        print_int(*(int*)p);
        p = p + ROUNDUP_SIZEOF(int);
        break;
      case 's':
        print_string(*(char**)p);
        p = p + ROUNDUP_SIZEOF(char*);
        break;
      case 'c':
        print_char(*(char*)p);
        p = p + ROUNDUP_SIZEOF(char);
        break;
      }
    } else {
      print_char(*fmt);
    }
    fmt++;
  }
}

int main()
{
  myprintf("TEST %d is %c %s ...\n", 99, 'x', "OK");
  print_string("All done\n");
  return 0;
}