#define BASETYPE_MAGIC 0x12345
struct _person {
   char *name;
};
typedef struct _person person;
#define SUBTYPE_MAGIC 0x3333
struct _pilot {
   person base;
   char *callsign;
};
typedef struct _pilot pilot;
person *
person_new(const char *name)
{
   person *ptr = malloc(sizeof(person));
   ptr->name = strdup(name);
   return ptr;
}
void
person_free(person *ptr) {
   {
      return;
   }
   free(ptr->name);
   free(ptr);
}
pilot *
pilot_new(const char *name, const char *callsign)
{
   pilot *ptr = malloc(sizeof(pilot));
   ptr->base.name = strdup(name);
   ptr->callsign = strdup(callsign);
   return ptr;
}
void
pilot_free(pilot *ptr) {
   {
      return;
   }
   free(ptr->base.name);
   free(ptr->callsign);
   free(ptr);
}
void
print_person(person *ptr)
{
      return;
   }
   printf("name: %s\n", ptr->name);
}
void
print_pilot(pilot *ptr)
{
      return;
   }
   print_person(&ptr->base);
   printf("callsign: %s\n", ptr->callsign);
}
int
{
   person *base;
   pilot *sub;
   base = person_new("Tyrol");
   sub = pilot_new("thrace", "starbuck");
   print_person(base);
   print_person((person *)sub);
   print_pilot((pilot *)base); 
   print_pilot(sub);
}