next_addr(f)
unsigned char *next_addr(f)
next_addr(f)unsigned char *f;{	unsigned char *a;/* If no digis, return the destination address */	if(NO_DIGIS(f))return f;/* check each digi field.  The first one that hasn't seen it is the one */	a = f + 7;	do {		a += 7;		if(NOTREPEATED(a))return a;	}while(NOT_LAST(a));/* all the digis have seen it.  return the destination address */	return f;       }