inet6name
struct ctlname inet6name[] = CTL_IPV6PROTO_NAMES;
struct list inet6list = { inet6name, IPV6PROTO_MAXID };
char *inet6name(struct in6_addr *);
char *inet6name(struct in6_addr *);
if (vflag && width < strlen(inet6name(in6)))
width = strlen(inet6name(in6));
snprintf(line, len, "%.*s.", width, inet6name(in6));
tbprintf("%s", inet6name(in6));
tbprintf("%s", inet6name(&addr->v6));
const char *inet6name(struct in6_addr *);