Function intpr

tools/netstat/if.c:271–501

* Print a description of the network interfaces. */

 * Print a description of the network interfaces.
 */
void
intpr(void (*pfunc)(char *), int af)
{
	struct ifaddrs *ifap, *ifa;
	struct ifmaddrs *ifmap, *ifma;
	u_int ifn_len_max = 5, ifn_len;
	u_int has_ipv6 = 0, net_len = 13, addr_len = 17;

	if (interval)
		return sidewaysintpr();

	if (getifaddrs(&ifap) != 0)
		err(EX_OSERR, "getifaddrs");
	if (aflag && getifmaddrs(&ifmap) != 0)
		err(EX_OSERR, "getifmaddrs");

	if (Wflag) {
		for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
			if (interface != NULL &&
			    strcmp(ifa->ifa_name, interface) != 0)
				continue;
			if (af != AF_UNSPEC && ifa->ifa_addr->sa_family != af)
				continue;
			ifn_len = strlen(ifa->ifa_name);
			if ((ifa->ifa_flags & IFF_UP) == 0)
				++ifn_len;
			ifn_len_max = MAX(ifn_len_max, ifn_len);
			if (ifa->ifa_addr->sa_family == AF_INET6)
				has_ipv6 = 1;
		}
		if (has_ipv6) {
			net_len = 24;
			addr_len = 39;
		} else
			net_len = 18;
	}

	xo_open_list("interface");
	if (!pfunc) {
		xo_emit("{T:/%-*.*s}", ifn_len_max, ifn_len_max, "Name");
		xo_emit(" {T:/%5.5s} {T:/%-*.*s} {T:/%-*.*s} {T:/%8.8s} "
		    "{T:/%5.5s} {T:/%5.5s}",
		    "Mtu", net_len, net_len, "Network", addr_len, addr_len,
		    "Address", "Ipkts", "Ierrs", "Idrop");
		if (bflag)
			xo_emit(" {T:/%10.10s}","Ibytes");
		xo_emit(" {T:/%8.8s} {T:/%5.5s}", "Opkts", "Oerrs");
		if (bflag)
			xo_emit(" {T:/%10.10s}","Obytes");
		xo_emit(" {T:/%5s}", "Coll");
		if (dflag)
			xo_emit(" {T:/%5.5s}", "Drop");
		xo_emit("\n");
	}

	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
		bool network = false, link = false;
		char *name, *xname, buf[IFNAMSIZ+1];