plurales
printf(m, tcpstat[f], plurales(tcpstat[f]))
printf(m, udpstat[f], plurales(udpstat[f]))
printf(m, tcp6stat.f, plurales(tcp6stat.f))
#define pes(f, m) printf(m, (unsigned long long)mrtstat.f, plurales(mrtstat.f))
const char *plurales(unsigned long long);