#include <arpa/inet.h>
#define T(t) (t*)0;
#define C(n) switch(n){case n:;}
static void f()
{
T(in_port_t)
T(in_addr_t)
T(struct in_addr)
T(uint32_t)
T(uint16_t)

C(INET_ADDRSTRLEN)
C(INET6_ADDRSTRLEN)

#ifdef htonl
C(htonl(0))
#else
uint32_t(*p_htonl)(uint32_t) = htonl;
#endif
#ifdef htons
C(htons(0))
#else
uint16_t(*p_htons)(uint16_t) = htons;
#endif
#ifdef ntohl
C(ntohl(0))
#else
uint32_t(*p_ntohl)(uint32_t) = ntohl;
#endif
#ifdef ntohs
C(ntohs(0))
#else
uint16_t(*p_ntohs)(uint16_t) = ntohs;
#endif

in_addr_t(*p_inet_addr)(const char*) = inet_addr;
char*(*p_inet_ntoa)(struct in_addr) = inet_ntoa;
const char*(*p_inet_ntop)(int,const void*restrict,char*restrict,socklen_t) = inet_ntop;
int(*p_inet_pton)(int,const char*restrict,void*restrict) = inet_pton;
}