#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)(uint32_t) = htonl;}

#endif

#ifdef htons

C(htons(0))

#else

{uint16_t(*p)(uint16_t) = htons;}

#endif

#ifdef ntohl

C(ntohl(0))

#else

{uint32_t(*p)(uint32_t) = ntohl;}

#endif

#ifdef ntohs

C(ntohs(0))

#else

{uint16_t(*p)(uint16_t) = ntohs;}

#endif

{in_addr_t(*p)(const char*) = inet_addr;}

{char*(*p)(struct in_addr) = inet_ntoa;}

{const char*(*p)(int,const void*restrict,char*restrict,socklen_t) = inet_ntop;}

{int(*p)(int,const char*restrict,void*restrict) = inet_pton;}

}