text: #include <sys/socket.h>
  #include <netinet/in.h>
  #include <arpa/inet.h>
  
  in_addr_t inet_network(const char *p : itype(_Nt_array_ptr<const char>))
  {
  	return ntohl(inet_addr(p));
  }
  
  struct in_addr inet_makeaddr(in_addr_t n, in_addr_t h)
  {
  	if (n < 256) h |= n<<24;
  	else if (n < 65536) h |= n<<16;
  	else h |= n<<8;
  	return (struct in_addr){ h };
  }
  
  in_addr_t inet_lnaof(struct in_addr in)
  {
  	uint32_t h = in.s_addr;
  	if (h>>24 < 128) return h & 0xffffff;
  	if (h>>24 < 192) return h & 0xffff;
  	return h & 0xff;
  }
  
  in_addr_t inet_netof(struct in_addr in)
  {
  	uint32_t h = in.s_addr;
  	if (h>>24 < 128) return h >> 24;
  	if (h>>24 < 192) return h >> 16;
  	return h >> 8;
  }
  