inline int gai_serv()

in demo_example/asio/asio/detail/impl/socket_ops.ipp [3214:3291]

• 69 lines of code
• 17 McCabe index (conditional complexity)

inline int gai_serv(addrinfo_type* aihead,
    const addrinfo_type* hints, const char* serv)
{
  using namespace std;

  int num_found = 0;

  if (
#if defined(AI_NUMERICSERV)
      (hints->ai_flags & AI_NUMERICSERV) ||
#endif
      isdigit(static_cast<unsigned char>(serv[0])))
  {
    int port = htons(atoi(serv));
    if (hints->ai_socktype)
    {
      // Caller specifies socket type.
      int rc = gai_port(aihead, port, hints->ai_socktype);
      if (rc < 0)
        return EAI_MEMORY;
      num_found += rc;
    }
    else
    {
      // Caller does not specify socket type.
      int rc = gai_port(aihead, port, SOCK_STREAM);
      if (rc < 0)
        return EAI_MEMORY;
      num_found += rc;
      rc = gai_port(aihead, port, SOCK_DGRAM);
      if (rc < 0)
        return EAI_MEMORY;
      num_found += rc;
    }
  }
  else
  {
    // Try service name with TCP first, then UDP.
    if (hints->ai_socktype == 0 || hints->ai_socktype == SOCK_STREAM)
    {
      servent* sptr = getservbyname(serv, "tcp");
      if (sptr != 0)
      {
        int rc = gai_port(aihead, sptr->s_port, SOCK_STREAM);
        if (rc < 0)
          return EAI_MEMORY;
        num_found += rc;
      }
    }
    if (hints->ai_socktype == 0 || hints->ai_socktype == SOCK_DGRAM)
    {
      servent* sptr = getservbyname(serv, "udp");
      if (sptr != 0)
      {
        int rc = gai_port(aihead, sptr->s_port, SOCK_DGRAM);
        if (rc < 0)
          return EAI_MEMORY;
        num_found += rc;
      }
    }
  }

  if (num_found == 0)
  {
    if (hints->ai_socktype == 0)
    {
      // All calls to getservbyname() failed.
      return EAI_NONAME;
    }
    else
    {
      // Service not supported for socket type.
      return EAI_SERVICE;
    }
  }

  return 0;
}