A TCP DAYTIME Client

• DAYTIME service prints date and time

• TCP version sends upon connection
  server reads no client data

• UDP version sends upon receiving any message

  #define LINELEN         128
  
  int main(int argc, char *argv[])
  {
      char *host = "localhost";    /* host to use if none supplied */
      char *service = "daytime";   /* default service port         */
  
      switch (argc) {
      case 1:
          host = "localhost";
          break;
      case 3:
          service = argv[2];
          /* FALL THROUGH */
      case 2:
          host = argv[1];
          break;
      default:
          fprintf(stderr, "usage: TCPdaytime [host [port]]\n");
          exit(1);
      }
      TCPdaytime(host, service);
      exit(0);
  }
  
  void TCPdaytime(const char *host, const char *service)
  {
      char        buf[LINELEN+1];         /* buffer for one line of text  */
      int s, n;                   /* socket, read count           */
  
      s = connectTCP(host, service);
  
      while( (n = read(s, buf, LINELEN)) > 0) {
          buf[n] = '\0';          /* ensure null-terminated       */
          (void) fputs( buf, stdout );
      }
  }