nuttx-apps/examples/udp/udp_cmdline.c

/****************************************************************************
 * examples/udp/udp_cmdline.c
 *
 *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <arpa/inet.h>

#include "udp.h"

/****************************************************************************
 * Public Data
 ****************************************************************************/

#ifdef CONFIG_EXAMPLES_UDP_IPv6
uint16_t g_server_ipv6[8] =
{
  HTONS(CONFIG_EXAMPLES_UDP_SERVERIPv6ADDR_1),
  HTONS(CONFIG_EXAMPLES_UDP_SERVERIPv6ADDR_2),
  HTONS(CONFIG_EXAMPLES_UDP_SERVERIPv6ADDR_3),
  HTONS(CONFIG_EXAMPLES_UDP_SERVERIPv6ADDR_4),
  HTONS(CONFIG_EXAMPLES_UDP_SERVERIPv6ADDR_5),
  HTONS(CONFIG_EXAMPLES_UDP_SERVERIPv6ADDR_6),
  HTONS(CONFIG_EXAMPLES_UDP_SERVERIPv6ADDR_7),
  HTONS(CONFIG_EXAMPLES_UDP_SERVERIPv6ADDR_8)
};
#else
uint32_t g_server_ipv4 = HTONL(CONFIG_EXAMPLES_UDP_SERVERIP);
#endif

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * show_usage
 ****************************************************************************/

static void show_usage(FAR const char *progname)
{
  fprintf(stderr, "USAGE: %s [<server-addr>]\n", progname);
  exit(1);
}

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * parse_cmdline
 ****************************************************************************/

void parse_cmdline(int argc, char **argv)
{
  /* Currently only a single command line option is supported:  The server
   * IP address.
   */

  if (argc == 2)
    {
      int ret;

      /* Convert the <server-addr> argument into a binary address */

#ifdef CONFIG_EXAMPLES_UDP_IPv6
      ret = inet_pton(AF_INET6, argv[1], g_server_ipv6);
#else
      ret = inet_pton(AF_INET, argv[1], &g_server_ipv4);
#endif
      if (ret < 0)
        {
          fprintf(stderr, "ERROR: <server-addr> is invalid\n");
          show_usage(argv[0]);
        }
    }
  else if (argc != 1)
    {
      fprintf(stderr, "ERROR: Too many arguments\n");
      show_usage(argv[0]);
    }
}