/* Test interface name <-> index conversions.

   Copyright (C) 1997-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Philip Blundell <Philip.Blundell@pobox.com>.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <net/if.h>

static int

do_test (void)

{

  int failures = 0;

  struct if_nameindex *idx = if_nameindex (), *p;

  if (idx == NULL)

    {

      if (errno != ENOSYS)

	{

	  printf ("Couldn't get any interfaces.\n");

	  exit (1);

	}

      /* The function is simply not implemented.  */

      exit (0);

    }

  printf ("Idx            Name | Idx           Name\n");

  for (p = idx; p->if_index || p->if_name; ++p)

    {

      char buf[IFNAMSIZ];

      unsigned int ni;

      int result;

      printf ("%3d %15s | ", p->if_index, p->if_name);

      printf ("%3d", ni = if_nametoindex (p->if_name));

      printf ("%15s", if_indextoname (p->if_index, buf));

      result = (ni != p->if_index || (strcmp (buf, p->if_name)));

      if (ni == p->if_index)

	/* We have to make sure that this is not an alias with the

	   same interface number.  */

	if (p->if_index == if_nametoindex (buf))

	  result = 0;

      printf ("%10s", result ? "fail" : "okay");

      printf ("\n");

      failures += result;

    }

  if_freenameindex (idx);

  return failures ? 1 : 0;

}

#define TEST_FUNCTION do_test ()

#include "../test-skeleton.c"