/* Test for ptsname/ptsname_r.
   Copyright (C) 2014-2022 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

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

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define DEV_TTY		"/dev/tty"
#define PTSNAME_EINVAL	"./ptsname-einval"

static int
do_single_test (int fd, char *buf, size_t buflen, int expected_err)
{

  int ret = ptsname_r (fd, buf, buflen);
  int err = errno;

  if (expected_err == 0)
    {
      if (ret != 0)
	{
	  printf ("ptsname_r: expected: return = 0\n");
	  printf ("           got: return = %d, errno = %d (%s)\n",
	          ret, err, strerror (err));
	  return 1;
	}
    }
  else
    {
      if (ret == 0 || errno != expected_err)
	{
	  printf ("ptsname_r: expected: return = %d, errno = %d (%s)\n",
	          -1, expected_err, strerror (expected_err));
	  printf ("           got: return = %d, errno = %d (%s)\n",
	          ret, err, strerror (err));
	  return 1;
	}
    }

  return 0;
}

static int
do_test (void)
{
  char buf[512];
  int result = 0;

  /* Tests with a real PTS master.  */
  int fd = posix_openpt (O_RDWR);
  if (fd != -1)
    {
      result |= do_single_test (fd, buf, sizeof (buf), 0);
      result |= do_single_test (fd, buf, 1, ERANGE);
      close (fd);
    }
  else
    printf ("posix_openpt (O_RDWR) failed\nerrno %d (%s)\n",
	    errno, strerror (errno));

  /* Test with a terminal device which is not a PTS master.  */
  fd = open (DEV_TTY, O_RDONLY);
  if (fd != -1)
    {
      result |= do_single_test (fd, buf, sizeof (buf), ENOTTY);
      close (fd);
    }
  else
    printf ("open (\"%s\", O_RDWR) failed\nerrno %d (%s)\n",
	    DEV_TTY, errno, strerror (errno));

  /* Test with a file.  */
  fd = open (PTSNAME_EINVAL, O_RDWR | O_CREAT, 0600);
  if (fd != -1)
    {
      result |= do_single_test (fd, buf, sizeof (buf), ENOTTY);
      close (fd);
      unlink (PTSNAME_EINVAL);
    }
  else
    printf ("open (\"%s\", O_RDWR | OCREAT) failed\nerrno %d (%s)\n",
	    PTSNAME_EINVAL, errno, strerror (errno));

  return result;
}

#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"