/* Test of fgetc() function.

   Copyright (C) 2011-2017 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3, or (at your option)

   any later version.

   This program 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 General Public License for more details.

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

   along with this program; if not, see <http://www.gnu.org/licenses/>.  */

#include <config.h>

#include <stdio.h>

#include "signature.h"

SIGNATURE_CHECK (fgetc, int, (FILE *));

#include <errno.h>

#include <fcntl.h>

#include <unistd.h>

#if HAVE_MSVC_INVALID_PARAMETER_HANDLER

# include "msvc-inval.h"

#endif

#include "macros.h"

int

main (int argc, char **argv)

{

  const char *filename = "test-fgetc.txt";

  /* We don't have an fgetc() function that installs an invalid parameter

     handler so far.  So install that handler here, explicitly.  */

#if HAVE_MSVC_INVALID_PARAMETER_HANDLER \

    && MSVC_INVALID_PARAMETER_HANDLING == DEFAULT_HANDLING

  gl_msvc_inval_ensure_handler ();

#endif

  /* Prepare a file.  */

  {

    const char text[] = "hello world";

    int fd = open (filename, O_RDWR | O_CREAT | O_TRUNC, 0600);

    ASSERT (fd >= 0);

    ASSERT (write (fd, text, sizeof (text)) == sizeof (text));

    ASSERT (close (fd) == 0);

  }

  /* Test that fgetc() sets errno if someone else closes the stream

     fd behind the back of stdio.  */

  {

    FILE *fp = fopen (filename, "r");

    ASSERT (fp != NULL);

    ASSERT (close (fileno (fp)) == 0);

    errno = 0;

    ASSERT (fgetc (fp) == EOF);

    ASSERT (errno == EBADF);

    ASSERT (ferror (fp));

    fclose (fp);

  }

  /* Test that fgetc() sets errno if the stream was constructed with

     an invalid file descriptor.  */

  {

    FILE *fp = fdopen (-1, "r");

    if (fp != NULL)

      {

        errno = 0;

        ASSERT (fgetc (fp) == EOF);

        ASSERT (errno == EBADF);

        ASSERT (ferror (fp));

        fclose (fp);

      }

  }

  {

    FILE *fp;

    close (99);

    fp = fdopen (99, "r");

    if (fp != NULL)

      {

        errno = 0;

        ASSERT (fgetc (fp) == EOF);

        ASSERT (errno == EBADF);

        ASSERT (ferror (fp));

        fclose (fp);

      }

  }

  /* Clean up.  */

  unlink (filename);

  return 0;

}