/* Copyright (C) 1993-2018 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

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

   As a special exception, if you link the code in this file with

   files compiled with a GNU compiler to produce an executable,

   that does not cause the resulting executable to be covered by

   the GNU Lesser General Public License.  This exception does not

   however invalidate any other reasons why the executable file

   might be covered by the GNU Lesser General Public License.

   This exception applies to code released by its copyright holders

   in files containing the exception.  */

#include "libioP.h"

#include <fcntl.h>

#include <stdlib.h>

#include <stddef.h>

#include <shlib-compat.h>

FILE *

__fopen_maybe_mmap (FILE *fp)

{

#if _G_HAVE_MMAP

  if ((fp->_flags2 & _IO_FLAGS2_MMAP) && (fp->_flags & _IO_NO_WRITES))

    {

      /* Since this is read-only, we might be able to mmap the contents

	 directly.  We delay the decision until the first read attempt by

	 giving it a jump table containing functions that choose mmap or

	 vanilla file operations and reset the jump table accordingly.  */

      if (fp->_mode <= 0)

	_IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps_maybe_mmap;

      else

	_IO_JUMPS_FILE_plus (fp) = &_IO_wfile_jumps_maybe_mmap;

      fp->_wide_data->_wide_vtable = &_IO_wfile_jumps_maybe_mmap;

    }

#endif

  return fp;

}

FILE *

__fopen_internal (const char *filename, const char *mode, int is32)

{

  struct locked_FILE

  {

    struct _IO_FILE_plus fp;

#ifdef _IO_MTSAFE_IO

    _IO_lock_t lock;

#endif

    struct _IO_wide_data wd;

  } *new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));

  if (new_f == NULL)

    return NULL;

#ifdef _IO_MTSAFE_IO

  new_f->fp.file._lock = &new_f->lock;

#endif

  _IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd, &_IO_wfile_jumps);

  _IO_JUMPS (&new_f->fp) = &_IO_file_jumps;

  _IO_new_file_init_internal (&new_f->fp);

  if (_IO_file_fopen ((FILE *) new_f, filename, mode, is32) != NULL)

    return __fopen_maybe_mmap (&new_f->fp.file);

  _IO_un_link (&new_f->fp);

  free (new_f);

  return NULL;

}

FILE *

_IO_new_fopen (const char *filename, const char *mode)

{

  return __fopen_internal (filename, mode, 1);

}

strong_alias (_IO_new_fopen, __new_fopen)

versioned_symbol (libc, _IO_new_fopen, _IO_fopen, GLIBC_2_1);

versioned_symbol (libc, __new_fopen, fopen, GLIBC_2_1);

# if !defined O_LARGEFILE || O_LARGEFILE == 0

weak_alias (_IO_new_fopen, _IO_fopen64)

weak_alias (_IO_new_fopen, fopen64)

# endif