/* Binary mode I/O.

   Copyright (C) 2001, 2003, 2005, 2008-2019 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 of the License, 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 <https://www.gnu.org/licenses/>.  */

#ifndef _BINARY_H

#define _BINARY_H

/* For systems that distinguish between text and binary I/O.

   O_BINARY is guaranteed by the gnulib <fcntl.h>. */

#include <fcntl.h>

/* The MSVC7 <stdio.h> doesn't like to be included after '#define fileno ...',

   so we include it here first.  */

#include <stdio.h>

#ifndef _GL_INLINE_HEADER_BEGIN

 #error "Please include config.h first."

#endif

_GL_INLINE_HEADER_BEGIN

#ifndef BINARY_IO_INLINE

# define BINARY_IO_INLINE _GL_INLINE

#endif

#if O_BINARY

# if defined __EMX__ || defined __DJGPP__ || defined __CYGWIN__

#  include <io.h> /* declares setmode() */

#  define __gl_setmode setmode

# else

#  define __gl_setmode _setmode

#  undef fileno

#  define fileno _fileno

# endif

#else

  /* On reasonable systems, binary I/O is the only choice.  */

  /* Use a function rather than a macro, to avoid gcc warnings

     "warning: statement with no effect".  */

BINARY_IO_INLINE int

__gl_setmode (int fd _GL_UNUSED, int mode _GL_UNUSED)

{

  return O_BINARY;

}

#endif

#if defined __DJGPP__ || defined __EMX__

extern int __gl_setmode_check (int);

#else

BINARY_IO_INLINE int

__gl_setmode_check (int fd _GL_UNUSED) { return 0; }

#endif

/* Set FD's mode to MODE, which should be either O_TEXT or O_BINARY.

   Return the old mode if successful, -1 (setting errno) on failure.

   Ordinarily this function would be called 'setmode', since that is

   its name on MS-Windows, but it is called 'set_binary_mode' here

   to avoid colliding with a BSD function of another name.  */

BINARY_IO_INLINE int

set_binary_mode (int fd, int mode)

{

  int r = __gl_setmode_check (fd);

  return r != 0 ? r : __gl_setmode (fd, mode);

}

/* This macro is obsolescent.  */

#define SET_BINARY(fd) ((void) set_binary_mode (fd, O_BINARY))

_GL_INLINE_HEADER_END

#endif /* _BINARY_H */