binary-io.h 2.37 KB
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/* Binary mode I/O.
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   Copyright (C) 2001, 2003, 2005, 2008-2019 Free Software Foundation, Inc.
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   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
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   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
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#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>

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#ifndef _GL_INLINE_HEADER_BEGIN
 #error "Please include config.h first."
#endif
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_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() */
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#  define __gl_setmode setmode
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# else
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#  define __gl_setmode _setmode
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#  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
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__gl_setmode (int fd _GL_UNUSED, int mode _GL_UNUSED)
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{
  return O_BINARY;
}
#endif

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/* 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.  */

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#if defined __DJGPP__ || defined __EMX__
extern int set_binary_mode (int fd, int mode);
#else
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BINARY_IO_INLINE int
set_binary_mode (int fd, int mode)
{
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  return __gl_setmode (fd, mode);
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}
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#endif
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/* This macro is obsolescent.  */
#define SET_BINARY(fd) ((void) set_binary_mode (fd, O_BINARY))

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_GL_INLINE_HEADER_END

#endif /* _BINARY_H */