1/* Binary mode I/O.
2   Copyright (C) 2001, 2003, 2005, 2008-2012 Free Software Foundation, Inc.
3
4   This program is free software: you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 3 of the License, or
7   (at your option) any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
16
17#ifndef _BINARY_H
18#define _BINARY_H
19
20/* For systems that distinguish between text and binary I/O.
21   O_BINARY is guaranteed by the gnulib <fcntl.h>. */
22#include <fcntl.h>
23
24/* The MSVC7 <stdio.h> doesn't like to be included after '#define fileno ...',
25   so we include it here first.  */
26#include <stdio.h>
27
28_GL_INLINE_HEADER_BEGIN
29#ifndef BINARY_IO_INLINE
30# define BINARY_IO_INLINE _GL_INLINE
31#endif
32
33/* set_binary_mode (fd, mode)
34   sets the binary/text I/O mode of file descriptor fd to the given mode
35   (must be O_BINARY or O_TEXT) and returns the previous mode.  */
36#if O_BINARY
37# if defined __EMX__ || defined __DJGPP__ || defined __CYGWIN__
38#  include <io.h> /* declares setmode() */
39#  define set_binary_mode setmode
40# else
41#  define set_binary_mode _setmode
42#  undef fileno
43#  define fileno _fileno
44# endif
45#else
46  /* On reasonable systems, binary I/O is the only choice.  */
47  /* Use a function rather than a macro, to avoid gcc warnings
48     "warning: statement with no effect".  */
49BINARY_IO_INLINE int
50set_binary_mode (int fd, int mode)
51{
52  (void) fd;
53  (void) mode;
54  return O_BINARY;
55}
56#endif
57
58/* SET_BINARY (fd);
59   changes the file descriptor fd to perform binary I/O.  */
60#ifdef __DJGPP__
61# include <unistd.h> /* declares isatty() */
62  /* Avoid putting stdin/stdout in binary mode if it is connected to
63     the console, because that would make it impossible for the user
64     to interrupt the program through Ctrl-C or Ctrl-Break.  */
65# define SET_BINARY(fd) ((void) (!isatty (fd) ? (set_binary_mode (fd, O_BINARY), 0) : 0))
66#else
67# define SET_BINARY(fd) ((void) set_binary_mode (fd, O_BINARY))
68#endif
69
70_GL_INLINE_HEADER_END
71
72#endif /* _BINARY_H */
73