1/* Binary mode I/O.
2 Copyright (C) 2001, 2003, 2005, 2008-2019 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 <https://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#ifndef _GL_INLINE_HEADER_BEGIN
29 #error "Please include config.h first."
30#endif
31_GL_INLINE_HEADER_BEGIN
32#ifndef BINARY_IO_INLINE
33# define BINARY_IO_INLINE _GL_INLINE
34#endif
35
36#if O_BINARY
37# if defined __EMX__ || defined __DJGPP__ || defined __CYGWIN__
38# include <io.h> /* declares setmode() */
39# define __gl_setmode setmode
40# else
41# define __gl_setmode _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
50__gl_setmode (int fd _GL_UNUSED, int mode _GL_UNUSED)
51{
52 return O_BINARY;
53}
54#endif
55
56/* Set FD's mode to MODE, which should be either O_TEXT or O_BINARY.
57 Return the old mode if successful, -1 (setting errno) on failure.
58 Ordinarily this function would be called 'setmode', since that is
59 its name on MS-Windows, but it is called 'set_binary_mode' here
60 to avoid colliding with a BSD function of another name. */
61
62#if defined __DJGPP__ || defined __EMX__
63extern int set_binary_mode (int fd, int mode);
64#else
65BINARY_IO_INLINE int
66set_binary_mode (int fd, int mode)
67{
68 return __gl_setmode (fd, mode);
69}
70#endif
71
72/* This macro is obsolescent. */
73#define SET_BINARY(fd) ((void) set_binary_mode (fd, O_BINARY))
74
75_GL_INLINE_HEADER_END
76
77#endif /* _BINARY_H */
78