1 /* Binary mode I/O.
2 Copyright (C) 2001, 2003, 2005, 2008-2023 Free Software Foundation,
3 Inc.
4
5 This file is free software: you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
9
10 This file is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17
18 #ifndef _BINARY_H
19 #define _BINARY_H
20
21 /* For systems that distinguish between text and binary I/O.
22 O_BINARY is guaranteed by the gnulib <fcntl.h>. */
23 #include <fcntl.h>
24
25 /* The MSVC7 <stdio.h> doesn't like to be included after '#define fileno ...',
26 so we include it here first. */
27 #include <stdio.h>
28
29 #ifndef _GL_INLINE_HEADER_BEGIN
30 #error "Please include config.h first."
31 #endif
32 _GL_INLINE_HEADER_BEGIN
33 #ifndef BINARY_IO_INLINE
34 # define BINARY_IO_INLINE _GL_INLINE
35 #endif
36
37 #if O_BINARY
38 # if defined __EMX__ || defined __DJGPP__ || defined __CYGWIN__
39 # include <io.h> /* declares setmode() */
40 # define __gl_setmode setmode
41 # else
42 # define __gl_setmode _setmode
43 # undef fileno
44 # define fileno _fileno
45 # endif
46 #else
47 /* On reasonable systems, binary I/O is the only choice. */
48 /* Use a function rather than a macro, to avoid gcc warnings
49 "warning: statement with no effect". */
50 BINARY_IO_INLINE int
51 __gl_setmode (_GL_UNUSED int fd, _GL_UNUSED int mode)
52 {
53 return O_BINARY;
54 }
55 #endif
56
57 /* Set FD's mode to MODE, which should be either O_TEXT or O_BINARY.
58 Return the old mode if successful, -1 (setting errno) on failure.
59 Ordinarily this function would be called 'setmode', since that is
60 its old name on MS-Windows, but it is called 'set_binary_mode' here
61 to avoid colliding with a BSD function of another name. */
62
63 #if defined __DJGPP__ || defined __EMX__
64 extern int set_binary_mode (int fd, int mode);
65 #else
66 BINARY_IO_INLINE int
67 set_binary_mode (int fd, int mode)
68 {
69 return __gl_setmode (fd, mode);
70 }
71 #endif
72
73 /* This macro is obsolescent. */
74 #define SET_BINARY(fd) ((void) set_binary_mode (fd, O_BINARY))
75
76 _GL_INLINE_HEADER_END
77
78 #endif /* _BINARY_H */