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". */
49: BINARY_IO_INLINE int
50: __gl_setmode (int fd _GL_UNUSED, int mode _GL_UNUSED)
51: {
52: return O_BINARY;
53: }
54: #endif
55:
56: #if defined __DJGPP__ || defined __EMX__
57: extern int __gl_setmode_check (int);
58: #else
59: BINARY_IO_INLINE int
60: __gl_setmode_check (int fd _GL_UNUSED) { return 0; }
61: #endif
62:
63: /* Set FD's mode to MODE, which should be either O_TEXT or O_BINARY.
64: Return the old mode if successful, -1 (setting errno) on failure.
65: Ordinarily this function would be called 'setmode', since that is
66: its name on MS-Windows, but it is called 'set_binary_mode' here
67: to avoid colliding with a BSD function of another name. */
68:
69: BINARY_IO_INLINE int
70: set_binary_mode (int fd, int mode)
71: {
72: int r = __gl_setmode_check (fd);
73: return r != 0 ? r : __gl_setmode (fd, mode);
74: }
75:
76: /* This macro is obsolescent. */
77: #define SET_BINARY(fd) ((void) set_binary_mode (fd, O_BINARY))
78:
79: _GL_INLINE_HEADER_END
80:
81: #endif /* _BINARY_H */
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