1 /* Binary mode I/O.
2    Copyright (C) 2001, 2003, 2005, 2008-2021 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 Lesser 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 Lesser General Public License for more details.
13 
14    You should have received a copy of the GNU Lesser 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 /* 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 old 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__
63 extern int set_binary_mode (int fd, int mode);
64 #else
65 BINARY_IO_INLINE int
66 set_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