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85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/* Binary mode I/O.
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Copyright (C) 2001, 2003, 2005, 2008-2019 Free Software Foundation,
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Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#ifndef _BINARY_H
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#define _BINARY_H
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/* For systems that distinguish between text and binary I/O.
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O_BINARY is guaranteed by the gnulib <fcntl.h>. */
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#include <fcntl.h>
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/* The MSVC7 <stdio.h> doesn't like to be included after '#define fileno ...',
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so we include it here first. */
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#include <stdio.h>
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#ifndef _GL_INLINE_HEADER_BEGIN
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#error "Please include config.h first."
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#endif
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_GL_INLINE_HEADER_BEGIN
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#ifndef BINARY_IO_INLINE
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# define BINARY_IO_INLINE _GL_INLINE
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#endif
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#if O_BINARY
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# if defined __EMX__ || defined __DJGPP__ || defined __CYGWIN__
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# include <io.h> /* declares setmode() */
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# define __gl_setmode setmode
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# else
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# define __gl_setmode _setmode
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# undef fileno
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# define fileno _fileno
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# endif
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#else
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/* On reasonable systems, binary I/O is the only choice. */
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/* Use a function rather than a macro, to avoid gcc warnings
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"warning: statement with no effect". */
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BINARY_IO_INLINE int
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__gl_setmode (int fd, int mode)
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{
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(void) fd;
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(void) mode;
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return O_BINARY;
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}
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#endif
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#if defined __DJGPP__ || defined __EMX__
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extern int __gl_setmode_check (int);
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#else
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BINARY_IO_INLINE int
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__gl_setmode_check (int fd) { return 0; }
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#endif
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/* Set FD's mode to MODE, which should be either O_TEXT or O_BINARY.
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Return the old mode if successful, -1 (setting errno) on failure.
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Ordinarily this function would be called 'setmode', since that is
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its name on MS-Windows, but it is called 'set_binary_mode' here
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to avoid colliding with a BSD function of another name. */
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BINARY_IO_INLINE int
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set_binary_mode (int fd, int mode)
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{
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int r = __gl_setmode_check (fd);
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return r != 0 ? r : __gl_setmode (fd, mode);
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}
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/* This macro is obsolescent. */
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#define SET_BINARY(fd) ((void) set_binary_mode (fd, O_BINARY))
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_GL_INLINE_HEADER_END
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#endif /* _BINARY_H */
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