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76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/* Binary mode I/O.
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Copyright (C) 2001, 2003, 2005, 2008-2015 Free Software Foundation, 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 <http://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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/* set_binary_mode (fd, mode)
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sets the binary/text I/O mode of file descriptor fd to the given mode
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(must be O_BINARY or O_TEXT) and returns the previous mode. */
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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 set_binary_mode setmode
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# else
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# define set_binary_mode _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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set_binary_mode (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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/* SET_BINARY (fd);
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changes the file descriptor fd to perform binary I/O. */
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#ifdef __DJGPP__
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# include <unistd.h> /* declares isatty() */
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/* Avoid putting stdin/stdout in binary mode if it is connected to
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the console, because that would make it impossible for the user
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to interrupt the program through Ctrl-C or Ctrl-Break. */
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# define SET_BINARY(fd) ((void) (!isatty (fd) ? (set_binary_mode (fd, O_BINARY), 0) : 0))
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#else
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# define SET_BINARY(fd) ((void) set_binary_mode (fd, O_BINARY))
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#endif
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_GL_INLINE_HEADER_END
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#endif /* _BINARY_H */
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