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75 lines
2.5 KiB
75 lines
2.5 KiB
/* Binary mode I/O. |
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Copyright (C) 2001, 2003, 2005, 2008-2017 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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#if defined __DJGPP__ || defined __EMX__ |
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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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