1/* Binary mode I/O. 2 Copyright (C) 2001, 2003, 2005, 2008-2014 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 <http://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/* set_binary_mode (fd, mode) 37 sets the binary/text I/O mode of file descriptor fd to the given mode 38 (must be O_BINARY or O_TEXT) and returns the previous mode. */ 39#if O_BINARY 40# if defined __EMX__ || defined __DJGPP__ || defined __CYGWIN__ 41# include <io.h> /* declares setmode() */ 42# define set_binary_mode setmode 43# else 44# define set_binary_mode _setmode 45# undef fileno 46# define fileno _fileno 47# endif 48#else 49 /* On reasonable systems, binary I/O is the only choice. */ 50 /* Use a function rather than a macro, to avoid gcc warnings 51 "warning: statement with no effect". */ 52BINARY_IO_INLINE int 53set_binary_mode (int fd, int mode) 54{ 55 (void) fd; 56 (void) mode; 57 return O_BINARY; 58} 59#endif 60 61/* SET_BINARY (fd); 62 changes the file descriptor fd to perform binary I/O. */ 63#ifdef __DJGPP__ 64# include <unistd.h> /* declares isatty() */ 65 /* Avoid putting stdin/stdout in binary mode if it is connected to 66 the console, because that would make it impossible for the user 67 to interrupt the program through Ctrl-C or Ctrl-Break. */ 68# define SET_BINARY(fd) ((void) (!isatty (fd) ? (set_binary_mode (fd, O_BINARY), 0) : 0)) 69#else 70# define SET_BINARY(fd) ((void) set_binary_mode (fd, O_BINARY)) 71#endif 72 73_GL_INLINE_HEADER_END 74 75#endif /* _BINARY_H */ 76