1 /* Binary mode I/O. 2 Copyright (C) 2001, 2003, 2005, 2008-2011 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 /* SET_BINARY (fd); 29 changes the file descriptor fd to perform binary I/O. */ 30 #if O_BINARY 31 # if defined __EMX__ || defined __DJGPP__ || defined __CYGWIN__ 32 # include <io.h> /* declares setmode() */ 33 # else 34 # define setmode _setmode 35 # undef fileno 36 # define fileno _fileno 37 # endif 38 # ifdef __DJGPP__ 39 # include <unistd.h> /* declares isatty() */ 40 /* Avoid putting stdin/stdout in binary mode if it is connected to 41 the console, because that would make it impossible for the user 42 to interrupt the program through Ctrl-C or Ctrl-Break. */ 43 # define SET_BINARY(fd) ((void) (!isatty (fd) ? (setmode (fd, O_BINARY), 0) : 0)) 44 # else 45 # define SET_BINARY(fd) ((void) setmode (fd, O_BINARY)) 46 # endif 47 #else 48 /* On reasonable systems, binary I/O is the default. */ 49 # define SET_BINARY(fd) /* do nothing */ ((void) 0) 50 #endif 51 52 #endif /* _BINARY_H */ 53