1 /* Binary mode I/O. 2 Copyright (C) 2001, 2003, 2005, 2008-2012 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_mode (fd, mode) 29 sets the binary/text I/O mode of file descriptor fd to the given mode 30 (must be O_BINARY or O_TEXT) and returns the previous mode. */ 31 #if O_BINARY 32 # if defined __EMX__ || defined __DJGPP__ || defined __CYGWIN__ 33 # include <io.h> /* declares setmode() */ 34 # define set_binary_mode setmode 35 # else 36 # define set_binary_mode _setmode 37 # undef fileno 38 # define fileno _fileno 39 # endif 40 #else 41 /* On reasonable systems, binary I/O is the only choice. */ 42 /* Use an inline function rather than a macro, to avoid gcc warnings 43 "warning: statement with no effect". */ 44 static inline int 45 set_binary_mode (int fd, int mode) 46 { 47 (void) fd; 48 (void) mode; 49 return O_BINARY; 50 } 51 #endif 52 53 /* SET_BINARY (fd); 54 changes the file descriptor fd to perform binary I/O. */ 55 #ifdef __DJGPP__ 56 # include <unistd.h> /* declares isatty() */ 57 /* Avoid putting stdin/stdout in binary mode if it is connected to 58 the console, because that would make it impossible for the user 59 to interrupt the program through Ctrl-C or Ctrl-Break. */ 60 # define SET_BINARY(fd) ((void) (!isatty (fd) ? (set_binary_mode (fd, O_BINARY), 0) : 0)) 61 #else 62 # define SET_BINARY(fd) ((void) set_binary_mode (fd, O_BINARY)) 63 #endif 64 65 #endif /* _BINARY_H */ 66