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 _GL_INLINE_HEADER_BEGIN 29 #ifndef BINARY_IO_INLINE 30 # define BINARY_IO_INLINE _GL_INLINE 31 #endif 32 33 /* set_binary_mode (fd, mode) 34 sets the binary/text I/O mode of file descriptor fd to the given mode 35 (must be O_BINARY or O_TEXT) and returns the previous mode. */ 36 #if O_BINARY 37 # if defined __EMX__ || defined __DJGPP__ || defined __CYGWIN__ 38 # include <io.h> /* declares setmode() */ 39 # define set_binary_mode setmode 40 # else 41 # define set_binary_mode _setmode 42 # undef fileno 43 # define fileno _fileno 44 # endif 45 #else 46 /* On reasonable systems, binary I/O is the only choice. */ 47 /* Use a function rather than a macro, to avoid gcc warnings 48 "warning: statement with no effect". */ 49 BINARY_IO_INLINE int 50 set_binary_mode (int fd, int mode) 51 { 52 (void) fd; 53 (void) mode; 54 return O_BINARY; 55 } 56 #endif 57 58 /* SET_BINARY (fd); 59 changes the file descriptor fd to perform binary I/O. */ 60 #ifdef __DJGPP__ 61 # include <unistd.h> /* declares isatty() */ 62 /* Avoid putting stdin/stdout in binary mode if it is connected to 63 the console, because that would make it impossible for the user 64 to interrupt the program through Ctrl-C or Ctrl-Break. */ 65 # define SET_BINARY(fd) ((void) (!isatty (fd) ? (set_binary_mode (fd, O_BINARY), 0) : 0)) 66 #else 67 # define SET_BINARY(fd) ((void) set_binary_mode (fd, O_BINARY)) 68 #endif 69 70 _GL_INLINE_HEADER_END 71 72 #endif /* _BINARY_H */ 73
