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". */ 52 BINARY_IO_INLINE int 53 set_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