lib/binary-io.h

   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 Lesser 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 Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser 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 */