Line data    Source code

       1             : /* Binary mode I/O.
       2             :    Copyright (C) 2001, 2003, 2005, 2008-2020 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 <https://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             : #if O_BINARY
      37             : # if defined __EMX__ || defined __DJGPP__ || defined __CYGWIN__
      38             : #  include <io.h> /* declares setmode() */
      39             : #  define __gl_setmode setmode
      40             : # else
      41             : #  define __gl_setmode _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           1 : __gl_setmode (int fd _GL_UNUSED, int mode _GL_UNUSED)
      51             : {
      52           1 :   return O_BINARY;
      53             : }
      54             : #endif
      55             : 
      56             : /* Set FD's mode to MODE, which should be either O_TEXT or O_BINARY.
      57             :    Return the old mode if successful, -1 (setting errno) on failure.
      58             :    Ordinarily this function would be called 'setmode', since that is
      59             :    its name on MS-Windows, but it is called 'set_binary_mode' here
      60             :    to avoid colliding with a BSD function of another name.  */
      61             : 
      62             : #if defined __DJGPP__ || defined __EMX__
      63             : extern int set_binary_mode (int fd, int mode);
      64             : #else
      65             : BINARY_IO_INLINE int
      66           1 : set_binary_mode (int fd, int mode)
      67             : {
      68           1 :   return __gl_setmode (fd, mode);
      69             : }
      70             : #endif
      71             : 
      72             : /* This macro is obsolescent.  */
      73             : #define SET_BINARY(fd) ((void) set_binary_mode (fd, O_BINARY))
      74             : 
      75             : _GL_INLINE_HEADER_END
      76             : 
      77             : #endif /* _BINARY_H */