1  /* Binary mode I/O.
       2     Copyright (C) 2001, 2003, 2005, 2008-2023 Free Software Foundation, Inc.
       3  
       4     This file is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU Lesser General Public License as
       6     published by the Free Software Foundation; either version 2.1 of the
       7     License, or (at your option) any later version.
       8  
       9     This file 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 <https://www.gnu.org/licenses/>.  */
      16  
      17  #ifndef _BINARY_H
      18  #define _BINARY_H
      19  
      20  /* This file uses _GL_INLINE_HEADER_BEGIN, _GL_INLINE, _GL_UNUSED.  */
      21  #if !_GL_CONFIG_H_INCLUDED
      22   #error "Please include config.h first."
      23  #endif
      24  
      25  /* For systems that distinguish between text and binary I/O.
      26     O_BINARY is guaranteed by the gnulib <fcntl.h>. */
      27  #include <fcntl.h>
      28  
      29  /* The MSVC7 <stdio.h> doesn't like to be included after '#define fileno ...',
      30     so we include it here first.  */
      31  #include <stdio.h>
      32  
      33  _GL_INLINE_HEADER_BEGIN
      34  #ifndef BINARY_IO_INLINE
      35  # define BINARY_IO_INLINE _GL_INLINE
      36  #endif
      37  
      38  #if O_BINARY
      39  # if defined __EMX__ || defined __DJGPP__ || defined __CYGWIN__
      40  #  include <io.h> /* declares setmode() */
      41  #  define __gl_setmode setmode
      42  # else
      43  #  define __gl_setmode _setmode
      44  #  undef fileno
      45  #  define fileno _fileno
      46  # endif
      47  #else
      48    /* On reasonable systems, binary I/O is the only choice.  */
      49    /* Use a function rather than a macro, to avoid gcc warnings
      50       "warning: statement with no effect".  */
      51  BINARY_IO_INLINE int
      52  __gl_setmode (_GL_UNUSED int fd, _GL_UNUSED int mode)
      53  {
      54    return O_BINARY;
      55  }
      56  #endif
      57  
      58  /* Set FD's mode to MODE, which should be either O_TEXT or O_BINARY.
      59     Return the old mode if successful, -1 (setting errno) on failure.
      60     Ordinarily this function would be called 'setmode', since that is
      61     its old name on MS-Windows, but it is called 'set_binary_mode' here
      62     to avoid colliding with a BSD function of another name.  */
      63  
      64  #if defined __DJGPP__ || defined __EMX__
      65  extern int set_binary_mode (int fd, int mode);
      66  #else
      67  BINARY_IO_INLINE int
      68  set_binary_mode (int fd, int mode)
      69  {
      70    return __gl_setmode (fd, mode);
      71  }
      72  #endif
      73  
      74  /* This macro is obsolescent.  */
      75  #define SET_BINARY(fd) ((void) set_binary_mode (fd, O_BINARY))
      76  
      77  _GL_INLINE_HEADER_END
      78  
      79  #endif /* _BINARY_H */