Return to binary-io.h CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / libiconv / srclib

libiconv 1.16

    1: /* Binary mode I/O.
    2:    Copyright (C) 2001, 2003, 2005, 2008-2019 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: __gl_setmode (int fd _GL_UNUSED, int mode _GL_UNUSED)
   51: {
   52:   return O_BINARY;
   53: }
   54: #endif
   55: 
   56: #if defined __DJGPP__ || defined __EMX__
   57: extern int __gl_setmode_check (int);
   58: #else
   59: BINARY_IO_INLINE int
   60: __gl_setmode_check (int fd _GL_UNUSED) { return 0; }
   61: #endif
   62: 
   63: /* Set FD's mode to MODE, which should be either O_TEXT or O_BINARY.
   64:    Return the old mode if successful, -1 (setting errno) on failure.
   65:    Ordinarily this function would be called 'setmode', since that is
   66:    its name on MS-Windows, but it is called 'set_binary_mode' here
   67:    to avoid colliding with a BSD function of another name.  */
   68: 
   69: BINARY_IO_INLINE int
   70: set_binary_mode (int fd, int mode)
   71: {
   72:   int r = __gl_setmode_check (fd);
   73:   return r != 0 ? r : __gl_setmode (fd, mode);
   74: }
   75: 
   76: /* This macro is obsolescent.  */
   77: #define SET_BINARY(fd) ((void) set_binary_mode (fd, O_BINARY))
   78: 
   79: _GL_INLINE_HEADER_END
   80: 
   81: #endif /* _BINARY_H */