binary-io.c 1.3 KB
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/* Binary mode I/O.
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   Copyright 2017-2019 Free Software Foundation, Inc.
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   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
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#include <config.h>
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#define BINARY_IO_INLINE _GL_EXTERN_INLINE
#include "binary-io.h"
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#if defined __DJGPP__ || defined __EMX__
# include <unistd.h>

int
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set_binary_mode (int fd, int mode)
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{
  if (isatty (fd))
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    /* If FD refers to a console (not a pipe, not a regular file),
       O_TEXT is the only reasonable mode, both on input and on output.
       Silently ignore the request.  If we were to return -1 here,
       all programs that use xset_binary_mode would fail when run
       with console input or console output.  */
    return O_TEXT;
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  else
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    return __gl_setmode (fd, mode);
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}
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#endif