glibc/libio/__fbufsize.c

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/* Copyright (C) 2000-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <stdio_ext.h>
size_t
__fbufsize (FILE *fp)
{
if (fp->_mode > 0)
return fp->_wide_data->_IO_buf_end - fp->_wide_data->_IO_buf_base;
else
return fp->_IO_buf_end - fp->_IO_buf_base;
}