libio/__fpurge.c

   1 /* Copyright (C) 2000-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <stdio_ext.h>
  19 #include "libioP.h"
  20
  21 void
  22 __fpurge (FILE *fp)
  23 {
  24   if (fp->_mode > 0)
  25     {
  26       /* Wide-char stream.  */
  27       if (_IO_in_backup (fp))
  28         _IO_free_wbackup_area (fp);
  29
  30       fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_read_ptr;
  31       fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_base;
  32     }
  33   else
  34     {
  35       /* Byte stream.  */
  36       if (_IO_in_backup (fp))
  37         _IO_free_backup_area (fp);
  38
  39       fp->_IO_read_end = fp->_IO_read_ptr;
  40       fp->_IO_write_ptr = fp->_IO_write_base;
  41     }
  42 }