1  /* Copyright (C) 2000-2023 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     <https://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  }