1 /* Copyright (C) 2000-2022 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
__fpurge(FILE * fp)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 }
43