1/* Copyright (C) 1993, 95, 96, 97, 98, 99 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, write to the Free
16   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17   02111-1307 USA.
18
19   As a special exception, if you link the code in this file with
20   files compiled with a GNU compiler to produce an executable,
21   that does not cause the resulting executable to be covered by
22   the GNU Lesser General Public License.  This exception does not
23   however invalidate any other reasons why the executable file
24   might be covered by the GNU Lesser General Public License.
25   This exception applies to code released by its copyright holders
26   in files containing the exception.  */
27
28#include "libioP.h"
29#include <wchar.h>
30
31wchar_t *
32fgetws_unlocked (buf, n, fp)
33     wchar_t *buf;
34     int n;
35     _IO_FILE *fp;
36{
37  _IO_size_t count;
38  wchar_t *result;
39  int old_error;
40  CHECK_FILE (fp, NULL);
41  if (n <= 0)
42    return NULL;
43  /* This is very tricky since a file descriptor may be in the
44     non-blocking mode. The error flag doesn't mean much in this
45     case. We return an error only when there is a new error. */
46  old_error = fp->_IO_file_flags & _IO_ERR_SEEN;
47  fp->_IO_file_flags &= ~_IO_ERR_SEEN;
48  count = _IO_getwline (fp, buf, n - 1, L'\n', 1);
49  /* If we read in some bytes and errno is EAGAIN, that error will
50     be reported for next read. */
51  if (count == 0 || ((fp->_IO_file_flags & _IO_ERR_SEEN)
52  		     && errno != EAGAIN))
53    result = NULL;
54  else
55    {
56      buf[count] = '\0';
57      result = buf;
58    }
59  fp->_IO_file_flags |= old_error;
60  return result;
61}
62