55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
|
/* Copyright (C) 1993, 1995, 1996, 1997, 1998, 1999, 2001, 2005
|
||
|
|
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, write to the Free
|
||
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||
|
|
02111-1307 USA. */
|
||
|
|
|
||
|
|
#include "libioP.h"
|
||
|
|
#include <wchar.h>
|
||
|
|
#include <sys/param.h>
|
||
|
|
|
||
|
|
wchar_t *
|
||
|
|
__fgetws_chk (wchar_t *buf, size_t size, int n, _IO_FILE *fp)
|
||
|
|
{
|
||
|
|
_IO_size_t count;
|
||
|
|
wchar_t *result;
|
||
|
|
int old_error;
|
||
|
|
CHECK_FILE (fp, NULL);
|
||
|
|
if (n <= 0)
|
||
|
|
return NULL;
|
||
|
|
_IO_acquire_lock (fp);
|
||
|
|
/* This is very tricky since a file descriptor may be in the
|
||
|
|
non-blocking mode. The error flag doesn't mean much in this
|
||
|
|
case. We return an error only when there is a new error. */
|
||
|
|
old_error = fp->_IO_file_flags & _IO_ERR_SEEN;
|
||
|
|
fp->_IO_file_flags &= ~_IO_ERR_SEEN;
|
||
|
|
count = _IO_getwline (fp, buf, MIN ((size_t) n - 1, size), L'\n', 1);
|
||
|
|
/* If we read in some bytes and errno is EAGAIN, that error will
|
||
|
|
be reported for next read. */
|
||
|
|
if (count == 0 || (_IO_ferror_unlocked (fp) && errno != EAGAIN))
|
||
|
|
result = NULL;
|
||
|
|
else if (count >= size)
|
||
|
|
__chk_fail ();
|
||
|
|
else
|
||
|
|
{
|
||
|
|
buf[count] = '\0';
|
||
|
|
result = buf;
|
||
|
|
}
|
||
|
|
fp->_IO_file_flags |= old_error;
|
||
|
|
_IO_release_lock (fp);
|
||
|
|
return result;
|
||
|
|
}
|