65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
/* Copyright (C) 1993-2022 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, see
|
|
<https://www.gnu.org/licenses/>.
|
|
|
|
As a special exception, if you link the code in this file with
|
|
files compiled with a GNU compiler to produce an executable,
|
|
that does not cause the resulting executable to be covered by
|
|
the GNU Lesser General Public License. This exception does not
|
|
however invalidate any other reasons why the executable file
|
|
might be covered by the GNU Lesser General Public License.
|
|
This exception applies to code released by its copyright holders
|
|
in files containing the exception. */
|
|
|
|
#include "libioP.h"
|
|
#include <wchar.h>
|
|
|
|
wchar_t *
|
|
fgetws_unlocked (wchar_t *buf, int n, FILE *fp)
|
|
{
|
|
size_t count;
|
|
wchar_t *result;
|
|
int old_error;
|
|
CHECK_FILE (fp, NULL);
|
|
if (n <= 0)
|
|
return NULL;
|
|
if (__glibc_unlikely (n == 1))
|
|
{
|
|
/* Another irregular case: since we have to store a NUL byte and
|
|
there is only room for exactly one byte, we don't have to
|
|
read anything. */
|
|
buf[0] = L'\0';
|
|
return buf;
|
|
}
|
|
/* 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->_flags & _IO_ERR_SEEN;
|
|
fp->_flags &= ~_IO_ERR_SEEN;
|
|
count = _IO_getwline (fp, buf, n - 1, L'\n', 1);
|
|
/* If we read in some bytes and errno is EAGAIN, that error will
|
|
be reported for next read. */
|
|
if (count == 0 || ((fp->_flags & _IO_ERR_SEEN) && errno != EAGAIN))
|
|
result = NULL;
|
|
else
|
|
{
|
|
buf[count] = '\0';
|
|
result = buf;
|
|
}
|
|
fp->_flags |= old_error;
|
|
return result;
|
|
}
|