fgetwln.c revision 132242 
1/*-
2 * Copyright (c) 2002-2004 Tim J. Robbins.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/lib/libc/stdio/fgetwln.c 132242 2004-07-16 06:06:09Z tjr $");
29
30#include "namespace.h"
31#include <stdio.h>
32#include <wchar.h>
33#include "un-namespace.h"
34#include "libc_private.h"
35#include "local.h"
36
37wchar_t *
38fgetwln(FILE * __restrict fp, size_t *lenp)
39{
40	wint_t wc;
41	size_t len;
42
43	FLOCKFILE(fp);
44	ORIENT(fp, 1);
45
46	len = 0;
47	while ((wc = __fgetwc(fp)) != WEOF) {
48#define	GROW	512
49		len++;
50		if (len * sizeof(wchar_t) >= fp->_lb._size &&
51		    __slbexpand(fp, (len + GROW) * sizeof(wchar_t)))
52			goto error;
53		*((wchar_t *)fp->_lb._base + len) = wc;
54		if (wc == L'\n')
55			break;
56	}
57	if (len == 0)
58		goto error;
59
60	FUNLOCKFILE(fp);
61	*lenp = len;
62	return ((wchar_t *)fp->_lb._base);
63
64error:
65	FUNLOCKFILE(fp);
66	*lenp = 0;
67	return (NULL);
68}
69