1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2002-2004 Tim J. Robbins.
5 * All rights reserved.
6 *
7 * Copyright (c) 2011 The FreeBSD Foundation
8 * All rights reserved.
9 * Portions of this software were developed by David Chisnall
10 * under sponsorship from the FreeBSD Foundation.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD$");
36
37#include "namespace.h"
38#include <stdio.h>
39#include <wchar.h>
40#include "un-namespace.h"
41#include "libc_private.h"
42#include "local.h"
43#include "xlocale_private.h"
44
45wchar_t *fgetwln_l(FILE * __restrict, size_t *, locale_t);
46
47wchar_t *
48fgetwln_l(FILE * __restrict fp, size_t *lenp, locale_t locale)
49{
50	wchar_t *ret;
51	wint_t wc;
52	size_t len;
53	int savserr;
54
55	FIX_LOCALE(locale);
56
57	FLOCKFILE_CANCELSAFE(fp);
58	ORIENT(fp, 1);
59
60	savserr = fp->_flags & __SERR;
61	fp->_flags &= ~__SERR;
62
63	len = 0;
64	while ((wc = __fgetwc(fp, locale)) != WEOF) {
65#define	GROW	512
66		if (len * sizeof(wchar_t) >= fp->_lb._size &&
67		    __slbexpand(fp, (len + GROW) * sizeof(wchar_t))) {
68			fp->_flags |= __SERR;
69			goto error;
70		}
71		*((wchar_t *)fp->_lb._base + len++) = wc;
72		if (wc == L'\n')
73			break;
74	}
75	/* fgetwc(3) may set both __SEOF and __SERR at once. */
76	if (__sferror(fp))
77		goto error;
78
79	fp->_flags |= savserr;
80	if (len == 0)
81		goto error;
82
83	*lenp = len;
84	ret = (wchar_t *)fp->_lb._base;
85end:
86	FUNLOCKFILE_CANCELSAFE();
87	return (ret);
88
89error:
90	*lenp = 0;
91	ret = NULL;
92	goto end;
93}
94
95wchar_t *
96fgetwln(FILE * __restrict fp, size_t *lenp)
97{
98	return fgetwln_l(fp, lenp, __get_locale());
99}
100