fgetwln.c revision 1.1 
1/*	$NetBSD: fgetwln.c,v 1.1 2005/05/14 23:51:02 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2002-2004 Tim J. Robbins.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30#if defined(LIBC_SCCS) && !defined(lint)
31#if 0
32__FBSDID("$FreeBSD: src/lib/libc/stdio/fgetwln.c,v 1.2 2004/08/06 17:00:09 tjr Exp $");
33#else
34__RCSID("$NetBSD: fgetwln.c,v 1.1 2005/05/14 23:51:02 christos Exp $");
35#endif
36#endif /* LIBC_SCCS and not lint */
37
38#include "namespace.h"
39#include <stdio.h>
40#include <wchar.h>
41#include "reentrant.h"
42#include "local.h"
43
44#ifdef __weak_alias
45__weak_alias(fgetwln,_fgetwln)
46#endif
47
48wchar_t *
49fgetwln(FILE * __restrict fp, size_t *lenp)
50{
51	wint_t wc;
52	size_t len;
53
54	FLOCKFILE(fp);
55	_SET_ORIENTATION(fp, 1);
56
57	len = 0;
58	while ((wc = __fgetwc_unlock(fp)) != WEOF) {
59#define	GROW	512
60		if (len * sizeof(wchar_t) >= fp->_lb._size &&
61		    __slbexpand(fp, (len + GROW) * sizeof(wchar_t)))
62			goto error;
63		*((wchar_t *)(void *)fp->_lb._base + len++) = wc;
64		if (wc == L'\n')
65			break;
66	}
67	if (len == 0)
68		goto error;
69
70	FUNLOCKFILE(fp);
71	*lenp = len;
72	return ((wchar_t *)(void *)fp->_lb._base);
73
74error:
75	FUNLOCKFILE(fp);
76	*lenp = 0;
77	return (NULL);
78}
79