libc: Fix some more -Wmissing-prototype.
[dragonfly.git] / lib / libc / stdio / fgetwln.c
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1/*-
2 * Copyright (c) 2002-2004 Tim J. Robbins.
3 * All rights reserved.
4 *
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5 * Copyright (c) 2011 The FreeBSD Foundation
6 * All rights reserved.
7 * Portions of this software were developed by David Chisnall
8 * under sponsorship from the FreeBSD Foundation.
9 *
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10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
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30 *
31 * $FreeBSD: head/lib/libc/stdio/fgetwln.c 227753 2011-11-20 14:45:42Z theraven $
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32 */
33
34#include "namespace.h"
35#include <stdio.h>
36#include <wchar.h>
37#include "un-namespace.h"
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38#include "libc_private.h"
39#include "local.h"
0d5acd74 40#include "xlocale_private.h"
62f08720 41
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42wchar_t *fgetwln_l(FILE * __restrict, size_t *, locale_t);
43
62f08720 44wchar_t *
0d5acd74 45fgetwln_l(FILE * __restrict fp, size_t *lenp, locale_t locale)
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46{
47 wint_t wc;
48 size_t len;
0d5acd74 49 FIX_LOCALE(locale);
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50
51 FLOCKFILE(fp);
0d5acd74 52 ORIENT(fp, 1);
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53
54 len = 0;
0d5acd74 55 while ((wc = __fgetwc(fp, locale)) != WEOF) {
62f08720 56#define GROW 512
0d5acd74 57 if (len * sizeof(wchar_t) >= fp->_lb._size &&
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58 __slbexpand(fp, (len + GROW) * sizeof(wchar_t)))
59 goto error;
0d5acd74 60 *((wchar_t *)fp->_lb._base + len++) = wc;
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61 if (wc == L'\n')
62 break;
63 }
64 if (len == 0)
65 goto error;
66
67 FUNLOCKFILE(fp);
68 *lenp = len;
0d5acd74 69 return ((wchar_t *)fp->_lb._base);
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70
71error:
72 FUNLOCKFILE(fp);
73 *lenp = 0;
74 return (NULL);
75}
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76wchar_t *
77fgetwln(FILE * __restrict fp, size_t *lenp)
78{
79 return fgetwln_l(fp, lenp, __get_locale());
80}