fgetwln.c revision 331722 
1/*-
2 * Copyright (c) 2002-2004 Tim J. Robbins.
3 * All rights reserved.
4 *
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 *
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.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: stable/11/lib/libc/stdio/fgetwln.c 331722 2018-03-29 02:50:57Z eadler $");
34
35#include "namespace.h"
36#include <stdio.h>
37#include <wchar.h>
38#include "un-namespace.h"
39#include "libc_private.h"
40#include "local.h"
41#include "xlocale_private.h"
42
43wchar_t *fgetwln_l(FILE * __restrict, size_t *, locale_t);
44
45wchar_t *
46fgetwln_l(FILE * __restrict fp, size_t *lenp, locale_t locale)
47{
48	wchar_t *ret;
49	wint_t wc;
50	size_t len;
51	int savserr;
52
53	FIX_LOCALE(locale);
54
55	FLOCKFILE_CANCELSAFE(fp);
56	ORIENT(fp, 1);
57
58	savserr = fp->_flags & __SERR;
59	fp->_flags &= ~__SERR;
60
61	len = 0;
62	while ((wc = __fgetwc(fp, locale)) != WEOF) {
63#define	GROW	512
64		if (len * sizeof(wchar_t) >= fp->_lb._size &&
65		    __slbexpand(fp, (len + GROW) * sizeof(wchar_t))) {
66			fp->_flags |= __SERR;
67			goto error;
68		}
69		*((wchar_t *)fp->_lb._base + len++) = wc;
70		if (wc == L'\n')
71			break;
72	}
73	/* fgetwc(3) may set both __SEOF and __SERR at once. */
74	if (__sferror(fp))
75		goto error;
76
77	fp->_flags |= savserr;
78	if (len == 0)
79		goto error;
80
81	*lenp = len;
82	ret = (wchar_t *)fp->_lb._base;
83end:
84	FUNLOCKFILE_CANCELSAFE();
85	return (ret);
86
87error:
88	*lenp = 0;
89	ret = NULL;
90	goto end;
91}
92
93wchar_t *
94fgetwln(FILE * __restrict fp, size_t *lenp)
95{
96	return fgetwln_l(fp, lenp, __get_locale());
97}
98