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("$FreeBSD$");
34
35#include "namespace.h"
36#include <errno.h>
37#include <stdio.h>
38#include <string.h>
39#include <wchar.h>
40#include "un-namespace.h"
41#include "libc_private.h"
42#include "local.h"
43#include "mblocal.h"
44
45wchar_t *
46fgetws_l(wchar_t * __restrict ws, int n, FILE * __restrict fp, locale_t locale)
47{
48	wchar_t *wsp;
49	size_t nconv;
50	const char *src;
51	unsigned char *nl;
52	FIX_LOCALE(locale);
53	struct xlocale_ctype *l = XLOCALE_CTYPE(locale);
54
55	FLOCKFILE(fp);
56	ORIENT(fp, 1);
57
58	if (n <= 0) {
59		errno = EINVAL;
60		goto error;
61	}
62
63	if (fp->_r <= 0 && __srefill(fp))
64		/* EOF */
65		goto error;
66	wsp = ws;
67	do {
68		src = fp->_p;
69		nl = memchr(fp->_p, '\n', fp->_r);
70		nconv = l->__mbsnrtowcs(wsp, &src,
71		    nl != NULL ? (nl - fp->_p + 1) : fp->_r,
72		    n - 1, &fp->_mbstate);
73		if (nconv == (size_t)-1)
74			/* Conversion error */
75			goto error;
76		if (src == NULL) {
77			/*
78			 * We hit a null byte. Increment the character count,
79			 * since mbsnrtowcs()'s return value doesn't include
80			 * the terminating null, then resume conversion
81			 * after the null.
82			 */
83			nconv++;
84			src = memchr(fp->_p, '\0', fp->_r);
85			src++;
86		}
87		fp->_r -= (unsigned char *)src - fp->_p;
88		fp->_p = (unsigned char *)src;
89		n -= nconv;
90		wsp += nconv;
91	} while (wsp[-1] != L'\n' && n > 1 && (fp->_r > 0 ||
92	    __srefill(fp) == 0));
93	if (wsp == ws)
94		/* EOF */
95		goto error;
96	if (!l->__mbsinit(&fp->_mbstate))
97		/* Incomplete character */
98		goto error;
99	*wsp = L'\0';
100	FUNLOCKFILE(fp);
101
102	return (ws);
103
104error:
105	FUNLOCKFILE(fp);
106	return (NULL);
107}
108wchar_t *
109fgetws(wchar_t * __restrict ws, int n, FILE * __restrict fp)
110{
111	return fgetws_l(ws, n, fp, __get_locale());
112}
113