1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2002-2004 Tim J. Robbins.
5 * All rights reserved.
6 *
7 * Copyright (c) 2011 The FreeBSD Foundation
8 *
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 "namespace.h"
35#include <errno.h>
36#include <stdio.h>
37#include <stdlib.h>
38#include <wchar.h>
39#include "un-namespace.h"
40#include "libc_private.h"
41#include "local.h"
42#include "mblocal.h"
43#include "xlocale_private.h"
44
45/*
46 * MT-safe version.
47 */
48wint_t
49fgetwc_l(FILE *fp, locale_t locale)
50{
51	wint_t r;
52	FIX_LOCALE(locale);
53
54	FLOCKFILE_CANCELSAFE(fp);
55	ORIENT(fp, 1);
56	r = __fgetwc(fp, locale);
57	FUNLOCKFILE_CANCELSAFE();
58
59	return (r);
60}
61
62wint_t
63fgetwc(FILE *fp)
64{
65	return fgetwc_l(fp, __get_locale());
66}
67
68/*
69 * Internal (non-MPSAFE) version of fgetwc().  This version takes an
70 * mbstate_t argument specifying the initial conversion state.  For
71 * wide streams, this should always be fp->_mbstate.  On return, *nread
72 * is set to the number of bytes read.
73 */
74wint_t
75__fgetwc_mbs(FILE *fp, mbstate_t *mbs, int *nread, locale_t locale)
76{
77	wchar_t wc;
78	size_t nconv;
79	struct xlocale_ctype *l = XLOCALE_CTYPE(locale);
80
81	*nread = 0;
82	if (fp->_r <= 0 && __srefill(fp))
83		return (WEOF);
84	do {
85		nconv = l->__mbrtowc(&wc, fp->_p, fp->_r, mbs);
86		if (nconv == (size_t)-1) {
87			fp->_flags |= __SERR;
88			return (WEOF);
89		} else if (nconv == (size_t)-2)
90			continue;
91		else if (nconv == 0) {
92			fp->_p++;
93			fp->_r--;
94			(*nread)++;
95			return (L'\0');
96		} else {
97			fp->_p += nconv;
98			fp->_r -= nconv;
99			*nread += nconv;
100			return (wc);
101		}
102	} while (__srefill(fp) == 0);
103	if (__sfeof(fp)) {
104		fp->_flags |= __SERR;
105		errno = EILSEQ;
106	}
107	return (WEOF);
108}
109