1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2002-2004 Tim J. Robbins.
5 * All rights reserved.
6 *
7 * Copyright (c) 2011 The FreeBSD Foundation
8 * All rights reserved.
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 <sys/cdefs.h>
35__FBSDID("$FreeBSD$");
36
37#include "namespace.h"
38#include <errno.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <wchar.h>
42#include "un-namespace.h"
43#include "libc_private.h"
44#include "local.h"
45#include "mblocal.h"
46#include "xlocale_private.h"
47
48/*
49 * MT-safe version.
50 */
51wint_t
52fgetwc_l(FILE *fp, locale_t locale)
53{
54	wint_t r;
55	FIX_LOCALE(locale);
56
57	FLOCKFILE_CANCELSAFE(fp);
58	ORIENT(fp, 1);
59	r = __fgetwc(fp, locale);
60	FUNLOCKFILE_CANCELSAFE();
61
62	return (r);
63}
64
65wint_t
66fgetwc(FILE *fp)
67{
68	return fgetwc_l(fp, __get_locale());
69}
70
71/*
72 * Internal (non-MPSAFE) version of fgetwc().  This version takes an
73 * mbstate_t argument specifying the initial conversion state.  For
74 * wide streams, this should always be fp->_mbstate.  On return, *nread
75 * is set to the number of bytes read.
76 */
77wint_t
78__fgetwc_mbs(FILE *fp, mbstate_t *mbs, int *nread, locale_t locale)
79{
80	wchar_t wc;
81	size_t nconv;
82	struct xlocale_ctype *l = XLOCALE_CTYPE(locale);
83
84	*nread = 0;
85	if (fp->_r <= 0 && __srefill(fp))
86		return (WEOF);
87	do {
88		nconv = l->__mbrtowc(&wc, fp->_p, fp->_r, mbs);
89		if (nconv == (size_t)-1) {
90			fp->_flags |= __SERR;
91			return (WEOF);
92		} else if (nconv == (size_t)-2)
93			continue;
94		else if (nconv == 0) {
95			fp->_p++;
96			fp->_r--;
97			(*nread)++;
98			return (L'\0');
99		} else {
100			fp->_p += nconv;
101			fp->_r -= nconv;
102			*nread += nconv;
103			return (wc);
104		}
105	} while (__srefill(fp) == 0);
106	if (__sfeof(fp)) {
107		fp->_flags |= __SERR;
108		errno = EILSEQ;
109	}
110	return (WEOF);
111}
112