1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2013 Ed Schouten <ed@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/queue.h>
30
31#include <assert.h>
32#include <errno.h>
33#include <langinfo.h>
34#include <uchar.h>
35
36#include "../iconv/citrus_hash.h"
37#include "../iconv/citrus_module.h"
38#include "../iconv/citrus_iconv.h"
39#include "mblocal.h"
40
41typedef struct {
42	bool			initialized;
43	struct _citrus_iconv	iconv;
44	union {
45		charXX_t	widechar[SRCBUF_LEN];
46		char		bytes[sizeof(charXX_t) * SRCBUF_LEN];
47	} srcbuf;
48	size_t			srcbuf_len;
49} _ConversionState;
50_Static_assert(sizeof(_ConversionState) <= sizeof(mbstate_t),
51    "Size of _ConversionState must not exceed mbstate_t's size.");
52
53size_t
54cXXrtomb_l(char * __restrict s, charXX_t c, mbstate_t * __restrict ps,
55    locale_t locale)
56{
57	_ConversionState *cs;
58	struct _citrus_iconv *handle;
59	char *src, *dst;
60	size_t srcleft, dstleft, invlen;
61	int err;
62
63	FIX_LOCALE(locale);
64	if (ps == NULL)
65		ps = &(XLOCALE_CTYPE(locale)->cXXrtomb);
66	cs = (_ConversionState *)ps;
67	handle = &cs->iconv;
68
69	/* Reinitialize mbstate_t. */
70	if (s == NULL || !cs->initialized) {
71		if (_citrus_iconv_open(&handle, UTF_XX_INTERNAL,
72		    nl_langinfo_l(CODESET, locale)) != 0) {
73			cs->initialized = false;
74			errno = EINVAL;
75			return (-1);
76		}
77		cs->srcbuf_len = 0;
78		cs->initialized = true;
79		if (s == NULL)
80			return (1);
81	}
82
83	assert(cs->srcbuf_len < sizeof(cs->srcbuf.widechar) / sizeof(charXX_t));
84	cs->srcbuf.widechar[cs->srcbuf_len++] = c;
85
86	/* Perform conversion. */
87	src = cs->srcbuf.bytes;
88	srcleft = cs->srcbuf_len * sizeof(charXX_t);
89	dst = s;
90	dstleft = MB_CUR_MAX_L(locale);
91	err = _citrus_iconv_convert(handle, &src, &srcleft, &dst, &dstleft,
92	    _CITRUS_ICONV_F_HIDE_INVALID, &invlen);
93
94	/* Character is part of a surrogate pair. We need more input. */
95	if (err == EINVAL)
96		return (0);
97	cs->srcbuf_len = 0;
98
99	/* Illegal sequence. */
100	if (dst == s) {
101		errno = EILSEQ;
102		return ((size_t)-1);
103	}
104	return (dst - s);
105}
106
107size_t
108cXXrtomb(char * __restrict s, charXX_t c, mbstate_t * __restrict ps)
109{
110
111	return (cXXrtomb_l(s, c, ps, __get_locale()));
112}
113