1/*-
2 * Copyright (c) 2013 Ed Schouten <ed@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <errno.h>
31#include <uchar.h>
32#include "xlocale_private.h"
33
34typedef struct {
35	char16_t	lead_surrogate;
36	mbstate_t	c32_mbstate;
37} _Char16State;
38
39size_t
40c16rtomb_l(char * __restrict s, char16_t c16, mbstate_t * __restrict ps,
41    locale_t locale)
42{
43	_Char16State *cs;
44	char32_t c32;
45
46	FIX_LOCALE(locale);
47	if (ps == NULL)
48		ps = &locale->c16rtomb;
49	cs = (_Char16State *)ps;
50
51	/* If s is a null pointer, the value of parameter c16 is ignored. */
52	if (s == NULL) {
53		c32 = 0;
54	} else if (cs->lead_surrogate >= 0xd800 &&
55	    cs->lead_surrogate <= 0xdbff) {
56		/* We should see a trail surrogate now. */
57		if (c16 < 0xdc00 || c16 > 0xdfff) {
58			errno = EILSEQ;
59			return ((size_t)-1);
60		}
61		c32 = 0x10000 + ((cs->lead_surrogate & 0x3ff) << 10 |
62		    (c16 & 0x3ff));
63	} else if (c16 >= 0xd800 && c16 <= 0xdbff) {
64		/* Store lead surrogate for next invocation. */
65		cs->lead_surrogate = c16;
66		return (0);
67	} else {
68		/* Regular character. */
69		c32 = c16;
70	}
71	cs->lead_surrogate = 0;
72
73	return (c32rtomb_l(s, c32, &cs->c32_mbstate, locale));
74}
75
76size_t
77c16rtomb(char * __restrict s, char16_t c16, mbstate_t * __restrict ps)
78{
79
80	return (c16rtomb_l(s, c16, ps, __get_locale()));
81}
82