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 <errno.h>
30 #include <uchar.h>
31 #include "mblocal.h"
32
33 typedef struct {
34 char16_t lead_surrogate;
35 mbstate_t c32_mbstate;
36 } _Char16State;
37
38 size_t
c16rtomb_l(char * __restrict s,char16_t c16,mbstate_t * __restrict ps,locale_t locale)39 c16rtomb_l(char * __restrict s, char16_t c16, mbstate_t * __restrict ps,
40 locale_t locale)
41 {
42 _Char16State *cs;
43 char32_t c32;
44
45 FIX_LOCALE(locale);
46 if (ps == NULL)
47 ps = &(XLOCALE_CTYPE(locale)->c16rtomb);
48 cs = (_Char16State *)ps;
49
50 /* If s is a null pointer, the value of parameter c16 is ignored. */
51 if (s == NULL) {
52 c32 = 0;
53 } else if (cs->lead_surrogate >= 0xd800 &&
54 cs->lead_surrogate <= 0xdbff) {
55 /* We should see a trail surrogate now. */
56 if (c16 < 0xdc00 || c16 > 0xdfff) {
57 errno = EILSEQ;
58 return ((size_t)-1);
59 }
60 c32 = 0x10000 + ((cs->lead_surrogate & 0x3ff) << 10 |
61 (c16 & 0x3ff));
62 } else if (c16 >= 0xd800 && c16 <= 0xdbff) {
63 /* Store lead surrogate for next invocation. */
64 cs->lead_surrogate = c16;
65 return (0);
66 } else {
67 /* Regular character. */
68 c32 = c16;
69 }
70 cs->lead_surrogate = 0;
71
72 return (c32rtomb_l(s, c32, &cs->c32_mbstate, locale));
73 }
74
75 size_t
c16rtomb(char * __restrict s,char16_t c16,mbstate_t * __restrict ps)76 c16rtomb(char * __restrict s, char16_t c16, mbstate_t * __restrict ps)
77 {
78
79 return (c16rtomb_l(s, c16, ps, __get_locale()));
80 }
81