cXXrtomb_iconv.h revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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/cdefs.h>
30__FBSDID("$FreeBSD: stable/11/lib/libc/locale/cXXrtomb_iconv.h 330897 2018-03-14 03:19:51Z eadler $");
31
32#include <sys/queue.h>
33
34#include <assert.h>
35#include <errno.h>
36#include <langinfo.h>
37#include <uchar.h>
38
39#include "../iconv/citrus_hash.h"
40#include "../iconv/citrus_module.h"
41#include "../iconv/citrus_iconv.h"
42#include "xlocale_private.h"
43
44typedef struct {
45	bool			initialized;
46	struct _citrus_iconv	iconv;
47	union {
48		charXX_t	widechar[SRCBUF_LEN];
49		char		bytes[sizeof(charXX_t) * SRCBUF_LEN];
50	} srcbuf;
51	size_t			srcbuf_len;
52} _ConversionState;
53_Static_assert(sizeof(_ConversionState) <= sizeof(mbstate_t),
54    "Size of _ConversionState must not exceed mbstate_t's size.");
55
56size_t
57cXXrtomb_l(char * __restrict s, charXX_t c, mbstate_t * __restrict ps,
58    locale_t locale)
59{
60	_ConversionState *cs;
61	struct _citrus_iconv *handle;
62	char *src, *dst;
63	size_t srcleft, dstleft, invlen;
64	int err;
65
66	FIX_LOCALE(locale);
67	if (ps == NULL)
68		ps = &locale->cXXrtomb;
69	cs = (_ConversionState *)ps;
70	handle = &cs->iconv;
71
72	/* Reinitialize mbstate_t. */
73	if (s == NULL || !cs->initialized) {
74		if (_citrus_iconv_open(&handle, UTF_XX_INTERNAL,
75		    nl_langinfo_l(CODESET, locale)) != 0) {
76			cs->initialized = false;
77			errno = EINVAL;
78			return (-1);
79		}
80		handle->cv_shared->ci_discard_ilseq = true;
81		handle->cv_shared->ci_hooks = NULL;
82		cs->srcbuf_len = 0;
83		cs->initialized = true;
84		if (s == NULL)
85			return (1);
86	}
87
88	assert(cs->srcbuf_len < sizeof(cs->srcbuf.widechar) / sizeof(charXX_t));
89	cs->srcbuf.widechar[cs->srcbuf_len++] = c;
90
91	/* Perform conversion. */
92	src = cs->srcbuf.bytes;
93	srcleft = cs->srcbuf_len * sizeof(charXX_t);
94	dst = s;
95	dstleft = MB_CUR_MAX_L(locale);
96	err = _citrus_iconv_convert(handle, &src, &srcleft, &dst, &dstleft,
97	    0, &invlen);
98
99	/* Character is part of a surrogate pair. We need more input. */
100	if (err == EINVAL)
101		return (0);
102	cs->srcbuf_len = 0;
103
104	/* Illegal sequence. */
105	if (dst == s) {
106		errno = EILSEQ;
107		return ((size_t)-1);
108	}
109	return (dst - s);
110}
111
112size_t
113cXXrtomb(char * __restrict s, charXX_t c, mbstate_t * __restrict ps)
114{
115
116	return (cXXrtomb_l(s, c, ps, __get_locale()));
117}
118