cXXrtomb_iconv.h revision 282275 
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: stable/10/lib/libc/locale/cXXrtomb_iconv.h 282275 2015-04-30 16:08:47Z tijl $");
29
30#include <sys/queue.h>
31
32#include <assert.h>
33#include <errno.h>
34#include <langinfo.h>
35#include <uchar.h>
36
37#include "../iconv/citrus_hash.h"
38#include "../iconv/citrus_module.h"
39#include "../iconv/citrus_iconv.h"
40#include "xlocale_private.h"
41
42typedef struct {
43	bool			initialized;
44	struct _citrus_iconv	iconv;
45	union {
46		charXX_t	widechar[SRCBUF_LEN];
47		char		bytes[sizeof(charXX_t) * SRCBUF_LEN];
48	} srcbuf;
49	size_t			srcbuf_len;
50} _ConversionState;
51_Static_assert(sizeof(_ConversionState) <= sizeof(mbstate_t),
52    "Size of _ConversionState must not exceed mbstate_t's size.");
53
54size_t
55cXXrtomb_l(char * __restrict s, charXX_t c, mbstate_t * __restrict ps,
56    locale_t locale)
57{
58	_ConversionState *cs;
59	struct _citrus_iconv *handle;
60	char *src, *dst;
61	size_t srcleft, dstleft, invlen;
62	int err;
63
64	FIX_LOCALE(locale);
65	if (ps == NULL)
66		ps = &locale->cXXrtomb;
67	cs = (_ConversionState *)ps;
68	handle = &cs->iconv;
69
70	/* Reinitialize mbstate_t. */
71	if (s == NULL || !cs->initialized) {
72		if (_citrus_iconv_open(&handle, UTF_XX_INTERNAL,
73		    nl_langinfo_l(CODESET, locale)) != 0) {
74			cs->initialized = false;
75			errno = EINVAL;
76			return (-1);
77		}
78		handle->cv_shared->ci_discard_ilseq = true;
79		handle->cv_shared->ci_hooks = NULL;
80		cs->srcbuf_len = 0;
81		cs->initialized = true;
82		if (s == NULL)
83			return (1);
84	}
85
86	assert(cs->srcbuf_len < sizeof(cs->srcbuf.widechar) / sizeof(charXX_t));
87	cs->srcbuf.widechar[cs->srcbuf_len++] = c;
88
89	/* Perform conversion. */
90	src = cs->srcbuf.bytes;
91	srcleft = cs->srcbuf_len * sizeof(charXX_t);
92	dst = s;
93	dstleft = MB_CUR_MAX_L(locale);
94	err = _citrus_iconv_convert(handle, &src, &srcleft, &dst, &dstleft,
95	    0, &invlen);
96
97	/* Character is part of a surrogate pair. We need more input. */
98	if (err == EINVAL)
99		return (0);
100	cs->srcbuf_len = 0;
101
102	/* Illegal sequence. */
103	if (dst == s) {
104		errno = EILSEQ;
105		return ((size_t)-1);
106	}
107	return (dst - s);
108}
109
110size_t
111cXXrtomb(char * __restrict s, charXX_t c, mbstate_t * __restrict ps)
112{
113
114	return (cXXrtomb_l(s, c, ps, __get_locale()));
115}
116