1/* $FreeBSD$ */
2/*	$NetBSD: citrus_euctw.c,v 1.11 2008/06/14 16:01:07 tnozaki Exp $	*/
3
4/*-
5 * SPDX-License-Identifier: BSD-2-Clause
6 *
7 * Copyright (c)2002 Citrus Project,
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32/*-
33 * Copyright (c)1999 Citrus Project,
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 *    notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 *    notice, this list of conditions and the following disclaimer in the
43 *    documentation and/or other materials provided with the distribution.
44 *
45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
55 * SUCH DAMAGE.
56 *
57 *	$Citrus: xpg4dl/FreeBSD/lib/libc/locale/euctw.c,v 1.13 2001/06/21 01:51:44 yamt Exp $
58 */
59
60#include <sys/cdefs.h>
61#include <sys/types.h>
62
63#include <assert.h>
64#include <errno.h>
65#include <limits.h>
66#include <stddef.h>
67#include <stdio.h>
68#include <stdlib.h>
69#include <string.h>
70#include <wchar.h>
71
72#include "citrus_namespace.h"
73#include "citrus_types.h"
74#include "citrus_module.h"
75#include "citrus_stdenc.h"
76#include "citrus_euctw.h"
77
78
79/* ----------------------------------------------------------------------
80 * private stuffs used by templates
81 */
82
83typedef struct {
84	int	 chlen;
85	char	 ch[4];
86} _EUCTWState;
87
88typedef struct {
89	int	 dummy;
90} _EUCTWEncodingInfo;
91
92#define	_SS2	0x008e
93#define	_SS3	0x008f
94
95#define _CEI_TO_EI(_cei_)		(&(_cei_)->ei)
96#define _CEI_TO_STATE(_cei_, _func_)	(_cei_)->states.s_##_func_
97
98#define _FUNCNAME(m)			_citrus_EUCTW_##m
99#define _ENCODING_INFO			_EUCTWEncodingInfo
100#define _ENCODING_STATE			_EUCTWState
101#define _ENCODING_MB_CUR_MAX(_ei_)	4
102#define _ENCODING_IS_STATE_DEPENDENT	0
103#define _STATE_NEEDS_EXPLICIT_INIT(_ps_)	0
104
105static __inline int
106_citrus_EUCTW_cs(unsigned int c)
107{
108
109	c &= 0xff;
110
111	return ((c & 0x80) ? (c == _SS2 ? 2 : 1) : 0);
112}
113
114static __inline int
115_citrus_EUCTW_count(int cs)
116{
117
118	switch (cs) {
119	case 0:
120		/*FALLTHROUGH*/
121	case 1:
122		/*FALLTHROUGH*/
123	case 2:
124		return (1 << cs);
125	case 3:
126		abort();
127		/*NOTREACHED*/
128	}
129	return (0);
130}
131
132static __inline void
133/*ARGSUSED*/
134_citrus_EUCTW_init_state(_EUCTWEncodingInfo * __restrict ei __unused,
135    _EUCTWState * __restrict s)
136{
137
138	memset(s, 0, sizeof(*s));
139}
140
141#if 0
142static __inline void
143/*ARGSUSED*/
144_citrus_EUCTW_pack_state(_EUCTWEncodingInfo * __restrict ei __unused,
145    void * __restrict pspriv, const _EUCTWState * __restrict s)
146{
147
148	memcpy(pspriv, (const void *)s, sizeof(*s));
149}
150
151static __inline void
152/*ARGSUSED*/
153_citrus_EUCTW_unpack_state(_EUCTWEncodingInfo * __restrict ei __unused,
154    _EUCTWState * __restrict s, const void * __restrict pspriv)
155{
156
157	memcpy((void *)s, pspriv, sizeof(*s));
158}
159#endif
160
161static int
162/*ARGSUSED*/
163_citrus_EUCTW_encoding_module_init(_EUCTWEncodingInfo * __restrict ei,
164    const void * __restrict var __unused, size_t lenvar __unused)
165{
166
167	memset((void *)ei, 0, sizeof(*ei));
168
169	return (0);
170}
171
172static void
173/*ARGSUSED*/
174_citrus_EUCTW_encoding_module_uninit(_EUCTWEncodingInfo *ei __unused)
175{
176
177}
178
179static int
180_citrus_EUCTW_mbrtowc_priv(_EUCTWEncodingInfo * __restrict ei,
181    wchar_t * __restrict pwc, char ** __restrict s,
182    size_t n, _EUCTWState * __restrict psenc, size_t * __restrict nresult)
183{
184	char *s0;
185	wchar_t wchar;
186	int c, chlenbak, cs;
187
188	s0 = *s;
189
190	if (s0 == NULL) {
191		_citrus_EUCTW_init_state(ei, psenc);
192		*nresult = 0; /* state independent */
193		return (0);
194	}
195
196	chlenbak = psenc->chlen;
197
198	/* make sure we have the first byte in the buffer */
199	switch (psenc->chlen) {
200	case 0:
201		if (n < 1)
202			goto restart;
203		psenc->ch[0] = *s0++;
204		psenc->chlen = 1;
205		n--;
206		break;
207	case 1:
208	case 2:
209		break;
210	default:
211		/* illgeal state */
212		goto ilseq;
213	}
214
215	c = _citrus_EUCTW_count(cs = _citrus_EUCTW_cs(psenc->ch[0] & 0xff));
216	if (c == 0)
217		goto ilseq;
218	while (psenc->chlen < c) {
219		if (n < 1)
220			goto ilseq;
221		psenc->ch[psenc->chlen] = *s0++;
222		psenc->chlen++;
223		n--;
224	}
225
226	wchar = 0;
227	switch (cs) {
228	case 0:
229		if (psenc->ch[0] & 0x80)
230			goto ilseq;
231		wchar = psenc->ch[0] & 0xff;
232		break;
233	case 1:
234		if (!(psenc->ch[0] & 0x80) || !(psenc->ch[1] & 0x80))
235			goto ilseq;
236		wchar = ((psenc->ch[0] & 0xff) << 8) | (psenc->ch[1] & 0xff);
237		wchar |= 'G' << 24;
238		break;
239	case 2:
240		if ((unsigned char)psenc->ch[1] < 0xa1 ||
241		    0xa7 < (unsigned char)psenc->ch[1])
242			goto ilseq;
243		if (!(psenc->ch[2] & 0x80) || !(psenc->ch[3] & 0x80))
244			goto ilseq;
245		wchar = ((psenc->ch[2] & 0xff) << 8) | (psenc->ch[3] & 0xff);
246		wchar |= ('G' + psenc->ch[1] - 0xa1) << 24;
247		break;
248	default:
249		goto ilseq;
250	}
251
252	*s = s0;
253	psenc->chlen = 0;
254
255	if (pwc)
256		*pwc = wchar;
257	*nresult = wchar ? c - chlenbak : 0;
258	return (0);
259
260ilseq:
261	psenc->chlen = 0;
262	*nresult = (size_t)-1;
263	return (EILSEQ);
264
265restart:
266	*s = s0;
267	*nresult = (size_t)-1;
268	return (0);
269}
270
271static int
272_citrus_EUCTW_wcrtomb_priv(_EUCTWEncodingInfo * __restrict ei __unused,
273    char * __restrict s, size_t n, wchar_t wc,
274    _EUCTWState * __restrict psenc __unused, size_t * __restrict nresult)
275{
276	wchar_t cs, v;
277	int clen, i, ret;
278	size_t len;
279
280	cs = wc & 0x7f000080;
281	clen = 1;
282	if (wc & 0x00007f00)
283		clen = 2;
284	if ((wc & 0x007f0000) && !(wc & 0x00800000))
285		clen = 3;
286
287	if (clen == 1 && cs == 0x00000000) {
288		/* ASCII */
289		len = 1;
290		if (n < len) {
291			ret = E2BIG;
292			goto err;
293		}
294		v = wc & 0x0000007f;
295	} else if (clen == 2 && cs == ('G' << 24)) {
296		/* CNS-11643-1 */
297		len = 2;
298		if (n < len) {
299			ret = E2BIG;
300			goto err;
301		}
302		v = wc & 0x00007f7f;
303		v |= 0x00008080;
304	} else if (clen == 2 && 'H' <= (cs >> 24) && (cs >> 24) <= 'M') {
305		/* CNS-11643-[2-7] */
306		len = 4;
307		if (n < len) {
308			ret = E2BIG;
309			goto err;
310		}
311		*s++ = _SS2;
312		*s++ = (cs >> 24) - 'H' + 0xa2;
313		v = wc & 0x00007f7f;
314		v |= 0x00008080;
315	} else {
316		ret = EILSEQ;
317		goto err;
318	}
319
320	i = clen;
321	while (i-- > 0)
322		*s++ = (v >> (i << 3)) & 0xff;
323
324	*nresult = len;
325	return (0);
326
327err:
328	*nresult = (size_t)-1;
329	return (ret);
330}
331
332static __inline int
333/*ARGSUSED*/
334_citrus_EUCTW_stdenc_wctocs(_EUCTWEncodingInfo * __restrict ei __unused,
335    _csid_t * __restrict csid, _index_t * __restrict idx, wchar_t wc)
336{
337
338	*csid = (_csid_t)(wc >> 24) & 0xFF;
339	*idx  = (_index_t)(wc & 0x7F7F);
340
341	return (0);
342}
343
344static __inline int
345/*ARGSUSED*/
346_citrus_EUCTW_stdenc_cstowc(_EUCTWEncodingInfo * __restrict ei __unused,
347    wchar_t * __restrict wc, _csid_t csid, _index_t idx)
348{
349
350	if (csid == 0) {
351		if ((idx & ~0x7F) != 0)
352			return (EINVAL);
353		*wc = (wchar_t)idx;
354	} else {
355		if (csid < 'G' || csid > 'M' || (idx & ~0x7F7F) != 0)
356			return (EINVAL);
357		*wc = (wchar_t)idx | ((wchar_t)csid << 24);
358	}
359
360	return (0);
361}
362
363static __inline int
364/*ARGSUSED*/
365_citrus_EUCTW_stdenc_get_state_desc_generic(_EUCTWEncodingInfo * __restrict ei __unused,
366    _EUCTWState * __restrict psenc, int * __restrict rstate)
367{
368
369	*rstate = (psenc->chlen == 0) ? _STDENC_SDGEN_INITIAL :
370	    _STDENC_SDGEN_INCOMPLETE_CHAR;
371	return (0);
372}
373
374/* ----------------------------------------------------------------------
375 * public interface for stdenc
376 */
377
378_CITRUS_STDENC_DECLS(EUCTW);
379_CITRUS_STDENC_DEF_OPS(EUCTW);
380
381#include "citrus_stdenc_template.h"
382