1/*	$NetBSD: citrus_euc.c,v 1.12.6.1 2009/01/04 17:02:19 christos Exp $	*/
2
3/*-
4 * Copyright (c)2002 Citrus Project,
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/*-
30 * Copyright (c) 1993
31 *	The Regents of the University of California.  All rights reserved.
32 *
33 * This code is derived from software contributed to Berkeley by
34 * Paul Borman at Krystal Technologies.
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 * 3. Neither the name of the University nor the names of its contributors
45 *    may be used to endorse or promote products derived from this software
46 *    without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 */
60
61#include <sys/cdefs.h>
62#if defined(LIBC_SCCS) && !defined(lint)
63__RCSID("$NetBSD: citrus_euc.c,v 1.12.6.1 2009/01/04 17:02:19 christos Exp $");
64#endif /* LIBC_SCCS and not lint */
65
66#include <assert.h>
67#include <errno.h>
68#include <string.h>
69#include <stdio.h>
70#include <stdlib.h>
71#include <stddef.h>
72#include <wchar.h>
73#include <sys/types.h>
74#include <limits.h>
75
76#include "citrus_namespace.h"
77#include "citrus_bcs.h"
78#include "citrus_types.h"
79#include "citrus_module.h"
80#include "citrus_ctype.h"
81#include "citrus_stdenc.h"
82#include "citrus_euc.h"
83
84
85/* ----------------------------------------------------------------------
86 * private stuffs used by templates
87 */
88
89typedef struct {
90	char ch[3];
91	int chlen;
92} _EUCState;
93
94typedef struct {
95	unsigned	count[4];
96	wchar_t		bits[4];
97	wchar_t		mask;
98	unsigned	mb_cur_max;
99} _EUCEncodingInfo;
100
101typedef struct {
102	_EUCEncodingInfo	ei;
103	struct {
104		/* for future multi-locale facility */
105		_EUCState	s_mblen;
106		_EUCState	s_mbrlen;
107		_EUCState	s_mbrtowc;
108		_EUCState	s_mbtowc;
109		_EUCState	s_mbsrtowcs;
110		_EUCState	s_wcrtomb;
111		_EUCState	s_wcsrtombs;
112		_EUCState	s_wctomb;
113	} states;
114} _EUCCTypeInfo;
115
116#define	_SS2	0x008e
117#define	_SS3	0x008f
118
119#define _CEI_TO_EI(_cei_)		(&(_cei_)->ei)
120#define _CEI_TO_STATE(_cei_, _func_)	(_cei_)->states.s_##_func_
121
122#define _FUNCNAME(m)			_citrus_EUC_##m
123#define _ENCODING_INFO			_EUCEncodingInfo
124#define _CTYPE_INFO			_EUCCTypeInfo
125#define _ENCODING_STATE			_EUCState
126#define _ENCODING_MB_CUR_MAX(_ei_)	(_ei_)->mb_cur_max
127#define _ENCODING_IS_STATE_DEPENDENT	0
128#define _STATE_NEEDS_EXPLICIT_INIT(_ps_)	0
129
130
131static __inline int
132_citrus_EUC_cs(unsigned int c)
133{
134	c &= 0xff;
135
136	return ((c & 0x80) ? c == _SS3 ? 3 : c == _SS2 ? 2 : 1 : 0);
137}
138
139static __inline int
140_citrus_EUC_parse_variable(_EUCEncodingInfo *ei,
141			   const void *var, size_t lenvar)
142{
143	const char *v, *e;
144	int x;
145
146	/* parse variable string */
147	if (!var)
148		return (EFTYPE);
149
150	v = (const char *) var;
151
152	while (*v == ' ' || *v == '\t')
153		++v;
154
155	ei->mb_cur_max = 1;
156	for (x = 0; x < 4; ++x) {
157		ei->count[x] = (int)_bcs_strtol(v, (char **)&e, 0);
158		if (v == e || !(v = e) || ei->count[x]<1 || ei->count[x]>4) {
159			return (EFTYPE);
160		}
161		if (ei->mb_cur_max < ei->count[x])
162			ei->mb_cur_max = ei->count[x];
163		while (*v == ' ' || *v == '\t')
164			++v;
165		ei->bits[x] = (int)_bcs_strtol(v, (char **)&e, 0);
166		if (v == e || !(v = e)) {
167			return (EFTYPE);
168		}
169		while (*v == ' ' || *v == '\t')
170			++v;
171	}
172	ei->mask = (int)_bcs_strtol(v, (char **)&e, 0);
173	if (v == e || !(v = e)) {
174		return (EFTYPE);
175	}
176
177	return 0;
178}
179
180
181static __inline void
182/*ARGSUSED*/
183_citrus_EUC_init_state(_EUCEncodingInfo *ei, _EUCState *s)
184{
185	memset(s, 0, sizeof(*s));
186}
187
188static __inline void
189/*ARGSUSED*/
190_citrus_EUC_pack_state(_EUCEncodingInfo *ei, void *pspriv, const _EUCState *s)
191{
192	memcpy(pspriv, (const void *)s, sizeof(*s));
193}
194
195static __inline void
196/*ARGSUSED*/
197_citrus_EUC_unpack_state(_EUCEncodingInfo *ei, _EUCState *s,
198			 const void *pspriv)
199{
200	memcpy((void *)s, pspriv, sizeof(*s));
201}
202
203static int
204_citrus_EUC_mbrtowc_priv(_EUCEncodingInfo *ei, wchar_t *pwc, const char **s,
205			 size_t n, _EUCState *psenc, size_t *nresult)
206{
207	wchar_t wchar;
208	int c, cs, len;
209	int chlenbak;
210	const char *s0, *s1 = NULL;
211
212	_DIAGASSERT(nresult != 0);
213	_DIAGASSERT(ei != NULL);
214	_DIAGASSERT(psenc != NULL);
215	_DIAGASSERT(s != NULL);
216
217	s0 = *s;
218
219	if (s0 == NULL) {
220		_citrus_EUC_init_state(ei, psenc);
221		*nresult = 0; /* state independent */
222		return (0);
223	}
224
225	chlenbak = psenc->chlen;
226
227	/* make sure we have the first byte in the buffer */
228	switch (psenc->chlen) {
229	case 0:
230		if (n < 1)
231			goto restart;
232		psenc->ch[0] = *s0++;
233		psenc->chlen = 1;
234		n--;
235		break;
236	case 1:
237	case 2:
238		break;
239	default:
240		/* illgeal state */
241		goto encoding_error;
242	}
243
244	c = ei->count[cs = _citrus_EUC_cs(psenc->ch[0] & 0xff)];
245	if (c == 0)
246		goto encoding_error;
247	while (psenc->chlen < c) {
248		if (n < 1)
249			goto restart;
250		psenc->ch[psenc->chlen] = *s0++;
251		psenc->chlen++;
252		n--;
253	}
254	*s = s0;
255
256	switch (cs) {
257	case 3:
258	case 2:
259		/* skip SS2/SS3 */
260		len = c - 1;
261		s1 = &psenc->ch[1];
262		break;
263	case 1:
264	case 0:
265		len = c;
266		s1 = &psenc->ch[0];
267		break;
268	default:
269		goto encoding_error;
270	}
271	wchar = 0;
272	while (len-- > 0)
273		wchar = (wchar << 8) | (*s1++ & 0xff);
274	wchar = (wchar & ~ei->mask) | ei->bits[cs];
275
276	psenc->chlen = 0;
277	if (pwc)
278		*pwc = wchar;
279
280	if (!wchar) {
281		*nresult = 0;
282	} else {
283		*nresult = (size_t)(c - chlenbak);
284	}
285
286	return 0;
287
288encoding_error:
289	psenc->chlen = 0;
290	*nresult = (size_t)-1;
291	return (EILSEQ);
292
293restart:
294	*nresult = (size_t)-2;
295	*s = s0;
296	return (0);
297}
298
299static int
300_citrus_EUC_wcrtomb_priv(_EUCEncodingInfo *ei, char *s, size_t n, wchar_t wc,
301			 _EUCState *psenc, size_t *nresult)
302{
303	wchar_t m, nm;
304	int cs, i, ret;
305
306	_DIAGASSERT(ei != NULL);
307	_DIAGASSERT(nresult != 0);
308	_DIAGASSERT(s != NULL);
309
310	m = wc & ei->mask;
311	nm = wc & ~m;
312
313	for (cs = 0;
314	     cs < sizeof(ei->count)/sizeof(ei->count[0]);
315	     cs++) {
316		if (m == ei->bits[cs])
317			break;
318	}
319	/* fallback case - not sure if it is necessary */
320	if (cs == sizeof(ei->count)/sizeof(ei->count[0]))
321		cs = 1;
322
323	i = ei->count[cs];
324	if (n < i) {
325		ret = E2BIG;
326		goto err;
327	}
328	m = (cs) ? 0x80 : 0x00;
329	switch (cs) {
330	case 2:
331		*s++ = _SS2;
332		i--;
333		break;
334	case 3:
335		*s++ = _SS3;
336		i--;
337		break;
338	}
339
340	while (i-- > 0)
341		*s++ = ((nm >> (i << 3)) & 0xff) | m;
342
343	*nresult = (size_t)ei->count[cs];
344	return 0;
345
346err:
347	*nresult = (size_t)-1;
348	return ret;
349}
350
351static __inline int
352/*ARGSUSED*/
353_citrus_EUC_stdenc_wctocs(_EUCEncodingInfo * __restrict ei,
354			  _csid_t * __restrict csid,
355			  _index_t * __restrict idx, wchar_t wc)
356{
357	wchar_t m, nm;
358
359	_DIAGASSERT(ei != NULL && csid != NULL && idx != NULL);
360
361	m = wc & ei->mask;
362	nm = wc & ~m;
363
364	*csid = (_citrus_csid_t)m;
365	*idx  = (_citrus_index_t)nm;
366
367	return (0);
368}
369
370static __inline int
371/*ARGSUSED*/
372_citrus_EUC_stdenc_cstowc(_EUCEncodingInfo * __restrict ei,
373			  wchar_t * __restrict wc,
374			  _csid_t csid, _index_t idx)
375{
376
377	_DIAGASSERT(ei != NULL && wc != NULL);
378
379	if ((csid & ~ei->mask) != 0 || (idx & ei->mask) != 0)
380		return (EINVAL);
381
382	*wc = (wchar_t)csid | (wchar_t)idx;
383
384	return (0);
385}
386
387static __inline int
388/*ARGSUSED*/
389_citrus_EUC_stdenc_get_state_desc_generic(_EUCEncodingInfo * __restrict ei,
390					  _EUCState * __restrict psenc,
391					  int * __restrict rstate)
392{
393
394	if (psenc->chlen == 0)
395		*rstate = _STDENC_SDGEN_INITIAL;
396	else
397		*rstate = _STDENC_SDGEN_INCOMPLETE_CHAR;
398
399	return 0;
400}
401
402static int
403/*ARGSUSED*/
404_citrus_EUC_encoding_module_init(_EUCEncodingInfo * __restrict ei,
405				 const void * __restrict var, size_t lenvar)
406{
407
408	_DIAGASSERT(ei != NULL);
409
410	return (_citrus_EUC_parse_variable(ei, var, lenvar));
411}
412
413static void
414/*ARGSUSED*/
415_citrus_EUC_encoding_module_uninit(_EUCEncodingInfo * __restrict ei)
416{
417}
418
419/* ----------------------------------------------------------------------
420 * public interface for ctype
421 */
422
423_CITRUS_CTYPE_DECLS(EUC);
424_CITRUS_CTYPE_DEF_OPS(EUC);
425
426#include "citrus_ctype_template.h"
427
428/* ----------------------------------------------------------------------
429 * public interface for stdenc
430 */
431
432_CITRUS_STDENC_DECLS(EUC);
433_CITRUS_STDENC_DEF_OPS(EUC);
434
435#include "citrus_stdenc_template.h"
436