1 /* $FreeBSD: head/lib/libiconv_modules/ISO2022/citrus_iso2022.c 281550 2015-04-15 09:09:20Z tijl $ */
2 /*	$NetBSD: citrus_iso2022.c,v 1.20 2010/12/07 22:01:45 joerg Exp $	*/
3 
4 /*-
5  * Copyright (c)1999, 2002 Citrus Project,
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  *	$Citrus: xpg4dl/FreeBSD/lib/libc/locale/iso2022.c,v 1.23 2001/06/21 01:51:44 yamt Exp $
30  */
31 
32 #include <sys/cdefs.h>
33 #include <sys/types.h>
34 
35 #include <assert.h>
36 #include <errno.h>
37 #include <limits.h>
38 #include <stdbool.h>
39 #include <stddef.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <wchar.h>
44 
45 #include "citrus_namespace.h"
46 #include "citrus_types.h"
47 #include "citrus_module.h"
48 #include "citrus_stdenc.h"
49 #include "citrus_iso2022.h"
50 
51 
52 /* ----------------------------------------------------------------------
53  * private stuffs used by templates
54  */
55 
56 
57 /*
58  * wchar_t mappings:
59  * ASCII (ESC ( B)		00000000 00000000 00000000 0xxxxxxx
60  * iso-8859-1 (ESC , A)		00000000 00000000 00000000 1xxxxxxx
61  * 94 charset (ESC ( F)		0fffffff 00000000 00000000 0xxxxxxx
62  * 94 charset (ESC ( M F)	0fffffff 1mmmmmmm 00000000 0xxxxxxx
63  * 96 charset (ESC , F)		0fffffff 00000000 00000000 1xxxxxxx
64  * 96 charset (ESC , M F)	0fffffff 1mmmmmmm 00000000 1xxxxxxx
65  * 94x94 charset (ESC $ ( F)	0fffffff 00000000 0xxxxxxx 0xxxxxxx
66  * 96x96 charset (ESC $ , F)	0fffffff 00000000 0xxxxxxx 1xxxxxxx
67  * 94x94 charset (ESC & V ESC $ ( F)
68  *				0fffffff 1vvvvvvv 0xxxxxxx 0xxxxxxx
69  * 94x94x94 charset (ESC $ ( F)	0fffffff 0xxxxxxx 0xxxxxxx 0xxxxxxx
70  * 96x96x96 charset (ESC $ , F)	0fffffff 0xxxxxxx 0xxxxxxx 1xxxxxxx
71  * reserved for UCS4 co-existence (UCS4 is 31bit encoding thanks to mohta bit)
72  *				1xxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx
73  */
74 
75 #define CS94		(0U)
76 #define CS96		(1U)
77 #define CS94MULTI	(2U)
78 #define CS96MULTI	(3U)
79 
80 typedef struct {
81 	unsigned char	 type;
82 	unsigned char	 final;
83 	unsigned char	 interm;
84 	unsigned char	 vers;
85 } _ISO2022Charset;
86 
87 static const _ISO2022Charset ascii    = { CS94, 'B', '\0', '\0' };
88 static const _ISO2022Charset iso88591 = { CS96, 'A', '\0', '\0' };
89 
90 typedef struct {
91 	_ISO2022Charset	g[4];
92 	/* need 3 bits to hold -1, 0, ..., 3 */
93 	int	gl:3,
94 		gr:3,
95 		singlegl:3,
96 		singlegr:3;
97 	char ch[7];	/* longest escape sequence (ESC & V ESC $ ( F) */
98 	size_t chlen;
99 	int flags;
100 #define _ISO2022STATE_FLAG_INITIALIZED	1
101 } _ISO2022State;
102 
103 typedef struct {
104 	_ISO2022Charset	*recommend[4];
105 	size_t	recommendsize[4];
106 	_ISO2022Charset	initg[4];
107 	int	maxcharset;
108 	int	flags;
109 #define	F_8BIT	0x0001
110 #define	F_NOOLD	0x0002
111 #define	F_SI	0x0010	/*0F*/
112 #define	F_SO	0x0020	/*0E*/
113 #define	F_LS0	0x0010	/*0F*/
114 #define	F_LS1	0x0020	/*0E*/
115 #define	F_LS2	0x0040	/*ESC n*/
116 #define	F_LS3	0x0080	/*ESC o*/
117 #define	F_LS1R	0x0100	/*ESC ~*/
118 #define	F_LS2R	0x0200	/*ESC }*/
119 #define	F_LS3R	0x0400	/*ESC |*/
120 #define	F_SS2	0x0800	/*ESC N*/
121 #define	F_SS3	0x1000	/*ESC O*/
122 #define	F_SS2R	0x2000	/*8E*/
123 #define	F_SS3R	0x4000	/*8F*/
124 } _ISO2022EncodingInfo;
125 
126 #define _CEI_TO_EI(_cei_)		(&(_cei_)->ei)
127 #define _CEI_TO_STATE(_cei_, _func_)	(_cei_)->states.s_##_func_
128 
129 #define _FUNCNAME(m)			_citrus_ISO2022_##m
130 #define _ENCODING_INFO			_ISO2022EncodingInfo
131 #define _ENCODING_STATE			_ISO2022State
132 #define _ENCODING_MB_CUR_MAX(_ei_)	MB_LEN_MAX
133 #define _ENCODING_IS_STATE_DEPENDENT	1
134 #define _STATE_NEEDS_EXPLICIT_INIT(_ps_)	\
135     (!((_ps_)->flags & _ISO2022STATE_FLAG_INITIALIZED))
136 
137 
138 #define _ISO2022INVALID (wchar_t)-1
139 
140 static __inline bool isc0(__uint8_t x)
141 {
142 
143 	return ((x & 0x1f) == x);
144 }
145 
146 static __inline bool isc1(__uint8_t x)
147 {
148 
149 	return (0x80 <= x && x <= 0x9f);
150 }
151 
152 static __inline bool iscntl(__uint8_t x)
153 {
154 
155 	return (isc0(x) || isc1(x) || x == 0x7f);
156 }
157 
158 static __inline bool is94(__uint8_t x)
159 {
160 
161 	return (0x21 <= x && x <= 0x7e);
162 }
163 
164 static __inline bool is96(__uint8_t x)
165 {
166 
167 	return (0x20 <= x && x <= 0x7f);
168 }
169 
170 static __inline bool isecma(__uint8_t x)
171 {
172 
173 	return (0x30 <= x && x <= 0x7f);
174 }
175 
176 static __inline bool isinterm(__uint8_t x)
177 {
178 
179 	return (0x20 <= x && x <= 0x2f);
180 }
181 
182 static __inline bool isthree(__uint8_t x)
183 {
184 
185 	return (0x60 <= x && x <= 0x6f);
186 }
187 
188 static __inline int
189 getcs(const char * __restrict p, _ISO2022Charset * __restrict cs)
190 {
191 
192 	if (!strncmp(p, "94$", 3) && p[3] && !p[4]) {
193 		cs->final = (unsigned char)(p[3] & 0xff);
194 		cs->interm = '\0';
195 		cs->vers = '\0';
196 		cs->type = CS94MULTI;
197 	} else if (!strncmp(p, "96$", 3) && p[3] && !p[4]) {
198 		cs->final = (unsigned char)(p[3] & 0xff);
199 		cs->interm = '\0';
200 		cs->vers = '\0';
201 		cs->type = CS96MULTI;
202 	} else if (!strncmp(p, "94", 2) && p[2] && !p[3]) {
203 		cs->final = (unsigned char)(p[2] & 0xff);
204 		cs->interm = '\0';
205 		cs->vers = '\0';
206 		cs->type = CS94;
207 	} else if (!strncmp(p, "96", 2) && p[2] && !p[3]) {
208 		cs->final = (unsigned char )(p[2] & 0xff);
209 		cs->interm = '\0';
210 		cs->vers = '\0';
211 		cs->type = CS96;
212 	} else
213 		return (1);
214 
215 	return (0);
216 }
217 
218 
219 #define _NOTMATCH	0
220 #define _MATCH		1
221 #define _PARSEFAIL	2
222 
223 static __inline int
224 get_recommend(_ISO2022EncodingInfo * __restrict ei,
225     const char * __restrict token)
226 {
227 	_ISO2022Charset cs, *p;
228 	int i;
229 
230 	if (!strchr("0123", token[0]) || token[1] != '=')
231 		return (_NOTMATCH);
232 
233 	if (getcs(&token[2], &cs) == 0)
234 		;
235 	else if (!strcmp(&token[2], "94")) {
236 		cs.final = (unsigned char)(token[4]);
237 		cs.interm = '\0';
238 		cs.vers = '\0';
239 		cs.type = CS94;
240 	} else if (!strcmp(&token[2], "96")) {
241 		cs.final = (unsigned char)(token[4]);
242 		cs.interm = '\0';
243 		cs.vers = '\0';
244 		cs.type = CS96;
245 	} else if (!strcmp(&token[2], "94$")) {
246 		cs.final = (unsigned char)(token[5]);
247 		cs.interm = '\0';
248 		cs.vers = '\0';
249 		cs.type = CS94MULTI;
250 	} else if (!strcmp(&token[2], "96$")) {
251 		cs.final = (unsigned char)(token[5]);
252 		cs.interm = '\0';
253 		cs.vers = '\0';
254 		cs.type = CS96MULTI;
255 	} else
256 		return (_PARSEFAIL);
257 
258 	i = token[0] - '0';
259 	if (!ei->recommend[i])
260 		ei->recommend[i] = malloc(sizeof(_ISO2022Charset));
261 	else {
262 		p = realloc(ei->recommend[i],
263 		    sizeof(_ISO2022Charset) * (ei->recommendsize[i] + 1));
264 		if (!p)
265 			return (_PARSEFAIL);
266 		ei->recommend[i] = p;
267 	}
268 	if (!ei->recommend[i])
269 		return (_PARSEFAIL);
270 	ei->recommendsize[i]++;
271 
272 	(ei->recommend[i] + (ei->recommendsize[i] - 1))->final = cs.final;
273 	(ei->recommend[i] + (ei->recommendsize[i] - 1))->interm = cs.interm;
274 	(ei->recommend[i] + (ei->recommendsize[i] - 1))->vers = cs.vers;
275 	(ei->recommend[i] + (ei->recommendsize[i] - 1))->type = cs.type;
276 
277 	return (_MATCH);
278 }
279 
280 static __inline int
281 get_initg(_ISO2022EncodingInfo * __restrict ei,
282     const char * __restrict token)
283 {
284 	_ISO2022Charset cs;
285 
286 	if (strncmp("INIT", &token[0], 4) ||
287 	    !strchr("0123", token[4]) ||
288 	    token[5] != '=')
289 		return (_NOTMATCH);
290 
291 	if (getcs(&token[6], &cs) != 0)
292 		return (_PARSEFAIL);
293 
294 	ei->initg[token[4] - '0'].type = cs.type;
295 	ei->initg[token[4] - '0'].final = cs.final;
296 	ei->initg[token[4] - '0'].interm = cs.interm;
297 	ei->initg[token[4] - '0'].vers = cs.vers;
298 
299 	return (_MATCH);
300 }
301 
302 static __inline int
303 get_max(_ISO2022EncodingInfo * __restrict ei,
304     const char * __restrict token)
305 {
306 	if (!strcmp(token, "MAX1"))
307 		ei->maxcharset = 1;
308 	else if (!strcmp(token, "MAX2"))
309 		ei->maxcharset = 2;
310 	else if (!strcmp(token, "MAX3"))
311 		ei->maxcharset = 3;
312 	else
313 		return (_NOTMATCH);
314 
315 	return (_MATCH);
316 }
317 
318 
319 static __inline int
320 get_flags(_ISO2022EncodingInfo * __restrict ei,
321     const char * __restrict token)
322 {
323 	static struct {
324 		const char	*tag;
325 		int		flag;
326 	} const tags[] = {
327 		{ "DUMMY",	0	},
328 		{ "8BIT",	F_8BIT	},
329 		{ "NOOLD",	F_NOOLD	},
330 		{ "SI",		F_SI	},
331 		{ "SO",		F_SO	},
332 		{ "LS0",	F_LS0	},
333 		{ "LS1",	F_LS1	},
334 		{ "LS2",	F_LS2	},
335 		{ "LS3",	F_LS3	},
336 		{ "LS1R",	F_LS1R	},
337 		{ "LS2R",	F_LS2R	},
338 		{ "LS3R",	F_LS3R	},
339 		{ "SS2",	F_SS2	},
340 		{ "SS3",	F_SS3	},
341 		{ "SS2R",	F_SS2R	},
342 		{ "SS3R",	F_SS3R	},
343 		{ NULL,		0 }
344 	};
345 	int i;
346 
347 	for (i = 0; tags[i].tag; i++)
348 		if (!strcmp(token, tags[i].tag)) {
349 			ei->flags |= tags[i].flag;
350 			return (_MATCH);
351 		}
352 
353 	return (_NOTMATCH);
354 }
355 
356 
357 static __inline int
358 _citrus_ISO2022_parse_variable(_ISO2022EncodingInfo * __restrict ei,
359     const void * __restrict var, size_t lenvar __unused)
360 {
361 	char const *e, *v;
362 	char buf[20];
363 	size_t len;
364 	int i, ret;
365 
366 	/*
367 	 * parse VARIABLE section.
368 	 */
369 
370 	if (!var)
371 		return (EFTYPE);
372 
373 	v = (const char *) var;
374 
375 	/* initialize structure */
376 	ei->maxcharset = 0;
377 	for (i = 0; i < 4; i++) {
378 		ei->recommend[i] = NULL;
379 		ei->recommendsize[i] = 0;
380 	}
381 	ei->flags = 0;
382 
383 	while (*v) {
384 		while (*v == ' ' || *v == '\t')
385 			++v;
386 
387 		/* find the token */
388 		e = v;
389 		while (*e && *e != ' ' && *e != '\t')
390 			++e;
391 
392 		len = e - v;
393 		if (len == 0)
394 			break;
395 		if (len >= sizeof(buf))
396 			goto parsefail;
397 		snprintf(buf, sizeof(buf), "%.*s", (int)len, v);
398 
399 		if ((ret = get_recommend(ei, buf)) != _NOTMATCH)
400 			;
401 		else if ((ret = get_initg(ei, buf)) != _NOTMATCH)
402 			;
403 		else if ((ret = get_max(ei, buf)) != _NOTMATCH)
404 			;
405 		else if ((ret = get_flags(ei, buf)) != _NOTMATCH)
406 			;
407 		else
408 			ret = _PARSEFAIL;
409 		if (ret == _PARSEFAIL)
410 			goto parsefail;
411 		v = e;
412 
413 	}
414 
415 	return (0);
416 
417 parsefail:
418 	free(ei->recommend[0]);
419 	free(ei->recommend[1]);
420 	free(ei->recommend[2]);
421 	free(ei->recommend[3]);
422 
423 	return (EFTYPE);
424 }
425 
426 static __inline void
427 /*ARGSUSED*/
428 _citrus_ISO2022_init_state(_ISO2022EncodingInfo * __restrict ei,
429     _ISO2022State * __restrict s)
430 {
431 	int i;
432 
433 	memset(s, 0, sizeof(*s));
434 	s->gl = 0;
435 	s->gr = (ei->flags & F_8BIT) ? 1 : -1;
436 
437 	for (i = 0; i < 4; i++)
438 		if (ei->initg[i].final) {
439 			s->g[i].type = ei->initg[i].type;
440 			s->g[i].final = ei->initg[i].final;
441 			s->g[i].interm = ei->initg[i].interm;
442 		}
443 	s->singlegl = s->singlegr = -1;
444 	s->flags |= _ISO2022STATE_FLAG_INITIALIZED;
445 }
446 
447 #if 0
448 static __inline void
449 /*ARGSUSED*/
450 _citrus_ISO2022_pack_state(_ISO2022EncodingInfo * __restrict ei __unused,
451     void * __restrict pspriv, const _ISO2022State * __restrict s)
452 {
453 
454 	memcpy(pspriv, (const void *)s, sizeof(*s));
455 }
456 
457 static __inline void
458 /*ARGSUSED*/
459 _citrus_ISO2022_unpack_state(_ISO2022EncodingInfo * __restrict ei __unused,
460     _ISO2022State * __restrict s, const void * __restrict pspriv)
461 {
462 
463 	memcpy((void *)s, pspriv, sizeof(*s));
464 }
465 #endif
466 
467 static int
468 /*ARGSUSED*/
469 _citrus_ISO2022_encoding_module_init(_ISO2022EncodingInfo * __restrict ei,
470     const void * __restrict var, size_t lenvar)
471 {
472 
473 	return (_citrus_ISO2022_parse_variable(ei, var, lenvar));
474 }
475 
476 static void
477 /*ARGSUSED*/
478 _citrus_ISO2022_encoding_module_uninit(_ISO2022EncodingInfo *ei __unused)
479 {
480 
481 }
482 
483 #define	ESC	'\033'
484 #define	ECMA	-1
485 #define	INTERM	-2
486 #define	OECMA	-3
487 static const struct seqtable {
488 	int type;
489 	int csoff;
490 	int finaloff;
491 	int intermoff;
492 	int versoff;
493 	int len;
494 	int chars[10];
495 } seqtable[] = {
496 	/* G0 94MULTI special */
497 	{ CS94MULTI, -1, 2, -1, -1,	3, { ESC, '$', OECMA }, },
498 	/* G0 94MULTI special with version identification */
499 	{ CS94MULTI, -1, 5, -1, 2,	6, { ESC, '&', ECMA, ESC, '$', OECMA }, },
500 	/* G? 94 */
501 	{ CS94, 1, 2, -1, -1,		3, { ESC, CS94, ECMA, }, },
502 	/* G? 94 with 2nd intermediate char */
503 	{ CS94, 1, 3, 2, -1,		4, { ESC, CS94, INTERM, ECMA, }, },
504 	/* G? 96 */
505 	{ CS96, 1, 2, -1, -1,		3, { ESC, CS96, ECMA, }, },
506 	/* G? 96 with 2nd intermediate char */
507 	{ CS96, 1, 3, 2, -1,		4, { ESC, CS96, INTERM, ECMA, }, },
508 	/* G? 94MULTI */
509 	{ CS94MULTI, 2, 3, -1, -1,	4, { ESC, '$', CS94, ECMA, }, },
510 	/* G? 96MULTI */
511 	{ CS96MULTI, 2, 3, -1, -1,	4, { ESC, '$', CS96, ECMA, }, },
512 	/* G? 94MULTI with version specification */
513 	{ CS94MULTI, 5, 6, -1, 2,	7, { ESC, '&', ECMA, ESC, '$', CS94, ECMA, }, },
514 	/* LS2/3 */
515 	{ -1, -1, -1, -1, -1,		2, { ESC, 'n', }, },
516 	{ -1, -1, -1, -1, -1,		2, { ESC, 'o', }, },
517 	/* LS1/2/3R */
518 	{ -1, -1, -1, -1, -1,		2, { ESC, '~', }, },
519 	{ -1, -1, -1, -1, -1,		2, { ESC, /*{*/ '}', }, },
520 	{ -1, -1, -1, -1, -1,		2, { ESC, '|', }, },
521 	/* SS2/3 */
522 	{ -1, -1, -1, -1, -1,		2, { ESC, 'N', }, },
523 	{ -1, -1, -1, -1, -1,		2, { ESC, 'O', }, },
524 	/* end of records */
525 //	{ 0, }
526 	{  0,  0,  0,  0,  0,		0, { ESC,  0, }, }
527 };
528 
529 static int
530 seqmatch(const char * __restrict s, size_t n,
531     const struct seqtable * __restrict sp)
532 {
533 	const int *p;
534 
535 	p = sp->chars;
536 	while ((size_t)(p - sp->chars) < n && p - sp->chars < sp->len) {
537 		switch (*p) {
538 		case ECMA:
539 			if (!isecma(*s))
540 				goto terminate;
541 			break;
542 		case OECMA:
543 			if (*s && strchr("@AB", *s))
544 				break;
545 			else
546 				goto terminate;
547 		case INTERM:
548 			if (!isinterm(*s))
549 				goto terminate;
550 			break;
551 		case CS94:
552 			if (*s && strchr("()*+", *s))
553 				break;
554 			else
555 				goto terminate;
556 		case CS96:
557 			if (*s && strchr(",-./", *s))
558 				break;
559 			else
560 				goto terminate;
561 		default:
562 			if (*s != *p)
563 				goto terminate;
564 			break;
565 		}
566 
567 		p++;
568 		s++;
569 	}
570 
571 terminate:
572 	return (p - sp->chars);
573 }
574 
575 static wchar_t
576 _ISO2022_sgetwchar(_ISO2022EncodingInfo * __restrict ei __unused,
577     char * __restrict string, size_t n, char ** __restrict result,
578     _ISO2022State * __restrict psenc)
579 {
580 	const struct seqtable *sp;
581 	wchar_t wchar = 0;
582 	int i, cur, nmatch;
583 
584 	while (1) {
585 		/* SI/SO */
586 		if (1 <= n && string[0] == '\017') {
587 			psenc->gl = 0;
588 			string++;
589 			n--;
590 			continue;
591 		}
592 		if (1 <= n && string[0] == '\016') {
593 			psenc->gl = 1;
594 			string++;
595 			n--;
596 			continue;
597 		}
598 
599 		/* SS2/3R */
600 		if (1 <= n && string[0] && strchr("\217\216", string[0])) {
601 			psenc->singlegl = psenc->singlegr =
602 			    (string[0] - '\216') + 2;
603 			string++;
604 			n--;
605 			continue;
606 		}
607 
608 		/* eat the letter if this is not ESC */
609 		if (1 <= n && string[0] != '\033')
610 			break;
611 
612 		/* look for a perfect match from escape sequences */
613 		for (sp = &seqtable[0]; sp->len; sp++) {
614 			nmatch = seqmatch(string, n, sp);
615 			if (sp->len == nmatch && n >= (size_t)(sp->len))
616 				break;
617 		}
618 
619 		if (!sp->len)
620 			goto notseq;
621 
622 		if (sp->type != -1) {
623 			if (sp->csoff == -1)
624 				i = 0;
625 			else {
626 				switch (sp->type) {
627 				case CS94:
628 				case CS94MULTI:
629 					i = string[sp->csoff] - '(';
630 					break;
631 				case CS96:
632 				case CS96MULTI:
633 					i = string[sp->csoff] - ',';
634 					break;
635 				default:
636 					return (_ISO2022INVALID);
637 				}
638 			}
639 			psenc->g[i].type = sp->type;
640 			psenc->g[i].final = '\0';
641 			psenc->g[i].interm = '\0';
642 			psenc->g[i].vers = '\0';
643 			/* sp->finaloff must not be -1 */
644 			if (sp->finaloff != -1)
645 				psenc->g[i].final = string[sp->finaloff];
646 			if (sp->intermoff != -1)
647 				psenc->g[i].interm = string[sp->intermoff];
648 			if (sp->versoff != -1)
649 				psenc->g[i].vers = string[sp->versoff];
650 
651 			string += sp->len;
652 			n -= sp->len;
653 			continue;
654 		}
655 
656 		/* LS2/3 */
657 		if (2 <= n && string[0] == '\033' &&
658 		    string[1] && strchr("no", string[1])) {
659 			psenc->gl = string[1] - 'n' + 2;
660 			string += 2;
661 			n -= 2;
662 			continue;
663 		}
664 
665 		/* LS1/2/3R */
666 			/* XXX: { for vi showmatch */
667 		if (2 <= n && string[0] == '\033' &&
668 		    string[1] && strchr("~}|", string[1])) {
669 			psenc->gr = 3 - (string[1] - '|');
670 			string += 2;
671 			n -= 2;
672 			continue;
673 		}
674 
675 		/* SS2/3 */
676 		if (2 <= n && string[0] == '\033' && string[1] &&
677 		    strchr("NO", string[1])) {
678 			psenc->singlegl = (string[1] - 'N') + 2;
679 			string += 2;
680 			n -= 2;
681 			continue;
682 		}
683 
684 	notseq:
685 		/*
686 		 * if we've got an unknown escape sequence, eat the ESC at the
687 		 * head.  otherwise, wait till full escape sequence comes.
688 		 */
689 		for (sp = &seqtable[0]; sp->len; sp++) {
690 			nmatch = seqmatch(string, n, sp);
691 			if (!nmatch)
692 				continue;
693 
694 			/*
695 			 * if we are in the middle of escape sequence,
696 			 * we still need to wait for more characters to come
697 			 */
698 			if (n < (size_t)(sp->len)) {
699 				if ((size_t)(nmatch) == n) {
700 					if (result)
701 						*result = string;
702 					return (_ISO2022INVALID);
703 				}
704 			} else {
705 				if (nmatch == sp->len) {
706 					/* this case should not happen */
707 					goto eat;
708 				}
709 			}
710 		}
711 
712 		break;
713 	}
714 
715 eat:
716 	/* no letter to eat */
717 	if (n < 1) {
718 		if (result)
719 			*result = string;
720 		return (_ISO2022INVALID);
721 	}
722 
723 	/* normal chars.  always eat C0/C1 as is. */
724 	if (iscntl(*string & 0xff))
725 		cur = -1;
726 	else if (*string & 0x80)
727 		cur = (psenc->singlegr == -1) ? psenc->gr : psenc->singlegr;
728 	else
729 		cur = (psenc->singlegl == -1) ? psenc->gl : psenc->singlegl;
730 
731 	if (cur == -1) {
732 asis:
733 		wchar = *string++ & 0xff;
734 		if (result)
735 			*result = string;
736 		/* reset single shift state */
737 		psenc->singlegr = psenc->singlegl = -1;
738 		return (wchar);
739 	}
740 
741 	/* length error check */
742 	switch (psenc->g[cur].type) {
743 	case CS94MULTI:
744 	case CS96MULTI:
745 		if (!isthree(psenc->g[cur].final)) {
746 			if (2 <= n &&
747 			    (string[0] & 0x80) == (string[1] & 0x80))
748 				break;
749 		} else {
750 			if (3 <= n &&
751 			    (string[0] & 0x80) == (string[1] & 0x80) &&
752 			    (string[0] & 0x80) == (string[2] & 0x80))
753 				break;
754 		}
755 
756 		/* we still need to wait for more characters to come */
757 		if (result)
758 			*result = string;
759 		return (_ISO2022INVALID);
760 
761 	case CS94:
762 	case CS96:
763 		if (1 <= n)
764 			break;
765 
766 		/* we still need to wait for more characters to come */
767 		if (result)
768 			*result = string;
769 		return (_ISO2022INVALID);
770 	}
771 
772 	/* range check */
773 	switch (psenc->g[cur].type) {
774 	case CS94:
775 		if (!(is94(string[0] & 0x7f)))
776 			goto asis;
777 	case CS96:
778 		if (!(is96(string[0] & 0x7f)))
779 			goto asis;
780 		break;
781 	case CS94MULTI:
782 		if (!(is94(string[0] & 0x7f) && is94(string[1] & 0x7f)))
783 			goto asis;
784 		break;
785 	case CS96MULTI:
786 		if (!(is96(string[0] & 0x7f) && is96(string[1] & 0x7f)))
787 			goto asis;
788 		break;
789 	}
790 
791 	/* extract the character. */
792 	switch (psenc->g[cur].type) {
793 	case CS94:
794 		/* special case for ASCII. */
795 		if (psenc->g[cur].final == 'B' && !psenc->g[cur].interm) {
796 			wchar = *string++;
797 			wchar &= 0x7f;
798 			break;
799 		}
800 		wchar = psenc->g[cur].final;
801 		wchar = (wchar << 8);
802 		wchar |= (psenc->g[cur].interm ? (0x80 | psenc->g[cur].interm) : 0);
803 		wchar = (wchar << 8);
804 		wchar = (wchar << 8) | (*string++ & 0x7f);
805 		break;
806 	case CS96:
807 		/* special case for ISO-8859-1. */
808 		if (psenc->g[cur].final == 'A' && !psenc->g[cur].interm) {
809 			wchar = *string++;
810 			wchar &= 0x7f;
811 			wchar |= 0x80;
812 			break;
813 		}
814 		wchar = psenc->g[cur].final;
815 		wchar = (wchar << 8);
816 		wchar |= (psenc->g[cur].interm ? (0x80 | psenc->g[cur].interm) : 0);
817 		wchar = (wchar << 8);
818 		wchar = (wchar << 8) | (*string++ & 0x7f);
819 		wchar |= 0x80;
820 		break;
821 	case CS94MULTI:
822 	case CS96MULTI:
823 		wchar = psenc->g[cur].final;
824 		wchar = (wchar << 8);
825 		if (isthree(psenc->g[cur].final))
826 			wchar |= (*string++ & 0x7f);
827 		wchar = (wchar << 8) | (*string++ & 0x7f);
828 		wchar = (wchar << 8) | (*string++ & 0x7f);
829 		if (psenc->g[cur].type == CS96MULTI)
830 			wchar |= 0x80;
831 		break;
832 	}
833 
834 	if (result)
835 		*result = string;
836 	/* reset single shift state */
837 	psenc->singlegr = psenc->singlegl = -1;
838 	return (wchar);
839 }
840 
841 
842 
843 static int
844 _citrus_ISO2022_mbrtowc_priv(_ISO2022EncodingInfo * __restrict ei,
845     wchar_t * __restrict pwc, char ** __restrict s,
846     size_t n, _ISO2022State * __restrict psenc, size_t * __restrict nresult)
847 {
848 	char *p, *result, *s0;
849 	wchar_t wchar;
850 	int c, chlenbak;
851 
852 	if (*s == NULL) {
853 		_citrus_ISO2022_init_state(ei, psenc);
854 		*nresult = _ENCODING_IS_STATE_DEPENDENT;
855 		return (0);
856 	}
857 	s0 = *s;
858 	c = 0;
859 	chlenbak = psenc->chlen;
860 
861 	/*
862 	 * if we have something in buffer, use that.
863 	 * otherwise, skip here
864 	 */
865 	if (psenc->chlen > sizeof(psenc->ch)) {
866 		/* illgeal state */
867 		_citrus_ISO2022_init_state(ei, psenc);
868 		goto encoding_error;
869 	}
870 	if (psenc->chlen == 0)
871 		goto emptybuf;
872 
873 	/* buffer is not empty */
874 	p = psenc->ch;
875 	while (psenc->chlen < sizeof(psenc->ch)) {
876 		if (n > 0) {
877 			psenc->ch[psenc->chlen++] = *s0++;
878 			n--;
879 		}
880 
881 		wchar = _ISO2022_sgetwchar(ei, p, psenc->chlen - (p-psenc->ch),
882 		    &result, psenc);
883 		c += result - p;
884 		if (wchar != _ISO2022INVALID) {
885 			if (psenc->chlen > (size_t)c)
886 				memmove(psenc->ch, result, psenc->chlen - c);
887 			if (psenc->chlen < (size_t)c)
888 				psenc->chlen = 0;
889 			else
890 				psenc->chlen -= c;
891 			goto output;
892 		}
893 
894 		if (n == 0) {
895 			if ((size_t)(result - p) == psenc->chlen)
896 				/* complete shift sequence. */
897 				psenc->chlen = 0;
898 			goto restart;
899 		}
900 
901 		p = result;
902 	}
903 
904 	/* escape sequence too long? */
905 	goto encoding_error;
906 
907 emptybuf:
908 	wchar = _ISO2022_sgetwchar(ei, s0, n, &result, psenc);
909 	if (wchar != _ISO2022INVALID) {
910 		c += result - s0;
911 		psenc->chlen = 0;
912 		s0 = result;
913 		goto output;
914 	}
915 	if (result > s0) {
916 		c += (result - s0);
917 		n -= (result - s0);
918 		s0 = result;
919 		if (n > 0)
920 			goto emptybuf;
921 		/* complete shift sequence. */
922 		goto restart;
923 	}
924 	n += c;
925 	if (n < sizeof(psenc->ch)) {
926 		memcpy(psenc->ch, s0 - c, n);
927 		psenc->chlen = n;
928 		s0 = result;
929 		goto restart;
930 	}
931 
932 	/* escape sequence too long? */
933 
934 encoding_error:
935 	psenc->chlen = 0;
936 	*nresult = (size_t)-1;
937 	return (EILSEQ);
938 
939 output:
940 	*s = s0;
941 	if (pwc)
942 		*pwc = wchar;
943 	*nresult = wchar ? c - chlenbak : 0;
944 	return (0);
945 
946 restart:
947 	*s = s0;
948 	*nresult = (size_t)-2;
949 
950 	return (0);
951 }
952 
953 static int
954 recommendation(_ISO2022EncodingInfo * __restrict ei,
955     _ISO2022Charset * __restrict cs)
956 {
957 	_ISO2022Charset *recommend;
958 	size_t j;
959 	int i;
960 
961 	/* first, try a exact match. */
962 	for (i = 0; i < 4; i++) {
963 		recommend = ei->recommend[i];
964 		for (j = 0; j < ei->recommendsize[i]; j++) {
965 			if (cs->type != recommend[j].type)
966 				continue;
967 			if (cs->final != recommend[j].final)
968 				continue;
969 			if (cs->interm != recommend[j].interm)
970 				continue;
971 
972 			return (i);
973 		}
974 	}
975 
976 	/* then, try a wildcard match over final char. */
977 	for (i = 0; i < 4; i++) {
978 		recommend = ei->recommend[i];
979 		for (j = 0; j < ei->recommendsize[i]; j++) {
980 			if (cs->type != recommend[j].type)
981 				continue;
982 			if (cs->final && (cs->final != recommend[j].final))
983 				continue;
984 			if (cs->interm && (cs->interm != recommend[j].interm))
985 				continue;
986 
987 			return (i);
988 		}
989 	}
990 
991 	/* there's no recommendation. make a guess. */
992 	if (ei->maxcharset == 0) {
993 		return (0);
994 	} else {
995 		switch (cs->type) {
996 		case CS94:
997 		case CS94MULTI:
998 			return (0);
999 		case CS96:
1000 		case CS96MULTI:
1001 			return (1);
1002 		}
1003 	}
1004 	return (0);
1005 }
1006 
1007 static int
1008 _ISO2022_sputwchar(_ISO2022EncodingInfo * __restrict ei, wchar_t wc,
1009     char * __restrict string, size_t n, char ** __restrict result,
1010     _ISO2022State * __restrict psenc, size_t * __restrict nresult)
1011 {
1012 	_ISO2022Charset cs;
1013 	char *p;
1014 	char tmp[MB_LEN_MAX];
1015 	size_t len;
1016 	int bit8, i = 0, target;
1017 	unsigned char mask;
1018 
1019 	if (isc0(wc & 0xff)) {
1020 		/* go back to INIT0 or ASCII on control chars */
1021 		cs = ei->initg[0].final ? ei->initg[0] : ascii;
1022 	} else if (isc1(wc & 0xff)) {
1023 		/* go back to INIT1 or ISO-8859-1 on control chars */
1024 		cs = ei->initg[1].final ? ei->initg[1] : iso88591;
1025 	} else if (!(wc & ~0xff)) {
1026 		if (wc & 0x80) {
1027 			/* special treatment for ISO-8859-1 */
1028 			cs = iso88591;
1029 		} else {
1030 			/* special treatment for ASCII */
1031 			cs = ascii;
1032 		}
1033 	} else {
1034 		cs.final = (wc >> 24) & 0x7f;
1035 		if ((wc >> 16) & 0x80)
1036 			cs.interm = (wc >> 16) & 0x7f;
1037 		else
1038 			cs.interm = '\0';
1039 		if (wc & 0x80)
1040 			cs.type = (wc & 0x00007f00) ? CS96MULTI : CS96;
1041 		else
1042 			cs.type = (wc & 0x00007f00) ? CS94MULTI : CS94;
1043 	}
1044 	target = recommendation(ei, &cs);
1045 	p = tmp;
1046 	bit8 = ei->flags & F_8BIT;
1047 
1048 	/* designate the charset onto the target plane(G0/1/2/3). */
1049 	if (psenc->g[target].type == cs.type &&
1050 	    psenc->g[target].final == cs.final &&
1051 	    psenc->g[target].interm == cs.interm)
1052 		goto planeok;
1053 
1054 	*p++ = '\033';
1055 	if (cs.type == CS94MULTI || cs.type == CS96MULTI)
1056 		*p++ = '$';
1057 	if (target == 0 && cs.type == CS94MULTI && strchr("@AB", cs.final) &&
1058 	    !cs.interm && !(ei->flags & F_NOOLD))
1059 		;
1060 	else if (cs.type == CS94 || cs.type == CS94MULTI)
1061 		*p++ = "()*+"[target];
1062 	else
1063 		*p++ = ",-./"[target];
1064 	if (cs.interm)
1065 		*p++ = cs.interm;
1066 	*p++ = cs.final;
1067 
1068 	psenc->g[target].type = cs.type;
1069 	psenc->g[target].final = cs.final;
1070 	psenc->g[target].interm = cs.interm;
1071 
1072 planeok:
1073 	/* invoke the plane onto GL or GR. */
1074 	if (psenc->gl == target)
1075 		goto sideok;
1076 	if (bit8 && psenc->gr == target)
1077 		goto sideok;
1078 
1079 	if (target == 0 && (ei->flags & F_LS0)) {
1080 		*p++ = '\017';
1081 		psenc->gl = 0;
1082 	} else if (target == 1 && (ei->flags & F_LS1)) {
1083 		*p++ = '\016';
1084 		psenc->gl = 1;
1085 	} else if (target == 2 && (ei->flags & F_LS2)) {
1086 		*p++ = '\033';
1087 		*p++ = 'n';
1088 		psenc->gl = 2;
1089 	} else if (target == 3 && (ei->flags & F_LS3)) {
1090 		*p++ = '\033';
1091 		*p++ = 'o';
1092 		psenc->gl = 3;
1093 	} else if (bit8 && target == 1 && (ei->flags & F_LS1R)) {
1094 		*p++ = '\033';
1095 		*p++ = '~';
1096 		psenc->gr = 1;
1097 	} else if (bit8 && target == 2 && (ei->flags & F_LS2R)) {
1098 		*p++ = '\033';
1099 		/*{*/
1100 		*p++ = '}';
1101 		psenc->gr = 2;
1102 	} else if (bit8 && target == 3 && (ei->flags & F_LS3R)) {
1103 		*p++ = '\033';
1104 		*p++ = '|';
1105 		psenc->gr = 3;
1106 	} else if (target == 2 && (ei->flags & F_SS2)) {
1107 		*p++ = '\033';
1108 		*p++ = 'N';
1109 		psenc->singlegl = 2;
1110 	} else if (target == 3 && (ei->flags & F_SS3)) {
1111 		*p++ = '\033';
1112 		*p++ = 'O';
1113 		psenc->singlegl = 3;
1114 	} else if (bit8 && target == 2 && (ei->flags & F_SS2R)) {
1115 		*p++ = '\216';
1116 		*p++ = 'N';
1117 		psenc->singlegl = psenc->singlegr = 2;
1118 	} else if (bit8 && target == 3 && (ei->flags & F_SS3R)) {
1119 		*p++ = '\217';
1120 		*p++ = 'O';
1121 		psenc->singlegl = psenc->singlegr = 3;
1122 	} else
1123 		goto ilseq;
1124 
1125 sideok:
1126 	if (psenc->singlegl == target)
1127 		mask = 0x00;
1128 	else if (psenc->singlegr == target)
1129 		mask = 0x80;
1130 	else if (psenc->gl == target)
1131 		mask = 0x00;
1132 	else if ((ei->flags & F_8BIT) && psenc->gr == target)
1133 		mask = 0x80;
1134 	else
1135 		goto ilseq;
1136 
1137 	switch (cs.type) {
1138 	case CS94:
1139 	case CS96:
1140 		i = 1;
1141 		break;
1142 	case CS94MULTI:
1143 	case CS96MULTI:
1144 		i = !iscntl(wc & 0xff) ?
1145 		    (isthree(cs.final) ? 3 : 2) : 1;
1146 		break;
1147 	}
1148 	while (i-- > 0)
1149 		*p++ = ((wc >> (i << 3)) & 0x7f) | mask;
1150 
1151 	/* reset single shift state */
1152 	psenc->singlegl = psenc->singlegr = -1;
1153 
1154 	len = (size_t)(p - tmp);
1155 	if (n < len) {
1156 		if (result)
1157 			*result = (char *)0;
1158 		*nresult = (size_t)-1;
1159 		return (E2BIG);
1160 	}
1161 	if (result)
1162 		*result = string + len;
1163 	memcpy(string, tmp, len);
1164 	*nresult = len;
1165 
1166 	return (0);
1167 
1168 ilseq:
1169 	*nresult = (size_t)-1;
1170 	return (EILSEQ);
1171 }
1172 
1173 static int
1174 _citrus_ISO2022_put_state_reset(_ISO2022EncodingInfo * __restrict ei,
1175     char * __restrict s, size_t n, _ISO2022State * __restrict psenc,
1176     size_t * __restrict nresult)
1177 {
1178 	char *result;
1179 	char buf[MB_LEN_MAX];
1180 	size_t len;
1181 	int ret;
1182 
1183 	/* XXX state will be modified after this operation... */
1184 	ret = _ISO2022_sputwchar(ei, L'\0', buf, sizeof(buf), &result, psenc,
1185 	    &len);
1186 	if (ret) {
1187 		*nresult = len;
1188 		return (ret);
1189 	}
1190 
1191 	if (sizeof(buf) < len || n < len-1) {
1192 		/* XXX should recover state? */
1193 		*nresult = (size_t)-1;
1194 		return (E2BIG);
1195 	}
1196 
1197 	memcpy(s, buf, len - 1);
1198 	*nresult = len - 1;
1199 	return (0);
1200 }
1201 
1202 static int
1203 _citrus_ISO2022_wcrtomb_priv(_ISO2022EncodingInfo * __restrict ei,
1204     char * __restrict s, size_t n, wchar_t wc,
1205     _ISO2022State * __restrict psenc, size_t * __restrict nresult)
1206 {
1207 	char *result;
1208 	char buf[MB_LEN_MAX];
1209 	size_t len;
1210 	int ret;
1211 
1212 	/* XXX state will be modified after this operation... */
1213 	ret = _ISO2022_sputwchar(ei, wc, buf, sizeof(buf), &result, psenc,
1214 	    &len);
1215 	if (ret) {
1216 		*nresult = len;
1217 		return (ret);
1218 	}
1219 
1220 	if (sizeof(buf) < len || n < len) {
1221 		/* XXX should recover state? */
1222 		*nresult = (size_t)-1;
1223 		return (E2BIG);
1224 	}
1225 
1226 	memcpy(s, buf, len);
1227 	*nresult = len;
1228 	return (0);
1229 }
1230 
1231 static __inline int
1232 /*ARGSUSED*/
1233 _citrus_ISO2022_stdenc_wctocs(_ISO2022EncodingInfo * __restrict ei __unused,
1234     _csid_t * __restrict csid, _index_t * __restrict idx, wchar_t wc)
1235 {
1236 	wchar_t m, nm;
1237 
1238 	m = wc & 0x7FFF8080;
1239 	nm = wc & 0x007F7F7F;
1240 	if (m & 0x00800000)
1241 		nm &= 0x00007F7F;
1242 	else
1243 		m &= 0x7F008080;
1244 	if (nm & 0x007F0000) {
1245 		/* ^3 mark */
1246 		m |= 0x007F0000;
1247 	} else if (nm & 0x00007F00) {
1248 		/* ^2 mark */
1249 		m |= 0x00007F00;
1250 	}
1251 	*csid = (_csid_t)m;
1252 	*idx  = (_index_t)nm;
1253 
1254 	return (0);
1255 }
1256 
1257 static __inline int
1258 /*ARGSUSED*/
1259 _citrus_ISO2022_stdenc_cstowc(_ISO2022EncodingInfo * __restrict ei __unused,
1260     wchar_t * __restrict wc, _csid_t csid, _index_t idx)
1261 {
1262 
1263 	*wc = (wchar_t)(csid & 0x7F808080) | (wchar_t)idx;
1264 
1265 	return (0);
1266 }
1267 
1268 static __inline int
1269 /*ARGSUSED*/
1270 _citrus_ISO2022_stdenc_get_state_desc_generic(_ISO2022EncodingInfo * __restrict ei __unused,
1271     _ISO2022State * __restrict psenc, int * __restrict rstate)
1272 {
1273 
1274 	if (psenc->chlen == 0) {
1275 		/* XXX: it should distinguish initial and stable. */
1276 		*rstate = _STDENC_SDGEN_STABLE;
1277 	} else
1278 		*rstate = (psenc->ch[0] == '\033') ?
1279 		    _STDENC_SDGEN_INCOMPLETE_SHIFT :
1280 		    _STDENC_SDGEN_INCOMPLETE_CHAR;
1281 	return (0);
1282 }
1283 
1284 /* ----------------------------------------------------------------------
1285  * public interface for stdenc
1286  */
1287 
1288 _CITRUS_STDENC_DECLS(ISO2022);
1289 _CITRUS_STDENC_DEF_OPS(ISO2022);
1290 
1291 #include "citrus_stdenc_template.h"
1292