aboutsummaryrefslogtreecommitdiff
path: root/iconvdata/iso-2022-cn-ext.c
blob: cce29b19692263d6020beea45f7a1d3126e81ca0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
/* Conversion module for ISO-2022-CN-EXT.
   Copyright (C) 2000-2024 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <dlfcn.h>
#include <gconv.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "gb2312.h"
#include "iso-ir-165.h"
#include "cns11643.h"
#include "cns11643l1.h"
#include "cns11643l2.h"
#include <libc-diag.h>

#include <assert.h>

/* This makes obvious what everybody knows: 0x1b is the Esc character.  */
#define ESC	0x1b

/* We have single-byte shift-in and shift-out sequences, and the single
   shift sequences SS2 and SS3 which replaces the SS2/SS3 designation for
   the next two bytes.  */
#define SI	0x0f
#define SO	0x0e
#define SS2_0	ESC
#define SS2_1	0x4e
#define SS3_0	ESC
#define SS3_1	0x4f

/* Definitions used in the body of the `gconv' function.  */
#define CHARSET_NAME		"ISO-2022-CN-EXT//"
#define DEFINE_INIT		1
#define DEFINE_FINI		1
#define ONE_DIRECTION		0
#define FROM_LOOP		from_iso2022cn_ext_loop
#define TO_LOOP			to_iso2022cn_ext_loop
#define FROM_LOOP_MIN_NEEDED_FROM	1
#define FROM_LOOP_MAX_NEEDED_FROM	4
#define FROM_LOOP_MIN_NEEDED_TO		4
#define FROM_LOOP_MAX_NEEDED_TO		4
#define TO_LOOP_MIN_NEEDED_FROM		4
#define TO_LOOP_MAX_NEEDED_FROM		4
#define TO_LOOP_MIN_NEEDED_TO		1
#define TO_LOOP_MAX_NEEDED_TO		6
#define PREPARE_LOOP \
  int save_set;								      \
  int *setp = &data->__statep->__count;
#define EXTRA_LOOP_ARGS		, setp


/* The charsets GB/T 12345-90, GB 7589-87, GB/T 13131-9X, GB 7590-87,
   and GB/T 13132-9X are not registered to the best of my knowledge and
   therefore have no escape sequence assigned.  We cannot handle them
   for this reason.  Tell the implementation about this.  */
#define X12345	'\0'
#define X7589	'\0'
#define X13131	'\0'
#define X7590	'\0'
#define X13132	'\0'


/* The COUNT element of the state keeps track of the currently selected
   character set.  The possible values are:  */
enum
{
  ASCII_set = 0,
  GB2312_set,
  GB12345_set,
  CNS11643_1_set,
  ISO_IR_165_set,
  SO_mask = 7,

  GB7589_set = 1 << 3,
  GB13131_set = 2 << 3,
  CNS11643_2_set = 3 << 3,
  SS2_mask = 3 << 3,

  GB7590_set = 1 << 5,
  GB13132_set = 2 << 5,
  CNS11643_3_set = 3 << 5,
  CNS11643_4_set = 4 << 5,
  CNS11643_5_set = 5 << 5,
  CNS11643_6_set = 6 << 5,
  CNS11643_7_set = 7 << 5,
  SS3_mask = 7 << 5,

#define CURRENT_MASK (SO_mask | SS2_mask | SS3_mask)

  GB2312_ann = 1 << 8,
  GB12345_ann = 2 << 8,
  CNS11643_1_ann = 3 << 8,
  ISO_IR_165_ann = 4 << 8,
  SO_ann = 7 << 8,

  GB7589_ann = 1 << 11,
  GB13131_ann = 2 << 11,
  CNS11643_2_ann = 3 << 11,
  SS2_ann = 3 << 11,

  GB7590_ann = 1 << 13,
  GB13132_ann = 2 << 13,
  CNS11643_3_ann = 3 << 13,
  CNS11643_4_ann = 4 << 13,
  CNS11643_5_ann = 5 << 13,
  CNS11643_6_ann = 6 << 13,
  CNS11643_7_ann = 7 << 13,
  SS3_ann = 7 << 13
};


/* Since this is a stateful encoding we have to provide code which resets
   the output state to the initial state.  This has to be done during the
   flushing.  */
#define EMIT_SHIFT_TO_INIT \
  if (data->__statep->__count >> 3 != ASCII_set)			      \
    {									      \
      if (FROM_DIRECTION)						      \
	/* It's easy, we don't have to emit anything, we just reset the	      \
	   state for the input.  */					      \
	data->__statep->__count = ASCII_set << 3;			      \
      else								      \
	{								      \
	  /* We are not in the initial state.  To switch back we have	      \
	     to emit `SI'.  */						      \
	  if (__glibc_unlikely (outbuf == outend))			      \
	    /* We don't have enough room in the output buffer.  */	      \
	    status = __GCONV_FULL_OUTPUT;				      \
	  else								      \
	    {								      \
	      /* Write out the shift sequence.  */			      \
	      *outbuf++ = SI;						      \
	      if (data->__flags & __GCONV_IS_LAST)			      \
		*irreversible += 1;					      \
	      data->__statep->__count = ASCII_set << 3;			      \
	    }								      \
	}								      \
    }


/* Since we might have to reset input pointer we must be able to save
   and restore the state.  */
#define SAVE_RESET_STATE(Save) \
  if (Save)								      \
    save_set = *setp;							      \
  else									      \
    *setp = save_set


/* First define the conversion function from ISO-2022-CN to UCS4.  */
#define MIN_NEEDED_INPUT	FROM_LOOP_MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT	FROM_LOOP_MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT	FROM_LOOP_MIN_NEEDED_TO
#define MAX_NEEDED_OUTPUT	FROM_LOOP_MAX_NEEDED_TO
#define LOOPFCT			FROM_LOOP
#define BODY \
  {									      \
    uint32_t ch = *inptr;						      \
									      \
    /* This is a 7bit character set, disallow all 8bit characters.  */	      \
    if (ch > 0x7f)							      \
      STANDARD_FROM_LOOP_ERR_HANDLER (1);				      \
									      \
    /* Recognize escape sequences.  */					      \
    if (ch == ESC)							      \
      {									      \
	/* There are three kinds of escape sequences we have to handle:	      \
	   - those announcing the use of GB and CNS characters on the	      \
	     line; we can simply ignore them				      \
	   - the initial byte of the SS2 sequence.			      \
	   - the initial byte of the SS3 sequence.			      \
	*/								      \
	if (inptr + 2 > inend						      \
	    || (inptr[1] == '$'						      \
		&& (inptr + 3 > inend					      \
		    || (inptr[2] == ')' && inptr + 4 > inend)		      \
		    || (inptr[2] == '*' && inptr + 4 > inend)		      \
		    || (inptr[2] == '+' && inptr + 4 > inend)))		      \
	    || (inptr[1] == SS2_1 && inptr + 4 > inend)			      \
	    || (inptr[1] == SS3_1 && inptr + 4 > inend))		      \
	  {								      \
	    result = __GCONV_INCOMPLETE_INPUT;				      \
	    break;							      \
	  }								      \
	if (inptr[1] == '$'						      \
	    && ((inptr[2] == ')'					      \
		 && (inptr[3] == 'A'					      \
		     || (X12345 != '\0' && inptr[3] == X12345)		      \
		     || inptr[3] == 'E' || inptr[3] == 'G'))		      \
		|| (inptr[2] == '*'					      \
		    && ((X7589 != '\0' && inptr[3] == X7589)		      \
			|| (X13131 != '\0' && inptr[3] == X13131)	      \
			|| inptr[3] == 'H'))				      \
		|| (inptr[2] == '+'					      \
		    && ((X7590 != '\0' && inptr[3] == X7590)		      \
			|| (X13132 != '\0' && inptr[3] == X13132)	      \
			|| inptr[3] == 'I' || inptr[3] == 'J'		      \
			|| inptr[3] == 'K' || inptr[3] == 'L'		      \
			|| inptr[3] == 'M'))))				      \
	  {								      \
	    /* OK, we accept those character sets.  */			      \
	    if (inptr[3] == 'A')					      \
	      ann = (ann & ~SO_ann) | GB2312_ann;			      \
	    else if (inptr[3] == 'G')					      \
	      ann = (ann & ~SO_ann) | CNS11643_1_ann;			      \
	    else if (inptr[3] == 'E')					      \
	      ann = (ann & ~SO_ann) | ISO_IR_165_ann;			      \
	    else if (X12345 != '\0' && inptr[3] == X12345)		      \
	      ann = (ann & ~SO_ann) | GB12345_ann;			      \
	    else if (inptr[3] == 'H')					      \
	      ann = (ann & ~SS2_ann) | CNS11643_2_ann;			      \
	    else if (X7589 != '\0' && inptr[3] == X7589)		      \
	      ann = (ann & ~SS2_ann) | GB7589_ann;			      \
	    else if (X13131 != '\0' && inptr[3] == X13131)		      \
	      ann = (ann & ~SS2_ann) | GB13131_ann;			      \
	    else if (inptr[3] == 'I')					      \
	      ann = (ann & ~SS3_ann) | CNS11643_3_ann;			      \
	    else if (inptr[3] == 'J')					      \
	      ann = (ann & ~SS3_ann) | CNS11643_4_ann;			      \
	    else if (inptr[3] == 'K')					      \
	      ann = (ann & ~SS3_ann) | CNS11643_5_ann;			      \
	    else if (inptr[3] == 'L')					      \
	      ann = (ann & ~SS3_ann) | CNS11643_6_ann;			      \
	    else if (inptr[3] == 'M')					      \
	      ann = (ann & ~SS3_ann) | CNS11643_7_ann;			      \
	    else if (X7590 != '\0' && inptr[3] == X7590)		      \
	      ann = (ann & ~SS3_ann) | GB7590_ann;			      \
	    else if (X13132 != '\0' && inptr[3] == X13132)		      \
	      ann = (ann & ~SS3_ann) | GB13132_ann;			      \
	    inptr += 4;							      \
	    continue;							      \
	  }								      \
      }									      \
    else if (ch == SO)							      \
      {									      \
	/* Switch to use GB2312, GB12345, CNS 11643 plane 1, or ISO-IR-165,   \
	   depending on which S0 designation came last.  The only problem     \
	   is what to do with faulty input files where no designator came.    \
	   XXX For now I'll default to use GB2312.  If this is not the	      \
	   best behavior (e.g., we should flag an error) let me know.  */     \
	++inptr;							      \
	if ((ann & SO_ann) != 0)					      \
	  switch (ann & SO_ann)						      \
	    {								      \
	    case GB2312_ann:						      \
	      set = GB2312_set;						      \
	      break;							      \
	    case GB12345_ann:						      \
	      set = GB12345_set;					      \
	      break;							      \
	    case CNS11643_1_ann:					      \
	      set = CNS11643_1_set;					      \
	      break;							      \
	    case ISO_IR_165_ann:					      \
	      set = ISO_IR_165_set;					      \
	      break;							      \
	    default:							      \
	      abort ();							      \
	    }								      \
	else								      \
	  {								      \
	    STANDARD_FROM_LOOP_ERR_HANDLER (1);				      \
	  }								      \
	continue;							      \
      }									      \
    else if (ch == SI)							      \
      {									      \
	/* Switch to use ASCII.  */					      \
	++inptr;							      \
	set = ASCII_set;						      \
	continue;							      \
      }									      \
									      \
    if (ch == ESC && inptr[1] == SS2_1)					      \
      {									      \
	/* This is a character from CNS 11643 plane 2.			      \
	   XXX We could test here whether the use of this character	      \
	   set was announced.						      \
	   XXX Currently GB7589 and GB13131 are not supported.  */	      \
	inptr += 2;							      \
	ch = cns11643l2_to_ucs4 (&inptr, 2, 0);				      \
	if (ch == __UNKNOWN_10646_CHAR)					      \
	  STANDARD_FROM_LOOP_ERR_HANDLER (2);				      \
      }									      \
    /* Note that we can assume here that at least 4 bytes are available if    \
       the first byte is ESC since otherwise the first if would have been     \
       true.  */							      \
    else if (ch == ESC && inptr[1] == SS3_1)				      \
      {									      \
	/* This is a character from CNS 11643 plane 3 or higher.	      \
	   XXX Currently GB7590 and GB13132 are not supported.  */	      \
	unsigned char buf[3];						      \
	const unsigned char *tmp = buf;					      \
									      \
	buf[1] = inptr[2];						      \
	buf[2] = inptr[3];						      \
	switch (ann & SS3_ann)						      \
	  {								      \
	  case CNS11643_3_ann:						      \
	    buf[0] = 0x23;						      \
	    ch = cns11643_to_ucs4 (&tmp, 3, 0);				      \
	    break;							      \
	  case CNS11643_4_ann:						      \
	    buf[0] = 0x24;						      \
	    ch = cns11643_to_ucs4 (&tmp, 3, 0);				      \
	    break;							      \
	  case CNS11643_5_ann:						      \
	    buf[0] = 0x25;						      \
	    ch = cns11643_to_ucs4 (&tmp, 3, 0);				      \
	    break;							      \
	  case CNS11643_6_ann:						      \
	    buf[0] = 0x26;						      \
	    ch = cns11643_to_ucs4 (&tmp, 3, 0);				      \
	    break;							      \
	  case CNS11643_7_ann:						      \
	    buf[0] = 0x27;						      \
	    ch = cns11643_to_ucs4 (&tmp, 3, 0);				      \
	    break;							      \
	  default:							      \
	    /* XXX Currently GB7590 and GB13132 are not supported.  */	      \
	    ch = __UNKNOWN_10646_CHAR;					      \
	    break;							      \
	  }								      \
	if (ch == __UNKNOWN_10646_CHAR)					      \
	  {								      \
	    STANDARD_FROM_LOOP_ERR_HANDLER (4);				      \
	  }								      \
	assert (tmp == buf + 3);					      \
	inptr += 4;							      \
      }									      \
    else if (set == ASCII_set)						      \
      {									      \
	/* Almost done, just advance the input pointer.  */		      \
	++inptr;							      \
      }									      \
    else								      \
      {									      \
	/* That's pretty easy, we have a dedicated functions for this.  */    \
	if (inend - inptr < 2)						      \
	  {								      \
	    result = __GCONV_INCOMPLETE_INPUT;				      \
	    break;							      \
	  }								      \
	if (set == GB2312_set)						      \
	  ch = gb2312_to_ucs4 (&inptr, inend - inptr, 0);		      \
	else if (set == ISO_IR_165_set)					      \
	  ch = isoir165_to_ucs4 (&inptr, inend - inptr);		      \
	else								      \
	  {								      \
	    assert (set == CNS11643_1_set);				      \
	    ch = cns11643l1_to_ucs4 (&inptr, inend - inptr, 0);		      \
	  }								      \
									      \
	if (ch == 0)							      \
	  {								      \
	    result = __GCONV_INCOMPLETE_INPUT;				      \
	    break;							      \
	  }								      \
	else if (ch == __UNKNOWN_10646_CHAR)				      \
	  {								      \
	    STANDARD_FROM_LOOP_ERR_HANDLER (2);				      \
	  }								      \
      }									      \
									      \
    *((uint32_t *) outptr) = ch;					      \
    outptr += sizeof (uint32_t);					      \
  }
#define EXTRA_LOOP_DECLS	, int *setp
#define INIT_PARAMS		int set = (*setp >> 3) & CURRENT_MASK; \
				int ann = (*setp >> 3) & ~CURRENT_MASK
#define UPDATE_PARAMS		*setp = (set | ann) << 3
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>


/* Next, define the other direction.  */
#define MIN_NEEDED_INPUT	TO_LOOP_MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT	TO_LOOP_MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT	TO_LOOP_MIN_NEEDED_TO
#define MAX_NEEDED_OUTPUT	TO_LOOP_MAX_NEEDED_TO
#define LOOPFCT			TO_LOOP
/* With GCC 5.3 when compiling with -Os the compiler emits a warning
   that buf[0] and buf[1] may be used uninitialized.  This can only
   happen in the case where tmpbuf[3] is used, and in that case the
   write to the tmpbuf[1] and tmpbuf[2] was assured because
   ucs4_to_cns11643 would have filled in those entries.  The difficulty
   is in getting the compiler to see this logic because tmpbuf[0] is
   involved in determining the code page and is the indicator that
   tmpbuf[2] is initialized.  */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
#define BODY \
  {									      \
    uint32_t ch;							      \
    size_t written = 0;							      \
									      \
    ch = *((const uint32_t *) inptr);					      \
									      \
    /* First see whether we can write the character using the currently	      \
       selected character set.  */					      \
    if (ch < 0x80)							      \
      {									      \
	if (set != ASCII_set)						      \
	  {								      \
	    *outptr++ = SI;						      \
	    set = ASCII_set;						      \
	    if (outptr == outend)					      \
	      {								      \
		result = __GCONV_FULL_OUTPUT;				      \
		break;							      \
	      }								      \
	  }								      \
									      \
	*outptr++ = ch;							      \
	written = 1;							      \
									      \
	/* At the end of the line we have to clear the `ann' flags since      \
	   every line must contain this information again.  */		      \
	if (ch == L'\n')						      \
	  ann = 0;							      \
      }									      \
    else								      \
      {									      \
	unsigned char buf[2] = { 0, 0 };				      \
	int used;							      \
									      \
	if (set == GB2312_set || ((ann & SO_ann) != CNS11643_1_ann	      \
				  && (ann & SO_ann) != ISO_IR_165_ann))	      \
	  {								      \
	    written = ucs4_to_gb2312 (ch, buf, 2);			      \
	    used = GB2312_set;						      \
	  }								      \
	else if (set == ISO_IR_165_set || (ann & SO_ann) == ISO_IR_165_set)   \
	  {								      \
	    written = ucs4_to_isoir165 (ch, buf, 2);			      \
	    used = ISO_IR_165_set;					      \
	  }								      \
	else								      \
	  {								      \
	    written = ucs4_to_cns11643l1 (ch, buf, 2);			      \
	    used = CNS11643_1_set;					      \
	  }								      \
									      \
	if (written == __UNKNOWN_10646_CHAR)				      \
	  {								      \
	    /* Cannot convert it using the currently selected SO set.	      \
	       Next try the SS2 set.  */				      \
	    written = ucs4_to_cns11643l2 (ch, buf, 2);			      \
	    if (written != __UNKNOWN_10646_CHAR)			      \
	      /* Yep, that worked.  */					      \
	      used = CNS11643_2_set;					      \
	    else							      \
	      {								      \
		unsigned char tmpbuf[3];				      \
									      \
		switch (0)						      \
		  {							      \
		  default:						      \
		    /* Well, see whether we have to change the SO set.  */    \
									      \
		    if (used != GB2312_set)				      \
		      {							      \
			written = ucs4_to_gb2312 (ch, buf, 2);		      \
			if (written != __UNKNOWN_10646_CHAR)		      \
			  {						      \
			    used = GB2312_set;				      \
			    break;					      \
			  }						      \
		      }							      \
									      \
		    if (used != ISO_IR_165_set)				      \
		      {							      \
			written = ucs4_to_isoir165 (ch, buf, 2);	      \
			if (written != __UNKNOWN_10646_CHAR)		      \
			  {						      \
			    used = ISO_IR_165_set;			      \
			    break;					      \
			  }						      \
		      }							      \
									      \
		    if (used != CNS11643_1_set)				      \
		      {							      \
			written = ucs4_to_cns11643l1 (ch, buf, 2);	      \
			if (written != __UNKNOWN_10646_CHAR)		      \
			  {						      \
			    used = CNS11643_1_set;			      \
			    break;					      \
			  }						      \
		      }							      \
									      \
		    written = ucs4_to_cns11643 (ch, tmpbuf, 3);		      \
		    if (written == 3 && tmpbuf[0] >= 3 && tmpbuf[0] <= 7)     \
		      {							      \
			buf[0] = tmpbuf[1];				      \
			buf[1] = tmpbuf[2];				      \
			switch (tmpbuf[0])				      \
			  {						      \
			  case 3:					      \
			    used = CNS11643_3_set;			      \
			    break;					      \
			  case 4:					      \
			    used = CNS11643_4_set;			      \
			    break;					      \
			  case 5:					      \
			    used = CNS11643_5_set;			      \
			    break;					      \
			  case 6:					      \
			    used = CNS11643_6_set;			      \
			    break;					      \
			  case 7:					      \
			    used = CNS11643_7_set;			      \
			    break;					      \
			  default:					      \
			    abort ();					      \
			  }						      \
			written = 2;					      \
			break;						      \
		      }							      \
									      \
		    /* XXX Currently GB7590 and GB13132 are not supported.  */\
									      \
		    /* Even this does not work.  Error.  */		      \
		    used = ASCII_set;					      \
		  }							      \
		if (used == ASCII_set)					      \
		  {							      \
		    UNICODE_TAG_HANDLER (ch, 4);			      \
		    STANDARD_TO_LOOP_ERR_HANDLER (4);			      \
		  }							      \
	      }								      \
	  }								      \
	assert (written == 2);						      \
									      \
	/* See whether we have to emit an escape sequence.  */		      \
	if (set != used)						      \
	  {								      \
	    /* First see whether we announced that we use this		      \
	       character set.  */					      \
	    if ((used & SO_mask) != 0 && (ann & SO_ann) != (used << 8))	      \
	      {								      \
		const char *escseq;					      \
									      \
		if (outptr + 4 > outend)				      \
		  {							      \
		    result = __GCONV_FULL_OUTPUT;			      \
		    break;						      \
		  }							      \
									      \
		assert (used >= 1 && used <= 4);			      \
		escseq = ")A\0\0)G)E" + (used - 1) * 2;			      \
		*outptr++ = ESC;					      \
		*outptr++ = '$';					      \
		*outptr++ = *escseq++;					      \
		*outptr++ = *escseq++;					      \
									      \
		ann = (ann & ~SO_ann) | (used << 8);			      \
	      }								      \
	    else if ((used & SS2_mask) != 0 && (ann & SS2_ann) != (used << 8))\
	      {								      \
		const char *escseq;					      \
									      \
		if (outptr + 4 > outend)				      \
		  {							      \
		    result = __GCONV_FULL_OUTPUT;			      \
		    break;						      \
		  }							      \
									      \
		assert (used == CNS11643_2_set); /* XXX */		      \
		escseq = "*H";						      \
		*outptr++ = ESC;					      \
		*outptr++ = '$';					      \
		*outptr++ = *escseq++;					      \
		*outptr++ = *escseq++;					      \
									      \
		ann = (ann & ~SS2_ann) | (used << 8);			      \
	      }								      \
	    else if ((used & SS3_mask) != 0 && (ann & SS3_ann) != (used << 8))\
	      {								      \
		const char *escseq;					      \
									      \
		if (outptr + 4 > outend)				      \
		  {							      \
		    result = __GCONV_FULL_OUTPUT;			      \
		    break;						      \
		  }							      \
									      \
		assert ((used >> 5) >= 3 && (used >> 5) <= 7);		      \
		escseq = "+I+J+K+L+M" + ((used >> 5) - 3) * 2;		      \
		*outptr++ = ESC;					      \
		*outptr++ = '$';					      \
		*outptr++ = *escseq++;					      \
		*outptr++ = *escseq++;					      \
									      \
		ann = (ann & ~SS3_ann) | (used << 8);			      \
	      }								      \
									      \
	    if (used == CNS11643_2_set)					      \
	      {								      \
		if (outptr + 2 > outend)				      \
		  {							      \
		    result = __GCONV_FULL_OUTPUT;			      \
		    break;						      \
		  }							      \
		*outptr++ = SS2_0;					      \
		*outptr++ = SS2_1;					      \
	      }								      \
	    else if (used >= CNS11643_3_set && used <= CNS11643_7_set)	      \
	      {								      \
		if (outptr + 2 > outend)				      \
		  {							      \
		    result = __GCONV_FULL_OUTPUT;			      \
		    break;						      \
		  }							      \
		*outptr++ = SS3_0;					      \
		*outptr++ = SS3_1;					      \
	      }								      \
	    else							      \
	      {								      \
		/* We only have to emit something if currently ASCII is	      \
		   selected.  Otherwise we are switching within the	      \
		   SO charset.  */					      \
		if (set == ASCII_set)					      \
		  {							      \
		    if (outptr + 1 > outend)				      \
		      {							      \
			result = __GCONV_FULL_OUTPUT;			      \
			break;						      \
		      }							      \
		    *outptr++ = SO;					      \
		  }							      \
	      }								      \
									      \
	    /* Always test the length here since we have used up all the      \
	       guaranteed output buffer slots.  */			      \
	    if (outptr + 2 > outend)					      \
	      {								      \
		result = __GCONV_FULL_OUTPUT;				      \
		break;							      \
	      }								      \
	  }								      \
	else if (outptr + 2 > outend)					      \
	  {								      \
	    result = __GCONV_FULL_OUTPUT;				      \
	    break;							      \
	  }								      \
									      \
	*outptr++ = buf[0];						      \
	*outptr++ = buf[1];						      \
	set = used;							      \
      }									      \
									      \
    /* Now that we wrote the output increment the input pointer.  */	      \
    inptr += 4;								      \
  }
DIAG_POP_NEEDS_COMMENT;
#define EXTRA_LOOP_DECLS	, int *setp
#define INIT_PARAMS		int set = (*setp >> 3) & CURRENT_MASK; \
				int ann = (*setp >> 3) & ~CURRENT_MASK
#define REINIT_PARAMS		do					      \
				  {					      \
				    set = (*setp >> 3) & CURRENT_MASK;	      \
				    ann = (*setp >> 3) & ~CURRENT_MASK;	      \
				  }					      \
				while (0)
#define UPDATE_PARAMS		*setp = (set | ann) << 3
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>


/* Now define the toplevel functions.  */
#include <iconv/skeleton.c>