Source

emacs / src / charset.h

  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
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
/* Header for multilingual character handler.
   Copyright (C) 1995, 1997, 1998 Electrotechnical Laboratory, JAPAN.
   Licensed to the Free Software Foundation.

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Emacs 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#ifndef _CHARSET_H
#define _CHARSET_H

/*** GENERAL NOTE on CHARACTER SET (CHARSET) ***

  A character set ("charset" hereafter) is a meaningful collection
  (i.e. language, culture, functionality, etc) of characters.  Emacs
  handles multiple charsets at once.  Each charset corresponds to one
  of ISO charsets (except for a special charset for composition
  characters).  Emacs identifies a charset by a unique identification
  number, whereas ISO identifies a charset by a triplet of DIMENSION,
  CHARS and FINAL-CHAR.  So, hereafter, just saying "charset" means an
  identification number (integer value).

  The value range of charset is 0x00, 0x80..0xFE.  There are four
  kinds of charset depending on DIMENSION (1 or 2) and CHARS (94 or
  96).  For instance, a charset of DIMENSION2_CHARS94 contains 94x94


  Within Emacs Lisp, a charset is treated as a symbol which has a
  property `charset'.  The property value is a vector containing
  various information about the charset.  For readability of C codes,
  we use the following convention on C variable names:
	charset_symbol: Emacs Lisp symbol of a charset
	charset_id: Emacs Lisp integer of an identification number of a charset
	charset: C integer of an identification number of a charset

  Each charset (except for ASCII) is assigned a base leading-code
  (range 0x80..0x9D).  In addition, a charset of greater than 0xA0
  (whose base leading-code is 0x9A..0x9D) is assigned an extended
  leading-code (range 0xA0..0xFE).  In this case, each base
  leading-code specify the allowable range of extended leading-code as
  shown in the table below.  A leading-code is used to represent a
  character in Emacs' buffer and string.

  We call a charset which has extended leading-code as "private
  charset" because those are mainly for a charset which is not
  registered by ISO.  On the contrary, we call a charset which does
  not have extended leading-code as "official charset".

  ---------------------------------------------------------------------------
  charset	dimension	 base leading-code	extended leading-code
  ---------------------------------------------------------------------------
  0x00		official dim1    -- none --		-- none --
		(ASCII)
  0x01..0x7F	--never used--
  0x80		COMPOSITION	 same as charset	-- none --
  0x81..0x8F	official dim1    same as charset	-- none --
  0x90..0x99	official dim2	 same as charset	-- none --
  0x9A..0x9F	--never used--
  0xA0..0xDF	private dim1	    0x9A		same as charset
		of 1-column width
  0xE0..0xEF	private dim1	    0x9B		same as charset
		of 2-column width
  0xF0..0xF4	private dim2	    0x9C		same as charset
		of 1-column width
  0xF5..0xFE	private dim2	    0x9D		same as charset
		of 2-column width
  0xFF		--never used--
  ---------------------------------------------------------------------------

  In the table, "COMPOSITION" means a charset for a composite
  character which is a character composed from several (up to 16)
  non-composite characters (components).  Although a composite
  character can contain components of many charsets, a composite
  character itself belongs to the charset CHARSET-COMPOSITION.  See
  the document "GENERAL NOTE on COMPOSITE CHARACTER" below for more
  detail.

*/

/* Definition of special leading-codes.  */
/* Base leading-code.  */
/* Special leading-code followed by components of a composite character.  */
#define LEADING_CODE_COMPOSITION	0x80
/* Leading-code followed by extended leading-code.  */
#define LEADING_CODE_PRIVATE_11	0x9A /* for private DIMENSION1 of 1-column */
#define LEADING_CODE_PRIVATE_12	0x9B /* for private DIMENSION1 of 2-column */
#define LEADING_CODE_PRIVATE_21	0x9C /* for private DIMENSION2 of 1-column */
#define LEADING_CODE_PRIVATE_22	0x9D /* for private DIMENSION2 of 2-column */

/* Extended leading-code.  */
/* Start of each extended leading-codes.  */
#define LEADING_CODE_EXT_11 0xA0 /* follows LEADING_CODE_PRIVATE_11 */
#define LEADING_CODE_EXT_12 0xE0 /* follows LEADING_CODE_PRIVATE_12 */
#define LEADING_CODE_EXT_21 0xF0 /* follows LEADING_CODE_PRIVATE_21 */
#define LEADING_CODE_EXT_22 0xF5 /* follows LEADING_CODE_PRIVATE_22 */
/* Maximum value of extended leading-codes.  */
#define LEADING_CODE_EXT_MAX 0xFE

/* Definition of minimum/maximum charset of each DIMENSION.  */
#define MIN_CHARSET_OFFICIAL_DIMENSION1	0x81
#define MAX_CHARSET_OFFICIAL_DIMENSION1	0x8F
#define MIN_CHARSET_OFFICIAL_DIMENSION2	0x90
#define MAX_CHARSET_OFFICIAL_DIMENSION2 0x99
#define MIN_CHARSET_PRIVATE_DIMENSION1	LEADING_CODE_EXT_11
#define MIN_CHARSET_PRIVATE_DIMENSION2	LEADING_CODE_EXT_21

/* Maximum value of overall charset identification number.  */
#define MAX_CHARSET 0xFE

/* Definition of special charsets.  */
#define CHARSET_ASCII		0
#define CHARSET_COMPOSITION	0x80

extern int charset_ascii;	/* ASCII */
extern int charset_composition;	/* for a composite character */
extern int charset_latin_iso8859_1; /* ISO8859-1 (Latin-1) */
extern int charset_jisx0208_1978; /* JISX0208.1978 (Japanese Kanji old set) */
extern int charset_jisx0208;	/* JISX0208.1983 (Japanese Kanji) */
extern int charset_katakana_jisx0201; /* JISX0201.Kana (Japanese Katakana) */
extern int charset_latin_jisx0201; /* JISX0201.Roman (Japanese Roman) */
extern int charset_big5_1;	/* Big5 Level 1 (Chinese Traditional) */
extern int charset_big5_2;	/* Big5 Level 2 (Chinese Traditional) */

/* Check if CH is the head of multi-byte form, i.e.,
   an ASCII character or a base leading-code.  */
#define CHAR_HEAD_P(ch) ((unsigned char) (ch) < 0xA0)

/*** GENERAL NOTE on CHARACTER REPRESENTATION ***

  At first, the term "character" or "char" is used for a multilingual
  character (of course, including ASCII character), not for a byte in
  computer memory.  We use the term "code" or "byte" for the latter
  case.

  A character is identified by charset and one or two POSITION-CODEs.
  POSITION-CODE is the position of the character in the charset.  A
  character of DIMENSION1 charset has one POSITION-CODE: POSITION-CODE-1.
  A character of DIMENSION2 charset has two POSITION-CODE:
  POSITION-CODE-1 and POSITION-CODE-2.  The code range of
  POSITION-CODE is 0x20..0x7F.

  Emacs has two kinds of representation of a character: multi-byte
  form (for buffer and string) and single-word form (for character
  object in Emacs Lisp).  The latter is called "character code" here
  after.  Both representation encode the information of charset and
  POSITION-CODE but in a different way (for instance, MSB of
  POSITION-CODE is set in multi-byte form).

  For details of multi-byte form, see the section "2. Emacs internal
  format handlers" of `coding.c'.

  Emacs uses 19 bits for a character code.  The bits are divided into
  3 fields: FIELD1(5bits):FIELD2(7bits):FIELD3(7bits).

  A character code of DIMENSION1 character uses FIELD2 to hold charset
  and FIELD3 to hold POSITION-CODE-1.  A character code of DIMENSION2
  character uses FIELD1 to hold charset, FIELD2 and FIELD3 to hold
  POSITION-CODE-1 and POSITION-CODE-2 respectively.

  More precisely...

  FIELD2 of DIMENSION1 character (except for ASCII) is "charset - 0x70".
  This is to make all character codes except for ASCII greater than
  256 (ASCII's FIELD2 is 0).  So, the range of FIELD2 of DIMENSION1
  character is 0 or 0x11..0x7F.

  FIELD1 of DIMENSION2 character is "charset - 0x8F" for official
  charset and "charset - 0xE0" for private charset.  So, the range of
  FIELD1 of DIMENSION2 character is 0x01..0x1E.

  -----------------------------------------------------------------------
  charset	FIELD1 (5-bit)	    FIELD2 (7-bit)	FIELD3 (7-bit)
  -----------------------------------------------------------------------
  ASCII		0		    0			POSITION-CODE-1
  DIMENSION1	0		    charset - 0x70	POSITION-CODE-1
  DIMENSION2(o)	charset - 0x8F	    POSITION-CODE-1	POSITION-CODE-2
  DIMENSION2(p)	charset - 0xE0	    POSITION-CODE-1	POSITION-CODE-2
  -----------------------------------------------------------------------
  "(o)": official, "(p)": private
  -----------------------------------------------------------------------

*/

/*** GENERAL NOTE on COMPOSITE CHARACTER ***

  A composite character is a character composed from several (up to
  16) non-composite characters (components).  Although each components
  can belong to any charset, a composite character itself belongs to
  the charset `charset-composition' and is assigned a special
  leading-code `LEADING_CODE_COMPOSITION' for multi-byte form.  See
  the document "2. Emacs internal format handlers" in `coding.c' for
  more detail about multi-byte form.

  A character code of composite character has special format.  In the
  above document, FIELD1 of a composite character is 0x1F.  Each
  composite character is assigned a sequential number CMPCHAR-ID.
  FIELD2 and FIELD3 are combined to make 14bits field for holding
  CMPCHAR-ID, which means that Emacs can handle at most 2^14 (= 16384)
  composite characters at once.

  -----------------------------------------------------------------------
  charset		FIELD1 (5-bit)	    FIELD2&3 (14-bit)
  -----------------------------------------------------------------------
  CHARSET-COMPOSITION	0x1F		    CMPCHAR-ID
  -----------------------------------------------------------------------  

  Emacs assigns CMPCHAR-ID to a composite character only when it
  requires the character code of the composite character (e.g. while
  displaying the composite character).

*/

/* Masks of each field of character code.  */
#define CHAR_FIELD1_MASK (0x1F << 14)
#define CHAR_FIELD2_MASK (0x7F << 7)
#define CHAR_FIELD3_MASK 0x7F

/* Macros to access each field of character C.  */
#define CHAR_FIELD1(c) (((c) & CHAR_FIELD1_MASK) >> 14)
#define CHAR_FIELD2(c) (((c) & CHAR_FIELD2_MASK) >> 7)
#define CHAR_FIELD3(c) ((c) & CHAR_FIELD3_MASK)

/* Minimum character code of character of each DIMENSION.  */
#define MIN_CHAR_OFFICIAL_DIMENSION1 \
  ((MIN_CHARSET_OFFICIAL_DIMENSION1 - 0x70) << 7)
#define MIN_CHAR_PRIVATE_DIMENSION1 \
  ((MIN_CHARSET_PRIVATE_DIMENSION1 - 0x70) << 7)
#define MIN_CHAR_OFFICIAL_DIMENSION2 \
  ((MIN_CHARSET_OFFICIAL_DIMENSION2 - 0x8F) << 14)
#define MIN_CHAR_PRIVATE_DIMENSION2 \
  ((MIN_CHARSET_PRIVATE_DIMENSION2 - 0xE0) << 14)
#define MIN_CHAR_COMPOSITION \
  (0x1F << 14)
#define MAX_CHAR_COMPOSITION GLYPH_MASK_CHAR

/* 1 if C is an ASCII character, else 0.  */
#define SINGLE_BYTE_CHAR_P(c) ((c) < 0x100)
/* 1 if C is an composite character, else 0.  */
#define COMPOSITE_CHAR_P(c) ((c) >= MIN_CHAR_COMPOSITION)

/* 1 if BYTE is a character in itself, in multibyte mode.  */
#define ASCII_BYTE_P(byte) ((byte) < 0x80)

/* A char-table containing information of each character set.

   Unlike ordinary char-tables, this doesn't contain any nested table.
   Only the top level elements are used.  Each element is a vector of
   the following information:
	CHARSET-ID, BYTES, DIMENSION, CHARS, WIDTH, DIRECTION,
	LEADING-CODE-BASE, LEADING-CODE-EXT,
	ISO-FINAL-CHAR, ISO-GRAPHIC-PLANE,
	REVERSE-CHARSET, SHORT-NAME, LONG-NAME,	DESCRIPTION,
	PLIST.

   CHARSET-ID (integer) is the identification number of the charset.

   BYTE (integer) is the length of multi-byte form of a character in
   the charset: one of 1, 2, 3, and 4.

   DIMENSION (integer) is the number of bytes to represent a character: 1 or 2.

   CHARS (integer) is the number of characters in a dimension: 94 or 96.

   WIDTH (integer) is the number of columns a character in the charset
   occupies on the screen: one of 0, 1, and 2.

   DIRECTION (integer) is the rendering direction of characters in the
   charset when rendering.  If 0, render from right to left, else
   render from left to right.

   LEADING-CODE-BASE (integer) is the base leading-code for the
   charset.

   LEADING-CODE-EXT (integer) is the extended leading-code for the
   charset.  All charsets of less than 0xA0 has the value 0.

   ISO-FINAL-CHAR (character) is the final character of the
   corresponding ISO 2022 charset.

   ISO-GRAPHIC-PLANE (integer) is the graphic plane to be invoked
   while encoding to variants of ISO 2022 coding system, one of the
   following: 0/graphic-plane-left(GL), 1/graphic-plane-right(GR).

   REVERSE-CHARSET (integer) is the charset which differs only in
   LEFT-TO-RIGHT value from the charset.  If there's no such a
   charset, the value is -1.
   
   SHORT-NAME (string) is the short name to refer to the charset.

   LONG-NAME (string) is the long name to refer to the charset.

   DESCRIPTION (string) is the description string of the charset.

   PLIST (property list) may contain any type of information a user
   want to put and get by functions `put-charset-property' and
   `get-charset-property' respectively.  */
extern Lisp_Object Vcharset_table;

/* Macros to access various information of CHARSET in Vcharset_table.
   We provide these macros for efficiency.  No range check of CHARSET.  */

/* Return entry of CHARSET (lisp integer) in Vcharset_table.  */
#define CHARSET_TABLE_ENTRY(charset)					\
  XCHAR_TABLE (Vcharset_table)->contents[((charset) == CHARSET_ASCII	\
					  ? 0 : (charset) + 128)]

/* Return information INFO-IDX of CHARSET.  */
#define CHARSET_TABLE_INFO(charset, info_idx) \
  XVECTOR (CHARSET_TABLE_ENTRY (charset))->contents[info_idx]

#define CHARSET_ID_IDX (0)
#define CHARSET_BYTES_IDX (1)
#define CHARSET_DIMENSION_IDX (2)
#define CHARSET_CHARS_IDX (3)
#define CHARSET_WIDTH_IDX (4)
#define CHARSET_DIRECTION_IDX (5)
#define CHARSET_LEADING_CODE_BASE_IDX (6)
#define CHARSET_LEADING_CODE_EXT_IDX (7)
#define CHARSET_ISO_FINAL_CHAR_IDX (8)
#define CHARSET_ISO_GRAPHIC_PLANE_IDX (9)
#define CHARSET_REVERSE_CHARSET_IDX (10)
#define CHARSET_SHORT_NAME_IDX (11)
#define CHARSET_LONG_NAME_IDX (12)
#define CHARSET_DESCRIPTION_IDX (13)
#define CHARSET_PLIST_IDX (14)
/* Size of a vector of each entry of Vcharset_table.  */
#define CHARSET_MAX_IDX (15)

/* And several more macros to be used frequently.  */
#define CHARSET_BYTES(charset) \
  XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_BYTES_IDX))
#define CHARSET_DIMENSION(charset) \
  XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_DIMENSION_IDX))
#define CHARSET_CHARS(charset) \
  XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_CHARS_IDX))
#define CHARSET_WIDTH(charset) \
  XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_WIDTH_IDX))
#define CHARSET_DIRECTION(charset) \
  XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_DIRECTION_IDX))
#define CHARSET_LEADING_CODE_BASE(charset) \
  XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_LEADING_CODE_BASE_IDX))
#define CHARSET_LEADING_CODE_EXT(charset) \
  XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_LEADING_CODE_EXT_IDX))
#define CHARSET_ISO_FINAL_CHAR(charset) \
  XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_ISO_FINAL_CHAR_IDX))
#define CHARSET_ISO_GRAPHIC_PLANE(charset) \
  XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_ISO_GRAPHIC_PLANE_IDX))
#define CHARSET_REVERSE_CHARSET(charset) \
  XINT (CHARSET_TABLE_INFO (charset, CHARSET_REVERSE_CHARSET_IDX))

/* Macros to specify direction of a charset.  */
#define CHARSET_DIRECTION_LEFT_TO_RIGHT 0
#define CHARSET_DIRECTION_RIGHT_TO_LEFT 1

/* A vector of charset symbol indexed by charset-id.  This is used
   only for returning charset symbol from C functions.  */
extern Lisp_Object Vcharset_symbol_table;

/* Return symbol of CHARSET.  */
#define CHARSET_SYMBOL(charset) \
  XVECTOR (Vcharset_symbol_table)->contents[charset]

/* 1 if CHARSET is valid, else 0.  */
#define CHARSET_VALID_P(charset)					 \
  ((charset) == 0							 \
   || ((charset) >= 0x80 && (charset) <= MAX_CHARSET_OFFICIAL_DIMENSION2) \
   || ((charset) >= MIN_CHARSET_PRIVATE_DIMENSION1 && (charset) <= MAX_CHARSET))

/* 1 if CHARSET is already defined, else 0.  */
#define CHARSET_DEFINED_P(charset)			\
  (((charset) >= 0) && ((charset) <= MAX_CHARSET)	\
   && !NILP (CHARSET_TABLE_ENTRY (charset)))

/* Since the information CHARSET-BYTES and CHARSET-WIDTH of
   Vcharset_table can be retrieved only from the first byte of
   multi-byte form (an ASCII code or a base leading-code), we provide
   here tables to be used by macros BYTES_BY_CHAR_HEAD and
   WIDTH_BY_CHAR_HEAD for faster information retrieval.  */
extern int bytes_by_char_head[256];
extern int width_by_char_head[256];

#define BYTES_BY_CHAR_HEAD(char_head) bytes_by_char_head[char_head]
#define WIDTH_BY_CHAR_HEAD(char_head) width_by_char_head[char_head]

/* Charset of the character C.  */
#define CHAR_CHARSET(c)			 	\
  (SINGLE_BYTE_CHAR_P (c)		 	\
   ? CHARSET_ASCII			 	\
   : ((c) < MIN_CHAR_OFFICIAL_DIMENSION2 	\
      ? CHAR_FIELD2 (c) + 0x70		 	\
      : ((c) < MIN_CHAR_PRIVATE_DIMENSION2	\
	 ? CHAR_FIELD1 (c) + 0x8F	 	\
	 : ((c) < MIN_CHAR_COMPOSITION	 	\
	    ? CHAR_FIELD1 (c) + 0xE0	 	\
	    : ((c) <= MAX_CHAR_COMPOSITION	\
	       ? CHARSET_COMPOSITION		\
	       : CHARSET_ASCII)))))

/* Return charset at the place pointed by P.  */
#define CHARSET_AT(p)			   	\
  (*(p) < 0x80				   	\
   ? CHARSET_ASCII			   	\
   : (*(p) == LEADING_CODE_COMPOSITION	   	\
      ? CHARSET_COMPOSITION		   	\
      : (*(p) < LEADING_CODE_PRIVATE_11	   	\
	 ? (int)*(p)			   	\
	 : (*(p) <= LEADING_CODE_PRIVATE_22	\
	    ? (int)*((p) + 1)		   	\
	    : -1))))

/* Same as `CHARSET_AT ()' but perhaps runs faster because of an
   additional argument C which is the code (byte) at P.  */
#define FIRST_CHARSET_AT(p, c)		  	\
  ((c) < 0x80				  	\
   ? CHARSET_ASCII			  	\
   : ((c) == LEADING_CODE_COMPOSITION	  	\
      ? CHARSET_COMPOSITION		  	\
      : ((c) < LEADING_CODE_PRIVATE_11	  	\
	 ? (int)(c)			  	\
	 : ((c) <= LEADING_CODE_PRIVATE_22	\
	    ? (int)*((p) + 1)		  	\
	    : -1))))

/* Check if two characters C1 and C2 belong to the same charset.
   Always return 0 for composite characters.  */
#define SAME_CHARSET_P(c1, c2)				     	\
  (c1 < MIN_CHAR_COMPOSITION				     	\
   && (SINGLE_BYTE_CHAR_P (c1)				     	\
       ? SINGLE_BYTE_CHAR_P (c2)			     	\
       : (c1 < MIN_CHAR_OFFICIAL_DIMENSION2		     	\
	  ? (c1 & CHAR_FIELD2_MASK) == (c2 & CHAR_FIELD2_MASK)  \
	  : (c1 & CHAR_FIELD1_MASK) == (c2 & CHAR_FIELD1_MASK))))

/* Return a non-ASCII character of which charset is CHARSET and
   position-codes are C1 and C2.  DIMENSION1 character ignores C2.  */
#define MAKE_NON_ASCII_CHAR(charset, c1, c2)		    	\
  ((charset) == CHARSET_COMPOSITION			    	\
   ? MAKE_COMPOSITE_CHAR (((c1) << 7) + (c2))		    	\
   : (CHARSET_DIMENSION (charset) == 1			    	\
      ? (((charset) - 0x70) << 7) | (c1)		    	\
      : ((charset) < MIN_CHARSET_PRIVATE_DIMENSION2	    	\
	 ? (((charset) - 0x8F) << 14) | ((c1) << 7) | (c2)  	\
	 : (((charset) - 0xE0) << 14) | ((c1) << 7) | (c2))))

/* Return a composite character of which CMPCHAR-ID is ID.  */
#define MAKE_COMPOSITE_CHAR(id) (MIN_CHAR_COMPOSITION + (id))

/* Return CMPCHAR-ID of a composite character C.  */
#define COMPOSITE_CHAR_ID(c) ((c) - MIN_CHAR_COMPOSITION)

/* Return a character of which charset is CHARSET and position-codes
   are C1 and C2.  DIMENSION1 character ignores C2.  */
#define MAKE_CHAR(charset, c1, c2)		 	\
  ((charset) == CHARSET_ASCII			 	\
   ? (c1)					 	\
   : MAKE_NON_ASCII_CHAR ((charset), (c1) & 0x7F, (c2) & 0x7F))

/* If GENERICP is nonzero, return nonzero iff C is a valid normal or
   generic character.  If GENERICP is zero, return nonzero iff C is a
   valid normal character.  */
#define CHAR_VALID_P(c, genericp)	\
  ((c) >= 0				\
   && (SINGLE_BYTE_CHAR_P (c) || char_valid_p (c, genericp)))

/* This default value is used when nonascii-translate-table or
   nonascii-insert-offset fail to convert unibyte character to a valid
   multibyte character.  This makes a Latin-1 character.  */

#define DEFAULT_NONASCII_INSERT_OFFSET 0x800

/* Check if the character C is valid as a multibyte character.  */

#define VALID_MULTIBYTE_CHAR_P(c)					  \
  ((c) < MIN_CHAR_OFFICIAL_DIMENSION2					  \
   ? (!NILP (XCHAR_TABLE (Vcharset_table)->contents[CHAR_FIELD2 (c)	  \
						   + 0xF0])		  \
      && CHAR_FIELD3 (c) >= 32)						  \
   : ((c) < MIN_CHAR_PRIVATE_DIMENSION2					  \
      ? (!NILP (XCHAR_TABLE (Vcharset_table)->contents[CHAR_FIELD1 (c)	  \
						      + 0x10F])		  \
	 && CHAR_FIELD2 (c) >= 32 && CHAR_FIELD3 (c) >= 32)		  \
      : ((c) < MIN_CHAR_COMPOSITION					  \
	 ? (!NILP (XCHAR_TABLE (Vcharset_table)->contents[CHAR_FIELD1 (c) \
							 + 0x160])	  \
	    && CHAR_FIELD2 (c) >= 32 && CHAR_FIELD3 (c) >= 32)		  \
	 : (c) < MIN_CHAR_COMPOSITION + n_cmpchars)))

/* The charset of non-ASCII character C is stored in CHARSET, and the
   position-codes of C are stored in C1 and C2.
   We store -1 in C2 if the character is just 2 bytes.

   Do not use this macro for an ASCII character.  */

#define SPLIT_NON_ASCII_CHAR(c, charset, c1, c2)			 \
  ((c) < MIN_CHAR_OFFICIAL_DIMENSION2					 \
   ? (charset = CHAR_FIELD2 (c) + 0x70,					 \
      c1 = CHAR_FIELD3 (c),						 \
      c2 = -1)								 \
   : (charset = ((c) < MIN_CHAR_COMPOSITION				 \
		 ? (CHAR_FIELD1 (c)					 \
		    + ((c) < MIN_CHAR_PRIVATE_DIMENSION2 ? 0x8F : 0xE0)) \
		 : CHARSET_COMPOSITION),				 \
      c1 = CHAR_FIELD2 (c),						 \
      c2 = CHAR_FIELD3 (c)))

/* The charset of character C is stored in CHARSET, and the
   position-codes of C are stored in C1 and C2.
   We store -1 in C2 if the character is just 2 bytes.  */

#define SPLIT_CHAR(c, charset, c1, c2)		 	\
  (SINGLE_BYTE_CHAR_P (c)			 	\
   ? charset = CHARSET_ASCII, c1 = (c), c2 = -1	 	\
   : SPLIT_NON_ASCII_CHAR (c, charset, c1, c2))

/* The charset of the character at STR is stored in CHARSET, and the
   position-codes are stored in C1 and C2.
   We store -1 in C2 if the character is just 2 bytes.

   If the character is a composite character, the upper 7-bit and
   lower 7-bit of CMPCHAR-ID are set in C1 and C2 respectively.  No
   range checking.  */

#define SPLIT_STRING(str, len, charset, c1, c2)			      	\
  ((BYTES_BY_CHAR_HEAD ((unsigned char) *(str)) < 2		      	\
    || BYTES_BY_CHAR_HEAD ((unsigned char) *(str)) > len	      	\
    || split_non_ascii_string (str, len, &charset, &c1, &c2) < 0)	\
   ? c1 = *(str), charset = CHARSET_ASCII			      	\
   : charset)

/* Mapping table from ISO2022's charset (specified by DIMENSION,
   CHARS, and FINAL_CHAR) to Emacs' charset.  Should be accessed by
   macro ISO_CHARSET_TABLE (DIMENSION, CHARS, FINAL_CHAR).  */
extern int iso_charset_table[2][2][128];

#define ISO_CHARSET_TABLE(dimension, chars, final_char) \
  iso_charset_table[XINT (dimension) - 1][XINT (chars) > 94][XINT (final_char)]

#define BASE_LEADING_CODE_P(c) (BYTES_BY_CHAR_HEAD ((unsigned char) (c)) > 1)

/* The following two macros CHAR_STRING and STRING_CHAR are the main
   entry points to convert between Emacs two types of character
   representations: multi-byte form and single-word form (character
   code).  */

/* Set STR a pointer to the multi-byte form of the character C.  If C
   is not a composite character, the multi-byte form is set in WORKBUF
   and STR points WORKBUF.  The caller should allocate at least 4-byte
   area at WORKBUF in advance.  Returns the length of the multi-byte
   form.  If C is an invalid character code, signal an error.  */

#define CHAR_STRING(c, workbuf, str)		 	\
  (SINGLE_BYTE_CHAR_P (c)			 	\
   ? *(str = workbuf) = (unsigned char)(c), 1	 	\
   : non_ascii_char_to_string (c, workbuf, (unsigned char **)&str))

/* Return a character code of the character of which multi-byte form
   is at STR and the length is LEN.  If STR doesn't contain valid
   multi-byte form, only the first byte in STR is returned.  */

#define STRING_CHAR(str, len)				    	\
  ((BYTES_BY_CHAR_HEAD ((unsigned char) *(str)) == 1	    	\
    || BYTES_BY_CHAR_HEAD ((unsigned char) *(str)) > (len))	\
   ? (unsigned char) *(str)				    	\
   : string_to_non_ascii_char (str, len, 0))

/* This is like STRING_CHAR but the third arg ACTUAL_LEN is set to
   the length of the multi-byte form.  Just to know the length, use
   MULTIBYTE_FORM_LENGTH.  */

#define STRING_CHAR_AND_LENGTH(str, len, actual_len)	    	\
  ((BYTES_BY_CHAR_HEAD ((unsigned char) *(str)) == 1	    	\
    || BYTES_BY_CHAR_HEAD ((unsigned char) *(str)) > (len))	\
   ? (actual_len = 1), (unsigned char) *(str)		    	\
   : string_to_non_ascii_char (str, len, &actual_len))

/* Fetch the "next" multibyte character from Lisp string STRING
   at byte position BYTEIDX, character position CHARIDX.
   Store it into OUTPUT.

   All the args must be side-effect-free.
   BYTEIDX and CHARIDX must be lvalues;
   we increment them past the character fetched.  */

#define FETCH_STRING_CHAR_ADVANCE(OUTPUT, STRING, CHARIDX, BYTEIDX)	      \
if (1)									      \
  {									      \
    unsigned char *fetch_string_char_ptr = &XSTRING (STRING)->data[BYTEIDX];  \
    int fetch_string_char_space_left = XSTRING (STRING)->size_byte - BYTEIDX; \
    int actual_len;							      \
    									      \
    OUTPUT								      \
      = STRING_CHAR_AND_LENGTH (fetch_string_char_ptr,			      \
			        fetch_string_char_space_left, actual_len);    \
									      \
    BYTEIDX += actual_len;						      \
    CHARIDX++;								      \
  }									      \
else

/* Return the length of the multi-byte form at string STR of length LEN.  */

#define MULTIBYTE_FORM_LENGTH(str, len)			\
  (BYTES_BY_CHAR_HEAD (*(unsigned char *)(str)) == 1	\
   ? 1							\
   : multibyte_form_length (str, len))

/* Set C a (possibly multibyte) character at P.  P points into a
   string which is the virtual concatenation of STR1 (which ends at
   END1) or STR2 (which ends at END2).  */

#define GET_CHAR_AFTER_2(c, p, str1, end1, str2, end2)			    \
  do {									    \
    const char *dtemp = (p) == (end1) ? (str2) : (p);			    \
    const char *dlimit = ((p) >= (str1) && (p) < (end1)) ? (end1) : (end2); \
    c = STRING_CHAR (dtemp, dlimit - dtemp);				    \
  } while (0)

/* Set C a (possibly multibyte) character before P.  P points into a
   string which is the virtual concatenation of STR1 (which ends at
   END1) or STR2 (which ends at END2).  */

#define GET_CHAR_BEFORE_2(c, p, str1, end1, str2, end2)			    \
  do {									    \
    const char *dtemp = (p);						    \
    const char *dlimit = ((p) > (str2) && (p) <= (end2)) ? (str2) : (str1); \
    while (dtemp-- > dlimit && (unsigned char) *dtemp >= 0xA0);		    \
    c = STRING_CHAR (dtemp, p - dtemp);					    \
  } while (0)

#ifdef emacs

/* Increase the buffer point POS of the current buffer to the next
   character boundary.  This macro relies on the fact that *GPT_ADDR
   and *Z_ADDR are always accessible and the values are '\0'.  No
   range checking of POS.  */
#define INC_POS(pos)				\
  do {						\
    unsigned char *p = BYTE_POS_ADDR (pos);	\
    pos++;					\
    if (BASE_LEADING_CODE_P (*p++))		\
      while (!CHAR_HEAD_P (*p)) p++, pos++;	\
  } while (0)

/* Decrease the buffer point POS of the current buffer to the previous
   character boundary.  No range checking of POS.  */
#define DEC_POS(pos)						\
  do {								\
    unsigned char *p, *p_min;					\
    								\
    pos--;							\
    if (pos < GPT_BYTE)						\
      p = BEG_ADDR + pos - 1, p_min = BEG_ADDR;			\
    else							\
      p = BEG_ADDR + GAP_SIZE + pos - 1, p_min = GAP_END_ADDR;	\
    if (p > p_min && !CHAR_HEAD_P (*p))				\
      {								\
	int pos_saved = pos--;					\
	p--;							\
	while (p > p_min && !CHAR_HEAD_P (*p)) p--, pos--;	\
	if (!BASE_LEADING_CODE_P (*p)) pos = pos_saved;		\
      }								\
  } while (0)

/* Increment both CHARPOS and BYTEPOS, each in the appropriate way.  */

#define INC_BOTH(charpos, bytepos)				\
do								\
  {								\
    (charpos)++;						\
    if (NILP (current_buffer->enable_multibyte_characters))	\
      (bytepos)++;						\
    else							\
      INC_POS ((bytepos));					\
  }								\
while (0)

/* Decrement both CHARPOS and BYTEPOS, each in the appropriate way.  */

#define DEC_BOTH(charpos, bytepos)				\
do								\
  {								\
    (charpos)--;						\
    if (NILP (current_buffer->enable_multibyte_characters))	\
      (bytepos)--;						\
    else							\
      DEC_POS ((bytepos));					\
  }								\
while (0)

/* Increase the buffer point POS of the current buffer to the next
   character boundary.  This macro relies on the fact that *GPT_ADDR
   and *Z_ADDR are always accessible and the values are '\0'.  No
   range checking of POS.  */
#define BUF_INC_POS(buf, pos)				\
  do {							\
    unsigned char *p = BUF_BYTE_ADDRESS (buf, pos);	\
    pos++;						\
    if (BASE_LEADING_CODE_P (*p++))			\
      while (!CHAR_HEAD_P (*p)) p++, pos++;		\
  } while (0)

/* Decrease the buffer point POS of the current buffer to the previous
   character boundary.  No range checking of POS.  */
#define BUF_DEC_POS(buf, pos)				      	\
  do {							      	\
    unsigned char *p, *p_min;				      	\
    int pos_saved = --pos;				      	\
    if (pos < BUF_GPT_BYTE (buf))			      	\
      {								\
	p = BUF_BEG_ADDR (buf) + pos - 1;			\
	p_min = BUF_BEG_ADDR (buf);				\
      }								\
    else						      	\
      {								\
	p = BUF_BEG_ADDR (buf) + BUF_GAP_SIZE (buf) + pos - 1;	\
	p_min = BUF_GAP_END_ADDR (buf);				\
      }								\
    if (p > p_min && !CHAR_HEAD_P (*p))				\
      {								\
	int pos_saved = pos--;					\
	p--;							\
	while (p > p_min && !CHAR_HEAD_P (*p)) p--, pos--;	\
	if (!BASE_LEADING_CODE_P (*p)) pos = pos_saved;		\
      }								\
  } while (0)

#endif /* emacs */

/* Maximum counts of components in one composite character.  */
#define MAX_COMPONENT_COUNT 16

/* Structure to hold information of a composite character.  */
struct cmpchar_info {
  /* Byte length of the composite character.  */
  int len;

  /* Multi-byte form of the composite character.  */
  unsigned char *data;

  /* Length of glyph codes.  */
  int glyph_len;

  /* Width of the overall glyph of the composite character.  */
  int width;

  /* Pointer to an array of glyph codes of the composite character.
     This actually contains only character code, no face.  */
  GLYPH *glyph;

  /* Pointer to an array of composition rules.  The value has the form:
	(0xA0 + ((GLOBAL-REF-POINT << 2) | NEW-REF-POINT))
     where each XXX-REF-POINT is 0..8.  */
  unsigned char *cmp_rule;

  /* Pointer to an array of x-axis offset of left edge of glyphs
     relative to the left of of glyph[0] except for the first element
     which is the absolute offset from the left edge of overall glyph.
     The actual pixel offset should be calculated by multiplying each
     frame's one column width by this value:
	(i.e. FONT_WIDTH (f->output_data.x->font) * col_offset[N]).  */
  float *col_offset;

  /* Work slot used by `dumpglyphs' (xterm.c).  */
  int face_work;
};

/* Table of pointers to the structure `cmpchar_info' indexed by
   CMPCHAR-ID.  */
extern struct cmpchar_info **cmpchar_table;
/* Number of the current composite characters.  */
extern int n_cmpchars;

/* This is the maximum length of multi-byte form.  */
#define MAX_LENGTH_OF_MULTI_BYTE_FORM (MAX_COMPONENT_COUNT * 6)

/* Maximum character code currently used.  */
#define MAX_CHAR (MIN_CHAR_COMPOSITION + n_cmpchars)

extern void invalid_character P_ ((int));

extern int translate_char P_ ((Lisp_Object, int, int, int, int));
extern int split_non_ascii_string P_ ((const unsigned char *, int, int *,
				       unsigned char *, unsigned char *));
extern int string_to_non_ascii_char P_ ((const unsigned char *, int, int *));
extern int non_ascii_char_to_string P_ ((int, unsigned char *, unsigned char **));
extern int multibyte_form_length P_ ((const unsigned char *, int));
extern int str_cmpchar_id P_ ((const unsigned char *, int));
extern int get_charset_id P_ ((Lisp_Object));
extern int cmpchar_component P_ ((unsigned int, unsigned int));
extern int find_charset_in_str P_ ((unsigned char *, int, int *, Lisp_Object));
extern int strwidth P_ ((unsigned char *, int));

extern Lisp_Object Vcharacter_translation_table_vector;

/* Return a character translation table of id number ID.  */
#define GET_TRANSLATION_TABLE(id) \
  (XCONS(XVECTOR(Vcharacter_translation_table_vector)->contents[(id)])->cdr)

/* Copy LEN bytes from FROM to TO.  This macro should be used only
   when a caller knows that LEN is short and the obvious copy loop is
   faster than calling bcopy which has some overhead.  */

#define BCOPY_SHORT(from, to, len)		\
  do {						\
    int i = len;				\
    unsigined char *from_p = from, *to_p = to;	\
    while (i--) *from_p++ = *to_p++;		\
  } while (0)

#endif /* _CHARSET_H */
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.