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utf16.h
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1 /*
2 *******************************************************************************
3 *
4 * Copyright (C) 1999-2010, International Business Machines
5 * Corporation and others. All Rights Reserved.
6 *
7 *******************************************************************************
8 * file name: utf16.h
9 * encoding: US-ASCII
10 * tab size: 8 (not used)
11 * indentation:4
12 *
13 * created on: 1999sep09
14 * created by: Markus W. Scherer
15 */
16 
34 #ifndef __UTF16_H__
35 #define __UTF16_H__
36 
37 /* utf.h must be included first. */
38 #ifndef __UTF_H__
39 # include "unicode/utf.h"
40 #endif
41 
42 /* single-code point definitions -------------------------------------------- */
43 
50 #define U16_IS_SINGLE(c) !U_IS_SURROGATE(c)
51 
58 #define U16_IS_LEAD(c) (((c)&0xfffffc00)==0xd800)
59 
66 #define U16_IS_TRAIL(c) (((c)&0xfffffc00)==0xdc00)
67 
74 #define U16_IS_SURROGATE(c) U_IS_SURROGATE(c)
75 
83 #define U16_IS_SURROGATE_LEAD(c) (((c)&0x400)==0)
84 
92 #define U16_IS_SURROGATE_TRAIL(c) (((c)&0x400)!=0)
93 
98 #define U16_SURROGATE_OFFSET ((0xd800<<10UL)+0xdc00-0x10000)
99 
111 #define U16_GET_SUPPLEMENTARY(lead, trail) \
112  (((UChar32)(lead)<<10UL)+(UChar32)(trail)-U16_SURROGATE_OFFSET)
113 
114 
122 #define U16_LEAD(supplementary) (UChar)(((supplementary)>>10)+0xd7c0)
123 
131 #define U16_TRAIL(supplementary) (UChar)(((supplementary)&0x3ff)|0xdc00)
132 
140 #define U16_LENGTH(c) ((uint32_t)(c)<=0xffff ? 1 : 2)
141 
147 #define U16_MAX_LENGTH 2
148 
166 #define U16_GET_UNSAFE(s, i, c) { \
167  (c)=(s)[i]; \
168  if(U16_IS_SURROGATE(c)) { \
169  if(U16_IS_SURROGATE_LEAD(c)) { \
170  (c)=U16_GET_SUPPLEMENTARY((c), (s)[(i)+1]); \
171  } else { \
172  (c)=U16_GET_SUPPLEMENTARY((s)[(i)-1], (c)); \
173  } \
174  } \
175 }
176 
197 #define U16_GET(s, start, i, length, c) { \
198  (c)=(s)[i]; \
199  if(U16_IS_SURROGATE(c)) { \
200  uint16_t __c2; \
201  if(U16_IS_SURROGATE_LEAD(c)) { \
202  if((i)+1<(length) && U16_IS_TRAIL(__c2=(s)[(i)+1])) { \
203  (c)=U16_GET_SUPPLEMENTARY((c), __c2); \
204  } \
205  } else { \
206  if((i)>(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \
207  (c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \
208  } \
209  } \
210  } \
211 }
212 
213 /* definitions with forward iteration --------------------------------------- */
214 
234 #define U16_NEXT_UNSAFE(s, i, c) { \
235  (c)=(s)[(i)++]; \
236  if(U16_IS_LEAD(c)) { \
237  (c)=U16_GET_SUPPLEMENTARY((c), (s)[(i)++]); \
238  } \
239 }
240 
261 #define U16_NEXT(s, i, length, c) { \
262  (c)=(s)[(i)++]; \
263  if(U16_IS_LEAD(c)) { \
264  uint16_t __c2; \
265  if((i)<(length) && U16_IS_TRAIL(__c2=(s)[(i)])) { \
266  ++(i); \
267  (c)=U16_GET_SUPPLEMENTARY((c), __c2); \
268  } \
269  } \
270 }
271 
285 #define U16_APPEND_UNSAFE(s, i, c) { \
286  if((uint32_t)(c)<=0xffff) { \
287  (s)[(i)++]=(uint16_t)(c); \
288  } else { \
289  (s)[(i)++]=(uint16_t)(((c)>>10)+0xd7c0); \
290  (s)[(i)++]=(uint16_t)(((c)&0x3ff)|0xdc00); \
291  } \
292 }
293 
311 #define U16_APPEND(s, i, capacity, c, isError) { \
312  if((uint32_t)(c)<=0xffff) { \
313  (s)[(i)++]=(uint16_t)(c); \
314  } else if((uint32_t)(c)<=0x10ffff && (i)+1<(capacity)) { \
315  (s)[(i)++]=(uint16_t)(((c)>>10)+0xd7c0); \
316  (s)[(i)++]=(uint16_t)(((c)&0x3ff)|0xdc00); \
317  } else /* c>0x10ffff or not enough space */ { \
318  (isError)=TRUE; \
319  } \
320 }
321 
332 #define U16_FWD_1_UNSAFE(s, i) { \
333  if(U16_IS_LEAD((s)[(i)++])) { \
334  ++(i); \
335  } \
336 }
337 
349 #define U16_FWD_1(s, i, length) { \
350  if(U16_IS_LEAD((s)[(i)++]) && (i)<(length) && U16_IS_TRAIL((s)[i])) { \
351  ++(i); \
352  } \
353 }
354 
367 #define U16_FWD_N_UNSAFE(s, i, n) { \
368  int32_t __N=(n); \
369  while(__N>0) { \
370  U16_FWD_1_UNSAFE(s, i); \
371  --__N; \
372  } \
373 }
374 
388 #define U16_FWD_N(s, i, length, n) { \
389  int32_t __N=(n); \
390  while(__N>0 && (i)<(length)) { \
391  U16_FWD_1(s, i, length); \
392  --__N; \
393  } \
394 }
395 
409 #define U16_SET_CP_START_UNSAFE(s, i) { \
410  if(U16_IS_TRAIL((s)[i])) { \
411  --(i); \
412  } \
413 }
414 
429 #define U16_SET_CP_START(s, start, i) { \
430  if(U16_IS_TRAIL((s)[i]) && (i)>(start) && U16_IS_LEAD((s)[(i)-1])) { \
431  --(i); \
432  } \
433 }
434 
435 /* definitions with backward iteration -------------------------------------- */
436 
457 #define U16_PREV_UNSAFE(s, i, c) { \
458  (c)=(s)[--(i)]; \
459  if(U16_IS_TRAIL(c)) { \
460  (c)=U16_GET_SUPPLEMENTARY((s)[--(i)], (c)); \
461  } \
462 }
463 
485 #define U16_PREV(s, start, i, c) { \
486  (c)=(s)[--(i)]; \
487  if(U16_IS_TRAIL(c)) { \
488  uint16_t __c2; \
489  if((i)>(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \
490  --(i); \
491  (c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \
492  } \
493  } \
494 }
495 
507 #define U16_BACK_1_UNSAFE(s, i) { \
508  if(U16_IS_TRAIL((s)[--(i)])) { \
509  --(i); \
510  } \
511 }
512 
525 #define U16_BACK_1(s, start, i) { \
526  if(U16_IS_TRAIL((s)[--(i)]) && (i)>(start) && U16_IS_LEAD((s)[(i)-1])) { \
527  --(i); \
528  } \
529 }
530 
544 #define U16_BACK_N_UNSAFE(s, i, n) { \
545  int32_t __N=(n); \
546  while(__N>0) { \
547  U16_BACK_1_UNSAFE(s, i); \
548  --__N; \
549  } \
550 }
551 
566 #define U16_BACK_N(s, start, i, n) { \
567  int32_t __N=(n); \
568  while(__N>0 && (i)>(start)) { \
569  U16_BACK_1(s, start, i); \
570  --__N; \
571  } \
572 }
573 
587 #define U16_SET_CP_LIMIT_UNSAFE(s, i) { \
588  if(U16_IS_LEAD((s)[(i)-1])) { \
589  ++(i); \
590  } \
591 }
592 
608 #define U16_SET_CP_LIMIT(s, start, i, length) { \
609  if((start)<(i) && (i)<(length) && U16_IS_LEAD((s)[(i)-1]) && U16_IS_TRAIL((s)[i])) { \
610  ++(i); \
611  } \
612 }
613 
614 #endif
C API: Code point macros.