ICU 63.1  63.1
utf16.h
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1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 *******************************************************************************
5 *
6 * Copyright (C) 1999-2012, International Business Machines
7 * Corporation and others. All Rights Reserved.
8 *
9 *******************************************************************************
10 * file name: utf16.h
11 * encoding: UTF-8
12 * tab size: 8 (not used)
13 * indentation:4
14 *
15 * created on: 1999sep09
16 * created by: Markus W. Scherer
17 */
18 
34 #ifndef __UTF16_H__
35 #define __UTF16_H__
36 
37 #include "unicode/umachine.h"
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 
200 #define U16_GET(s, start, i, length, c) { \
201  (c)=(s)[i]; \
202  if(U16_IS_SURROGATE(c)) { \
203  uint16_t __c2; \
204  if(U16_IS_SURROGATE_LEAD(c)) { \
205  if((i)+1!=(length) && U16_IS_TRAIL(__c2=(s)[(i)+1])) { \
206  (c)=U16_GET_SUPPLEMENTARY((c), __c2); \
207  } \
208  } else { \
209  if((i)>(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \
210  (c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \
211  } \
212  } \
213  } \
214 }
215 
239 #define U16_GET_OR_FFFD(s, start, i, length, c) { \
240  (c)=(s)[i]; \
241  if(U16_IS_SURROGATE(c)) { \
242  uint16_t __c2; \
243  if(U16_IS_SURROGATE_LEAD(c)) { \
244  if((i)+1!=(length) && U16_IS_TRAIL(__c2=(s)[(i)+1])) { \
245  (c)=U16_GET_SUPPLEMENTARY((c), __c2); \
246  } else { \
247  (c)=0xfffd; \
248  } \
249  } else { \
250  if((i)>(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \
251  (c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \
252  } else { \
253  (c)=0xfffd; \
254  } \
255  } \
256  } \
257 }
258 
259 /* definitions with forward iteration --------------------------------------- */
260 
280 #define U16_NEXT_UNSAFE(s, i, c) { \
281  (c)=(s)[(i)++]; \
282  if(U16_IS_LEAD(c)) { \
283  (c)=U16_GET_SUPPLEMENTARY((c), (s)[(i)++]); \
284  } \
285 }
286 
308 #define U16_NEXT(s, i, length, c) { \
309  (c)=(s)[(i)++]; \
310  if(U16_IS_LEAD(c)) { \
311  uint16_t __c2; \
312  if((i)!=(length) && U16_IS_TRAIL(__c2=(s)[(i)])) { \
313  ++(i); \
314  (c)=U16_GET_SUPPLEMENTARY((c), __c2); \
315  } \
316  } \
317 }
318 
340 #define U16_NEXT_OR_FFFD(s, i, length, c) { \
341  (c)=(s)[(i)++]; \
342  if(U16_IS_SURROGATE(c)) { \
343  uint16_t __c2; \
344  if(U16_IS_SURROGATE_LEAD(c) && (i)!=(length) && U16_IS_TRAIL(__c2=(s)[(i)])) { \
345  ++(i); \
346  (c)=U16_GET_SUPPLEMENTARY((c), __c2); \
347  } else { \
348  (c)=0xfffd; \
349  } \
350  } \
351 }
352 
366 #define U16_APPEND_UNSAFE(s, i, c) { \
367  if((uint32_t)(c)<=0xffff) { \
368  (s)[(i)++]=(uint16_t)(c); \
369  } else { \
370  (s)[(i)++]=(uint16_t)(((c)>>10)+0xd7c0); \
371  (s)[(i)++]=(uint16_t)(((c)&0x3ff)|0xdc00); \
372  } \
373 }
374 
392 #define U16_APPEND(s, i, capacity, c, isError) { \
393  if((uint32_t)(c)<=0xffff) { \
394  (s)[(i)++]=(uint16_t)(c); \
395  } else if((uint32_t)(c)<=0x10ffff && (i)+1<(capacity)) { \
396  (s)[(i)++]=(uint16_t)(((c)>>10)+0xd7c0); \
397  (s)[(i)++]=(uint16_t)(((c)&0x3ff)|0xdc00); \
398  } else /* c>0x10ffff or not enough space */ { \
399  (isError)=TRUE; \
400  } \
401 }
402 
413 #define U16_FWD_1_UNSAFE(s, i) { \
414  if(U16_IS_LEAD((s)[(i)++])) { \
415  ++(i); \
416  } \
417 }
418 
432 #define U16_FWD_1(s, i, length) { \
433  if(U16_IS_LEAD((s)[(i)++]) && (i)!=(length) && U16_IS_TRAIL((s)[i])) { \
434  ++(i); \
435  } \
436 }
437 
450 #define U16_FWD_N_UNSAFE(s, i, n) { \
451  int32_t __N=(n); \
452  while(__N>0) { \
453  U16_FWD_1_UNSAFE(s, i); \
454  --__N; \
455  } \
456 }
457 
473 #define U16_FWD_N(s, i, length, n) { \
474  int32_t __N=(n); \
475  while(__N>0 && ((i)<(length) || ((length)<0 && (s)[i]!=0))) { \
476  U16_FWD_1(s, i, length); \
477  --__N; \
478  } \
479 }
480 
494 #define U16_SET_CP_START_UNSAFE(s, i) { \
495  if(U16_IS_TRAIL((s)[i])) { \
496  --(i); \
497  } \
498 }
499 
514 #define U16_SET_CP_START(s, start, i) { \
515  if(U16_IS_TRAIL((s)[i]) && (i)>(start) && U16_IS_LEAD((s)[(i)-1])) { \
516  --(i); \
517  } \
518 }
519 
520 /* definitions with backward iteration -------------------------------------- */
521 
542 #define U16_PREV_UNSAFE(s, i, c) { \
543  (c)=(s)[--(i)]; \
544  if(U16_IS_TRAIL(c)) { \
545  (c)=U16_GET_SUPPLEMENTARY((s)[--(i)], (c)); \
546  } \
547 }
548 
569 #define U16_PREV(s, start, i, c) { \
570  (c)=(s)[--(i)]; \
571  if(U16_IS_TRAIL(c)) { \
572  uint16_t __c2; \
573  if((i)>(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \
574  --(i); \
575  (c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \
576  } \
577  } \
578 }
579 
600 #define U16_PREV_OR_FFFD(s, start, i, c) { \
601  (c)=(s)[--(i)]; \
602  if(U16_IS_SURROGATE(c)) { \
603  uint16_t __c2; \
604  if(U16_IS_SURROGATE_TRAIL(c) && (i)>(start) && U16_IS_LEAD(__c2=(s)[(i)-1])) { \
605  --(i); \
606  (c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \
607  } else { \
608  (c)=0xfffd; \
609  } \
610  } \
611 }
612 
624 #define U16_BACK_1_UNSAFE(s, i) { \
625  if(U16_IS_TRAIL((s)[--(i)])) { \
626  --(i); \
627  } \
628 }
629 
642 #define U16_BACK_1(s, start, i) { \
643  if(U16_IS_TRAIL((s)[--(i)]) && (i)>(start) && U16_IS_LEAD((s)[(i)-1])) { \
644  --(i); \
645  } \
646 }
647 
661 #define U16_BACK_N_UNSAFE(s, i, n) { \
662  int32_t __N=(n); \
663  while(__N>0) { \
664  U16_BACK_1_UNSAFE(s, i); \
665  --__N; \
666  } \
667 }
668 
683 #define U16_BACK_N(s, start, i, n) { \
684  int32_t __N=(n); \
685  while(__N>0 && (i)>(start)) { \
686  U16_BACK_1(s, start, i); \
687  --__N; \
688  } \
689 }
690 
704 #define U16_SET_CP_LIMIT_UNSAFE(s, i) { \
705  if(U16_IS_LEAD((s)[(i)-1])) { \
706  ++(i); \
707  } \
708 }
709 
727 #define U16_SET_CP_LIMIT(s, start, i, length) { \
728  if((start)<(i) && ((i)<(length) || (length)<0) && U16_IS_LEAD((s)[(i)-1]) && U16_IS_TRAIL((s)[i])) { \
729  ++(i); \
730  } \
731 }
732 
733 #endif
Basic types and constants for UTF.
C API: Code point macros.