icuSources/common/uchar.c

   1 /*
   2 ********************************************************************************
   3 *   Copyright (C) 1996-2012, International Business Machines
   4 *   Corporation and others.  All Rights Reserved.
   5 ********************************************************************************
   6 *
   7 * File UCHAR.C
   8 *
   9 * Modification History:
  10 *
  11 *   Date        Name        Description
  12 *   04/02/97    aliu        Creation.
  13 *   4/15/99     Madhu       Updated all the function definitions for C Implementation
  14 *   5/20/99     Madhu       Added the function u_getVersion()
  15 *   8/19/1999   srl         Upgraded scripts to Unicode3.0
  16 *   11/11/1999  weiv        added u_isalnum(), cleaned comments
  17 *   01/11/2000  helena      Renamed u_getVersion to u_getUnicodeVersion.
  18 *   06/20/2000  helena      OS/400 port changes; mostly typecast.
  19 ******************************************************************************
  20 */
  21
  22 #include "unicode/utypes.h"
  23 #include "unicode/uchar.h"
  24 #include "unicode/uscript.h"
  25 #include "unicode/udata.h"
  26 #include "uassert.h"
  27 #include "cmemory.h"
  28 #include "ucln_cmn.h"
  29 #include "utrie2.h"
  30 #include "udataswp.h"
  31 #include "uprops.h"
  32 #include "ustr_imp.h"
  33
  34 #define LENGTHOF(array) (int32_t)(sizeof(array)/sizeof((array)[0]))
  35
  36 /* uchar_props_data.h is machine-generated by genprops --csource */
  37 #define INCLUDED_FROM_UCHAR_C
  38 #include "uchar_props_data.h"
  39
  40 /* constants and macros for access to the data ------------------------------ */
  41
  42 /* getting a uint32_t properties word from the data */
  43 #define GET_PROPS(c, result) ((result)=UTRIE2_GET16(&propsTrie, c));
  44
  45 U_CFUNC UBool
  46 uprv_haveProperties(UErrorCode *pErrorCode) {
  47     if(U_FAILURE(*pErrorCode)) {
  48         return FALSE;
  49     }
  50     return TRUE;
  51 }
  52
  53 /* API functions ------------------------------------------------------------ */
  54
  55 /* Gets the Unicode character's general category.*/
  56 U_CAPI int8_t U_EXPORT2
  57 u_charType(UChar32 c) {
  58     uint32_t props;
  59     GET_PROPS(c, props);
  60     return (int8_t)GET_CATEGORY(props);
  61 }
  62
  63 /* Enumerate all code points with their general categories. */
  64 struct _EnumTypeCallback {
  65     UCharEnumTypeRange *enumRange;
  66     const void *context;
  67 };
  68
  69 static uint32_t U_CALLCONV
  70 _enumTypeValue(const void *context, uint32_t value) {
  71     return GET_CATEGORY(value);
  72 }
  73
  74 static UBool U_CALLCONV
  75 _enumTypeRange(const void *context, UChar32 start, UChar32 end, uint32_t value) {
  76     /* just cast the value to UCharCategory */
  77     return ((struct _EnumTypeCallback *)context)->
  78         enumRange(((struct _EnumTypeCallback *)context)->context,
  79                   start, end+1, (UCharCategory)value);
  80 }
  81
  82 U_CAPI void U_EXPORT2
  83 u_enumCharTypes(UCharEnumTypeRange *enumRange, const void *context) {
  84     struct _EnumTypeCallback callback;
  85
  86     if(enumRange==NULL) {
  87         return;
  88     }
  89
  90     callback.enumRange=enumRange;
  91     callback.context=context;
  92     utrie2_enum(&propsTrie, _enumTypeValue, _enumTypeRange, &callback);
  93 }
  94
  95 /* Checks if ch is a lower case letter.*/
  96 U_CAPI UBool U_EXPORT2
  97 u_islower(UChar32 c) {
  98     uint32_t props;
  99     GET_PROPS(c, props);
 100     return (UBool)(GET_CATEGORY(props)==U_LOWERCASE_LETTER);
 101 }
 102
 103 /* Checks if ch is an upper case letter.*/
 104 U_CAPI UBool U_EXPORT2
 105 u_isupper(UChar32 c) {
 106     uint32_t props;
 107     GET_PROPS(c, props);
 108     return (UBool)(GET_CATEGORY(props)==U_UPPERCASE_LETTER);
 109 }
 110
 111 /* Checks if ch is a title case letter; usually upper case letters.*/
 112 U_CAPI UBool U_EXPORT2
 113 u_istitle(UChar32 c) {
 114     uint32_t props;
 115     GET_PROPS(c, props);
 116     return (UBool)(GET_CATEGORY(props)==U_TITLECASE_LETTER);
 117 }
 118
 119 /* Checks if ch is a decimal digit. */
 120 U_CAPI UBool U_EXPORT2
 121 u_isdigit(UChar32 c) {
 122     uint32_t props;
 123     GET_PROPS(c, props);
 124     return (UBool)(GET_CATEGORY(props)==U_DECIMAL_DIGIT_NUMBER);
 125 }
 126
 127 U_CAPI UBool U_EXPORT2
 128 u_isxdigit(UChar32 c) {
 129     uint32_t props;
 130
 131     /* check ASCII and Fullwidth ASCII a-fA-F */
 132     if(
 133         (c<=0x66 && c>=0x41 && (c<=0x46 || c>=0x61)) ||
 134         (c>=0xff21 && c<=0xff46 && (c<=0xff26 || c>=0xff41))
 135     ) {
 136         return TRUE;
 137     }
 138
 139     GET_PROPS(c, props);
 140     return (UBool)(GET_CATEGORY(props)==U_DECIMAL_DIGIT_NUMBER);
 141 }
 142
 143 /* Checks if the Unicode character is a letter.*/
 144 U_CAPI UBool U_EXPORT2
 145 u_isalpha(UChar32 c) {
 146     uint32_t props;
 147     GET_PROPS(c, props);
 148     return (UBool)((CAT_MASK(props)&U_GC_L_MASK)!=0);
 149 }
 150
 151 U_CAPI UBool U_EXPORT2
 152 u_isUAlphabetic(UChar32 c) {
 153     return (u_getUnicodeProperties(c, 1)&U_MASK(UPROPS_ALPHABETIC))!=0;
 154 }
 155
 156 /* Checks if c is a letter or a decimal digit */
 157 U_CAPI UBool U_EXPORT2
 158 u_isalnum(UChar32 c) {
 159     uint32_t props;
 160     GET_PROPS(c, props);
 161     return (UBool)((CAT_MASK(props)&(U_GC_L_MASK|U_GC_ND_MASK))!=0);
 162 }
 163
 164 /**
 165  * Checks if c is alphabetic, or a decimal digit; implements UCHAR_POSIX_ALNUM.
 166  * @internal
 167  */
 168 U_CFUNC UBool
 169 u_isalnumPOSIX(UChar32 c) {
 170     return (UBool)(u_isUAlphabetic(c) || u_isdigit(c));
 171 }
 172
 173 /* Checks if ch is a unicode character with assigned character type.*/
 174 U_CAPI UBool U_EXPORT2
 175 u_isdefined(UChar32 c) {
 176     uint32_t props;
 177     GET_PROPS(c, props);
 178     return (UBool)(GET_CATEGORY(props)!=0);
 179 }
 180
 181 /* Checks if the Unicode character is a base form character that can take a diacritic.*/
 182 U_CAPI UBool U_EXPORT2
 183 u_isbase(UChar32 c) {
 184     uint32_t props;
 185     GET_PROPS(c, props);
 186     return (UBool)((CAT_MASK(props)&(U_GC_L_MASK|U_GC_N_MASK|U_GC_MC_MASK|U_GC_ME_MASK))!=0);
 187 }
 188
 189 /* Checks if the Unicode character is a control character.*/
 190 U_CAPI UBool U_EXPORT2
 191 u_iscntrl(UChar32 c) {
 192     uint32_t props;
 193     GET_PROPS(c, props);
 194     return (UBool)((CAT_MASK(props)&(U_GC_CC_MASK|U_GC_CF_MASK|U_GC_ZL_MASK|U_GC_ZP_MASK))!=0);
 195 }
 196
 197 U_CAPI UBool U_EXPORT2
 198 u_isISOControl(UChar32 c) {
 199     return (uint32_t)c<=0x9f && (c<=0x1f || c>=0x7f);
 200 }
 201
 202 /* Some control characters that are used as space. */
 203 #define IS_THAT_CONTROL_SPACE(c) \
 204     (c<=0x9f && ((c>=TAB && c<=CR) || (c>=0x1c && c <=0x1f) || c==NL))
 205
 206 /* Java has decided that U+0085 New Line is not whitespace any more. */
 207 #define IS_THAT_ASCII_CONTROL_SPACE(c) \
 208     (c<=0x1f && c>=TAB && (c<=CR || c>=0x1c))
 209
 210 /* Checks if the Unicode character is a space character.*/
 211 U_CAPI UBool U_EXPORT2
 212 u_isspace(UChar32 c) {
 213     uint32_t props;
 214     GET_PROPS(c, props);
 215     return (UBool)((CAT_MASK(props)&U_GC_Z_MASK)!=0 || IS_THAT_CONTROL_SPACE(c));
 216 }
 217
 218 U_CAPI UBool U_EXPORT2
 219 u_isJavaSpaceChar(UChar32 c) {
 220     uint32_t props;
 221     GET_PROPS(c, props);
 222     return (UBool)((CAT_MASK(props)&U_GC_Z_MASK)!=0);
 223 }
 224
 225 /* Checks if the Unicode character is a whitespace character.*/
 226 U_CAPI UBool U_EXPORT2
 227 u_isWhitespace(UChar32 c) {
 228     uint32_t props;
 229     GET_PROPS(c, props);
 230     return (UBool)(
 231                 ((CAT_MASK(props)&U_GC_Z_MASK)!=0 &&
 232                     c!=NBSP && c!=FIGURESP && c!=NNBSP) || /* exclude no-break spaces */
 233                 IS_THAT_ASCII_CONTROL_SPACE(c)
 234            );
 235 }
 236
 237 U_CAPI UBool U_EXPORT2
 238 u_isblank(UChar32 c) {
 239     if((uint32_t)c<=0x9f) {
 240         return c==9 || c==0x20; /* TAB or SPACE */
 241     } else {
 242         /* Zs */
 243         uint32_t props;
 244         GET_PROPS(c, props);
 245         return (UBool)(GET_CATEGORY(props)==U_SPACE_SEPARATOR);
 246     }
 247 }
 248
 249 U_CAPI UBool U_EXPORT2
 250 u_isUWhiteSpace(UChar32 c) {
 251     return (u_getUnicodeProperties(c, 1)&U_MASK(UPROPS_WHITE_SPACE))!=0;
 252 }
 253
 254 /* Checks if the Unicode character is printable.*/
 255 U_CAPI UBool U_EXPORT2
 256 u_isprint(UChar32 c) {
 257     uint32_t props;
 258     GET_PROPS(c, props);
 259     /* comparing ==0 returns FALSE for the categories mentioned */
 260     return (UBool)((CAT_MASK(props)&U_GC_C_MASK)==0);
 261 }
 262
 263 /**
 264  * Checks if c is in \p{graph}\p{blank} - \p{cntrl}.
 265  * Implements UCHAR_POSIX_PRINT.
 266  * @internal
 267  */
 268 U_CFUNC UBool
 269 u_isprintPOSIX(UChar32 c) {
 270     uint32_t props;
 271     GET_PROPS(c, props);
 272     /*
 273      * The only cntrl character in graph+blank is TAB (in blank).
 274      * Here we implement (blank-TAB)=Zs instead of calling u_isblank().
 275      */
 276     return (UBool)((GET_CATEGORY(props)==U_SPACE_SEPARATOR) || u_isgraphPOSIX(c));
 277 }
 278
 279 U_CAPI UBool U_EXPORT2
 280 u_isgraph(UChar32 c) {
 281     uint32_t props;
 282     GET_PROPS(c, props);
 283     /* comparing ==0 returns FALSE for the categories mentioned */
 284     return (UBool)((CAT_MASK(props)&
 285                     (U_GC_CC_MASK|U_GC_CF_MASK|U_GC_CS_MASK|U_GC_CN_MASK|U_GC_Z_MASK))
 286                    ==0);
 287 }
 288
 289 /**
 290  * Checks if c is in
 291  * [^\p{space}\p{gc=Control}\p{gc=Surrogate}\p{gc=Unassigned}]
 292  * with space=\p{Whitespace} and Control=Cc.
 293  * Implements UCHAR_POSIX_GRAPH.
 294  * @internal
 295  */
 296 U_CFUNC UBool
 297 u_isgraphPOSIX(UChar32 c) {
 298     uint32_t props;
 299     GET_PROPS(c, props);
 300     /* \p{space}\p{gc=Control} == \p{gc=Z}\p{Control} */
 301     /* comparing ==0 returns FALSE for the categories mentioned */
 302     return (UBool)((CAT_MASK(props)&
 303                     (U_GC_CC_MASK|U_GC_CS_MASK|U_GC_CN_MASK|U_GC_Z_MASK))
 304                    ==0);
 305 }
 306
 307 U_CAPI UBool U_EXPORT2
 308 u_ispunct(UChar32 c) {
 309     uint32_t props;
 310     GET_PROPS(c, props);
 311     return (UBool)((CAT_MASK(props)&U_GC_P_MASK)!=0);
 312 }
 313
 314 /* Checks if the Unicode character can start a Unicode identifier.*/
 315 U_CAPI UBool U_EXPORT2
 316 u_isIDStart(UChar32 c) {
 317     /* same as u_isalpha() */
 318     uint32_t props;
 319     GET_PROPS(c, props);
 320     return (UBool)((CAT_MASK(props)&(U_GC_L_MASK|U_GC_NL_MASK))!=0);
 321 }
 322
 323 /* Checks if the Unicode character can be a Unicode identifier part other than starting the
 324  identifier.*/
 325 U_CAPI UBool U_EXPORT2
 326 u_isIDPart(UChar32 c) {
 327     uint32_t props;
 328     GET_PROPS(c, props);
 329     return (UBool)(
 330            (CAT_MASK(props)&
 331             (U_GC_ND_MASK|U_GC_NL_MASK|
 332              U_GC_L_MASK|
 333              U_GC_PC_MASK|U_GC_MC_MASK|U_GC_MN_MASK)
 334            )!=0 ||
 335            u_isIDIgnorable(c));
 336 }
 337
 338 /*Checks if the Unicode character can be ignorable in a Java or Unicode identifier.*/
 339 U_CAPI UBool U_EXPORT2
 340 u_isIDIgnorable(UChar32 c) {
 341     if(c<=0x9f) {
 342         return u_isISOControl(c) && !IS_THAT_ASCII_CONTROL_SPACE(c);
 343     } else {
 344         uint32_t props;
 345         GET_PROPS(c, props);
 346         return (UBool)(GET_CATEGORY(props)==U_FORMAT_CHAR);
 347     }
 348 }
 349
 350 /*Checks if the Unicode character can start a Java identifier.*/
 351 U_CAPI UBool U_EXPORT2
 352 u_isJavaIDStart(UChar32 c) {
 353     uint32_t props;
 354     GET_PROPS(c, props);
 355     return (UBool)((CAT_MASK(props)&(U_GC_L_MASK|U_GC_SC_MASK|U_GC_PC_MASK))!=0);
 356 }
 357
 358 /*Checks if the Unicode character can be a Java identifier part other than starting the
 359  * identifier.
 360  */
 361 U_CAPI UBool U_EXPORT2
 362 u_isJavaIDPart(UChar32 c) {
 363     uint32_t props;
 364     GET_PROPS(c, props);
 365     return (UBool)(
 366            (CAT_MASK(props)&
 367             (U_GC_ND_MASK|U_GC_NL_MASK|
 368              U_GC_L_MASK|
 369              U_GC_SC_MASK|U_GC_PC_MASK|
 370              U_GC_MC_MASK|U_GC_MN_MASK)
 371            )!=0 ||
 372            u_isIDIgnorable(c));
 373 }
 374
 375 U_CAPI int32_t U_EXPORT2
 376 u_charDigitValue(UChar32 c) {
 377     uint32_t props;
 378     int32_t value;
 379     GET_PROPS(c, props);
 380     value=(int32_t)GET_NUMERIC_TYPE_VALUE(props)-UPROPS_NTV_DECIMAL_START;
 381     if(value<=9) {
 382         return value;
 383     } else {
 384         return -1;
 385     }
 386 }
 387
 388 U_CAPI double U_EXPORT2
 389 u_getNumericValue(UChar32 c) {
 390     uint32_t props;
 391     int32_t ntv;
 392     GET_PROPS(c, props);
 393     ntv=(int32_t)GET_NUMERIC_TYPE_VALUE(props);
 394
 395     if(ntv==UPROPS_NTV_NONE) {
 396         return U_NO_NUMERIC_VALUE;
 397     } else if(ntv<UPROPS_NTV_DIGIT_START) {
 398         /* decimal digit */
 399         return ntv-UPROPS_NTV_DECIMAL_START;
 400     } else if(ntv<UPROPS_NTV_NUMERIC_START) {
 401         /* other digit */
 402         return ntv-UPROPS_NTV_DIGIT_START;
 403     } else if(ntv<UPROPS_NTV_FRACTION_START) {
 404         /* small integer */
 405         return ntv-UPROPS_NTV_NUMERIC_START;
 406     } else if(ntv<UPROPS_NTV_LARGE_START) {
 407         /* fraction */
 408         int32_t numerator=(ntv>>4)-12;
 409         int32_t denominator=(ntv&0xf)+1;
 410         return (double)numerator/denominator;
 411     } else if(ntv<UPROPS_NTV_BASE60_START) {
 412         /* large, single-significant-digit integer */
 413         double numValue;
 414         int32_t mant=(ntv>>5)-14;
 415         int32_t exp=(ntv&0x1f)+2;
 416         numValue=mant;
 417
 418         /* multiply by 10^exp without math.h */
 419         while(exp>=4) {
 420             numValue*=10000.;
 421             exp-=4;
 422         }
 423         switch(exp) {
 424         case 3:
 425             numValue*=1000.;
 426             break;
 427         case 2:
 428             numValue*=100.;
 429             break;
 430         case 1:
 431             numValue*=10.;
 432             break;
 433         case 0:
 434         default:
 435             break;
 436         }
 437
 438         return numValue;
 439     } else if(ntv<UPROPS_NTV_RESERVED_START) {
 440         /* sexagesimal (base 60) integer */
 441         int32_t numValue=(ntv>>2)-0xbf;
 442         int32_t exp=(ntv&3)+1;
 443
 444         switch(exp) {
 445         case 4:
 446             numValue*=60*60*60*60;
 447             break;
 448         case 3:
 449             numValue*=60*60*60;
 450             break;
 451         case 2:
 452             numValue*=60*60;
 453             break;
 454         case 1:
 455             numValue*=60;
 456             break;
 457         case 0:
 458         default:
 459             break;
 460         }
 461
 462         return numValue;
 463     } else {
 464         /* reserved */
 465         return U_NO_NUMERIC_VALUE;
 466     }
 467 }
 468
 469 U_CAPI int32_t U_EXPORT2
 470 u_digit(UChar32 ch, int8_t radix) {
 471     int8_t value;
 472     if((uint8_t)(radix-2)<=(36-2)) {
 473         value=(int8_t)u_charDigitValue(ch);
 474         if(value<0) {
 475             /* ch is not a decimal digit, try latin letters */
 476             if(ch>=0x61 && ch<=0x7A) {
 477                 value=(int8_t)(ch-0x57);  /* ch - 'a' + 10 */
 478             } else if(ch>=0x41 && ch<=0x5A) {
 479                 value=(int8_t)(ch-0x37);  /* ch - 'A' + 10 */
 480             } else if(ch>=0xFF41 && ch<=0xFF5A) {
 481                 value=(int8_t)(ch-0xFF37);  /* fullwidth ASCII a-z */
 482             } else if(ch>=0xFF21 && ch<=0xFF3A) {
 483                 value=(int8_t)(ch-0xFF17);  /* fullwidth ASCII A-Z */
 484             }
 485         }
 486     } else {
 487         value=-1;   /* invalid radix */
 488     }
 489     return (int8_t)((value<radix) ? value : -1);
 490 }
 491
 492 U_CAPI UChar32 U_EXPORT2
 493 u_forDigit(int32_t digit, int8_t radix) {
 494     if((uint8_t)(radix-2)>(36-2) || (uint32_t)digit>=(uint32_t)radix) {
 495         return 0;
 496     } else if(digit<10) {
 497         return (UChar32)(0x30+digit);
 498     } else {
 499         return (UChar32)((0x61-10)+digit);
 500     }
 501 }
 502
 503 /* miscellaneous, and support for uprops.cpp -------------------------------- */
 504
 505 U_CAPI void U_EXPORT2
 506 u_getUnicodeVersion(UVersionInfo versionArray) {
 507     if(versionArray!=NULL) {
 508         uprv_memcpy(versionArray, dataVersion, U_MAX_VERSION_LENGTH);
 509     }
 510 }
 511
 512 U_CFUNC uint32_t
 513 u_getMainProperties(UChar32 c) {
 514     uint32_t props;
 515     GET_PROPS(c, props);
 516     return props;
 517 }
 518
 519 U_CFUNC uint32_t
 520 u_getUnicodeProperties(UChar32 c, int32_t column) {
 521     U_ASSERT(column>=0);
 522     if(column>=propsVectorsColumns) {
 523         return 0;
 524     } else {
 525         uint16_t vecIndex=UTRIE2_GET16(&propsVectorsTrie, c);
 526         return propsVectors[vecIndex+column];
 527     }
 528 }
 529
 530 U_CFUNC int32_t
 531 uprv_getMaxValues(int32_t column) {
 532     switch(column) {
 533     case 0:
 534         return indexes[UPROPS_MAX_VALUES_INDEX];
 535     case 2:
 536         return indexes[UPROPS_MAX_VALUES_2_INDEX];
 537     default:
 538         return 0;
 539     }
 540 }
 541
 542 U_CAPI void U_EXPORT2
 543 u_charAge(UChar32 c, UVersionInfo versionArray) {
 544     if(versionArray!=NULL) {
 545         uint32_t version=u_getUnicodeProperties(c, 0)>>UPROPS_AGE_SHIFT;
 546         versionArray[0]=(uint8_t)(version>>4);
 547         versionArray[1]=(uint8_t)(version&0xf);
 548         versionArray[2]=versionArray[3]=0;
 549     }
 550 }
 551
 552 U_CAPI UScriptCode U_EXPORT2
 553 uscript_getScript(UChar32 c, UErrorCode *pErrorCode) {
 554     uint32_t scriptX;
 555     if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
 556         return USCRIPT_INVALID_CODE;
 557     }
 558     if((uint32_t)c>0x10ffff) {
 559         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
 560         return USCRIPT_INVALID_CODE;
 561     }
 562     scriptX=u_getUnicodeProperties(c, 0)&UPROPS_SCRIPT_X_MASK;
 563     if(scriptX<UPROPS_SCRIPT_X_WITH_COMMON) {
 564         return (UScriptCode)scriptX;
 565     } else if(scriptX<UPROPS_SCRIPT_X_WITH_INHERITED) {
 566         return USCRIPT_COMMON;
 567     } else if(scriptX<UPROPS_SCRIPT_X_WITH_OTHER) {
 568         return USCRIPT_INHERITED;
 569     } else {
 570         return (UScriptCode)scriptExtensions[scriptX&UPROPS_SCRIPT_MASK];
 571     }
 572 }
 573
 574 U_CAPI UBool U_EXPORT2
 575 uscript_hasScript(UChar32 c, UScriptCode sc) {
 576     const uint16_t *scx;
 577     uint32_t scriptX=u_getUnicodeProperties(c, 0)&UPROPS_SCRIPT_X_MASK;
 578     if(scriptX<UPROPS_SCRIPT_X_WITH_COMMON) {
 579         return sc==(UScriptCode)scriptX;
 580     }
 581
 582     scx=scriptExtensions+(scriptX&UPROPS_SCRIPT_MASK);
 583     if(scriptX>=UPROPS_SCRIPT_X_WITH_OTHER) {
 584         scx=scriptExtensions+scx[1];
 585     }
 586     if(sc>=USCRIPT_CODE_LIMIT) {
 587         /* Guard against bogus input that would make us go past the Script_Extensions terminator. */
 588         return FALSE;
 589     }
 590     while(sc>*scx) {
 591         ++scx;
 592     }
 593     return sc==(*scx&0x7fff);
 594 }
 595
 596 U_CAPI int32_t U_EXPORT2
 597 uscript_getScriptExtensions(UChar32 c,
 598                             UScriptCode *scripts, int32_t capacity,
 599                             UErrorCode *pErrorCode) {
 600     uint32_t scriptX;
 601     int32_t length;
 602     const uint16_t *scx;
 603     uint16_t sx;
 604     if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
 605         return 0;
 606     }
 607     if(capacity<0 || (capacity>0 && scripts==NULL)) {
 608         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
 609         return 0;
 610     }
 611     scriptX=u_getUnicodeProperties(c, 0)&UPROPS_SCRIPT_X_MASK;
 612     if(scriptX<UPROPS_SCRIPT_X_WITH_COMMON) {
 613         if(capacity==0) {
 614             *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
 615         } else {
 616             scripts[0]=(UScriptCode)scriptX;
 617         }
 618         return 1;
 619     }
 620
 621     scx=scriptExtensions+(scriptX&UPROPS_SCRIPT_MASK);
 622     if(scriptX>=UPROPS_SCRIPT_X_WITH_OTHER) {
 623         scx=scriptExtensions+scx[1];
 624     }
 625     length=0;
 626     do {
 627         sx=*scx++;
 628         if(length<capacity) {
 629             scripts[length]=(UScriptCode)(sx&0x7fff);
 630         }
 631         ++length;
 632     } while(sx<0x8000);
 633     if(length>capacity) {
 634         *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
 635     }
 636     return length;
 637 }
 638
 639 U_CAPI UBlockCode U_EXPORT2
 640 ublock_getCode(UChar32 c) {
 641     return (UBlockCode)((u_getUnicodeProperties(c, 0)&UPROPS_BLOCK_MASK)>>UPROPS_BLOCK_SHIFT);
 642 }
 643
 644 /* property starts for UnicodeSet ------------------------------------------- */
 645
 646 static UBool U_CALLCONV
 647 _enumPropertyStartsRange(const void *context, UChar32 start, UChar32 end, uint32_t value) {
 648     /* add the start code point to the USet */
 649     const USetAdder *sa=(const USetAdder *)context;
 650     sa->add(sa->set, start);
 651     return TRUE;
 652 }
 653
 654 #define USET_ADD_CP_AND_NEXT(sa, cp) sa->add(sa->set, cp); sa->add(sa->set, cp+1)
 655
 656 U_CFUNC void U_EXPORT2
 657 uchar_addPropertyStarts(const USetAdder *sa, UErrorCode *pErrorCode) {
 658     if(U_FAILURE(*pErrorCode)) {
 659         return;
 660     }
 661
 662     /* add the start code point of each same-value range of the main trie */
 663     utrie2_enum(&propsTrie, NULL, _enumPropertyStartsRange, sa);
 664
 665     /* add code points with hardcoded properties, plus the ones following them */
 666
 667     /* add for u_isblank() */
 668     USET_ADD_CP_AND_NEXT(sa, TAB);
 669
 670     /* add for IS_THAT_CONTROL_SPACE() */
 671     sa->add(sa->set, CR+1); /* range TAB..CR */
 672     sa->add(sa->set, 0x1c);
 673     sa->add(sa->set, 0x1f+1);
 674     USET_ADD_CP_AND_NEXT(sa, NL);
 675
 676     /* add for u_isIDIgnorable() what was not added above */
 677     sa->add(sa->set, DEL); /* range DEL..NBSP-1, NBSP added below */
 678     sa->add(sa->set, HAIRSP);
 679     sa->add(sa->set, RLM+1);
 680     sa->add(sa->set, INHSWAP);
 681     sa->add(sa->set, NOMDIG+1);
 682     USET_ADD_CP_AND_NEXT(sa, ZWNBSP);
 683
 684     /* add no-break spaces for u_isWhitespace() what was not added above */
 685     USET_ADD_CP_AND_NEXT(sa, NBSP);
 686     USET_ADD_CP_AND_NEXT(sa, FIGURESP);
 687     USET_ADD_CP_AND_NEXT(sa, NNBSP);
 688
 689     /* add for u_digit() */
 690     sa->add(sa->set, U_a);
 691     sa->add(sa->set, U_z+1);
 692     sa->add(sa->set, U_A);
 693     sa->add(sa->set, U_Z+1);
 694     sa->add(sa->set, U_FW_a);
 695     sa->add(sa->set, U_FW_z+1);
 696     sa->add(sa->set, U_FW_A);
 697     sa->add(sa->set, U_FW_Z+1);
 698
 699     /* add for u_isxdigit() */
 700     sa->add(sa->set, U_f+1);
 701     sa->add(sa->set, U_F+1);
 702     sa->add(sa->set, U_FW_f+1);
 703     sa->add(sa->set, U_FW_F+1);
 704
 705     /* add for UCHAR_DEFAULT_IGNORABLE_CODE_POINT what was not added above */
 706     sa->add(sa->set, WJ); /* range WJ..NOMDIG */
 707     sa->add(sa->set, 0xfff0);
 708     sa->add(sa->set, 0xfffb+1);
 709     sa->add(sa->set, 0xe0000);
 710     sa->add(sa->set, 0xe0fff+1);
 711
 712     /* add for UCHAR_GRAPHEME_BASE and others */
 713     USET_ADD_CP_AND_NEXT(sa, CGJ);
 714 }
 715
 716 U_CFUNC void U_EXPORT2
 717 upropsvec_addPropertyStarts(const USetAdder *sa, UErrorCode *pErrorCode) {
 718     if(U_FAILURE(*pErrorCode)) {
 719         return;
 720     }
 721
 722     /* add the start code point of each same-value range of the properties vectors trie */
 723     if(propsVectorsColumns>0) {
 724         /* if propsVectorsColumns==0 then the properties vectors trie may not be there at all */
 725         utrie2_enum(&propsVectorsTrie, NULL, _enumPropertyStartsRange, sa);
 726     }
 727 }