CFCalendar.c

   1 /*
   2  * Copyright (c) 2009 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*      CFCalendar.c
  25         Copyright 2004-2004, Apple Computer, Inc. All rights reserved.
  26         Responsibility: Christopher Kane
  27 */
  28
  29
  30
  31 #include <CoreFoundation/CFCalendar.h>
  32 #include <CoreFoundation/CFRuntime.h>
  33 #include "CFInternal.h"
  34 #include "CFPriv.h"
  35 #include <unicode/ucal.h>
  36
  37 #define BUFFER_SIZE 512
  38
  39 struct __CFCalendar {
  40     CFRuntimeBase _base;
  41     CFStringRef _identifier;    // canonical identifier, never NULL
  42     CFLocaleRef _locale;
  43     CFStringRef _localeID;
  44     CFTimeZoneRef _tz;
  45     UCalendar *_cal;
  46 };
  47
  48 static Boolean __CFCalendarEqual(CFTypeRef cf1, CFTypeRef cf2) {
  49     CFCalendarRef calendar1 = (CFCalendarRef)cf1;
  50     CFCalendarRef calendar2 = (CFCalendarRef)cf2;
  51     return CFEqual(calendar1->_identifier, calendar2->_identifier);
  52 }
  53
  54 static CFHashCode __CFCalendarHash(CFTypeRef cf) {
  55     CFCalendarRef calendar = (CFCalendarRef)cf;
  56     return CFHash(calendar->_identifier);
  57 }
  58
  59 static CFStringRef __CFCalendarCopyDescription(CFTypeRef cf) {
  60     CFCalendarRef calendar = (CFCalendarRef)cf;
  61     return CFStringCreateWithFormat(CFGetAllocator(calendar), NULL, CFSTR("<CFCalendar %p [%p]>{identifier = '%@'}"), cf, CFGetAllocator(calendar), calendar->_identifier);
  62 }
  63
  64 static void __CFCalendarDeallocate(CFTypeRef cf) {
  65     CFCalendarRef calendar = (CFCalendarRef)cf;
  66     CFRelease(calendar->_identifier);
  67     if (calendar->_locale) CFRelease(calendar->_locale);
  68     if (calendar->_localeID) CFRelease(calendar->_localeID);
  69     CFRelease(calendar->_tz);
  70     if (calendar->_cal) ucal_close(calendar->_cal);
  71 }
  72
  73 static CFTypeID __kCFCalendarTypeID = _kCFRuntimeNotATypeID;
  74
  75 static const CFRuntimeClass __CFCalendarClass = {
  76     0,
  77     "CFCalendar",
  78     NULL,       // init
  79     NULL,       // copy
  80     __CFCalendarDeallocate,
  81     __CFCalendarEqual,
  82     __CFCalendarHash,
  83     NULL,       //
  84     __CFCalendarCopyDescription
  85 };
  86
  87 static void __CFCalendarInitialize(void) {
  88     __kCFCalendarTypeID = _CFRuntimeRegisterClass(&__CFCalendarClass);
  89 }
  90
  91 CFTypeID CFCalendarGetTypeID(void) {
  92     if (_kCFRuntimeNotATypeID == __kCFCalendarTypeID) __CFCalendarInitialize();
  93     return __kCFCalendarTypeID;
  94 }
  95
  96 __private_extern__ UCalendar *__CFCalendarCreateUCalendar(CFStringRef calendarID, CFStringRef localeID, CFTimeZoneRef tz) {
  97     if (calendarID) {
  98         CFDictionaryRef components = CFLocaleCreateComponentsFromLocaleIdentifier(kCFAllocatorSystemDefault, localeID);
  99         CFMutableDictionaryRef mcomponents = CFDictionaryCreateMutableCopy(kCFAllocatorSystemDefault, 0, components);
 100         CFDictionarySetValue(mcomponents, kCFLocaleCalendarIdentifier, calendarID);
 101         localeID = CFLocaleCreateLocaleIdentifierFromComponents(kCFAllocatorSystemDefault, mcomponents);
 102         CFRelease(mcomponents);
 103         CFRelease(components);
 104     }
 105
 106     char buffer[BUFFER_SIZE];
 107     const char *cstr = CFStringGetCStringPtr(localeID, kCFStringEncodingASCII);
 108     if (NULL == cstr) {
 109         if (CFStringGetCString(localeID, buffer, BUFFER_SIZE, kCFStringEncodingASCII)) cstr = buffer;
 110     }
 111     if (NULL == cstr) {
 112         if (calendarID) CFRelease(localeID);
 113         return NULL;
 114     }
 115
 116     UChar ubuffer[BUFFER_SIZE];
 117     CFStringRef tznam = CFTimeZoneGetName(tz);
 118     CFIndex cnt = CFStringGetLength(tznam);
 119     if (BUFFER_SIZE < cnt) cnt = BUFFER_SIZE;
 120     CFStringGetCharacters(tznam, CFRangeMake(0, cnt), (UniChar *)ubuffer);
 121
 122     UErrorCode status = U_ZERO_ERROR;
 123     UCalendar *cal = ucal_open(ubuffer, cnt, cstr, UCAL_TRADITIONAL, &status);
 124     if (calendarID) CFRelease(localeID);
 125     return cal;
 126 }
 127
 128 static void __CFCalendarSetupCal(CFCalendarRef calendar) {
 129     calendar->_cal = __CFCalendarCreateUCalendar(calendar->_identifier, calendar->_localeID, calendar->_tz);
 130 }
 131
 132 static void __CFCalendarZapCal(CFCalendarRef calendar) {
 133     ucal_close(calendar->_cal);
 134     calendar->_cal = NULL;
 135 }
 136
 137 CFCalendarRef CFCalendarCopyCurrent(void) {
 138     CFLocaleRef locale = CFLocaleCopyCurrent();
 139     CFCalendarRef calID = (CFCalendarRef)CFLocaleGetValue(locale, kCFLocaleCalendarIdentifier);
 140     if (calID) {
 141         CFCalendarRef calendar = CFCalendarCreateWithIdentifier(kCFAllocatorSystemDefault, (CFStringRef)calID);
 142         CFCalendarSetLocale(calendar, locale);
 143         CFRelease(locale);
 144         return calendar;
 145     }
 146     return NULL;
 147 }
 148
 149 CFCalendarRef CFCalendarCreateWithIdentifier(CFAllocatorRef allocator, CFStringRef identifier) {
 150     if (allocator == NULL) allocator = __CFGetDefaultAllocator();
 151     __CFGenericValidateType(allocator, CFAllocatorGetTypeID());
 152     __CFGenericValidateType(identifier, CFStringGetTypeID());
 153     // return NULL until Chinese calendar is available
 154     if (identifier != kCFGregorianCalendar && identifier != kCFBuddhistCalendar && identifier != kCFJapaneseCalendar && identifier != kCFIslamicCalendar && identifier != kCFIslamicCivilCalendar && identifier != kCFHebrewCalendar) {
 155 //    if (identifier != kCFGregorianCalendar && identifier != kCFBuddhistCalendar && identifier != kCFJapaneseCalendar && identifier != kCFIslamicCalendar && identifier != kCFIslamicCivilCalendar && identifier != kCFHebrewCalendar && identifier != kCFChineseCalendar) {
 156         if (CFEqual(kCFGregorianCalendar, identifier)) identifier = kCFGregorianCalendar;
 157         else if (CFEqual(kCFBuddhistCalendar, identifier)) identifier = kCFBuddhistCalendar;
 158         else if (CFEqual(kCFJapaneseCalendar, identifier)) identifier = kCFJapaneseCalendar;
 159         else if (CFEqual(kCFIslamicCalendar, identifier)) identifier = kCFIslamicCalendar;
 160         else if (CFEqual(kCFIslamicCivilCalendar, identifier)) identifier = kCFIslamicCivilCalendar;
 161         else if (CFEqual(kCFHebrewCalendar, identifier)) identifier = kCFHebrewCalendar;
 162 //      else if (CFEqual(kCFChineseCalendar, identifier)) identifier = kCFChineseCalendar;
 163         else return NULL;
 164     }
 165     struct __CFCalendar *calendar = NULL;
 166     uint32_t size = sizeof(struct __CFCalendar) - sizeof(CFRuntimeBase);
 167     calendar = (struct __CFCalendar *)_CFRuntimeCreateInstance(allocator, CFCalendarGetTypeID(), size, NULL);
 168     if (NULL == calendar) {
 169         return NULL;
 170     }
 171     calendar->_identifier = (CFStringRef)CFRetain(identifier);
 172     calendar->_locale = NULL;
 173     calendar->_localeID = CFLocaleGetIdentifier(CFLocaleGetSystem());
 174     calendar->_tz = CFTimeZoneCopyDefault();
 175     calendar->_cal = NULL;
 176     return (CFCalendarRef)calendar;
 177 }
 178
 179 CFStringRef CFCalendarGetIdentifier(CFCalendarRef calendar) {
 180     CF_OBJC_FUNCDISPATCH0(CFCalendarGetTypeID(), CFStringRef, calendar, "calendarIdentifier");
 181     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 182     return calendar->_identifier;
 183 }
 184
 185 CFLocaleRef CFCalendarCopyLocale(CFCalendarRef calendar) {
 186     CF_OBJC_FUNCDISPATCH0(CFCalendarGetTypeID(), CFLocaleRef, calendar, "_copyLocale");
 187     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 188     return (CFLocaleRef)CFLocaleCreate(kCFAllocatorSystemDefault, calendar->_localeID);
 189 }
 190
 191 void CFCalendarSetLocale(CFCalendarRef calendar, CFLocaleRef locale) {
 192     CF_OBJC_FUNCDISPATCH1(CFCalendarGetTypeID(), void, calendar, "setLocale:", locale);
 193     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 194     __CFGenericValidateType(locale, CFLocaleGetTypeID());
 195     CFStringRef localeID = CFLocaleGetIdentifier(locale);
 196     if (localeID != calendar->_localeID) {
 197         CFRelease(calendar->_localeID);
 198         CFRetain(localeID);
 199         calendar->_localeID = localeID;
 200         if (calendar->_cal) __CFCalendarZapCal(calendar);
 201     }
 202 }
 203
 204 CFTimeZoneRef CFCalendarCopyTimeZone(CFCalendarRef calendar) {
 205     CF_OBJC_FUNCDISPATCH0(CFCalendarGetTypeID(), CFTimeZoneRef, calendar, "_copyTimeZone");
 206     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 207     return (CFTimeZoneRef)CFRetain(calendar->_tz);
 208 }
 209
 210 void CFCalendarSetTimeZone(CFCalendarRef calendar, CFTimeZoneRef tz) {
 211     CF_OBJC_FUNCDISPATCH1(CFCalendarGetTypeID(), void, calendar, "setTimeZone:", tz);
 212     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 213     if (tz) __CFGenericValidateType(tz, CFTimeZoneGetTypeID());
 214     if (tz != calendar->_tz) {
 215         CFRelease(calendar->_tz);
 216         calendar->_tz = tz ? (CFTimeZoneRef)CFRetain(tz) : CFTimeZoneCopyDefault();
 217         if (calendar->_cal) __CFCalendarZapCal(calendar);
 218     }
 219 }
 220
 221 CFIndex CFCalendarGetFirstWeekday(CFCalendarRef calendar) {
 222     CF_OBJC_FUNCDISPATCH0(CFCalendarGetTypeID(), CFIndex, calendar, "firstWeekday");
 223     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 224     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 225     if (calendar->_cal) {
 226         return ucal_getAttribute(calendar->_cal, UCAL_FIRST_DAY_OF_WEEK);
 227     }
 228     return -1;
 229 }
 230
 231 void CFCalendarSetFirstWeekday(CFCalendarRef calendar, CFIndex wkdy) {
 232     CF_OBJC_FUNCDISPATCH1(CFCalendarGetTypeID(), void, calendar, "setFirstWeekday:", wkdy);
 233     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 234     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 235     if (calendar->_cal) {
 236         ucal_setAttribute(calendar->_cal, UCAL_FIRST_DAY_OF_WEEK, wkdy);
 237     }
 238 }
 239
 240 CFIndex CFCalendarGetMinimumDaysInFirstWeek(CFCalendarRef calendar) {
 241     CF_OBJC_FUNCDISPATCH0(CFCalendarGetTypeID(), CFIndex, calendar, "minimumDaysInFirstWeek");
 242     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 243     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 244     return calendar->_cal ? ucal_getAttribute(calendar->_cal, UCAL_MINIMAL_DAYS_IN_FIRST_WEEK) : -1;
 245 }
 246
 247 void CFCalendarSetMinimumDaysInFirstWeek(CFCalendarRef calendar, CFIndex mwd) {
 248     CF_OBJC_FUNCDISPATCH1(CFCalendarGetTypeID(), void, calendar, "setMinimumDaysInFirstWeek:", mwd);
 249     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 250     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 251     if (calendar->_cal) ucal_setAttribute(calendar->_cal, UCAL_MINIMAL_DAYS_IN_FIRST_WEEK, mwd);
 252 }
 253
 254 CFDateRef CFCalendarCopyGregorianStartDate(CFCalendarRef calendar) {
 255     CF_OBJC_FUNCDISPATCH0(CFCalendarGetTypeID(), CFDateRef, calendar, "_gregorianStartDate");
 256     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 257     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 258     UErrorCode status = U_ZERO_ERROR;
 259     UDate udate = calendar->_cal ? ucal_getGregorianChange(calendar->_cal, &status) : 0;
 260     if (calendar->_cal && U_SUCCESS(status)) {
 261         CFAbsoluteTime at = (double)udate / 1000.0 - kCFAbsoluteTimeIntervalSince1970;
 262         return CFDateCreate(CFGetAllocator(calendar), at);
 263     }
 264     return NULL;
 265 }
 266
 267 void CFCalendarSetGregorianStartDate(CFCalendarRef calendar, CFDateRef date) {
 268     CF_OBJC_FUNCDISPATCH1(CFCalendarGetTypeID(), void, calendar, "_setGregorianStartDate:", date);
 269     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 270     if (date) __CFGenericValidateType(date, CFDateGetTypeID());
 271     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 272     if (!calendar->_cal) return;
 273     if (!date) {
 274         UErrorCode status = U_ZERO_ERROR;
 275         UCalendar *cal = __CFCalendarCreateUCalendar(calendar->_identifier, calendar->_localeID, calendar->_tz);
 276         UDate udate = cal ? ucal_getGregorianChange(cal, &status) : 0;
 277         if (cal && U_SUCCESS(status)) {
 278             status = U_ZERO_ERROR;
 279             if (calendar->_cal) ucal_setGregorianChange(calendar->_cal, udate, &status);
 280         }
 281         if (cal) ucal_close(cal);
 282     } else {
 283         CFAbsoluteTime at = CFDateGetAbsoluteTime(date);
 284         UDate udate = (at + kCFAbsoluteTimeIntervalSince1970) * 1000.0;
 285         UErrorCode status = U_ZERO_ERROR;
 286         if (calendar->_cal) ucal_setGregorianChange(calendar->_cal, udate, &status);
 287     }
 288 }
 289
 290
 291 static UCalendarDateFields __CFCalendarGetICUFieldCode(CFCalendarUnit unit) {
 292     switch (unit) {
 293     case kCFCalendarUnitEra: return UCAL_ERA;
 294     case kCFCalendarUnitYear: return UCAL_YEAR;
 295     case kCFCalendarUnitMonth: return UCAL_MONTH;
 296     case kCFCalendarUnitDay: return UCAL_DAY_OF_MONTH;
 297     case kCFCalendarUnitHour: return UCAL_HOUR_OF_DAY;
 298     case kCFCalendarUnitMinute: return UCAL_MINUTE;
 299     case kCFCalendarUnitSecond: return UCAL_SECOND;
 300     case kCFCalendarUnitWeek: return UCAL_WEEK_OF_YEAR;
 301     case kCFCalendarUnitWeekday: return UCAL_DAY_OF_WEEK;
 302     case kCFCalendarUnitWeekdayOrdinal: return UCAL_DAY_OF_WEEK_IN_MONTH;
 303     }
 304     return (UCalendarDateFields)-1;
 305 }
 306
 307 static UCalendarDateFields __CFCalendarGetICUFieldCodeFromChar(char ch) {
 308     switch (ch) {
 309     case 'G': return UCAL_ERA;
 310     case 'y': return UCAL_YEAR;
 311     case 'M': return UCAL_MONTH;
 312     case 'd': return UCAL_DAY_OF_MONTH;
 313     case 'h': return UCAL_HOUR;
 314     case 'H': return UCAL_HOUR_OF_DAY;
 315     case 'm': return UCAL_MINUTE;
 316     case 's': return UCAL_SECOND;
 317     case 'S': return UCAL_MILLISECOND;
 318     case 'w': return UCAL_WEEK_OF_YEAR;
 319     case 'W': return UCAL_WEEK_OF_MONTH;
 320     case 'E': return UCAL_DAY_OF_WEEK;
 321     case 'D': return UCAL_DAY_OF_YEAR;
 322     case 'F': return UCAL_DAY_OF_WEEK_IN_MONTH;
 323     case 'a': return UCAL_AM_PM;
 324     case 'g': return UCAL_JULIAN_DAY;
 325     }
 326     return (UCalendarDateFields)-1;
 327 }
 328
 329 static UCalendarDateFields __CFCalendarGetCalendarUnitFromChar(char ch) {
 330     switch (ch) {
 331     case 'G': return (UCalendarDateFields)kCFCalendarUnitEra;
 332     case 'y': return (UCalendarDateFields)kCFCalendarUnitYear;
 333     case 'M': return (UCalendarDateFields)kCFCalendarUnitMonth;
 334     case 'd': return (UCalendarDateFields)kCFCalendarUnitDay;
 335     case 'H': return (UCalendarDateFields)kCFCalendarUnitHour;
 336     case 'm': return (UCalendarDateFields)kCFCalendarUnitMinute;
 337     case 's': return (UCalendarDateFields)kCFCalendarUnitSecond;
 338     case 'w': return (UCalendarDateFields)kCFCalendarUnitWeek;
 339     case 'E': return (UCalendarDateFields)kCFCalendarUnitWeekday;
 340     case 'F': return (UCalendarDateFields)kCFCalendarUnitWeekdayOrdinal;
 341     }
 342     return (UCalendarDateFields)-1;
 343 }
 344
 345 CFRange CFCalendarGetMinimumRangeOfUnit(CFCalendarRef calendar, CFCalendarUnit unit) {
 346     CF_OBJC_FUNCDISPATCH1(CFCalendarGetTypeID(), CFRange, calendar, "_minimumRangeOfUnit:", unit);
 347     CFRange range = {kCFNotFound, kCFNotFound};
 348     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 349     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 350     if (calendar->_cal) {
 351         ucal_clear(calendar->_cal);
 352         UCalendarDateFields field = __CFCalendarGetICUFieldCode(unit);
 353         UErrorCode status = U_ZERO_ERROR;
 354         range.location = ucal_getLimit(calendar->_cal, field, UCAL_GREATEST_MINIMUM, &status);
 355         range.length = ucal_getLimit(calendar->_cal, field, UCAL_LEAST_MAXIMUM, &status) - range.location + 1;
 356         if (UCAL_MONTH == field) range.location++;
 357         if (100000 < range.length) range.length = 100000;
 358     }
 359     return range;
 360 }
 361
 362 CFRange CFCalendarGetMaximumRangeOfUnit(CFCalendarRef calendar, CFCalendarUnit unit) {
 363     CF_OBJC_FUNCDISPATCH1(CFCalendarGetTypeID(), CFRange, calendar, "_maximumRangeOfUnit:", unit);
 364     CFRange range = {kCFNotFound, kCFNotFound};
 365     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 366     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 367     if (calendar->_cal) {
 368         ucal_clear(calendar->_cal);
 369         UCalendarDateFields field = __CFCalendarGetICUFieldCode(unit);
 370         UErrorCode status = U_ZERO_ERROR;
 371         range.location = ucal_getLimit(calendar->_cal, field, UCAL_MINIMUM, &status);
 372         range.length = ucal_getLimit(calendar->_cal, field, UCAL_MAXIMUM, &status) - range.location + 1;
 373         if (UCAL_MONTH == field) range.location++;
 374         if (100000 < range.length) range.length = 100000;
 375     }
 376     return range;
 377 }
 378
 379 static void __CFCalendarSetToFirstInstant(CFCalendarRef calendar, CFCalendarUnit unit, CFAbsoluteTime at) {
 380     // Set UCalendar to first instant of unit prior to 'at'
 381     UErrorCode status = U_ZERO_ERROR;
 382     UDate udate = floor((at + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 383     ucal_setMillis(calendar->_cal, udate, &status);
 384     int target_era = INT_MIN;
 385     switch (unit) { // largest to smallest, we set the fields to their minimum value
 386     case kCFCalendarUnitWeek:
 387         {
 388         // reduce to first day of week, then reduce the rest of the day
 389         int32_t goal = ucal_getAttribute(calendar->_cal, UCAL_FIRST_DAY_OF_WEEK);
 390         int32_t dow = ucal_get(calendar->_cal, UCAL_DAY_OF_WEEK, &status);
 391         while (dow != goal) {
 392             ucal_add(calendar->_cal, UCAL_DAY_OF_MONTH, -1, &status);
 393             dow = ucal_get(calendar->_cal, UCAL_DAY_OF_WEEK, &status);
 394         }
 395         goto day;
 396         }
 397     case kCFCalendarUnitEra:
 398         {
 399         target_era = ucal_get(calendar->_cal, UCAL_ERA, &status);
 400         ucal_set(calendar->_cal, UCAL_YEAR, ucal_getLimit(calendar->_cal, UCAL_YEAR, UCAL_ACTUAL_MINIMUM, &status));
 401         }
 402     case kCFCalendarUnitYear:
 403         ucal_set(calendar->_cal, UCAL_MONTH, ucal_getLimit(calendar->_cal, UCAL_MONTH, UCAL_ACTUAL_MINIMUM, &status));
 404     case kCFCalendarUnitMonth:
 405         ucal_set(calendar->_cal, UCAL_DAY_OF_MONTH, ucal_getLimit(calendar->_cal, UCAL_DAY_OF_MONTH, UCAL_ACTUAL_MINIMUM, &status));
 406     case kCFCalendarUnitWeekday:
 407     case kCFCalendarUnitDay:
 408     day:;
 409         ucal_set(calendar->_cal, UCAL_HOUR_OF_DAY, ucal_getLimit(calendar->_cal, UCAL_HOUR_OF_DAY, UCAL_ACTUAL_MINIMUM, &status));
 410     case kCFCalendarUnitHour:
 411         ucal_set(calendar->_cal, UCAL_MINUTE, ucal_getLimit(calendar->_cal, UCAL_MINUTE, UCAL_ACTUAL_MINIMUM, &status));
 412     case kCFCalendarUnitMinute:
 413         ucal_set(calendar->_cal, UCAL_SECOND, ucal_getLimit(calendar->_cal, UCAL_SECOND, UCAL_ACTUAL_MINIMUM, &status));
 414     case kCFCalendarUnitSecond:
 415         ucal_set(calendar->_cal, UCAL_MILLISECOND, 0);
 416     }
 417     if (INT_MIN != target_era && ucal_get(calendar->_cal, UCAL_ERA, &status) < target_era) {
 418         // In the Japanese calendar, and possibly others, eras don't necessarily
 419         // start on the first day of a year, so the previous code may have backed
 420         // up into the previous era, and we have to correct forward.
 421         UDate bad_udate = ucal_getMillis(calendar->_cal, &status);
 422         ucal_add(calendar->_cal, UCAL_MONTH, 1, &status);
 423         while (ucal_get(calendar->_cal, UCAL_ERA, &status) < target_era) {
 424             bad_udate = ucal_getMillis(calendar->_cal, &status);
 425             ucal_add(calendar->_cal, UCAL_MONTH, 1, &status);
 426         }
 427         udate = ucal_getMillis(calendar->_cal, &status);
 428         // target date is between bad_udate and udate
 429         for (;;) {
 430             UDate test_udate = (udate + bad_udate) / 2;
 431             ucal_setMillis(calendar->_cal, test_udate, &status);
 432             if (ucal_get(calendar->_cal, UCAL_ERA, &status) < target_era) {
 433                 bad_udate = test_udate;
 434             } else {
 435                 udate = test_udate;
 436             }
 437             if (fabs(udate - bad_udate) < 1000) break;
 438         }
 439         do {
 440             bad_udate = floor((bad_udate + 1000) / 1000) * 1000;
 441             ucal_setMillis(calendar->_cal, bad_udate, &status);
 442         } while (ucal_get(calendar->_cal, UCAL_ERA, &status) < target_era);
 443     }
 444 }
 445
 446 static Boolean __validUnits(CFCalendarUnit smaller, CFCalendarUnit bigger) {
 447     switch (bigger) {
 448     case kCFCalendarUnitEra:
 449         if (kCFCalendarUnitEra == smaller) return false;
 450         if (kCFCalendarUnitWeekday == smaller) return false;
 451         if (kCFCalendarUnitMinute == smaller) return false;     // this causes CFIndex overflow in range.length
 452         if (kCFCalendarUnitSecond == smaller) return false;     // this causes CFIndex overflow in range.length
 453         return true;
 454     case kCFCalendarUnitYear:
 455         if (kCFCalendarUnitEra == smaller) return false;
 456         if (kCFCalendarUnitYear == smaller) return false;
 457         if (kCFCalendarUnitWeekday == smaller) return false;
 458         return true;
 459     case kCFCalendarUnitMonth:
 460         if (kCFCalendarUnitEra == smaller) return false;
 461         if (kCFCalendarUnitYear == smaller) return false;
 462         if (kCFCalendarUnitMonth == smaller) return false;
 463         if (kCFCalendarUnitWeekday == smaller) return false;
 464         return true;
 465     case kCFCalendarUnitDay:
 466         if (kCFCalendarUnitHour == smaller) return true;
 467         if (kCFCalendarUnitMinute == smaller) return true;
 468         if (kCFCalendarUnitSecond == smaller) return true;
 469         return false;
 470     case kCFCalendarUnitHour:
 471         if (kCFCalendarUnitMinute == smaller) return true;
 472         if (kCFCalendarUnitSecond == smaller) return true;
 473         return false;
 474     case kCFCalendarUnitMinute:
 475         if (kCFCalendarUnitSecond == smaller) return true;
 476         return false;
 477     case kCFCalendarUnitWeek:
 478         if (kCFCalendarUnitWeekday == smaller) return true;
 479         if (kCFCalendarUnitDay == smaller) return true;
 480         if (kCFCalendarUnitHour == smaller) return true;
 481         if (kCFCalendarUnitMinute == smaller) return true;
 482         if (kCFCalendarUnitSecond == smaller) return true;
 483         return false;
 484     case kCFCalendarUnitSecond:
 485     case kCFCalendarUnitWeekday:
 486     case kCFCalendarUnitWeekdayOrdinal:
 487         return false;
 488     }
 489     return false;
 490 };
 491
 492 static CFRange __CFCalendarGetRangeOfUnit1(CFCalendarRef calendar, CFCalendarUnit smallerUnit, CFCalendarUnit biggerUnit, CFAbsoluteTime at) {
 493     CFRange range = {kCFNotFound, kCFNotFound};
 494     if (!__validUnits(smallerUnit, biggerUnit)) return range;
 495     CF_OBJC_FUNCDISPATCH3(CFCalendarGetTypeID(), CFRange, calendar, "_rangeOfUnit:inUnit:forAT:", smallerUnit, biggerUnit, at);
 496     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 497     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 498     if (calendar->_cal) {
 499         int32_t dow = -1;
 500         ucal_clear(calendar->_cal);
 501         UCalendarDateFields smallField = __CFCalendarGetICUFieldCode(smallerUnit);
 502         UCalendarDateFields bigField = __CFCalendarGetICUFieldCode(biggerUnit);
 503         if (kCFCalendarUnitWeekdayOrdinal == smallerUnit) {
 504             UErrorCode status = U_ZERO_ERROR;
 505             UDate udate = floor((at + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 506             ucal_setMillis(calendar->_cal, udate, &status);
 507             dow = ucal_get(calendar->_cal, UCAL_DAY_OF_WEEK, &status);
 508         }
 509         // Set calendar to first instant of big unit
 510         __CFCalendarSetToFirstInstant(calendar, biggerUnit, at);
 511         UErrorCode status = U_ZERO_ERROR;
 512         UDate start = ucal_getMillis(calendar->_cal, &status);
 513         if (kCFCalendarUnitWeek == biggerUnit) {
 514             range.location = ucal_get(calendar->_cal, smallField, &status);
 515             if (kCFCalendarUnitMonth == smallerUnit) range.location++;
 516         } else {
 517             range.location = (kCFCalendarUnitHour == smallerUnit || kCFCalendarUnitMinute == smallerUnit || kCFCalendarUnitSecond == smallerUnit) ? 0 : 1;
 518         }
 519         // Set calendar to first instant of next value of big unit
 520         if (UCAL_ERA == bigField) {
 521             // ICU refuses to do the addition, probably because we are
 522             // at the limit of UCAL_ERA.  Use alternate strategy.
 523             CFIndex limit = ucal_getLimit(calendar->_cal, UCAL_YEAR, UCAL_MAXIMUM, &status);
 524             if (100000 < limit) limit = 100000;
 525             ucal_add(calendar->_cal, UCAL_YEAR, limit, &status);
 526         } else {
 527             ucal_add(calendar->_cal, bigField, 1, &status);
 528         }
 529         if (kCFCalendarUnitWeek == smallerUnit && kCFCalendarUnitYear == biggerUnit) {
 530             ucal_add(calendar->_cal, UCAL_SECOND, -1, &status);
 531             range.length = ucal_get(calendar->_cal, UCAL_WEEK_OF_YEAR, &status);
 532             while (1 == range.length) {
 533                 ucal_add(calendar->_cal, UCAL_DAY_OF_MONTH, -1, &status);
 534                 range.length = ucal_get(calendar->_cal, UCAL_WEEK_OF_YEAR, &status);
 535             }
 536             range.location = 1;
 537             return range;
 538         } else if (kCFCalendarUnitWeek == smallerUnit && kCFCalendarUnitMonth == biggerUnit) {
 539             ucal_add(calendar->_cal, UCAL_SECOND, -1, &status);
 540             range.length = ucal_get(calendar->_cal, UCAL_WEEK_OF_YEAR, &status);
 541             range.location = 1;
 542             return range;
 543         }
 544         UDate goal = ucal_getMillis(calendar->_cal, &status);
 545         // Set calendar back to first instant of big unit
 546         ucal_setMillis(calendar->_cal, start, &status);
 547         if (kCFCalendarUnitWeekdayOrdinal == smallerUnit) {
 548             // roll day forward to first 'dow'
 549             while (ucal_get(calendar->_cal, (kCFCalendarUnitMonth == biggerUnit) ? UCAL_WEEK_OF_MONTH : UCAL_WEEK_OF_YEAR, &status) != 1) {
 550                 ucal_add(calendar->_cal, UCAL_DAY_OF_MONTH, 1, &status);
 551             }
 552             while (ucal_get(calendar->_cal, UCAL_DAY_OF_WEEK, &status) != dow) {
 553                 ucal_add(calendar->_cal, UCAL_DAY_OF_MONTH, 1, &status);
 554             }
 555             start = ucal_getMillis(calendar->_cal, &status);
 556             goal -= 1000;
 557             range.location = 1;  // constant here works around ICU -- see 3948293
 558         }
 559         UDate curr = start;
 560         range.length =  (kCFCalendarUnitWeekdayOrdinal == smallerUnit) ? 1 : 0;
 561         const int multiple_table[] = {0, 0, 16, 19, 24, 26, 24, 28, 14, 14, 14};
 562         int multiple = (1 << multiple_table[flsl(smallerUnit) - 1]);
 563         Boolean divide = false, alwaysDivide = false;
 564         while (curr < goal) {
 565             ucal_add(calendar->_cal, smallField, multiple, &status);
 566             UDate newcurr = ucal_getMillis(calendar->_cal, &status);
 567             if (curr < newcurr && newcurr <= goal) {
 568                 range.length += multiple;
 569                 curr = newcurr;
 570             } else {
 571                 // Either newcurr is going backwards, or not making
 572                 // progress, or has overshot the goal; reset date
 573                 // and try smaller multiples.
 574                 ucal_setMillis(calendar->_cal, curr, &status);
 575                 divide = true;
 576                 // once we start overshooting the goal, the add at
 577                 // smaller multiples will succeed at most once for
 578                 // each multiple, so we reduce it every time through
 579                 // the loop.
 580                 if (goal < newcurr) alwaysDivide = true;
 581             }
 582             if (divide) {
 583                 multiple = multiple / 2;
 584                 if (0 == multiple) break;
 585                 divide = alwaysDivide;
 586             }
 587         }
 588     }
 589     return range;
 590 }
 591
 592 static CFRange __CFCalendarGetRangeOfUnit2(CFCalendarRef calendar, CFCalendarUnit smallerUnit, CFCalendarUnit biggerUnit, CFAbsoluteTime at) __attribute__((noinline));
 593 static CFRange __CFCalendarGetRangeOfUnit2(CFCalendarRef calendar, CFCalendarUnit smallerUnit, CFCalendarUnit biggerUnit, CFAbsoluteTime at) {
 594     CF_OBJC_FUNCDISPATCH3(CFCalendarGetTypeID(), CFRange, calendar, "_rangeOfUnit:inUnit:forAT:", smallerUnit, biggerUnit, at);
 595     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 596     CFRange range = {kCFNotFound, kCFNotFound};
 597     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 598     if (calendar->_cal) {
 599         switch (smallerUnit) {
 600         case kCFCalendarUnitSecond:
 601             switch (biggerUnit) {
 602             case kCFCalendarUnitMinute:
 603             case kCFCalendarUnitHour:
 604             case kCFCalendarUnitDay:
 605             case kCFCalendarUnitWeekday:
 606             case kCFCalendarUnitWeek:
 607             case kCFCalendarUnitMonth:
 608             case kCFCalendarUnitYear:
 609             case kCFCalendarUnitEra:
 610                 // goto calculate;
 611                 range.location = 0;
 612                 range.length = 60;
 613                 break;
 614             }
 615             break;
 616         case kCFCalendarUnitMinute:
 617             switch (biggerUnit) {
 618             case kCFCalendarUnitHour:
 619             case kCFCalendarUnitDay:
 620             case kCFCalendarUnitWeekday:
 621             case kCFCalendarUnitWeek:
 622             case kCFCalendarUnitMonth:
 623             case kCFCalendarUnitYear:
 624             case kCFCalendarUnitEra:
 625                 // goto calculate;
 626                 range.location = 0;
 627                 range.length = 60;
 628                 break;
 629             }
 630             break;
 631         case kCFCalendarUnitHour:
 632             switch (biggerUnit) {
 633             case kCFCalendarUnitDay:
 634             case kCFCalendarUnitWeekday:
 635             case kCFCalendarUnitWeek:
 636             case kCFCalendarUnitMonth:
 637             case kCFCalendarUnitYear:
 638             case kCFCalendarUnitEra:
 639                 // goto calculate;
 640                 range.location = 0;
 641                 range.length = 24;
 642                 break;
 643             }
 644             break;
 645         case kCFCalendarUnitDay:
 646             switch (biggerUnit) {
 647             case kCFCalendarUnitWeek:
 648             case kCFCalendarUnitMonth:
 649             case kCFCalendarUnitYear:
 650             case kCFCalendarUnitEra:
 651                 goto calculate;
 652                 break;
 653             }
 654             break;
 655         case kCFCalendarUnitWeekday:
 656             switch (biggerUnit) {
 657             case kCFCalendarUnitWeek:
 658             case kCFCalendarUnitMonth:
 659             case kCFCalendarUnitYear:
 660             case kCFCalendarUnitEra:
 661                 goto calculate;
 662                 break;
 663             }
 664             break;
 665         case kCFCalendarUnitWeekdayOrdinal:
 666             switch (biggerUnit) {
 667             case kCFCalendarUnitMonth:
 668             case kCFCalendarUnitYear:
 669             case kCFCalendarUnitEra:
 670                 goto calculate;
 671                 break;
 672             }
 673             break;
 674         case kCFCalendarUnitWeek:
 675             switch (biggerUnit) {
 676             case kCFCalendarUnitMonth:
 677             case kCFCalendarUnitYear:
 678             case kCFCalendarUnitEra:
 679                 goto calculate;
 680                 break;
 681             }
 682             break;
 683         case kCFCalendarUnitMonth:
 684             switch (biggerUnit) {
 685             case kCFCalendarUnitYear:
 686             case kCFCalendarUnitEra:
 687                 goto calculate;
 688                 break;
 689             }
 690             break;
 691         case kCFCalendarUnitYear:
 692             switch (biggerUnit) {
 693             case kCFCalendarUnitEra:
 694                 goto calculate;
 695                 break;
 696             }
 697             break;
 698         case kCFCalendarUnitEra:
 699             break;
 700         }
 701     }
 702     return range;
 703
 704     calculate:;
 705     ucal_clear(calendar->_cal);
 706     UCalendarDateFields smallField = __CFCalendarGetICUFieldCode(smallerUnit);
 707     UCalendarDateFields bigField = __CFCalendarGetICUFieldCode(biggerUnit);
 708     UCalendarDateFields yearField = __CFCalendarGetICUFieldCode(kCFCalendarUnitYear);
 709     UCalendarDateFields fieldToAdd = smallField;
 710     if (kCFCalendarUnitWeekday == smallerUnit) {
 711         fieldToAdd = __CFCalendarGetICUFieldCode(kCFCalendarUnitDay);
 712     }
 713     int32_t dow = -1;
 714     if (kCFCalendarUnitWeekdayOrdinal == smallerUnit) {
 715         UErrorCode status = U_ZERO_ERROR;
 716         UDate udate = floor((at + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 717         ucal_setMillis(calendar->_cal, udate, &status);
 718         dow = ucal_get(calendar->_cal, UCAL_DAY_OF_WEEK, &status);
 719         fieldToAdd = __CFCalendarGetICUFieldCode(kCFCalendarUnitWeek);
 720     }
 721     // Set calendar to first instant of big unit
 722     __CFCalendarSetToFirstInstant(calendar, biggerUnit, at);
 723     if (kCFCalendarUnitWeekdayOrdinal == smallerUnit) {
 724         UErrorCode status = U_ZERO_ERROR;
 725         // roll day forward to first 'dow'
 726         while (ucal_get(calendar->_cal, (kCFCalendarUnitMonth == biggerUnit) ? UCAL_WEEK_OF_MONTH : UCAL_WEEK_OF_YEAR, &status) != 1) {
 727             ucal_add(calendar->_cal, UCAL_DAY_OF_MONTH, 1, &status);
 728         }
 729         while (ucal_get(calendar->_cal, UCAL_DAY_OF_WEEK, &status) != dow) {
 730             ucal_add(calendar->_cal, UCAL_DAY_OF_MONTH, 1, &status);
 731         }
 732     }
 733     int32_t minSmallValue = INT32_MAX;
 734     int32_t maxSmallValue = INT32_MIN;
 735     UErrorCode status = U_ZERO_ERROR;
 736     int32_t bigValue = ucal_get(calendar->_cal, bigField, &status);
 737     for (;;) {
 738         int32_t smallValue = ucal_get(calendar->_cal, smallField, &status);
 739         if (smallValue < minSmallValue) minSmallValue = smallValue;
 740         if (smallValue > maxSmallValue) maxSmallValue = smallValue;
 741         ucal_add(calendar->_cal, fieldToAdd, 1, &status);
 742         if (bigValue != ucal_get(calendar->_cal, bigField, &status)) break;
 743         if (biggerUnit == kCFCalendarUnitEra && ucal_get(calendar->_cal, yearField, &status) > 10000) break;
 744         // we assume an answer for 10000 years can be extrapolated to 100000 years, to save time
 745     }
 746     status = U_ZERO_ERROR;
 747     range.location = minSmallValue;
 748     if (smallerUnit == kCFCalendarUnitMonth) range.location = 1;
 749     range.length = maxSmallValue - minSmallValue + 1;
 750     if (biggerUnit == kCFCalendarUnitEra && ucal_get(calendar->_cal, yearField, &status) > 10000) range.length = 100000;
 751
 752     return range;
 753 }
 754
 755 CFRange CFCalendarGetRangeOfUnit(CFCalendarRef calendar, CFCalendarUnit smallerUnit, CFCalendarUnit biggerUnit, CFAbsoluteTime at) {
 756     if (_CFExecutableLinkedOnOrAfter(CFSystemVersionLeopard)) {
 757         return __CFCalendarGetRangeOfUnit2(calendar, smallerUnit, biggerUnit, at);
 758     } else {
 759         return __CFCalendarGetRangeOfUnit1(calendar, smallerUnit, biggerUnit, at);
 760     }
 761 }
 762
 763 CFIndex CFCalendarGetOrdinalityOfUnit(CFCalendarRef calendar, CFCalendarUnit smallerUnit, CFCalendarUnit biggerUnit, CFAbsoluteTime at) {
 764     CFIndex result = kCFNotFound;
 765     if (!__validUnits(smallerUnit, biggerUnit)) return result;
 766     CF_OBJC_FUNCDISPATCH3(CFCalendarGetTypeID(), CFIndex, calendar, "_ordinalityOfUnit:inUnit:forAT:", smallerUnit, biggerUnit, at);
 767     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 768     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 769     if (calendar->_cal) {
 770         UErrorCode status = U_ZERO_ERROR;
 771         ucal_clear(calendar->_cal);
 772         if (kCFCalendarUnitWeek == smallerUnit && kCFCalendarUnitYear == biggerUnit) {
 773             UDate udate = floor((at + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 774             ucal_setMillis(calendar->_cal, udate, &status);
 775             int32_t val = ucal_get(calendar->_cal, UCAL_WEEK_OF_YEAR, &status);
 776             return val;
 777         } else if (kCFCalendarUnitWeek == smallerUnit && kCFCalendarUnitMonth == biggerUnit) {
 778             UDate udate = floor((at + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 779             ucal_setMillis(calendar->_cal, udate, &status);
 780             int32_t val = ucal_get(calendar->_cal, UCAL_WEEK_OF_MONTH, &status);
 781             return val;
 782         }
 783         UCalendarDateFields smallField = __CFCalendarGetICUFieldCode(smallerUnit);
 784         // Set calendar to first instant of big unit
 785         __CFCalendarSetToFirstInstant(calendar, biggerUnit, at);
 786         UDate curr = ucal_getMillis(calendar->_cal, &status);
 787         UDate goal = floor((at + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 788         result = 1;
 789         const int multiple_table[] = {0, 0, 16, 19, 24, 26, 24, 28, 14, 14, 14};
 790         int multiple = (1 << multiple_table[flsl(smallerUnit) - 1]);
 791         Boolean divide = false, alwaysDivide = false;
 792         while (curr < goal) {
 793             ucal_add(calendar->_cal, smallField, multiple, &status);
 794             UDate newcurr = ucal_getMillis(calendar->_cal, &status);
 795             if (curr < newcurr && newcurr <= goal) {
 796                 result += multiple;
 797                 curr = newcurr;
 798             } else {
 799                 // Either newcurr is going backwards, or not making
 800                 // progress, or has overshot the goal; reset date
 801                 // and try smaller multiples.
 802                 ucal_setMillis(calendar->_cal, curr, &status);
 803                 divide = true;
 804                 // once we start overshooting the goal, the add at
 805                 // smaller multiples will succeed at most once for
 806                 // each multiple, so we reduce it every time through
 807                 // the loop.
 808                 if (goal < newcurr) alwaysDivide = true;
 809             }
 810             if (divide) {
 811                 multiple = multiple / 2;
 812                 if (0 == multiple) break;
 813                 divide = alwaysDivide;
 814             }
 815         }
 816     }
 817     return result;
 818 }
 819
 820 Boolean _CFCalendarComposeAbsoluteTimeV(CFCalendarRef calendar, /* out */ CFAbsoluteTime *atp, const char *componentDesc, int *vector, int count) {
 821     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 822     if (calendar->_cal) {
 823         UErrorCode status = U_ZERO_ERROR;
 824         ucal_clear(calendar->_cal);
 825         ucal_set(calendar->_cal, UCAL_YEAR, 1);
 826         ucal_set(calendar->_cal, UCAL_MONTH, 0);
 827         ucal_set(calendar->_cal, UCAL_DAY_OF_MONTH, 1);
 828         ucal_set(calendar->_cal, UCAL_HOUR_OF_DAY, 0);
 829         ucal_set(calendar->_cal, UCAL_MINUTE, 0);
 830         ucal_set(calendar->_cal, UCAL_SECOND, 0);
 831         const char *desc = componentDesc;
 832         Boolean doWOY = false;
 833         char ch = *desc;
 834         while (ch) {
 835             UCalendarDateFields field = __CFCalendarGetICUFieldCodeFromChar(ch);
 836             if (UCAL_WEEK_OF_YEAR == field) {
 837                 doWOY = true;
 838             }
 839             desc++;
 840             ch = *desc;
 841         }
 842         desc = componentDesc;
 843         ch = *desc;
 844         while (ch) {
 845             UCalendarDateFields field = __CFCalendarGetICUFieldCodeFromChar(ch);
 846             int value = *vector;
 847             if (UCAL_YEAR == field && doWOY) field = UCAL_YEAR_WOY;
 848             if (UCAL_MONTH == field) value--;
 849             ucal_set(calendar->_cal, field, value);
 850             vector++;
 851             desc++;
 852             ch = *desc;
 853         }
 854         UDate udate = ucal_getMillis(calendar->_cal, &status);
 855         CFAbsoluteTime at = (udate / 1000.0) - kCFAbsoluteTimeIntervalSince1970;
 856         if (atp) *atp = at;
 857         return U_SUCCESS(status) ? true : false;
 858     }
 859     return false;
 860 }
 861
 862 Boolean _CFCalendarDecomposeAbsoluteTimeV(CFCalendarRef calendar, CFAbsoluteTime at, const char *componentDesc, int **vector, int count) {
 863     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 864     if (calendar->_cal) {
 865         UErrorCode status = U_ZERO_ERROR;
 866         ucal_clear(calendar->_cal);
 867         UDate udate = floor((at + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 868         ucal_setMillis(calendar->_cal, udate, &status);
 869         char ch = *componentDesc;
 870         while (ch) {
 871             UCalendarDateFields field = __CFCalendarGetICUFieldCodeFromChar(ch);
 872             int value = ucal_get(calendar->_cal, field, &status);
 873             if (UCAL_MONTH == field) value++;
 874             *(*vector) = value;
 875             vector++;
 876             componentDesc++;
 877             ch = *componentDesc;
 878         }
 879         return U_SUCCESS(status) ? true : false;
 880     }
 881     return false;
 882 }
 883
 884 Boolean _CFCalendarAddComponentsV(CFCalendarRef calendar, /* inout */ CFAbsoluteTime *atp, CFOptionFlags options, const char *componentDesc, int *vector, int count) {
 885     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 886     if (calendar->_cal) {
 887         UErrorCode status = U_ZERO_ERROR;
 888         ucal_clear(calendar->_cal);
 889         UDate udate = floor((*atp + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 890         ucal_setMillis(calendar->_cal, udate, &status);
 891         char ch = *componentDesc;
 892         while (ch) {
 893             UCalendarDateFields field = __CFCalendarGetICUFieldCodeFromChar(ch);
 894             int amount = *vector;
 895             if (options & kCFCalendarComponentsWrap) {
 896                 ucal_roll(calendar->_cal, field, amount, &status);
 897             } else {
 898                 ucal_add(calendar->_cal, field, amount, &status);
 899             }
 900             vector++;
 901             componentDesc++;
 902             ch = *componentDesc;
 903         }
 904         udate = ucal_getMillis(calendar->_cal, &status);
 905         *atp = (udate / 1000.0) - kCFAbsoluteTimeIntervalSince1970;
 906         return U_SUCCESS(status) ? true : false;
 907     }
 908     return false;
 909 }
 910
 911 Boolean _CFCalendarGetComponentDifferenceV(CFCalendarRef calendar, CFAbsoluteTime startingAT, CFAbsoluteTime resultAT, CFOptionFlags options, const char *componentDesc, int **vector, int count) {
 912     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 913     if (calendar->_cal) {
 914         UErrorCode status = U_ZERO_ERROR;
 915         ucal_clear(calendar->_cal);
 916         UDate curr = floor((startingAT + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 917         UDate goal = floor((resultAT + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 918         ucal_setMillis(calendar->_cal, curr, &status);
 919         int direction = (startingAT <= resultAT) ? 1 : -1;
 920         char ch = *componentDesc;
 921         while (ch) {
 922             UCalendarDateFields field = __CFCalendarGetICUFieldCodeFromChar(ch);
 923             const int multiple_table[] = {0, 0, 16, 19, 24, 26, 24, 28, 14, 14, 14};
 924             int multiple = direction * (1 << multiple_table[flsl(__CFCalendarGetCalendarUnitFromChar(ch)) - 1]);
 925             Boolean divide = false, alwaysDivide = false;
 926             int result = 0;
 927             while ((direction > 0 && curr < goal) || (direction < 0 && goal < curr)) {
 928                 ucal_add(calendar->_cal, field, multiple, &status);
 929                 UDate newcurr = ucal_getMillis(calendar->_cal, &status);
 930                 if ((direction > 0 && curr < newcurr && newcurr <= goal) || (direction < 0 && newcurr < curr && goal <= newcurr)) {
 931                     result += multiple;
 932                     curr = newcurr;
 933                 } else {
 934                     // Either newcurr is going backwards, or not making
 935                     // progress, or has overshot the goal; reset date
 936                     // and try smaller multiples.
 937                     ucal_setMillis(calendar->_cal, curr, &status);
 938                     divide = true;
 939                     // once we start overshooting the goal, the add at
 940                     // smaller multiples will succeed at most once for
 941                     // each multiple, so we reduce it every time through
 942                     // the loop.
 943                     if ((direction > 0 && goal < newcurr) || (direction < 0 && newcurr < goal)) alwaysDivide = true;
 944                 }
 945                 if (divide) {
 946                     multiple = multiple / 2;
 947                     if (0 == multiple) break;
 948                     divide = alwaysDivide;
 949                 }
 950             }
 951             *(*vector) = result;
 952             vector++;
 953             componentDesc++;
 954             ch = *componentDesc;
 955         }
 956         return U_SUCCESS(status) ? true : false;
 957     }
 958     return false;
 959 }
 960
 961 Boolean CFCalendarComposeAbsoluteTime(CFCalendarRef calendar, /* out */ CFAbsoluteTime *atp, const char *componentDesc, ...) {
 962     va_list args;
 963     va_start(args, componentDesc);
 964     CF_OBJC_FUNCDISPATCH3(CFCalendarGetTypeID(), Boolean, calendar, "_composeAbsoluteTime:::", atp, componentDesc, args);
 965     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 966     int idx, cnt = strlen((char *)componentDesc);
 967     STACK_BUFFER_DECL(int, vector, cnt);
 968     for (idx = 0; idx < cnt; idx++) {
 969         int arg = va_arg(args, int);
 970         vector[idx] = arg;
 971     }
 972     va_end(args);
 973     return _CFCalendarComposeAbsoluteTimeV(calendar, atp, componentDesc, vector, cnt);
 974 }
 975
 976 Boolean CFCalendarDecomposeAbsoluteTime(CFCalendarRef calendar, CFAbsoluteTime at, const char *componentDesc, ...) {
 977     va_list args;
 978     va_start(args, componentDesc);
 979     CF_OBJC_FUNCDISPATCH3(CFCalendarGetTypeID(), Boolean, calendar, "_decomposeAbsoluteTime:::", at, componentDesc, args);
 980     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 981     int idx, cnt = strlen((char *)componentDesc);
 982     STACK_BUFFER_DECL(int *, vector, cnt);
 983     for (idx = 0; idx < cnt; idx++) {
 984         int *arg = va_arg(args, int *);
 985         vector[idx] = arg;
 986     }
 987     va_end(args);
 988     return _CFCalendarDecomposeAbsoluteTimeV(calendar, at, componentDesc, vector, cnt);
 989 }
 990
 991 Boolean CFCalendarAddComponents(CFCalendarRef calendar, /* inout */ CFAbsoluteTime *atp, CFOptionFlags options, const char *componentDesc, ...) {
 992     va_list args;
 993     va_start(args, componentDesc);
 994     CF_OBJC_FUNCDISPATCH4(CFCalendarGetTypeID(), Boolean, calendar, "_addComponents::::", atp, options, componentDesc, args);
 995     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 996     int idx, cnt = strlen((char *)componentDesc);
 997     STACK_BUFFER_DECL(int, vector, cnt);
 998     for (idx = 0; idx < cnt; idx++) {
 999         int arg = va_arg(args, int);
1000         vector[idx] = arg;
1001     }
1002     va_end(args);
1003     return _CFCalendarAddComponentsV(calendar, atp, options, componentDesc, vector, cnt);
1004 }
1005
1006 Boolean CFCalendarGetComponentDifference(CFCalendarRef calendar, CFAbsoluteTime startingAT, CFAbsoluteTime resultAT, CFOptionFlags options, const char *componentDesc, ...) {
1007     va_list args;
1008     va_start(args, componentDesc);
1009     CF_OBJC_FUNCDISPATCH5(CFCalendarGetTypeID(), Boolean, calendar, "_diffComponents:::::", startingAT, resultAT, options, componentDesc, args);
1010     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
1011     int idx, cnt = strlen((char *)componentDesc);
1012     STACK_BUFFER_DECL(int *, vector, cnt);
1013     for (idx = 0; idx < cnt; idx++) {
1014         int *arg = va_arg(args, int *);
1015         vector[idx] = arg;
1016     }
1017     va_end(args);
1018     Boolean ret = _CFCalendarGetComponentDifferenceV(calendar, startingAT, resultAT, options, componentDesc, vector, cnt);
1019     return ret;
1020 }
1021
1022 Boolean CFCalendarGetTimeRangeOfUnit(CFCalendarRef calendar, CFCalendarUnit unit, CFAbsoluteTime at, CFAbsoluteTime *startp, CFTimeInterval *tip) {
1023     CF_OBJC_FUNCDISPATCH4(CFCalendarGetTypeID(), Boolean, calendar, "_rangeOfUnit:startTime:interval:forAT:", unit, startp, tip, at);
1024     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
1025     if (kCFCalendarUnitWeekdayOrdinal == unit) return false;
1026     if (kCFCalendarUnitWeekday == unit) unit = kCFCalendarUnitDay;
1027     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
1028     if (calendar->_cal) {
1029         ucal_clear(calendar->_cal);
1030         __CFCalendarSetToFirstInstant(calendar, unit, at);
1031         UErrorCode status = U_ZERO_ERROR;
1032         UDate start = ucal_getMillis(calendar->_cal, &status);
1033         UCalendarDateFields field = __CFCalendarGetICUFieldCode(unit);
1034         ucal_add(calendar->_cal, field, 1, &status);
1035         UDate end = ucal_getMillis(calendar->_cal, &status);
1036         if (end == start && kCFCalendarUnitEra == unit) {
1037             // ICU refuses to do the addition, probably because we are
1038             // at the limit of UCAL_ERA.  Use alternate strategy.
1039             CFIndex limit = ucal_getLimit(calendar->_cal, UCAL_YEAR, UCAL_MAXIMUM, &status);
1040             if (100000 < limit) limit = 100000;
1041             ucal_add(calendar->_cal, UCAL_YEAR, limit, &status);
1042             end = ucal_getMillis(calendar->_cal, &status);
1043         }
1044         if (U_SUCCESS(status)) {
1045             if (startp) *startp = (double)start / 1000.0 - kCFAbsoluteTimeIntervalSince1970;
1046             if (tip) *tip = (double)(end - start) / 1000.0;
1047             return true;
1048         }
1049     }
1050
1051     return false;
1052 }
1053
1054 #undef BUFFER_SIZE
1055