CFCalendar.c

   1 /*
   2  * Copyright (c) 2015 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 (c) 2004-2014, Apple Inc. All rights reserved.
  26         Responsibility: Christopher Kane
  27 */
  28
  29
  30 #include <CoreFoundation/CFCalendar.h>
  31 #include <CoreFoundation/CFRuntime.h>
  32 #include "CFInternal.h"
  33 #include "CFPriv.h"
  34 #include <unicode/ucal.h>
  35
  36 #define BUFFER_SIZE 512
  37
  38 struct __CFCalendar {
  39     CFRuntimeBase _base;
  40     CFStringRef _identifier;    // canonical identifier, never NULL
  41     CFLocaleRef _locale;
  42     CFStringRef _localeID;
  43     CFTimeZoneRef _tz;
  44     UCalendar *_cal;
  45 };
  46
  47 static Boolean __CFCalendarEqual(CFTypeRef cf1, CFTypeRef cf2) {
  48     CFCalendarRef calendar1 = (CFCalendarRef)cf1;
  49     CFCalendarRef calendar2 = (CFCalendarRef)cf2;
  50     return CFEqual(calendar1->_identifier, calendar2->_identifier);
  51 }
  52
  53 static CFHashCode __CFCalendarHash(CFTypeRef cf) {
  54     CFCalendarRef calendar = (CFCalendarRef)cf;
  55     return CFHash(calendar->_identifier);
  56 }
  57
  58 static CFStringRef __CFCalendarCopyDescription(CFTypeRef cf) {
  59     CFCalendarRef calendar = (CFCalendarRef)cf;
  60     return CFStringCreateWithFormat(CFGetAllocator(calendar), NULL, CFSTR("<CFCalendar %p [%p]>{identifier = '%@'}"), cf, CFGetAllocator(calendar), calendar->_identifier);
  61 }
  62
  63 static void __CFCalendarDeallocate(CFTypeRef cf) {
  64     CFCalendarRef calendar = (CFCalendarRef)cf;
  65     CFRelease(calendar->_identifier);
  66     if (calendar->_locale) CFRelease(calendar->_locale);
  67     if (calendar->_localeID) CFRelease(calendar->_localeID);
  68     CFRelease(calendar->_tz);
  69     if (calendar->_cal) ucal_close(calendar->_cal);
  70 }
  71
  72 static CFTypeID __kCFCalendarTypeID = _kCFRuntimeNotATypeID;
  73
  74 static const CFRuntimeClass __CFCalendarClass = {
  75     0,
  76     "CFCalendar",
  77     NULL,       // init
  78     NULL,       // copy
  79     __CFCalendarDeallocate,
  80     __CFCalendarEqual,
  81     __CFCalendarHash,
  82     NULL,       //
  83     __CFCalendarCopyDescription
  84 };
  85
  86 CFTypeID CFCalendarGetTypeID(void) {
  87     static dispatch_once_t initOnce;
  88     dispatch_once(&initOnce, ^{ __kCFCalendarTypeID = _CFRuntimeRegisterClass(&__CFCalendarClass); });
  89     return __kCFCalendarTypeID;
  90 }
  91
  92 CF_PRIVATE UCalendar *__CFCalendarCreateUCalendar(CFStringRef calendarID, CFStringRef localeID, CFTimeZoneRef tz) {
  93     if (calendarID) {
  94         CFDictionaryRef components = CFLocaleCreateComponentsFromLocaleIdentifier(kCFAllocatorSystemDefault, localeID);
  95         CFMutableDictionaryRef mcomponents = CFDictionaryCreateMutableCopy(kCFAllocatorSystemDefault, 0, components);
  96         CFDictionarySetValue(mcomponents, kCFLocaleCalendarIdentifier, calendarID);
  97         localeID = CFLocaleCreateLocaleIdentifierFromComponents(kCFAllocatorSystemDefault, mcomponents);
  98         CFRelease(mcomponents);
  99         CFRelease(components);
 100     }
 101
 102     char buffer[BUFFER_SIZE];
 103     const char *cstr = CFStringGetCStringPtr(localeID, kCFStringEncodingASCII);
 104     if (NULL == cstr) {
 105         if (CFStringGetCString(localeID, buffer, BUFFER_SIZE, kCFStringEncodingASCII)) cstr = buffer;
 106     }
 107     if (NULL == cstr) {
 108         if (calendarID) CFRelease(localeID);
 109         return NULL;
 110     }
 111
 112     UChar ubuffer[BUFFER_SIZE];
 113     CFStringRef tznam = CFTimeZoneGetName(tz);
 114     CFIndex cnt = CFStringGetLength(tznam);
 115     if (BUFFER_SIZE < cnt) cnt = BUFFER_SIZE;
 116     CFStringGetCharacters(tznam, CFRangeMake(0, cnt), (UniChar *)ubuffer);
 117
 118     UErrorCode status = U_ZERO_ERROR;
 119     UCalendar *cal = ucal_open(ubuffer, cnt, cstr, UCAL_DEFAULT, &status);
 120     if (calendarID) CFRelease(localeID);
 121     return cal;
 122 }
 123
 124 static void __CFCalendarSetupCal(CFCalendarRef calendar) {
 125     calendar->_cal = __CFCalendarCreateUCalendar(calendar->_identifier, calendar->_localeID, calendar->_tz);
 126 }
 127
 128 static void __CFCalendarZapCal(CFCalendarRef calendar) {
 129     ucal_close(calendar->_cal);
 130     calendar->_cal = NULL;
 131 }
 132
 133 CFCalendarRef CFCalendarCopyCurrent(void) {
 134     CFLocaleRef locale = CFLocaleCopyCurrent();
 135     CFCalendarRef calID = (CFCalendarRef)CFLocaleGetValue(locale, kCFLocaleCalendarIdentifier);
 136     if (calID) {
 137         CFCalendarRef calendar = CFCalendarCreateWithIdentifier(kCFAllocatorSystemDefault, (CFStringRef)calID);
 138         CFCalendarSetLocale(calendar, locale);
 139         CFRelease(locale);
 140         return calendar;
 141     }
 142     return NULL;
 143 }
 144
 145 CFCalendarRef CFCalendarCreateWithIdentifier(CFAllocatorRef allocator, CFStringRef identifier) {
 146     if (allocator == NULL) allocator = __CFGetDefaultAllocator();
 147     __CFGenericValidateType(allocator, CFAllocatorGetTypeID());
 148     __CFGenericValidateType(identifier, CFStringGetTypeID());
 149     // return NULL until Chinese calendar is available
 150     if (identifier != kCFGregorianCalendar && identifier != kCFBuddhistCalendar && identifier != kCFJapaneseCalendar && identifier != kCFIslamicCalendar && identifier != kCFIslamicCivilCalendar && identifier != kCFHebrewCalendar) {
 151 //    if (identifier != kCFGregorianCalendar && identifier != kCFBuddhistCalendar && identifier != kCFJapaneseCalendar && identifier != kCFIslamicCalendar && identifier != kCFIslamicCivilCalendar && identifier != kCFHebrewCalendar && identifier != kCFChineseCalendar) {
 152         if (CFEqual(kCFGregorianCalendar, identifier)) identifier = kCFGregorianCalendar;
 153         else if (CFEqual(kCFBuddhistCalendar, identifier)) identifier = kCFBuddhistCalendar;
 154         else if (CFEqual(kCFJapaneseCalendar, identifier)) identifier = kCFJapaneseCalendar;
 155         else if (CFEqual(kCFIslamicCalendar, identifier)) identifier = kCFIslamicCalendar;
 156         else if (CFEqual(kCFIslamicCivilCalendar, identifier)) identifier = kCFIslamicCivilCalendar;
 157         else if (CFEqual(kCFHebrewCalendar, identifier)) identifier = kCFHebrewCalendar;
 158 //      else if (CFEqual(kCFChineseCalendar, identifier)) identifier = kCFChineseCalendar;
 159         else return NULL;
 160     }
 161     struct __CFCalendar *calendar = NULL;
 162     uint32_t size = sizeof(struct __CFCalendar) - sizeof(CFRuntimeBase);
 163     calendar = (struct __CFCalendar *)_CFRuntimeCreateInstance(allocator, CFCalendarGetTypeID(), size, NULL);
 164     if (NULL == calendar) {
 165         return NULL;
 166     }
 167     calendar->_identifier = (CFStringRef)CFRetain(identifier);
 168     calendar->_locale = NULL;
 169     calendar->_localeID = CFLocaleGetIdentifier(CFLocaleGetSystem());
 170     calendar->_tz = CFTimeZoneCopyDefault();
 171     calendar->_cal = NULL;
 172     return (CFCalendarRef)calendar;
 173 }
 174
 175 CFStringRef CFCalendarGetIdentifier(CFCalendarRef calendar) {
 176     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), CFStringRef, calendar, calendarIdentifier);
 177     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 178     return calendar->_identifier;
 179 }
 180
 181 CFLocaleRef CFCalendarCopyLocale(CFCalendarRef calendar) {
 182     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), CFLocaleRef, calendar, _copyLocale);
 183     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 184     return (CFLocaleRef)CFLocaleCreate(kCFAllocatorSystemDefault, calendar->_localeID);
 185 }
 186
 187 void CFCalendarSetLocale(CFCalendarRef calendar, CFLocaleRef locale) {
 188     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), void, calendar, setLocale:locale);
 189     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 190     __CFGenericValidateType(locale, CFLocaleGetTypeID());
 191     CFStringRef localeID = CFLocaleGetIdentifier(locale);
 192     if (localeID != calendar->_localeID) {
 193         CFRelease(calendar->_localeID);
 194         CFRetain(localeID);
 195         calendar->_localeID = localeID;
 196         if (calendar->_cal) __CFCalendarZapCal(calendar);
 197     }
 198 }
 199
 200 CFTimeZoneRef CFCalendarCopyTimeZone(CFCalendarRef calendar) {
 201     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), CFTimeZoneRef, calendar_copyTimeZone);
 202     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 203     return (CFTimeZoneRef)CFRetain(calendar->_tz);
 204 }
 205
 206 void CFCalendarSetTimeZone(CFCalendarRef calendar, CFTimeZoneRef tz) {
 207     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), void, calendar, setTimeZone:tz);
 208     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 209     if (tz) __CFGenericValidateType(tz, CFTimeZoneGetTypeID());
 210     if (tz != calendar->_tz) {
 211         CFRelease(calendar->_tz);
 212         calendar->_tz = tz ? (CFTimeZoneRef)CFRetain(tz) : CFTimeZoneCopyDefault();
 213         if (calendar->_cal) __CFCalendarZapCal(calendar);
 214     }
 215 }
 216
 217 CFIndex CFCalendarGetFirstWeekday(CFCalendarRef calendar) {
 218     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), CFIndex, calendar, firstWeekday);
 219     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 220     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 221     if (calendar->_cal) {
 222         return ucal_getAttribute(calendar->_cal, UCAL_FIRST_DAY_OF_WEEK);
 223     }
 224     return -1;
 225 }
 226
 227 void CFCalendarSetFirstWeekday(CFCalendarRef calendar, CFIndex wkdy) {
 228     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), void, calendar, setFirstWeekday:wkdy);
 229     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 230     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 231     if (calendar->_cal) {
 232         ucal_setAttribute(calendar->_cal, UCAL_FIRST_DAY_OF_WEEK, wkdy);
 233     }
 234 }
 235
 236 CFIndex CFCalendarGetMinimumDaysInFirstWeek(CFCalendarRef calendar) {
 237     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), CFIndex, calendar, minimumDaysInFirstWeek);
 238     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 239     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 240     return calendar->_cal ? ucal_getAttribute(calendar->_cal, UCAL_MINIMAL_DAYS_IN_FIRST_WEEK) : -1;
 241 }
 242
 243 void CFCalendarSetMinimumDaysInFirstWeek(CFCalendarRef calendar, CFIndex mwd) {
 244     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), void, calendar, setMinimumDaysInFirstWeek:mwd);
 245     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 246     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 247     if (calendar->_cal) ucal_setAttribute(calendar->_cal, UCAL_MINIMAL_DAYS_IN_FIRST_WEEK, mwd);
 248 }
 249
 250 CFDateRef CFCalendarCopyGregorianStartDate(CFCalendarRef calendar) {
 251     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), CFDateRef, calendar, _gregorianStartDate);
 252     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 253     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 254     UErrorCode status = U_ZERO_ERROR;
 255     UDate udate = calendar->_cal ? ucal_getGregorianChange(calendar->_cal, &status) : 0;
 256     if (calendar->_cal && U_SUCCESS(status)) {
 257         CFAbsoluteTime at = (double)udate / 1000.0 - kCFAbsoluteTimeIntervalSince1970;
 258         return CFDateCreate(CFGetAllocator(calendar), at);
 259     }
 260     return NULL;
 261 }
 262
 263 void CFCalendarSetGregorianStartDate(CFCalendarRef calendar, CFDateRef date) {
 264     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), void, calendar, _setGregorianStartDate:date);
 265     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 266     if (date) __CFGenericValidateType(date, CFDateGetTypeID());
 267     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 268     if (!calendar->_cal) return;
 269     if (!date) {
 270         UErrorCode status = U_ZERO_ERROR;
 271         UCalendar *cal = __CFCalendarCreateUCalendar(calendar->_identifier, calendar->_localeID, calendar->_tz);
 272         UDate udate = cal ? ucal_getGregorianChange(cal, &status) : 0;
 273         if (cal && U_SUCCESS(status)) {
 274             status = U_ZERO_ERROR;
 275             if (calendar->_cal) ucal_setGregorianChange(calendar->_cal, udate, &status);
 276         }
 277         if (cal) ucal_close(cal);
 278     } else {
 279         CFAbsoluteTime at = CFDateGetAbsoluteTime(date);
 280         UDate udate = (at + kCFAbsoluteTimeIntervalSince1970) * 1000.0;
 281         UErrorCode status = U_ZERO_ERROR;
 282         if (calendar->_cal) ucal_setGregorianChange(calendar->_cal, udate, &status);
 283     }
 284 }
 285
 286
 287 static UCalendarDateFields __CFCalendarGetICUFieldCode(CFCalendarUnit unit) {
 288     switch (unit) {
 289     case kCFCalendarUnitEra: return UCAL_ERA;
 290     case kCFCalendarUnitYear: return UCAL_YEAR;
 291     case kCFCalendarUnitMonth: return UCAL_MONTH;
 292     case kCFCalendarUnitDay: return UCAL_DAY_OF_MONTH;
 293     case kCFCalendarUnitHour: return UCAL_HOUR_OF_DAY;
 294     case kCFCalendarUnitMinute: return UCAL_MINUTE;
 295     case kCFCalendarUnitSecond: return UCAL_SECOND;
 296     case kCFCalendarUnitWeek: return UCAL_WEEK_OF_YEAR;
 297     case kCFCalendarUnitWeekOfYear: return UCAL_WEEK_OF_YEAR;
 298     case kCFCalendarUnitWeekOfMonth: return UCAL_WEEK_OF_MONTH;
 299     case kCFCalendarUnitYearForWeekOfYear: return UCAL_YEAR_WOY;
 300     case kCFCalendarUnitWeekday: return UCAL_DAY_OF_WEEK;
 301     case kCFCalendarUnitWeekdayOrdinal: return UCAL_DAY_OF_WEEK_IN_MONTH;
 302     }
 303     return (UCalendarDateFields)-1;
 304 }
 305
 306 static UCalendarDateFields __CFCalendarGetICUFieldCodeFromChar(char ch) {
 307     switch (ch) {
 308     case 'G': return UCAL_ERA;
 309     case 'y': return UCAL_YEAR;
 310     case 'M': return UCAL_MONTH;
 311     case 'd': return UCAL_DAY_OF_MONTH;
 312     case 'h': return UCAL_HOUR;
 313     case 'H': return UCAL_HOUR_OF_DAY;
 314     case 'm': return UCAL_MINUTE;
 315     case 's': return UCAL_SECOND;
 316     case 'S': return UCAL_MILLISECOND;
 317     case 'w': return UCAL_WEEK_OF_YEAR;
 318     case 'W': return UCAL_WEEK_OF_MONTH;
 319     case 'Y': return UCAL_YEAR_WOY;
 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 CFCalendarUnit __CFCalendarGetCalendarUnitFromChar(char ch) {
 330     switch (ch) {
 331     case 'G': return kCFCalendarUnitEra;
 332     case 'y': return kCFCalendarUnitYear;
 333     case 'M': return kCFCalendarUnitMonth;
 334     case 'd': return kCFCalendarUnitDay;
 335     case 'H': return kCFCalendarUnitHour;
 336     case 'm': return kCFCalendarUnitMinute;
 337     case 's': return kCFCalendarUnitSecond;
 338     case 'w': return kCFCalendarUnitWeekOfYear;
 339     case 'W': return kCFCalendarUnitWeekOfMonth;
 340     case 'Y': return kCFCalendarUnitYearForWeekOfYear;
 341     case 'E': return kCFCalendarUnitWeekday;
 342     case 'F': return kCFCalendarUnitWeekdayOrdinal;
 343     }
 344     return (UCalendarDateFields)-1;
 345 }
 346
 347 CFRange CFCalendarGetMinimumRangeOfUnit(CFCalendarRef calendar, CFCalendarUnit unit) {
 348     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), CFRange, calendar, _minimumRangeOfUnit:unit);
 349     CFRange range = {kCFNotFound, kCFNotFound};
 350     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 351     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 352     if (calendar->_cal) {
 353         ucal_clear(calendar->_cal);
 354         UCalendarDateFields field = __CFCalendarGetICUFieldCode(unit);
 355         UErrorCode status = U_ZERO_ERROR;
 356         range.location = ucal_getLimit(calendar->_cal, field, UCAL_GREATEST_MINIMUM, &status);
 357         range.length = ucal_getLimit(calendar->_cal, field, UCAL_LEAST_MAXIMUM, &status) - range.location + 1;
 358         if (UCAL_MONTH == field) range.location++;
 359         if (100000 < range.length) range.length = 100000;
 360     }
 361     return range;
 362 }
 363
 364 CFRange CFCalendarGetMaximumRangeOfUnit(CFCalendarRef calendar, CFCalendarUnit unit) {
 365     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), CFRange, calendar, _maximumRangeOfUnit:unit);
 366     CFRange range = {kCFNotFound, kCFNotFound};
 367     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 368     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 369     if (calendar->_cal) {
 370         ucal_clear(calendar->_cal);
 371         UCalendarDateFields field = __CFCalendarGetICUFieldCode(unit);
 372         UErrorCode status = U_ZERO_ERROR;
 373         range.location = ucal_getLimit(calendar->_cal, field, UCAL_MINIMUM, &status);
 374         range.length = ucal_getLimit(calendar->_cal, field, UCAL_MAXIMUM, &status) - range.location + 1;
 375         if (UCAL_MONTH == field) range.location++;
 376         if (100000 < range.length) range.length = 100000;
 377     }
 378     return range;
 379 }
 380
 381 static void __CFCalendarSetToFirstInstant(CFCalendarRef calendar, CFCalendarUnit unit, CFAbsoluteTime at) {
 382     // Set UCalendar to first instant of unit prior to 'at'
 383     UErrorCode status = U_ZERO_ERROR;
 384     UDate udate = floor((at + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 385     ucal_setMillis(calendar->_cal, udate, &status);
 386     int target_era = INT_MIN;
 387     switch (unit) { // largest to smallest, we set the fields to their minimum value
 388     case kCFCalendarUnitYearForWeekOfYear:;
 389         ucal_set(calendar->_cal, UCAL_WEEK_OF_YEAR, ucal_getLimit(calendar->_cal, UCAL_WEEK_OF_YEAR, UCAL_ACTUAL_MINIMUM, &status));
 390     case kCFCalendarUnitWeek:
 391     case kCFCalendarUnitWeekOfMonth:;
 392     case kCFCalendarUnitWeekOfYear:;
 393         {
 394         // reduce to first day of week, then reduce the rest of the day
 395         int32_t goal = ucal_getAttribute(calendar->_cal, UCAL_FIRST_DAY_OF_WEEK);
 396         int32_t dow = ucal_get(calendar->_cal, UCAL_DAY_OF_WEEK, &status);
 397         while (dow != goal) {
 398             ucal_add(calendar->_cal, UCAL_DAY_OF_MONTH, -1, &status);
 399             dow = ucal_get(calendar->_cal, UCAL_DAY_OF_WEEK, &status);
 400         }
 401         goto day;
 402         }
 403     case kCFCalendarUnitEra:
 404         {
 405         target_era = ucal_get(calendar->_cal, UCAL_ERA, &status);
 406         ucal_set(calendar->_cal, UCAL_YEAR, ucal_getLimit(calendar->_cal, UCAL_YEAR, UCAL_ACTUAL_MINIMUM, &status));
 407         }
 408     case kCFCalendarUnitYear:
 409         ucal_set(calendar->_cal, UCAL_MONTH, ucal_getLimit(calendar->_cal, UCAL_MONTH, UCAL_ACTUAL_MINIMUM, &status));
 410     case kCFCalendarUnitMonth:
 411         ucal_set(calendar->_cal, UCAL_DAY_OF_MONTH, ucal_getLimit(calendar->_cal, UCAL_DAY_OF_MONTH, UCAL_ACTUAL_MINIMUM, &status));
 412     case kCFCalendarUnitWeekday:
 413     case kCFCalendarUnitDay:
 414     day:;
 415         ucal_set(calendar->_cal, UCAL_HOUR_OF_DAY, ucal_getLimit(calendar->_cal, UCAL_HOUR_OF_DAY, UCAL_ACTUAL_MINIMUM, &status));
 416     case kCFCalendarUnitHour:
 417         ucal_set(calendar->_cal, UCAL_MINUTE, ucal_getLimit(calendar->_cal, UCAL_MINUTE, UCAL_ACTUAL_MINIMUM, &status));
 418     case kCFCalendarUnitMinute:
 419         ucal_set(calendar->_cal, UCAL_SECOND, ucal_getLimit(calendar->_cal, UCAL_SECOND, UCAL_ACTUAL_MINIMUM, &status));
 420     case kCFCalendarUnitSecond:
 421         ucal_set(calendar->_cal, UCAL_MILLISECOND, 0);
 422     }
 423     if (INT_MIN != target_era && ucal_get(calendar->_cal, UCAL_ERA, &status) < target_era) {
 424         // In the Japanese calendar, and possibly others, eras don't necessarily
 425         // start on the first day of a year, so the previous code may have backed
 426         // up into the previous era, and we have to correct forward.
 427         UDate bad_udate = ucal_getMillis(calendar->_cal, &status);
 428         ucal_add(calendar->_cal, UCAL_MONTH, 1, &status);
 429         while (ucal_get(calendar->_cal, UCAL_ERA, &status) < target_era) {
 430             bad_udate = ucal_getMillis(calendar->_cal, &status);
 431             ucal_add(calendar->_cal, UCAL_MONTH, 1, &status);
 432         }
 433         udate = ucal_getMillis(calendar->_cal, &status);
 434         // target date is between bad_udate and udate
 435         for (;;) {
 436             UDate test_udate = (udate + bad_udate) / 2;
 437             ucal_setMillis(calendar->_cal, test_udate, &status);
 438             if (ucal_get(calendar->_cal, UCAL_ERA, &status) < target_era) {
 439                 bad_udate = test_udate;
 440             } else {
 441                 udate = test_udate;
 442             }
 443             if (fabs(udate - bad_udate) < 1000) break;
 444         }
 445         do {
 446             bad_udate = floor((bad_udate + 1000) / 1000) * 1000;
 447             ucal_setMillis(calendar->_cal, bad_udate, &status);
 448         } while (ucal_get(calendar->_cal, UCAL_ERA, &status) < target_era);
 449     }
 450 }
 451
 452 static Boolean __validUnits(CFCalendarUnit smaller, CFCalendarUnit bigger) {
 453     switch (bigger) {
 454     case kCFCalendarUnitEra:
 455         if (kCFCalendarUnitEra == smaller) return false;
 456         if (kCFCalendarUnitWeekday == smaller) return false;
 457         if (kCFCalendarUnitMinute == smaller) return false;     // this causes CFIndex overflow in range.length
 458         if (kCFCalendarUnitSecond == smaller) return false;     // this causes CFIndex overflow in range.length
 459         return true;
 460     case kCFCalendarUnitYearForWeekOfYear:
 461     case kCFCalendarUnitYear:
 462         if (kCFCalendarUnitEra == smaller) return false;
 463         if (kCFCalendarUnitYear == smaller) return false;
 464         if (kCFCalendarUnitYearForWeekOfYear == smaller) return false;
 465         if (kCFCalendarUnitWeekday == smaller) return false;
 466         return true;
 467     case kCFCalendarUnitMonth:
 468         if (kCFCalendarUnitEra == smaller) return false;
 469         if (kCFCalendarUnitYear == smaller) return false;
 470         if (kCFCalendarUnitMonth == smaller) return false;
 471         if (kCFCalendarUnitWeekday == smaller) return false;
 472         return true;
 473     case kCFCalendarUnitDay:
 474         if (kCFCalendarUnitHour == smaller) return true;
 475         if (kCFCalendarUnitMinute == smaller) return true;
 476         if (kCFCalendarUnitSecond == smaller) return true;
 477         return false;
 478     case kCFCalendarUnitHour:
 479         if (kCFCalendarUnitMinute == smaller) return true;
 480         if (kCFCalendarUnitSecond == smaller) return true;
 481         return false;
 482     case kCFCalendarUnitMinute:
 483         if (kCFCalendarUnitSecond == smaller) return true;
 484         return false;
 485     case kCFCalendarUnitWeek:
 486     case kCFCalendarUnitWeekOfMonth:
 487     case kCFCalendarUnitWeekOfYear:
 488         if (kCFCalendarUnitWeekday == smaller) return true;
 489         if (kCFCalendarUnitDay == smaller) return true;
 490         if (kCFCalendarUnitHour == smaller) return true;
 491         if (kCFCalendarUnitMinute == smaller) return true;
 492         if (kCFCalendarUnitSecond == smaller) return true;
 493         return false;
 494     case kCFCalendarUnitSecond:
 495     case kCFCalendarUnitWeekday:
 496     case kCFCalendarUnitWeekdayOrdinal:
 497         return false;
 498     }
 499     return false;
 500 };
 501
 502 static CFRange __CFCalendarGetRangeOfUnit2(CFCalendarRef calendar, CFCalendarUnit smallerUnit, CFCalendarUnit biggerUnit, CFAbsoluteTime at) __attribute__((noinline));
 503 static CFRange __CFCalendarGetRangeOfUnit2(CFCalendarRef calendar, CFCalendarUnit smallerUnit, CFCalendarUnit biggerUnit, CFAbsoluteTime at) {
 504     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), CFRange, calendar, _rangeOfUnit:smallerUnit inUnit:biggerUnit forAT:at);
 505     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 506     CFRange range = {kCFNotFound, kCFNotFound};
 507     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 508     if (calendar->_cal) {
 509         switch (smallerUnit) {
 510         case kCFCalendarUnitSecond:
 511             switch (biggerUnit) {
 512             case kCFCalendarUnitMinute:
 513             case kCFCalendarUnitHour:
 514             case kCFCalendarUnitDay:
 515             case kCFCalendarUnitWeekday:
 516             case kCFCalendarUnitWeek:
 517             case kCFCalendarUnitMonth:
 518             case kCFCalendarUnitYear:
 519             case kCFCalendarUnitEra:
 520                 // goto calculate;
 521                 range.location = 0;
 522                 range.length = 60;
 523                 break;
 524             }
 525             break;
 526         case kCFCalendarUnitMinute:
 527             switch (biggerUnit) {
 528             case kCFCalendarUnitHour:
 529             case kCFCalendarUnitDay:
 530             case kCFCalendarUnitWeekday:
 531             case kCFCalendarUnitWeek:
 532             case kCFCalendarUnitMonth:
 533             case kCFCalendarUnitYear:
 534             case kCFCalendarUnitEra:
 535                 // goto calculate;
 536                 range.location = 0;
 537                 range.length = 60;
 538                 break;
 539             }
 540             break;
 541         case kCFCalendarUnitHour:
 542             switch (biggerUnit) {
 543             case kCFCalendarUnitDay:
 544             case kCFCalendarUnitWeekday:
 545             case kCFCalendarUnitWeek:
 546             case kCFCalendarUnitMonth:
 547             case kCFCalendarUnitYear:
 548             case kCFCalendarUnitEra:
 549                 // goto calculate;
 550                 range.location = 0;
 551                 range.length = 24;
 552                 break;
 553             }
 554             break;
 555         case kCFCalendarUnitDay:
 556             switch (biggerUnit) {
 557             case kCFCalendarUnitWeek:
 558             case kCFCalendarUnitMonth:
 559             case kCFCalendarUnitYear:
 560             case kCFCalendarUnitEra:
 561                 goto calculate;
 562                 break;
 563             }
 564             break;
 565         case kCFCalendarUnitWeekday:
 566             switch (biggerUnit) {
 567             case kCFCalendarUnitWeek:
 568             case kCFCalendarUnitMonth:
 569             case kCFCalendarUnitYear:
 570             case kCFCalendarUnitEra:
 571                 goto calculate;
 572                 break;
 573             }
 574             break;
 575         case kCFCalendarUnitWeekdayOrdinal:
 576             switch (biggerUnit) {
 577             case kCFCalendarUnitMonth:
 578             case kCFCalendarUnitYear:
 579             case kCFCalendarUnitEra:
 580                 goto calculate;
 581                 break;
 582             }
 583             break;
 584         case kCFCalendarUnitWeek:
 585             switch (biggerUnit) {
 586             case kCFCalendarUnitMonth:
 587             case kCFCalendarUnitYear:
 588             case kCFCalendarUnitEra:
 589                 goto calculate;
 590                 break;
 591             }
 592             break;
 593         case kCFCalendarUnitMonth:
 594             switch (biggerUnit) {
 595             case kCFCalendarUnitYear:
 596             case kCFCalendarUnitEra:
 597                 goto calculate;
 598                 break;
 599             }
 600             break;
 601         case kCFCalendarUnitYear:
 602             switch (biggerUnit) {
 603             case kCFCalendarUnitEra:
 604                 goto calculate;
 605                 break;
 606             }
 607             break;
 608         case kCFCalendarUnitEra:
 609             break;
 610         }
 611     }
 612     return range;
 613
 614     calculate:;
 615     ucal_clear(calendar->_cal);
 616     UCalendarDateFields smallField = __CFCalendarGetICUFieldCode(smallerUnit);
 617     UCalendarDateFields bigField = __CFCalendarGetICUFieldCode(biggerUnit);
 618     UCalendarDateFields yearField = __CFCalendarGetICUFieldCode(kCFCalendarUnitYear);
 619     UCalendarDateFields fieldToAdd = smallField;
 620     if (kCFCalendarUnitWeekday == smallerUnit) {
 621         fieldToAdd = __CFCalendarGetICUFieldCode(kCFCalendarUnitDay);
 622     }
 623     int32_t dow = -1;
 624     if (kCFCalendarUnitWeekdayOrdinal == smallerUnit) {
 625         UErrorCode status = U_ZERO_ERROR;
 626         UDate udate = floor((at + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 627         ucal_setMillis(calendar->_cal, udate, &status);
 628         dow = ucal_get(calendar->_cal, UCAL_DAY_OF_WEEK, &status);
 629         fieldToAdd = __CFCalendarGetICUFieldCode(kCFCalendarUnitWeek);
 630     }
 631     // Set calendar to first instant of big unit
 632     __CFCalendarSetToFirstInstant(calendar, biggerUnit, at);
 633     if (kCFCalendarUnitWeekdayOrdinal == smallerUnit) {
 634         UErrorCode status = U_ZERO_ERROR;
 635         // roll day forward to first 'dow'
 636         while (ucal_get(calendar->_cal, (kCFCalendarUnitMonth == biggerUnit) ? UCAL_WEEK_OF_MONTH : UCAL_WEEK_OF_YEAR, &status) != 1) {
 637             ucal_add(calendar->_cal, UCAL_DAY_OF_MONTH, 1, &status);
 638         }
 639         while (ucal_get(calendar->_cal, UCAL_DAY_OF_WEEK, &status) != dow) {
 640             ucal_add(calendar->_cal, UCAL_DAY_OF_MONTH, 1, &status);
 641         }
 642     }
 643     int32_t minSmallValue = INT32_MAX;
 644     int32_t maxSmallValue = INT32_MIN;
 645     UErrorCode status = U_ZERO_ERROR;
 646     int32_t bigValue = ucal_get(calendar->_cal, bigField, &status);
 647     for (;;) {
 648         int32_t smallValue = ucal_get(calendar->_cal, smallField, &status);
 649         if (smallValue < minSmallValue) minSmallValue = smallValue;
 650         if (smallValue > maxSmallValue) maxSmallValue = smallValue;
 651         ucal_add(calendar->_cal, fieldToAdd, 1, &status);
 652         if (bigValue != ucal_get(calendar->_cal, bigField, &status)) break;
 653         if (biggerUnit == kCFCalendarUnitEra && ucal_get(calendar->_cal, yearField, &status) > 10000) break;
 654         // we assume an answer for 10000 years can be extrapolated to 100000 years, to save time
 655     }
 656     status = U_ZERO_ERROR;
 657     range.location = minSmallValue;
 658     if (smallerUnit == kCFCalendarUnitMonth) range.location = 1;
 659     range.length = maxSmallValue - minSmallValue + 1;
 660     if (biggerUnit == kCFCalendarUnitEra && ucal_get(calendar->_cal, yearField, &status) > 10000) range.length = 100000;
 661
 662     return range;
 663 }
 664
 665 CFRange CFCalendarGetRangeOfUnit(CFCalendarRef calendar, CFCalendarUnit smallerUnit, CFCalendarUnit biggerUnit, CFAbsoluteTime at) {
 666         return __CFCalendarGetRangeOfUnit2(calendar, smallerUnit, biggerUnit, at);
 667 }
 668
 669 CFIndex CFCalendarGetOrdinalityOfUnit(CFCalendarRef calendar, CFCalendarUnit smallerUnit, CFCalendarUnit biggerUnit, CFAbsoluteTime at) {
 670     CFIndex result = kCFNotFound;
 671     if (!__validUnits(smallerUnit, biggerUnit)) return result;
 672     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), CFIndex, calendar, _ordinalityOfUnit:smallerUnit inUnit:biggerUnit forAT:at);
 673     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 674     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 675     if (calendar->_cal) {
 676         UErrorCode status = U_ZERO_ERROR;
 677         ucal_clear(calendar->_cal);
 678         if (kCFCalendarUnitWeek == smallerUnit && kCFCalendarUnitYear == biggerUnit) {
 679             UDate udate = floor((at + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 680             ucal_setMillis(calendar->_cal, udate, &status);
 681             int32_t val = ucal_get(calendar->_cal, UCAL_WEEK_OF_YEAR, &status);
 682             return val;
 683         } else if (kCFCalendarUnitWeek == smallerUnit && kCFCalendarUnitMonth == biggerUnit) {
 684             UDate udate = floor((at + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 685             ucal_setMillis(calendar->_cal, udate, &status);
 686             int32_t val = ucal_get(calendar->_cal, UCAL_WEEK_OF_MONTH, &status);
 687             return val;
 688         }
 689         UCalendarDateFields smallField = __CFCalendarGetICUFieldCode(smallerUnit);
 690         // Set calendar to first instant of big unit
 691         __CFCalendarSetToFirstInstant(calendar, biggerUnit, at);
 692         UDate curr = ucal_getMillis(calendar->_cal, &status);
 693         UDate goal = floor((at + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 694         result = 1;
 695         const int multiple_table[] = {0, 0, 16, 19, 24, 26, 24, 28, 14, 14, 14};
 696         int multiple = (1 << multiple_table[flsl(smallerUnit) - 1]);
 697         Boolean divide = false, alwaysDivide = false;
 698         while (curr < goal) {
 699             ucal_add(calendar->_cal, smallField, multiple, &status);
 700             UDate newcurr = ucal_getMillis(calendar->_cal, &status);
 701             if (curr < newcurr && newcurr <= goal) {
 702                 result += multiple;
 703                 curr = newcurr;
 704             } else {
 705                 // Either newcurr is going backwards, or not making
 706                 // progress, or has overshot the goal; reset date
 707                 // and try smaller multiples.
 708                 ucal_setMillis(calendar->_cal, curr, &status);
 709                 divide = true;
 710                 // once we start overshooting the goal, the add at
 711                 // smaller multiples will succeed at most once for
 712                 // each multiple, so we reduce it every time through
 713                 // the loop.
 714                 if (goal < newcurr) alwaysDivide = true;
 715             }
 716             if (divide) {
 717                 multiple = multiple / 2;
 718                 if (0 == multiple) break;
 719                 divide = alwaysDivide;
 720             }
 721         }
 722     }
 723     return result;
 724 }
 725
 726 Boolean _CFCalendarComposeAbsoluteTimeV(CFCalendarRef calendar, /* out */ CFAbsoluteTime *atp, const char *componentDesc, int *vector, int count) {
 727     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 728     if (calendar->_cal) {
 729         UErrorCode status = U_ZERO_ERROR;
 730         ucal_clear(calendar->_cal);
 731         ucal_set(calendar->_cal, UCAL_YEAR, 1);
 732         ucal_set(calendar->_cal, UCAL_MONTH, 0);
 733         ucal_set(calendar->_cal, UCAL_DAY_OF_MONTH, 1);
 734         ucal_set(calendar->_cal, UCAL_HOUR_OF_DAY, 0);
 735         ucal_set(calendar->_cal, UCAL_MINUTE, 0);
 736         ucal_set(calendar->_cal, UCAL_SECOND, 0);
 737         const char *desc = componentDesc;
 738         Boolean doWOY = false;
 739         char ch = *desc;
 740         while (ch) {
 741             UCalendarDateFields field = __CFCalendarGetICUFieldCodeFromChar(ch);
 742             if (UCAL_WEEK_OF_YEAR == field) {
 743                 doWOY = true;
 744             }
 745             desc++;
 746             ch = *desc;
 747         }
 748         desc = componentDesc;
 749         ch = *desc;
 750         while (ch) {
 751             UCalendarDateFields field = __CFCalendarGetICUFieldCodeFromChar(ch);
 752             int value = *vector;
 753             if (UCAL_YEAR == field && doWOY) field = UCAL_YEAR_WOY;
 754             if (UCAL_MONTH == field) value--;
 755             ucal_set(calendar->_cal, field, value);
 756             vector++;
 757             desc++;
 758             ch = *desc;
 759         }
 760         UDate udate = ucal_getMillis(calendar->_cal, &status);
 761         CFAbsoluteTime at = (udate / 1000.0) - kCFAbsoluteTimeIntervalSince1970;
 762         if (atp) *atp = at;
 763         return U_SUCCESS(status) ? true : false;
 764     }
 765     return false;
 766 }
 767
 768 Boolean _CFCalendarDecomposeAbsoluteTimeV(CFCalendarRef calendar, CFAbsoluteTime at, const char *componentDesc, int **vector, int count) {
 769     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 770     if (calendar->_cal) {
 771         UErrorCode status = U_ZERO_ERROR;
 772         ucal_clear(calendar->_cal);
 773         UDate udate = floor((at + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 774         ucal_setMillis(calendar->_cal, udate, &status);
 775         char ch = *componentDesc;
 776         while (ch) {
 777             UCalendarDateFields field = __CFCalendarGetICUFieldCodeFromChar(ch);
 778             int value = ucal_get(calendar->_cal, field, &status);
 779             if (UCAL_MONTH == field) value++;
 780             *(*vector) = value;
 781             vector++;
 782             componentDesc++;
 783             ch = *componentDesc;
 784         }
 785         return U_SUCCESS(status) ? true : false;
 786     }
 787     return false;
 788 }
 789
 790 Boolean _CFCalendarAddComponentsV(CFCalendarRef calendar, /* inout */ CFAbsoluteTime *atp, CFOptionFlags options, const char *componentDesc, int *vector, int count) {
 791     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 792     if (calendar->_cal) {
 793         UErrorCode status = U_ZERO_ERROR;
 794         ucal_clear(calendar->_cal);
 795         UDate udate = floor((*atp + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 796         ucal_setMillis(calendar->_cal, udate, &status);
 797         char ch = *componentDesc;
 798         while (ch) {
 799             UCalendarDateFields field = __CFCalendarGetICUFieldCodeFromChar(ch);
 800             int amount = *vector;
 801             if (options & kCFCalendarComponentsWrap) {
 802                 ucal_roll(calendar->_cal, field, amount, &status);
 803             } else {
 804                 ucal_add(calendar->_cal, field, amount, &status);
 805             }
 806             vector++;
 807             componentDesc++;
 808             ch = *componentDesc;
 809         }
 810         udate = ucal_getMillis(calendar->_cal, &status);
 811         *atp = (udate / 1000.0) - kCFAbsoluteTimeIntervalSince1970;
 812         return U_SUCCESS(status) ? true : false;
 813     }
 814     return false;
 815 }
 816
 817 Boolean _CFCalendarGetComponentDifferenceV(CFCalendarRef calendar, CFAbsoluteTime startingAT, CFAbsoluteTime resultAT, CFOptionFlags options, const char *componentDesc, int **vector, int count) {
 818     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 819     if (calendar->_cal) {
 820         UErrorCode status = U_ZERO_ERROR;
 821         ucal_clear(calendar->_cal);
 822         UDate curr = floor((startingAT + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 823         UDate goal = floor((resultAT + kCFAbsoluteTimeIntervalSince1970) * 1000.0);
 824         ucal_setMillis(calendar->_cal, curr, &status);
 825         int direction = (startingAT <= resultAT) ? 1 : -1;
 826         char ch = *componentDesc;
 827         while (ch) {
 828             UCalendarDateFields field = __CFCalendarGetICUFieldCodeFromChar(ch);
 829             const int multiple_table[] = {0, 0, 16, 19, 24, 26, 24, 28, 14, 14, 14};
 830             int multiple = direction * (1 << multiple_table[flsl(__CFCalendarGetCalendarUnitFromChar(ch)) - 1]);
 831             Boolean divide = false, alwaysDivide = false;
 832             int result = 0;
 833             while ((direction > 0 && curr < goal) || (direction < 0 && goal < curr)) {
 834                 ucal_add(calendar->_cal, field, multiple, &status);
 835                 UDate newcurr = ucal_getMillis(calendar->_cal, &status);
 836                 if ((direction > 0 && curr < newcurr && newcurr <= goal) || (direction < 0 && newcurr < curr && goal <= newcurr)) {
 837                     result += multiple;
 838                     curr = newcurr;
 839                 } else {
 840                     // Either newcurr is going backwards, or not making
 841                     // progress, or has overshot the goal; reset date
 842                     // and try smaller multiples.
 843                     ucal_setMillis(calendar->_cal, curr, &status);
 844                     divide = true;
 845                     // once we start overshooting the goal, the add at
 846                     // smaller multiples will succeed at most once for
 847                     // each multiple, so we reduce it every time through
 848                     // the loop.
 849                     if ((direction > 0 && goal < newcurr) || (direction < 0 && newcurr < goal)) alwaysDivide = true;
 850                 }
 851                 if (divide) {
 852                     multiple = multiple / 2;
 853                     if (0 == multiple) break;
 854                     divide = alwaysDivide;
 855                 }
 856             }
 857             *(*vector) = result;
 858             vector++;
 859             componentDesc++;
 860             ch = *componentDesc;
 861         }
 862         return U_SUCCESS(status) ? true : false;
 863     }
 864     return false;
 865 }
 866
 867 Boolean CFCalendarComposeAbsoluteTime(CFCalendarRef calendar, /* out */ CFAbsoluteTime *atp, const char *componentDesc, ...) {
 868     va_list args;
 869     va_start(args, componentDesc);
 870     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), Boolean, calendar, _composeAbsoluteTime:atp :componentDesc :args);
 871     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 872     int idx, cnt = strlen((char *)componentDesc);
 873     STACK_BUFFER_DECL(int, vector, cnt);
 874     for (idx = 0; idx < cnt; idx++) {
 875         int arg = va_arg(args, int);
 876         vector[idx] = arg;
 877     }
 878     va_end(args);
 879     return _CFCalendarComposeAbsoluteTimeV(calendar, atp, componentDesc, vector, cnt);
 880 }
 881
 882 Boolean CFCalendarDecomposeAbsoluteTime(CFCalendarRef calendar, CFAbsoluteTime at, const char *componentDesc, ...) {
 883     va_list args;
 884     va_start(args, componentDesc);
 885     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), Boolean, calendar, _decomposeAbsoluteTime:at :componentDesc :args);
 886     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 887     int idx, cnt = strlen((char *)componentDesc);
 888     STACK_BUFFER_DECL(int *, vector, cnt);
 889     for (idx = 0; idx < cnt; idx++) {
 890         int *arg = va_arg(args, int *);
 891         vector[idx] = arg;
 892     }
 893     va_end(args);
 894     return _CFCalendarDecomposeAbsoluteTimeV(calendar, at, componentDesc, vector, cnt);
 895 }
 896
 897 Boolean CFCalendarAddComponents(CFCalendarRef calendar, /* inout */ CFAbsoluteTime *atp, CFOptionFlags options, const char *componentDesc, ...) {
 898     va_list args;
 899     va_start(args, componentDesc);
 900     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), Boolean, calendar, _addComponents:atp :options :componentDesc :args);
 901     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 902     int idx, cnt = strlen((char *)componentDesc);
 903     STACK_BUFFER_DECL(int, vector, cnt);
 904     for (idx = 0; idx < cnt; idx++) {
 905         int arg = va_arg(args, int);
 906         vector[idx] = arg;
 907     }
 908     va_end(args);
 909     return _CFCalendarAddComponentsV(calendar, atp, options, componentDesc, vector, cnt);
 910 }
 911
 912 Boolean CFCalendarGetComponentDifference(CFCalendarRef calendar, CFAbsoluteTime startingAT, CFAbsoluteTime resultAT, CFOptionFlags options, const char *componentDesc, ...) {
 913     va_list args;
 914     va_start(args, componentDesc);
 915     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), Boolean, calendar, _diffComponents:startingAT :resultAT :options :componentDesc :args);
 916     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 917     int idx, cnt = strlen((char *)componentDesc);
 918     STACK_BUFFER_DECL(int *, vector, cnt);
 919     for (idx = 0; idx < cnt; idx++) {
 920         int *arg = va_arg(args, int *);
 921         vector[idx] = arg;
 922     }
 923     va_end(args);
 924     Boolean ret = _CFCalendarGetComponentDifferenceV(calendar, startingAT, resultAT, options, componentDesc, vector, cnt);
 925     return ret;
 926 }
 927
 928 Boolean CFCalendarGetTimeRangeOfUnit(CFCalendarRef calendar, CFCalendarUnit unit, CFAbsoluteTime at, CFAbsoluteTime *startp, CFTimeInterval *tip) {
 929     CF_OBJC_FUNCDISPATCHV(CFCalendarGetTypeID(), Boolean, calendar, _rangeOfUnit:unit startTime:startp interval:tip forAT:at);
 930     __CFGenericValidateType(calendar, CFCalendarGetTypeID());
 931     if (kCFCalendarUnitWeekdayOrdinal == unit) return false;
 932     if (kCFCalendarUnitWeekday == unit) unit = kCFCalendarUnitDay;
 933     if (!calendar->_cal) __CFCalendarSetupCal(calendar);
 934     if (calendar->_cal) {
 935         ucal_clear(calendar->_cal);
 936         __CFCalendarSetToFirstInstant(calendar, unit, at);
 937         UErrorCode status = U_ZERO_ERROR;
 938         UDate start = ucal_getMillis(calendar->_cal, &status);
 939         UCalendarDateFields field = __CFCalendarGetICUFieldCode(unit);
 940         ucal_add(calendar->_cal, field, 1, &status);
 941         UDate end = ucal_getMillis(calendar->_cal, &status);
 942         if (end == start && kCFCalendarUnitEra == unit) {
 943             // ICU refuses to do the addition, probably because we are
 944             // at the limit of UCAL_ERA.  Use alternate strategy.
 945             CFIndex limit = ucal_getLimit(calendar->_cal, UCAL_YEAR, UCAL_MAXIMUM, &status);
 946             if (100000 < limit) limit = 100000;
 947             ucal_add(calendar->_cal, UCAL_YEAR, limit, &status);
 948             end = ucal_getMillis(calendar->_cal, &status);
 949         }
 950         if (U_SUCCESS(status)) {
 951             if (startp) *startp = (double)start / 1000.0 - kCFAbsoluteTimeIntervalSince1970;
 952             if (tip) *tip = (double)(end - start) / 1000.0;
 953             return true;
 954         }
 955     }
 956
 957     return false;
 958 }
 959
 960 #undef BUFFER_SIZE
 961