The Tor Browser: intl/icu/source/i18n/gregoimp.cpp@b8a032363ba2 (annotated)

intl/icu/source/i18n/gregoimp.cpp@b8a032363ba2 (annotated)

intl/icu/source/i18n/gregoimp.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
  **********************************************************************
  * Copyright (c) 2003-2008, International Business Machines
  * Corporation and others.  All Rights Reserved.
  **********************************************************************
  * Author: Alan Liu
  * Created: September 2 2003
  * Since: ICU 2.8
  **********************************************************************
  */
 #include "gregoimp.h"
 #if !UCONFIG_NO_FORMATTING
 #include "unicode/ucal.h"
 #include "uresimp.h"
 #include "cstring.h"
 #include "uassert.h"
 #if defined(U_DEBUG_CALDATA)
 #include <stdio.h>
 #endif
 U_NAMESPACE_BEGIN
 int32_t ClockMath::floorDivide(int32_t numerator, int32_t denominator) {
     return (numerator >= 0) ?
         numerator / denominator : ((numerator + 1) / denominator) - 1;
 }
 int32_t ClockMath::floorDivide(double numerator, int32_t denominator,
                           int32_t& remainder) {
     double quotient;
     quotient = uprv_floor(numerator / denominator);
     remainder = (int32_t) (numerator - (quotient * denominator));
     return (int32_t) quotient;
 }
 double ClockMath::floorDivide(double dividend, double divisor,
                          double& remainder) {
     // Only designed to work for positive divisors
     U_ASSERT(divisor > 0);
     double quotient = floorDivide(dividend, divisor);
     remainder = dividend - (quotient * divisor);
     // N.B. For certain large dividends, on certain platforms, there
     // is a bug such that the quotient is off by one.  If you doubt
     // this to be true, set a breakpoint below and run cintltst.
     if (remainder < 0 || remainder >= divisor) {
         // E.g. 6.7317038241449352e+022 / 86400000.0 is wrong on my
         // machine (too high by one).  4.1792057231752762e+024 /
         // 86400000.0 is wrong the other way (too low).
         double q = quotient;
         quotient += (remainder < 0) ? -1 : +1;
         if (q == quotient) {
             // For quotients > ~2^53, we won't be able to add or
             // subtract one, since the LSB of the mantissa will be >
             // 2^0; that is, the exponent (base 2) will be larger than
             // the length, in bits, of the mantissa.  In that case, we
             // can't give a correct answer, so we set the remainder to
             // zero.  This has the desired effect of making extreme
             // values give back an approximate answer rather than
             // crashing.  For example, UDate values above a ~10^25
             // might all have a time of midnight.
             remainder = 0;
         } else {
             remainder = dividend - (quotient * divisor);
         }
     }
     U_ASSERT(0 <= remainder && remainder < divisor);
     return quotient;
 }
 const int32_t JULIAN_1_CE    = 1721426; // January 1, 1 CE Gregorian
 const int32_t JULIAN_1970_CE = 2440588; // January 1, 1970 CE Gregorian
 const int16_t Grego::DAYS_BEFORE[24] =
     {0,31,59,90,120,151,181,212,243,273,304,334,
 ,31,60,91,121,152,182,213,244,274,305,335};
 const int8_t Grego::MONTH_LENGTH[24] =
     {31,28,31,30,31,30,31,31,30,31,30,31,
 ,29,31,30,31,30,31,31,30,31,30,31};
 double Grego::fieldsToDay(int32_t year, int32_t month, int32_t dom) {
     int32_t y = year - 1;
     double julian = 365 * y + ClockMath::floorDivide(y, 4) + (JULIAN_1_CE - 3) + // Julian cal
         ClockMath::floorDivide(y, 400) - ClockMath::floorDivide(y, 100) + 2 + // => Gregorian cal
         DAYS_BEFORE[month + (isLeapYear(year) ? 12 : 0)] + dom; // => month/dom
     return julian - JULIAN_1970_CE; // JD => epoch day
 }
 void Grego::dayToFields(double day, int32_t& year, int32_t& month,
                         int32_t& dom, int32_t& dow, int32_t& doy) {
     // Convert from 1970 CE epoch to 1 CE epoch (Gregorian calendar)
     day += JULIAN_1970_CE - JULIAN_1_CE;
     // Convert from the day number to the multiple radix
     // representation.  We use 400-year, 100-year, and 4-year cycles.
     // For example, the 4-year cycle has 4 years + 1 leap day; giving
     // 1461 == 365*4 + 1 days.
     int32_t n400 = ClockMath::floorDivide(day, 146097, doy); // 400-year cycle length
     int32_t n100 = ClockMath::floorDivide(doy, 36524, doy); // 100-year cycle length
     int32_t n4   = ClockMath::floorDivide(doy, 1461, doy); // 4-year cycle length
     int32_t n1   = ClockMath::floorDivide(doy, 365, doy);
     year = 400*n400 + 100*n100 + 4*n4 + n1;
     if (n100 == 4 || n1 == 4) {
         doy = 365; // Dec 31 at end of 4- or 400-year cycle
     } else {
         ++year;
     }
     UBool isLeap = isLeapYear(year);
     // Gregorian day zero is a Monday.
     dow = (int32_t) uprv_fmod(day + 1, 7);
     dow += (dow < 0) ? (UCAL_SUNDAY + 7) : UCAL_SUNDAY;
     // Common Julian/Gregorian calculation
     int32_t correction = 0;
     int32_t march1 = isLeap ? 60 : 59; // zero-based DOY for March 1
     if (doy >= march1) {
         correction = isLeap ? 1 : 2;
     }
     month = (12 * (doy + correction) + 6) / 367; // zero-based month
     dom = doy - DAYS_BEFORE[month + (isLeap ? 12 : 0)] + 1; // one-based DOM
     doy++; // one-based doy
 }
 void Grego::timeToFields(UDate time, int32_t& year, int32_t& month,
                         int32_t& dom, int32_t& dow, int32_t& doy, int32_t& mid) {
     double millisInDay;
     double day = ClockMath::floorDivide((double)time, (double)U_MILLIS_PER_DAY, millisInDay);
     mid = (int32_t)millisInDay;
     dayToFields(day, year, month, dom, dow, doy);
 }
 int32_t Grego::dayOfWeek(double day) {
     int32_t dow;
     ClockMath::floorDivide(day + UCAL_THURSDAY, 7, dow);
     return (dow == 0) ? UCAL_SATURDAY : dow;
 }
 int32_t Grego::dayOfWeekInMonth(int32_t year, int32_t month, int32_t dom) {
     int32_t weekInMonth = (dom + 6)/7;
     if (weekInMonth == 4) {
         if (dom + 7 > monthLength(year, month)) {
             weekInMonth = -1;
         }
     } else if (weekInMonth == 5) {
         weekInMonth = -1;
     }
     return weekInMonth;
 }
 /* ---- CalendarData ------ */
 #define U_CALENDAR_KEY "calendar"
 #define U_GREGORIAN_KEY "gregorian"
 #define U_FORMAT_KEY "format"
 #define U_DEFAULT_KEY "default"
 #define U_CALENDAR_DATA ((char*)0)
 // CalendarData::CalendarData(const Locale& loc, UErrorCode& status)
 //   : fFillin(NULL), fBundle(NULL), fFallback(NULL) {
 //   initData(loc.getBaseName(), (char*) "???", status);
 // }
 CalendarData::CalendarData(const Locale& loc, const char *type, UErrorCode& status)
   : fFillin(NULL), fOtherFillin(NULL), fBundle(NULL), fFallback(NULL) {
   initData(loc.getBaseName(), type, status);
 }
 void CalendarData::initData(const char *locale, const char *type, UErrorCode& status) {
   fOtherFillin = ures_open(U_CALENDAR_DATA, locale, &status);
   fFillin = ures_getByKey(fOtherFillin, U_CALENDAR_KEY, fFillin, &status);
   if((type != NULL) &&
      (*type != '\0') &&
      (uprv_strcmp(type, U_GREGORIAN_KEY)))
   {
     fBundle = ures_getByKeyWithFallback(fFillin, type, NULL, &status);
     fFallback = ures_getByKeyWithFallback(fFillin, U_GREGORIAN_KEY, NULL, &status);
 #if defined (U_DEBUG_CALDATA)
     fprintf(stderr, "%p: CalendarData(%s, %s, %s) -> main(%p, %s)=%s, fallback(%p, %s)=%s\n",
             this, locale, type, u_errorName(status), fBundle, type, fBundle?ures_getLocale(fBundle, &status):"",
             fFallback, U_GREGORIAN_KEY, fFallback?ures_getLocale(fFallback, &status):"");
 #endif
   } else {
     fBundle = ures_getByKeyWithFallback(fFillin, U_GREGORIAN_KEY, NULL, &status);
 #if defined (U_DEBUG_CALDATA)
     fprintf(stderr, "%p: CalendarData(%s, %s, %s) -> main(%p, %s)=%s, fallback = NULL\n",
             this, locale, type, u_errorName(status), fBundle, U_GREGORIAN_KEY, fBundle?ures_getLocale(fBundle, &status):"" );
 #endif
   }
 }
 CalendarData::~CalendarData() {
     ures_close(fFillin);
     ures_close(fBundle);
     ures_close(fFallback);
     ures_close(fOtherFillin);
 }
 UResourceBundle*
 CalendarData::getByKey(const char *key, UErrorCode& status) {
     if(U_FAILURE(status)) {
         return NULL;
     }
     if(fBundle) {
         fFillin = ures_getByKeyWithFallback(fBundle, key, fFillin, &status);
 #if defined (U_DEBUG_CALDATA)
         fprintf(stderr, "%p: get %s -> %s - from MAIN %s\n",this, key, u_errorName(status), ures_getLocale(fFillin, &status));
 #endif
     }
     if(fFallback && (status == U_MISSING_RESOURCE_ERROR)) {
         status = U_ZERO_ERROR; // retry with fallback (gregorian)
         fFillin = ures_getByKeyWithFallback(fFallback, key, fFillin, &status);
 #if defined (U_DEBUG_CALDATA)
         fprintf(stderr, "%p: get %s -> %s - from FALLBACK %s\n",this, key, u_errorName(status), ures_getLocale(fFillin, &status));
 #endif
     }
     return fFillin;
 }
 UResourceBundle* CalendarData::getByKey2(const char *key, const char *subKey, UErrorCode& status) {
     if(U_FAILURE(status)) {
         return NULL;
     }
     if(fBundle) {
 #if defined (U_DEBUG_CALDATA)
         fprintf(stderr, "%p: //\n");
 #endif
         fFillin = ures_getByKeyWithFallback(fBundle, key, fFillin, &status);
         fOtherFillin = ures_getByKeyWithFallback(fFillin, U_FORMAT_KEY, fOtherFillin, &status);
         fFillin = ures_getByKeyWithFallback(fOtherFillin, subKey, fFillin, &status);
 #if defined (U_DEBUG_CALDATA)
         fprintf(stderr, "%p: get %s/format/%s -> %s - from MAIN %s\n", this, key, subKey, u_errorName(status), ures_getLocale(fFillin, &status));
 #endif
     }
     if(fFallback && (status == U_MISSING_RESOURCE_ERROR)) {
         status = U_ZERO_ERROR; // retry with fallback (gregorian)
         fFillin = ures_getByKeyWithFallback(fFallback, key, fFillin, &status);
         fOtherFillin = ures_getByKeyWithFallback(fFillin, U_FORMAT_KEY, fOtherFillin, &status);
         fFillin = ures_getByKeyWithFallback(fOtherFillin, subKey, fFillin, &status);
 #if defined (U_DEBUG_CALDATA)
         fprintf(stderr, "%p: get %s/format/%s -> %s - from FALLBACK %s\n",this, key, subKey, u_errorName(status), ures_getLocale(fFillin,&status));
 #endif
     }
 //// handling of 'default' keyword on failure: Commented out for 3.0.
 //   if((status == U_MISSING_RESOURCE_ERROR) &&
 //      uprv_strcmp(subKey,U_DEFAULT_KEY)) { // avoid recursion
 // #if defined (U_DEBUG_CALDATA)
 //     fprintf(stderr, "%p: - attempting fallback -\n", this);
 //     fflush(stderr);
 // #endif
 //     UErrorCode subStatus = U_ZERO_ERROR;
 //     int32_t len;
 //     char kwBuf[128] = "";
 //     const UChar *kw;
 //     /* fFillin = */ getByKey2(key, U_DEFAULT_KEY, subStatus);
 //     kw = ures_getString(fFillin, &len, &subStatus);
 //     if(len>126) { // too big
 //       len = 0;
 //     }
 //     if(U_SUCCESS(subStatus) && (len>0)) {
 //       u_UCharsToChars(kw, kwBuf, len+1);
 //       if(*kwBuf && uprv_strcmp(kwBuf,subKey)) {
 // #if defined (U_DEBUG_CALDATA)
 //         fprintf(stderr, "%p: trying  %s/format/default -> \"%s\"\n",this, key, kwBuf);
 // #endif
 //         // now try again with the default
 //         status = U_ZERO_ERROR;
 //         /* fFillin = */ getByKey2(key, kwBuf, status);
 //       }
 // #if defined (U_DEBUG_CALDATA)
 //     } else {
 //       fprintf(stderr, "%p: could not load  %s/format/default  - fail out (%s)\n",this, key, kwBuf, u_errorName(status));
 // #endif
 //     }
 //   }
     return fFillin;
 }
 UResourceBundle* CalendarData::getByKey3(const char *key, const char *contextKey, const char *subKey, UErrorCode& status) {
     if(U_FAILURE(status)) {
         return NULL;
     }
     if(fBundle) {
 #if defined (U_DEBUG_CALDATA)
         fprintf(stderr, "%p: //\n");
 #endif
         fFillin = ures_getByKeyWithFallback(fBundle, key, fFillin, &status);
         fOtherFillin = ures_getByKeyWithFallback(fFillin, contextKey, fOtherFillin, &status);
         fFillin = ures_getByKeyWithFallback(fOtherFillin, subKey, fFillin, &status);
 #if defined (U_DEBUG_CALDATA)
         fprintf(stderr, "%p: get %s/%s/%s -> %s - from MAIN %s\n", this, key, contextKey, subKey, u_errorName(status), ures_getLocale(fFillin, &status));
 #endif
     }
     if(fFallback && (status == U_MISSING_RESOURCE_ERROR)) {
         status = U_ZERO_ERROR; // retry with fallback (gregorian)
         fFillin = ures_getByKeyWithFallback(fFallback, key, fFillin, &status);
         fOtherFillin = ures_getByKeyWithFallback(fFillin, contextKey, fOtherFillin, &status);
         fFillin = ures_getByKeyWithFallback(fOtherFillin, subKey, fFillin, &status);
 #if defined (U_DEBUG_CALDATA)
         fprintf(stderr, "%p: get %s/%s/%s -> %s - from FALLBACK %s\n",this, key, contextKey, subKey, u_errorName(status), ures_getLocale(fFillin,&status));
 #endif
     }
     return fFillin;
 }
 U_NAMESPACE_END
 #endif
 //eof

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intl/icu/source/i18n/gregoimp.cpp@b8a032363ba2 (annotated)

intl/icu/source/i18n/gregoimp.cpp