lotuswordpro/source/filter/localtime.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*************************************************************************
   3  *
   4  *  The Contents of this file are made available subject to the terms of
   5  *  either of the following licenses
   6  *
   7  *         - GNU Lesser General Public License Version 2.1
   8  *         - Sun Industry Standards Source License Version 1.1
   9  *
  10  *  Sun Microsystems Inc., October, 2000
  11  *
  12  *  GNU Lesser General Public License Version 2.1
  13  *  =============================================
  14  *  Copyright 2000 by Sun Microsystems, Inc.
  15  *  901 San Antonio Road, Palo Alto, CA 94303, USA
  16  *
  17  *  This library is free software; you can redistribute it and/or
  18  *  modify it under the terms of the GNU Lesser General Public
  19  *  License version 2.1, as published by the Free Software Foundation.
  20  *
  21  *  This library is distributed in the hope that it will be useful,
  22  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  24  *  Lesser General Public License for more details.
  25  *
  26  *  You should have received a copy of the GNU Lesser General Public
  27  *  License along with this library; if not, write to the Free Software
  28  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  29  *  MA  02111-1307  USA
  30  *
  31  *
  32  *  Sun Industry Standards Source License Version 1.1
  33  *  =================================================
  34  *  The contents of this file are subject to the Sun Industry Standards
  35  *  Source License Version 1.1 (the "License"); You may not use this file
  36  *  except in compliance with the License. You may obtain a copy of the
  37  *  License at http://www.openoffice.org/license.html.
  38  *
  39  *  Software provided under this License is provided on an "AS IS" basis,
  40  *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
  41  *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
  42  *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
  43  *  See the License for the specific provisions governing your rights and
  44  *  obligations concerning the Software.
  45  *
  46  *  The Initial Developer of the Original Code is: IBM Corporation
  47  *
  48  *  Copyright: 2008 by IBM Corporation
  49  *
  50  *  All Rights Reserved.
  51  *
  52  *  Contributor(s): _______________________________________
  53  *
  54  *
  55  ************************************************************************/
  56 #include "localtime.hxx"
  57 #include <limits.h>
  58 #include <unicode/timezone.h>
  59 //End by
  60 const long DAY_SEC =24 * 60 * 60;
  61 const long YEAR_SEC = 365 * DAY_SEC;
  62 const long FOURYEAR_SEC = 4 * YEAR_SEC + DAY_SEC;
  63 #ifndef LONG_MAX
  64 const long LONG_MAX=2147483647;
  65 #endif
  66 //01-01-70 was a Thursday
  67 const long BASE_DOW = 4;
  68
  69 long _lpdays[] = {-1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365};
  70
  71 long _days[] = {-1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364};
  72
  73 bool LtgGmTime(long rtime,LtTm& rtm)
  74 {
  75     if (rtime < 0)
  76     {
  77         return false;
  78     }
  79     //is-current-year-a-leap-year flag
  80     int islpyr = 0;
  81
  82     long tmptim;
  83     long caltim = rtime;
  84     tmptim = (long)(caltim / FOURYEAR_SEC);
  85     caltim -= ((long)tmptim * FOURYEAR_SEC);
  86
  87     //Determine which year of the interval
  88
  89     // 1970, 1974, 1978,...,etc.
  90     tmptim = (tmptim * 4) + 70;
  91
  92     if (caltim >= YEAR_SEC)
  93     {
  94         //1971, 1975, 1979,...,etc.
  95         tmptim++;
  96         caltim -= YEAR_SEC;
  97
  98         if ( caltim >= YEAR_SEC )
  99         {
 100             // 1972, 1976, 1980,...,etc.
 101             tmptim++;
 102             caltim -= YEAR_SEC;
 103
 104             //Note, it takes 366 days-worth of seconds to get past a leap year.
 105             if (caltim >= (YEAR_SEC + DAY_SEC))
 106             {
 107                 //1973, 1977, 1981,...,etc.
 108                 tmptim++;
 109                 caltim -= (YEAR_SEC + DAY_SEC);
 110             }
 111             else
 112             {
 113                 //In a leap year after all, set the flag.
 114                 islpyr++;
 115             }
 116         }
 117     }
 118
 119     //tmptim now holds the value for tm_year. caltim now holds the
 120     //number of elapsed seconds since the beginning of that year.
 121
 122     rtm.tm_year = tmptim;
 123
 124     //Determine days since January 1 (0 - 365). This is the tm_yday value.
 125     //Leave caltim with number of elapsed seconds in that day.
 126
 127     rtm.tm_yday = (long)(caltim / DAY_SEC);
 128     caltim -= (long)(rtm.tm_yday) * DAY_SEC;
 129
 130     //Determine months since January (0 - 11) and day of month (1 - 31)
 131
 132     long* mdays;
 133     if ( islpyr )
 134     {
 135         mdays = _lpdays;
 136     }
 137     else
 138     {
 139         mdays = _days;
 140     }
 141
 142     for ( tmptim = 1 ; mdays[tmptim] < rtm.tm_yday ; tmptim++ ) ;
 143
 144     rtm.tm_mon = --tmptim;
 145
 146     rtm.tm_mday = rtm.tm_yday - mdays[tmptim];
 147
 148     //Determine days since Sunday (0 - 6)
 149
 150     rtm.tm_wday = ((long)(rtime / DAY_SEC) + BASE_DOW) % 7;
 151
 152     //Determine hours since midnight (0 - 23), minutes after the hour
 153     //(0 - 59), and seconds after the minute (0 - 59).
 154
 155     rtm.tm_hour = (long)(caltim / 3600);
 156     caltim -= (long)rtm.tm_hour * 3600;
 157
 158     rtm.tm_min = (long)(caltim / 60);
 159     rtm.tm_sec = (long)(caltim - (rtm.tm_min) * 60);
 160
 161     rtm.tm_isdst = 0;
 162
 163     //adjust year & month
 164     rtm.tm_year += 1900;
 165     ++(rtm.tm_mon);
 166
 167     return true;
 168
 169 };
 170 bool LtgLocalTime(long rtime,LtTm& rtm)
 171 {
 172     if (rtime < 0)
 173     {
 174         return false;
 175     }
 176
 177     if ((rtime > 3 * DAY_SEC)&&(rtime < LONG_MAX - 3 * DAY_SEC))
 178     {
 179         TimeZone* pLocalZone = TimeZone::createDefault();
 180         long offset = (pLocalZone->getRawOffset())/1000;
 181         delete pLocalZone;
 182         long ltime = rtime + offset;
 183         return LtgGmTime(ltime,rtm);
 184     }
 185     return false;
 186 };
 187
 188 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */