time.h

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00001 ///
00002 /// \file       time.h
00003 ///             Time related conversion routines.
00004 ///             time_t is the POSIX time.
00005 ///             min1900_t is the minutes from Jan 1, 1900
00006 ///
00007 
00008 /*
00009     Copyright (C) 2005-2009, Net Direct Inc. (http://www.netdirect.ca/)
00010 
00011     This program is free software; you can redistribute it and/or modify
00012     it under the terms of the GNU General Public License as published by
00013     the Free Software Foundation; either version 2 of the License, or
00014     (at your option) any later version.
00015 
00016     This program is distributed in the hope that it will be useful,
00017     but WITHOUT ANY WARRANTY; without even the implied warranty of
00018     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00019 
00020     See the GNU General Public License in the COPYING file at the
00021     root directory of this project for more details.
00022 */
00023 
00024 #ifndef __BARRY_TIME_H__
00025 #define __BARRY_TIME_H__
00026 
00027 #include "dll.h"
00028 #include <time.h>
00029 #include <stdint.h>
00030 
00031 //
00032 // Calculate the number of minutes between Jan 01, 1900 and Jan 01, 1970
00033 //
00034 // There are 17 leap years between 1900 and 1970
00035 //    (1969-1900) / 4 = 17.25
00036 //
00037 // 1900 itself is not a leap year (not divisible by 400)
00038 //
00039 #define DAY_MINUTES (24 * 60)
00040 #define YEAR_MINUTES (365 * DAY_MINUTES)
00041 #define LEAP_YEAR_COUNT ((1970-1901) / 4)
00042 #define YEAR_COUNT (1970 - 1900)
00043 
00044 // therefore, the difference between standard C's time and min1900_t's
00045 // time in minutes:
00046 #define STDC_MIN1900_DIFF (YEAR_COUNT * YEAR_MINUTES + LEAP_YEAR_COUNT * DAY_MINUTES)
00047 
00048 namespace Barry {
00049 
00050 typedef long min1900_t;
00051 
00052 BXEXPORT min1900_t time2min(time_t t);
00053 BXEXPORT time_t min2time(min1900_t m);
00054 
00055 // FIXME - turn TimeZone into a C typedef and wrap this in extern "C"
00056 // so the data can be used in both C and C++ libraries
00057 struct BXEXPORT TimeZone
00058 {
00059         unsigned short Code;
00060         signed short HourOffset;
00061         signed short MinOffset;
00062         const char *Name;
00063 };
00064 
00065 // FIXME - put this somewhere for both C and C++
00066 #define TIME_ZONE_CODE_ERR      0xffff
00067 
00068 BXEXPORT const TimeZone* GetTimeZoneTable();
00069 BXEXPORT const TimeZone* GetTimeZone(unsigned short Code);
00070 BXEXPORT unsigned short GetTimeZoneCode(signed short HourOffset,
00071         signed short MinOffset = 0);
00072         
00073 // Message time conversion stuff
00074 BXEXPORT time_t DayToDate( unsigned short Day );
00075 BXEXPORT time_t Message2Time(uint16_t r_date, uint16_t r_time);
00076 
00077 } // namespace Barry
00078 
00079 #endif
00080 

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