src/msw/wince/time.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/wince/time.cpp
   3 // Purpose:     Implements missing time functionality for WinCE
   4 // Author:      Marco Cavallini (MCK) - wx@koansoftware.com
   5 // Modified by:
   6 // Created:     31-08-2003
   7 // RCS-ID:
   8 // Copyright:   (c) Marco Cavallini
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ===========================================================================
  13 // declarations
  14 // ===========================================================================
  15
  16 // ---------------------------------------------------------------------------
  17 // headers
  18 // ---------------------------------------------------------------------------
  19
  20 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  21     #pragma implementation "window.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/msw/wrapwin.h"
  33 #endif
  34
  35 #include "wx/msw/wince/time.h"
  36 #include <winbase.h>
  37
  38 #define is_leap(y)   (y % 4 == 0 && (y % 100 != 0 || y % 400 == 0))
  39 #define SECONDS_IN_ONE_MINUTE      60
  40 #define DAYS_IN_ONE_YEAR          365
  41 #define SECONDS_IN_ONE_MIN         60
  42 #define SECONDS_IN_ONE_HOUR      3600
  43 #define SECONDS_IN_ONE_DAY      86400
  44 #define DEFAULT_TIMEZONE        28800
  45 #define DO_GMTIME                   0
  46 #define DO_LOCALTIME                1
  47
  48
  49 long timezone ; // global variable
  50
  51
  52 ////////////////////////////////////////////////////////////////////////
  53 // Common code for localtime and gmtime (static)
  54 ////////////////////////////////////////////////////////////////////////
  55 static struct tm * __cdecl common_localtime(const time_t * WXUNUSED(t), BOOL bLocal)
  56 {
  57     wxString str ;
  58     SYSTEMTIME SystemTime;
  59     TIME_ZONE_INFORMATION pTz;
  60     static struct tm st_res ;             // data holder
  61     static struct tm * res = &st_res ;    // data pointer
  62     int iLeap;
  63     const unsigned short int __mon_yday[2][13] =
  64     {
  65         // Normal years
  66         { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
  67         // Leap years
  68         { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
  69     };
  70
  71     ::GetLocalTime(&SystemTime) ;
  72     ::GetTimeZoneInformation(&pTz);
  73
  74     ///////////////////////////////////////////////
  75     // Set timezone
  76     timezone = pTz.Bias * SECONDS_IN_ONE_MINUTE ;
  77     ///////////////////////////////////////////////
  78
  79     iLeap = is_leap(SystemTime.wYear) ;
  80
  81     res->tm_hour = SystemTime.wHour;
  82     res->tm_min  = SystemTime.wMinute;
  83     res->tm_sec  = SystemTime.wSecond;
  84
  85     res->tm_mday = SystemTime.wDay;
  86     res->tm_mon = SystemTime.wMonth - 1; // this the correct month but localtime returns month aligned to zero
  87     res->tm_year = SystemTime.wYear;     // this the correct year
  88     res->tm_year = res->tm_year - 1900;  // but localtime returns the value starting at the 1900
  89
  90     res->tm_wday = SystemTime.wDayOfWeek;
  91     res->tm_yday = __mon_yday[iLeap][res->tm_mon] + SystemTime.wDay - 1; // localtime returns year-day aligned to zero
  92
  93     // if localtime behavior and daylight saving
  94     if (bLocal && pTz.DaylightBias != 0)
  95         res->tm_isdst = 1;
  96     else
  97         res->tm_isdst = 0; // without daylight saving or gmtime
  98
  99     return res;
 100 }
 101
 102 ////////////////////////////////////////////////////////////////////////
 103 // Receive the number of seconds elapsed since midnight(00:00:00)
 104 // and convert a time value and corrects for the local time zone
 105 ////////////////////////////////////////////////////////////////////////
 106 struct tm * __cdecl localtime(const time_t * t)
 107 {
 108     return common_localtime(t, DO_LOCALTIME) ;
 109 }
 110
 111 ////////////////////////////////////////////////////////////////////////
 112 // Receives the number of seconds elapsed since midnight(00:00:00)
 113 // and converts a time value WITHOUT correcting for the local time zone
 114 ////////////////////////////////////////////////////////////////////////
 115 struct tm * __cdecl gmtime(const time_t *t)
 116 {
 117     return common_localtime(t, DO_GMTIME) ;
 118 }
 119
 120
 121 ////////////////////////////////////////////////////////////////////////
 122 // Common code for conversion of struct tm into time_t   (static)
 123 ////////////////////////////////////////////////////////////////////////
 124 static time_t __cdecl common_tm_to_time(int day, int month, int year, int hour, int minute, int second)
 125 {
 126     time_t prog = 0 ;
 127     static int mdays[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 } ;
 128
 129     while (--month)
 130     {
 131         prog += mdays[month - 1] ;
 132         if (month == 2 && is_leap(year))
 133             prog++ ;
 134     }
 135
 136     // Calculate seconds in elapsed days
 137     prog = day - 1 ;        // align first day of the year to zero
 138     prog += (DAYS_IN_ONE_YEAR * (year - 1970) + (year - 1901) / 4 - 19) ;
 139     prog *= SECONDS_IN_ONE_DAY ;
 140
 141     // Add Calculated elapsed seconds in the current day
 142     prog += (hour * SECONDS_IN_ONE_HOUR + minute *
 143                                SECONDS_IN_ONE_MIN + second) ;
 144
 145     return prog ;
 146 }
 147
 148
 149 ////////////////////////////////////////////////////////////////////////
 150 // Returns the number of seconds elapsed since
 151 // midnight(00:00:00) of 1 January 1970
 152 ////////////////////////////////////////////////////////////////////////
 153 time_t __cdecl time(time_t *t)
 154 {
 155     time_t prog = 0 ;
 156
 157     if (t != NULL)
 158     {
 159         SYSTEMTIME SystemTime;
 160
 161         ::GetLocalTime(&SystemTime) ;
 162         prog = common_tm_to_time(SystemTime.wDay, SystemTime.wMonth, SystemTime.wYear,
 163                                  SystemTime.wHour, SystemTime.wMinute, SystemTime.wSecond) ;
 164         *t = prog ;
 165     }
 166
 167     return prog ;
 168 }
 169
 170 ////////////////////////////////////////////////////////////////////////
 171 // Converts the local time provided by struct tm
 172 // into a time_t calendar value
 173 ////////////////////////////////////////////////////////////////////////
 174 time_t __cdecl mktime(struct tm *t)
 175 {
 176     return (common_tm_to_time(t->tm_mday, t->tm_mon+1, t->tm_year+1900, t->tm_hour, t->tm_min, t->tm_sec)) ;
 177 }
 178
 179
 180 size_t __cdecl wcsftime(wchar_t *, size_t, const wchar_t *, const struct tm *)
 181 {
 182     // TODO : maybe copy something from wxString::Printf
 183
 184     return 0;
 185 }