projects / wxWidgets.git / blame
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|---|---|---|
| 59068d79 VZ |
1 | /////////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: src/common/time.cpp | |
| 3 | // Purpose: Implementation of time-related functions. | |
| 4 | // Author: Vadim Zeitlin | |
| 5 | // Created: 2011-11-26 | |
| 6 | // RCS-ID: $Id: wxhead.cpp,v 1.11 2010-04-22 12:44:51 zeitlin Exp $ | |
| 7 | // Copyright: (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org> | |
| 8 | // Licence: wxWindows licence | |
| 9 | /////////////////////////////////////////////////////////////////////////////// | |
| 10 | ||
| 11 | // ============================================================================ | |
| 12 | // declarations | |
| 13 | // ============================================================================ | |
| 14 | ||
| 15 | // ---------------------------------------------------------------------------- | |
| 16 | // headers | |
| 17 | // ---------------------------------------------------------------------------- | |
| 18 | ||
| 19 | // for compilers that support precompilation, includes "wx.h". | |
| 20 | #include "wx/wxprec.h" | |
| 21 | ||
| 22 | #ifdef __BORLANDC__ | |
| 23 | #pragma hdrstop | |
| 24 | #endif | |
| 25 | ||
| 26 | #include "wx/time.h" | |
| 27 | ||
| 28 | #ifndef WX_GMTOFF_IN_TM | |
| 29 | // Define it for some systems which don't (always) use configure but are | |
| 30 | // known to have tm_gmtoff field. | |
| 31 | #if defined(__WXPALMOS__) || defined(__DARWIN__) | |
| 32 | #define WX_GMTOFF_IN_TM | |
| 33 | #endif | |
| 34 | #endif | |
| 35 | ||
| 36 | // ============================================================================ | |
| 37 | // implementation | |
| 38 | // ============================================================================ | |
| 39 | ||
| 40 | // returns the time zone in the C sense, i.e. the difference UTC - local | |
| 41 | // (in seconds) | |
| 42 | int wxGetTimeZone() | |
| 43 | { | |
| 44 | #ifdef WX_GMTOFF_IN_TM | |
| 45 | // set to true when the timezone is set | |
| 46 | static bool s_timezoneSet = false; | |
| 47 | static long gmtoffset = LONG_MAX; // invalid timezone | |
| 48 | ||
| 49 | // ensure that the timezone variable is set by calling wxLocaltime_r | |
| 50 | if ( !s_timezoneSet ) | |
| 51 | { | |
| 52 | // just call wxLocaltime_r() instead of figuring out whether this | |
| 53 | // system supports tzset(), _tzset() or something else | |
| 54 | time_t t = time(NULL); | |
| 55 | struct tm tm; | |
| 56 | ||
| 57 | wxLocaltime_r(&t, &tm); | |
| 58 | s_timezoneSet = true; | |
| 59 | ||
| 60 | // note that GMT offset is the opposite of time zone and so to return | |
| 61 | // consistent results in both WX_GMTOFF_IN_TM and !WX_GMTOFF_IN_TM | |
| 62 | // cases we have to negate it | |
| 63 | gmtoffset = -tm.tm_gmtoff; | |
| 64 | ||
| 65 | // this function is supposed to return the same value whether DST is | |
| 66 | // enabled or not, so we need to use an additional offset if DST is on | |
| 67 | // as tm_gmtoff already does include it | |
| 68 | if ( tm.tm_isdst ) | |
| 69 | gmtoffset += 3600; | |
| 70 | } | |
| 71 | return (int)gmtoffset; | |
| 72 | #elif defined(__DJGPP__) || defined(__WINE__) | |
| 73 | struct timeb tb; | |
| 74 | ftime(&tb); | |
| 75 | return tb.timezone*60; | |
| 76 | #elif defined(__VISUALC__) | |
| 77 | // We must initialize the time zone information before using it (this will | |
| 78 | // be done only once internally). | |
| 79 | _tzset(); | |
| 80 | ||
| 81 | // Starting with VC++ 8 timezone variable is deprecated and is not even | |
| 82 | // available in some standard library version so use the new function for | |
| 83 | // accessing it instead. | |
| 84 | #if wxCHECK_VISUALC_VERSION(8) | |
| 85 | long t; | |
| 86 | _get_timezone(&t); | |
| 87 | return t; | |
| 88 | #else // VC++ < 8 | |
| 89 | return timezone; | |
| 90 | #endif | |
| 91 | #elif defined(WX_TIMEZONE) // If WX_TIMEZONE was defined by configure, use it. | |
| 92 | return WX_TIMEZONE; | |
| 93 | #elif defined(__BORLANDC__) || defined(__MINGW32__) || defined(__VISAGECPP__) | |
| 94 | return _timezone; | |
| 95 | #elif defined(__MWERKS__) | |
| 96 | return 28800; | |
| 97 | #else // unknown platform -- assume it has timezone | |
| 98 | return timezone; | |
| 99 | #endif // WX_GMTOFF_IN_TM/!WX_GMTOFF_IN_TM | |
| 100 | } |