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# timeval.h

    00001 /**********************************************************************
    00002  * $Id: timeval.h 2787 2009-12-03 19:59:06Z mloskot $
    00003  *
    00004  * GEOS - Geometry Engine Open Source
    00005  * http://geos.refractions.net
    00006  *
    00007  * Copyright (C) 2006 Wu Yongwei
    00008  *
    00009  * This is free software; you can redistribute and/or modify it under
    00010  * the terms of the GNU Lesser General Public Licence as published
    00011  * by the Free Software Foundation.
    00012  * See the COPYING file for more information.
    00013  *
    00014  **********************************************************************/
    00015
    00016 #ifndef GEOS_TIMEVAL_H
    00017 #define GEOS_TIMEVAL_H
    00018
    00019 #ifndef WIN32_LEAN_AND_MEAN
    00020 #define WIN32_LEAN_AND_MEAN
    00021 #endif
    00022
    00023 #include <winsock2.h>
    00024 #include <time.h>
    00025
    00026 #if defined(_MSC_VER) || defined(__BORLANDC__)
    00027 #define EPOCHFILETIME (116444736000000000i64)
    00028 #else
    00029 #define EPOCHFILETIME (116444736000000000LL)
    00030 #endif
    00031
    00032 struct timezone {
    00033     int tz_minuteswest; /* minutes W of Greenwich */
    00034     int tz_dsttime;     /* type of dst correction */
    00035 };
    00036
    00037
    00038 #if !defined(_WIN32_WCE)
    00039
    00040 __inline int gettimeofday(struct timeval *tv, struct timezone *tz)
    00041 {
    00042     FILETIME        ft;
    00043     LARGE_INTEGER   li;
    00044     __int64         t;
    00045     static int      tzflag;
    00046
    00047     if (tv)
    00048     {
    00049         GetSystemTimeAsFileTime(&ft);
    00050         li.LowPart  = ft.dwLowDateTime;
    00051         li.HighPart = ft.dwHighDateTime;
    00052         t  = li.QuadPart;       /* In 100-nanosecond intervals */
    00053         t -= EPOCHFILETIME;     /* Offset to the Epoch time */
    00054         t /= 10;                /* In microseconds */
    00055         tv->tv_sec  = (long)(t / 1000000);
    00056         tv->tv_usec = (long)(t % 1000000);
    00057     }
    00058
    00059     if (tz)
    00060     {
    00061         if (!tzflag)
    00062         {
    00063             _tzset();
    00064             tzflag++;
    00065         }
    00066         tz->tz_minuteswest = _timezone / 60;
    00067         tz->tz_dsttime = _daylight;
    00068     }
    00069
    00070     return 0;
    00071 }
    00072
    00073 #else
    00074
    00075 __inline int gettimeofday(struct timeval *tv, struct timezone *tz)
    00076 {
    00077         SYSTEMTIME      st;
    00078     FILETIME        ft;
    00079     LARGE_INTEGER   li;
    00080     TIME_ZONE_INFORMATION tzi;
    00081     __int64         t;
    00082     static int      tzflag;
    00083
    00084     if (tv)
    00085     {
    00086                 GetSystemTime(&st);
    00087                 SystemTimeToFileTime(&st, &ft);
    00088         li.LowPart  = ft.dwLowDateTime;
    00089         li.HighPart = ft.dwHighDateTime;
    00090         t  = li.QuadPart;       /* In 100-nanosecond intervals */
    00091         t -= EPOCHFILETIME;     /* Offset to the Epoch time */
    00092         t /= 10;                /* In microseconds */
    00093         tv->tv_sec  = (long)(t / 1000000);
    00094         tv->tv_usec = (long)(t % 1000000);
    00095     }
    00096
    00097     if (tz)
    00098     {
    00099         GetTimeZoneInformation(&tzi);
    00100
    00101         tz->tz_minuteswest = tzi.Bias;
    00102                 if (tzi.StandardDate.wMonth != 0)
    00103         {
    00104                         tz->tz_minuteswest += tzi.StandardBias * 60;
    00105         }
    00106
    00107         if (tzi.DaylightDate.wMonth != 0)
    00108         {
    00109             tz->tz_dsttime = 1;
    00110         }
    00111         else
    00112         {
    00113             tz->tz_dsttime = 0;
    00114         }
    00115     }
    00116
    00117     return 0;
    00118 }
    00119
    00120 #endif /* _WIN32_WCE */
    00121
    00122 #endif /* GEOS_TIMEVAL_H */