148 lines
3.2 KiB
C
148 lines
3.2 KiB
C
/*
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* $Id$
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*/
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#include <qse/cmn/time.h>
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <sys/time.h>
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#include <time.h>
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#endif
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#if defined(QSE_USE_SYSCALL) && defined(HAVE_SYS_SYSCALL_H)
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#include <sys/syscall.h>
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#endif
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#ifdef _WIN32
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#define WIN_EPOCH_YEAR ((qse_ntime_t)1601)
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#define WIN_EPOCH_MON ((qse_ntime_t)1)
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#define WIN_EPOCH_DAY ((qse_ntime_t)1)
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#define EPOCH_DIFF_YEARS (QSE_EPOCH_YEAR-WIN_EPOCH_YEAR)
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#define EPOCH_DIFF_DAYS (EPOCH_DIFF_YEARS*365+EPOCH_DIFF_YEARS/4-3)
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#define EPOCH_DIFF_SECS (EPOCH_DIFF_DAYS*24*60*60)
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#define EPOCH_DIFF_MSECS (EPOCH_DIFF_SECS*QSE_MSEC_IN_SEC)
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#endif
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static int mdays[2][QSE_MON_IN_YEAR] =
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{
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{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
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{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
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};
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int qse_gettime (qse_ntime_t* t)
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{
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#ifdef _WIN32
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SYSTEMTIME st;
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FILETIME ft;
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/*
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* MSDN: The FILETIME structure is a 64-bit value representing the
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* number of 100-nanosecond intervals since January 1, 1601 (UTC).
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*/
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GetSystemTime (&st);
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if (SystemTimeToFileTime (&st, &ft) == FALSE) return -1;
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*t = ((qse_ntime_t)(*((qse_int64_t*)&ft)) / (10 * 1000));
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*t -= EPOCH_DIFF_MSECS;
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return 0;
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#else
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struct timeval tv;
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int n;
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#ifdef SYS_gettimeofday
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n = syscall (SYS_gettimeofday, &tv, QSE_NULL);
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#else
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n = gettimeofday (&tv, QSE_NULL);
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#endif
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if (n == -1) return -1;
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*t = tv.tv_sec * QSE_MSEC_IN_SEC + tv.tv_usec / QSE_USEC_IN_MSEC;
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return 0;
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#endif
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}
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int qse_settime (qse_ntime_t t)
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{
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#ifdef _WIN32
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FILETIME ft;
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SYSTEMTIME st;
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*((qse_int64_t*)&ft) = ((t + EPOCH_DIFF_MSECS) * (10 * 1000));
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if (FileTimeToSystemTime (&ft, &st) == FALSE) return -1;
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if (SetSystemTime(&st) == FALSE) return -1;
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return 0;
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#else
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struct timeval tv;
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int n;
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tv.tv_sec = t / QSE_MSEC_IN_SEC;
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tv.tv_usec = (t % QSE_MSEC_IN_SEC) * QSE_USEC_IN_MSEC;
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/*
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#if defined CLOCK_REALTIME && HAVE_CLOCK_SETTIME
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{
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int r = clock_settime (CLOCK_REALTIME, ts);
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if (r == 0 || errno == EPERM)
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return r;
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}
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#elif HAVE_STIME
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/ * This fails to compile on OSF1 V5.1, due to stime requiring
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a `long int*' and tv_sec is `int'. But that system does provide
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settimeofday. * /
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return stime (&ts->tv_sec);
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#else
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*/
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#ifdef SYS_settimeofday
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n = syscall (SYS_settimeofday, &tv, QSE_NULL);
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#else
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n = settimeofday (&tv, QSE_NULL);
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#endif
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if (n == -1) return -1;
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return 0;
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#endif
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}
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void qse_gmtime (qse_ntime_t nt, qse_btime_t* bt)
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{
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/* code based on minix 2.0 src/lib/ansi/gmtime.c */
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qse_ntime_t days; /* total days */
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qse_ntime_t secs; /* number of seconds in the fractional days */
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qse_ntime_t time; /* total seconds */
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int year = QSE_EPOCH_YEAR;
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time = nt / QSE_MSEC_IN_SEC;
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days = (unsigned long)time / QSE_SEC_IN_DAY;
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secs = (unsigned long)time % QSE_SEC_IN_DAY;
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bt->sec = secs % QSE_SEC_IN_MIN;
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bt->min = (secs % QSE_SEC_IN_HOUR) / QSE_SEC_IN_MIN;
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bt->hour = secs / QSE_SEC_IN_HOUR;
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bt->wday = (days + 4) % QSE_DAY_IN_WEEK;
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while (days >= QSE_DAY_IN_YEAR(year))
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{
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days -= QSE_DAY_IN_YEAR(year);
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year++;
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}
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bt->year = year - 1900;
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bt->yday = days;
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bt->mon = 0;
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while (days >= mdays[QSE_IS_LEAPYEAR(year)][bt->mon])
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{
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days -= mdays[QSE_IS_LEAPYEAR(year)][bt->mon];
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bt->mon++;
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}
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bt->mday = days + 1;
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bt->isdst = 0;
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}
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