prmjtime.c

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#endif /* XP_UNIX */
#ifdef XP_MAC
    JSUint64 upTime;
    JSInt64	 localTime;
    JSInt64       gmtOffset;
    JSInt64    dstOffset;
    JSInt32       gmtDiff;
    JSInt64	 s2us;
#endif /* XP_MAC */

#ifdef XP_OS2
    ftime(&b);
    JSLL_UI2L(ms2us, PRMJ_USEC_PER_MSEC);
    JSLL_UI2L(s2us, PRMJ_USEC_PER_SEC);
    JSLL_UI2L(s, b.time);
    JSLL_UI2L(us, b.millitm);
    JSLL_MUL(us, us, ms2us);
    JSLL_MUL(s, s, s2us);
    JSLL_ADD(s, s, us);
    return s;
#endif
#ifdef XP_WIN
    /* The windows epoch is around 1600. The unix epoch is around 1970.
       win2un is the difference (in windows time units which are 10 times
       more precise than the JS time unit) */
    GetSystemTimeAsFileTime(&time);
    /* Win9x gets confused at midnight
       http://support.microsoft.com/default.aspx?scid=KB;en-us;q224423
       So if the low part (precision <8mins) is 0 then we get the time
       again. */
    if (!time.dwLowDateTime) {
        GetSystemTimeAsFileTime(&midnight);
        time.dwHighDateTime = midnight.dwHighDateTime;
    }
    JSLL_UI2L(s, time.dwHighDateTime);
    JSLL_UI2L(us, time.dwLowDateTime);
    JSLL_SHL(s, s, 32);
    JSLL_ADD(s, s, us);
    JSLL_SUB(s, s, win2un);
    JSLL_DIV(s, s, ten);
    return s;
#endif

#if defined(XP_UNIX) || defined(XP_BEOS)
#ifdef _SVID_GETTOD   /* Defined only on Solaris, see Solaris <sys/types.h> */
    gettimeofday(&tv);
#else
    gettimeofday(&tv, 0);
#endif /* _SVID_GETTOD */
    JSLL_UI2L(s2us, PRMJ_USEC_PER_SEC);
    JSLL_UI2L(s, tv.tv_sec);
    JSLL_UI2L(us, tv.tv_usec);
    JSLL_MUL(s, s, s2us);
    JSLL_ADD(s, s, us);
    return s;
#endif /* XP_UNIX */
#ifdef XP_MAC
    JSLL_UI2L(localTime,0);
    gmtDiff = PRMJ_LocalGMTDifference();
    JSLL_I2L(gmtOffset,gmtDiff);
    JSLL_UI2L(s2us, PRMJ_USEC_PER_SEC);
    JSLL_MUL(gmtOffset,gmtOffset,s2us);

    /* don't adjust for DST since it sets ctime and gmtime off on the MAC */
    Microseconds((UnsignedWide*)&upTime);
    JSLL_ADD(localTime,localTime,gmtOffset);
    JSLL_ADD(localTime,localTime, dstLocalBaseMicroseconds);
    JSLL_ADD(localTime,localTime, upTime);

    dstOffset = PRMJ_DSTOffset(localTime);
    JSLL_SUB(localTime,localTime,dstOffset);

    return *((JSUint64 *)&localTime);
#endif /* XP_MAC */
}

/* Get the DST timezone offset for the time passed in */
JSInt64
PRMJ_DSTOffset(JSInt64 local_time)
{
    JSInt64 us2s;
#ifdef XP_MAC
    /*
     * Convert the local time passed in to Macintosh epoch seconds. Use UTC utilities to convert
     * to UTC time, then compare difference with our GMT offset. If they are the same, then
     * DST must not be in effect for the input date/time.
     */
    UInt32 macLocalSeconds = (local_time / PRMJ_USEC_PER_SEC) + gJanuaryFirst1970Seconds, utcSeconds;
    ConvertLocalTimeToUTC(macLocalSeconds, &utcSeconds);
    if ((utcSeconds - macLocalSeconds) == PRMJ_LocalGMTDifference())
        return 0;
    else {
        JSInt64 dlsOffset;
    	JSLL_UI2L(us2s, PRMJ_USEC_PER_SEC);
    	JSLL_UI2L(dlsOffset, PRMJ_HOUR_SECONDS);
    	JSLL_MUL(dlsOffset, dlsOffset, us2s);
        return dlsOffset;
    }
#else
    time_t local;
    JSInt32 diff;
    JSInt64  maxtimet;
    struct tm tm;
    PRMJTime prtm;
#ifndef HAVE_LOCALTIME_R
    struct tm *ptm;
#endif


    JSLL_UI2L(us2s, PRMJ_USEC_PER_SEC);
    JSLL_DIV(local_time, local_time, us2s);

    /* get the maximum of time_t value */
    JSLL_UI2L(maxtimet,PRMJ_MAX_UNIX_TIMET);

    if(JSLL_CMP(local_time,>,maxtimet)){
        JSLL_UI2L(local_time,PRMJ_MAX_UNIX_TIMET);
    } else if(!JSLL_GE_ZERO(local_time)){
        /*go ahead a day to make localtime work (does not work with 0) */
        JSLL_UI2L(local_time,PRMJ_DAY_SECONDS);
    }
    JSLL_L2UI(local,local_time);
    PRMJ_basetime(local_time,&prtm);
#ifndef HAVE_LOCALTIME_R
    ptm = localtime(&local);
    if(!ptm){
        return JSLL_ZERO;
    }
    tm = *ptm;
#else
    localtime_r(&local,&tm); /* get dst information */
#endif

    diff = ((tm.tm_hour - prtm.tm_hour) * PRMJ_HOUR_SECONDS) +
	((tm.tm_min - prtm.tm_min) * 60);

    if(diff < 0){
	diff += PRMJ_DAY_SECONDS;
    }

    JSLL_UI2L(local_time,diff);

    JSLL_MUL(local_time,local_time,us2s);

    return(local_time);
#endif
}

/* Format a time value into a buffer. Same semantics as strftime() */
size_t
PRMJ_FormatTime(char *buf, int buflen, char *fmt, PRMJTime *prtm)
{
#if defined(XP_UNIX) || defined(XP_WIN) || defined(XP_OS2) || defined(XP_MAC) || defined(XP_BEOS)
    struct tm a;

    /* Zero out the tm struct.  Linux, SunOS 4 struct tm has extra members int
     * tm_gmtoff, char *tm_zone; when tm_zone is garbage, strftime gets
     * confused and dumps core.  NSPR20 prtime.c attempts to fill these in by
     * calling mktime on the partially filled struct, but this doesn't seem to
     * work as well; the result string has "can't get timezone" for ECMA-valid
     * years.  Might still make sense to use this, but find the range of years
     * for which valid tz information exists, and map (per ECMA hint) from the
     * given year into that range.
     
     * N.B. This hasn't been tested with anything that actually _uses_
     * tm_gmtoff; zero might be the wrong thing to set it to if you really need
     * to format a time.  This fix is for jsdate.c, which only uses
     * JS_FormatTime to get a string representing the time zone.  */
    memset(&a, 0, sizeof(struct tm));

    a.tm_sec = prtm->tm_sec;
    a.tm_min = prtm->tm_min;
    a.tm_hour = prtm->tm_hour;
    a.tm_mday = prtm->tm_mday;
    a.tm_mon = prtm->tm_mon;
    a.tm_wday = prtm->tm_wday;
    a.tm_year = prtm->tm_year - 1900;
    a.tm_yday = prtm->tm_yday;
    a.tm_isdst = prtm->tm_isdst;

    /* Even with the above, SunOS 4 seems to detonate if tm_zone and tm_gmtoff
     * are null.  This doesn't quite work, though - the timezone is off by
     * tzoff + dst.  (And mktime seems to return -1 for the exact dst
     * changeover time.)

     */

#if defined(SUNOS4)
    if (mktime(&a) == -1) {
        /* Seems to fail whenever the requested date is outside of the 32-bit
         * UNIX epoch.  We could proceed at this point (setting a.tm_zone to
         * "") but then strftime returns a string with a 2-digit field of
         * garbage for the year.  So we return 0 and hope jsdate.c
         * will fall back on toString.
         */
        return 0;
    }
#endif

    return strftime(buf, buflen, fmt, &a);
#endif
}

/* table for number of days in a month */
static int mtab[] = {
    /* jan, feb,mar,apr,may,jun */
    31,28,31,30,31,30,
    /* july,aug,sep,oct,nov,dec */
    31,31,30,31,30,31
};

/*
 * basic time calculation functionality for localtime and gmtime
 * setups up prtm argument with correct values based upon input number
 * of seconds.
 */
static void
PRMJ_basetime(JSInt64 tsecs, PRMJTime *prtm)
{
    /* convert tsecs back to year,month,day,hour,secs */
    JSInt32 year    = 0;
    JSInt32 month   = 0;
    JSInt32 yday    = 0;
    JSInt32 mday    = 0;
    JSInt32 wday    = 6; /* start on a Sunday */
    JSInt32 days    = 0;
    JSInt32 seconds = 0;
    JSInt32 minutes = 0;
    JSInt32 hours   = 0;
    JSInt32 isleap  = 0;
    JSInt64 result;
    JSInt64	result1;
    JSInt64	result2;
    JSInt64 base;

    JSLL_UI2L(result,0);
    JSLL_UI2L(result1,0);
    JSLL_UI2L(result2,0);

    /* get the base time via UTC */
    base = PRMJ_ToExtendedTime(0);
    JSLL_UI2L(result,  PRMJ_USEC_PER_SEC);
    JSLL_DIV(base,base,result);
    JSLL_ADD(tsecs,tsecs,base);

    JSLL_UI2L(result, PRMJ_YEAR_SECONDS);
    JSLL_UI2L(result1,PRMJ_DAY_SECONDS);
    JSLL_ADD(result2,result,result1);

    /* get the year */
    while ((isleap == 0) ? !JSLL_CMP(tsecs,<,result) : !JSLL_CMP(tsecs,<,result2)) {
        /* subtract a year from tsecs */
        JSLL_SUB(tsecs,tsecs,result);
        days += 365;
        /* is it a leap year ? */
        if(IS_LEAP(year)){
            JSLL_SUB(tsecs,tsecs,result1);
            days++;
        }
        year++;
        isleap = IS_LEAP(year);
    }

    JSLL_UI2L(result1,PRMJ_DAY_SECONDS);

    JSLL_DIV(result,tsecs,result1);
    JSLL_L2I(mday,result);

    /* let's find the month */
    while(((month == 1 && isleap) ?
            (mday >= mtab[month] + 1) :
            (mday >= mtab[month]))){
	 yday += mtab[month];
	 days += mtab[month];

	 mday -= mtab[month];

         /* it's a Feb, check if this is a leap year */
	 if(month == 1 && isleap != 0){
	     yday++;
	     days++;
	     mday--;
	 }
	 month++;
    }

    /* now adjust tsecs */
    JSLL_MUL(result,result,result1);
    JSLL_SUB(tsecs,tsecs,result);

    mday++; /* day of month always start with 1 */
    days += mday;
    wday = (days + wday) % 7;

    yday += mday;

    /* get the hours */
    JSLL_UI2L(result1,PRMJ_HOUR_SECONDS);
    JSLL_DIV(result,tsecs,result1);
    JSLL_L2I(hours,result);
    JSLL_MUL(result,result,result1);
    JSLL_SUB(tsecs,tsecs,result);

    /* get minutes */
    JSLL_UI2L(result1,60);
    JSLL_DIV(result,tsecs,result1);
    JSLL_L2I(minutes,result);
    JSLL_MUL(result,result,result1);
    JSLL_SUB(tsecs,tsecs,result);

    JSLL_L2I(seconds,tsecs);

    prtm->tm_usec  = 0L;
    prtm->tm_sec   = (JSInt8)seconds;
    prtm->tm_min   = (JSInt8)minutes;
    prtm->tm_hour  = (JSInt8)hours;
    prtm->tm_mday  = (JSInt8)mday;
    prtm->tm_mon   = (JSInt8)month;
    prtm->tm_wday  = (JSInt8)wday;
    prtm->tm_year  = (JSInt16)year;
    prtm->tm_yday  = (JSInt16)yday;
}