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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include <OSUtils.h>
#include <Timer.h>
#include "primpl.h"
#include "mactime.h"
unsigned long gJanuaryFirst1970Seconds;
/*
* The geographic location and time zone information of a Mac
* are stored in extended parameter RAM. The ReadLocation
* produdure uses the geographic location record, MachineLocation,
* to read the geographic location and time zone information in
* extended parameter RAM.
*
* Because serial port and SLIP conflict with ReadXPram calls,
* we cache the call here.
*
* Caveat: this caching will give the wrong result if a session
* extend across the DST changeover time.
*/
static void MyReadLocation(MachineLocation *loc)
{
static MachineLocation storedLoc;
static Boolean didReadLocation = false;
if (!didReadLocation) {
ReadLocation(&storedLoc);
didReadLocation = true;
}
*loc = storedLoc;
}
static long GMTDelta(void)
{
MachineLocation loc;
long gmtDelta;
MyReadLocation(&loc);
gmtDelta = loc.u.gmtDelta & 0x00ffffff;
if (gmtDelta & 0x00800000) { /* test sign extend bit */
gmtDelta |= 0xff000000;
}
return gmtDelta;
}
void MacintoshInitializeTime(void)
{
/*
* The NSPR epoch is midnight, Jan. 1, 1970 GMT.
*
* At midnight Jan. 1, 1970 GMT, the local time was
* midnight Jan. 1, 1970 + GMTDelta().
*
* Midnight Jan. 1, 1970 is 86400 * (365 * (1970 - 1904) + 17)
* = 2082844800 seconds since the Mac epoch.
* (There were 17 leap years from 1904 to 1970.)
*
* So the NSPR epoch is 2082844800 + GMTDelta() seconds since
* the Mac epoch. Whew! :-)
*/
gJanuaryFirst1970Seconds = 2082844800 + GMTDelta();
}
/*
*-----------------------------------------------------------------------
*
* PR_Now --
*
* Returns the current time in microseconds since the epoch.
* The epoch is midnight January 1, 1970 GMT.
* The implementation is machine dependent. This is the Mac
* Implementation.
* Cf. time_t time(time_t *tp)
*
*-----------------------------------------------------------------------
*/
PRTime PR_Now(void)
{
unsigned long currentTime; /* unsigned 32-bit integer, ranging
from midnight Jan. 1, 1904 to
6:28:15 AM Feb. 6, 2040 */
PRTime retVal;
int64 usecPerSec;
/*
* Get the current time expressed as the number of seconds
* elapsed since the Mac epoch, midnight, Jan. 1, 1904 (local time).
* On a Mac, current time accuracy is up to a second.
*/
GetDateTime(¤tTime);
/*
* Express the current time relative to the NSPR epoch,
* midnight, Jan. 1, 1970 GMT.
*
* At midnight Jan. 1, 1970 GMT, the local time was
* midnight Jan. 1, 1970 + GMTDelta().
*
* Midnight Jan. 1, 1970 is 86400 * (365 * (1970 - 1904) + 17)
* = 2082844800 seconds since the Mac epoch.
* (There were 17 leap years from 1904 to 1970.)
*
* So the NSPR epoch is 2082844800 + GMTDelta() seconds since
* the Mac epoch. Whew! :-)
*/
currentTime = currentTime - 2082844800 - GMTDelta();
/* Convert seconds to microseconds */
LL_I2L(usecPerSec, PR_USEC_PER_SEC);
LL_I2L(retVal, currentTime);
LL_MUL(retVal, retVal, usecPerSec);
return retVal;
}
/*
*-------------------------------------------------------------------------
*
* PR_LocalTimeParameters --
*
* returns the time parameters for the local time zone
*
* This is the machine-dependent implementation for Mac.
*
* Caveat: On a Mac, we only know the GMT and DST offsets for
* the current time, not for the time in question.
* Mac has no support for DST handling.
* DST changeover is all manually set by the user.
*
*-------------------------------------------------------------------------
*/
PRTimeParameters PR_LocalTimeParameters(const PRExplodedTime *gmt)
{
#pragma unused (gmt)
PRTimeParameters retVal;
MachineLocation loc;
MyReadLocation(&loc);
/*
* On a Mac, the GMT value is in seconds east of GMT. For example,
* San Francisco is at -28,800 seconds (8 hours * 3600 seconds per hour)
* east of GMT. The gmtDelta field is a 3-byte value contained in a
* long word, so you must take care to get it properly.
*/
retVal.tp_gmt_offset = loc.u.gmtDelta & 0x00ffffff;
if (retVal.tp_gmt_offset & 0x00800000) { /* test sign extend bit */
retVal.tp_gmt_offset |= 0xff000000;
}
/*
* The daylight saving time value, dlsDelta, is a signed byte
* value representing the offset for the hour field -- whether
* to add 1 hour, subtract 1 hour, or make no change at all.
*/
if (loc.u.dlsDelta) {
retVal.tp_gmt_offset -= 3600;
retVal.tp_dst_offset = 3600;
} else {
retVal.tp_dst_offset = 0;
}
return retVal;
}
PRIntervalTime _MD_GetInterval(void)
{
PRIntervalTime retVal;
PRUint64 upTime, microtomilli;
/*
* Use the Microseconds procedure to obtain the number of
* microseconds elapsed since system startup time.
*/
Microseconds((UnsignedWide *)&upTime);
LL_I2L(microtomilli, PR_USEC_PER_MSEC);
LL_DIV(upTime, upTime, microtomilli);
LL_L2I(retVal, upTime);
return retVal;
}
struct tm *Maclocaltime(const time_t * t)
{
DateTimeRec dtr;
MachineLocation loc;
time_t macLocal = *t + gJanuaryFirst1970Seconds; /* GMT Mac */
static struct tm statictime;
static const short monthday[12] =
{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
SecondsToDate(macLocal, &dtr);
statictime.tm_sec = dtr.second;
statictime.tm_min = dtr.minute;
statictime.tm_hour = dtr.hour;
statictime.tm_mday = dtr.day;
statictime.tm_mon = dtr.month - 1;
statictime.tm_year = dtr.year - 1900;
statictime.tm_wday = dtr.dayOfWeek - 1;
statictime.tm_yday = monthday[statictime.tm_mon]
+ statictime.tm_mday - 1;
if (2 < statictime.tm_mon && !(statictime.tm_year & 3))
++statictime.tm_yday;
MyReadLocation(&loc);
statictime.tm_isdst = loc.u.dlsDelta;
return(&statictime);
}
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