diff options
Diffstat (limited to 'src/libs/xpcom18a4/nsprpub/pr/src/md/mac/mactime.c')
-rw-r--r-- | src/libs/xpcom18a4/nsprpub/pr/src/md/mac/mactime.c | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/nsprpub/pr/src/md/mac/mactime.c b/src/libs/xpcom18a4/nsprpub/pr/src/md/mac/mactime.c new file mode 100644 index 00000000..1e7d2a22 --- /dev/null +++ b/src/libs/xpcom18a4/nsprpub/pr/src/md/mac/mactime.c @@ -0,0 +1,253 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is the Netscape Portable Runtime (NSPR). + * + * The Initial Developer of the Original Code is + * Netscape Communications Corporation. + * Portions created by the Initial Developer are Copyright (C) 1998-2000 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * + * Alternatively, the contents of this file may be used under the terms of + * either the GNU General Public License Version 2 or later (the "GPL"), or + * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +#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); +} + + |