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boinc/zip/unzip/macos/source/mactime.c

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/*
Copyright (c) 1990-2000 Info-ZIP. All rights reserved.
See the accompanying file LICENSE, version 2000-Apr-09 or later
(the contents of which are also included in zip.h) for terms of use.
If, for some reason, all these files are missing, the Info-ZIP license
also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html
*/
/* -----------------------------------------------------------------------------
The original functions (Metrowerks Codewarrior pro 3.0) gmtime, localtime,
mktime and time do not work correctly. The supplied link library mactime.c
contains replacement functions for them.
* 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.
------------------------------------------------------------------------------*/
/*****************************************************************************/
/* Includes */
/*****************************************************************************/
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <OSUtils.h>
#include "mactime.h"
/*
The MacOS function GetDateTime returns the
number of seconds elapsed since midnight, January 1, 1904.
*/
const unsigned long MacOS_2_Unix = 2082844800L;
/*****************************************************************************/
/* Macros, typedefs */
/*****************************************************************************/
#ifndef TEST_TIME_LIB
#define my_gmtime gmtime
#define my_localtime localtime
#define my_mktime mktime
#define my_time time
#endif
/*****************************************************************************/
/* Prototypes */
/*****************************************************************************/
/* internal prototypes */
static void clear_tm(struct tm * tm);
static long GMTDelta(void);
static Boolean DaylightSaving(void);
static time_t GetTimeMac(void);
static time_t Mactime(time_t *timer);
static void normalize(int *i,int *j,int norm);
static struct tm *time2tm(const time_t *timer);
static time_t tm2time(struct tm *tp);
/* Because serial port and SLIP conflict with ReadXPram calls,
we cache the call here so we don't hang on calling ReadLocation() */
static void myReadLocation(MachineLocation * loc);
/* prototypes for STD lib replacement functions */
struct tm *my_gmtime(const time_t *t);
struct tm *my_localtime(const time_t *t);
time_t my_mktime(struct tm *tp);
time_t my_time(time_t *t);
/*****************************************************************************/
/* Functions */
/*****************************************************************************/
/*
* Mac file times are based on 1904 Jan 1 00:00 local time,
* not 1970 Jan 1 00:00 UTC.
* So we have to convert the time stamps into UNIX UTC
* compatible values.
*/
time_t MacFtime2UnixFtime(unsigned long macftime)
{
long UTCoffset;
GetGMToffsetMac(macftime, &UTCoffset);
MACOS_TO_UNIX(macftime);
macftime -= UTCoffset;
return macftime;
}
/*
* Mac file times are based on 1904 Jan 1 00:00 local time,
* not 1970 Jan 1 00:00 UTC.
* So we have to convert the time stamps into MacOS local
* compatible values.
*/
unsigned long UnixFtime2MacFtime(time_t unxftime)
{
long UTCoffset;
unsigned long macftime = unxftime;
UNIX_TO_MACOS(macftime);
GetGMToffsetMac(macftime, &UTCoffset);
macftime += UTCoffset;
return macftime;
}
/*
* This function convert a file-localtime to an another
* file-localtime.
*/
time_t AdjustForTZmoveMac(unsigned long macloctim, long s_gmtoffs)
{
time_t MacGMTTime;
long UTCoffset;
/* convert macloctim into corresponding UTC value */
MacGMTTime = macloctim - s_gmtoffs;
GetGMToffsetMac(macloctim, &UTCoffset);
return (MacGMTTime + UTCoffset);
} /* AdjustForTZmove() */
/*
* This function calculates the difference between the supplied Mac
* ftime value (local time) and the corresponding UTC time in seconds.
*/
Boolean GetGMToffsetMac(unsigned long mactime, long *UTCoffset)
{
mactime = mactime;
/*
* 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.
May be later I can include a support of GMT offset calculation for the
time in question here.
*/
*UTCoffset = GMTDelta();
return true;
}
/*****************************************************************************
* Standard Library Replacement Functions
* gmtime(), mktime(), localtime(), time()
*
* The unix epoch is used here.
* These functions gmtime(), mktime(), localtime() and time()
* expects and returns unix times.
*
* At midnight Jan. 1, 1970 GMT, the local time was
* midnight Jan. 1, 1970 + GMTDelta().
*
*
*****************************************************************************/
struct tm *my_gmtime(const time_t *timer)
{
return time2tm(timer);
}
struct tm *my_localtime(const time_t *timer)
{
time_t maclocal;
maclocal = *timer;
maclocal += GMTDelta();
return time2tm(&maclocal);
}
time_t my_mktime(struct tm *tp)
{
time_t maclocal;
maclocal = tm2time(tp);
maclocal -= GMTDelta();
return maclocal;
}
time_t my_time(time_t *time)
{
time_t tmp_time;
GetDateTime(&tmp_time);
MACOS_TO_UNIX(tmp_time);
if (time)
{
*time = tmp_time;
}
return tmp_time;
}
/*****************************************************************************/
/* static module level functions
/*****************************************************************************/
/*
* 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, but
* this function resets itself every 2 hours.
*/
static void myReadLocation(MachineLocation * loc)
{
static MachineLocation storedLoc; /* InsideMac, OSUtilities, page 4-20 */
static time_t first_call = 0, last_call = 86400;
if ((last_call - first_call) > 7200)
{
GetDateTime(&first_call);
ReadLocation(&storedLoc);
}
GetDateTime(&last_call);
*loc = storedLoc;
}
static Boolean DaylightSaving(void)
{
MachineLocation loc;
unsigned char dlsDelta;
myReadLocation(&loc);
dlsDelta = loc.u.dlsDelta;
return (dlsDelta != 0);
}
/* current local time = GMTDelta() + GMT
GMT = local time - GMTDelta() */
static long GMTDelta(void)
{
MachineLocation loc;
long gmtDelta;
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.
*/
gmtDelta = loc.u.gmtDelta & 0x00FFFFFF;
if ((gmtDelta & 0x00800000) != 0)
{
gmtDelta |= 0xFF000000;
}
return gmtDelta;
}
/* This routine simulates stdclib time(), time in seconds since 1.1.1970
The time is in GMT */
static time_t GetTimeMac(void)
{
unsigned long maclocal;
/*
* 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(&maclocal); /* Get Mac local time */
maclocal -= GMTDelta(); /* Get Mac GMT */
MACOS_TO_UNIX(maclocal);
return maclocal; /* return unix GMT */
}
/*
* clear_tm - sets a broken-down time to the equivalent of 1970/1/1 00:00:00
*/
static void clear_tm(struct tm * tm)
{
tm->tm_sec = 0;
tm->tm_min = 0;
tm->tm_hour = 0;
tm->tm_mday = 1;
tm->tm_mon = 0;
tm->tm_year = 0;
tm->tm_wday = 1;
tm->tm_yday = 0;
tm->tm_isdst = -1;
}
static void normalize(int *i,int *j,int norm)
{
while(*i < 0)
{
*i += norm;
(*j)--;
}
while(*i >= norm)
{
*i -= norm;
(*j)++;
}
}
/* Returns the GMT times */
static time_t Mactime(time_t *timer)
{
time_t t = GetTimeMac();
if (timer != NULL)
*timer = t;
return t;
}
static struct tm *time2tm(const time_t *timer)
{
DateTimeRec dtr;
MachineLocation loc;
time_t macLocal = *timer;
static struct tm statictime;
static const short monthday[12] =
{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
UNIX_TO_MACOS(macLocal);
SecondsToDate(macLocal, &dtr);
statictime.tm_sec = dtr.second; /* second, from 0 to 59 */
statictime.tm_min = dtr.minute; /* minute, from 0 to 59 */
statictime.tm_hour = dtr.hour; /* hour, from 0 to 23 */
statictime.tm_mday = dtr.day; /* day of the month, from 1 to 31 */
statictime.tm_mon = dtr.month - 1; /* month, 1= January and 12 = December */
statictime.tm_year = dtr.year - 1900; /* year, ranging from 1904 to 2040 */
statictime.tm_wday = dtr.dayOfWeek - 1; /* day of the week, 1 = Sun, 7 = Sat */
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 = DaylightSaving();
return(&statictime);
}
static time_t tm2time(struct tm *tp)
{
time_t intMacTime;
DateTimeRec dtr;
normalize(&tp->tm_sec, &tp->tm_min, 60);
normalize(&tp->tm_min, &tp->tm_hour,60);
normalize(&tp->tm_hour,&tp->tm_mday,24);
normalize(&tp->tm_mon, &tp->tm_year,12);
dtr.year = tp->tm_year + 1900; /* years since 1900 */
dtr.month = tp->tm_mon + 1; /* month, 0 = January and 11 = December */
dtr.day = tp->tm_mday; /* day of the month, from 1 to 31 */
dtr.hour = tp->tm_hour; /* hour, from 0 to 23 */
dtr.minute = tp->tm_min; /* minute, from 0 to 59 */
dtr.second = tp->tm_sec; /* second, from 0 to 59 */
DateToSeconds(&dtr, &intMacTime);
MACOS_TO_UNIX(intMacTime);
return intMacTime;
}
const char *BOINC_RCSID_d08b93ae6f = "$Id: mactime.c 4979 2005-01-02 18:29:53Z ballen $";
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