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wine/dlls/ntdll/time.c
György 'Nog' Jeney 6f3015b8ee - Move SetSystemTime, GetTimeZoneInformation and 
SetTimeZoneInformation implementation to ntdll.
- Docu updates.
2002-11-25 01:12:39 +00:00

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/*
* Nt time functions.
*
* RtlTimeToTimeFields, RtlTimeFieldsToTime and defines are taken from ReactOS and
* adapted to wine with special permissions of the author
* Rex Jolliff (rex@lvcablemodem.com)
*
* Copyright 1999 Juergen Schmied
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <string.h>
#include <time.h>
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "winternl.h"
#include "wine/unicode.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
#define SETTIME_MAX_ADJUST 120
/* This structure is used to store strings that represent all of the time zones
* in the world. (This is used to help GetTimeZoneInformation)
*/
struct tagTZ_INFO
{
const char *psTZFromUnix;
WCHAR psTZWindows[32];
int bias;
int dst;
};
static const struct tagTZ_INFO TZ_INFO[] =
{
{"MHT",
{'D','a','t','e','l','i','n','e',' ','S','t','a','n','d','a','r','d',' ',
'T','i','m','e','\0'}, -720, 0},
{"SST",
{'S','a','m','o','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
'e','\0'}, 660, 0},
{"HST",
{'H','a','w','a','i','i','a','n',' ','S','t','a','n','d','a','r','d',' ',
'T','i','m','e','\0'}, 600, 0},
{"AKDT",
{'A','l','a','s','k','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
'i','m','e','\0'}, 480, 1},
{"PDT",
{'P','a','c','i','f','i','c',' ','S','t','a','n','d','a','r','d',' ','T',
'i','m','e','\0'}, 420, 1},
{"MST",
{'U','S',' ','M','o','u','n','t','a','i','n',' ','S','t','a','n','d','a',
'r','d',' ','T','i','m','e','\0'}, 420, 0},
{"MDT",
{'M','o','u','n','t','a','i','n',' ','S','t','a','n','d','a','r','d',' ',
'T','i','m','e','\0'}, 360, 1},
{"CST",
{'C','e','n','t','r','a','l',' ','A','m','e','r','i','c','a',' ','S','t',
'a','n','d','a','r','d',' ','T','i','m','e','\0'}, 360, 0},
{"CDT",
{'C','e','n','t','r','a','l',' ','S','t','a','n','d','a','r','d',' ','T',
'i','m','e','\0'}, 300, 1},
{"COT",
{'S','A',' ','P','a','c','i','f','i','c',' ','S','t','a','n','d','a','r',
'd',' ','T','i','m','e','\0'}, 300, 0},
{"EDT",
{'E','a','s','t','e','r','n',' ','S','t','a','n','d','a','r','d',' ','T',
'i','m','e','\0'}, 240, 1},
{"EST",
{'U','S',' ','E','a','s','t','e','r','n',' ','S','t','a','n','d','a','r',
'd',' ','T','i','m','e','\0'}, 300, 0},
{"ADT",
{'A','t','l','a','n','t','i','c',' ','S','t','a','n','d','a','r','d',' ',
'T','i','m','e','\0'}, 180, 1},
{"VET",
{'S','A',' ','W','e','s','t','e','r','n',' ','S','t','a','n','d','a','r',
'd',' ','T','i','m','e','\0'}, 240, 0},
{"CLT",
{'P','a','c','i','f','i','c',' ','S','A',' ','S','t','a','n','d','a','r',
'd',' ','T','i','m','e','\0'}, 240, 0},
{"NDT",
{'N','e','w','f','o','u','n','d','l','a','n','d',' ','S','t','a','n','d',
'a','r','d',' ','T','i','m','e','\0'}, 150, 1},
{"BRT",
{'E','.',' ','S','o','u','t','h',' ','A','m','e','r','i','c','a',' ','S',
't','a','n','d','a','r','d',' ','T','i','m','e','\0'}, 180, 0},
{"ART",
{'S','A',' ','E','a','s','t','e','r','n',' ','S','t','a','n','d','a','r',
'd',' ','T','i','m','e','\0'}, 180, 0},
{"WGST",
{'G','r','e','e','n','l','a','n','d',' ','S','t','a','n','d','a','r','d',
' ','T','i','m','e','\0'}, 120, 1},
{"GST",
{'M','i','d','-','A','t','l','a','n','t','i','c',' ','S','t','a','n','d',
'a','r','d',' ','T','i','m','e','\0'}, 120, 0},
{"AZOST",
{'A','z','o','r','e','s',' ','S','t','a','n','d','a','r','d',' ','T','i',
'm','e','\0'}, 0, 1},
{"CVT",
{'C','a','p','e',' ','V','e','r','d','e',' ','S','t','a','n','d','a','r',
'd',' ','T','i','m','e','\0'}, 60, 0},
{"WET",
{'G','r','e','e','n','w','i','c','h',' ','S','t','a','n','d','a','r','d',
' ','T','i','m','e','\0'}, 0, 0},
{"BST",
{'G','M','T',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'},
-60, 1},
{"GMT",
{'G','M','T',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'},
0, 0},
{"CEST",
{'C','e','n','t','r','a','l',' ','E','u','r','o','p','e',' ','S','t','a',
'n','d','a','r','d',' ','T','i','m','e','\0'}, -120, 1},
{"WAT",
{'W','.',' ','C','e','n','t','r','a','l',' ','A','f','r','i','c','a',' ',
'S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'}, -60, 0},
{"EEST",
{'E','.',' ','E','u','r','o','p','e',' ','S','t','a','n','d','a','r','d',
' ','T','i','m','e','\0'}, -180, 1},
{"EET",
{'E','g','y','p','t',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
'e','\0'}, -120, 0},
{"CAT",
{'S','o','u','t','h',' ','A','f','r','i','c','a',' ','S','t','a','n','d',
'a','r','d',' ','T','i','m','e','\0'}, -120, 0},
{"IST",
{'I','s','r','a','e','l',' ','S','t','a','n','d','a','r','d',' ','T','i',
'm','e','\0'}, -120, 0},
{"ADT",
{'A','r','a','b','i','c',' ','S','t','a','n','d','a','r','d',' ','T','i',
'm','e','\0'}, -240, 1},
{"AST",
{'A','r','a','b',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
'\0'}, -180, 0},
{"MSD",
{'R','u','s','s','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
'i','m','e','\0'}, -240, 1},
{"EAT",
{'E','.',' ','A','f','r','i','c','a',' ','S','t','a','n','d','a','r','d',
' ','T','i','m','e','\0'}, -180, 0},
{"IRST",
{'I','r','a','n',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
'\0'}, -270, 1},
{"GST",
{'A','r','a','b','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
'i','m','e','\0'}, -240, 0},
{"AZST",
{'C','a','u','c','a','s','u','s',' ','S','t','a','n','d','a','r','d',' ',
'T','i','m','e','\0'}, -300, 1},
{"AFT",
{'A','f','g','h','a','n','i','s','t','a','n',' ','S','t','a','n','d','a',
'r','d',' ','T','i','m','e','\0'}, -270, 0},
{"YEKST",
{'E','k','a','t','e','r','i','n','b','u','r','g',' ','S','t','a','n','d',
'a','r','d',' ','T','i','m','e','\0'}, -360, 1},
{"PKT",
{'W','e','s','t',' ','A','s','i','a',' ','S','t','a','n','d','a','r','d',
' ','T','i','m','e','\0'}, -300, 0},
{"IST",
{'I','n','d','i','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
'e','\0'}, -330, 0},
{"NPT",
{'N','e','p','a','l',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
'e','\0'}, -345, 0},
{"ALMST",
{'N','.',' ','C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t',
'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -420, 1},
{"BDT",
{'C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t','a','n','d',
'a','r','d',' ','T','i','m','e','\0'}, -360, 0},
{"LKT",
{'S','r','i',' ','L','a','n','k','a',' ','S','t','a','n','d','a','r','d',
' ','T','i','m','e','\0'}, -360, 0},
{"MMT",
{'M','y','a','n','m','a','r',' ','S','t','a','n','d','a','r','d',' ','T',
'i','m','e','\0'}, -390, 0},
{"ICT",
{'S','E',' ','A','s','i','a',' ','S','t','a','n','d','a','r','d',' ','T',
'i','m','e','\0'}, -420, 0},
{"KRAST",
{'N','o','r','t','h',' ','A','s','i','a',' ','S','t','a','n','d','a','r',
'd',' ','T','i','m','e','\0'}, -480, 1},
{"CST",
{'C','h','i','n','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
'e','\0'}, -480, 0},
{"IRKST",
{'N','o','r','t','h',' ','A','s','i','a',' ','E','a','s','t',' ','S','t',
'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -540, 1},
{"SGT",
{'M','a','l','a','y',' ','P','e','n','i','n','s','u','l','a',' ','S','t',
'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -480, 0},
{"WST",
{'W','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
'a','r','d',' ','T','i','m','e','\0'}, -480, 0},
{"JST",
{'T','o','k','y','o',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
'e','\0'}, -540, 0},
{"KST",
{'K','o','r','e','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
'e','\0'}, -540, 0},
{"YAKST",
{'Y','a','k','u','t','s','k',' ','S','t','a','n','d','a','r','d',' ','T',
'i','m','e','\0'}, -600, 1},
{"CST",
{'C','e','n','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a',
'n','d','a','r','d',' ','T','i','m','e','\0'}, -570, 0},
{"EST",
{'E','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
'a','r','d',' ','T','i','m','e','\0'}, -600, 0},
{"GST",
{'W','e','s','t',' ','P','a','c','i','f','i','c',' ','S','t','a','n','d',
'a','r','d',' ','T','i','m','e','\0'}, -600, 0},
{"VLAST",
{'V','l','a','d','i','v','o','s','t','o','k',' ','S','t','a','n','d','a',
'r','d',' ','T','i','m','e','\0'}, -660, 1},
{"MAGST",
{'C','e','n','t','r','a','l',' ','P','a','c','i','f','i','c',' ','S','t',
'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -720, 1},
{"NZST",
{'N','e','w',' ','Z','e','a','l','a','n','d',' ','S','t','a','n','d','a',
'r','d',' ','T','i','m','e','\0'}, -720, 0},
{"FJT",
{'F','i','j','i',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
'\0'}, -720, 0},
{"TOT",
{'T','o','n','g','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
'e','\0'}, -780, 0}
};
/*********** start of code by Rex Jolliff (rex@lvcablemodem.com) **************/
#define TICKSPERSEC 10000000
#define TICKSPERMSEC 10000
#define SECSPERDAY 86400
#define SECSPERHOUR 3600
#define SECSPERMIN 60
#define MINSPERHOUR 60
#define HOURSPERDAY 24
#define EPOCHWEEKDAY 0
#define DAYSPERWEEK 7
#define EPOCHYEAR 1601
#define DAYSPERNORMALYEAR 365
#define DAYSPERLEAPYEAR 366
#define MONSPERYEAR 12
/* 1601 to 1970 is 369 years plus 89 leap days */
#define SECS_1601_TO_1970 ((369 * 365 + 89) * (ULONGLONG)86400)
/* 1601 to 1980 is 379 years plus 91 leap days */
#define SECS_1601_to_1980 ((379 * 365 + 91) * (ULONGLONG)86400)
static const int YearLengths[2] = {DAYSPERNORMALYEAR, DAYSPERLEAPYEAR};
static const int MonthLengths[2][MONSPERYEAR] =
{
{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
};
static inline int IsLeapYear(int Year)
{
return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ? 1 : 0;
}
static inline void NormalizeTimeFields(CSHORT *FieldToNormalize, CSHORT *CarryField,int Modulus)
{
*FieldToNormalize = (CSHORT) (*FieldToNormalize - Modulus);
*CarryField = (CSHORT) (*CarryField + 1);
}
/******************************************************************************
* RtlTimeToTimeFields [NTDLL.@]
*
* Parses Time into a TimeFields structure.
*
* PARAMS:
* liTime [I]: Time to convert to timefields.
* TimeFields [O]: Pointer to TIME_FIELDS structure to hold parsed info.
*
* RETURNS:
* Nothing.
*/
VOID WINAPI RtlTimeToTimeFields(
const LARGE_INTEGER *liTime,
PTIME_FIELDS TimeFields)
{
const int *Months;
int SecondsInDay, CurYear;
int LeapYear, CurMonth;
long int Days;
LONGLONG Time;
Time = liTime->s.HighPart;
Time <<= 32;
Time += liTime->s.LowPart;
/* Extract millisecond from time and convert time into seconds */
TimeFields->Milliseconds = (CSHORT) ((Time % TICKSPERSEC) / TICKSPERMSEC);
Time = Time / TICKSPERSEC;
/* The native version of RtlTimeToTimeFields does not take leap seconds
* into account */
/* Split the time into days and seconds within the day */
Days = Time / SECSPERDAY;
SecondsInDay = Time % SECSPERDAY;
/* compute time of day */
TimeFields->Hour = (CSHORT) (SecondsInDay / SECSPERHOUR);
SecondsInDay = SecondsInDay % SECSPERHOUR;
TimeFields->Minute = (CSHORT) (SecondsInDay / SECSPERMIN);
TimeFields->Second = (CSHORT) (SecondsInDay % SECSPERMIN);
/* compute day of week */
TimeFields->Weekday = (CSHORT) ((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
/* compute year */
CurYear = EPOCHYEAR;
/* FIXME: handle calendar modifications */
while (1)
{ LeapYear = IsLeapYear(CurYear);
if (Days < (long) YearLengths[LeapYear])
{ break;
}
CurYear++;
Days = Days - (long) YearLengths[LeapYear];
}
TimeFields->Year = (CSHORT) CurYear;
/* Compute month of year */
Months = MonthLengths[LeapYear];
for (CurMonth = 0; Days >= (long) Months[CurMonth]; CurMonth++)
Days = Days - (long) Months[CurMonth];
TimeFields->Month = (CSHORT) (CurMonth + 1);
TimeFields->Day = (CSHORT) (Days + 1);
}
/******************************************************************************
* RtlTimeFieldsToTime [NTDLL.@]
*
* Converts a TIME_FIELDS structure to time.
*
* PARAMS:
* ftTimeFields [I]: Time fields structure to convert.
* Time [O]: Converted time.
*
* RETURNS:
* TRUE: Successfull
* FALSE: Failure.
*/
BOOLEAN WINAPI RtlTimeFieldsToTime(
PTIME_FIELDS tfTimeFields,
PLARGE_INTEGER Time)
{
int CurYear, CurMonth;
LONGLONG rcTime;
TIME_FIELDS TimeFields = *tfTimeFields;
rcTime = 0;
/* FIXME: normalize the TIME_FIELDS structure here */
while (TimeFields.Second >= SECSPERMIN)
{ NormalizeTimeFields(&TimeFields.Second, &TimeFields.Minute, SECSPERMIN);
}
while (TimeFields.Minute >= MINSPERHOUR)
{ NormalizeTimeFields(&TimeFields.Minute, &TimeFields.Hour, MINSPERHOUR);
}
while (TimeFields.Hour >= HOURSPERDAY)
{ NormalizeTimeFields(&TimeFields.Hour, &TimeFields.Day, HOURSPERDAY);
}
while (TimeFields.Day > MonthLengths[IsLeapYear(TimeFields.Year)][TimeFields.Month - 1])
{ NormalizeTimeFields(&TimeFields.Day, &TimeFields.Month, SECSPERMIN);
}
while (TimeFields.Month > MONSPERYEAR)
{ NormalizeTimeFields(&TimeFields.Month, &TimeFields.Year, MONSPERYEAR);
}
/* FIXME: handle calendar corrections here */
for (CurYear = EPOCHYEAR; CurYear < TimeFields.Year; CurYear++)
{ rcTime += YearLengths[IsLeapYear(CurYear)];
}
for (CurMonth = 1; CurMonth < TimeFields.Month; CurMonth++)
{ rcTime += MonthLengths[IsLeapYear(CurYear)][CurMonth - 1];
}
rcTime += TimeFields.Day - 1;
rcTime *= SECSPERDAY;
rcTime += TimeFields.Hour * SECSPERHOUR + TimeFields.Minute * SECSPERMIN + TimeFields.Second;
rcTime *= TICKSPERSEC;
rcTime += TimeFields.Milliseconds * TICKSPERMSEC;
*Time = *(LARGE_INTEGER *)&rcTime;
return TRUE;
}
/************ end of code by Rex Jolliff (rex@lvcablemodem.com) ***************/
/******************************************************************************
* RtlSystemTimeToLocalTime [NTDLL.@]
*
* Converts system Time to local time.
*
* PARAMS:
* SystemTime [I]: System time to convert.
* LocalTime [O]: Local time of the supplied system time.
*
* RETURNS:
* Nothing.
*/
VOID WINAPI RtlSystemTimeToLocalTime(
IN PLARGE_INTEGER SystemTime,
OUT PLARGE_INTEGER LocalTime)
{
FIXME("(%p, %p),stub!\n",SystemTime,LocalTime);
memcpy (LocalTime, SystemTime, sizeof (PLARGE_INTEGER));
}
/******************************************************************************
* RtlTimeToSecondsSince1970 [NTDLL.@]
*
* Converts Time to seconds since 1970.
*
* PARAMS:
* time [I]: Time to convert.
* res [O]: Pointer to a LONG to recieve the seconds since 1970.
*
* RETURNS:
* TRUE: Successfull.
* FALSE: Failure.
*/
BOOLEAN WINAPI RtlTimeToSecondsSince1970( const LARGE_INTEGER *time, PULONG res )
{
ULONGLONG tmp = ((ULONGLONG)time->s.HighPart << 32) | time->s.LowPart;
tmp = RtlLargeIntegerDivide( tmp, 10000000, NULL );
tmp -= SECS_1601_TO_1970;
if (tmp > 0xffffffff) return FALSE;
*res = (DWORD)tmp;
return TRUE;
}
/******************************************************************************
* RtlTimeToSecondsSince1980 [NTDLL.@]
*
* Converts Time to seconds since 1980.
*
* PARAMS:
* time [I]: Time to convert.
* res [O]: Pointer to a integer to recieve the time since 1980.
*
* RETURNS:
* TRUE: Successfull
* FALSE: Failure.
*/
BOOLEAN WINAPI RtlTimeToSecondsSince1980( const LARGE_INTEGER *time, LPDWORD res )
{
ULONGLONG tmp = ((ULONGLONG)time->s.HighPart << 32) | time->s.LowPart;
tmp = RtlLargeIntegerDivide( tmp, 10000000, NULL );
tmp -= SECS_1601_to_1980;
if (tmp > 0xffffffff) return FALSE;
*res = (DWORD)tmp;
return TRUE;
}
/******************************************************************************
* RtlSecondsSince1970ToTime [NTDLL.@]
*
* Converts seconds since 1970 to time.
*
* PARAMS:
* time [I]: Seconds since 1970 to convert.
* res [O]: Seconds since 1970 in Time.
*
* RETURNS:
* Nothing.
*/
void WINAPI RtlSecondsSince1970ToTime( DWORD time, LARGE_INTEGER *res )
{
ULONGLONG secs = RtlExtendedIntegerMultiply( time + SECS_1601_TO_1970, 10000000 );
res->s.LowPart = (DWORD)secs;
res->s.HighPart = (DWORD)(secs >> 32);
}
/******************************************************************************
* RtlSecondsSince1980ToTime [NTDLL.@]
*
* Converts seconds since 1980 to time.
*
* PARAMS:
* time [I]: Seconds since 1980 to convert.
* res [O]: Seconds since 1980 in Time.
*
* RETURNS:
* Nothing.
*/
void WINAPI RtlSecondsSince1980ToTime( DWORD time, LARGE_INTEGER *res )
{
ULONGLONG secs = RtlExtendedIntegerMultiply( time + SECS_1601_to_1980, 10000000 );
res->s.LowPart = (DWORD)secs;
res->s.HighPart = (DWORD)(secs >> 32);
}
/******************************************************************************
* RtlTimeToElapsedTimeFields [NTDLL.@]
*
* ??
*
* PARAMS:
* liTime [?]: ??
* TimeFields [?]: ??
*
* RETURNS:
* Nothing.
*
* FIXME:
* Prototype guessed.
*/
VOID WINAPI RtlTimeToElapsedTimeFields(
PLARGE_INTEGER liTime,
PTIME_FIELDS TimeFields)
{
FIXME("(%p,%p): stub\n",liTime,TimeFields);
}
/***********************************************************************
* NtQuerySystemTime [NTDLL.@]
* ZwQuerySystemTime [NTDLL.@]
*
* Gets the current system time.
*
* PARAMS:
* time [O]: The current system time.
*
* RETURNS:
* Status.
*/
NTSTATUS WINAPI NtQuerySystemTime( PLARGE_INTEGER time )
{
ULONGLONG secs;
struct timeval now;
gettimeofday( &now, 0 );
secs = RtlExtendedIntegerMultiply( now.tv_sec+SECS_1601_TO_1970, 10000000 ) + now.tv_usec * 10;
time->s.LowPart = (DWORD)secs;
time->s.HighPart = (DWORD)(secs >> 32);
return STATUS_SUCCESS;
}
/***********************************************************************
* TIME_GetBias [internal]
*
* Helper function calculates delta local time from UTC.
*
* PARAMS:
* utc [I]: The current utc time.
* pdaylight [I]: Local daylight.
*
* RETURNS:
* The bias for the current timezone.
*/
static int TIME_GetBias(time_t utc, int *pdaylight)
{
struct tm *ptm = localtime(&utc);
*pdaylight = ptm->tm_isdst; /* daylight for local timezone */
ptm = gmtime(&utc);
ptm->tm_isdst = *pdaylight; /* use local daylight, not that of Greenwich */
return (int)(utc-mktime(ptm));
}
/***********************************************************************
* TIME_GetTZAsStr [internal]
*
* Helper function that returns the given timezone as a string.
*
* PARAMS:
* utc [I]: The current utc time.
* bias [I]: The bias of the current timezone.
* dst [I]: ??
*
* RETURNS:
* Timezone name.
*
* NOTES:
* This could be done with a hash table instead of merely iterating through a
* table, however with the small amount of entries (60 or so) I didn't think
* it was worth it.
*/
static const WCHAR* TIME_GetTZAsStr (time_t utc, int bias, int dst)
{
char psTZName[7];
struct tm *ptm = localtime(&utc);
int i;
if (!strftime (psTZName, 7, "%Z", ptm))
return (NULL);
for (i=0; i<(sizeof(TZ_INFO) / sizeof(struct tagTZ_INFO)); i++)
{
if ( strcmp(TZ_INFO[i].psTZFromUnix, psTZName) == 0 &&
TZ_INFO[i].bias == bias &&
TZ_INFO[i].dst == dst
)
return TZ_INFO[i].psTZWindows;
}
return (NULL);
}
/***********************************************************************
* RtlQueryTimeZoneInformation [NTDLL.@]
*
* Returns the timezone.
*
* PARAMS:
* tzinfo [O]: Retrieves the timezone info.
*
* RETURNS:
* Status.
*/
NTSTATUS WINAPI RtlQueryTimeZoneInformation(LPTIME_ZONE_INFORMATION tzinfo)
{
time_t gmt;
int bias, daylight;
const WCHAR *psTZ;
memset(tzinfo, 0, sizeof(TIME_ZONE_INFORMATION));
gmt = time(NULL);
bias = TIME_GetBias(gmt, &daylight);
tzinfo->Bias = -bias / 60;
tzinfo->StandardBias = 0;
tzinfo->DaylightBias = -60;
psTZ = TIME_GetTZAsStr (gmt, (-bias/60), daylight);
if (psTZ) strcpyW( tzinfo->StandardName, psTZ );
return STATUS_SUCCESS;
}
/***********************************************************************
* RtlSetTimeZoneInformation [NTDLL.@]
*
* Sets the current time zone.
*
* PARAMS:
* tzinfo [I]: Timezone information used to set timezone.
*
* RETURNS:
* Status.
*
* BUGS:
* Uses the obsolete unix timezone structure and tz_dsttime member.
*/
NTSTATUS WINAPI RtlSetTimeZoneInformation( const TIME_ZONE_INFORMATION *tzinfo )
{
struct timezone tz;
tz.tz_minuteswest = tzinfo->Bias;
#ifdef DST_NONE
tz.tz_dsttime = DST_NONE;
#else
tz.tz_dsttime = 0;
#endif
if(!settimeofday(NULL, &tz))
return STATUS_SUCCESS;
return STATUS_PRIVILEGE_NOT_HELD;
}
/***********************************************************************
* NtSetSystemTime [NTDLL.@]
* ZwSetSystemTime [NTDLL.@]
*
* Sets the system time.
*
* PARAM:
* NewTime [I]: The time to set the system time to.
* OldTime [O]: Optional (ie. can be NULL). Old Time.
*
* RETURNS:
* Status.
*/
NTSTATUS WINAPI NtSetSystemTime(const LARGE_INTEGER *NewTime, LARGE_INTEGER *OldTime)
{
TIME_FIELDS tf;
struct timeval tv;
struct timezone tz;
struct tm t;
time_t sec, oldsec;
int dst, bias;
int err;
/* Return the old time if necessary */
if(OldTime)
NtQuerySystemTime(OldTime);
RtlTimeToTimeFields(NewTime, &tf);
/* call gettimeofday to get the current timezone */
gettimeofday(&tv, &tz);
oldsec = tv.tv_sec;
/* get delta local time from utc */
bias = TIME_GetBias(oldsec, &dst);
/* get the number of seconds */
t.tm_sec = tf.Second;
t.tm_min = tf.Minute;
t.tm_hour = tf.Hour;
t.tm_mday = tf.Day;
t.tm_mon = tf.Month - 1;
t.tm_year = tf.Year - 1900;
t.tm_isdst = dst;
sec = mktime (&t);
/* correct for timezone and daylight */
sec += bias;
/* set the new time */
tv.tv_sec = sec;
tv.tv_usec = tf.Milliseconds * 1000;
/* error and sanity check*/
if(sec == (time_t)-1 || abs((int)(sec-oldsec)) > SETTIME_MAX_ADJUST) {
err = 2;
} else {
#ifdef HAVE_SETTIMEOFDAY
err = settimeofday(&tv, NULL); /* 0 is OK, -1 is error */
if(err == 0)
return STATUS_SUCCESS;
#else
err = 1;
#endif
}
ERR("Cannot set time to %d/%d/%d %d:%d:%d Time adjustment %ld %s\n",
tf.Year, tf.Month, tf.Day, tf.Hour, tf.Minute, tf.Second,
sec-oldsec, err == -1 ? "No Permission" :
sec == (time_t)-1 ? "" : "is too large." );
if(err == 2)
return STATUS_INVALID_PARAMETER;
else if(err == -1)
return STATUS_PRIVILEGE_NOT_HELD;
else
return STATUS_NOT_IMPLEMENTED;
}
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