reactos/ntoskrnl/ex/time.c

   1 /* $Id: time.c,v 1.11 2000/10/22 16:36:49 ekohl Exp $
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            ntoskrnl/ex/time.c
   6  * PURPOSE:         Time
   7  * PROGRAMMER:      David Welch (welch@mcmail.com)
   8  * UPDATE HISTORY:
   9  *                  Created 22/05/98
  10  */
  11
  12 /* INCLUDES *****************************************************************/
  13
  14 #include <ddk/ntddk.h>
  15 #include <internal/ex.h>
  16
  17 #include <internal/debug.h>
  18
  19
  20 #define TICKSPERMINUTE  600000000
  21
  22 /* GLOBALS ******************************************************************/
  23
  24 /* Note: Bias[minutes] = UTC - local time */
  25 TIME_ZONE_INFORMATION _SystemTimeZoneInfo;
  26
  27
  28 /* FUNCTIONS ****************************************************************/
  29
  30 VOID
  31 ExInitTimeZoneInfo (VOID)
  32 {
  33   /* Initialize system time zone information */
  34   memset (& _SystemTimeZoneInfo, 0, sizeof(TIME_ZONE_INFORMATION));
  35
  36   /* FIXME: Read time zone information from the registry */
  37
  38 }
  39
  40
  41 NTSTATUS
  42 STDCALL
  43 NtSetSystemTime (
  44         IN      PLARGE_INTEGER  SystemTime,
  45         IN      PLARGE_INTEGER  NewSystemTime   OPTIONAL
  46         )
  47 {
  48 //        HalSetRealTimeClock ((PTIME)SystemTime);
  49 //        UNIMPLEMENTED;
  50         return STATUS_SUCCESS;
  51 }
  52
  53
  54 NTSTATUS
  55 STDCALL
  56 NtQuerySystemTime (
  57         OUT     TIME    * CurrentTime
  58         )
  59 {
  60         KeQuerySystemTime((PLARGE_INTEGER)CurrentTime);
  61         return STATUS_SUCCESS;
  62 }
  63
  64
  65 VOID
  66 STDCALL
  67 ExLocalTimeToSystemTime (
  68         PLARGE_INTEGER  LocalTime,
  69         PLARGE_INTEGER  SystemTime
  70         )
  71 {
  72    SystemTime->QuadPart = LocalTime->QuadPart +
  73                           _SystemTimeZoneInfo.Bias * TICKSPERMINUTE;
  74 }
  75
  76
  77 VOID
  78 STDCALL
  79 ExSystemTimeToLocalTime (
  80         PLARGE_INTEGER  SystemTime,
  81         PLARGE_INTEGER  LocalTime
  82         )
  83 {
  84    LocalTime->QuadPart = SystemTime->QuadPart -
  85                          _SystemTimeZoneInfo.Bias * TICKSPERMINUTE;
  86 }
  87
  88 /* EOF */