dlls/ntdll/time.c

   1 /*
   2  * Conversion between Time and TimeFields
   3  *
   4  * RtlTimeToTimeFields, RtlTimeFieldsToTime and defines are taken from ReactOS and
   5  * adapted to wine with special permissions of the author
   6  * Rex Jolliff (rex@lvcablemodem.com)
   7  *
   8  * Copyright 1999 Juergen Schmied
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include "config.h"
  26 #include "wine/port.h"
  27
  28 #include <string.h>
  29 #include <time.h>
  30 #ifdef HAVE_SYS_TIME_H
  31 # include <sys/time.h>
  32 #endif
  33 #ifdef HAVE_UNISTD_H
  34 # include <unistd.h>
  35 #endif
  36 #include "ntddk.h"
  37 #include "wine/debug.h"
  38
  39 WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
  40
  41 #define TICKSPERSEC        10000000
  42 #define TICKSPERMSEC       10000
  43 #define SECSPERDAY         86400
  44 #define SECSPERHOUR        3600
  45 #define SECSPERMIN         60
  46 #define MINSPERHOUR        60
  47 #define HOURSPERDAY        24
  48 #define EPOCHWEEKDAY       0
  49 #define DAYSPERWEEK        7
  50 #define EPOCHYEAR          1601
  51 #define DAYSPERNORMALYEAR  365
  52 #define DAYSPERLEAPYEAR    366
  53 #define MONSPERYEAR        12
  54
  55 /* 1601 to 1970 is 369 years plus 89 leap days */
  56 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)86400)
  57 /* 1601 to 1980 is 379 years plus 91 leap days */
  58 #define SECS_1601_to_1980  ((379 * 365 + 91) * (ULONGLONG)86400)
  59
  60
  61 static const int YearLengths[2] = {DAYSPERNORMALYEAR, DAYSPERLEAPYEAR};
  62 static const int MonthLengths[2][MONSPERYEAR] =
  63 {
  64         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
  65         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
  66 };
  67
  68 static inline int IsLeapYear(int Year)
  69 {
  70         return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ? 1 : 0;
  71 }
  72
  73 static inline void NormalizeTimeFields(CSHORT *FieldToNormalize, CSHORT *CarryField,int Modulus)
  74 {
  75         *FieldToNormalize = (CSHORT) (*FieldToNormalize - Modulus);
  76         *CarryField = (CSHORT) (*CarryField + 1);
  77 }
  78
  79 /******************************************************************************
  80  *  RtlTimeToTimeFields         [NTDLL.@]
  81  *
  82  */
  83
  84 VOID WINAPI RtlTimeToTimeFields(
  85         PLARGE_INTEGER liTime,
  86         PTIME_FIELDS TimeFields)
  87 {
  88         const int *Months;
  89         int LeapSecondCorrections, SecondsInDay, CurYear;
  90         int LeapYear, CurMonth, GMTOffset;
  91         long int Days;
  92         LONGLONG Time = *(LONGLONG *)&liTime;
  93
  94         /* Extract millisecond from time and convert time into seconds */
  95         TimeFields->Milliseconds = (CSHORT) ((Time % TICKSPERSEC) / TICKSPERMSEC);
  96         Time = Time / TICKSPERSEC;
  97
  98         /* FIXME: Compute the number of leap second corrections here */
  99         LeapSecondCorrections = 0;
 100
 101         /* FIXME: get the GMT offset here */
 102         GMTOffset = 0;
 103
 104         /* Split the time into days and seconds within the day */
 105         Days = Time / SECSPERDAY;
 106         SecondsInDay = Time % SECSPERDAY;
 107
 108         /* Adjust the values for GMT and leap seconds */
 109         SecondsInDay += (GMTOffset - LeapSecondCorrections);
 110         while (SecondsInDay < 0)
 111         { SecondsInDay += SECSPERDAY;
 112           Days--;
 113         }
 114         while (SecondsInDay >= SECSPERDAY)
 115         { SecondsInDay -= SECSPERDAY;
 116           Days++;
 117         }
 118
 119         /* compute time of day */
 120         TimeFields->Hour = (CSHORT) (SecondsInDay / SECSPERHOUR);
 121         SecondsInDay = SecondsInDay % SECSPERHOUR;
 122         TimeFields->Minute = (CSHORT) (SecondsInDay / SECSPERMIN);
 123         TimeFields->Second = (CSHORT) (SecondsInDay % SECSPERMIN);
 124
 125         /* FIXME: handle the possibility that we are on a leap second (i.e. Second = 60) */
 126
 127         /* compute day of week */
 128         TimeFields->Weekday = (CSHORT) ((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
 129
 130         /* compute year */
 131         CurYear = EPOCHYEAR;
 132         /* FIXME: handle calendar modifications */
 133         while (1)
 134         { LeapYear = IsLeapYear(CurYear);
 135           if (Days < (long) YearLengths[LeapYear])
 136           { break;
 137           }
 138           CurYear++;
 139           Days = Days - (long) YearLengths[LeapYear];
 140         }
 141         TimeFields->Year = (CSHORT) CurYear;
 142
 143         /* Compute month of year */
 144         Months = MonthLengths[LeapYear];
 145         for (CurMonth = 0; Days >= (long) Months[CurMonth]; CurMonth++)
 146           Days = Days - (long) Months[CurMonth];
 147         TimeFields->Month = (CSHORT) (CurMonth + 1);
 148         TimeFields->Day = (CSHORT) (Days + 1);
 149 }
 150 /******************************************************************************
 151  *  RtlTimeFieldsToTime         [NTDLL.@]
 152  *
 153  */
 154 BOOLEAN WINAPI RtlTimeFieldsToTime(
 155         PTIME_FIELDS tfTimeFields,
 156         PLARGE_INTEGER Time)
 157 {
 158         int CurYear, CurMonth;
 159         LONGLONG rcTime;
 160         TIME_FIELDS TimeFields = *tfTimeFields;
 161
 162         rcTime = 0;
 163
 164         /* FIXME: normalize the TIME_FIELDS structure here */
 165         while (TimeFields.Second >= SECSPERMIN)
 166         { NormalizeTimeFields(&TimeFields.Second, &TimeFields.Minute, SECSPERMIN);
 167         }
 168         while (TimeFields.Minute >= MINSPERHOUR)
 169         { NormalizeTimeFields(&TimeFields.Minute, &TimeFields.Hour, MINSPERHOUR);
 170         }
 171         while (TimeFields.Hour >= HOURSPERDAY)
 172         { NormalizeTimeFields(&TimeFields.Hour, &TimeFields.Day, HOURSPERDAY);
 173         }
 174         while (TimeFields.Day > MonthLengths[IsLeapYear(TimeFields.Year)][TimeFields.Month - 1])
 175         { NormalizeTimeFields(&TimeFields.Day, &TimeFields.Month, SECSPERMIN);
 176         }
 177         while (TimeFields.Month > MONSPERYEAR)
 178         { NormalizeTimeFields(&TimeFields.Month, &TimeFields.Year, MONSPERYEAR);
 179         }
 180
 181         /* FIXME: handle calendar corrections here */
 182         for (CurYear = EPOCHYEAR; CurYear < TimeFields.Year; CurYear++)
 183         { rcTime += YearLengths[IsLeapYear(CurYear)];
 184         }
 185         for (CurMonth = 1; CurMonth < TimeFields.Month; CurMonth++)
 186         { rcTime += MonthLengths[IsLeapYear(CurYear)][CurMonth - 1];
 187         }
 188         rcTime += TimeFields.Day - 1;
 189         rcTime *= SECSPERDAY;
 190         rcTime += TimeFields.Hour * SECSPERHOUR + TimeFields.Minute * SECSPERMIN + TimeFields.Second;
 191         rcTime *= TICKSPERSEC;
 192         rcTime += TimeFields.Milliseconds * TICKSPERMSEC;
 193         *Time = *(LARGE_INTEGER *)&rcTime;
 194
 195         return TRUE;
 196 }
 197 /************* end of code by Rex Jolliff (rex@lvcablemodem.com) *******************/
 198
 199 /******************************************************************************
 200  *  RtlSystemTimeToLocalTime    [NTDLL.@]
 201  */
 202 VOID WINAPI RtlSystemTimeToLocalTime(
 203         IN  PLARGE_INTEGER SystemTime,
 204         OUT PLARGE_INTEGER LocalTime)
 205 {
 206         FIXME("(%p, %p),stub!\n",SystemTime,LocalTime);
 207
 208         memcpy (LocalTime, SystemTime, sizeof (PLARGE_INTEGER));
 209 }
 210
 211 /******************************************************************************
 212  *  RtlTimeToSecondsSince1970           [NTDLL.@]
 213  */
 214 BOOLEAN WINAPI RtlTimeToSecondsSince1970( const FILETIME *time, LPDWORD res )
 215 {
 216     ULONGLONG tmp = ((ULONGLONG)time->dwHighDateTime << 32) | time->dwLowDateTime;
 217     tmp = RtlLargeIntegerDivide( tmp, 10000000, NULL );
 218     tmp -= SECS_1601_TO_1970;
 219     if (tmp > 0xffffffff) return FALSE;
 220     *res = (DWORD)tmp;
 221     return TRUE;
 222 }
 223
 224 /******************************************************************************
 225  *  RtlTimeToSecondsSince1980           [NTDLL.@]
 226  */
 227 BOOLEAN WINAPI RtlTimeToSecondsSince1980( const FILETIME *time, LPDWORD res )
 228 {
 229     ULONGLONG tmp = ((ULONGLONG)time->dwHighDateTime << 32) | time->dwLowDateTime;
 230     tmp = RtlLargeIntegerDivide( tmp, 10000000, NULL );
 231     tmp -= SECS_1601_to_1980;
 232     if (tmp > 0xffffffff) return FALSE;
 233     *res = (DWORD)tmp;
 234     return TRUE;
 235 }
 236
 237 /******************************************************************************
 238  *  RtlSecondsSince1970ToTime           [NTDLL.@]
 239  */
 240 void WINAPI RtlSecondsSince1970ToTime( DWORD time, FILETIME *res )
 241 {
 242     ULONGLONG secs = RtlExtendedIntegerMultiply( time + SECS_1601_TO_1970, 10000000 );
 243     res->dwLowDateTime  = (DWORD)secs;
 244     res->dwHighDateTime = (DWORD)(secs >> 32);
 245 }
 246
 247 /******************************************************************************
 248  *  RtlSecondsSince1980ToTime           [NTDLL.@]
 249  */
 250 void WINAPI RtlSecondsSince1980ToTime( DWORD time, FILETIME *res )
 251 {
 252     ULONGLONG secs = RtlExtendedIntegerMultiply( time + SECS_1601_to_1980, 10000000 );
 253     res->dwLowDateTime  = (DWORD)secs;
 254     res->dwHighDateTime = (DWORD)(secs >> 32);
 255 }
 256
 257 /******************************************************************************
 258  * RtlTimeToElapsedTimeFields [NTDLL.@]
 259  * FIXME: prototype guessed
 260  */
 261 VOID WINAPI RtlTimeToElapsedTimeFields(
 262         PLARGE_INTEGER liTime,
 263         PTIME_FIELDS TimeFields)
 264 {
 265         FIXME("(%p,%p): stub\n",liTime,TimeFields);
 266 }
 267
 268 /***********************************************************************
 269  *      NtQuerySystemTime   (NTDLL.@)
 270  *      ZwQuerySystemTime   (NTDLL.@)
 271  */
 272 void WINAPI NtQuerySystemTime( LARGE_INTEGER *time )
 273 {
 274     ULONGLONG secs;
 275     struct timeval now;
 276
 277     gettimeofday( &now, 0 );
 278     secs = RtlExtendedIntegerMultiply( now.tv_sec+SECS_1601_TO_1970, 10000000 ) + now.tv_usec * 10;
 279     time->s.LowPart  = (DWORD)secs;
 280     time->s.HighPart = (DWORD)(secs >> 32);
 281 }