dlls/ntdll/time.c

   1 /*
   2  * Nt time functions.
   3  *
   4  * RtlTimeToTimeFields, RtlTimeFieldsToTime and defines are taken from ReactOS and
   5  * adapted to wine with special permissions of the author. This code is
   6  * Copyright 2002 Rex Jolliff (rex@lvcablemodem.com)
   7  *
   8  * Copyright 1999 Juergen Schmied
   9  * Copyright 2007 Dmitry Timoshkov
  10  *
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Lesser General Public
  13  * License as published by the Free Software Foundation; either
  14  * version 2.1 of the License, or (at your option) any later version.
  15  *
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public
  22  * License along with this library; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  24  */
  25
  26 #include "config.h"
  27 #include "wine/port.h"
  28
  29 #include <stdarg.h>
  30 #include <stdlib.h>
  31 #include <errno.h>
  32 #include <string.h>
  33 #include <limits.h>
  34 #include <time.h>
  35 #ifdef HAVE_SYS_TIME_H
  36 # include <sys/time.h>
  37 #endif
  38 #ifdef HAVE_UNISTD_H
  39 # include <unistd.h>
  40 #endif
  41
  42 #define NONAMELESSUNION
  43 #define NONAMELESSSTRUCT
  44 #include "ntstatus.h"
  45 #define WIN32_NO_STATUS
  46 #include "windef.h"
  47 #include "winternl.h"
  48 #include "wine/unicode.h"
  49 #include "wine/debug.h"
  50 #include "ntdll_misc.h"
  51
  52 WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
  53
  54 static RTL_CRITICAL_SECTION TIME_tz_section;
  55 static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
  56 {
  57     0, 0, &TIME_tz_section,
  58     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  59       0, 0, { (DWORD_PTR)(__FILE__ ": TIME_tz_section") }
  60 };
  61 static RTL_CRITICAL_SECTION TIME_tz_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  62
  63 #define SETTIME_MAX_ADJUST 120
  64
  65 #define TICKSPERSEC        10000000
  66 #define TICKSPERMSEC       10000
  67 #define SECSPERDAY         86400
  68 #define SECSPERHOUR        3600
  69 #define SECSPERMIN         60
  70 #define MINSPERHOUR        60
  71 #define HOURSPERDAY        24
  72 #define EPOCHWEEKDAY       1  /* Jan 1, 1601 was Monday */
  73 #define DAYSPERWEEK        7
  74 #define EPOCHYEAR          1601
  75 #define DAYSPERNORMALYEAR  365
  76 #define DAYSPERLEAPYEAR    366
  77 #define MONSPERYEAR        12
  78 #define DAYSPERQUADRICENTENNIUM (365 * 400 + 97)
  79 #define DAYSPERNORMALCENTURY (365 * 100 + 24)
  80 #define DAYSPERNORMALQUADRENNIUM (365 * 4 + 1)
  81
  82 /* 1601 to 1970 is 369 years plus 89 leap days */
  83 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
  84 #define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
  85 /* 1601 to 1980 is 379 years plus 91 leap days */
  86 #define SECS_1601_TO_1980  ((379 * 365 + 91) * (ULONGLONG)SECSPERDAY)
  87 #define TICKS_1601_TO_1980 (SECS_1601_TO_1980 * TICKSPERSEC)
  88 /* max ticks that can be represented as Unix time */
  89 #define TICKS_1601_TO_UNIX_MAX ((SECS_1601_TO_1970 + INT_MAX) * TICKSPERSEC)
  90
  91
  92 static const int MonthLengths[2][MONSPERYEAR] =
  93 {
  94         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
  95         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
  96 };
  97
  98 static inline int IsLeapYear(int Year)
  99 {
 100         return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ? 1 : 0;
 101 }
 102
 103 /******************************************************************************
 104  *       RtlTimeToTimeFields [NTDLL.@]
 105  *
 106  * Convert a time into a TIME_FIELDS structure.
 107  *
 108  * PARAMS
 109  *   liTime     [I] Time to convert.
 110  *   TimeFields [O] Destination for the converted time.
 111  *
 112  * RETURNS
 113  *   Nothing.
 114  */
 115 VOID WINAPI RtlTimeToTimeFields(
 116         const LARGE_INTEGER *liTime,
 117         PTIME_FIELDS TimeFields)
 118 {
 119         int SecondsInDay;
 120         long int cleaps, years, yearday, months;
 121         long int Days;
 122         LONGLONG Time;
 123
 124         /* Extract millisecond from time and convert time into seconds */
 125         TimeFields->Milliseconds =
 126             (CSHORT) (( liTime->QuadPart % TICKSPERSEC) / TICKSPERMSEC);
 127         Time = liTime->QuadPart / TICKSPERSEC;
 128
 129         /* The native version of RtlTimeToTimeFields does not take leap seconds
 130          * into account */
 131
 132         /* Split the time into days and seconds within the day */
 133         Days = Time / SECSPERDAY;
 134         SecondsInDay = Time % SECSPERDAY;
 135
 136         /* compute time of day */
 137         TimeFields->Hour = (CSHORT) (SecondsInDay / SECSPERHOUR);
 138         SecondsInDay = SecondsInDay % SECSPERHOUR;
 139         TimeFields->Minute = (CSHORT) (SecondsInDay / SECSPERMIN);
 140         TimeFields->Second = (CSHORT) (SecondsInDay % SECSPERMIN);
 141
 142         /* compute day of week */
 143         TimeFields->Weekday = (CSHORT) ((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
 144
 145         /* compute year, month and day of month. */
 146         cleaps=( 3 * ((4 * Days + 1227) / DAYSPERQUADRICENTENNIUM) + 3 ) / 4;
 147         Days += 28188 + cleaps;
 148         years = (20 * Days - 2442) / (5 * DAYSPERNORMALQUADRENNIUM);
 149         yearday = Days - (years * DAYSPERNORMALQUADRENNIUM)/4;
 150         months = (64 * yearday) / 1959;
 151         /* the result is based on a year starting on March.
 152          * To convert take 12 from Januari and Februari and
 153          * increase the year by one. */
 154         if( months < 14 ) {
 155             TimeFields->Month = months - 1;
 156             TimeFields->Year = years + 1524;
 157         } else {
 158             TimeFields->Month = months - 13;
 159             TimeFields->Year = years + 1525;
 160         }
 161         /* calculation of day of month is based on the wonderful
 162          * sequence of INT( n * 30.6): it reproduces the
 163          * 31-30-31-30-31-31 month lengths exactly for small n's */
 164         TimeFields->Day = yearday - (1959 * months) / 64 ;
 165         return;
 166 }
 167
 168 /******************************************************************************
 169  *       RtlTimeFieldsToTime [NTDLL.@]
 170  *
 171  * Convert a TIME_FIELDS structure into a time.
 172  *
 173  * PARAMS
 174  *   ftTimeFields [I] TIME_FIELDS structure to convert.
 175  *   Time         [O] Destination for the converted time.
 176  *
 177  * RETURNS
 178  *   Success: TRUE.
 179  *   Failure: FALSE.
 180  */
 181 BOOLEAN WINAPI RtlTimeFieldsToTime(
 182         PTIME_FIELDS tfTimeFields,
 183         PLARGE_INTEGER Time)
 184 {
 185         int month, year, cleaps, day;
 186
 187         /* FIXME: normalize the TIME_FIELDS structure here */
 188         /* No, native just returns 0 (error) if the fields are not */
 189         if( tfTimeFields->Milliseconds< 0 || tfTimeFields->Milliseconds > 999 ||
 190                 tfTimeFields->Second < 0 || tfTimeFields->Second > 59 ||
 191                 tfTimeFields->Minute < 0 || tfTimeFields->Minute > 59 ||
 192                 tfTimeFields->Hour < 0 || tfTimeFields->Hour > 23 ||
 193                 tfTimeFields->Month < 1 || tfTimeFields->Month > 12 ||
 194                 tfTimeFields->Day < 1 ||
 195                 tfTimeFields->Day > MonthLengths
 196                     [ tfTimeFields->Month ==2 || IsLeapYear(tfTimeFields->Year)]
 197                     [ tfTimeFields->Month - 1] ||
 198                 tfTimeFields->Year < 1601 )
 199             return FALSE;
 200
 201         /* now calculate a day count from the date
 202          * First start counting years from March. This way the leap days
 203          * are added at the end of the year, not somewhere in the middle.
 204          * Formula's become so much less complicate that way.
 205          * To convert: add 12 to the month numbers of Jan and Feb, and
 206          * take 1 from the year */
 207         if(tfTimeFields->Month < 3) {
 208             month = tfTimeFields->Month + 13;
 209             year = tfTimeFields->Year - 1;
 210         } else {
 211             month = tfTimeFields->Month + 1;
 212             year = tfTimeFields->Year;
 213         }
 214         cleaps = (3 * (year / 100) + 3) / 4;   /* nr of "century leap years"*/
 215         day =  (36525 * year) / 100 - cleaps + /* year * dayperyr, corrected */
 216                  (1959 * month) / 64 +         /* months * daypermonth */
 217                  tfTimeFields->Day -          /* day of the month */
 218                  584817 ;                      /* zero that on 1601-01-01 */
 219         /* done */
 220
 221         Time->QuadPart = (((((LONGLONG) day * HOURSPERDAY +
 222             tfTimeFields->Hour) * MINSPERHOUR +
 223             tfTimeFields->Minute) * SECSPERMIN +
 224             tfTimeFields->Second ) * 1000 +
 225             tfTimeFields->Milliseconds ) * TICKSPERMSEC;
 226
 227         return TRUE;
 228 }
 229
 230 /***********************************************************************
 231  *       TIME_GetBias [internal]
 232  *
 233  * Helper function calculates delta local time from UTC.
 234  *
 235  * PARAMS
 236  *   utc [I] The current utc time.
 237  *   pdaylight [I] Local daylight.
 238  *
 239  * RETURNS
 240  *   The bias for the current timezone.
 241  */
 242 static int TIME_GetBias(time_t utc, int *pdaylight)
 243 {
 244     struct tm *ptm;
 245     static time_t last_utc;
 246     static int last_bias;
 247     static int last_daylight;
 248     int ret;
 249
 250     RtlEnterCriticalSection( &TIME_tz_section );
 251     if (utc != last_utc)
 252     {
 253         ptm = localtime(&utc);
 254         last_daylight = ptm->tm_isdst; /* daylight for local timezone */
 255         ptm = gmtime(&utc);
 256         ptm->tm_isdst = last_daylight; /* use local daylight, not that of Greenwich */
 257         last_utc = utc;
 258         last_bias = (int)(utc - mktime(ptm));
 259     }
 260
 261     *pdaylight = last_daylight;
 262     ret = last_bias;
 263
 264     RtlLeaveCriticalSection( &TIME_tz_section );
 265     return ret;
 266 }
 267
 268 /******************************************************************************
 269  *        RtlLocalTimeToSystemTime [NTDLL.@]
 270  *
 271  * Convert a local time into system time.
 272  *
 273  * PARAMS
 274  *   LocalTime  [I] Local time to convert.
 275  *   SystemTime [O] Destination for the converted time.
 276  *
 277  * RETURNS
 278  *   Success: STATUS_SUCCESS.
 279  *   Failure: An NTSTATUS error code indicating the problem.
 280  */
 281 NTSTATUS WINAPI RtlLocalTimeToSystemTime( const LARGE_INTEGER *LocalTime,
 282                                           PLARGE_INTEGER SystemTime)
 283 {
 284     time_t gmt;
 285     int bias, daylight;
 286
 287     TRACE("(%p, %p)\n", LocalTime, SystemTime);
 288
 289     gmt = time(NULL);
 290     bias = TIME_GetBias(gmt, &daylight);
 291
 292     SystemTime->QuadPart = LocalTime->QuadPart - bias * (LONGLONG)TICKSPERSEC;
 293     return STATUS_SUCCESS;
 294 }
 295
 296 /******************************************************************************
 297  *       RtlSystemTimeToLocalTime [NTDLL.@]
 298  *
 299  * Convert a system time into a local time.
 300  *
 301  * PARAMS
 302  *   SystemTime [I] System time to convert.
 303  *   LocalTime  [O] Destination for the converted time.
 304  *
 305  * RETURNS
 306  *   Success: STATUS_SUCCESS.
 307  *   Failure: An NTSTATUS error code indicating the problem.
 308  */
 309 NTSTATUS WINAPI RtlSystemTimeToLocalTime( const LARGE_INTEGER *SystemTime,
 310                                           PLARGE_INTEGER LocalTime )
 311 {
 312     time_t gmt;
 313     int bias, daylight;
 314
 315     TRACE("(%p, %p)\n", SystemTime, LocalTime);
 316
 317     gmt = time(NULL);
 318     bias = TIME_GetBias(gmt, &daylight);
 319
 320     LocalTime->QuadPart = SystemTime->QuadPart + bias * (LONGLONG)TICKSPERSEC;
 321     return STATUS_SUCCESS;
 322 }
 323
 324 /******************************************************************************
 325  *       RtlTimeToSecondsSince1970 [NTDLL.@]
 326  *
 327  * Convert a time into a count of seconds since 1970.
 328  *
 329  * PARAMS
 330  *   Time    [I] Time to convert.
 331  *   Seconds [O] Destination for the converted time.
 332  *
 333  * RETURNS
 334  *   Success: TRUE.
 335  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 336  */
 337 BOOLEAN WINAPI RtlTimeToSecondsSince1970( const LARGE_INTEGER *Time, LPDWORD Seconds )
 338 {
 339     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 340     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 341     tmp -= SECS_1601_TO_1970;
 342     if (tmp > 0xffffffff) return FALSE;
 343     *Seconds = (DWORD)tmp;
 344     return TRUE;
 345 }
 346
 347 /******************************************************************************
 348  *       RtlTimeToSecondsSince1980 [NTDLL.@]
 349  *
 350  * Convert a time into a count of seconds since 1980.
 351  *
 352  * PARAMS
 353  *   Time    [I] Time to convert.
 354  *   Seconds [O] Destination for the converted time.
 355  *
 356  * RETURNS
 357  *   Success: TRUE.
 358  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 359  */
 360 BOOLEAN WINAPI RtlTimeToSecondsSince1980( const LARGE_INTEGER *Time, LPDWORD Seconds )
 361 {
 362     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 363     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 364     tmp -= SECS_1601_TO_1980;
 365     if (tmp > 0xffffffff) return FALSE;
 366     *Seconds = (DWORD)tmp;
 367     return TRUE;
 368 }
 369
 370 /******************************************************************************
 371  *       RtlSecondsSince1970ToTime [NTDLL.@]
 372  *
 373  * Convert a count of seconds since 1970 to a time.
 374  *
 375  * PARAMS
 376  *   Seconds [I] Time to convert.
 377  *   Time    [O] Destination for the converted time.
 378  *
 379  * RETURNS
 380  *   Nothing.
 381  */
 382 void WINAPI RtlSecondsSince1970ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 383 {
 384     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 385     Time->u.LowPart  = (DWORD)secs;
 386     Time->u.HighPart = (DWORD)(secs >> 32);
 387 }
 388
 389 /******************************************************************************
 390  *       RtlSecondsSince1980ToTime [NTDLL.@]
 391  *
 392  * Convert a count of seconds since 1980 to a time.
 393  *
 394  * PARAMS
 395  *   Seconds [I] Time to convert.
 396  *   Time    [O] Destination for the converted time.
 397  *
 398  * RETURNS
 399  *   Nothing.
 400  */
 401 void WINAPI RtlSecondsSince1980ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 402 {
 403     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1980;
 404     Time->u.LowPart  = (DWORD)secs;
 405     Time->u.HighPart = (DWORD)(secs >> 32);
 406 }
 407
 408 /******************************************************************************
 409  *       RtlTimeToElapsedTimeFields [NTDLL.@]
 410  *
 411  * Convert a time to a count of elapsed seconds.
 412  *
 413  * PARAMS
 414  *   Time       [I] Time to convert.
 415  *   TimeFields [O] Destination for the converted time.
 416  *
 417  * RETURNS
 418  *   Nothing.
 419  */
 420 void WINAPI RtlTimeToElapsedTimeFields( const LARGE_INTEGER *Time, PTIME_FIELDS TimeFields )
 421 {
 422     LONGLONG time;
 423     INT rem;
 424
 425     time = RtlExtendedLargeIntegerDivide( Time->QuadPart, TICKSPERSEC, &rem );
 426     TimeFields->Milliseconds = rem / TICKSPERMSEC;
 427
 428     /* time is now in seconds */
 429     TimeFields->Year  = 0;
 430     TimeFields->Month = 0;
 431     TimeFields->Day   = RtlExtendedLargeIntegerDivide( time, SECSPERDAY, &rem );
 432
 433     /* rem is now the remaining seconds in the last day */
 434     TimeFields->Second = rem % 60;
 435     rem /= 60;
 436     TimeFields->Minute = rem % 60;
 437     TimeFields->Hour = rem / 60;
 438 }
 439
 440 /***********************************************************************
 441  *       NtQuerySystemTime [NTDLL.@]
 442  *       ZwQuerySystemTime [NTDLL.@]
 443  *
 444  * Get the current system time.
 445  *
 446  * PARAMS
 447  *   Time [O] Destination for the current system time.
 448  *
 449  * RETURNS
 450  *   Success: STATUS_SUCCESS.
 451  *   Failure: An NTSTATUS error code indicating the problem.
 452  */
 453 NTSTATUS WINAPI NtQuerySystemTime( PLARGE_INTEGER Time )
 454 {
 455     struct timeval now;
 456
 457     gettimeofday( &now, 0 );
 458     Time->QuadPart = now.tv_sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 459     Time->QuadPart += now.tv_usec * 10;
 460     return STATUS_SUCCESS;
 461 }
 462
 463 /******************************************************************************
 464  *  NtQueryPerformanceCounter   [NTDLL.@]
 465  *
 466  *  Note: Windows uses a timer clocked at a multiple of 1193182 Hz. There is a
 467  *  good number of applications that crash when the returned frequency is either
 468  *  lower or higher than what Windows gives. Also too high counter values are
 469  *  reported to give problems.
 470  */
 471 NTSTATUS WINAPI NtQueryPerformanceCounter( PLARGE_INTEGER Counter, PLARGE_INTEGER Frequency )
 472 {
 473     LARGE_INTEGER now;
 474
 475     if (!Counter) return STATUS_ACCESS_VIOLATION;
 476
 477     /* convert a counter that increments at a rate of 10 MHz
 478      * to one of 1.193182 MHz, with some care for arithmetic
 479      * overflow and good accuracy (21/176 = 0.11931818) */
 480     NtQuerySystemTime( &now );
 481     Counter->QuadPart = ((now.QuadPart - server_start_time) * 21) / 176;
 482     if (Frequency) Frequency->QuadPart = 1193182;
 483     return STATUS_SUCCESS;
 484 }
 485
 486
 487 /******************************************************************************
 488  * NtGetTickCount   (NTDLL.@)
 489  * ZwGetTickCount   (NTDLL.@)
 490  */
 491 ULONG WINAPI NtGetTickCount(void)
 492 {
 493     LARGE_INTEGER now;
 494
 495     NtQuerySystemTime( &now );
 496     return (now.QuadPart - server_start_time) / 10000;
 497 }
 498
 499 /* calculate the mday of dst change date, so that for instance Sun 5 Oct 2007
 500  * (last Sunday in October of 2007) becomes Sun Oct 28 2007
 501  *
 502  * Note: year, day and month must be in unix format.
 503  */
 504 static int weekday_to_mday(int year, int day, int mon, int day_of_week)
 505 {
 506     struct tm date;
 507     time_t tmp;
 508     int wday, mday;
 509
 510     /* find first day in the month matching week day of the date */
 511     memset(&date, 0, sizeof(date));
 512     date.tm_year = year;
 513     date.tm_mon = mon;
 514     date.tm_mday = -1;
 515     date.tm_wday = -1;
 516     do
 517     {
 518         date.tm_mday++;
 519         tmp = mktime(&date);
 520     } while (date.tm_wday != day_of_week || date.tm_mon != mon);
 521
 522     mday = date.tm_mday;
 523
 524     /* find number of week days in the month matching week day of the date */
 525     wday = 1; /* 1 - 1st, ...., 5 - last */
 526     while (wday < day)
 527     {
 528         struct tm *tm;
 529
 530         date.tm_mday += 7;
 531         tmp = mktime(&date);
 532         tm = localtime(&tmp);
 533         if (tm->tm_mon != mon)
 534             break;
 535         mday = tm->tm_mday;
 536         wday++;
 537     }
 538
 539     return mday;
 540 }
 541
 542 static BOOL match_tz_date(const RTL_SYSTEM_TIME *st, const RTL_SYSTEM_TIME *reg_st)
 543 {
 544     WORD wDay;
 545
 546     if (st->wMonth != reg_st->wMonth) return FALSE;
 547
 548     if (!st->wMonth) return TRUE; /* no transition dates */
 549
 550     wDay = reg_st->wDay;
 551     if (!reg_st->wYear) /* date in a day-of-week format */
 552         wDay = weekday_to_mday(st->wYear - 1900, reg_st->wDay, reg_st->wMonth - 1, reg_st->wDayOfWeek);
 553
 554     if (st->wDay != wDay ||
 555         st->wHour != reg_st->wHour ||
 556         st->wMinute != reg_st->wMinute ||
 557         st->wSecond != reg_st->wSecond ||
 558         st->wMilliseconds != reg_st->wMilliseconds) return FALSE;
 559
 560     return TRUE;
 561 }
 562
 563 static BOOL match_tz_info(const RTL_TIME_ZONE_INFORMATION *tzi, const RTL_TIME_ZONE_INFORMATION *reg_tzi)
 564 {
 565     if (tzi->Bias == reg_tzi->Bias &&
 566         match_tz_date(&tzi->StandardDate, &reg_tzi->StandardDate) &&
 567         match_tz_date(&tzi->DaylightDate, &reg_tzi->DaylightDate))
 568         return TRUE;
 569
 570     return FALSE;
 571 }
 572
 573 static BOOL reg_query_value(HKEY hkey, LPCWSTR name, DWORD type, void *data, DWORD count)
 574 {
 575     UNICODE_STRING nameW;
 576     char buf[256];
 577     KEY_VALUE_PARTIAL_INFORMATION *info = (KEY_VALUE_PARTIAL_INFORMATION *)buf;
 578
 579     if (count > sizeof(buf) - sizeof(KEY_VALUE_PARTIAL_INFORMATION))
 580         return FALSE;
 581
 582     RtlInitUnicodeString(&nameW, name);
 583
 584     if (NtQueryValueKey(hkey, &nameW, KeyValuePartialInformation,
 585                         buf, sizeof(buf), &count))
 586         return FALSE;
 587
 588     if (info->Type != type) return FALSE;
 589
 590     memcpy(data, info->Data, info->DataLength);
 591     return TRUE;
 592 }
 593
 594 static void find_reg_tz_info(RTL_TIME_ZONE_INFORMATION *tzi)
 595 {
 596     static const WCHAR Time_ZonesW[] = { 'M','a','c','h','i','n','e','\\',
 597         'S','o','f','t','w','a','r','e','\\',
 598         'M','i','c','r','o','s','o','f','t','\\',
 599         'W','i','n','d','o','w','s',' ','N','T','\\',
 600         'C','u','r','r','e','n','t','V','e','r','s','i','o','n','\\',
 601         'T','i','m','e',' ','Z','o','n','e','s',0 };
 602     HANDLE hkey;
 603     ULONG idx;
 604     OBJECT_ATTRIBUTES attr;
 605     UNICODE_STRING nameW;
 606     WCHAR buf[128];
 607
 608     attr.Length = sizeof(attr);
 609     attr.RootDirectory = 0;
 610     attr.ObjectName = &nameW;
 611     attr.Attributes = 0;
 612     attr.SecurityDescriptor = NULL;
 613     attr.SecurityQualityOfService = NULL;
 614     RtlInitUnicodeString(&nameW, Time_ZonesW);
 615     if (NtOpenKey(&hkey, KEY_READ, &attr))
 616     {
 617         WARN("Unable to open the time zones key\n");
 618         return;
 619     }
 620
 621     idx = 0;
 622     nameW.Buffer = buf;
 623     nameW.Length = sizeof(buf);
 624     nameW.MaximumLength = sizeof(buf);
 625
 626     while (!RtlpNtEnumerateSubKey(hkey, &nameW, idx++))
 627     {
 628         static const WCHAR stdW[] = { 'S','t','d',0 };
 629         static const WCHAR dltW[] = { 'D','l','t',0 };
 630         static const WCHAR tziW[] = { 'T','Z','I',0 };
 631         RTL_TIME_ZONE_INFORMATION reg_tzi;
 632         HANDLE hSubkey;
 633         struct tz_reg_data
 634         {
 635             LONG bias;
 636             LONG std_bias;
 637             LONG dlt_bias;
 638             RTL_SYSTEM_TIME std_date;
 639             RTL_SYSTEM_TIME dlt_date;
 640         } tz_data;
 641
 642         attr.Length = sizeof(attr);
 643         attr.RootDirectory = hkey;
 644         attr.ObjectName = &nameW;
 645         attr.Attributes = 0;
 646         attr.SecurityDescriptor = NULL;
 647         attr.SecurityQualityOfService = NULL;
 648         if (NtOpenKey(&hSubkey, KEY_READ, &attr))
 649         {
 650             WARN("Unable to open subkey %s\n", debugstr_wn(nameW.Buffer, nameW.Length/sizeof(WCHAR)));
 651             continue;
 652         }
 653
 654 #define get_value(hkey, name, type, data, len) \
 655     if (!reg_query_value(hkey, name, type, data, len)) \
 656     { \
 657         WARN("can't read data from %s\n", debugstr_w(name)); \
 658         NtClose(hkey); \
 659         continue; \
 660     }
 661
 662         get_value(hSubkey, stdW, REG_SZ, reg_tzi.StandardName, sizeof(reg_tzi.StandardName));
 663         get_value(hSubkey, dltW, REG_SZ, reg_tzi.DaylightName, sizeof(reg_tzi.DaylightName));
 664         get_value(hSubkey, tziW, REG_BINARY, &tz_data, sizeof(tz_data));
 665
 666 #undef get_value
 667
 668         reg_tzi.Bias = tz_data.bias;
 669         reg_tzi.StandardBias = tz_data.std_bias;
 670         reg_tzi.DaylightBias = tz_data.dlt_bias;
 671         reg_tzi.StandardDate = tz_data.std_date;
 672         reg_tzi.DaylightDate = tz_data.dlt_date;
 673
 674         TRACE("%s: bias %d\n", debugstr_wn(nameW.Buffer, nameW.Length/sizeof(WCHAR)), reg_tzi.Bias);
 675         TRACE("std (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 676             reg_tzi.StandardDate.wDay, reg_tzi.StandardDate.wMonth,
 677             reg_tzi.StandardDate.wYear, reg_tzi.StandardDate.wDayOfWeek,
 678             reg_tzi.StandardDate.wHour, reg_tzi.StandardDate.wMinute,
 679             reg_tzi.StandardDate.wSecond, reg_tzi.StandardDate.wMilliseconds,
 680             reg_tzi.StandardBias);
 681         TRACE("dst (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 682             reg_tzi.DaylightDate.wDay, reg_tzi.DaylightDate.wMonth,
 683             reg_tzi.DaylightDate.wYear, reg_tzi.DaylightDate.wDayOfWeek,
 684             reg_tzi.DaylightDate.wHour, reg_tzi.DaylightDate.wMinute,
 685             reg_tzi.DaylightDate.wSecond, reg_tzi.DaylightDate.wMilliseconds,
 686             reg_tzi.DaylightBias);
 687
 688         NtClose(hSubkey);
 689
 690         if (match_tz_info(tzi, &reg_tzi))
 691         {
 692             memcpy(tzi, &reg_tzi, sizeof(*tzi));
 693             NtClose(hkey);
 694             return;
 695         }
 696
 697         /* reset len */
 698         nameW.Length = sizeof(buf);
 699         nameW.MaximumLength = sizeof(buf);
 700     }
 701
 702     NtClose(hkey);
 703
 704     FIXME("Can't find matching timezone information in the registry for "
 705           "bias %d, std (d/m/y): %u/%02u/%04u, dlt (d/m/y): %u/%02u/%04u\n",
 706           tzi->Bias,
 707           tzi->StandardDate.wDay, tzi->StandardDate.wMonth, tzi->StandardDate.wYear,
 708           tzi->DaylightDate.wDay, tzi->DaylightDate.wMonth, tzi->DaylightDate.wYear);
 709 }
 710
 711 static time_t find_dst_change(unsigned long min, unsigned long max, int *is_dst)
 712 {
 713     time_t start;
 714     struct tm *tm;
 715
 716     start = min;
 717     tm = localtime(&start);
 718     *is_dst = !tm->tm_isdst;
 719     TRACE("starting date isdst %d, %s", !*is_dst, ctime(&start));
 720
 721     while (min <= max)
 722     {
 723         time_t pos = (min + max) / 2;
 724         tm = localtime(&pos);
 725
 726         if (tm->tm_isdst != *is_dst)
 727             min = pos + 1;
 728         else
 729             max = pos - 1;
 730     }
 731     return min;
 732 }
 733
 734 static void init_tz_info(RTL_TIME_ZONE_INFORMATION *tzi, int *valid_year)
 735 {
 736     struct tm *tm;
 737     time_t year_start, year_end, tmp, dlt = 0, std = 0;
 738     int is_dst;
 739
 740     year_start = time(NULL);
 741     tm = localtime(&year_start);
 742
 743     if (*valid_year == tm->tm_year) return;
 744
 745     memset(tzi, 0, sizeof(*tzi));
 746
 747     TRACE("tz data will be valid through year %d\n", tm->tm_year + 1900);
 748     *valid_year = tm->tm_year;
 749
 750     tm->tm_isdst = 0;
 751     tm->tm_mday = 1;
 752     tm->tm_mon = tm->tm_hour = tm->tm_min = tm->tm_sec = tm->tm_wday = tm->tm_yday = 0;
 753     year_start = mktime(tm);
 754     TRACE("year_start: %s", ctime(&year_start));
 755
 756     tm->tm_mday = tm->tm_wday = tm->tm_yday = 0;
 757     tm->tm_mon = 12;
 758     tm->tm_hour = 23;
 759     tm->tm_min = tm->tm_sec = 59;
 760     year_end = mktime(tm);
 761     TRACE("year_end: %s", ctime(&year_end));
 762
 763     tm = gmtime(&year_start);
 764     tzi->Bias = (LONG)(mktime(tm) - year_start) / 60;
 765     TRACE("bias: %d\n", tzi->Bias);
 766
 767     tmp = find_dst_change(year_start, year_end, &is_dst);
 768     if (is_dst)
 769         dlt = tmp;
 770     else
 771         std = tmp;
 772
 773     tmp = find_dst_change(tmp, year_end, &is_dst);
 774     if (is_dst)
 775         dlt = tmp;
 776     else
 777         std = tmp;
 778
 779     TRACE("std: %s", ctime(&std));
 780     TRACE("dlt: %s", ctime(&dlt));
 781
 782     if (dlt == std || !dlt || !std)
 783     {
 784         TRACE("there is no daylight saving rules in this time zone\n");
 785         return;
 786     }
 787
 788     tmp = dlt - tzi->Bias * 60;
 789     tm = gmtime(&tmp);
 790     TRACE("dlt gmtime: %s", asctime(tm));
 791
 792     tzi->DaylightBias = -60;
 793     tzi->DaylightDate.wYear = tm->tm_year + 1900;
 794     tzi->DaylightDate.wMonth = tm->tm_mon + 1;
 795     tzi->DaylightDate.wDayOfWeek = tm->tm_wday;
 796     tzi->DaylightDate.wDay = tm->tm_mday;
 797     tzi->DaylightDate.wHour = tm->tm_hour;
 798     tzi->DaylightDate.wMinute = tm->tm_min;
 799     tzi->DaylightDate.wSecond = tm->tm_sec;
 800     tzi->DaylightDate.wMilliseconds = 0;
 801
 802     TRACE("daylight (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 803         tzi->DaylightDate.wDay, tzi->DaylightDate.wMonth,
 804         tzi->DaylightDate.wYear, tzi->DaylightDate.wDayOfWeek,
 805         tzi->DaylightDate.wHour, tzi->DaylightDate.wMinute,
 806         tzi->DaylightDate.wSecond, tzi->DaylightDate.wMilliseconds,
 807         tzi->DaylightBias);
 808
 809     tmp = std - tzi->Bias * 60 - tzi->DaylightBias * 60;
 810     tm = gmtime(&tmp);
 811     TRACE("std gmtime: %s", asctime(tm));
 812
 813     tzi->StandardBias = 0;
 814     tzi->StandardDate.wYear = tm->tm_year + 1900;
 815     tzi->StandardDate.wMonth = tm->tm_mon + 1;
 816     tzi->StandardDate.wDayOfWeek = tm->tm_wday;
 817     tzi->StandardDate.wDay = tm->tm_mday;
 818     tzi->StandardDate.wHour = tm->tm_hour;
 819     tzi->StandardDate.wMinute = tm->tm_min;
 820     tzi->StandardDate.wSecond = tm->tm_sec;
 821     tzi->StandardDate.wMilliseconds = 0;
 822
 823     TRACE("standard (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 824         tzi->StandardDate.wDay, tzi->StandardDate.wMonth,
 825         tzi->StandardDate.wYear, tzi->StandardDate.wDayOfWeek,
 826         tzi->StandardDate.wHour, tzi->StandardDate.wMinute,
 827         tzi->StandardDate.wSecond, tzi->StandardDate.wMilliseconds,
 828         tzi->StandardBias);
 829
 830     find_reg_tz_info(tzi);
 831 }
 832
 833 /***********************************************************************
 834  *      RtlQueryTimeZoneInformation [NTDLL.@]
 835  *
 836  * Get information about the current timezone.
 837  *
 838  * PARAMS
 839  *   tzinfo [O] Destination for the retrieved timezone info.
 840  *
 841  * RETURNS
 842  *   Success: STATUS_SUCCESS.
 843  *   Failure: An NTSTATUS error code indicating the problem.
 844  */
 845 NTSTATUS WINAPI RtlQueryTimeZoneInformation(RTL_TIME_ZONE_INFORMATION *tzinfo)
 846 {
 847     static RTL_TIME_ZONE_INFORMATION *cached_tzi;
 848     static int current_year = -1;
 849
 850     RtlEnterCriticalSection(&TIME_tz_section);
 851
 852     if (!cached_tzi)
 853         cached_tzi = RtlAllocateHeap(GetProcessHeap(), 0, sizeof(*cached_tzi));
 854
 855     init_tz_info(cached_tzi, &current_year);
 856     *tzinfo = *cached_tzi;
 857
 858     RtlLeaveCriticalSection(&TIME_tz_section);
 859
 860     return STATUS_SUCCESS;
 861 }
 862
 863 /***********************************************************************
 864  *       RtlSetTimeZoneInformation [NTDLL.@]
 865  *
 866  * Set the current time zone information.
 867  *
 868  * PARAMS
 869  *   tzinfo [I] Timezone information to set.
 870  *
 871  * RETURNS
 872  *   Success: STATUS_SUCCESS.
 873  *   Failure: An NTSTATUS error code indicating the problem.
 874  *
 875  */
 876 NTSTATUS WINAPI RtlSetTimeZoneInformation( const RTL_TIME_ZONE_INFORMATION *tzinfo )
 877 {
 878     return STATUS_PRIVILEGE_NOT_HELD;
 879 }
 880
 881 /***********************************************************************
 882  *        NtSetSystemTime [NTDLL.@]
 883  *        ZwSetSystemTime [NTDLL.@]
 884  *
 885  * Set the system time.
 886  *
 887  * PARAMS
 888  *   NewTime [I] The time to set.
 889  *   OldTime [O] Optional destination for the previous system time.
 890  *
 891  * RETURNS
 892  *   Success: STATUS_SUCCESS.
 893  *   Failure: An NTSTATUS error code indicating the problem.
 894  */
 895 NTSTATUS WINAPI NtSetSystemTime(const LARGE_INTEGER *NewTime, LARGE_INTEGER *OldTime)
 896 {
 897     TIME_FIELDS tf;
 898     struct timeval tv;
 899     struct timezone tz;
 900     struct tm t;
 901     time_t sec, oldsec;
 902     int dst, bias;
 903     int err;
 904
 905     /* Return the old time if necessary */
 906     if(OldTime)
 907         NtQuerySystemTime(OldTime);
 908
 909     RtlTimeToTimeFields(NewTime, &tf);
 910
 911     /* call gettimeofday to get the current timezone */
 912     gettimeofday(&tv, &tz);
 913     oldsec = tv.tv_sec;
 914     /* get delta local time from utc */
 915     bias = TIME_GetBias(oldsec, &dst);
 916
 917     /* get the number of seconds */
 918     t.tm_sec = tf.Second;
 919     t.tm_min = tf.Minute;
 920     t.tm_hour = tf.Hour;
 921     t.tm_mday = tf.Day;
 922     t.tm_mon = tf.Month - 1;
 923     t.tm_year = tf.Year - 1900;
 924     t.tm_isdst = dst;
 925     sec = mktime (&t);
 926     /* correct for timezone and daylight */
 927     sec += bias;
 928
 929     /* set the new time */
 930     tv.tv_sec = sec;
 931     tv.tv_usec = tf.Milliseconds * 1000;
 932
 933     /* error and sanity check*/
 934     if(sec == (time_t)-1 || abs((int)(sec-oldsec)) > SETTIME_MAX_ADJUST) {
 935         err = 2;
 936     } else {
 937 #ifdef HAVE_SETTIMEOFDAY
 938         err = settimeofday(&tv, NULL); /* 0 is OK, -1 is error */
 939         if(err == 0)
 940             return STATUS_SUCCESS;
 941 #else
 942         err = 1;
 943 #endif
 944     }
 945
 946     ERR("Cannot set time to %d/%d/%d %d:%d:%d Time adjustment %ld %s\n",
 947             tf.Year, tf.Month, tf.Day, tf.Hour, tf.Minute, tf.Second,
 948             (long)(sec-oldsec),
 949             err == -1 ? "No Permission"
 950                       : sec == (time_t)-1 ? "" : "is too large." );
 951
 952     if(err == 2)
 953         return STATUS_INVALID_PARAMETER;
 954     else if(err == -1)
 955         return STATUS_PRIVILEGE_NOT_HELD;
 956     else
 957         return STATUS_NOT_IMPLEMENTED;
 958 }