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 int init_tz_info(RTL_TIME_ZONE_INFORMATION *tzi);
  55
  56 static RTL_CRITICAL_SECTION TIME_tz_section;
  57 static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
  58 {
  59     0, 0, &TIME_tz_section,
  60     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  61       0, 0, { (DWORD_PTR)(__FILE__ ": TIME_tz_section") }
  62 };
  63 static RTL_CRITICAL_SECTION TIME_tz_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  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 LONG TIME_GetBias(void)
 243 {
 244     static time_t last_utc;
 245     static LONG last_bias;
 246     LONG ret;
 247     time_t utc;
 248
 249     utc = time( NULL );
 250
 251     RtlEnterCriticalSection( &TIME_tz_section );
 252     if (utc != last_utc)
 253     {
 254         RTL_TIME_ZONE_INFORMATION tzi;
 255         int is_dst = init_tz_info( &tzi );
 256
 257         last_utc = utc;
 258         last_bias = tzi.Bias;
 259         last_bias += is_dst ? tzi.DaylightBias : tzi.StandardBias;
 260         last_bias *= SECSPERMIN;
 261     }
 262
 263     ret = last_bias;
 264
 265     RtlLeaveCriticalSection( &TIME_tz_section );
 266     return ret;
 267 }
 268
 269 /******************************************************************************
 270  *        RtlLocalTimeToSystemTime [NTDLL.@]
 271  *
 272  * Convert a local time into system time.
 273  *
 274  * PARAMS
 275  *   LocalTime  [I] Local time to convert.
 276  *   SystemTime [O] Destination for the converted time.
 277  *
 278  * RETURNS
 279  *   Success: STATUS_SUCCESS.
 280  *   Failure: An NTSTATUS error code indicating the problem.
 281  */
 282 NTSTATUS WINAPI RtlLocalTimeToSystemTime( const LARGE_INTEGER *LocalTime,
 283                                           PLARGE_INTEGER SystemTime)
 284 {
 285     LONG bias;
 286
 287     TRACE("(%p, %p)\n", LocalTime, SystemTime);
 288
 289     bias = TIME_GetBias();
 290     SystemTime->QuadPart = LocalTime->QuadPart + bias * (LONGLONG)TICKSPERSEC;
 291     return STATUS_SUCCESS;
 292 }
 293
 294 /******************************************************************************
 295  *       RtlSystemTimeToLocalTime [NTDLL.@]
 296  *
 297  * Convert a system time into a local time.
 298  *
 299  * PARAMS
 300  *   SystemTime [I] System time to convert.
 301  *   LocalTime  [O] Destination for the converted time.
 302  *
 303  * RETURNS
 304  *   Success: STATUS_SUCCESS.
 305  *   Failure: An NTSTATUS error code indicating the problem.
 306  */
 307 NTSTATUS WINAPI RtlSystemTimeToLocalTime( const LARGE_INTEGER *SystemTime,
 308                                           PLARGE_INTEGER LocalTime )
 309 {
 310     LONG bias;
 311
 312     TRACE("(%p, %p)\n", SystemTime, LocalTime);
 313
 314     bias = TIME_GetBias();
 315     LocalTime->QuadPart = SystemTime->QuadPart - bias * (LONGLONG)TICKSPERSEC;
 316     return STATUS_SUCCESS;
 317 }
 318
 319 /******************************************************************************
 320  *       RtlTimeToSecondsSince1970 [NTDLL.@]
 321  *
 322  * Convert a time into a count of seconds since 1970.
 323  *
 324  * PARAMS
 325  *   Time    [I] Time to convert.
 326  *   Seconds [O] Destination for the converted time.
 327  *
 328  * RETURNS
 329  *   Success: TRUE.
 330  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 331  */
 332 BOOLEAN WINAPI RtlTimeToSecondsSince1970( const LARGE_INTEGER *Time, LPDWORD Seconds )
 333 {
 334     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 335     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 336     tmp -= SECS_1601_TO_1970;
 337     if (tmp > 0xffffffff) return FALSE;
 338     *Seconds = (DWORD)tmp;
 339     return TRUE;
 340 }
 341
 342 /******************************************************************************
 343  *       RtlTimeToSecondsSince1980 [NTDLL.@]
 344  *
 345  * Convert a time into a count of seconds since 1980.
 346  *
 347  * PARAMS
 348  *   Time    [I] Time to convert.
 349  *   Seconds [O] Destination for the converted time.
 350  *
 351  * RETURNS
 352  *   Success: TRUE.
 353  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 354  */
 355 BOOLEAN WINAPI RtlTimeToSecondsSince1980( const LARGE_INTEGER *Time, LPDWORD Seconds )
 356 {
 357     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 358     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 359     tmp -= SECS_1601_TO_1980;
 360     if (tmp > 0xffffffff) return FALSE;
 361     *Seconds = (DWORD)tmp;
 362     return TRUE;
 363 }
 364
 365 /******************************************************************************
 366  *       RtlSecondsSince1970ToTime [NTDLL.@]
 367  *
 368  * Convert a count of seconds since 1970 to a time.
 369  *
 370  * PARAMS
 371  *   Seconds [I] Time to convert.
 372  *   Time    [O] Destination for the converted time.
 373  *
 374  * RETURNS
 375  *   Nothing.
 376  */
 377 void WINAPI RtlSecondsSince1970ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 378 {
 379     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 380     Time->u.LowPart  = (DWORD)secs;
 381     Time->u.HighPart = (DWORD)(secs >> 32);
 382 }
 383
 384 /******************************************************************************
 385  *       RtlSecondsSince1980ToTime [NTDLL.@]
 386  *
 387  * Convert a count of seconds since 1980 to a time.
 388  *
 389  * PARAMS
 390  *   Seconds [I] Time to convert.
 391  *   Time    [O] Destination for the converted time.
 392  *
 393  * RETURNS
 394  *   Nothing.
 395  */
 396 void WINAPI RtlSecondsSince1980ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 397 {
 398     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1980;
 399     Time->u.LowPart  = (DWORD)secs;
 400     Time->u.HighPart = (DWORD)(secs >> 32);
 401 }
 402
 403 /******************************************************************************
 404  *       RtlTimeToElapsedTimeFields [NTDLL.@]
 405  *
 406  * Convert a time to a count of elapsed seconds.
 407  *
 408  * PARAMS
 409  *   Time       [I] Time to convert.
 410  *   TimeFields [O] Destination for the converted time.
 411  *
 412  * RETURNS
 413  *   Nothing.
 414  */
 415 void WINAPI RtlTimeToElapsedTimeFields( const LARGE_INTEGER *Time, PTIME_FIELDS TimeFields )
 416 {
 417     LONGLONG time;
 418     INT rem;
 419
 420     time = RtlExtendedLargeIntegerDivide( Time->QuadPart, TICKSPERSEC, &rem );
 421     TimeFields->Milliseconds = rem / TICKSPERMSEC;
 422
 423     /* time is now in seconds */
 424     TimeFields->Year  = 0;
 425     TimeFields->Month = 0;
 426     TimeFields->Day   = RtlExtendedLargeIntegerDivide( time, SECSPERDAY, &rem );
 427
 428     /* rem is now the remaining seconds in the last day */
 429     TimeFields->Second = rem % 60;
 430     rem /= 60;
 431     TimeFields->Minute = rem % 60;
 432     TimeFields->Hour = rem / 60;
 433 }
 434
 435 /***********************************************************************
 436  *       NtQuerySystemTime [NTDLL.@]
 437  *       ZwQuerySystemTime [NTDLL.@]
 438  *
 439  * Get the current system time.
 440  *
 441  * PARAMS
 442  *   Time [O] Destination for the current system time.
 443  *
 444  * RETURNS
 445  *   Success: STATUS_SUCCESS.
 446  *   Failure: An NTSTATUS error code indicating the problem.
 447  */
 448 NTSTATUS WINAPI NtQuerySystemTime( PLARGE_INTEGER Time )
 449 {
 450     struct timeval now;
 451
 452     gettimeofday( &now, 0 );
 453     Time->QuadPart = now.tv_sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 454     Time->QuadPart += now.tv_usec * 10;
 455     return STATUS_SUCCESS;
 456 }
 457
 458 /******************************************************************************
 459  *  NtQueryPerformanceCounter   [NTDLL.@]
 460  *
 461  *  Note: Windows uses a timer clocked at a multiple of 1193182 Hz. There is a
 462  *  good number of applications that crash when the returned frequency is either
 463  *  lower or higher than what Windows gives. Also too high counter values are
 464  *  reported to give problems.
 465  */
 466 NTSTATUS WINAPI NtQueryPerformanceCounter( PLARGE_INTEGER Counter, PLARGE_INTEGER Frequency )
 467 {
 468     LARGE_INTEGER now;
 469
 470     if (!Counter) return STATUS_ACCESS_VIOLATION;
 471
 472     /* convert a counter that increments at a rate of 10 MHz
 473      * to one of 1.193182 MHz, with some care for arithmetic
 474      * overflow and good accuracy (21/176 = 0.11931818) */
 475     NtQuerySystemTime( &now );
 476     Counter->QuadPart = ((now.QuadPart - server_start_time) * 21) / 176;
 477     if (Frequency) Frequency->QuadPart = 1193182;
 478     return STATUS_SUCCESS;
 479 }
 480
 481
 482 /******************************************************************************
 483  * NtGetTickCount   (NTDLL.@)
 484  * ZwGetTickCount   (NTDLL.@)
 485  */
 486 ULONG WINAPI NtGetTickCount(void)
 487 {
 488     LARGE_INTEGER now;
 489
 490     NtQuerySystemTime( &now );
 491     return (now.QuadPart - server_start_time) / 10000;
 492 }
 493
 494 /* calculate the mday of dst change date, so that for instance Sun 5 Oct 2007
 495  * (last Sunday in October of 2007) becomes Sun Oct 28 2007
 496  *
 497  * Note: year, day and month must be in unix format.
 498  */
 499 static int weekday_to_mday(int year, int day, int mon, int day_of_week)
 500 {
 501     struct tm date;
 502     time_t tmp;
 503     int wday, mday;
 504
 505     /* find first day in the month matching week day of the date */
 506     memset(&date, 0, sizeof(date));
 507     date.tm_year = year;
 508     date.tm_mon = mon;
 509     date.tm_mday = -1;
 510     date.tm_wday = -1;
 511     do
 512     {
 513         date.tm_mday++;
 514         tmp = mktime(&date);
 515     } while (date.tm_wday != day_of_week || date.tm_mon != mon);
 516
 517     mday = date.tm_mday;
 518
 519     /* find number of week days in the month matching week day of the date */
 520     wday = 1; /* 1 - 1st, ...., 5 - last */
 521     while (wday < day)
 522     {
 523         struct tm *tm;
 524
 525         date.tm_mday += 7;
 526         tmp = mktime(&date);
 527         tm = localtime(&tmp);
 528         if (tm->tm_mon != mon)
 529             break;
 530         mday = tm->tm_mday;
 531         wday++;
 532     }
 533
 534     return mday;
 535 }
 536
 537 static BOOL match_tz_date(const RTL_SYSTEM_TIME *st, const RTL_SYSTEM_TIME *reg_st)
 538 {
 539     WORD wDay;
 540
 541     if (st->wMonth != reg_st->wMonth) return FALSE;
 542
 543     if (!st->wMonth) return TRUE; /* no transition dates */
 544
 545     wDay = reg_st->wDay;
 546     if (!reg_st->wYear) /* date in a day-of-week format */
 547         wDay = weekday_to_mday(st->wYear - 1900, reg_st->wDay, reg_st->wMonth - 1, reg_st->wDayOfWeek);
 548
 549     if (st->wDay != wDay ||
 550         st->wHour != reg_st->wHour ||
 551         st->wMinute != reg_st->wMinute ||
 552         st->wSecond != reg_st->wSecond ||
 553         st->wMilliseconds != reg_st->wMilliseconds) return FALSE;
 554
 555     return TRUE;
 556 }
 557
 558 static BOOL match_tz_info(const RTL_TIME_ZONE_INFORMATION *tzi, const RTL_TIME_ZONE_INFORMATION *reg_tzi)
 559 {
 560     if (tzi->Bias == reg_tzi->Bias &&
 561         match_tz_date(&tzi->StandardDate, &reg_tzi->StandardDate) &&
 562         match_tz_date(&tzi->DaylightDate, &reg_tzi->DaylightDate))
 563         return TRUE;
 564
 565     return FALSE;
 566 }
 567
 568 static BOOL reg_query_value(HKEY hkey, LPCWSTR name, DWORD type, void *data, DWORD count)
 569 {
 570     UNICODE_STRING nameW;
 571     char buf[256];
 572     KEY_VALUE_PARTIAL_INFORMATION *info = (KEY_VALUE_PARTIAL_INFORMATION *)buf;
 573
 574     if (count > sizeof(buf) - sizeof(KEY_VALUE_PARTIAL_INFORMATION))
 575         return FALSE;
 576
 577     RtlInitUnicodeString(&nameW, name);
 578
 579     if (NtQueryValueKey(hkey, &nameW, KeyValuePartialInformation,
 580                         buf, sizeof(buf), &count))
 581         return FALSE;
 582
 583     if (info->Type != type) return FALSE;
 584
 585     memcpy(data, info->Data, info->DataLength);
 586     return TRUE;
 587 }
 588
 589 static void find_reg_tz_info(RTL_TIME_ZONE_INFORMATION *tzi)
 590 {
 591     static const WCHAR Time_ZonesW[] = { 'M','a','c','h','i','n','e','\\',
 592         'S','o','f','t','w','a','r','e','\\',
 593         'M','i','c','r','o','s','o','f','t','\\',
 594         'W','i','n','d','o','w','s',' ','N','T','\\',
 595         'C','u','r','r','e','n','t','V','e','r','s','i','o','n','\\',
 596         'T','i','m','e',' ','Z','o','n','e','s',0 };
 597     HANDLE hkey;
 598     ULONG idx;
 599     OBJECT_ATTRIBUTES attr;
 600     UNICODE_STRING nameW;
 601     WCHAR buf[128];
 602
 603     attr.Length = sizeof(attr);
 604     attr.RootDirectory = 0;
 605     attr.ObjectName = &nameW;
 606     attr.Attributes = 0;
 607     attr.SecurityDescriptor = NULL;
 608     attr.SecurityQualityOfService = NULL;
 609     RtlInitUnicodeString(&nameW, Time_ZonesW);
 610     if (NtOpenKey(&hkey, KEY_READ, &attr))
 611     {
 612         WARN("Unable to open the time zones key\n");
 613         return;
 614     }
 615
 616     idx = 0;
 617     nameW.Buffer = buf;
 618     nameW.Length = sizeof(buf);
 619     nameW.MaximumLength = sizeof(buf);
 620
 621     while (!RtlpNtEnumerateSubKey(hkey, &nameW, idx++))
 622     {
 623         static const WCHAR stdW[] = { 'S','t','d',0 };
 624         static const WCHAR dltW[] = { 'D','l','t',0 };
 625         static const WCHAR tziW[] = { 'T','Z','I',0 };
 626         RTL_TIME_ZONE_INFORMATION reg_tzi;
 627         HANDLE hSubkey;
 628         struct tz_reg_data
 629         {
 630             LONG bias;
 631             LONG std_bias;
 632             LONG dlt_bias;
 633             RTL_SYSTEM_TIME std_date;
 634             RTL_SYSTEM_TIME dlt_date;
 635         } tz_data;
 636
 637         attr.Length = sizeof(attr);
 638         attr.RootDirectory = hkey;
 639         attr.ObjectName = &nameW;
 640         attr.Attributes = 0;
 641         attr.SecurityDescriptor = NULL;
 642         attr.SecurityQualityOfService = NULL;
 643         if (NtOpenKey(&hSubkey, KEY_READ, &attr))
 644         {
 645             WARN("Unable to open subkey %s\n", debugstr_wn(nameW.Buffer, nameW.Length/sizeof(WCHAR)));
 646             continue;
 647         }
 648
 649 #define get_value(hkey, name, type, data, len) \
 650     if (!reg_query_value(hkey, name, type, data, len)) \
 651     { \
 652         WARN("can't read data from %s\n", debugstr_w(name)); \
 653         NtClose(hkey); \
 654         continue; \
 655     }
 656
 657         get_value(hSubkey, stdW, REG_SZ, reg_tzi.StandardName, sizeof(reg_tzi.StandardName));
 658         get_value(hSubkey, dltW, REG_SZ, reg_tzi.DaylightName, sizeof(reg_tzi.DaylightName));
 659         get_value(hSubkey, tziW, REG_BINARY, &tz_data, sizeof(tz_data));
 660
 661 #undef get_value
 662
 663         reg_tzi.Bias = tz_data.bias;
 664         reg_tzi.StandardBias = tz_data.std_bias;
 665         reg_tzi.DaylightBias = tz_data.dlt_bias;
 666         reg_tzi.StandardDate = tz_data.std_date;
 667         reg_tzi.DaylightDate = tz_data.dlt_date;
 668
 669         TRACE("%s: bias %d\n", debugstr_wn(nameW.Buffer, nameW.Length/sizeof(WCHAR)), reg_tzi.Bias);
 670         TRACE("std (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 671             reg_tzi.StandardDate.wDay, reg_tzi.StandardDate.wMonth,
 672             reg_tzi.StandardDate.wYear, reg_tzi.StandardDate.wDayOfWeek,
 673             reg_tzi.StandardDate.wHour, reg_tzi.StandardDate.wMinute,
 674             reg_tzi.StandardDate.wSecond, reg_tzi.StandardDate.wMilliseconds,
 675             reg_tzi.StandardBias);
 676         TRACE("dst (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 677             reg_tzi.DaylightDate.wDay, reg_tzi.DaylightDate.wMonth,
 678             reg_tzi.DaylightDate.wYear, reg_tzi.DaylightDate.wDayOfWeek,
 679             reg_tzi.DaylightDate.wHour, reg_tzi.DaylightDate.wMinute,
 680             reg_tzi.DaylightDate.wSecond, reg_tzi.DaylightDate.wMilliseconds,
 681             reg_tzi.DaylightBias);
 682
 683         NtClose(hSubkey);
 684
 685         if (match_tz_info(tzi, &reg_tzi))
 686         {
 687             memcpy(tzi, &reg_tzi, sizeof(*tzi));
 688             NtClose(hkey);
 689             return;
 690         }
 691
 692         /* reset len */
 693         nameW.Length = sizeof(buf);
 694         nameW.MaximumLength = sizeof(buf);
 695     }
 696
 697     NtClose(hkey);
 698
 699     FIXME("Can't find matching timezone information in the registry for "
 700           "bias %d, std (d/m/y): %u/%02u/%04u, dlt (d/m/y): %u/%02u/%04u\n",
 701           tzi->Bias,
 702           tzi->StandardDate.wDay, tzi->StandardDate.wMonth, tzi->StandardDate.wYear,
 703           tzi->DaylightDate.wDay, tzi->DaylightDate.wMonth, tzi->DaylightDate.wYear);
 704 }
 705
 706 static time_t find_dst_change(unsigned long min, unsigned long max, int *is_dst)
 707 {
 708     time_t start;
 709     struct tm *tm;
 710
 711     start = min;
 712     tm = localtime(&start);
 713     *is_dst = !tm->tm_isdst;
 714     TRACE("starting date isdst %d, %s", !*is_dst, ctime(&start));
 715
 716     while (min <= max)
 717     {
 718         time_t pos = (min + max) / 2;
 719         tm = localtime(&pos);
 720
 721         if (tm->tm_isdst != *is_dst)
 722             min = pos + 1;
 723         else
 724             max = pos - 1;
 725     }
 726     return min;
 727 }
 728
 729 static int init_tz_info(RTL_TIME_ZONE_INFORMATION *tzi)
 730 {
 731     static RTL_TIME_ZONE_INFORMATION cached_tzi;
 732     static int current_year = -1;
 733     struct tm *tm;
 734     time_t year_start, year_end, tmp, dlt = 0, std = 0;
 735     int is_dst, current_is_dst;
 736
 737     RtlEnterCriticalSection( &TIME_tz_section );
 738
 739     year_start = time(NULL);
 740     tm = localtime(&year_start);
 741
 742     current_is_dst = tm->tm_isdst;
 743     if (current_year == tm->tm_year)
 744     {
 745         *tzi = cached_tzi;
 746         RtlLeaveCriticalSection( &TIME_tz_section );
 747         return current_is_dst;
 748     }
 749
 750     memset(tzi, 0, sizeof(*tzi));
 751
 752     TRACE("tz data will be valid through year %d\n", tm->tm_year + 1900);
 753     current_year = tm->tm_year;
 754
 755     tm->tm_isdst = 0;
 756     tm->tm_mday = 1;
 757     tm->tm_mon = tm->tm_hour = tm->tm_min = tm->tm_sec = tm->tm_wday = tm->tm_yday = 0;
 758     year_start = mktime(tm);
 759     TRACE("year_start: %s", ctime(&year_start));
 760
 761     tm->tm_mday = tm->tm_wday = tm->tm_yday = 0;
 762     tm->tm_mon = 12;
 763     tm->tm_hour = 23;
 764     tm->tm_min = tm->tm_sec = 59;
 765     year_end = mktime(tm);
 766     TRACE("year_end: %s", ctime(&year_end));
 767
 768     tm = gmtime(&year_start);
 769     tzi->Bias = (LONG)(mktime(tm) - year_start) / 60;
 770     TRACE("bias: %d\n", tzi->Bias);
 771
 772     tmp = find_dst_change(year_start, year_end, &is_dst);
 773     if (is_dst)
 774         dlt = tmp;
 775     else
 776         std = tmp;
 777
 778     tmp = find_dst_change(tmp, year_end, &is_dst);
 779     if (is_dst)
 780         dlt = tmp;
 781     else
 782         std = tmp;
 783
 784     TRACE("std: %s", ctime(&std));
 785     TRACE("dlt: %s", ctime(&dlt));
 786
 787     if (dlt == std || !dlt || !std)
 788         TRACE("there is no daylight saving rules in this time zone\n");
 789     else
 790     {
 791         tmp = dlt - tzi->Bias * 60;
 792         tm = gmtime(&tmp);
 793         TRACE("dlt gmtime: %s", asctime(tm));
 794
 795         tzi->DaylightBias = -60;
 796         tzi->DaylightDate.wYear = tm->tm_year + 1900;
 797         tzi->DaylightDate.wMonth = tm->tm_mon + 1;
 798         tzi->DaylightDate.wDayOfWeek = tm->tm_wday;
 799         tzi->DaylightDate.wDay = tm->tm_mday;
 800         tzi->DaylightDate.wHour = tm->tm_hour;
 801         tzi->DaylightDate.wMinute = tm->tm_min;
 802         tzi->DaylightDate.wSecond = tm->tm_sec;
 803         tzi->DaylightDate.wMilliseconds = 0;
 804
 805         TRACE("daylight (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 806             tzi->DaylightDate.wDay, tzi->DaylightDate.wMonth,
 807             tzi->DaylightDate.wYear, tzi->DaylightDate.wDayOfWeek,
 808             tzi->DaylightDate.wHour, tzi->DaylightDate.wMinute,
 809             tzi->DaylightDate.wSecond, tzi->DaylightDate.wMilliseconds,
 810             tzi->DaylightBias);
 811
 812         tmp = std - tzi->Bias * 60 - tzi->DaylightBias * 60;
 813         tm = gmtime(&tmp);
 814         TRACE("std gmtime: %s", asctime(tm));
 815
 816         tzi->StandardBias = 0;
 817         tzi->StandardDate.wYear = tm->tm_year + 1900;
 818         tzi->StandardDate.wMonth = tm->tm_mon + 1;
 819         tzi->StandardDate.wDayOfWeek = tm->tm_wday;
 820         tzi->StandardDate.wDay = tm->tm_mday;
 821         tzi->StandardDate.wHour = tm->tm_hour;
 822         tzi->StandardDate.wMinute = tm->tm_min;
 823         tzi->StandardDate.wSecond = tm->tm_sec;
 824         tzi->StandardDate.wMilliseconds = 0;
 825
 826         TRACE("standard (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 827             tzi->StandardDate.wDay, tzi->StandardDate.wMonth,
 828             tzi->StandardDate.wYear, tzi->StandardDate.wDayOfWeek,
 829             tzi->StandardDate.wHour, tzi->StandardDate.wMinute,
 830             tzi->StandardDate.wSecond, tzi->StandardDate.wMilliseconds,
 831             tzi->StandardBias);
 832     }
 833
 834     find_reg_tz_info(tzi);
 835     cached_tzi = *tzi;
 836
 837     RtlLeaveCriticalSection( &TIME_tz_section );
 838
 839     return current_is_dst;
 840 }
 841
 842 /***********************************************************************
 843  *      RtlQueryTimeZoneInformation [NTDLL.@]
 844  *
 845  * Get information about the current timezone.
 846  *
 847  * PARAMS
 848  *   tzinfo [O] Destination for the retrieved timezone info.
 849  *
 850  * RETURNS
 851  *   Success: STATUS_SUCCESS.
 852  *   Failure: An NTSTATUS error code indicating the problem.
 853  */
 854 NTSTATUS WINAPI RtlQueryTimeZoneInformation(RTL_TIME_ZONE_INFORMATION *tzinfo)
 855 {
 856     init_tz_info( tzinfo );
 857
 858     return STATUS_SUCCESS;
 859 }
 860
 861 /***********************************************************************
 862  *       RtlSetTimeZoneInformation [NTDLL.@]
 863  *
 864  * Set the current time zone information.
 865  *
 866  * PARAMS
 867  *   tzinfo [I] Timezone information to set.
 868  *
 869  * RETURNS
 870  *   Success: STATUS_SUCCESS.
 871  *   Failure: An NTSTATUS error code indicating the problem.
 872  *
 873  */
 874 NTSTATUS WINAPI RtlSetTimeZoneInformation( const RTL_TIME_ZONE_INFORMATION *tzinfo )
 875 {
 876     return STATUS_PRIVILEGE_NOT_HELD;
 877 }
 878
 879 /***********************************************************************
 880  *        NtSetSystemTime [NTDLL.@]
 881  *        ZwSetSystemTime [NTDLL.@]
 882  *
 883  * Set the system time.
 884  *
 885  * PARAMS
 886  *   NewTime [I] The time to set.
 887  *   OldTime [O] Optional destination for the previous system time.
 888  *
 889  * RETURNS
 890  *   Success: STATUS_SUCCESS.
 891  *   Failure: An NTSTATUS error code indicating the problem.
 892  */
 893 NTSTATUS WINAPI NtSetSystemTime(const LARGE_INTEGER *NewTime, LARGE_INTEGER *OldTime)
 894 {
 895     struct timeval tv;
 896     time_t tm_t;
 897     DWORD sec, oldsec;
 898     LARGE_INTEGER tm;
 899
 900     /* Return the old time if necessary */
 901     if (!OldTime) OldTime = &tm;
 902
 903     NtQuerySystemTime( OldTime );
 904     RtlTimeToSecondsSince1970( OldTime, &oldsec );
 905
 906     RtlTimeToSecondsSince1970( NewTime, &sec );
 907
 908     /* set the new time */
 909     tv.tv_sec = sec;
 910     tv.tv_usec = 0;
 911
 912 #ifdef HAVE_SETTIMEOFDAY
 913     if (!settimeofday(&tv, NULL)) /* 0 is OK, -1 is error */
 914         return STATUS_SUCCESS;
 915     tm_t = sec;
 916     ERR("Cannot set time to %s, time adjustment %ld: %s\n",
 917         ctime(&tm_t), (long)(sec-oldsec), strerror(errno));
 918     if (errno == EPERM)
 919         return STATUS_PRIVILEGE_NOT_HELD;
 920     else
 921         return STATUS_INVALID_PARAMETER;
 922 #else
 923     tm_t = sec;
 924     FIXME("setting time to %s not implemented for missing settimeofday\n",
 925         ctime(&tm_t));
 926     return STATUS_NOT_IMPLEMENTED;
 927 #endif
 928 }