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 #ifdef __APPLE__
  42 # include <mach/mach_time.h>
  43 #endif
  44
  45 #include "ntstatus.h"
  46 #define WIN32_NO_STATUS
  47 #include "windef.h"
  48 #include "winternl.h"
  49 #include "wine/unicode.h"
  50 #include "wine/debug.h"
  51 #include "ntdll_misc.h"
  52
  53 WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
  54
  55 static int init_tz_info(RTL_DYNAMIC_TIME_ZONE_INFORMATION *tzi);
  56
  57 static RTL_CRITICAL_SECTION TIME_tz_section;
  58 static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
  59 {
  60     0, 0, &TIME_tz_section,
  61     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  62       0, 0, { (DWORD_PTR)(__FILE__ ": TIME_tz_section") }
  63 };
  64 static RTL_CRITICAL_SECTION TIME_tz_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  65
  66 #define TICKSPERSEC        10000000
  67 #define TICKSPERMSEC       10000
  68 #define SECSPERDAY         86400
  69 #define SECSPERHOUR        3600
  70 #define SECSPERMIN         60
  71 #define MINSPERHOUR        60
  72 #define HOURSPERDAY        24
  73 #define EPOCHWEEKDAY       1  /* Jan 1, 1601 was Monday */
  74 #define DAYSPERWEEK        7
  75 #define MONSPERYEAR        12
  76 #define DAYSPERQUADRICENTENNIUM (365 * 400 + 97)
  77 #define DAYSPERNORMALQUADRENNIUM (365 * 4 + 1)
  78
  79 /* 1601 to 1970 is 369 years plus 89 leap days */
  80 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
  81 #define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
  82 /* 1601 to 1980 is 379 years plus 91 leap days */
  83 #define SECS_1601_TO_1980  ((379 * 365 + 91) * (ULONGLONG)SECSPERDAY)
  84 #define TICKS_1601_TO_1980 (SECS_1601_TO_1980 * TICKSPERSEC)
  85
  86
  87 static const int MonthLengths[2][MONSPERYEAR] =
  88 {
  89         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
  90         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
  91 };
  92
  93 static inline BOOL IsLeapYear(int Year)
  94 {
  95     return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0);
  96 }
  97
  98 /* return a monotonic time counter, in Win32 ticks */
  99 static ULONGLONG monotonic_counter(void)
 100 {
 101     struct timeval now;
 102
 103 #ifdef HAVE_CLOCK_GETTIME
 104     struct timespec ts;
 105 #ifdef CLOCK_MONOTONIC_RAW
 106     if (!clock_gettime( CLOCK_MONOTONIC_RAW, &ts ))
 107         return ts.tv_sec * (ULONGLONG)TICKSPERSEC + ts.tv_nsec / 100;
 108 #endif
 109     if (!clock_gettime( CLOCK_MONOTONIC, &ts ))
 110         return ts.tv_sec * (ULONGLONG)TICKSPERSEC + ts.tv_nsec / 100;
 111 #elif defined(__APPLE__)
 112     static mach_timebase_info_data_t timebase;
 113
 114     if (!timebase.denom) mach_timebase_info( &timebase );
 115     return mach_absolute_time() * timebase.numer / timebase.denom / 100;
 116 #endif
 117
 118     gettimeofday( &now, 0 );
 119     return now.tv_sec * (ULONGLONG)TICKSPERSEC + now.tv_usec * 10 + TICKS_1601_TO_1970 - server_start_time;
 120 }
 121
 122 /******************************************************************************
 123  *       RtlTimeToTimeFields [NTDLL.@]
 124  *
 125  * Convert a time into a TIME_FIELDS structure.
 126  *
 127  * PARAMS
 128  *   liTime     [I] Time to convert.
 129  *   TimeFields [O] Destination for the converted time.
 130  *
 131  * RETURNS
 132  *   Nothing.
 133  */
 134 VOID WINAPI RtlTimeToTimeFields(
 135         const LARGE_INTEGER *liTime,
 136         PTIME_FIELDS TimeFields)
 137 {
 138         int SecondsInDay;
 139         long int cleaps, years, yearday, months;
 140         long int Days;
 141         LONGLONG Time;
 142
 143         /* Extract millisecond from time and convert time into seconds */
 144         TimeFields->Milliseconds =
 145             (CSHORT) (( liTime->QuadPart % TICKSPERSEC) / TICKSPERMSEC);
 146         Time = liTime->QuadPart / TICKSPERSEC;
 147
 148         /* The native version of RtlTimeToTimeFields does not take leap seconds
 149          * into account */
 150
 151         /* Split the time into days and seconds within the day */
 152         Days = Time / SECSPERDAY;
 153         SecondsInDay = Time % SECSPERDAY;
 154
 155         /* compute time of day */
 156         TimeFields->Hour = (CSHORT) (SecondsInDay / SECSPERHOUR);
 157         SecondsInDay = SecondsInDay % SECSPERHOUR;
 158         TimeFields->Minute = (CSHORT) (SecondsInDay / SECSPERMIN);
 159         TimeFields->Second = (CSHORT) (SecondsInDay % SECSPERMIN);
 160
 161         /* compute day of week */
 162         TimeFields->Weekday = (CSHORT) ((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
 163
 164         /* compute year, month and day of month. */
 165         cleaps=( 3 * ((4 * Days + 1227) / DAYSPERQUADRICENTENNIUM) + 3 ) / 4;
 166         Days += 28188 + cleaps;
 167         years = (20 * Days - 2442) / (5 * DAYSPERNORMALQUADRENNIUM);
 168         yearday = Days - (years * DAYSPERNORMALQUADRENNIUM)/4;
 169         months = (64 * yearday) / 1959;
 170         /* the result is based on a year starting on March.
 171          * To convert take 12 from Januari and Februari and
 172          * increase the year by one. */
 173         if( months < 14 ) {
 174             TimeFields->Month = months - 1;
 175             TimeFields->Year = years + 1524;
 176         } else {
 177             TimeFields->Month = months - 13;
 178             TimeFields->Year = years + 1525;
 179         }
 180         /* calculation of day of month is based on the wonderful
 181          * sequence of INT( n * 30.6): it reproduces the
 182          * 31-30-31-30-31-31 month lengths exactly for small n's */
 183         TimeFields->Day = yearday - (1959 * months) / 64 ;
 184         return;
 185 }
 186
 187 /******************************************************************************
 188  *       RtlTimeFieldsToTime [NTDLL.@]
 189  *
 190  * Convert a TIME_FIELDS structure into a time.
 191  *
 192  * PARAMS
 193  *   ftTimeFields [I] TIME_FIELDS structure to convert.
 194  *   Time         [O] Destination for the converted time.
 195  *
 196  * RETURNS
 197  *   Success: TRUE.
 198  *   Failure: FALSE.
 199  */
 200 BOOLEAN WINAPI RtlTimeFieldsToTime(
 201         PTIME_FIELDS tfTimeFields,
 202         PLARGE_INTEGER Time)
 203 {
 204         int month, year, cleaps, day;
 205
 206         /* FIXME: normalize the TIME_FIELDS structure here */
 207         /* No, native just returns 0 (error) if the fields are not */
 208         if( tfTimeFields->Milliseconds< 0 || tfTimeFields->Milliseconds > 999 ||
 209                 tfTimeFields->Second < 0 || tfTimeFields->Second > 59 ||
 210                 tfTimeFields->Minute < 0 || tfTimeFields->Minute > 59 ||
 211                 tfTimeFields->Hour < 0 || tfTimeFields->Hour > 23 ||
 212                 tfTimeFields->Month < 1 || tfTimeFields->Month > 12 ||
 213                 tfTimeFields->Day < 1 ||
 214                 tfTimeFields->Day > MonthLengths
 215                     [ tfTimeFields->Month ==2 || IsLeapYear(tfTimeFields->Year)]
 216                     [ tfTimeFields->Month - 1] ||
 217                 tfTimeFields->Year < 1601 )
 218             return FALSE;
 219
 220         /* now calculate a day count from the date
 221          * First start counting years from March. This way the leap days
 222          * are added at the end of the year, not somewhere in the middle.
 223          * Formula's become so much less complicate that way.
 224          * To convert: add 12 to the month numbers of Jan and Feb, and
 225          * take 1 from the year */
 226         if(tfTimeFields->Month < 3) {
 227             month = tfTimeFields->Month + 13;
 228             year = tfTimeFields->Year - 1;
 229         } else {
 230             month = tfTimeFields->Month + 1;
 231             year = tfTimeFields->Year;
 232         }
 233         cleaps = (3 * (year / 100) + 3) / 4;   /* nr of "century leap years"*/
 234         day =  (36525 * year) / 100 - cleaps + /* year * dayperyr, corrected */
 235                  (1959 * month) / 64 +         /* months * daypermonth */
 236                  tfTimeFields->Day -          /* day of the month */
 237                  584817 ;                      /* zero that on 1601-01-01 */
 238         /* done */
 239
 240         Time->QuadPart = (((((LONGLONG) day * HOURSPERDAY +
 241             tfTimeFields->Hour) * MINSPERHOUR +
 242             tfTimeFields->Minute) * SECSPERMIN +
 243             tfTimeFields->Second ) * 1000 +
 244             tfTimeFields->Milliseconds ) * TICKSPERMSEC;
 245
 246         return TRUE;
 247 }
 248
 249 /***********************************************************************
 250  *       TIME_GetBias [internal]
 251  *
 252  * Helper function calculates delta local time from UTC.
 253  *
 254  * PARAMS
 255  *   utc [I] The current utc time.
 256  *   pdaylight [I] Local daylight.
 257  *
 258  * RETURNS
 259  *   The bias for the current timezone.
 260  */
 261 static LONG TIME_GetBias(void)
 262 {
 263     static time_t last_utc;
 264     static LONG last_bias;
 265     LONG ret;
 266     time_t utc;
 267
 268     utc = time( NULL );
 269
 270     RtlEnterCriticalSection( &TIME_tz_section );
 271     if (utc != last_utc)
 272     {
 273         RTL_DYNAMIC_TIME_ZONE_INFORMATION tzi;
 274         int is_dst = init_tz_info( &tzi );
 275
 276         last_utc = utc;
 277         last_bias = tzi.Bias;
 278         last_bias += is_dst ? tzi.DaylightBias : tzi.StandardBias;
 279         last_bias *= SECSPERMIN;
 280     }
 281
 282     ret = last_bias;
 283
 284     RtlLeaveCriticalSection( &TIME_tz_section );
 285     return ret;
 286 }
 287
 288 /******************************************************************************
 289  *        RtlLocalTimeToSystemTime [NTDLL.@]
 290  *
 291  * Convert a local time into system time.
 292  *
 293  * PARAMS
 294  *   LocalTime  [I] Local time to convert.
 295  *   SystemTime [O] Destination for the converted time.
 296  *
 297  * RETURNS
 298  *   Success: STATUS_SUCCESS.
 299  *   Failure: An NTSTATUS error code indicating the problem.
 300  */
 301 NTSTATUS WINAPI RtlLocalTimeToSystemTime( const LARGE_INTEGER *LocalTime,
 302                                           PLARGE_INTEGER SystemTime)
 303 {
 304     LONG bias;
 305
 306     TRACE("(%p, %p)\n", LocalTime, SystemTime);
 307
 308     bias = TIME_GetBias();
 309     SystemTime->QuadPart = LocalTime->QuadPart + bias * (LONGLONG)TICKSPERSEC;
 310     return STATUS_SUCCESS;
 311 }
 312
 313 /******************************************************************************
 314  *       RtlSystemTimeToLocalTime [NTDLL.@]
 315  *
 316  * Convert a system time into a local time.
 317  *
 318  * PARAMS
 319  *   SystemTime [I] System time to convert.
 320  *   LocalTime  [O] Destination for the converted time.
 321  *
 322  * RETURNS
 323  *   Success: STATUS_SUCCESS.
 324  *   Failure: An NTSTATUS error code indicating the problem.
 325  */
 326 NTSTATUS WINAPI RtlSystemTimeToLocalTime( const LARGE_INTEGER *SystemTime,
 327                                           PLARGE_INTEGER LocalTime )
 328 {
 329     LONG bias;
 330
 331     TRACE("(%p, %p)\n", SystemTime, LocalTime);
 332
 333     bias = TIME_GetBias();
 334     LocalTime->QuadPart = SystemTime->QuadPart - bias * (LONGLONG)TICKSPERSEC;
 335     return STATUS_SUCCESS;
 336 }
 337
 338 /******************************************************************************
 339  *       RtlTimeToSecondsSince1970 [NTDLL.@]
 340  *
 341  * Convert a time into a count of seconds since 1970.
 342  *
 343  * PARAMS
 344  *   Time    [I] Time to convert.
 345  *   Seconds [O] Destination for the converted time.
 346  *
 347  * RETURNS
 348  *   Success: TRUE.
 349  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 350  */
 351 BOOLEAN WINAPI RtlTimeToSecondsSince1970( const LARGE_INTEGER *Time, LPDWORD Seconds )
 352 {
 353     ULONGLONG tmp = Time->QuadPart / TICKSPERSEC - SECS_1601_TO_1970;
 354     if (tmp > 0xffffffff) return FALSE;
 355     *Seconds = tmp;
 356     return TRUE;
 357 }
 358
 359 /******************************************************************************
 360  *       RtlTimeToSecondsSince1980 [NTDLL.@]
 361  *
 362  * Convert a time into a count of seconds since 1980.
 363  *
 364  * PARAMS
 365  *   Time    [I] Time to convert.
 366  *   Seconds [O] Destination for the converted time.
 367  *
 368  * RETURNS
 369  *   Success: TRUE.
 370  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 371  */
 372 BOOLEAN WINAPI RtlTimeToSecondsSince1980( const LARGE_INTEGER *Time, LPDWORD Seconds )
 373 {
 374     ULONGLONG tmp = Time->QuadPart / TICKSPERSEC - SECS_1601_TO_1980;
 375     if (tmp > 0xffffffff) return FALSE;
 376     *Seconds = tmp;
 377     return TRUE;
 378 }
 379
 380 /******************************************************************************
 381  *       RtlSecondsSince1970ToTime [NTDLL.@]
 382  *
 383  * Convert a count of seconds since 1970 to a time.
 384  *
 385  * PARAMS
 386  *   Seconds [I] Time to convert.
 387  *   Time    [O] Destination for the converted time.
 388  *
 389  * RETURNS
 390  *   Nothing.
 391  */
 392 void WINAPI RtlSecondsSince1970ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 393 {
 394     Time->QuadPart = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 395 }
 396
 397 /******************************************************************************
 398  *       RtlSecondsSince1980ToTime [NTDLL.@]
 399  *
 400  * Convert a count of seconds since 1980 to a time.
 401  *
 402  * PARAMS
 403  *   Seconds [I] Time to convert.
 404  *   Time    [O] Destination for the converted time.
 405  *
 406  * RETURNS
 407  *   Nothing.
 408  */
 409 void WINAPI RtlSecondsSince1980ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 410 {
 411     Time->QuadPart = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1980;
 412 }
 413
 414 /******************************************************************************
 415  *       RtlTimeToElapsedTimeFields [NTDLL.@]
 416  *
 417  * Convert a time to a count of elapsed seconds.
 418  *
 419  * PARAMS
 420  *   Time       [I] Time to convert.
 421  *   TimeFields [O] Destination for the converted time.
 422  *
 423  * RETURNS
 424  *   Nothing.
 425  */
 426 void WINAPI RtlTimeToElapsedTimeFields( const LARGE_INTEGER *Time, PTIME_FIELDS TimeFields )
 427 {
 428     LONGLONG time;
 429     INT rem;
 430
 431     time = Time->QuadPart / TICKSPERSEC;
 432     TimeFields->Milliseconds = (Time->QuadPart % TICKSPERSEC) / TICKSPERMSEC;
 433
 434     /* time is now in seconds */
 435     TimeFields->Year  = 0;
 436     TimeFields->Month = 0;
 437     TimeFields->Day   = time / SECSPERDAY;
 438
 439     /* rem is now the remaining seconds in the last day */
 440     rem = time % SECSPERDAY;
 441     TimeFields->Second = rem % 60;
 442     rem /= 60;
 443     TimeFields->Minute = rem % 60;
 444     TimeFields->Hour = rem / 60;
 445 }
 446
 447 /***********************************************************************
 448  *       NtQuerySystemTime [NTDLL.@]
 449  *       ZwQuerySystemTime [NTDLL.@]
 450  *
 451  * Get the current system time.
 452  *
 453  * PARAMS
 454  *   Time [O] Destination for the current system time.
 455  *
 456  * RETURNS
 457  *   Success: STATUS_SUCCESS.
 458  *   Failure: An NTSTATUS error code indicating the problem.
 459  */
 460 NTSTATUS WINAPI NtQuerySystemTime( PLARGE_INTEGER Time )
 461 {
 462     struct timeval now;
 463
 464     gettimeofday( &now, 0 );
 465     Time->QuadPart = now.tv_sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 466     Time->QuadPart += now.tv_usec * 10;
 467     return STATUS_SUCCESS;
 468 }
 469
 470 /******************************************************************************
 471  *  NtQueryPerformanceCounter   [NTDLL.@]
 472  */
 473 NTSTATUS WINAPI NtQueryPerformanceCounter( LARGE_INTEGER *counter, LARGE_INTEGER *frequency )
 474 {
 475     if (!counter) return STATUS_ACCESS_VIOLATION;
 476
 477     counter->QuadPart = monotonic_counter();
 478     if (frequency) frequency->QuadPart = TICKSPERSEC;
 479     return STATUS_SUCCESS;
 480 }
 481
 482
 483 /******************************************************************************
 484  * NtGetTickCount   (NTDLL.@)
 485  * ZwGetTickCount   (NTDLL.@)
 486  */
 487 ULONG WINAPI NtGetTickCount(void)
 488 {
 489     return monotonic_counter() / TICKSPERMSEC;
 490 }
 491
 492 /* calculate the mday of dst change date, so that for instance Sun 5 Oct 2007
 493  * (last Sunday in October of 2007) becomes Sun Oct 28 2007
 494  *
 495  * Note: year, day and month must be in unix format.
 496  */
 497 static int weekday_to_mday(int year, int day, int mon, int day_of_week)
 498 {
 499     struct tm date;
 500     time_t tmp;
 501     int wday, mday;
 502
 503     /* find first day in the month matching week day of the date */
 504     memset(&date, 0, sizeof(date));
 505     date.tm_year = year;
 506     date.tm_mon = mon;
 507     date.tm_mday = -1;
 508     date.tm_wday = -1;
 509     do
 510     {
 511         date.tm_mday++;
 512         tmp = mktime(&date);
 513     } while (date.tm_wday != day_of_week || date.tm_mon != mon);
 514
 515     mday = date.tm_mday;
 516
 517     /* find number of week days in the month matching week day of the date */
 518     wday = 1; /* 1 - 1st, ...., 5 - last */
 519     while (wday < day)
 520     {
 521         struct tm *tm;
 522
 523         date.tm_mday += 7;
 524         tmp = mktime(&date);
 525         tm = localtime(&tmp);
 526         if (tm->tm_mon != mon)
 527             break;
 528         mday = tm->tm_mday;
 529         wday++;
 530     }
 531
 532     return mday;
 533 }
 534
 535 static BOOL match_tz_date(const RTL_SYSTEM_TIME *st, const RTL_SYSTEM_TIME *reg_st)
 536 {
 537     WORD wDay;
 538
 539     if (st->wMonth != reg_st->wMonth) return FALSE;
 540
 541     if (!st->wMonth) return TRUE; /* no transition dates */
 542
 543     wDay = reg_st->wDay;
 544     if (!reg_st->wYear) /* date in a day-of-week format */
 545         wDay = weekday_to_mday(st->wYear - 1900, reg_st->wDay, reg_st->wMonth - 1, reg_st->wDayOfWeek);
 546
 547     if (st->wDay != wDay ||
 548         st->wHour != reg_st->wHour ||
 549         st->wMinute != reg_st->wMinute ||
 550         st->wSecond != reg_st->wSecond ||
 551         st->wMilliseconds != reg_st->wMilliseconds) return FALSE;
 552
 553     return TRUE;
 554 }
 555
 556 static BOOL match_tz_info(const RTL_DYNAMIC_TIME_ZONE_INFORMATION *tzi, const RTL_DYNAMIC_TIME_ZONE_INFORMATION *reg_tzi)
 557 {
 558     if (tzi->Bias == reg_tzi->Bias &&
 559         match_tz_date(&tzi->StandardDate, &reg_tzi->StandardDate) &&
 560         match_tz_date(&tzi->DaylightDate, &reg_tzi->DaylightDate))
 561         return TRUE;
 562
 563     return FALSE;
 564 }
 565
 566 static BOOL reg_query_value(HKEY hkey, LPCWSTR name, DWORD type, void *data, DWORD count)
 567 {
 568     UNICODE_STRING nameW;
 569     char buf[256];
 570     KEY_VALUE_PARTIAL_INFORMATION *info = (KEY_VALUE_PARTIAL_INFORMATION *)buf;
 571
 572     if (count > sizeof(buf) - sizeof(KEY_VALUE_PARTIAL_INFORMATION))
 573         return FALSE;
 574
 575     RtlInitUnicodeString(&nameW, name);
 576
 577     if (NtQueryValueKey(hkey, &nameW, KeyValuePartialInformation,
 578                         buf, sizeof(buf), &count))
 579         return FALSE;
 580
 581     if (info->Type != type) return FALSE;
 582
 583     memcpy(data, info->Data, info->DataLength);
 584     return TRUE;
 585 }
 586
 587 static void find_reg_tz_info(RTL_DYNAMIC_TIME_ZONE_INFORMATION *tzi, int year)
 588 {
 589     static const WCHAR Time_ZonesW[] = { 'M','a','c','h','i','n','e','\\',
 590         'S','o','f','t','w','a','r','e','\\',
 591         'M','i','c','r','o','s','o','f','t','\\',
 592         'W','i','n','d','o','w','s',' ','N','T','\\',
 593         'C','u','r','r','e','n','t','V','e','r','s','i','o','n','\\',
 594         'T','i','m','e',' ','Z','o','n','e','s',0 };
 595     static const WCHAR Dynamic_DstW[] = { 'D','y','n','a','m','i','c',' ','D','S','T',0 };
 596     static const WCHAR fmtW[] = { '%','d',0 };
 597     HANDLE hkey;
 598     ULONG idx;
 599     OBJECT_ATTRIBUTES attr, attrDynamic;
 600     UNICODE_STRING nameW, nameDynamicW;
 601     WCHAR buf[128], yearW[16];
 602
 603     sprintfW(yearW, fmtW, year);
 604
 605     attrDynamic.Length = sizeof(attrDynamic);
 606     attrDynamic.RootDirectory = 0; /* will be replaced later */
 607     attrDynamic.ObjectName = &nameDynamicW;
 608     attrDynamic.Attributes = 0;
 609     attrDynamic.SecurityDescriptor = NULL;
 610     attrDynamic.SecurityQualityOfService = NULL;
 611     RtlInitUnicodeString(&nameDynamicW, Dynamic_DstW);
 612
 613     attr.Length = sizeof(attr);
 614     attr.RootDirectory = 0;
 615     attr.ObjectName = &nameW;
 616     attr.Attributes = 0;
 617     attr.SecurityDescriptor = NULL;
 618     attr.SecurityQualityOfService = NULL;
 619     RtlInitUnicodeString(&nameW, Time_ZonesW);
 620     if (NtOpenKey(&hkey, KEY_READ, &attr))
 621     {
 622         WARN("Unable to open the time zones key\n");
 623         return;
 624     }
 625
 626     idx = 0;
 627     nameW.Buffer = buf;
 628     nameW.Length = sizeof(buf);
 629     nameW.MaximumLength = sizeof(buf);
 630
 631     while (!RtlpNtEnumerateSubKey(hkey, &nameW, idx++))
 632     {
 633         static const WCHAR stdW[] = { 'S','t','d',0 };
 634         static const WCHAR dltW[] = { 'D','l','t',0 };
 635         static const WCHAR tziW[] = { 'T','Z','I',0 };
 636         RTL_DYNAMIC_TIME_ZONE_INFORMATION reg_tzi;
 637         HANDLE hSubkey, hSubkeyDynamicDST;
 638         BOOL is_dynamic = FALSE;
 639
 640         struct tz_reg_data
 641         {
 642             LONG bias;
 643             LONG std_bias;
 644             LONG dlt_bias;
 645             RTL_SYSTEM_TIME std_date;
 646             RTL_SYSTEM_TIME dlt_date;
 647         } tz_data;
 648
 649         attr.Length = sizeof(attr);
 650         attr.RootDirectory = hkey;
 651         attr.ObjectName = &nameW;
 652         attr.Attributes = 0;
 653         attr.SecurityDescriptor = NULL;
 654         attr.SecurityQualityOfService = NULL;
 655         if (NtOpenKey(&hSubkey, KEY_READ, &attr))
 656         {
 657             WARN("Unable to open subkey %s\n", debugstr_wn(nameW.Buffer, nameW.Length/sizeof(WCHAR)));
 658             continue;
 659         }
 660
 661 #define get_value(hkey, name, type, data, len) \
 662     if (!reg_query_value(hkey, name, type, data, len)) \
 663     { \
 664         WARN("can't read data from %s\n", debugstr_w(name)); \
 665         NtClose(hkey); \
 666         continue; \
 667     }
 668
 669         get_value(hSubkey, stdW, REG_SZ, reg_tzi.StandardName, sizeof(reg_tzi.StandardName));
 670         get_value(hSubkey, dltW, REG_SZ, reg_tzi.DaylightName, sizeof(reg_tzi.DaylightName));
 671         memcpy(reg_tzi.TimeZoneKeyName, nameW.Buffer, nameW.Length);
 672         reg_tzi.TimeZoneKeyName[nameW.Length/sizeof(WCHAR)] = 0;
 673
 674         /* Check for Dynamic DST entry first */
 675         attrDynamic.RootDirectory = hSubkey;
 676         if (!NtOpenKey(&hSubkeyDynamicDST, KEY_READ, &attrDynamic))
 677         {
 678             is_dynamic = reg_query_value(hSubkeyDynamicDST, yearW, REG_BINARY, &tz_data, sizeof(tz_data));
 679             NtClose(hSubkeyDynamicDST);
 680         }
 681
 682         if (!is_dynamic)
 683             get_value(hSubkey, tziW, REG_BINARY, &tz_data, sizeof(tz_data));
 684
 685 #undef get_value
 686
 687         reg_tzi.Bias = tz_data.bias;
 688         reg_tzi.StandardBias = tz_data.std_bias;
 689         reg_tzi.DaylightBias = tz_data.dlt_bias;
 690         reg_tzi.StandardDate = tz_data.std_date;
 691         reg_tzi.DaylightDate = tz_data.dlt_date;
 692
 693         TRACE("%s: bias %d\n", debugstr_wn(nameW.Buffer, nameW.Length/sizeof(WCHAR)), reg_tzi.Bias);
 694         TRACE("std (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 695             reg_tzi.StandardDate.wDay, reg_tzi.StandardDate.wMonth,
 696             reg_tzi.StandardDate.wYear, reg_tzi.StandardDate.wDayOfWeek,
 697             reg_tzi.StandardDate.wHour, reg_tzi.StandardDate.wMinute,
 698             reg_tzi.StandardDate.wSecond, reg_tzi.StandardDate.wMilliseconds,
 699             reg_tzi.StandardBias);
 700         TRACE("dst (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 701             reg_tzi.DaylightDate.wDay, reg_tzi.DaylightDate.wMonth,
 702             reg_tzi.DaylightDate.wYear, reg_tzi.DaylightDate.wDayOfWeek,
 703             reg_tzi.DaylightDate.wHour, reg_tzi.DaylightDate.wMinute,
 704             reg_tzi.DaylightDate.wSecond, reg_tzi.DaylightDate.wMilliseconds,
 705             reg_tzi.DaylightBias);
 706
 707         NtClose(hSubkey);
 708
 709         if (match_tz_info(tzi, &reg_tzi))
 710         {
 711             *tzi = reg_tzi;
 712             NtClose(hkey);
 713             return;
 714         }
 715
 716         /* reset len */
 717         nameW.Length = sizeof(buf);
 718         nameW.MaximumLength = sizeof(buf);
 719     }
 720
 721     NtClose(hkey);
 722
 723     FIXME("Can't find matching timezone information in the registry for "
 724           "bias %d, std (d/m/y): %u/%02u/%04u, dlt (d/m/y): %u/%02u/%04u\n",
 725           tzi->Bias,
 726           tzi->StandardDate.wDay, tzi->StandardDate.wMonth, tzi->StandardDate.wYear,
 727           tzi->DaylightDate.wDay, tzi->DaylightDate.wMonth, tzi->DaylightDate.wYear);
 728 }
 729
 730 static time_t find_dst_change(unsigned long min, unsigned long max, int *is_dst)
 731 {
 732     time_t start;
 733     struct tm *tm;
 734
 735     start = min;
 736     tm = localtime(&start);
 737     *is_dst = !tm->tm_isdst;
 738     TRACE("starting date isdst %d, %s", !*is_dst, ctime(&start));
 739
 740     while (min <= max)
 741     {
 742         time_t pos = (min + max) / 2;
 743         tm = localtime(&pos);
 744
 745         if (tm->tm_isdst != *is_dst)
 746             min = pos + 1;
 747         else
 748             max = pos - 1;
 749     }
 750     return min;
 751 }
 752
 753 static int init_tz_info(RTL_DYNAMIC_TIME_ZONE_INFORMATION *tzi)
 754 {
 755     static RTL_DYNAMIC_TIME_ZONE_INFORMATION cached_tzi;
 756     static int current_year = -1, current_bias = 65535;
 757     struct tm *tm;
 758     time_t year_start, year_end, tmp, dlt = 0, std = 0;
 759     int is_dst, current_is_dst, bias;
 760
 761     RtlEnterCriticalSection( &TIME_tz_section );
 762
 763     year_start = time(NULL);
 764     tm = gmtime(&year_start);
 765     bias = (LONG)(mktime(tm) - year_start) / 60;
 766
 767     tm = localtime(&year_start);
 768     current_is_dst = tm->tm_isdst;
 769     if (current_year == tm->tm_year && current_bias == bias)
 770     {
 771         *tzi = cached_tzi;
 772         RtlLeaveCriticalSection( &TIME_tz_section );
 773         return current_is_dst;
 774     }
 775
 776     memset(tzi, 0, sizeof(*tzi));
 777
 778     TRACE("tz data will be valid through year %d, bias %d\n", tm->tm_year + 1900, bias);
 779     current_year = tm->tm_year;
 780     current_bias = bias;
 781
 782     tzi->Bias = bias;
 783
 784     tm->tm_isdst = 0;
 785     tm->tm_mday = 1;
 786     tm->tm_mon = tm->tm_hour = tm->tm_min = tm->tm_sec = tm->tm_wday = tm->tm_yday = 0;
 787     year_start = mktime(tm);
 788     TRACE("year_start: %s", ctime(&year_start));
 789
 790     tm->tm_mday = tm->tm_wday = tm->tm_yday = 0;
 791     tm->tm_mon = 12;
 792     tm->tm_hour = 23;
 793     tm->tm_min = tm->tm_sec = 59;
 794     year_end = mktime(tm);
 795     TRACE("year_end: %s", ctime(&year_end));
 796
 797     tmp = find_dst_change(year_start, year_end, &is_dst);
 798     if (is_dst)
 799         dlt = tmp;
 800     else
 801         std = tmp;
 802
 803     tmp = find_dst_change(tmp, year_end, &is_dst);
 804     if (is_dst)
 805         dlt = tmp;
 806     else
 807         std = tmp;
 808
 809     TRACE("std: %s", ctime(&std));
 810     TRACE("dlt: %s", ctime(&dlt));
 811
 812     if (dlt == std || !dlt || !std)
 813         TRACE("there is no daylight saving rules in this time zone\n");
 814     else
 815     {
 816         tmp = dlt - tzi->Bias * 60;
 817         tm = gmtime(&tmp);
 818         TRACE("dlt gmtime: %s", asctime(tm));
 819
 820         tzi->DaylightBias = -60;
 821         tzi->DaylightDate.wYear = tm->tm_year + 1900;
 822         tzi->DaylightDate.wMonth = tm->tm_mon + 1;
 823         tzi->DaylightDate.wDayOfWeek = tm->tm_wday;
 824         tzi->DaylightDate.wDay = tm->tm_mday;
 825         tzi->DaylightDate.wHour = tm->tm_hour;
 826         tzi->DaylightDate.wMinute = tm->tm_min;
 827         tzi->DaylightDate.wSecond = tm->tm_sec;
 828         tzi->DaylightDate.wMilliseconds = 0;
 829
 830         TRACE("daylight (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 831             tzi->DaylightDate.wDay, tzi->DaylightDate.wMonth,
 832             tzi->DaylightDate.wYear, tzi->DaylightDate.wDayOfWeek,
 833             tzi->DaylightDate.wHour, tzi->DaylightDate.wMinute,
 834             tzi->DaylightDate.wSecond, tzi->DaylightDate.wMilliseconds,
 835             tzi->DaylightBias);
 836
 837         tmp = std - tzi->Bias * 60 - tzi->DaylightBias * 60;
 838         tm = gmtime(&tmp);
 839         TRACE("std gmtime: %s", asctime(tm));
 840
 841         tzi->StandardBias = 0;
 842         tzi->StandardDate.wYear = tm->tm_year + 1900;
 843         tzi->StandardDate.wMonth = tm->tm_mon + 1;
 844         tzi->StandardDate.wDayOfWeek = tm->tm_wday;
 845         tzi->StandardDate.wDay = tm->tm_mday;
 846         tzi->StandardDate.wHour = tm->tm_hour;
 847         tzi->StandardDate.wMinute = tm->tm_min;
 848         tzi->StandardDate.wSecond = tm->tm_sec;
 849         tzi->StandardDate.wMilliseconds = 0;
 850
 851         TRACE("standard (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 852             tzi->StandardDate.wDay, tzi->StandardDate.wMonth,
 853             tzi->StandardDate.wYear, tzi->StandardDate.wDayOfWeek,
 854             tzi->StandardDate.wHour, tzi->StandardDate.wMinute,
 855             tzi->StandardDate.wSecond, tzi->StandardDate.wMilliseconds,
 856             tzi->StandardBias);
 857     }
 858
 859     find_reg_tz_info(tzi, current_year + 1900);
 860     cached_tzi = *tzi;
 861
 862     RtlLeaveCriticalSection( &TIME_tz_section );
 863
 864     return current_is_dst;
 865 }
 866
 867 /***********************************************************************
 868  *      RtlQueryTimeZoneInformation [NTDLL.@]
 869  *
 870  * Get information about the current timezone.
 871  *
 872  * PARAMS
 873  *   tzinfo [O] Destination for the retrieved timezone info.
 874  *
 875  * RETURNS
 876  *   Success: STATUS_SUCCESS.
 877  *   Failure: An NTSTATUS error code indicating the problem.
 878  */
 879 NTSTATUS WINAPI RtlQueryTimeZoneInformation(RTL_TIME_ZONE_INFORMATION *ret)
 880 {
 881     RTL_DYNAMIC_TIME_ZONE_INFORMATION tzinfo;
 882
 883     init_tz_info( &tzinfo );
 884     memcpy( ret, &tzinfo, sizeof(*ret) );
 885     return STATUS_SUCCESS;
 886 }
 887
 888 /***********************************************************************
 889  *      RtlQueryDynamicTimeZoneInformation [NTDLL.@]
 890  *
 891  * Get information about the current timezone.
 892  *
 893  * PARAMS
 894  *   tzinfo [O] Destination for the retrieved timezone info.
 895  *
 896  * RETURNS
 897  *   Success: STATUS_SUCCESS.
 898  *   Failure: An NTSTATUS error code indicating the problem.
 899  */
 900 NTSTATUS WINAPI RtlQueryDynamicTimeZoneInformation(RTL_DYNAMIC_TIME_ZONE_INFORMATION *tzinfo)
 901 {
 902     init_tz_info( tzinfo );
 903
 904     return STATUS_SUCCESS;
 905 }
 906
 907 /***********************************************************************
 908  *       RtlSetTimeZoneInformation [NTDLL.@]
 909  *
 910  * Set the current time zone information.
 911  *
 912  * PARAMS
 913  *   tzinfo [I] Timezone information to set.
 914  *
 915  * RETURNS
 916  *   Success: STATUS_SUCCESS.
 917  *   Failure: An NTSTATUS error code indicating the problem.
 918  *
 919  */
 920 NTSTATUS WINAPI RtlSetTimeZoneInformation( const RTL_TIME_ZONE_INFORMATION *tzinfo )
 921 {
 922     return STATUS_PRIVILEGE_NOT_HELD;
 923 }
 924
 925 /***********************************************************************
 926  *        NtSetSystemTime [NTDLL.@]
 927  *        ZwSetSystemTime [NTDLL.@]
 928  *
 929  * Set the system time.
 930  *
 931  * PARAMS
 932  *   NewTime [I] The time to set.
 933  *   OldTime [O] Optional destination for the previous system time.
 934  *
 935  * RETURNS
 936  *   Success: STATUS_SUCCESS.
 937  *   Failure: An NTSTATUS error code indicating the problem.
 938  */
 939 NTSTATUS WINAPI NtSetSystemTime(const LARGE_INTEGER *NewTime, LARGE_INTEGER *OldTime)
 940 {
 941     struct timeval tv;
 942     time_t tm_t;
 943     DWORD sec, oldsec;
 944     LARGE_INTEGER tm;
 945
 946     /* Return the old time if necessary */
 947     if (!OldTime) OldTime = &tm;
 948
 949     NtQuerySystemTime( OldTime );
 950     RtlTimeToSecondsSince1970( OldTime, &oldsec );
 951
 952     RtlTimeToSecondsSince1970( NewTime, &sec );
 953
 954     /* set the new time */
 955     tv.tv_sec = sec;
 956     tv.tv_usec = 0;
 957
 958 #ifdef HAVE_SETTIMEOFDAY
 959     if (!settimeofday(&tv, NULL)) /* 0 is OK, -1 is error */
 960         return STATUS_SUCCESS;
 961     tm_t = sec;
 962     ERR("Cannot set time to %s, time adjustment %ld: %s\n",
 963         ctime(&tm_t), (long)(sec-oldsec), strerror(errno));
 964     if (errno == EPERM)
 965         return STATUS_PRIVILEGE_NOT_HELD;
 966     else
 967         return STATUS_INVALID_PARAMETER;
 968 #else
 969     tm_t = sec;
 970     FIXME("setting time to %s not implemented for missing settimeofday\n",
 971         ctime(&tm_t));
 972     return STATUS_NOT_IMPLEMENTED;
 973 #endif
 974 }
 975
 976 /***********************************************************************
 977  *        RtlQueryUnbiasedInterruptTime [NTDLL.@]
 978  */
 979 NTSTATUS WINAPI RtlQueryUnbiasedInterruptTime(ULONGLONG *time)
 980 {
 981     *time = monotonic_counter();
 982     return STATUS_SUCCESS;
 983 }