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 #define NONAMELESSUNION
  46 #define NONAMELESSSTRUCT
  47 #include "ntstatus.h"
  48 #define WIN32_NO_STATUS
  49 #include "windef.h"
  50 #include "winternl.h"
  51 #include "wine/unicode.h"
  52 #include "wine/debug.h"
  53 #include "ntdll_misc.h"
  54
  55 WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
  56
  57 static int init_tz_info(RTL_TIME_ZONE_INFORMATION *tzi);
  58
  59 static RTL_CRITICAL_SECTION TIME_tz_section;
  60 static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
  61 {
  62     0, 0, &TIME_tz_section,
  63     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  64       0, 0, { (DWORD_PTR)(__FILE__ ": TIME_tz_section") }
  65 };
  66 static RTL_CRITICAL_SECTION TIME_tz_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  67
  68 #define TICKSPERSEC        10000000
  69 #define TICKSPERMSEC       10000
  70 #define SECSPERDAY         86400
  71 #define SECSPERHOUR        3600
  72 #define SECSPERMIN         60
  73 #define MINSPERHOUR        60
  74 #define HOURSPERDAY        24
  75 #define EPOCHWEEKDAY       1  /* Jan 1, 1601 was Monday */
  76 #define DAYSPERWEEK        7
  77 #define MONSPERYEAR        12
  78 #define DAYSPERQUADRICENTENNIUM (365 * 400 + 97)
  79 #define DAYSPERNORMALQUADRENNIUM (365 * 4 + 1)
  80
  81 /* 1601 to 1970 is 369 years plus 89 leap days */
  82 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
  83 #define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
  84 /* 1601 to 1980 is 379 years plus 91 leap days */
  85 #define SECS_1601_TO_1980  ((379 * 365 + 91) * (ULONGLONG)SECSPERDAY)
  86 #define TICKS_1601_TO_1980 (SECS_1601_TO_1980 * TICKSPERSEC)
  87
  88
  89 static const int MonthLengths[2][MONSPERYEAR] =
  90 {
  91         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
  92         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
  93 };
  94
  95 static inline BOOL IsLeapYear(int Year)
  96 {
  97     return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0);
  98 }
  99
 100 /* return a monotonic time counter, in Win32 ticks */
 101 static ULONGLONG monotonic_counter(void)
 102 {
 103     struct timeval now;
 104
 105 #ifdef HAVE_CLOCK_GETTIME
 106     struct timespec ts;
 107 #ifdef CLOCK_MONOTONIC_RAW
 108     if (!clock_gettime( CLOCK_MONOTONIC_RAW, &ts ))
 109         return ts.tv_sec * (ULONGLONG)TICKSPERSEC + ts.tv_nsec / 100;
 110 #endif
 111     if (!clock_gettime( CLOCK_MONOTONIC, &ts ))
 112         return ts.tv_sec * (ULONGLONG)TICKSPERSEC + ts.tv_nsec / 100;
 113 #elif defined(__APPLE__)
 114     static mach_timebase_info_data_t timebase;
 115
 116     if (!timebase.denom) mach_timebase_info( &timebase );
 117     return mach_absolute_time() * timebase.numer / timebase.denom / 100;
 118 #endif
 119
 120     gettimeofday( &now, 0 );
 121     return now.tv_sec * (ULONGLONG)TICKSPERSEC + now.tv_usec * 10 + TICKS_1601_TO_1970 - server_start_time;
 122 }
 123
 124 /******************************************************************************
 125  *       RtlTimeToTimeFields [NTDLL.@]
 126  *
 127  * Convert a time into a TIME_FIELDS structure.
 128  *
 129  * PARAMS
 130  *   liTime     [I] Time to convert.
 131  *   TimeFields [O] Destination for the converted time.
 132  *
 133  * RETURNS
 134  *   Nothing.
 135  */
 136 VOID WINAPI RtlTimeToTimeFields(
 137         const LARGE_INTEGER *liTime,
 138         PTIME_FIELDS TimeFields)
 139 {
 140         int SecondsInDay;
 141         long int cleaps, years, yearday, months;
 142         long int Days;
 143         LONGLONG Time;
 144
 145         /* Extract millisecond from time and convert time into seconds */
 146         TimeFields->Milliseconds =
 147             (CSHORT) (( liTime->QuadPart % TICKSPERSEC) / TICKSPERMSEC);
 148         Time = liTime->QuadPart / TICKSPERSEC;
 149
 150         /* The native version of RtlTimeToTimeFields does not take leap seconds
 151          * into account */
 152
 153         /* Split the time into days and seconds within the day */
 154         Days = Time / SECSPERDAY;
 155         SecondsInDay = Time % SECSPERDAY;
 156
 157         /* compute time of day */
 158         TimeFields->Hour = (CSHORT) (SecondsInDay / SECSPERHOUR);
 159         SecondsInDay = SecondsInDay % SECSPERHOUR;
 160         TimeFields->Minute = (CSHORT) (SecondsInDay / SECSPERMIN);
 161         TimeFields->Second = (CSHORT) (SecondsInDay % SECSPERMIN);
 162
 163         /* compute day of week */
 164         TimeFields->Weekday = (CSHORT) ((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
 165
 166         /* compute year, month and day of month. */
 167         cleaps=( 3 * ((4 * Days + 1227) / DAYSPERQUADRICENTENNIUM) + 3 ) / 4;
 168         Days += 28188 + cleaps;
 169         years = (20 * Days - 2442) / (5 * DAYSPERNORMALQUADRENNIUM);
 170         yearday = Days - (years * DAYSPERNORMALQUADRENNIUM)/4;
 171         months = (64 * yearday) / 1959;
 172         /* the result is based on a year starting on March.
 173          * To convert take 12 from Januari and Februari and
 174          * increase the year by one. */
 175         if( months < 14 ) {
 176             TimeFields->Month = months - 1;
 177             TimeFields->Year = years + 1524;
 178         } else {
 179             TimeFields->Month = months - 13;
 180             TimeFields->Year = years + 1525;
 181         }
 182         /* calculation of day of month is based on the wonderful
 183          * sequence of INT( n * 30.6): it reproduces the
 184          * 31-30-31-30-31-31 month lengths exactly for small n's */
 185         TimeFields->Day = yearday - (1959 * months) / 64 ;
 186         return;
 187 }
 188
 189 /******************************************************************************
 190  *       RtlTimeFieldsToTime [NTDLL.@]
 191  *
 192  * Convert a TIME_FIELDS structure into a time.
 193  *
 194  * PARAMS
 195  *   ftTimeFields [I] TIME_FIELDS structure to convert.
 196  *   Time         [O] Destination for the converted time.
 197  *
 198  * RETURNS
 199  *   Success: TRUE.
 200  *   Failure: FALSE.
 201  */
 202 BOOLEAN WINAPI RtlTimeFieldsToTime(
 203         PTIME_FIELDS tfTimeFields,
 204         PLARGE_INTEGER Time)
 205 {
 206         int month, year, cleaps, day;
 207
 208         /* FIXME: normalize the TIME_FIELDS structure here */
 209         /* No, native just returns 0 (error) if the fields are not */
 210         if( tfTimeFields->Milliseconds< 0 || tfTimeFields->Milliseconds > 999 ||
 211                 tfTimeFields->Second < 0 || tfTimeFields->Second > 59 ||
 212                 tfTimeFields->Minute < 0 || tfTimeFields->Minute > 59 ||
 213                 tfTimeFields->Hour < 0 || tfTimeFields->Hour > 23 ||
 214                 tfTimeFields->Month < 1 || tfTimeFields->Month > 12 ||
 215                 tfTimeFields->Day < 1 ||
 216                 tfTimeFields->Day > MonthLengths
 217                     [ tfTimeFields->Month ==2 || IsLeapYear(tfTimeFields->Year)]
 218                     [ tfTimeFields->Month - 1] ||
 219                 tfTimeFields->Year < 1601 )
 220             return FALSE;
 221
 222         /* now calculate a day count from the date
 223          * First start counting years from March. This way the leap days
 224          * are added at the end of the year, not somewhere in the middle.
 225          * Formula's become so much less complicate that way.
 226          * To convert: add 12 to the month numbers of Jan and Feb, and
 227          * take 1 from the year */
 228         if(tfTimeFields->Month < 3) {
 229             month = tfTimeFields->Month + 13;
 230             year = tfTimeFields->Year - 1;
 231         } else {
 232             month = tfTimeFields->Month + 1;
 233             year = tfTimeFields->Year;
 234         }
 235         cleaps = (3 * (year / 100) + 3) / 4;   /* nr of "century leap years"*/
 236         day =  (36525 * year) / 100 - cleaps + /* year * dayperyr, corrected */
 237                  (1959 * month) / 64 +         /* months * daypermonth */
 238                  tfTimeFields->Day -          /* day of the month */
 239                  584817 ;                      /* zero that on 1601-01-01 */
 240         /* done */
 241
 242         Time->QuadPart = (((((LONGLONG) day * HOURSPERDAY +
 243             tfTimeFields->Hour) * MINSPERHOUR +
 244             tfTimeFields->Minute) * SECSPERMIN +
 245             tfTimeFields->Second ) * 1000 +
 246             tfTimeFields->Milliseconds ) * TICKSPERMSEC;
 247
 248         return TRUE;
 249 }
 250
 251 /***********************************************************************
 252  *       TIME_GetBias [internal]
 253  *
 254  * Helper function calculates delta local time from UTC.
 255  *
 256  * PARAMS
 257  *   utc [I] The current utc time.
 258  *   pdaylight [I] Local daylight.
 259  *
 260  * RETURNS
 261  *   The bias for the current timezone.
 262  */
 263 static LONG TIME_GetBias(void)
 264 {
 265     static time_t last_utc;
 266     static LONG last_bias;
 267     LONG ret;
 268     time_t utc;
 269
 270     utc = time( NULL );
 271
 272     RtlEnterCriticalSection( &TIME_tz_section );
 273     if (utc != last_utc)
 274     {
 275         RTL_TIME_ZONE_INFORMATION tzi;
 276         int is_dst = init_tz_info( &tzi );
 277
 278         last_utc = utc;
 279         last_bias = tzi.Bias;
 280         last_bias += is_dst ? tzi.DaylightBias : tzi.StandardBias;
 281         last_bias *= SECSPERMIN;
 282     }
 283
 284     ret = last_bias;
 285
 286     RtlLeaveCriticalSection( &TIME_tz_section );
 287     return ret;
 288 }
 289
 290 /******************************************************************************
 291  *        RtlLocalTimeToSystemTime [NTDLL.@]
 292  *
 293  * Convert a local time into system time.
 294  *
 295  * PARAMS
 296  *   LocalTime  [I] Local time to convert.
 297  *   SystemTime [O] Destination for the converted time.
 298  *
 299  * RETURNS
 300  *   Success: STATUS_SUCCESS.
 301  *   Failure: An NTSTATUS error code indicating the problem.
 302  */
 303 NTSTATUS WINAPI RtlLocalTimeToSystemTime( const LARGE_INTEGER *LocalTime,
 304                                           PLARGE_INTEGER SystemTime)
 305 {
 306     LONG bias;
 307
 308     TRACE("(%p, %p)\n", LocalTime, SystemTime);
 309
 310     bias = TIME_GetBias();
 311     SystemTime->QuadPart = LocalTime->QuadPart + bias * (LONGLONG)TICKSPERSEC;
 312     return STATUS_SUCCESS;
 313 }
 314
 315 /******************************************************************************
 316  *       RtlSystemTimeToLocalTime [NTDLL.@]
 317  *
 318  * Convert a system time into a local time.
 319  *
 320  * PARAMS
 321  *   SystemTime [I] System time to convert.
 322  *   LocalTime  [O] Destination for the converted time.
 323  *
 324  * RETURNS
 325  *   Success: STATUS_SUCCESS.
 326  *   Failure: An NTSTATUS error code indicating the problem.
 327  */
 328 NTSTATUS WINAPI RtlSystemTimeToLocalTime( const LARGE_INTEGER *SystemTime,
 329                                           PLARGE_INTEGER LocalTime )
 330 {
 331     LONG bias;
 332
 333     TRACE("(%p, %p)\n", SystemTime, LocalTime);
 334
 335     bias = TIME_GetBias();
 336     LocalTime->QuadPart = SystemTime->QuadPart - bias * (LONGLONG)TICKSPERSEC;
 337     return STATUS_SUCCESS;
 338 }
 339
 340 /******************************************************************************
 341  *       RtlTimeToSecondsSince1970 [NTDLL.@]
 342  *
 343  * Convert a time into a count of seconds since 1970.
 344  *
 345  * PARAMS
 346  *   Time    [I] Time to convert.
 347  *   Seconds [O] Destination for the converted time.
 348  *
 349  * RETURNS
 350  *   Success: TRUE.
 351  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 352  */
 353 BOOLEAN WINAPI RtlTimeToSecondsSince1970( const LARGE_INTEGER *Time, LPDWORD Seconds )
 354 {
 355     ULONGLONG tmp = Time->QuadPart / TICKSPERSEC - SECS_1601_TO_1970;
 356     if (tmp > 0xffffffff) return FALSE;
 357     *Seconds = tmp;
 358     return TRUE;
 359 }
 360
 361 /******************************************************************************
 362  *       RtlTimeToSecondsSince1980 [NTDLL.@]
 363  *
 364  * Convert a time into a count of seconds since 1980.
 365  *
 366  * PARAMS
 367  *   Time    [I] Time to convert.
 368  *   Seconds [O] Destination for the converted time.
 369  *
 370  * RETURNS
 371  *   Success: TRUE.
 372  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 373  */
 374 BOOLEAN WINAPI RtlTimeToSecondsSince1980( const LARGE_INTEGER *Time, LPDWORD Seconds )
 375 {
 376     ULONGLONG tmp = Time->QuadPart / TICKSPERSEC - SECS_1601_TO_1980;
 377     if (tmp > 0xffffffff) return FALSE;
 378     *Seconds = tmp;
 379     return TRUE;
 380 }
 381
 382 /******************************************************************************
 383  *       RtlSecondsSince1970ToTime [NTDLL.@]
 384  *
 385  * Convert a count of seconds since 1970 to a time.
 386  *
 387  * PARAMS
 388  *   Seconds [I] Time to convert.
 389  *   Time    [O] Destination for the converted time.
 390  *
 391  * RETURNS
 392  *   Nothing.
 393  */
 394 void WINAPI RtlSecondsSince1970ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 395 {
 396     Time->QuadPart = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 397 }
 398
 399 /******************************************************************************
 400  *       RtlSecondsSince1980ToTime [NTDLL.@]
 401  *
 402  * Convert a count of seconds since 1980 to a time.
 403  *
 404  * PARAMS
 405  *   Seconds [I] Time to convert.
 406  *   Time    [O] Destination for the converted time.
 407  *
 408  * RETURNS
 409  *   Nothing.
 410  */
 411 void WINAPI RtlSecondsSince1980ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 412 {
 413     Time->QuadPart = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1980;
 414 }
 415
 416 /******************************************************************************
 417  *       RtlTimeToElapsedTimeFields [NTDLL.@]
 418  *
 419  * Convert a time to a count of elapsed seconds.
 420  *
 421  * PARAMS
 422  *   Time       [I] Time to convert.
 423  *   TimeFields [O] Destination for the converted time.
 424  *
 425  * RETURNS
 426  *   Nothing.
 427  */
 428 void WINAPI RtlTimeToElapsedTimeFields( const LARGE_INTEGER *Time, PTIME_FIELDS TimeFields )
 429 {
 430     LONGLONG time;
 431     INT rem;
 432
 433     time = Time->QuadPart / TICKSPERSEC;
 434     TimeFields->Milliseconds = (Time->QuadPart % TICKSPERSEC) / TICKSPERMSEC;
 435
 436     /* time is now in seconds */
 437     TimeFields->Year  = 0;
 438     TimeFields->Month = 0;
 439     TimeFields->Day   = time / SECSPERDAY;
 440
 441     /* rem is now the remaining seconds in the last day */
 442     rem = time % SECSPERDAY;
 443     TimeFields->Second = rem % 60;
 444     rem /= 60;
 445     TimeFields->Minute = rem % 60;
 446     TimeFields->Hour = rem / 60;
 447 }
 448
 449 /***********************************************************************
 450  *       NtQuerySystemTime [NTDLL.@]
 451  *       ZwQuerySystemTime [NTDLL.@]
 452  *
 453  * Get the current system time.
 454  *
 455  * PARAMS
 456  *   Time [O] Destination for the current system time.
 457  *
 458  * RETURNS
 459  *   Success: STATUS_SUCCESS.
 460  *   Failure: An NTSTATUS error code indicating the problem.
 461  */
 462 NTSTATUS WINAPI NtQuerySystemTime( PLARGE_INTEGER Time )
 463 {
 464     struct timeval now;
 465
 466     gettimeofday( &now, 0 );
 467     Time->QuadPart = now.tv_sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 468     Time->QuadPart += now.tv_usec * 10;
 469     return STATUS_SUCCESS;
 470 }
 471
 472 /******************************************************************************
 473  *  NtQueryPerformanceCounter   [NTDLL.@]
 474  */
 475 NTSTATUS WINAPI NtQueryPerformanceCounter( LARGE_INTEGER *counter, LARGE_INTEGER *frequency )
 476 {
 477     if (!counter) return STATUS_ACCESS_VIOLATION;
 478
 479     counter->QuadPart = monotonic_counter();
 480     if (frequency) frequency->QuadPart = TICKSPERSEC;
 481     return STATUS_SUCCESS;
 482 }
 483
 484
 485 /******************************************************************************
 486  * NtGetTickCount   (NTDLL.@)
 487  * ZwGetTickCount   (NTDLL.@)
 488  */
 489 ULONG WINAPI NtGetTickCount(void)
 490 {
 491     return monotonic_counter() / TICKSPERMSEC;
 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             *tzi = reg_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, current_bias = 65535;
 733     struct tm *tm;
 734     time_t year_start, year_end, tmp, dlt = 0, std = 0;
 735     int is_dst, current_is_dst, bias;
 736
 737     RtlEnterCriticalSection( &TIME_tz_section );
 738
 739     year_start = time(NULL);
 740     tm = gmtime(&year_start);
 741     bias = (LONG)(mktime(tm) - year_start) / 60;
 742
 743     tm = localtime(&year_start);
 744     current_is_dst = tm->tm_isdst;
 745     if (current_year == tm->tm_year && current_bias == bias)
 746     {
 747         *tzi = cached_tzi;
 748         RtlLeaveCriticalSection( &TIME_tz_section );
 749         return current_is_dst;
 750     }
 751
 752     memset(tzi, 0, sizeof(*tzi));
 753
 754     TRACE("tz data will be valid through year %d, bias %d\n", tm->tm_year + 1900, bias);
 755     current_year = tm->tm_year;
 756     current_bias = bias;
 757
 758     tzi->Bias = bias;
 759
 760     tm->tm_isdst = 0;
 761     tm->tm_mday = 1;
 762     tm->tm_mon = tm->tm_hour = tm->tm_min = tm->tm_sec = tm->tm_wday = tm->tm_yday = 0;
 763     year_start = mktime(tm);
 764     TRACE("year_start: %s", ctime(&year_start));
 765
 766     tm->tm_mday = tm->tm_wday = tm->tm_yday = 0;
 767     tm->tm_mon = 12;
 768     tm->tm_hour = 23;
 769     tm->tm_min = tm->tm_sec = 59;
 770     year_end = mktime(tm);
 771     TRACE("year_end: %s", ctime(&year_end));
 772
 773     tmp = find_dst_change(year_start, year_end, &is_dst);
 774     if (is_dst)
 775         dlt = tmp;
 776     else
 777         std = tmp;
 778
 779     tmp = find_dst_change(tmp, year_end, &is_dst);
 780     if (is_dst)
 781         dlt = tmp;
 782     else
 783         std = tmp;
 784
 785     TRACE("std: %s", ctime(&std));
 786     TRACE("dlt: %s", ctime(&dlt));
 787
 788     if (dlt == std || !dlt || !std)
 789         TRACE("there is no daylight saving rules in this time zone\n");
 790     else
 791     {
 792         tmp = dlt - tzi->Bias * 60;
 793         tm = gmtime(&tmp);
 794         TRACE("dlt gmtime: %s", asctime(tm));
 795
 796         tzi->DaylightBias = -60;
 797         tzi->DaylightDate.wYear = tm->tm_year + 1900;
 798         tzi->DaylightDate.wMonth = tm->tm_mon + 1;
 799         tzi->DaylightDate.wDayOfWeek = tm->tm_wday;
 800         tzi->DaylightDate.wDay = tm->tm_mday;
 801         tzi->DaylightDate.wHour = tm->tm_hour;
 802         tzi->DaylightDate.wMinute = tm->tm_min;
 803         tzi->DaylightDate.wSecond = tm->tm_sec;
 804         tzi->DaylightDate.wMilliseconds = 0;
 805
 806         TRACE("daylight (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 807             tzi->DaylightDate.wDay, tzi->DaylightDate.wMonth,
 808             tzi->DaylightDate.wYear, tzi->DaylightDate.wDayOfWeek,
 809             tzi->DaylightDate.wHour, tzi->DaylightDate.wMinute,
 810             tzi->DaylightDate.wSecond, tzi->DaylightDate.wMilliseconds,
 811             tzi->DaylightBias);
 812
 813         tmp = std - tzi->Bias * 60 - tzi->DaylightBias * 60;
 814         tm = gmtime(&tmp);
 815         TRACE("std gmtime: %s", asctime(tm));
 816
 817         tzi->StandardBias = 0;
 818         tzi->StandardDate.wYear = tm->tm_year + 1900;
 819         tzi->StandardDate.wMonth = tm->tm_mon + 1;
 820         tzi->StandardDate.wDayOfWeek = tm->tm_wday;
 821         tzi->StandardDate.wDay = tm->tm_mday;
 822         tzi->StandardDate.wHour = tm->tm_hour;
 823         tzi->StandardDate.wMinute = tm->tm_min;
 824         tzi->StandardDate.wSecond = tm->tm_sec;
 825         tzi->StandardDate.wMilliseconds = 0;
 826
 827         TRACE("standard (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 828             tzi->StandardDate.wDay, tzi->StandardDate.wMonth,
 829             tzi->StandardDate.wYear, tzi->StandardDate.wDayOfWeek,
 830             tzi->StandardDate.wHour, tzi->StandardDate.wMinute,
 831             tzi->StandardDate.wSecond, tzi->StandardDate.wMilliseconds,
 832             tzi->StandardBias);
 833     }
 834
 835     find_reg_tz_info(tzi);
 836     cached_tzi = *tzi;
 837
 838     RtlLeaveCriticalSection( &TIME_tz_section );
 839
 840     return current_is_dst;
 841 }
 842
 843 /***********************************************************************
 844  *      RtlQueryTimeZoneInformation [NTDLL.@]
 845  *
 846  * Get information about the current timezone.
 847  *
 848  * PARAMS
 849  *   tzinfo [O] Destination for the retrieved timezone info.
 850  *
 851  * RETURNS
 852  *   Success: STATUS_SUCCESS.
 853  *   Failure: An NTSTATUS error code indicating the problem.
 854  */
 855 NTSTATUS WINAPI RtlQueryTimeZoneInformation(RTL_TIME_ZONE_INFORMATION *tzinfo)
 856 {
 857     init_tz_info( tzinfo );
 858
 859     return STATUS_SUCCESS;
 860 }
 861
 862 /***********************************************************************
 863  *       RtlSetTimeZoneInformation [NTDLL.@]
 864  *
 865  * Set the current time zone information.
 866  *
 867  * PARAMS
 868  *   tzinfo [I] Timezone information to set.
 869  *
 870  * RETURNS
 871  *   Success: STATUS_SUCCESS.
 872  *   Failure: An NTSTATUS error code indicating the problem.
 873  *
 874  */
 875 NTSTATUS WINAPI RtlSetTimeZoneInformation( const RTL_TIME_ZONE_INFORMATION *tzinfo )
 876 {
 877     return STATUS_PRIVILEGE_NOT_HELD;
 878 }
 879
 880 /***********************************************************************
 881  *        NtSetSystemTime [NTDLL.@]
 882  *        ZwSetSystemTime [NTDLL.@]
 883  *
 884  * Set the system time.
 885  *
 886  * PARAMS
 887  *   NewTime [I] The time to set.
 888  *   OldTime [O] Optional destination for the previous system time.
 889  *
 890  * RETURNS
 891  *   Success: STATUS_SUCCESS.
 892  *   Failure: An NTSTATUS error code indicating the problem.
 893  */
 894 NTSTATUS WINAPI NtSetSystemTime(const LARGE_INTEGER *NewTime, LARGE_INTEGER *OldTime)
 895 {
 896     struct timeval tv;
 897     time_t tm_t;
 898     DWORD sec, oldsec;
 899     LARGE_INTEGER tm;
 900
 901     /* Return the old time if necessary */
 902     if (!OldTime) OldTime = &tm;
 903
 904     NtQuerySystemTime( OldTime );
 905     RtlTimeToSecondsSince1970( OldTime, &oldsec );
 906
 907     RtlTimeToSecondsSince1970( NewTime, &sec );
 908
 909     /* set the new time */
 910     tv.tv_sec = sec;
 911     tv.tv_usec = 0;
 912
 913 #ifdef HAVE_SETTIMEOFDAY
 914     if (!settimeofday(&tv, NULL)) /* 0 is OK, -1 is error */
 915         return STATUS_SUCCESS;
 916     tm_t = sec;
 917     ERR("Cannot set time to %s, time adjustment %ld: %s\n",
 918         ctime(&tm_t), (long)(sec-oldsec), strerror(errno));
 919     if (errno == EPERM)
 920         return STATUS_PRIVILEGE_NOT_HELD;
 921     else
 922         return STATUS_INVALID_PARAMETER;
 923 #else
 924     tm_t = sec;
 925     FIXME("setting time to %s not implemented for missing settimeofday\n",
 926         ctime(&tm_t));
 927     return STATUS_NOT_IMPLEMENTED;
 928 #endif
 929 }
 930
 931 /***********************************************************************
 932  *        RtlQueryUnbiasedInterruptTime [NTDLL.@]
 933  */
 934 NTSTATUS WINAPI RtlQueryUnbiasedInterruptTime(ULONGLONG *time)
 935 {
 936     *time = monotonic_counter();
 937     return STATUS_SUCCESS;
 938 }