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 = Time->QuadPart / TICKSPERSEC - SECS_1601_TO_1970;
 335     if (tmp > 0xffffffff) return FALSE;
 336     *Seconds = tmp;
 337     return TRUE;
 338 }
 339
 340 /******************************************************************************
 341  *       RtlTimeToSecondsSince1980 [NTDLL.@]
 342  *
 343  * Convert a time into a count of seconds since 1980.
 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 RtlTimeToSecondsSince1980( const LARGE_INTEGER *Time, LPDWORD Seconds )
 354 {
 355     ULONGLONG tmp = Time->QuadPart / TICKSPERSEC - SECS_1601_TO_1980;
 356     if (tmp > 0xffffffff) return FALSE;
 357     *Seconds = tmp;
 358     return TRUE;
 359 }
 360
 361 /******************************************************************************
 362  *       RtlSecondsSince1970ToTime [NTDLL.@]
 363  *
 364  * Convert a count of seconds since 1970 to a time.
 365  *
 366  * PARAMS
 367  *   Seconds [I] Time to convert.
 368  *   Time    [O] Destination for the converted time.
 369  *
 370  * RETURNS
 371  *   Nothing.
 372  */
 373 void WINAPI RtlSecondsSince1970ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 374 {
 375     Time->QuadPart = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 376 }
 377
 378 /******************************************************************************
 379  *       RtlSecondsSince1980ToTime [NTDLL.@]
 380  *
 381  * Convert a count of seconds since 1980 to a time.
 382  *
 383  * PARAMS
 384  *   Seconds [I] Time to convert.
 385  *   Time    [O] Destination for the converted time.
 386  *
 387  * RETURNS
 388  *   Nothing.
 389  */
 390 void WINAPI RtlSecondsSince1980ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 391 {
 392     Time->QuadPart = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1980;
 393 }
 394
 395 /******************************************************************************
 396  *       RtlTimeToElapsedTimeFields [NTDLL.@]
 397  *
 398  * Convert a time to a count of elapsed seconds.
 399  *
 400  * PARAMS
 401  *   Time       [I] Time to convert.
 402  *   TimeFields [O] Destination for the converted time.
 403  *
 404  * RETURNS
 405  *   Nothing.
 406  */
 407 void WINAPI RtlTimeToElapsedTimeFields( const LARGE_INTEGER *Time, PTIME_FIELDS TimeFields )
 408 {
 409     LONGLONG time;
 410     INT rem;
 411
 412     time = Time->QuadPart / TICKSPERSEC;
 413     TimeFields->Milliseconds = (Time->QuadPart % TICKSPERSEC) / TICKSPERMSEC;
 414
 415     /* time is now in seconds */
 416     TimeFields->Year  = 0;
 417     TimeFields->Month = 0;
 418     TimeFields->Day   = time / SECSPERDAY;
 419
 420     /* rem is now the remaining seconds in the last day */
 421     rem = time % SECSPERDAY;
 422     TimeFields->Second = rem % 60;
 423     rem /= 60;
 424     TimeFields->Minute = rem % 60;
 425     TimeFields->Hour = rem / 60;
 426 }
 427
 428 /***********************************************************************
 429  *       NtQuerySystemTime [NTDLL.@]
 430  *       ZwQuerySystemTime [NTDLL.@]
 431  *
 432  * Get the current system time.
 433  *
 434  * PARAMS
 435  *   Time [O] Destination for the current system time.
 436  *
 437  * RETURNS
 438  *   Success: STATUS_SUCCESS.
 439  *   Failure: An NTSTATUS error code indicating the problem.
 440  */
 441 NTSTATUS WINAPI NtQuerySystemTime( PLARGE_INTEGER Time )
 442 {
 443     struct timeval now;
 444
 445     gettimeofday( &now, 0 );
 446     Time->QuadPart = now.tv_sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 447     Time->QuadPart += now.tv_usec * 10;
 448     return STATUS_SUCCESS;
 449 }
 450
 451 /******************************************************************************
 452  *  NtQueryPerformanceCounter   [NTDLL.@]
 453  *
 454  *  Note: Windows uses a timer clocked at a multiple of 1193182 Hz. There is a
 455  *  good number of applications that crash when the returned frequency is either
 456  *  lower or higher than what Windows gives. Also too high counter values are
 457  *  reported to give problems.
 458  */
 459 NTSTATUS WINAPI NtQueryPerformanceCounter( PLARGE_INTEGER Counter, PLARGE_INTEGER Frequency )
 460 {
 461     LARGE_INTEGER now;
 462
 463     if (!Counter) return STATUS_ACCESS_VIOLATION;
 464
 465     /* convert a counter that increments at a rate of 10 MHz
 466      * to one of 1.193182 MHz, with some care for arithmetic
 467      * overflow and good accuracy (21/176 = 0.11931818) */
 468     NtQuerySystemTime( &now );
 469     Counter->QuadPart = ((now.QuadPart - server_start_time) * 21) / 176;
 470     if (Frequency) Frequency->QuadPart = 1193182;
 471     return STATUS_SUCCESS;
 472 }
 473
 474
 475 /******************************************************************************
 476  * NtGetTickCount   (NTDLL.@)
 477  * ZwGetTickCount   (NTDLL.@)
 478  */
 479 ULONG WINAPI NtGetTickCount(void)
 480 {
 481     LARGE_INTEGER now;
 482
 483     NtQuerySystemTime( &now );
 484     return (now.QuadPart - server_start_time) / 10000;
 485 }
 486
 487 /* calculate the mday of dst change date, so that for instance Sun 5 Oct 2007
 488  * (last Sunday in October of 2007) becomes Sun Oct 28 2007
 489  *
 490  * Note: year, day and month must be in unix format.
 491  */
 492 static int weekday_to_mday(int year, int day, int mon, int day_of_week)
 493 {
 494     struct tm date;
 495     time_t tmp;
 496     int wday, mday;
 497
 498     /* find first day in the month matching week day of the date */
 499     memset(&date, 0, sizeof(date));
 500     date.tm_year = year;
 501     date.tm_mon = mon;
 502     date.tm_mday = -1;
 503     date.tm_wday = -1;
 504     do
 505     {
 506         date.tm_mday++;
 507         tmp = mktime(&date);
 508     } while (date.tm_wday != day_of_week || date.tm_mon != mon);
 509
 510     mday = date.tm_mday;
 511
 512     /* find number of week days in the month matching week day of the date */
 513     wday = 1; /* 1 - 1st, ...., 5 - last */
 514     while (wday < day)
 515     {
 516         struct tm *tm;
 517
 518         date.tm_mday += 7;
 519         tmp = mktime(&date);
 520         tm = localtime(&tmp);
 521         if (tm->tm_mon != mon)
 522             break;
 523         mday = tm->tm_mday;
 524         wday++;
 525     }
 526
 527     return mday;
 528 }
 529
 530 static BOOL match_tz_date(const RTL_SYSTEM_TIME *st, const RTL_SYSTEM_TIME *reg_st)
 531 {
 532     WORD wDay;
 533
 534     if (st->wMonth != reg_st->wMonth) return FALSE;
 535
 536     if (!st->wMonth) return TRUE; /* no transition dates */
 537
 538     wDay = reg_st->wDay;
 539     if (!reg_st->wYear) /* date in a day-of-week format */
 540         wDay = weekday_to_mday(st->wYear - 1900, reg_st->wDay, reg_st->wMonth - 1, reg_st->wDayOfWeek);
 541
 542     if (st->wDay != wDay ||
 543         st->wHour != reg_st->wHour ||
 544         st->wMinute != reg_st->wMinute ||
 545         st->wSecond != reg_st->wSecond ||
 546         st->wMilliseconds != reg_st->wMilliseconds) return FALSE;
 547
 548     return TRUE;
 549 }
 550
 551 static BOOL match_tz_info(const RTL_TIME_ZONE_INFORMATION *tzi, const RTL_TIME_ZONE_INFORMATION *reg_tzi)
 552 {
 553     if (tzi->Bias == reg_tzi->Bias &&
 554         match_tz_date(&tzi->StandardDate, &reg_tzi->StandardDate) &&
 555         match_tz_date(&tzi->DaylightDate, &reg_tzi->DaylightDate))
 556         return TRUE;
 557
 558     return FALSE;
 559 }
 560
 561 static BOOL reg_query_value(HKEY hkey, LPCWSTR name, DWORD type, void *data, DWORD count)
 562 {
 563     UNICODE_STRING nameW;
 564     char buf[256];
 565     KEY_VALUE_PARTIAL_INFORMATION *info = (KEY_VALUE_PARTIAL_INFORMATION *)buf;
 566
 567     if (count > sizeof(buf) - sizeof(KEY_VALUE_PARTIAL_INFORMATION))
 568         return FALSE;
 569
 570     RtlInitUnicodeString(&nameW, name);
 571
 572     if (NtQueryValueKey(hkey, &nameW, KeyValuePartialInformation,
 573                         buf, sizeof(buf), &count))
 574         return FALSE;
 575
 576     if (info->Type != type) return FALSE;
 577
 578     memcpy(data, info->Data, info->DataLength);
 579     return TRUE;
 580 }
 581
 582 static void find_reg_tz_info(RTL_TIME_ZONE_INFORMATION *tzi)
 583 {
 584     static const WCHAR Time_ZonesW[] = { 'M','a','c','h','i','n','e','\\',
 585         'S','o','f','t','w','a','r','e','\\',
 586         'M','i','c','r','o','s','o','f','t','\\',
 587         'W','i','n','d','o','w','s',' ','N','T','\\',
 588         'C','u','r','r','e','n','t','V','e','r','s','i','o','n','\\',
 589         'T','i','m','e',' ','Z','o','n','e','s',0 };
 590     HANDLE hkey;
 591     ULONG idx;
 592     OBJECT_ATTRIBUTES attr;
 593     UNICODE_STRING nameW;
 594     WCHAR buf[128];
 595
 596     attr.Length = sizeof(attr);
 597     attr.RootDirectory = 0;
 598     attr.ObjectName = &nameW;
 599     attr.Attributes = 0;
 600     attr.SecurityDescriptor = NULL;
 601     attr.SecurityQualityOfService = NULL;
 602     RtlInitUnicodeString(&nameW, Time_ZonesW);
 603     if (NtOpenKey(&hkey, KEY_READ, &attr))
 604     {
 605         WARN("Unable to open the time zones key\n");
 606         return;
 607     }
 608
 609     idx = 0;
 610     nameW.Buffer = buf;
 611     nameW.Length = sizeof(buf);
 612     nameW.MaximumLength = sizeof(buf);
 613
 614     while (!RtlpNtEnumerateSubKey(hkey, &nameW, idx++))
 615     {
 616         static const WCHAR stdW[] = { 'S','t','d',0 };
 617         static const WCHAR dltW[] = { 'D','l','t',0 };
 618         static const WCHAR tziW[] = { 'T','Z','I',0 };
 619         RTL_TIME_ZONE_INFORMATION reg_tzi;
 620         HANDLE hSubkey;
 621         struct tz_reg_data
 622         {
 623             LONG bias;
 624             LONG std_bias;
 625             LONG dlt_bias;
 626             RTL_SYSTEM_TIME std_date;
 627             RTL_SYSTEM_TIME dlt_date;
 628         } tz_data;
 629
 630         attr.Length = sizeof(attr);
 631         attr.RootDirectory = hkey;
 632         attr.ObjectName = &nameW;
 633         attr.Attributes = 0;
 634         attr.SecurityDescriptor = NULL;
 635         attr.SecurityQualityOfService = NULL;
 636         if (NtOpenKey(&hSubkey, KEY_READ, &attr))
 637         {
 638             WARN("Unable to open subkey %s\n", debugstr_wn(nameW.Buffer, nameW.Length/sizeof(WCHAR)));
 639             continue;
 640         }
 641
 642 #define get_value(hkey, name, type, data, len) \
 643     if (!reg_query_value(hkey, name, type, data, len)) \
 644     { \
 645         WARN("can't read data from %s\n", debugstr_w(name)); \
 646         NtClose(hkey); \
 647         continue; \
 648     }
 649
 650         get_value(hSubkey, stdW, REG_SZ, reg_tzi.StandardName, sizeof(reg_tzi.StandardName));
 651         get_value(hSubkey, dltW, REG_SZ, reg_tzi.DaylightName, sizeof(reg_tzi.DaylightName));
 652         get_value(hSubkey, tziW, REG_BINARY, &tz_data, sizeof(tz_data));
 653
 654 #undef get_value
 655
 656         reg_tzi.Bias = tz_data.bias;
 657         reg_tzi.StandardBias = tz_data.std_bias;
 658         reg_tzi.DaylightBias = tz_data.dlt_bias;
 659         reg_tzi.StandardDate = tz_data.std_date;
 660         reg_tzi.DaylightDate = tz_data.dlt_date;
 661
 662         TRACE("%s: bias %d\n", debugstr_wn(nameW.Buffer, nameW.Length/sizeof(WCHAR)), reg_tzi.Bias);
 663         TRACE("std (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 664             reg_tzi.StandardDate.wDay, reg_tzi.StandardDate.wMonth,
 665             reg_tzi.StandardDate.wYear, reg_tzi.StandardDate.wDayOfWeek,
 666             reg_tzi.StandardDate.wHour, reg_tzi.StandardDate.wMinute,
 667             reg_tzi.StandardDate.wSecond, reg_tzi.StandardDate.wMilliseconds,
 668             reg_tzi.StandardBias);
 669         TRACE("dst (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 670             reg_tzi.DaylightDate.wDay, reg_tzi.DaylightDate.wMonth,
 671             reg_tzi.DaylightDate.wYear, reg_tzi.DaylightDate.wDayOfWeek,
 672             reg_tzi.DaylightDate.wHour, reg_tzi.DaylightDate.wMinute,
 673             reg_tzi.DaylightDate.wSecond, reg_tzi.DaylightDate.wMilliseconds,
 674             reg_tzi.DaylightBias);
 675
 676         NtClose(hSubkey);
 677
 678         if (match_tz_info(tzi, &reg_tzi))
 679         {
 680             *tzi = reg_tzi;
 681             NtClose(hkey);
 682             return;
 683         }
 684
 685         /* reset len */
 686         nameW.Length = sizeof(buf);
 687         nameW.MaximumLength = sizeof(buf);
 688     }
 689
 690     NtClose(hkey);
 691
 692     FIXME("Can't find matching timezone information in the registry for "
 693           "bias %d, std (d/m/y): %u/%02u/%04u, dlt (d/m/y): %u/%02u/%04u\n",
 694           tzi->Bias,
 695           tzi->StandardDate.wDay, tzi->StandardDate.wMonth, tzi->StandardDate.wYear,
 696           tzi->DaylightDate.wDay, tzi->DaylightDate.wMonth, tzi->DaylightDate.wYear);
 697 }
 698
 699 static time_t find_dst_change(unsigned long min, unsigned long max, int *is_dst)
 700 {
 701     time_t start;
 702     struct tm *tm;
 703
 704     start = min;
 705     tm = localtime(&start);
 706     *is_dst = !tm->tm_isdst;
 707     TRACE("starting date isdst %d, %s", !*is_dst, ctime(&start));
 708
 709     while (min <= max)
 710     {
 711         time_t pos = (min + max) / 2;
 712         tm = localtime(&pos);
 713
 714         if (tm->tm_isdst != *is_dst)
 715             min = pos + 1;
 716         else
 717             max = pos - 1;
 718     }
 719     return min;
 720 }
 721
 722 static int init_tz_info(RTL_TIME_ZONE_INFORMATION *tzi)
 723 {
 724     static RTL_TIME_ZONE_INFORMATION cached_tzi;
 725     static int current_year = -1, current_bias = 65535;
 726     struct tm *tm;
 727     time_t year_start, year_end, tmp, dlt = 0, std = 0;
 728     int is_dst, current_is_dst, bias;
 729
 730     RtlEnterCriticalSection( &TIME_tz_section );
 731
 732     year_start = time(NULL);
 733     tm = gmtime(&year_start);
 734     bias = (LONG)(mktime(tm) - year_start) / 60;
 735
 736     tm = localtime(&year_start);
 737     current_is_dst = tm->tm_isdst;
 738     if (current_year == tm->tm_year && current_bias == bias)
 739     {
 740         *tzi = cached_tzi;
 741         RtlLeaveCriticalSection( &TIME_tz_section );
 742         return current_is_dst;
 743     }
 744
 745     memset(tzi, 0, sizeof(*tzi));
 746
 747     TRACE("tz data will be valid through year %d, bias %d\n", tm->tm_year + 1900, bias);
 748     current_year = tm->tm_year;
 749     current_bias = bias;
 750
 751     tzi->Bias = bias;
 752
 753     tm->tm_isdst = 0;
 754     tm->tm_mday = 1;
 755     tm->tm_mon = tm->tm_hour = tm->tm_min = tm->tm_sec = tm->tm_wday = tm->tm_yday = 0;
 756     year_start = mktime(tm);
 757     TRACE("year_start: %s", ctime(&year_start));
 758
 759     tm->tm_mday = tm->tm_wday = tm->tm_yday = 0;
 760     tm->tm_mon = 12;
 761     tm->tm_hour = 23;
 762     tm->tm_min = tm->tm_sec = 59;
 763     year_end = mktime(tm);
 764     TRACE("year_end: %s", ctime(&year_end));
 765
 766     tmp = find_dst_change(year_start, year_end, &is_dst);
 767     if (is_dst)
 768         dlt = tmp;
 769     else
 770         std = tmp;
 771
 772     tmp = find_dst_change(tmp, year_end, &is_dst);
 773     if (is_dst)
 774         dlt = tmp;
 775     else
 776         std = tmp;
 777
 778     TRACE("std: %s", ctime(&std));
 779     TRACE("dlt: %s", ctime(&dlt));
 780
 781     if (dlt == std || !dlt || !std)
 782         TRACE("there is no daylight saving rules in this time zone\n");
 783     else
 784     {
 785         tmp = dlt - tzi->Bias * 60;
 786         tm = gmtime(&tmp);
 787         TRACE("dlt gmtime: %s", asctime(tm));
 788
 789         tzi->DaylightBias = -60;
 790         tzi->DaylightDate.wYear = tm->tm_year + 1900;
 791         tzi->DaylightDate.wMonth = tm->tm_mon + 1;
 792         tzi->DaylightDate.wDayOfWeek = tm->tm_wday;
 793         tzi->DaylightDate.wDay = tm->tm_mday;
 794         tzi->DaylightDate.wHour = tm->tm_hour;
 795         tzi->DaylightDate.wMinute = tm->tm_min;
 796         tzi->DaylightDate.wSecond = tm->tm_sec;
 797         tzi->DaylightDate.wMilliseconds = 0;
 798
 799         TRACE("daylight (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 800             tzi->DaylightDate.wDay, tzi->DaylightDate.wMonth,
 801             tzi->DaylightDate.wYear, tzi->DaylightDate.wDayOfWeek,
 802             tzi->DaylightDate.wHour, tzi->DaylightDate.wMinute,
 803             tzi->DaylightDate.wSecond, tzi->DaylightDate.wMilliseconds,
 804             tzi->DaylightBias);
 805
 806         tmp = std - tzi->Bias * 60 - tzi->DaylightBias * 60;
 807         tm = gmtime(&tmp);
 808         TRACE("std gmtime: %s", asctime(tm));
 809
 810         tzi->StandardBias = 0;
 811         tzi->StandardDate.wYear = tm->tm_year + 1900;
 812         tzi->StandardDate.wMonth = tm->tm_mon + 1;
 813         tzi->StandardDate.wDayOfWeek = tm->tm_wday;
 814         tzi->StandardDate.wDay = tm->tm_mday;
 815         tzi->StandardDate.wHour = tm->tm_hour;
 816         tzi->StandardDate.wMinute = tm->tm_min;
 817         tzi->StandardDate.wSecond = tm->tm_sec;
 818         tzi->StandardDate.wMilliseconds = 0;
 819
 820         TRACE("standard (d/m/y): %u/%02u/%04u day of week %u %u:%02u:%02u.%03u bias %d\n",
 821             tzi->StandardDate.wDay, tzi->StandardDate.wMonth,
 822             tzi->StandardDate.wYear, tzi->StandardDate.wDayOfWeek,
 823             tzi->StandardDate.wHour, tzi->StandardDate.wMinute,
 824             tzi->StandardDate.wSecond, tzi->StandardDate.wMilliseconds,
 825             tzi->StandardBias);
 826     }
 827
 828     find_reg_tz_info(tzi);
 829     cached_tzi = *tzi;
 830
 831     RtlLeaveCriticalSection( &TIME_tz_section );
 832
 833     return current_is_dst;
 834 }
 835
 836 /***********************************************************************
 837  *      RtlQueryTimeZoneInformation [NTDLL.@]
 838  *
 839  * Get information about the current timezone.
 840  *
 841  * PARAMS
 842  *   tzinfo [O] Destination for the retrieved timezone info.
 843  *
 844  * RETURNS
 845  *   Success: STATUS_SUCCESS.
 846  *   Failure: An NTSTATUS error code indicating the problem.
 847  */
 848 NTSTATUS WINAPI RtlQueryTimeZoneInformation(RTL_TIME_ZONE_INFORMATION *tzinfo)
 849 {
 850     init_tz_info( tzinfo );
 851
 852     return STATUS_SUCCESS;
 853 }
 854
 855 /***********************************************************************
 856  *       RtlSetTimeZoneInformation [NTDLL.@]
 857  *
 858  * Set the current time zone information.
 859  *
 860  * PARAMS
 861  *   tzinfo [I] Timezone information to set.
 862  *
 863  * RETURNS
 864  *   Success: STATUS_SUCCESS.
 865  *   Failure: An NTSTATUS error code indicating the problem.
 866  *
 867  */
 868 NTSTATUS WINAPI RtlSetTimeZoneInformation( const RTL_TIME_ZONE_INFORMATION *tzinfo )
 869 {
 870     return STATUS_PRIVILEGE_NOT_HELD;
 871 }
 872
 873 /***********************************************************************
 874  *        NtSetSystemTime [NTDLL.@]
 875  *        ZwSetSystemTime [NTDLL.@]
 876  *
 877  * Set the system time.
 878  *
 879  * PARAMS
 880  *   NewTime [I] The time to set.
 881  *   OldTime [O] Optional destination for the previous system time.
 882  *
 883  * RETURNS
 884  *   Success: STATUS_SUCCESS.
 885  *   Failure: An NTSTATUS error code indicating the problem.
 886  */
 887 NTSTATUS WINAPI NtSetSystemTime(const LARGE_INTEGER *NewTime, LARGE_INTEGER *OldTime)
 888 {
 889     struct timeval tv;
 890     time_t tm_t;
 891     DWORD sec, oldsec;
 892     LARGE_INTEGER tm;
 893
 894     /* Return the old time if necessary */
 895     if (!OldTime) OldTime = &tm;
 896
 897     NtQuerySystemTime( OldTime );
 898     RtlTimeToSecondsSince1970( OldTime, &oldsec );
 899
 900     RtlTimeToSecondsSince1970( NewTime, &sec );
 901
 902     /* set the new time */
 903     tv.tv_sec = sec;
 904     tv.tv_usec = 0;
 905
 906 #ifdef HAVE_SETTIMEOFDAY
 907     if (!settimeofday(&tv, NULL)) /* 0 is OK, -1 is error */
 908         return STATUS_SUCCESS;
 909     tm_t = sec;
 910     ERR("Cannot set time to %s, time adjustment %ld: %s\n",
 911         ctime(&tm_t), (long)(sec-oldsec), strerror(errno));
 912     if (errno == EPERM)
 913         return STATUS_PRIVILEGE_NOT_HELD;
 914     else
 915         return STATUS_INVALID_PARAMETER;
 916 #else
 917     tm_t = sec;
 918     FIXME("setting time to %s not implemented for missing settimeofday\n",
 919         ctime(&tm_t));
 920     return STATUS_NOT_IMPLEMENTED;
 921 #endif
 922 }