git.oblomov.eu Git - wine/blob - 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  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include "config.h"
  26 #include "wine/port.h"
  27
  28 #include <stdarg.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <limits.h>
  32 #include <time.h>
  33 #ifdef HAVE_SYS_TIME_H
  34 # include <sys/time.h>
  35 #endif
  36 #ifdef HAVE_UNISTD_H
  37 # include <unistd.h>
  38 #endif
  39
  40 #define NONAMELESSUNION
  41 #define NONAMELESSSTRUCT
  42 #include "windef.h"
  43 #include "winbase.h"
  44 #include "winreg.h"
  45 #include "winternl.h"
  46 #include "wine/unicode.h"
  47 #include "wine/debug.h"
  48 #include "ntdll_misc.h"
  49
  50 WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
  51
  52 static CRITICAL_SECTION TIME_GetBias_section;
  53 static CRITICAL_SECTION_DEBUG critsect_debug =
  54 {
  55     0, 0, &TIME_GetBias_section,
  56     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  57       0, 0, { 0, (DWORD)(__FILE__ ": TIME_GetBias_section") }
  58 };
  59 static CRITICAL_SECTION TIME_GetBias_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  60
  61
  62 #define SETTIME_MAX_ADJUST 120
  63
  64 /* This structure is used to store strings that represent all of the time zones
  65  * in the world. (This is used to help GetTimeZoneInformation)
  66  */
  67 struct tagTZ_INFO
  68 {
  69     const char *psTZFromUnix;
  70     WCHAR psTZWindows[32];
  71     int bias;
  72     int dst;
  73 };
  74
  75 static const struct tagTZ_INFO TZ_INFO[] =
  76 {
  77    {"MHT",
  78     {'D','a','t','e','l','i','n','e',' ','S','t','a','n','d','a','r','d',' ',
  79      'T','i','m','e','\0'}, -720, 0},
  80    {"SST",
  81     {'S','a','m','o','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
  82      'e','\0'}, 660, 0},
  83    {"HST",
  84     {'H','a','w','a','i','i','a','n',' ','S','t','a','n','d','a','r','d',' ',
  85      'T','i','m','e','\0'}, 600, 0},
  86    {"AKDT",
  87     {'A','l','a','s','k','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
  88      'i','m','e','\0'}, 480, 1},
  89    {"PDT",
  90     {'P','a','c','i','f','i','c',' ','S','t','a','n','d','a','r','d',' ','T',
  91      'i','m','e','\0'}, 420, 1},
  92    {"MST",
  93     {'U','S',' ','M','o','u','n','t','a','i','n',' ','S','t','a','n','d','a',
  94      'r','d',' ','T','i','m','e','\0'}, 420, 0},
  95    {"MDT",
  96     {'M','o','u','n','t','a','i','n',' ','S','t','a','n','d','a','r','d',' ',
  97      'T','i','m','e','\0'}, 360, 1},
  98    {"CST",
  99     {'C','e','n','t','r','a','l',' ','A','m','e','r','i','c','a',' ','S','t',
 100      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, 360, 0},
 101    {"CDT",
 102     {'C','e','n','t','r','a','l',' ','S','t','a','n','d','a','r','d',' ','T',
 103      'i','m','e','\0'}, 300, 1},
 104    {"COT",
 105     {'S','A',' ','P','a','c','i','f','i','c',' ','S','t','a','n','d','a','r',
 106      'd',' ','T','i','m','e','\0'}, 300, 0},
 107    {"EDT",
 108     {'E','a','s','t','e','r','n',' ','S','t','a','n','d','a','r','d',' ','T',
 109      'i','m','e','\0'}, 240, 1},
 110    {"EST",
 111     {'U','S',' ','E','a','s','t','e','r','n',' ','S','t','a','n','d','a','r',
 112      'd',' ','T','i','m','e','\0'}, 300, 0},
 113    {"ADT",
 114     {'A','t','l','a','n','t','i','c',' ','S','t','a','n','d','a','r','d',' ',
 115      'T','i','m','e','\0'}, 180, 1},
 116    {"VET",
 117     {'S','A',' ','W','e','s','t','e','r','n',' ','S','t','a','n','d','a','r',
 118      'd',' ','T','i','m','e','\0'}, 240, 0},
 119    {"CLT",
 120     {'P','a','c','i','f','i','c',' ','S','A',' ','S','t','a','n','d','a','r',
 121      'd',' ','T','i','m','e','\0'}, 240, 0},
 122    {"NDT",
 123     {'N','e','w','f','o','u','n','d','l','a','n','d',' ','S','t','a','n','d',
 124      'a','r','d',' ','T','i','m','e','\0'}, 150, 1},
 125    {"BRT",
 126     {'E','.',' ','S','o','u','t','h',' ','A','m','e','r','i','c','a',' ','S',
 127      't','a','n','d','a','r','d',' ','T','i','m','e','\0'}, 180, 0},
 128    {"ART",
 129     {'S','A',' ','E','a','s','t','e','r','n',' ','S','t','a','n','d','a','r',
 130      'd',' ','T','i','m','e','\0'}, 180, 0},
 131    {"WGST",
 132     {'G','r','e','e','n','l','a','n','d',' ','S','t','a','n','d','a','r','d',
 133      ' ','T','i','m','e','\0'}, 120, 1},
 134    {"GST",
 135     {'M','i','d','-','A','t','l','a','n','t','i','c',' ','S','t','a','n','d',
 136      'a','r','d',' ','T','i','m','e','\0'}, 120, 0},
 137    {"AZOST",
 138     {'A','z','o','r','e','s',' ','S','t','a','n','d','a','r','d',' ','T','i',
 139      'm','e','\0'}, 0, 1},
 140    {"CVT",
 141     {'C','a','p','e',' ','V','e','r','d','e',' ','S','t','a','n','d','a','r',
 142      'd',' ','T','i','m','e','\0'}, 60, 0},
 143    {"WET",
 144     {'G','r','e','e','n','w','i','c','h',' ','S','t','a','n','d','a','r','d',
 145      ' ','T','i','m','e','\0'}, 0, 0},
 146    {"BST",
 147     {'G','M','T',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'},
 148     -60, 1},
 149    {"GMT",
 150     {'G','M','T',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'},
 151     0, 0},
 152    {"UTC",
 153     {'G','M','T',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'},
 154     0, 0},
 155    {"CEST",
 156     {'C','e','n','t','r','a','l',' ','E','u','r','o','p','e',' ','S','t','a',
 157      'n','d','a','r','d',' ','T','i','m','e','\0'}, -120, 1},
 158    {"MET",
 159     {'C','e','n','t','r','a','l',' ','E','u','r','o','p','e',' ','S','t','a',
 160      'n','d','a','r','d',' ','T','i','m','e','\0'}, -60, 0},
 161    {"MEST",
 162     {'C','e','n','t','r','a','l',' ','E','u','r','o','p','e',' ','D','a','y',
 163      'l','i','g','h','t',' ','T','i','m','e','\0'}, -120, 1},
 164    {"WAT",
 165     {'W','.',' ','C','e','n','t','r','a','l',' ','A','f','r','i','c','a',' ',
 166      'S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'}, -60, 0},
 167    {"EEST",
 168     {'E','.',' ','E','u','r','o','p','e',' ','S','t','a','n','d','a','r','d',
 169      ' ','T','i','m','e','\0'}, -180, 1},
 170    {"EET",
 171     {'E','g','y','p','t',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 172      'e','\0'}, -120, 0},
 173    {"CAT",
 174     {'S','o','u','t','h',' ','A','f','r','i','c','a',' ','S','t','a','n','d',
 175      'a','r','d',' ','T','i','m','e','\0'}, -120, 0},
 176    {"IST",
 177     {'I','s','r','a','e','l',' ','S','t','a','n','d','a','r','d',' ','T','i',
 178      'm','e','\0'}, -120, 0},
 179    {"ADT",
 180     {'A','r','a','b','i','c',' ','S','t','a','n','d','a','r','d',' ','T','i',
 181      'm','e','\0'}, -240, 1},
 182    {"AST",
 183     {'A','r','a','b',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 184      '\0'}, -180, 0},
 185    {"MSD",
 186     {'R','u','s','s','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 187      'i','m','e','\0'}, -240, 1},
 188    {"EAT",
 189     {'E','.',' ','A','f','r','i','c','a',' ','S','t','a','n','d','a','r','d',
 190      ' ','T','i','m','e','\0'}, -180, 0},
 191    {"IRST",
 192     {'I','r','a','n',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 193      '\0'}, -270, 1},
 194    {"GST",
 195     {'A','r','a','b','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 196      'i','m','e','\0'}, -240, 0},
 197    {"AZST",
 198     {'C','a','u','c','a','s','u','s',' ','S','t','a','n','d','a','r','d',' ',
 199      'T','i','m','e','\0'}, -300, 1},
 200    {"AFT",
 201     {'A','f','g','h','a','n','i','s','t','a','n',' ','S','t','a','n','d','a',
 202      'r','d',' ','T','i','m','e','\0'}, -270, 0},
 203    {"YEKST",
 204     {'E','k','a','t','e','r','i','n','b','u','r','g',' ','S','t','a','n','d',
 205      'a','r','d',' ','T','i','m','e','\0'}, -360, 1},
 206    {"PKT",
 207     {'W','e','s','t',' ','A','s','i','a',' ','S','t','a','n','d','a','r','d',
 208      ' ','T','i','m','e','\0'}, -300, 0},
 209    {"IST",
 210     {'I','n','d','i','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 211      'e','\0'}, -330, 0},
 212    {"NPT",
 213     {'N','e','p','a','l',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 214      'e','\0'}, -345, 0},
 215    {"ALMST",
 216     {'N','.',' ','C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t',
 217      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -420, 1},
 218    {"BDT",
 219     {'C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t','a','n','d',
 220      'a','r','d',' ','T','i','m','e','\0'}, -360, 0},
 221    {"LKT",
 222     {'S','r','i',' ','L','a','n','k','a',' ','S','t','a','n','d','a','r','d',
 223      ' ','T','i','m','e','\0'}, -360, 0},
 224    {"MMT",
 225     {'M','y','a','n','m','a','r',' ','S','t','a','n','d','a','r','d',' ','T',
 226      'i','m','e','\0'}, -390, 0},
 227    {"ICT",
 228     {'S','E',' ','A','s','i','a',' ','S','t','a','n','d','a','r','d',' ','T',
 229      'i','m','e','\0'}, -420, 0},
 230    {"KRAST",
 231     {'N','o','r','t','h',' ','A','s','i','a',' ','S','t','a','n','d','a','r',
 232      'd',' ','T','i','m','e','\0'}, -480, 1},
 233    {"CST",
 234     {'C','h','i','n','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 235      'e','\0'}, -480, 0},
 236    {"IRKST",
 237     {'N','o','r','t','h',' ','A','s','i','a',' ','E','a','s','t',' ','S','t',
 238      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -540, 1},
 239    {"SGT",
 240     {'M','a','l','a','y',' ','P','e','n','i','n','s','u','l','a',' ','S','t',
 241      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -480, 0},
 242    {"WST",
 243     {'W','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 244      'a','r','d',' ','T','i','m','e','\0'}, -480, 0},
 245    {"JST",
 246     {'T','o','k','y','o',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 247      'e','\0'}, -540, 0},
 248    {"KST",
 249     {'K','o','r','e','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 250      'e','\0'}, -540, 0},
 251    {"YAKST",
 252     {'Y','a','k','u','t','s','k',' ','S','t','a','n','d','a','r','d',' ','T',
 253      'i','m','e','\0'}, -600, 1},
 254    {"CST",
 255     {'C','e','n','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a',
 256      'n','d','a','r','d',' ','T','i','m','e','\0'}, -570, 0},
 257    {"EST",
 258     {'E','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 259      'a','r','d',' ','T','i','m','e','\0'}, -600, 0},
 260    {"GST",
 261     {'W','e','s','t',' ','P','a','c','i','f','i','c',' ','S','t','a','n','d',
 262      'a','r','d',' ','T','i','m','e','\0'}, -600, 0},
 263    {"VLAST",
 264     {'V','l','a','d','i','v','o','s','t','o','k',' ','S','t','a','n','d','a',
 265      'r','d',' ','T','i','m','e','\0'}, -660, 1},
 266    {"MAGST",
 267     {'C','e','n','t','r','a','l',' ','P','a','c','i','f','i','c',' ','S','t',
 268      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -720, 1},
 269    {"NZST",
 270     {'N','e','w',' ','Z','e','a','l','a','n','d',' ','S','t','a','n','d','a',
 271      'r','d',' ','T','i','m','e','\0'}, -720, 0},
 272    {"FJT",
 273     {'F','i','j','i',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 274      '\0'}, -720, 0},
 275    {"TOT",
 276     {'T','o','n','g','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 277      'e','\0'}, -780, 0}
 278 };
 279
 280 #define TICKSPERSEC        10000000
 281 #define TICKSPERMSEC       10000
 282 #define SECSPERDAY         86400
 283 #define SECSPERHOUR        3600
 284 #define SECSPERMIN         60
 285 #define MINSPERHOUR        60
 286 #define HOURSPERDAY        24
 287 #define EPOCHWEEKDAY       1  /* Jan 1, 1601 was Monday */
 288 #define DAYSPERWEEK        7
 289 #define EPOCHYEAR          1601
 290 #define DAYSPERNORMALYEAR  365
 291 #define DAYSPERLEAPYEAR    366
 292 #define MONSPERYEAR        12
 293 #define DAYSPERQUADRICENTENNIUM (365 * 400 + 97)
 294 #define DAYSPERNORMALCENTURY (365 * 100 + 24)
 295 #define DAYSPERNORMALQUADRENNIUM (365 * 4 + 1)
 296
 297 /* 1601 to 1970 is 369 years plus 89 leap days */
 298 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
 299 #define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
 300 /* 1601 to 1980 is 379 years plus 91 leap days */
 301 #define SECS_1601_TO_1980  ((379 * 365 + 91) * (ULONGLONG)SECSPERDAY)
 302 #define TICKS_1601_TO_1980 (SECS_1601_TO_1980 * TICKSPERSEC)
 303 /* max ticks that can be represented as Unix time */
 304 #define TICKS_1601_TO_UNIX_MAX ((SECS_1601_TO_1970 + INT_MAX) * TICKSPERSEC)
 305
 306
 307 static const int MonthLengths[2][MONSPERYEAR] =
 308 {
 309         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
 310         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
 311 };
 312
 313 static const int YearDays[2][MONSPERYEAR+1] =
 314 {
 315         { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
 316         { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
 317 };
 318
 319 static inline int IsLeapYear(int Year)
 320 {
 321         return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ? 1 : 0;
 322 }
 323
 324 static inline void NormalizeTimeFields(CSHORT *FieldToNormalize, CSHORT *CarryField,int Modulus)
 325 {
 326         *FieldToNormalize = (CSHORT) (*FieldToNormalize - Modulus);
 327         *CarryField = (CSHORT) (*CarryField + 1);
 328 }
 329
 330 /***********************************************************************
 331  *              NTDLL_get_server_timeout
 332  *
 333  * Convert a NTDLL timeout into a timeval struct to send to the server.
 334  */
 335 void NTDLL_get_server_timeout( abs_time_t *when, const LARGE_INTEGER *timeout )
 336 {
 337     UINT remainder;
 338
 339     if (!timeout)  /* infinite timeout */
 340     {
 341         when->sec = when->usec = 0;
 342     }
 343     else if (timeout->QuadPart <= 0)  /* relative timeout */
 344     {
 345         struct timeval tv;
 346
 347         if (-timeout->QuadPart > (LONGLONG)INT_MAX * TICKSPERSEC)
 348             when->sec = when->usec = INT_MAX;
 349         else
 350         {
 351             ULONG sec = RtlEnlargedUnsignedDivide( -timeout->QuadPart, TICKSPERSEC, &remainder );
 352             gettimeofday( &tv, 0 );
 353             when->sec = tv.tv_sec + sec;
 354             if ((when->usec = tv.tv_usec + (remainder / 10)) >= 1000000)
 355             {
 356                 when->usec -= 1000000;
 357                 when->sec++;
 358             }
 359             if (when->sec < tv.tv_sec)  /* overflow */
 360                 when->sec = when->usec = INT_MAX;
 361         }
 362     }
 363     else  /* absolute time */
 364     {
 365         if (timeout->QuadPart < TICKS_1601_TO_1970)
 366             when->sec = when->usec = 0;
 367         else if (timeout->QuadPart > TICKS_1601_TO_UNIX_MAX)
 368             when->sec = when->usec = INT_MAX;
 369         else
 370         {
 371             when->sec = RtlEnlargedUnsignedDivide( timeout->QuadPart - TICKS_1601_TO_1970,
 372                                                    TICKSPERSEC, &remainder );
 373             when->usec = remainder / 10;
 374         }
 375     }
 376 }
 377
 378
 379 /******************************************************************************
 380  *       RtlTimeToTimeFields [NTDLL.@]
 381  *
 382  * Convert a time into a TIME_FIELDS structure.
 383  *
 384  * PARAMS
 385  *   liTime     [I] Time to convert.
 386  *   TimeFields [O] Destination for the converted time.
 387  *
 388  * RETURNS
 389  *   Nothing.
 390  */
 391 VOID WINAPI RtlTimeToTimeFields(
 392         const LARGE_INTEGER *liTime,
 393         PTIME_FIELDS TimeFields)
 394 {
 395         int SecondsInDay, DeltaYear;
 396         int LeapYear, CurMonth;
 397         long int Days;
 398         LONGLONG Time = liTime->QuadPart;
 399
 400         /* Extract millisecond from time and convert time into seconds */
 401         TimeFields->Milliseconds = (CSHORT) ((Time % TICKSPERSEC) / TICKSPERMSEC);
 402         Time = Time / TICKSPERSEC;
 403
 404         /* The native version of RtlTimeToTimeFields does not take leap seconds
 405          * into account */
 406
 407         /* Split the time into days and seconds within the day */
 408         Days = Time / SECSPERDAY;
 409         SecondsInDay = Time % SECSPERDAY;
 410
 411         /* compute time of day */
 412         TimeFields->Hour = (CSHORT) (SecondsInDay / SECSPERHOUR);
 413         SecondsInDay = SecondsInDay % SECSPERHOUR;
 414         TimeFields->Minute = (CSHORT) (SecondsInDay / SECSPERMIN);
 415         TimeFields->Second = (CSHORT) (SecondsInDay % SECSPERMIN);
 416
 417         /* compute day of week */
 418         TimeFields->Weekday = (CSHORT) ((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
 419
 420         /* compute year */
 421         /* FIXME: handle calendar modifications */
 422         TimeFields->Year = EPOCHYEAR;
 423         DeltaYear = Days / DAYSPERQUADRICENTENNIUM;
 424         TimeFields->Year += DeltaYear * 400;
 425         Days -= DeltaYear * DAYSPERQUADRICENTENNIUM;
 426         DeltaYear = Days / DAYSPERNORMALCENTURY;
 427         TimeFields->Year += DeltaYear * 100;
 428         Days -= DeltaYear * DAYSPERNORMALCENTURY;
 429         DeltaYear = Days / DAYSPERNORMALQUADRENNIUM;
 430         TimeFields->Year += DeltaYear * 4;
 431         Days -= DeltaYear * DAYSPERNORMALQUADRENNIUM;
 432         DeltaYear = Days / DAYSPERNORMALYEAR;
 433         TimeFields->Year += DeltaYear;
 434         Days -= DeltaYear * DAYSPERNORMALYEAR;
 435
 436         LeapYear = IsLeapYear(TimeFields->Year);
 437
 438         /* Compute month of year */
 439         CurMonth = 1;
 440         while (Days >= YearDays[LeapYear][CurMonth]) CurMonth++;
 441         TimeFields->Day = Days - YearDays[LeapYear][CurMonth-1] + 1;
 442         TimeFields->Month = CurMonth;
 443 }
 444
 445 /******************************************************************************
 446  *       RtlTimeFieldsToTime [NTDLL.@]
 447  *
 448  * Convert a TIME_FIELDS structure into a time.
 449  *
 450  * PARAMS
 451  *   ftTimeFields [I] TIME_FIELDS structure to convert.
 452  *   Time         [O] Destination for the converted time.
 453  *
 454  * RETURNS
 455  *   Success: TRUE.
 456  *   Failure: FALSE.
 457  */
 458 BOOLEAN WINAPI RtlTimeFieldsToTime(
 459         PTIME_FIELDS tfTimeFields,
 460         PLARGE_INTEGER Time)
 461 {
 462         int CurYear, DeltaYear;
 463         LONGLONG rcTime;
 464         TIME_FIELDS TimeFields = *tfTimeFields;
 465
 466         rcTime = 0;
 467
 468         /* FIXME: normalize the TIME_FIELDS structure here */
 469         while (TimeFields.Second >= SECSPERMIN)
 470         { NormalizeTimeFields(&TimeFields.Second, &TimeFields.Minute, SECSPERMIN);
 471         }
 472         while (TimeFields.Minute >= MINSPERHOUR)
 473         { NormalizeTimeFields(&TimeFields.Minute, &TimeFields.Hour, MINSPERHOUR);
 474         }
 475         while (TimeFields.Hour >= HOURSPERDAY)
 476         { NormalizeTimeFields(&TimeFields.Hour, &TimeFields.Day, HOURSPERDAY);
 477         }
 478         while (TimeFields.Day > MonthLengths[IsLeapYear(TimeFields.Year)][TimeFields.Month - 1])
 479         { NormalizeTimeFields(&TimeFields.Day, &TimeFields.Month,
 480                               MonthLengths[IsLeapYear(TimeFields.Year)][TimeFields.Month - 1]);
 481         }
 482         while (TimeFields.Month > MONSPERYEAR)
 483         { NormalizeTimeFields(&TimeFields.Month, &TimeFields.Year, MONSPERYEAR);
 484         }
 485
 486         /* FIXME: handle calendar corrections here */
 487         CurYear = TimeFields.Year - EPOCHYEAR;
 488         DeltaYear = CurYear / 400;
 489         CurYear -= DeltaYear * 400;
 490         rcTime += DeltaYear * DAYSPERQUADRICENTENNIUM;
 491         DeltaYear = CurYear / 100;
 492         CurYear -= DeltaYear * 100;
 493         rcTime += DeltaYear * DAYSPERNORMALCENTURY;
 494         DeltaYear = CurYear / 4;
 495         CurYear -= DeltaYear * 4;
 496         rcTime += DeltaYear * DAYSPERNORMALQUADRENNIUM;
 497         rcTime += CurYear * DAYSPERNORMALYEAR;
 498         rcTime += YearDays[IsLeapYear(TimeFields.Year)][TimeFields.Month - 1];
 499         rcTime += TimeFields.Day - 1;
 500         rcTime *= SECSPERDAY;
 501         rcTime += TimeFields.Hour * SECSPERHOUR + TimeFields.Minute * SECSPERMIN + TimeFields.Second;
 502         rcTime *= TICKSPERSEC;
 503         rcTime += TimeFields.Milliseconds * TICKSPERMSEC;
 504         Time->QuadPart = rcTime;
 505
 506         return TRUE;
 507 }
 508
 509 /***********************************************************************
 510  *       TIME_GetBias [internal]
 511  *
 512  * Helper function calculates delta local time from UTC.
 513  *
 514  * PARAMS
 515  *   utc [I] The current utc time.
 516  *   pdaylight [I] Local daylight.
 517  *
 518  * RETURNS
 519  *   The bias for the current timezone.
 520  */
 521 static int TIME_GetBias(time_t utc, int *pdaylight)
 522 {
 523     struct tm *ptm;
 524     static time_t last_utc;
 525     static int last_bias;
 526     static int last_daylight;
 527     int ret;
 528
 529     RtlEnterCriticalSection( &TIME_GetBias_section );
 530     if(utc == last_utc)
 531     {
 532         *pdaylight = last_daylight;
 533         ret = last_bias;
 534     } else
 535     {
 536         ptm = localtime(&utc);
 537         *pdaylight = last_daylight =
 538             ptm->tm_isdst; /* daylight for local timezone */
 539         ptm = gmtime(&utc);
 540         ptm->tm_isdst = *pdaylight; /* use local daylight, not that of Greenwich */
 541         last_utc = utc;
 542         ret = last_bias = (int)(utc-mktime(ptm));
 543     }
 544     RtlLeaveCriticalSection( &TIME_GetBias_section );
 545     return ret;
 546 }
 547
 548 /******************************************************************************
 549  *        RtlLocalTimeToSystemTime [NTDLL.@]
 550  *
 551  * Convert a local time into system time.
 552  *
 553  * PARAMS
 554  *   LocalTime  [I] Local time to convert.
 555  *   SystemTime [O] Destination for the converted time.
 556  *
 557  * RETURNS
 558  *   Success: STATUS_SUCCESS.
 559  *   Failure: An NTSTATUS error code indicating the problem.
 560  */
 561 NTSTATUS WINAPI RtlLocalTimeToSystemTime( const LARGE_INTEGER *LocalTime,
 562                                           PLARGE_INTEGER SystemTime)
 563 {
 564     time_t gmt;
 565     int bias, daylight;
 566
 567     TRACE("(%p, %p)\n", LocalTime, SystemTime);
 568
 569     gmt = time(NULL);
 570     bias = TIME_GetBias(gmt, &daylight);
 571
 572     SystemTime->QuadPart = LocalTime->QuadPart - bias * (LONGLONG)10000000;
 573     return STATUS_SUCCESS;
 574 }
 575
 576 /******************************************************************************
 577  *       RtlSystemTimeToLocalTime [NTDLL.@]
 578  *
 579  * Convert a system time into a local time.
 580  *
 581  * PARAMS
 582  *   SystemTime [I] System time to convert.
 583  *   LocalTime  [O] Destination for the converted time.
 584  *
 585  * RETURNS
 586  *   Success: STATUS_SUCCESS.
 587  *   Failure: An NTSTATUS error code indicating the problem.
 588  */
 589 NTSTATUS WINAPI RtlSystemTimeToLocalTime( const LARGE_INTEGER *SystemTime,
 590                                           PLARGE_INTEGER LocalTime )
 591 {
 592     time_t gmt;
 593     int bias, daylight;
 594
 595     TRACE("(%p, %p)\n", SystemTime, LocalTime);
 596
 597     gmt = time(NULL);
 598     bias = TIME_GetBias(gmt, &daylight);
 599
 600     LocalTime->QuadPart = SystemTime->QuadPart + bias * (LONGLONG)10000000;
 601     return STATUS_SUCCESS;
 602 }
 603
 604 /******************************************************************************
 605  *       RtlTimeToSecondsSince1970 [NTDLL.@]
 606  *
 607  * Convert a time into a count of seconds since 1970.
 608  *
 609  * PARAMS
 610  *   Time    [I] Time to convert.
 611  *   Seconds [O] Destination for the converted time.
 612  *
 613  * RETURNS
 614  *   Success: TRUE.
 615  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 616  */
 617 BOOLEAN WINAPI RtlTimeToSecondsSince1970( const LARGE_INTEGER *Time, LPDWORD Seconds )
 618 {
 619     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 620     tmp = RtlLargeIntegerDivide( tmp, 10000000, NULL );
 621     tmp -= SECS_1601_TO_1970;
 622     if (tmp > 0xffffffff) return FALSE;
 623     *Seconds = (DWORD)tmp;
 624     return TRUE;
 625 }
 626
 627 /******************************************************************************
 628  *       RtlTimeToSecondsSince1980 [NTDLL.@]
 629  *
 630  * Convert a time into a count of seconds since 1980.
 631  *
 632  * PARAMS
 633  *   Time    [I] Time to convert.
 634  *   Seconds [O] Destination for the converted time.
 635  *
 636  * RETURNS
 637  *   Success: TRUE.
 638  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 639  */
 640 BOOLEAN WINAPI RtlTimeToSecondsSince1980( const LARGE_INTEGER *Time, LPDWORD Seconds )
 641 {
 642     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 643     tmp = RtlLargeIntegerDivide( tmp, 10000000, NULL );
 644     tmp -= SECS_1601_TO_1980;
 645     if (tmp > 0xffffffff) return FALSE;
 646     *Seconds = (DWORD)tmp;
 647     return TRUE;
 648 }
 649
 650 /******************************************************************************
 651  *       RtlSecondsSince1970ToTime [NTDLL.@]
 652  *
 653  * Convert a count of seconds since 1970 to a time.
 654  *
 655  * PARAMS
 656  *   Seconds [I] Time to convert.
 657  *   Time    [O] Destination for the converted time.
 658  *
 659  * RETURNS
 660  *   Nothing.
 661  */
 662 void WINAPI RtlSecondsSince1970ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 663 {
 664     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 665     Time->u.LowPart  = (DWORD)secs;
 666     Time->u.HighPart = (DWORD)(secs >> 32);
 667 }
 668
 669 /******************************************************************************
 670  *       RtlSecondsSince1980ToTime [NTDLL.@]
 671  *
 672  * Convert a count of seconds since 1980 to a time.
 673  *
 674  * PARAMS
 675  *   Seconds [I] Time to convert.
 676  *   Time    [O] Destination for the converted time.
 677  *
 678  * RETURNS
 679  *   Nothing.
 680  */
 681 void WINAPI RtlSecondsSince1980ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 682 {
 683     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1980;
 684     Time->u.LowPart  = (DWORD)secs;
 685     Time->u.HighPart = (DWORD)(secs >> 32);
 686 }
 687
 688 /******************************************************************************
 689  *       RtlTimeToElapsedTimeFields [NTDLL.@]
 690  *
 691  * Convert a time to a count of elapsed seconds.
 692  *
 693  * PARAMS
 694  *   Time       [I] Time to convert.
 695  *   TimeFields [O] Destination for the converted time.
 696  *
 697  * RETURNS
 698  *   Nothing.
 699  */
 700 void WINAPI RtlTimeToElapsedTimeFields( const LARGE_INTEGER *Time, PTIME_FIELDS TimeFields )
 701 {
 702     LONGLONG time;
 703     UINT rem;
 704
 705     time = RtlExtendedLargeIntegerDivide( Time->QuadPart, TICKSPERSEC, &rem );
 706     TimeFields->Milliseconds = rem / TICKSPERMSEC;
 707
 708     /* time is now in seconds */
 709     TimeFields->Year  = 0;
 710     TimeFields->Month = 0;
 711     TimeFields->Day   = RtlExtendedLargeIntegerDivide( time, SECSPERDAY, &rem );
 712
 713     /* rem is now the remaining seconds in the last day */
 714     TimeFields->Second = rem % 60;
 715     rem /= 60;
 716     TimeFields->Minute = rem % 60;
 717     TimeFields->Hour = rem / 60;
 718 }
 719
 720 /***********************************************************************
 721  *       NtQuerySystemTime [NTDLL.@]
 722  *       ZwQuerySystemTime [NTDLL.@]
 723  *
 724  * Get the current system time.
 725  *
 726  * PARAMS
 727  *   Time [O] Destination for the current system time.
 728  *
 729  * RETURNS
 730  *   Success: STATUS_SUCCESS.
 731  *   Failure: An NTSTATUS error code indicating the problem.
 732  */
 733 NTSTATUS WINAPI NtQuerySystemTime( PLARGE_INTEGER Time )
 734 {
 735     struct timeval now;
 736
 737     gettimeofday( &now, 0 );
 738     Time->QuadPart = now.tv_sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 739     Time->QuadPart += now.tv_usec * 10;
 740     return STATUS_SUCCESS;
 741 }
 742
 743 /***********************************************************************
 744  *        TIME_GetTZAsStr [internal]
 745  *
 746  * Helper function that returns the given timezone as a string.
 747  *
 748  * PARAMS
 749  *   utc [I] The current utc time.
 750  *   bias [I] The bias of the current timezone.
 751  *   dst [I] ??
 752  *
 753  * RETURNS
 754  *   Timezone name.
 755  *
 756  * NOTES:
 757  *   This could be done with a hash table instead of merely iterating through a
 758  *   table, however with the small amount of entries (60 or so) I didn't think
 759  *   it was worth it.
 760  */
 761 static const WCHAR* TIME_GetTZAsStr (time_t utc, int bias, int dst)
 762 {
 763    char psTZName[7];
 764    struct tm *ptm = localtime(&utc);
 765    unsigned int i;
 766
 767    if (!strftime (psTZName, 7, "%Z", ptm))
 768       return (NULL);
 769
 770    for (i=0; i<(sizeof(TZ_INFO) / sizeof(struct tagTZ_INFO)); i++)
 771    {
 772       if ( strcmp(TZ_INFO[i].psTZFromUnix, psTZName) == 0 &&
 773            TZ_INFO[i].bias == bias &&
 774            TZ_INFO[i].dst == dst
 775          )
 776             return TZ_INFO[i].psTZWindows;
 777    }
 778    FIXME("Can't match system time zone name \"%s\" to an entry in TZ_INFO\n",psTZName);
 779    FIXME(" Please add appropriate entry to TZ_INFO and submit as patch to wine-patches\n");
 780    return NULL;
 781 }
 782
 783 /***********************************************************************
 784  *      RtlQueryTimeZoneInformation [NTDLL.@]
 785  *
 786  * Get information about the current timezone.
 787  *
 788  * PARAMS
 789  *   tzinfo [O] Destination for the retrieved timezone info.
 790  *
 791  * RETURNS
 792  *   Success: STATUS_SUCCESS.
 793  *   Failure: An NTSTATUS error code indicating the problem.
 794  */
 795 NTSTATUS WINAPI RtlQueryTimeZoneInformation(LPTIME_ZONE_INFORMATION tzinfo)
 796 {
 797     time_t gmt;
 798     int bias, daylight;
 799     const WCHAR *psTZ;
 800
 801     memset(tzinfo, 0, sizeof(TIME_ZONE_INFORMATION));
 802
 803     gmt = time(NULL);
 804     bias = TIME_GetBias(gmt, &daylight);
 805
 806     tzinfo->Bias = -bias / 60;
 807     tzinfo->StandardBias = 0;
 808     tzinfo->DaylightBias = -60;
 809     psTZ = TIME_GetTZAsStr (gmt, (-bias/60), daylight);
 810     if (psTZ) strcpyW( tzinfo->StandardName, psTZ );
 811     return STATUS_SUCCESS;
 812 }
 813
 814 /***********************************************************************
 815  *       RtlSetTimeZoneInformation [NTDLL.@]
 816  *
 817  * Set the current time zone information.
 818  *
 819  * PARAMS
 820  *   tzinfo [I] Timezone information to set.
 821  *
 822  * RETURNS
 823  *   Success: STATUS_SUCCESS.
 824  *   Failure: An NTSTATUS error code indicating the problem.
 825  *
 826  * BUGS
 827  *   Uses the obsolete unix timezone structure and tz_dsttime member.
 828  */
 829 NTSTATUS WINAPI RtlSetTimeZoneInformation( const TIME_ZONE_INFORMATION *tzinfo )
 830 {
 831 #ifdef HAVE_SETTIMEOFDAY
 832     struct timezone tz;
 833
 834     tz.tz_minuteswest = tzinfo->Bias;
 835 #ifdef DST_NONE
 836     tz.tz_dsttime = DST_NONE;
 837 #else
 838     tz.tz_dsttime = 0;
 839 #endif
 840     if(!settimeofday(NULL, &tz))
 841         return STATUS_SUCCESS;
 842 #endif
 843     return STATUS_PRIVILEGE_NOT_HELD;
 844 }
 845
 846 /***********************************************************************
 847  *        NtSetSystemTime [NTDLL.@]
 848  *        ZwSetSystemTime [NTDLL.@]
 849  *
 850  * Set the system time.
 851  *
 852  * PARAMS
 853  *   NewTime [I] The time to set.
 854  *   OldTime [O] Optional destination for the previous system time.
 855  *
 856  * RETURNS
 857  *   Success: STATUS_SUCCESS.
 858  *   Failure: An NTSTATUS error code indicating the problem.
 859  */
 860 NTSTATUS WINAPI NtSetSystemTime(const LARGE_INTEGER *NewTime, LARGE_INTEGER *OldTime)
 861 {
 862     TIME_FIELDS tf;
 863     struct timeval tv;
 864     struct timezone tz;
 865     struct tm t;
 866     time_t sec, oldsec;
 867     int dst, bias;
 868     int err;
 869
 870     /* Return the old time if necessary */
 871     if(OldTime)
 872         NtQuerySystemTime(OldTime);
 873
 874     RtlTimeToTimeFields(NewTime, &tf);
 875
 876     /* call gettimeofday to get the current timezone */
 877     gettimeofday(&tv, &tz);
 878     oldsec = tv.tv_sec;
 879     /* get delta local time from utc */
 880     bias = TIME_GetBias(oldsec, &dst);
 881
 882     /* get the number of seconds */
 883     t.tm_sec = tf.Second;
 884     t.tm_min = tf.Minute;
 885     t.tm_hour = tf.Hour;
 886     t.tm_mday = tf.Day;
 887     t.tm_mon = tf.Month - 1;
 888     t.tm_year = tf.Year - 1900;
 889     t.tm_isdst = dst;
 890     sec = mktime (&t);
 891     /* correct for timezone and daylight */
 892     sec += bias;
 893
 894     /* set the new time */
 895     tv.tv_sec = sec;
 896     tv.tv_usec = tf.Milliseconds * 1000;
 897
 898     /* error and sanity check*/
 899     if(sec == (time_t)-1 || abs((int)(sec-oldsec)) > SETTIME_MAX_ADJUST) {
 900         err = 2;
 901     } else {
 902 #ifdef HAVE_SETTIMEOFDAY
 903         err = settimeofday(&tv, NULL); /* 0 is OK, -1 is error */
 904         if(err == 0)
 905             return STATUS_SUCCESS;
 906 #else
 907         err = 1;
 908 #endif
 909     }
 910
 911     ERR("Cannot set time to %d/%d/%d %d:%d:%d Time adjustment %ld %s\n",
 912             tf.Year, tf.Month, tf.Day, tf.Hour, tf.Minute, tf.Second,
 913             (long)(sec-oldsec),
 914             err == -1 ? "No Permission"
 915                       : sec == (time_t)-1 ? "" : "is too large." );
 916
 917     if(err == 2)
 918         return STATUS_INVALID_PARAMETER;
 919     else if(err == -1)
 920         return STATUS_PRIVILEGE_NOT_HELD;
 921     else
 922         return STATUS_NOT_IMPLEMENTED;
 923 }