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