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