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 #define DAYSPERQUADRICENTENNIUM (365 * 400 + 97)
 276 #define DAYSPERNORMALCENTURY (365 * 100 + 24)
 277 #define DAYSPERNORMALQUADRENNIUM (365 * 4 + 1)
 278
 279 /* 1601 to 1970 is 369 years plus 89 leap days */
 280 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
 281 #define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
 282 /* 1601 to 1980 is 379 years plus 91 leap days */
 283 #define SECS_1601_TO_1980  ((379 * 365 + 91) * (ULONGLONG)SECSPERDAY)
 284 #define TICKS_1601_TO_1980 (SECS_1601_TO_1980 * TICKSPERSEC)
 285
 286
 287 static const int YearLengths[2] = {DAYSPERNORMALYEAR, DAYSPERLEAPYEAR};
 288 static const int MonthLengths[2][MONSPERYEAR] =
 289 {
 290         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
 291         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
 292 };
 293
 294 static inline int IsLeapYear(int Year)
 295 {
 296         return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ? 1 : 0;
 297 }
 298
 299 static inline void NormalizeTimeFields(CSHORT *FieldToNormalize, CSHORT *CarryField,int Modulus)
 300 {
 301         *FieldToNormalize = (CSHORT) (*FieldToNormalize - Modulus);
 302         *CarryField = (CSHORT) (*CarryField + 1);
 303 }
 304
 305 /***********************************************************************
 306  *              NTDLL_get_server_timeout
 307  *
 308  * Convert a NTDLL timeout into a timeval struct to send to the server.
 309  */
 310 void NTDLL_get_server_timeout( abs_time_t *when, const LARGE_INTEGER *timeout )
 311 {
 312     UINT remainder;
 313
 314     if (!timeout)  /* infinite timeout */
 315     {
 316         when->sec = when->usec = 0;
 317     }
 318     else if (timeout->QuadPart <= 0)  /* relative timeout */
 319     {
 320         struct timeval tv;
 321         ULONG sec = RtlEnlargedUnsignedDivide( -timeout->QuadPart, TICKSPERSEC, &remainder );
 322         gettimeofday( &tv, 0 );
 323         when->sec = tv.tv_sec + sec;
 324         if ((when->usec = tv.tv_usec + (remainder / 10)) >= 1000000)
 325         {
 326             when->usec -= 1000000;
 327             when->sec++;
 328         }
 329     }
 330     else  /* absolute time */
 331     {
 332         when->sec = RtlEnlargedUnsignedDivide( timeout->QuadPart - TICKS_1601_TO_1970,
 333                                                   TICKSPERSEC, &remainder );
 334         when->usec = remainder / 10;
 335     }
 336 }
 337
 338
 339 /******************************************************************************
 340  *       RtlTimeToTimeFields [NTDLL.@]
 341  *
 342  * Convert a time into a TIME_FIELDS structure.
 343  *
 344  * PARAMS
 345  *   liTime     [I] Time to convert.
 346  *   TimeFields [O] Destination for the converted time.
 347  *
 348  * RETURNS
 349  *   Nothing.
 350  */
 351 VOID WINAPI RtlTimeToTimeFields(
 352         const LARGE_INTEGER *liTime,
 353         PTIME_FIELDS TimeFields)
 354 {
 355         const int *Months;
 356         int SecondsInDay, DeltaYear;
 357         int LeapYear, CurMonth;
 358         long int Days;
 359         LONGLONG Time = liTime->QuadPart;
 360
 361         /* Extract millisecond from time and convert time into seconds */
 362         TimeFields->Milliseconds = (CSHORT) ((Time % TICKSPERSEC) / TICKSPERMSEC);
 363         Time = Time / TICKSPERSEC;
 364
 365         /* The native version of RtlTimeToTimeFields does not take leap seconds
 366          * into account */
 367
 368         /* Split the time into days and seconds within the day */
 369         Days = Time / SECSPERDAY;
 370         SecondsInDay = Time % SECSPERDAY;
 371
 372         /* compute time of day */
 373         TimeFields->Hour = (CSHORT) (SecondsInDay / SECSPERHOUR);
 374         SecondsInDay = SecondsInDay % SECSPERHOUR;
 375         TimeFields->Minute = (CSHORT) (SecondsInDay / SECSPERMIN);
 376         TimeFields->Second = (CSHORT) (SecondsInDay % SECSPERMIN);
 377
 378         /* compute day of week */
 379         TimeFields->Weekday = (CSHORT) ((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
 380
 381         /* compute year */
 382         /* FIXME: handle calendar modifications */
 383         TimeFields->Year = EPOCHYEAR;
 384         DeltaYear = Days / DAYSPERQUADRICENTENNIUM;
 385         TimeFields->Year += DeltaYear * 400;
 386         Days -= DeltaYear * DAYSPERQUADRICENTENNIUM;
 387         DeltaYear = Days / DAYSPERNORMALCENTURY;
 388         TimeFields->Year += DeltaYear * 100;
 389         Days -= DeltaYear * DAYSPERNORMALCENTURY;
 390         DeltaYear = Days / DAYSPERNORMALQUADRENNIUM;
 391         TimeFields->Year += DeltaYear * 4;
 392         Days -= DeltaYear * DAYSPERNORMALQUADRENNIUM;
 393         DeltaYear = Days / DAYSPERNORMALYEAR;
 394         TimeFields->Year += DeltaYear;
 395         Days -= DeltaYear * DAYSPERNORMALYEAR;
 396
 397         LeapYear = IsLeapYear(TimeFields->Year);
 398
 399         /* Compute month of year */
 400         Months = MonthLengths[LeapYear];
 401         for (CurMonth = 0; Days >= (long) Months[CurMonth]; CurMonth++)
 402           Days = Days - (long) Months[CurMonth];
 403         TimeFields->Month = (CSHORT) (CurMonth + 1);
 404         TimeFields->Day = (CSHORT) (Days + 1);
 405 }
 406
 407 /******************************************************************************
 408  *       RtlTimeFieldsToTime [NTDLL.@]
 409  *
 410  * Convert a TIME_FIELDS structure into a time.
 411  *
 412  * PARAMS
 413  *   ftTimeFields [I] TIME_FIELDS structure to convert.
 414  *   Time         [O] Destination for the converted time.
 415  *
 416  * RETURNS
 417  *   Success: TRUE.
 418  *   Failure: FALSE.
 419  */
 420 BOOLEAN WINAPI RtlTimeFieldsToTime(
 421         PTIME_FIELDS tfTimeFields,
 422         PLARGE_INTEGER Time)
 423 {
 424         int CurYear, CurMonth;
 425         LONGLONG rcTime;
 426         TIME_FIELDS TimeFields = *tfTimeFields;
 427
 428         rcTime = 0;
 429
 430         /* FIXME: normalize the TIME_FIELDS structure here */
 431         while (TimeFields.Second >= SECSPERMIN)
 432         { NormalizeTimeFields(&TimeFields.Second, &TimeFields.Minute, SECSPERMIN);
 433         }
 434         while (TimeFields.Minute >= MINSPERHOUR)
 435         { NormalizeTimeFields(&TimeFields.Minute, &TimeFields.Hour, MINSPERHOUR);
 436         }
 437         while (TimeFields.Hour >= HOURSPERDAY)
 438         { NormalizeTimeFields(&TimeFields.Hour, &TimeFields.Day, HOURSPERDAY);
 439         }
 440         while (TimeFields.Day > MonthLengths[IsLeapYear(TimeFields.Year)][TimeFields.Month - 1])
 441         { NormalizeTimeFields(&TimeFields.Day, &TimeFields.Month, SECSPERMIN);
 442         }
 443         while (TimeFields.Month > MONSPERYEAR)
 444         { NormalizeTimeFields(&TimeFields.Month, &TimeFields.Year, MONSPERYEAR);
 445         }
 446
 447         /* FIXME: handle calendar corrections here */
 448         for (CurYear = EPOCHYEAR; CurYear < TimeFields.Year; CurYear++)
 449         { rcTime += YearLengths[IsLeapYear(CurYear)];
 450         }
 451         for (CurMonth = 1; CurMonth < TimeFields.Month; CurMonth++)
 452         { rcTime += MonthLengths[IsLeapYear(CurYear)][CurMonth - 1];
 453         }
 454         rcTime += TimeFields.Day - 1;
 455         rcTime *= SECSPERDAY;
 456         rcTime += TimeFields.Hour * SECSPERHOUR + TimeFields.Minute * SECSPERMIN + TimeFields.Second;
 457         rcTime *= TICKSPERSEC;
 458         rcTime += TimeFields.Milliseconds * TICKSPERMSEC;
 459         Time->QuadPart = rcTime;
 460
 461         return TRUE;
 462 }
 463 /************ end of code by Rex Jolliff (rex@lvcablemodem.com) ***************/
 464
 465 /******************************************************************************
 466  *        RtlLocalTimeToSystemTime [NTDLL.@]
 467  *
 468  * Convert a local time into system time.
 469  *
 470  * PARAMS
 471  *   LocalTime  [I] Local time to convert.
 472  *   SystemTime [O] Destination for the converted time.
 473  *
 474  * RETURNS
 475  *   Success: STATUS_SUCCESS.
 476  *   Failure: An NTSTATUS error code indicating the problem.
 477  */
 478 NTSTATUS WINAPI RtlLocalTimeToSystemTime( const LARGE_INTEGER *LocalTime,
 479                                           PLARGE_INTEGER SystemTime)
 480 {
 481     TIME_ZONE_INFORMATION tzinfo;
 482
 483     TRACE("(%p, %p)\n", LocalTime, SystemTime);
 484
 485     RtlQueryTimeZoneInformation(&tzinfo);
 486     SystemTime->QuadPart = LocalTime->QuadPart + tzinfo.Bias * 60 * (LONGLONG)10000000;
 487     return STATUS_SUCCESS;
 488 }
 489
 490 /******************************************************************************
 491  *       RtlSystemTimeToLocalTime [NTDLL.@]
 492  *
 493  * Convert a system time into a local time.
 494  *
 495  * PARAMS
 496  *   SystemTime [I] System time to convert.
 497  *   LocalTime  [O] Destination for the converted time.
 498  *
 499  * RETURNS
 500  *   Success: STATUS_SUCCESS.
 501  *   Failure: An NTSTATUS error code indicating the problem.
 502  */
 503 NTSTATUS WINAPI RtlSystemTimeToLocalTime( const LARGE_INTEGER *SystemTime,
 504                                           PLARGE_INTEGER LocalTime )
 505 {
 506     TIME_ZONE_INFORMATION tzinfo;
 507
 508     TRACE("(%p, %p)\n", SystemTime, LocalTime);
 509
 510     RtlQueryTimeZoneInformation(&tzinfo);
 511     LocalTime->QuadPart = SystemTime->QuadPart - tzinfo.Bias * 60 * (LONGLONG)10000000;
 512     return STATUS_SUCCESS;
 513 }
 514
 515 /******************************************************************************
 516  *       RtlTimeToSecondsSince1970 [NTDLL.@]
 517  *
 518  * Convert a time into a count of seconds since 1970.
 519  *
 520  * PARAMS
 521  *   Time    [I] Time to convert.
 522  *   Seconds [O] Destination for the converted time.
 523  *
 524  * RETURNS
 525  *   Success: TRUE.
 526  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 527  */
 528 BOOLEAN WINAPI RtlTimeToSecondsSince1970( const LARGE_INTEGER *Time, LPDWORD Seconds )
 529 {
 530     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 531     tmp = RtlLargeIntegerDivide( tmp, 10000000, NULL );
 532     tmp -= SECS_1601_TO_1970;
 533     if (tmp > 0xffffffff) return FALSE;
 534     *Seconds = (DWORD)tmp;
 535     return TRUE;
 536 }
 537
 538 /******************************************************************************
 539  *       RtlTimeToSecondsSince1980 [NTDLL.@]
 540  *
 541  * Convert a time into a count of seconds since 1980.
 542  *
 543  * PARAMS
 544  *   Time    [I] Time to convert.
 545  *   Seconds [O] Destination for the converted time.
 546  *
 547  * RETURNS
 548  *   Success: TRUE.
 549  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 550  */
 551 BOOLEAN WINAPI RtlTimeToSecondsSince1980( const LARGE_INTEGER *Time, LPDWORD Seconds )
 552 {
 553     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 554     tmp = RtlLargeIntegerDivide( tmp, 10000000, NULL );
 555     tmp -= SECS_1601_TO_1980;
 556     if (tmp > 0xffffffff) return FALSE;
 557     *Seconds = (DWORD)tmp;
 558     return TRUE;
 559 }
 560
 561 /******************************************************************************
 562  *       RtlSecondsSince1970ToTime [NTDLL.@]
 563  *
 564  * Convert a count of seconds since 1970 to a time.
 565  *
 566  * PARAMS
 567  *   Seconds [I] Time to convert.
 568  *   Time    [O] Destination for the converted time.
 569  *
 570  * RETURNS
 571  *   Nothing.
 572  */
 573 void WINAPI RtlSecondsSince1970ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 574 {
 575     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 576     Time->u.LowPart  = (DWORD)secs;
 577     Time->u.HighPart = (DWORD)(secs >> 32);
 578 }
 579
 580 /******************************************************************************
 581  *       RtlSecondsSince1980ToTime [NTDLL.@]
 582  *
 583  * Convert a count of seconds since 1980 to a time.
 584  *
 585  * PARAMS
 586  *   Seconds [I] Time to convert.
 587  *   Time    [O] Destination for the converted time.
 588  *
 589  * RETURNS
 590  *   Nothing.
 591  */
 592 void WINAPI RtlSecondsSince1980ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 593 {
 594     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1980;
 595     Time->u.LowPart  = (DWORD)secs;
 596     Time->u.HighPart = (DWORD)(secs >> 32);
 597 }
 598
 599 /******************************************************************************
 600  *       RtlTimeToElapsedTimeFields [NTDLL.@]
 601  *
 602  * Convert a time to a count of elapsed seconds.
 603  *
 604  * PARAMS
 605  *   Time       [I] Time to convert.
 606  *   TimeFields [O] Destination for the converted time.
 607  *
 608  * RETURNS
 609  *   Nothing.
 610  */
 611 void WINAPI RtlTimeToElapsedTimeFields( const LARGE_INTEGER *Time, PTIME_FIELDS TimeFields )
 612 {
 613     LONGLONG time;
 614     UINT rem;
 615
 616     time = RtlExtendedLargeIntegerDivide( Time->QuadPart, TICKSPERSEC, &rem );
 617     TimeFields->Milliseconds = rem / TICKSPERMSEC;
 618
 619     /* time is now in seconds */
 620     TimeFields->Year  = 0;
 621     TimeFields->Month = 0;
 622     TimeFields->Day   = RtlExtendedLargeIntegerDivide( time, SECSPERDAY, &rem );
 623
 624     /* rem is now the remaining seconds in the last day */
 625     TimeFields->Second = rem % 60;
 626     rem /= 60;
 627     TimeFields->Minute = rem % 60;
 628     TimeFields->Hour = rem / 60;
 629 }
 630
 631 /***********************************************************************
 632  *       NtQuerySystemTime [NTDLL.@]
 633  *       ZwQuerySystemTime [NTDLL.@]
 634  *
 635  * Get the current system time.
 636  *
 637  * PARAMS
 638  *   Time [O] Destination for the current system time.
 639  *
 640  * RETURNS
 641  *   Success: STATUS_SUCCESS.
 642  *   Failure: An NTSTATUS error code indicating the problem.
 643  */
 644 NTSTATUS WINAPI NtQuerySystemTime( PLARGE_INTEGER Time )
 645 {
 646     struct timeval now;
 647
 648     gettimeofday( &now, 0 );
 649     Time->QuadPart = now.tv_sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 650     Time->QuadPart += now.tv_usec * 10;
 651     return STATUS_SUCCESS;
 652 }
 653
 654 /***********************************************************************
 655  *       TIME_GetBias [internal]
 656  *
 657  * Helper function calculates delta local time from UTC.
 658  *
 659  * PARAMS
 660  *   utc [I] The current utc time.
 661  *   pdaylight [I] Local daylight.
 662  *
 663  * RETURNS
 664  *   The bias for the current timezone.
 665  */
 666 static int TIME_GetBias(time_t utc, int *pdaylight)
 667 {
 668     struct tm *ptm = localtime(&utc);
 669     *pdaylight = ptm->tm_isdst; /* daylight for local timezone */
 670     ptm = gmtime(&utc);
 671     ptm->tm_isdst = *pdaylight; /* use local daylight, not that of Greenwich */
 672     return (int)(utc-mktime(ptm));
 673 }
 674
 675 /***********************************************************************
 676  *        TIME_GetTZAsStr [internal]
 677  *
 678  * Helper function that returns the given timezone as a string.
 679  *
 680  * PARAMS
 681  *   utc [I] The current utc time.
 682  *   bias [I] The bias of the current timezone.
 683  *   dst [I] ??
 684  *
 685  * RETURNS
 686  *   Timezone name.
 687  *
 688  * NOTES:
 689  *   This could be done with a hash table instead of merely iterating through a
 690  *   table, however with the small amount of entries (60 or so) I didn't think
 691  *   it was worth it.
 692  */
 693 static const WCHAR* TIME_GetTZAsStr (time_t utc, int bias, int dst)
 694 {
 695    char psTZName[7];
 696    struct tm *ptm = localtime(&utc);
 697    int i;
 698
 699    if (!strftime (psTZName, 7, "%Z", ptm))
 700       return (NULL);
 701
 702    for (i=0; i<(sizeof(TZ_INFO) / sizeof(struct tagTZ_INFO)); i++)
 703    {
 704       if ( strcmp(TZ_INFO[i].psTZFromUnix, psTZName) == 0 &&
 705            TZ_INFO[i].bias == bias &&
 706            TZ_INFO[i].dst == dst
 707          )
 708             return TZ_INFO[i].psTZWindows;
 709    }
 710
 711    return NULL;
 712 }
 713
 714 /***********************************************************************
 715  *      RtlQueryTimeZoneInformation [NTDLL.@]
 716  *
 717  * Get information about the current timezone.
 718  *
 719  * PARAMS
 720  *   tzinfo [O] Destination for the retrieved timezone info.
 721  *
 722  * RETURNS
 723  *   Success: STATUS_SUCCESS.
 724  *   Failure: An NTSTATUS error code indicating the problem.
 725  */
 726 NTSTATUS WINAPI RtlQueryTimeZoneInformation(LPTIME_ZONE_INFORMATION tzinfo)
 727 {
 728     time_t gmt;
 729     int bias, daylight;
 730     const WCHAR *psTZ;
 731
 732     memset(tzinfo, 0, sizeof(TIME_ZONE_INFORMATION));
 733
 734     gmt = time(NULL);
 735     bias = TIME_GetBias(gmt, &daylight);
 736
 737     tzinfo->Bias = -bias / 60;
 738     tzinfo->StandardBias = 0;
 739     tzinfo->DaylightBias = -60;
 740     psTZ = TIME_GetTZAsStr (gmt, (-bias/60), daylight);
 741     if (psTZ) strcpyW( tzinfo->StandardName, psTZ );
 742     return STATUS_SUCCESS;
 743 }
 744
 745 /***********************************************************************
 746  *       RtlSetTimeZoneInformation [NTDLL.@]
 747  *
 748  * Set the current time zone information.
 749  *
 750  * PARAMS
 751  *   tzinfo [I] Timezone information to set.
 752  *
 753  * RETURNS
 754  *   Success: STATUS_SUCCESS.
 755  *   Failure: An NTSTATUS error code indicating the problem.
 756  *
 757  * BUGS
 758  *   Uses the obsolete unix timezone structure and tz_dsttime member.
 759  */
 760 NTSTATUS WINAPI RtlSetTimeZoneInformation( const TIME_ZONE_INFORMATION *tzinfo )
 761 {
 762     struct timezone tz;
 763
 764     tz.tz_minuteswest = tzinfo->Bias;
 765 #ifdef DST_NONE
 766     tz.tz_dsttime = DST_NONE;
 767 #else
 768     tz.tz_dsttime = 0;
 769 #endif
 770     if(!settimeofday(NULL, &tz))
 771         return STATUS_SUCCESS;
 772     return STATUS_PRIVILEGE_NOT_HELD;
 773 }
 774
 775 /***********************************************************************
 776  *        NtSetSystemTime [NTDLL.@]
 777  *        ZwSetSystemTime [NTDLL.@]
 778  *
 779  * Set the system time.
 780  *
 781  * PARAMS
 782  *   NewTime [I] The time to set.
 783  *   OldTime [O] Optional destination for the previous system time.
 784  *
 785  * RETURNS
 786  *   Success: STATUS_SUCCESS.
 787  *   Failure: An NTSTATUS error code indicating the problem.
 788  */
 789 NTSTATUS WINAPI NtSetSystemTime(const LARGE_INTEGER *NewTime, LARGE_INTEGER *OldTime)
 790 {
 791     TIME_FIELDS tf;
 792     struct timeval tv;
 793     struct timezone tz;
 794     struct tm t;
 795     time_t sec, oldsec;
 796     int dst, bias;
 797     int err;
 798
 799     /* Return the old time if necessary */
 800     if(OldTime)
 801         NtQuerySystemTime(OldTime);
 802
 803     RtlTimeToTimeFields(NewTime, &tf);
 804
 805     /* call gettimeofday to get the current timezone */
 806     gettimeofday(&tv, &tz);
 807     oldsec = tv.tv_sec;
 808     /* get delta local time from utc */
 809     bias = TIME_GetBias(oldsec, &dst);
 810
 811     /* get the number of seconds */
 812     t.tm_sec = tf.Second;
 813     t.tm_min = tf.Minute;
 814     t.tm_hour = tf.Hour;
 815     t.tm_mday = tf.Day;
 816     t.tm_mon = tf.Month - 1;
 817     t.tm_year = tf.Year - 1900;
 818     t.tm_isdst = dst;
 819     sec = mktime (&t);
 820     /* correct for timezone and daylight */
 821     sec += bias;
 822
 823     /* set the new time */
 824     tv.tv_sec = sec;
 825     tv.tv_usec = tf.Milliseconds * 1000;
 826
 827     /* error and sanity check*/
 828     if(sec == (time_t)-1 || abs((int)(sec-oldsec)) > SETTIME_MAX_ADJUST) {
 829         err = 2;
 830     } else {
 831 #ifdef HAVE_SETTIMEOFDAY
 832         err = settimeofday(&tv, NULL); /* 0 is OK, -1 is error */
 833         if(err == 0)
 834             return STATUS_SUCCESS;
 835 #else
 836         err = 1;
 837 #endif
 838     }
 839
 840     ERR("Cannot set time to %d/%d/%d %d:%d:%d Time adjustment %ld %s\n",
 841             tf.Year, tf.Month, tf.Day, tf.Hour, tf.Minute, tf.Second,
 842             (long)(sec-oldsec),
 843             err == -1 ? "No Permission"
 844                       : sec == (time_t)-1 ? "" : "is too large." );
 845
 846     if(err == 2)
 847         return STATUS_INVALID_PARAMETER;
 848     else if(err == -1)
 849         return STATUS_PRIVILEGE_NOT_HELD;
 850     else
 851         return STATUS_NOT_IMPLEMENTED;
 852 }