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