dlls/ntdll/time.c

   1 /*
   2  * Nt time functions.
   3  *
   4  * RtlTimeToTimeFields, RtlTimeFieldsToTime and defines are taken from ReactOS and
   5  * adapted to wine with special permissions of the author. This code is
   6  * Copyright 2002 Rex Jolliff (rex@lvcablemodem.com)
   7  *
   8  * Copyright 1999 Juergen Schmied
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include "config.h"
  26 #include "wine/port.h"
  27
  28 #include <stdarg.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <limits.h>
  32 #include <time.h>
  33 #ifdef HAVE_SYS_TIME_H
  34 # include <sys/time.h>
  35 #endif
  36 #ifdef HAVE_UNISTD_H
  37 # include <unistd.h>
  38 #endif
  39
  40 #define NONAMELESSUNION
  41 #define NONAMELESSSTRUCT
  42 #include "windef.h"
  43 #include "winbase.h"
  44 #include "winreg.h"
  45 #include "winternl.h"
  46 #include "wine/unicode.h"
  47 #include "wine/debug.h"
  48 #include "ntdll_misc.h"
  49
  50 WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
  51
  52 static CRITICAL_SECTION TIME_GetBias_section;
  53 static CRITICAL_SECTION_DEBUG critsect_debug =
  54 {
  55     0, 0, &TIME_GetBias_section,
  56     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  57       0, 0, { 0, (DWORD)(__FILE__ ": TIME_GetBias_section") }
  58 };
  59 static CRITICAL_SECTION TIME_GetBias_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  60
  61 /* TimeZone registry key values */
  62 static const WCHAR TZInformationKeyW[] = { 'M','a','c','h','i','n','e','\\',
  63  'S','Y','S','T','E','M','\\','C','u','r','r','e','n','t','C','o','n','t','r',
  64  'o','l','S','e','t','\\','C','o','n','t','r','o','l','\\','T','i','m','e','z',
  65  'o','n','e','I','n','f','o','r','m','a','t','i','o','n', 0};
  66 static const WCHAR TZStandardStartW[] = {
  67   'S','t','a','n','d','a','r','d','s','t','a','r','t', 0};
  68 static const WCHAR TZDaylightStartW[] = {
  69   'D','a','y','l','i','g','h','t','s','t','a','r','t', 0};
  70 static const WCHAR TZDaylightBiasW[] = {
  71     'D','a','y','l','i','g','h','t','B','i','a','s', 0};
  72 static const WCHAR TZStandardBiasW[] = {
  73     'S','t','a','n','d','a','r','d','B','i','a','s', 0};
  74 static const WCHAR TZBiasW[] = {'B','i','a','s', 0};
  75 static const WCHAR TZDaylightNameW[] = {
  76     'D','a','y','l','i','g','h','t','N','a','m','e', 0};
  77 static const WCHAR TZStandardNameW[] = {
  78     'S','t','a','n','d','a','r','d','N','a','m','e', 0};
  79
  80
  81 #define SETTIME_MAX_ADJUST 120
  82
  83 /* This structure is used to store strings that represent all of the time zones
  84  * in the world. (This is used to help GetTimeZoneInformation)
  85  */
  86 struct tagTZ_INFO
  87 {
  88     const char *psTZFromUnix;
  89     WCHAR psTZWindows[32];
  90     int bias;
  91     int dst;
  92 };
  93
  94 static const struct tagTZ_INFO TZ_INFO[] =
  95 {
  96    {"MHT",
  97     {'D','a','t','e','l','i','n','e',' ','S','t','a','n','d','a','r','d',' ',
  98      'T','i','m','e','\0'}, -720, 0},
  99    {"SST",
 100     {'S','a','m','o','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 101      'e','\0'}, 660, 0},
 102    {"HST",
 103     {'H','a','w','a','i','i','a','n',' ','S','t','a','n','d','a','r','d',' ',
 104      'T','i','m','e','\0'}, 600, 0},
 105    {"AKDT",
 106     {'A','l','a','s','k','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 107      'i','m','e','\0'}, 480, 1},
 108    {"PST",
 109     {'P','a','c','i','f','i','c',' ','S','t','a','n','d','a','r','d',' ','T',
 110      'i','m','e','\0'}, 480, 0},
 111    {"PDT",
 112     {'P','a','c','i','f','i','c',' ','S','t','a','n','d','a','r','d',' ','T',
 113      'i','m','e','\0'}, 420, 1},
 114    {"MST",
 115     {'U','S',' ','M','o','u','n','t','a','i','n',' ','S','t','a','n','d','a',
 116      'r','d',' ','T','i','m','e','\0'}, 420, 0},
 117    {"MDT",
 118     {'M','o','u','n','t','a','i','n',' ','S','t','a','n','d','a','r','d',' ',
 119      'T','i','m','e','\0'}, 360, 1},
 120    {"CST",
 121     {'C','e','n','t','r','a','l',' ','A','m','e','r','i','c','a',' ','S','t',
 122      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, 360, 0},
 123    {"CDT",
 124     {'C','e','n','t','r','a','l',' ','S','t','a','n','d','a','r','d',' ','T',
 125      'i','m','e','\0'}, 300, 1},
 126    {"COT",
 127     {'S','A',' ','P','a','c','i','f','i','c',' ','S','t','a','n','d','a','r',
 128      'd',' ','T','i','m','e','\0'}, 300, 0},
 129    {"EDT",
 130     {'E','a','s','t','e','r','n',' ','S','t','a','n','d','a','r','d',' ','T',
 131      'i','m','e','\0'}, 240, 1},
 132    {"EST",
 133     {'U','S',' ','E','a','s','t','e','r','n',' ','S','t','a','n','d','a','r',
 134      'd',' ','T','i','m','e','\0'}, 300, 0},
 135    {"ECT",
 136     {'E','a','s','t','e','r','n',' ','C','e','n','t','r','a','l',' ','S','t','a','n','d','a','r',
 137      'd',' ','T','i','m','e','\0'}, 300, 0},
 138    {"ADT",
 139     {'A','t','l','a','n','t','i','c',' ','S','t','a','n','d','a','r','d',' ',
 140      'T','i','m','e','\0'}, 180, 1},
 141    {"VET",
 142     {'S','A',' ','W','e','s','t','e','r','n',' ','S','t','a','n','d','a','r',
 143      'd',' ','T','i','m','e','\0'}, 240, 0},
 144    {"CLT",
 145     {'P','a','c','i','f','i','c',' ','S','A',' ','S','t','a','n','d','a','r',
 146      'd',' ','T','i','m','e','\0'}, 240, 0},
 147    {"NDT",
 148     {'N','e','w','f','o','u','n','d','l','a','n','d',' ','S','t','a','n','d',
 149      'a','r','d',' ','T','i','m','e','\0'}, 150, 1},
 150    {"BRT",
 151     {'B','r','a','z','i','l','i','a','n',' ','S','t','a','n','d','a','r','d',
 152      ' ','T','i','m','e','\0'}, 180, 0},
 153    {"BRST",
 154     {'B','r','a','z','i','l','i','a','n',' ','S','u','m','m','e','r',
 155      ' ','T','i','m','e','\0'}, 120, 1},
 156    {"ART",
 157     {'S','A',' ','E','a','s','t','e','r','n',' ','S','t','a','n','d','a','r',
 158      'd',' ','T','i','m','e','\0'}, 180, 0},
 159    {"WGST",
 160     {'G','r','e','e','n','l','a','n','d',' ','S','t','a','n','d','a','r','d',
 161      ' ','T','i','m','e','\0'}, 120, 1},
 162    {"GST",
 163     {'M','i','d','-','A','t','l','a','n','t','i','c',' ','S','t','a','n','d',
 164      'a','r','d',' ','T','i','m','e','\0'}, 120, 0},
 165    {"AZOST",
 166     {'A','z','o','r','e','s',' ','S','t','a','n','d','a','r','d',' ','T','i',
 167      'm','e','\0'}, 0, 1},
 168    {"CVT",
 169     {'C','a','p','e',' ','V','e','r','d','e',' ','S','t','a','n','d','a','r',
 170      'd',' ','T','i','m','e','\0'}, 60, 0},
 171    {"WET",
 172     {'G','r','e','e','n','w','i','c','h',' ','S','t','a','n','d','a','r','d',
 173      ' ','T','i','m','e','\0'}, 0, 0},
 174    {"BST",
 175     {'G','M','T',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'},
 176     -60, 1},
 177    {"GMT",
 178     {'G','M','T',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'},
 179     0, 0},
 180    {"UTC",
 181     {'G','M','T',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'},
 182     0, 0},
 183    {"CET",
 184     {'C','e','n','t','r','a','l',' ','E','u','r','o','p','e','a','n',' ',
 185      'T','i','m','e','\0'}, -60, 0},
 186    {"CEST",
 187     {'C','e','n','t','r','a','l',' ','E','u','r','o','p','e',' ','S','t','a',
 188      'n','d','a','r','d',' ','T','i','m','e','\0'}, -120, 1},
 189    {"MET",
 190     {'C','e','n','t','r','a','l',' ','E','u','r','o','p','e',' ','S','t','a',
 191      'n','d','a','r','d',' ','T','i','m','e','\0'}, -60, 0},
 192    {"MEST",
 193     {'C','e','n','t','r','a','l',' ','E','u','r','o','p','e',' ','D','a','y',
 194      'l','i','g','h','t',' ','T','i','m','e','\0'}, -120, 1},
 195    {"WAT",
 196     {'W','.',' ','C','e','n','t','r','a','l',' ','A','f','r','i','c','a',' ',
 197      'S','t','a','n','d','a','r','d',' ','T','i','m','e','\0'}, -60, 0},
 198    {"EEST",
 199     {'E','.',' ','E','u','r','o','p','e',' ','S','t','a','n','d','a','r','d',
 200      ' ','T','i','m','e','\0'}, -180, 1},
 201    {"EET",
 202     {'E','g','y','p','t',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 203      'e','\0'}, -120, 0},
 204    {"CAT",
 205     {'C','e','n','t','r','a','l',' ','A','f','r','i','c','a','n',' '
 206     ,'T','i','m','e','\0'}, -120, 0},
 207    {"SAST",
 208     {'S','o','u','t','h',' ','A','f','r','i','c','a',' ','S','t','a','n','d',
 209      'a','r','d',' ','T','i','m','e','\0'}, -120, 0},
 210    {"IST",
 211     {'I','s','r','a','e','l',' ','S','t','a','n','d','a','r','d',' ','T','i',
 212      'm','e','\0'}, -120, 0},
 213    {"MSK",
 214     {'R','u','s','s','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 215      'i','m','e','\0'}, -180, 0},
 216    {"ADT",
 217     {'A','r','a','b','i','c',' ','S','t','a','n','d','a','r','d',' ','T','i',
 218      'm','e','\0'}, -240, 1},
 219    {"AST",
 220     {'A','r','a','b',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 221      '\0'}, -180, 0},
 222    {"MSD",
 223     {'R','u','s','s','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 224      'i','m','e','\0'}, -240, 1},
 225    {"EAT",
 226     {'E','.',' ','A','f','r','i','c','a',' ','S','t','a','n','d','a','r','d',
 227      ' ','T','i','m','e','\0'}, -180, 0},
 228    {"IRST",
 229     {'I','r','a','n',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 230      '\0'}, -270, 1},
 231    {"GST",
 232     {'A','r','a','b','i','a','n',' ','S','t','a','n','d','a','r','d',' ','T',
 233      'i','m','e','\0'}, -240, 0},
 234    {"AZST",
 235     {'C','a','u','c','a','s','u','s',' ','S','t','a','n','d','a','r','d',' ',
 236      'T','i','m','e','\0'}, -300, 1},
 237    {"AFT",
 238     {'A','f','g','h','a','n','i','s','t','a','n',' ','S','t','a','n','d','a',
 239      'r','d',' ','T','i','m','e','\0'}, -270, 0},
 240    {"SAMT",
 241     {'S','a','m','a','r','a',' ','S','t','a','n','d','a','r','d',' ','T','i',
 242      'm','e','\0'}, -270, 1},
 243    {"YEKST",
 244     {'E','k','a','t','e','r','i','n','b','u','r','g',' ','S','t','a','n','d',
 245      'a','r','d',' ','T','i','m','e','\0'}, -360, 1},
 246    {"PKT",
 247     {'W','e','s','t',' ','A','s','i','a',' ','S','t','a','n','d','a','r','d',
 248      ' ','T','i','m','e','\0'}, -300, 0},
 249    {"IST",
 250     {'I','n','d','i','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 251      'e','\0'}, -330, 0},
 252    {"NPT",
 253     {'N','e','p','a','l',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 254      'e','\0'}, -345, 0},
 255    {"ALMST",
 256     {'N','.',' ','C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t',
 257      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -420, 1},
 258    {"BDT",
 259     {'C','e','n','t','r','a','l',' ','A','s','i','a',' ','S','t','a','n','d',
 260      'a','r','d',' ','T','i','m','e','\0'}, -360, 0},
 261    {"LKT",
 262     {'S','r','i',' ','L','a','n','k','a',' ','S','t','a','n','d','a','r','d',
 263      ' ','T','i','m','e','\0'}, -360, 0},
 264    {"MMT",
 265     {'M','y','a','n','m','a','r',' ','S','t','a','n','d','a','r','d',' ','T',
 266      'i','m','e','\0'}, -390, 0},
 267    {"ICT",
 268     {'S','E',' ','A','s','i','a',' ','S','t','a','n','d','a','r','d',' ','T',
 269      'i','m','e','\0'}, -420, 0},
 270    {"KRAST",
 271     {'N','o','r','t','h',' ','A','s','i','a',' ','S','t','a','n','d','a','r',
 272      'd',' ','T','i','m','e','\0'}, -480, 1},
 273    {"CST",
 274     {'C','h','i','n','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 275      'e','\0'}, -480, 0},
 276    {"IRKST",
 277     {'N','o','r','t','h',' ','A','s','i','a',' ','E','a','s','t',' ','S','t',
 278      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -540, 1},
 279    {"SGT",
 280     {'M','a','l','a','y',' ','P','e','n','i','n','s','u','l','a',' ','S','t',
 281      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -480, 0},
 282    {"WST",
 283     {'W','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 284      'a','r','d',' ','T','i','m','e','\0'}, -480, 0},
 285    {"JST",
 286     {'T','o','k','y','o',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 287      'e','\0'}, -540, 0},
 288    {"KST",
 289     {'K','o','r','e','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 290      'e','\0'}, -540, 0},
 291    {"YAKST",
 292     {'Y','a','k','u','t','s','k',' ','S','t','a','n','d','a','r','d',' ','T',
 293      'i','m','e','\0'}, -600, 1},
 294    {"CST",
 295     {'C','e','n','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a',
 296      'n','d','a','r','d',' ','T','i','m','e','\0'}, -570, 0},
 297    {"EST",
 298     {'E','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 299      'a','r','d',' ','T','i','m','e','\0'}, -600, 0},
 300    {"EST",
 301     {'E','.',' ','A','u','s','t','r','a','l','i','a',' ','S','t','a','n','d',
 302      'a','r','d',' ','T','i','m','e','\0'}, -660, 1},
 303    {"GST",
 304     {'W','e','s','t',' ','P','a','c','i','f','i','c',' ','S','t','a','n','d',
 305      'a','r','d',' ','T','i','m','e','\0'}, -600, 0},
 306    {"VLAST",
 307     {'V','l','a','d','i','v','o','s','t','o','k',' ','S','t','a','n','d','a',
 308      'r','d',' ','T','i','m','e','\0'}, -660, 1},
 309    {"MAGST",
 310     {'C','e','n','t','r','a','l',' ','P','a','c','i','f','i','c',' ','S','t',
 311      'a','n','d','a','r','d',' ','T','i','m','e','\0'}, -720, 1},
 312    {"NZST",
 313     {'N','e','w',' ','Z','e','a','l','a','n','d',' ','S','t','a','n','d','a',
 314      'r','d',' ','T','i','m','e','\0'}, -720, 0},
 315    {"NZDT",
 316     {'N','e','w',' ','Z','e','a','l','a','n','d',' ','D','a','y','l','i','g',
 317      'h','t',' ','T','i','m','e','\0'}, -780, 1},
 318    {"FJT",
 319     {'F','i','j','i',' ','S','t','a','n','d','a','r','d',' ','T','i','m','e',
 320      '\0'}, -720, 0},
 321    {"TOT",
 322     {'T','o','n','g','a',' ','S','t','a','n','d','a','r','d',' ','T','i','m',
 323      'e','\0'}, -780, 0},
 324    {"NOVT",
 325     {'N','o','v','o','s','i','b','i','r','s','k',' ','S','t','a','n','d','a',
 326      'r','d',' ','T','i','m','e','\0'}, -360, 1},
 327    {"ANAT",
 328     {'A','n','a','d','y','r',' ','S','t','a','n','d','a','r','d',' ','T','i',
 329      'm','e','\0'}, -720, 1}
 330 };
 331
 332 #define TICKSPERSEC        10000000
 333 #define TICKSPERMSEC       10000
 334 #define SECSPERDAY         86400
 335 #define SECSPERHOUR        3600
 336 #define SECSPERMIN         60
 337 #define MINSPERHOUR        60
 338 #define HOURSPERDAY        24
 339 #define EPOCHWEEKDAY       1  /* Jan 1, 1601 was Monday */
 340 #define DAYSPERWEEK        7
 341 #define EPOCHYEAR          1601
 342 #define DAYSPERNORMALYEAR  365
 343 #define DAYSPERLEAPYEAR    366
 344 #define MONSPERYEAR        12
 345 #define DAYSPERQUADRICENTENNIUM (365 * 400 + 97)
 346 #define DAYSPERNORMALCENTURY (365 * 100 + 24)
 347 #define DAYSPERNORMALQUADRENNIUM (365 * 4 + 1)
 348
 349 /* 1601 to 1970 is 369 years plus 89 leap days */
 350 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
 351 #define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
 352 /* 1601 to 1980 is 379 years plus 91 leap days */
 353 #define SECS_1601_TO_1980  ((379 * 365 + 91) * (ULONGLONG)SECSPERDAY)
 354 #define TICKS_1601_TO_1980 (SECS_1601_TO_1980 * TICKSPERSEC)
 355 /* max ticks that can be represented as Unix time */
 356 #define TICKS_1601_TO_UNIX_MAX ((SECS_1601_TO_1970 + INT_MAX) * TICKSPERSEC)
 357
 358
 359 static const int MonthLengths[2][MONSPERYEAR] =
 360 {
 361         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
 362         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
 363 };
 364
 365 static inline int IsLeapYear(int Year)
 366 {
 367         return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ? 1 : 0;
 368 }
 369
 370 /***********************************************************************
 371  *              NTDLL_get_server_timeout
 372  *
 373  * Convert a NTDLL timeout into a timeval struct to send to the server.
 374  */
 375 void NTDLL_get_server_timeout( abs_time_t *when, const LARGE_INTEGER *timeout )
 376 {
 377     UINT remainder;
 378
 379     if (!timeout)  /* infinite timeout */
 380     {
 381         when->sec = when->usec = 0;
 382     }
 383     else if (timeout->QuadPart <= 0)  /* relative timeout */
 384     {
 385         struct timeval tv;
 386
 387         if (-timeout->QuadPart > (LONGLONG)INT_MAX * TICKSPERSEC)
 388             when->sec = when->usec = INT_MAX;
 389         else
 390         {
 391             ULONG sec = RtlEnlargedUnsignedDivide( -timeout->QuadPart, TICKSPERSEC, &remainder );
 392             gettimeofday( &tv, 0 );
 393             when->sec = tv.tv_sec + sec;
 394             if ((when->usec = tv.tv_usec + (remainder / 10)) >= 1000000)
 395             {
 396                 when->usec -= 1000000;
 397                 when->sec++;
 398             }
 399             if (when->sec < tv.tv_sec)  /* overflow */
 400                 when->sec = when->usec = INT_MAX;
 401         }
 402     }
 403     else  /* absolute time */
 404     {
 405         if (timeout->QuadPart < TICKS_1601_TO_1970)
 406             when->sec = when->usec = 0;
 407         else if (timeout->QuadPart > TICKS_1601_TO_UNIX_MAX)
 408             when->sec = when->usec = INT_MAX;
 409         else
 410         {
 411             when->sec = RtlEnlargedUnsignedDivide( timeout->QuadPart - TICKS_1601_TO_1970,
 412                                                    TICKSPERSEC, &remainder );
 413             when->usec = remainder / 10;
 414         }
 415     }
 416 }
 417
 418
 419 /***********************************************************************
 420  *              NTDLL_from_server_timeout
 421  *
 422  * Convert a timeval struct from the server into an NTDLL timeout.
 423  */
 424 void NTDLL_from_server_timeout( LARGE_INTEGER *timeout, const abs_time_t *when )
 425 {
 426     timeout->QuadPart = when->sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 427     timeout->QuadPart += when->usec * 10;
 428 }
 429
 430
 431 /******************************************************************************
 432  *       RtlTimeToTimeFields [NTDLL.@]
 433  *
 434  * Convert a time into a TIME_FIELDS structure.
 435  *
 436  * PARAMS
 437  *   liTime     [I] Time to convert.
 438  *   TimeFields [O] Destination for the converted time.
 439  *
 440  * RETURNS
 441  *   Nothing.
 442  */
 443 VOID WINAPI RtlTimeToTimeFields(
 444         const LARGE_INTEGER *liTime,
 445         PTIME_FIELDS TimeFields)
 446 {
 447         int SecondsInDay;
 448         long int cleaps, years, yearday, months;
 449         long int Days;
 450         LONGLONG Time;
 451
 452         /* Extract millisecond from time and convert time into seconds */
 453         TimeFields->Milliseconds =
 454             (CSHORT) (( liTime->QuadPart % TICKSPERSEC) / TICKSPERMSEC);
 455         Time = liTime->QuadPart / TICKSPERSEC;
 456
 457         /* The native version of RtlTimeToTimeFields does not take leap seconds
 458          * into account */
 459
 460         /* Split the time into days and seconds within the day */
 461         Days = Time / SECSPERDAY;
 462         SecondsInDay = Time % SECSPERDAY;
 463
 464         /* compute time of day */
 465         TimeFields->Hour = (CSHORT) (SecondsInDay / SECSPERHOUR);
 466         SecondsInDay = SecondsInDay % SECSPERHOUR;
 467         TimeFields->Minute = (CSHORT) (SecondsInDay / SECSPERMIN);
 468         TimeFields->Second = (CSHORT) (SecondsInDay % SECSPERMIN);
 469
 470         /* compute day of week */
 471         TimeFields->Weekday = (CSHORT) ((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
 472
 473         /* compute year, month and day of month. */
 474         cleaps=( 3 * ((4 * Days + 1227) / DAYSPERQUADRICENTENNIUM) + 3 ) / 4;
 475         Days += 28188 + cleaps;
 476         years = (20 * Days - 2442) / (5 * DAYSPERNORMALQUADRENNIUM);
 477         yearday = Days - (years * DAYSPERNORMALQUADRENNIUM)/4;
 478         months = (64 * yearday) / 1959;
 479         /* the result is based on a year starting on March.
 480          * To convert take 12 from Januari and Februari and
 481          * increase the year by one. */
 482         if( months < 14 ) {
 483             TimeFields->Month = months - 1;
 484             TimeFields->Year = years + 1524;
 485         } else {
 486             TimeFields->Month = months - 13;
 487             TimeFields->Year = years + 1525;
 488         }
 489         /* calculation of day of month is based on the wonderful
 490          * sequence of INT( n * 30.6): it reproduces the
 491          * 31-30-31-30-31-31 month lengths exactly for small n's */
 492         TimeFields->Day = yearday - (1959 * months) / 64 ;
 493         return;
 494 }
 495
 496 /******************************************************************************
 497  *       RtlTimeFieldsToTime [NTDLL.@]
 498  *
 499  * Convert a TIME_FIELDS structure into a time.
 500  *
 501  * PARAMS
 502  *   ftTimeFields [I] TIME_FIELDS structure to convert.
 503  *   Time         [O] Destination for the converted time.
 504  *
 505  * RETURNS
 506  *   Success: TRUE.
 507  *   Failure: FALSE.
 508  */
 509 BOOLEAN WINAPI RtlTimeFieldsToTime(
 510         PTIME_FIELDS tfTimeFields,
 511         PLARGE_INTEGER Time)
 512 {
 513         int month, year, cleaps, day;
 514
 515         /* FIXME: normalize the TIME_FIELDS structure here */
 516         /* No, native just returns 0 (error) if the fields are not */
 517         if( tfTimeFields->Milliseconds< 0 || tfTimeFields->Milliseconds > 999 ||
 518                 tfTimeFields->Second < 0 || tfTimeFields->Second > 59 ||
 519                 tfTimeFields->Minute < 0 || tfTimeFields->Minute > 59 ||
 520                 tfTimeFields->Hour < 0 || tfTimeFields->Hour > 23 ||
 521                 tfTimeFields->Month < 1 || tfTimeFields->Month > 12 ||
 522                 tfTimeFields->Day < 1 ||
 523                 tfTimeFields->Day > MonthLengths
 524                     [ tfTimeFields->Month ==2 || IsLeapYear(tfTimeFields->Year)]
 525                     [ tfTimeFields->Month - 1] ||
 526                 tfTimeFields->Year < 1601 )
 527             return FALSE;
 528
 529         /* now calculate a day count from the date
 530          * First start counting years from March. This way the leap days
 531          * are added at the end of the year, not somewhere in the middle.
 532          * Formula's become so much less complicate that way.
 533          * To convert: add 12 to the month numbers of Jan and Feb, and
 534          * take 1 from the year */
 535         if(tfTimeFields->Month < 3) {
 536             month = tfTimeFields->Month + 13;
 537             year = tfTimeFields->Year - 1;
 538         } else {
 539             month = tfTimeFields->Month + 1;
 540             year = tfTimeFields->Year;
 541         }
 542         cleaps = (3 * (year / 100) + 3) / 4;   /* nr of "century leap years"*/
 543         day =  (36525 * year) / 100 - cleaps + /* year * dayperyr, corrected */
 544                  (1959 * month) / 64 +         /* months * daypermonth */
 545                  tfTimeFields->Day -          /* day of the month */
 546                  584817 ;                      /* zero that on 1601-01-01 */
 547         /* done */
 548
 549         Time->QuadPart = (((((LONGLONG) day * HOURSPERDAY +
 550             tfTimeFields->Hour) * MINSPERHOUR +
 551             tfTimeFields->Minute) * SECSPERMIN +
 552             tfTimeFields->Second ) * 1000 +
 553             tfTimeFields->Milliseconds ) * TICKSPERMSEC;
 554
 555         return TRUE;
 556 }
 557
 558 /***********************************************************************
 559  *       TIME_GetBias [internal]
 560  *
 561  * Helper function calculates delta local time from UTC.
 562  *
 563  * PARAMS
 564  *   utc [I] The current utc time.
 565  *   pdaylight [I] Local daylight.
 566  *
 567  * RETURNS
 568  *   The bias for the current timezone.
 569  */
 570 static int TIME_GetBias(time_t utc, int *pdaylight)
 571 {
 572     struct tm *ptm;
 573     static time_t last_utc;
 574     static int last_bias;
 575     static int last_daylight;
 576     int ret;
 577
 578     RtlEnterCriticalSection( &TIME_GetBias_section );
 579     if(utc == last_utc)
 580     {
 581         *pdaylight = last_daylight;
 582         ret = last_bias;
 583     } else
 584     {
 585         ptm = localtime(&utc);
 586         *pdaylight = last_daylight =
 587             ptm->tm_isdst; /* daylight for local timezone */
 588         ptm = gmtime(&utc);
 589         ptm->tm_isdst = *pdaylight; /* use local daylight, not that of Greenwich */
 590         last_utc = utc;
 591         ret = last_bias = (int)(utc-mktime(ptm));
 592     }
 593     RtlLeaveCriticalSection( &TIME_GetBias_section );
 594     return ret;
 595 }
 596
 597 /******************************************************************************
 598  *        RtlLocalTimeToSystemTime [NTDLL.@]
 599  *
 600  * Convert a local time into system time.
 601  *
 602  * PARAMS
 603  *   LocalTime  [I] Local time to convert.
 604  *   SystemTime [O] Destination for the converted time.
 605  *
 606  * RETURNS
 607  *   Success: STATUS_SUCCESS.
 608  *   Failure: An NTSTATUS error code indicating the problem.
 609  */
 610 NTSTATUS WINAPI RtlLocalTimeToSystemTime( const LARGE_INTEGER *LocalTime,
 611                                           PLARGE_INTEGER SystemTime)
 612 {
 613     time_t gmt;
 614     int bias, daylight;
 615
 616     TRACE("(%p, %p)\n", LocalTime, SystemTime);
 617
 618     gmt = time(NULL);
 619     bias = TIME_GetBias(gmt, &daylight);
 620
 621     SystemTime->QuadPart = LocalTime->QuadPart - bias * (LONGLONG)TICKSPERSEC;
 622     return STATUS_SUCCESS;
 623 }
 624
 625 /******************************************************************************
 626  *       RtlSystemTimeToLocalTime [NTDLL.@]
 627  *
 628  * Convert a system time into a local time.
 629  *
 630  * PARAMS
 631  *   SystemTime [I] System time to convert.
 632  *   LocalTime  [O] Destination for the converted time.
 633  *
 634  * RETURNS
 635  *   Success: STATUS_SUCCESS.
 636  *   Failure: An NTSTATUS error code indicating the problem.
 637  */
 638 NTSTATUS WINAPI RtlSystemTimeToLocalTime( const LARGE_INTEGER *SystemTime,
 639                                           PLARGE_INTEGER LocalTime )
 640 {
 641     time_t gmt;
 642     int bias, daylight;
 643
 644     TRACE("(%p, %p)\n", SystemTime, LocalTime);
 645
 646     gmt = time(NULL);
 647     bias = TIME_GetBias(gmt, &daylight);
 648
 649     LocalTime->QuadPart = SystemTime->QuadPart + bias * (LONGLONG)TICKSPERSEC;
 650     return STATUS_SUCCESS;
 651 }
 652
 653 /******************************************************************************
 654  *       RtlTimeToSecondsSince1970 [NTDLL.@]
 655  *
 656  * Convert a time into a count of seconds since 1970.
 657  *
 658  * PARAMS
 659  *   Time    [I] Time to convert.
 660  *   Seconds [O] Destination for the converted time.
 661  *
 662  * RETURNS
 663  *   Success: TRUE.
 664  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 665  */
 666 BOOLEAN WINAPI RtlTimeToSecondsSince1970( const LARGE_INTEGER *Time, LPDWORD Seconds )
 667 {
 668     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 669     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 670     tmp -= SECS_1601_TO_1970;
 671     if (tmp > 0xffffffff) return FALSE;
 672     *Seconds = (DWORD)tmp;
 673     return TRUE;
 674 }
 675
 676 /******************************************************************************
 677  *       RtlTimeToSecondsSince1980 [NTDLL.@]
 678  *
 679  * Convert a time into a count of seconds since 1980.
 680  *
 681  * PARAMS
 682  *   Time    [I] Time to convert.
 683  *   Seconds [O] Destination for the converted time.
 684  *
 685  * RETURNS
 686  *   Success: TRUE.
 687  *   Failure: FALSE, if the resulting value will not fit in a DWORD.
 688  */
 689 BOOLEAN WINAPI RtlTimeToSecondsSince1980( const LARGE_INTEGER *Time, LPDWORD Seconds )
 690 {
 691     ULONGLONG tmp = ((ULONGLONG)Time->u.HighPart << 32) | Time->u.LowPart;
 692     tmp = RtlLargeIntegerDivide( tmp, TICKSPERSEC, NULL );
 693     tmp -= SECS_1601_TO_1980;
 694     if (tmp > 0xffffffff) return FALSE;
 695     *Seconds = (DWORD)tmp;
 696     return TRUE;
 697 }
 698
 699 /******************************************************************************
 700  *       RtlSecondsSince1970ToTime [NTDLL.@]
 701  *
 702  * Convert a count of seconds since 1970 to a time.
 703  *
 704  * PARAMS
 705  *   Seconds [I] Time to convert.
 706  *   Time    [O] Destination for the converted time.
 707  *
 708  * RETURNS
 709  *   Nothing.
 710  */
 711 void WINAPI RtlSecondsSince1970ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 712 {
 713     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 714     Time->u.LowPart  = (DWORD)secs;
 715     Time->u.HighPart = (DWORD)(secs >> 32);
 716 }
 717
 718 /******************************************************************************
 719  *       RtlSecondsSince1980ToTime [NTDLL.@]
 720  *
 721  * Convert a count of seconds since 1980 to a time.
 722  *
 723  * PARAMS
 724  *   Seconds [I] Time to convert.
 725  *   Time    [O] Destination for the converted time.
 726  *
 727  * RETURNS
 728  *   Nothing.
 729  */
 730 void WINAPI RtlSecondsSince1980ToTime( DWORD Seconds, LARGE_INTEGER *Time )
 731 {
 732     ULONGLONG secs = Seconds * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1980;
 733     Time->u.LowPart  = (DWORD)secs;
 734     Time->u.HighPart = (DWORD)(secs >> 32);
 735 }
 736
 737 /******************************************************************************
 738  *       RtlTimeToElapsedTimeFields [NTDLL.@]
 739  *
 740  * Convert a time to a count of elapsed seconds.
 741  *
 742  * PARAMS
 743  *   Time       [I] Time to convert.
 744  *   TimeFields [O] Destination for the converted time.
 745  *
 746  * RETURNS
 747  *   Nothing.
 748  */
 749 void WINAPI RtlTimeToElapsedTimeFields( const LARGE_INTEGER *Time, PTIME_FIELDS TimeFields )
 750 {
 751     LONGLONG time;
 752     UINT rem;
 753
 754     time = RtlExtendedLargeIntegerDivide( Time->QuadPart, TICKSPERSEC, &rem );
 755     TimeFields->Milliseconds = rem / TICKSPERMSEC;
 756
 757     /* time is now in seconds */
 758     TimeFields->Year  = 0;
 759     TimeFields->Month = 0;
 760     TimeFields->Day   = RtlExtendedLargeIntegerDivide( time, SECSPERDAY, &rem );
 761
 762     /* rem is now the remaining seconds in the last day */
 763     TimeFields->Second = rem % 60;
 764     rem /= 60;
 765     TimeFields->Minute = rem % 60;
 766     TimeFields->Hour = rem / 60;
 767 }
 768
 769 /***********************************************************************
 770  *       NtQuerySystemTime [NTDLL.@]
 771  *       ZwQuerySystemTime [NTDLL.@]
 772  *
 773  * Get the current system time.
 774  *
 775  * PARAMS
 776  *   Time [O] Destination for the current system time.
 777  *
 778  * RETURNS
 779  *   Success: STATUS_SUCCESS.
 780  *   Failure: An NTSTATUS error code indicating the problem.
 781  */
 782 NTSTATUS WINAPI NtQuerySystemTime( PLARGE_INTEGER Time )
 783 {
 784     struct timeval now;
 785
 786     gettimeofday( &now, 0 );
 787     Time->QuadPart = now.tv_sec * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 788     Time->QuadPart += now.tv_usec * 10;
 789     return STATUS_SUCCESS;
 790 }
 791
 792 /***********************************************************************
 793  *        TIME_GetTZAsStr [internal]
 794  *
 795  * Helper function that returns the given timezone as a string.
 796  *
 797  * PARAMS
 798  *   utc [I] The current utc time.
 799  *   bias [I] The bias of the current timezone.
 800  *   dst [I] ??
 801  *
 802  * RETURNS
 803  *   Timezone name.
 804  *
 805  * NOTES:
 806  *   This could be done with a hash table instead of merely iterating through a
 807  *   table, however with the small amount of entries (60 or so) I didn't think
 808  *   it was worth it.
 809  */
 810 static const WCHAR* TIME_GetTZAsStr (time_t utc, int bias, int dst)
 811 {
 812    char psTZName[7];
 813    struct tm *ptm = localtime(&utc);
 814    unsigned int i;
 815
 816    if (!strftime (psTZName, 7, "%Z", ptm))
 817       return (NULL);
 818
 819    for (i=0; i<(sizeof(TZ_INFO) / sizeof(struct tagTZ_INFO)); i++)
 820    {
 821       if ( strcmp(TZ_INFO[i].psTZFromUnix, psTZName) == 0 &&
 822            TZ_INFO[i].bias == bias &&
 823            TZ_INFO[i].dst == dst
 824          )
 825             return TZ_INFO[i].psTZWindows;
 826    }
 827    FIXME("Can't match system time zone name \"%s\", bias=%d and dst=%d "
 828          "to an entry in TZ_INFO. Please add appropriate entry to "
 829          "TZ_INFO and submit as patch to wine-patches\n",psTZName,bias,dst);
 830    return NULL;
 831 }
 832
 833 /***  TIME_GetTimeZoneInfoFromReg: helper for GetTimeZoneInformation ***/
 834
 835
 836 static int TIME_GetTimeZoneInfoFromReg(LPTIME_ZONE_INFORMATION tzinfo)
 837 {
 838     BYTE buf[90];
 839     KEY_VALUE_PARTIAL_INFORMATION * KpInfo =
 840         (KEY_VALUE_PARTIAL_INFORMATION *) buf;
 841     HKEY hkey;
 842     DWORD size;
 843     OBJECT_ATTRIBUTES attr;
 844     UNICODE_STRING nameW;
 845
 846     attr.Length = sizeof(attr);
 847     attr.RootDirectory = 0;
 848     attr.ObjectName = &nameW;
 849     attr.Attributes = 0;
 850     attr.SecurityDescriptor = NULL;
 851     attr.SecurityQualityOfService = NULL;
 852     RtlInitUnicodeString( &nameW, TZInformationKeyW);
 853     if (!NtOpenKey( &hkey, KEY_ALL_ACCESS, &attr )) {
 854
 855 #define GTZIFR_N( valkey, tofield) \
 856         RtlInitUnicodeString( &nameW, valkey );\
 857         if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, KpInfo,\
 858                     sizeof(buf), &size )) { \
 859             if( size >= (sizeof((tofield)) + \
 860                     offsetof(KEY_VALUE_PARTIAL_INFORMATION,Data))); { \
 861                 memcpy(&(tofield), \
 862                         KpInfo->Data, sizeof(tofield)); \
 863             } \
 864         }
 865 #define GTZIFR_S( valkey, tofield) \
 866         RtlInitUnicodeString( &nameW, valkey );\
 867         if (!NtQueryValueKey( hkey, &nameW, KeyValuePartialInformation, KpInfo,\
 868                     sizeof(buf), &size )) { \
 869             size_t len = (strlenW( (WCHAR*)KpInfo->Data ) + 1) * sizeof(WCHAR); \
 870             if (len > sizeof(tofield)) len = sizeof(tofield); \
 871             memcpy( tofield, KpInfo->Data, len ); \
 872             tofield[(len/sizeof(WCHAR))-1] = 0; \
 873         }
 874
 875         GTZIFR_N( TZStandardStartW,  tzinfo->StandardDate)
 876         GTZIFR_N( TZDaylightStartW,  tzinfo->DaylightDate)
 877         GTZIFR_N( TZBiasW,          tzinfo->Bias)
 878         GTZIFR_N( TZStandardBiasW,  tzinfo->StandardBias)
 879         GTZIFR_N( TZDaylightBiasW,  tzinfo->DaylightBias)
 880         GTZIFR_S( TZStandardNameW, tzinfo->StandardName)
 881         GTZIFR_S( TZDaylightNameW, tzinfo->DaylightName)
 882
 883 #undef GTZIFR_N
 884 #undef GTZIFR_S
 885         NtClose( hkey );
 886         return 1;
 887     }
 888     return 0;
 889 }
 890
 891 /***********************************************************************
 892  *      RtlQueryTimeZoneInformation [NTDLL.@]
 893  *
 894  * Get information about the current timezone.
 895  *
 896  * PARAMS
 897  *   tzinfo [O] Destination for the retrieved timezone info.
 898  *
 899  * RETURNS
 900  *   Success: STATUS_SUCCESS.
 901  *   Failure: An NTSTATUS error code indicating the problem.
 902  */
 903 NTSTATUS WINAPI RtlQueryTimeZoneInformation(LPTIME_ZONE_INFORMATION tzinfo)
 904 {
 905     time_t gmt;
 906     int bias, daylight;
 907     const WCHAR *psTZ;
 908
 909     memset(tzinfo, 0, sizeof(TIME_ZONE_INFORMATION));
 910
 911     if( !TIME_GetTimeZoneInfoFromReg(tzinfo)) {
 912
 913         gmt = time(NULL);
 914         bias = TIME_GetBias(gmt, &daylight);
 915
 916         tzinfo->Bias = -bias / 60;
 917         tzinfo->StandardBias = 0;
 918         tzinfo->DaylightBias = -60;
 919         tzinfo->StandardName[0]='\0';
 920         tzinfo->DaylightName[0]='\0';
 921         psTZ = TIME_GetTZAsStr (gmt, (-bias/60), daylight);
 922         if (psTZ) strcpyW( tzinfo->StandardName, psTZ );
 923         }
 924     return STATUS_SUCCESS;
 925 }
 926
 927 /***********************************************************************
 928  *       RtlSetTimeZoneInformation [NTDLL.@]
 929  *
 930  * Set the current time zone information.
 931  *
 932  * PARAMS
 933  *   tzinfo [I] Timezone information to set.
 934  *
 935  * RETURNS
 936  *   Success: STATUS_SUCCESS.
 937  *   Failure: An NTSTATUS error code indicating the problem.
 938  *
 939  * BUGS
 940  *   Uses the obsolete unix timezone structure and tz_dsttime member.
 941  */
 942 NTSTATUS WINAPI RtlSetTimeZoneInformation( const TIME_ZONE_INFORMATION *tzinfo )
 943 {
 944 #ifdef HAVE_SETTIMEOFDAY
 945     struct timezone tz;
 946
 947     tz.tz_minuteswest = tzinfo->Bias;
 948 #ifdef DST_NONE
 949     tz.tz_dsttime = DST_NONE;
 950 #else
 951     tz.tz_dsttime = 0;
 952 #endif
 953     if(!settimeofday(NULL, &tz))
 954         return STATUS_SUCCESS;
 955 #endif
 956     return STATUS_PRIVILEGE_NOT_HELD;
 957 }
 958
 959 /***********************************************************************
 960  *        NtSetSystemTime [NTDLL.@]
 961  *        ZwSetSystemTime [NTDLL.@]
 962  *
 963  * Set the system time.
 964  *
 965  * PARAMS
 966  *   NewTime [I] The time to set.
 967  *   OldTime [O] Optional destination for the previous system time.
 968  *
 969  * RETURNS
 970  *   Success: STATUS_SUCCESS.
 971  *   Failure: An NTSTATUS error code indicating the problem.
 972  */
 973 NTSTATUS WINAPI NtSetSystemTime(const LARGE_INTEGER *NewTime, LARGE_INTEGER *OldTime)
 974 {
 975     TIME_FIELDS tf;
 976     struct timeval tv;
 977     struct timezone tz;
 978     struct tm t;
 979     time_t sec, oldsec;
 980     int dst, bias;
 981     int err;
 982
 983     /* Return the old time if necessary */
 984     if(OldTime)
 985         NtQuerySystemTime(OldTime);
 986
 987     RtlTimeToTimeFields(NewTime, &tf);
 988
 989     /* call gettimeofday to get the current timezone */
 990     gettimeofday(&tv, &tz);
 991     oldsec = tv.tv_sec;
 992     /* get delta local time from utc */
 993     bias = TIME_GetBias(oldsec, &dst);
 994
 995     /* get the number of seconds */
 996     t.tm_sec = tf.Second;
 997     t.tm_min = tf.Minute;
 998     t.tm_hour = tf.Hour;
 999     t.tm_mday = tf.Day;
1000     t.tm_mon = tf.Month - 1;
1001     t.tm_year = tf.Year - 1900;
1002     t.tm_isdst = dst;
1003     sec = mktime (&t);
1004     /* correct for timezone and daylight */
1005     sec += bias;
1006
1007     /* set the new time */
1008     tv.tv_sec = sec;
1009     tv.tv_usec = tf.Milliseconds * 1000;
1010
1011     /* error and sanity check*/
1012     if(sec == (time_t)-1 || abs((int)(sec-oldsec)) > SETTIME_MAX_ADJUST) {
1013         err = 2;
1014     } else {
1015 #ifdef HAVE_SETTIMEOFDAY
1016         err = settimeofday(&tv, NULL); /* 0 is OK, -1 is error */
1017         if(err == 0)
1018             return STATUS_SUCCESS;
1019 #else
1020         err = 1;
1021 #endif
1022     }
1023
1024     ERR("Cannot set time to %d/%d/%d %d:%d:%d Time adjustment %ld %s\n",
1025             tf.Year, tf.Month, tf.Day, tf.Hour, tf.Minute, tf.Second,
1026             (long)(sec-oldsec),
1027             err == -1 ? "No Permission"
1028                       : sec == (time_t)-1 ? "" : "is too large." );
1029
1030     if(err == 2)
1031         return STATUS_INVALID_PARAMETER;
1032     else if(err == -1)
1033         return STATUS_PRIVILEGE_NOT_HELD;
1034     else
1035         return STATUS_NOT_IMPLEMENTED;
1036 }