dlls/msvcrt/time.c

   1 /*
   2  * msvcrt.dll date/time functions
   3  *
   4  * Copyright 1996,1998 Marcus Meissner
   5  * Copyright 1996 Jukka Iivonen
   6  * Copyright 1997,2000 Uwe Bonnes
   7  * Copyright 2000 Jon Griffiths
   8  * Copyright 2004 Hans Leidekker
   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
  27 #include <time.h>
  28 #ifdef HAVE_SYS_TIMES_H
  29 # include <sys/times.h>
  30 #endif
  31 #include <limits.h>
  32
  33 #include "msvcrt.h"
  34 #include "winbase.h"
  35 #include "wine/debug.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
  38
  39 static const int MonthLengths[2][12] =
  40 {
  41     { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
  42     { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
  43 };
  44
  45 static inline int IsLeapYear(int Year)
  46 {
  47     return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0);
  48 }
  49
  50 static inline void msvcrt_tm_to_unix( struct tm *dest, const struct MSVCRT_tm *src )
  51 {
  52     memset( dest, 0, sizeof(*dest) );
  53     dest->tm_sec   = src->tm_sec;
  54     dest->tm_min   = src->tm_min;
  55     dest->tm_hour  = src->tm_hour;
  56     dest->tm_mday  = src->tm_mday;
  57     dest->tm_mon   = src->tm_mon;
  58     dest->tm_year  = src->tm_year;
  59     dest->tm_wday  = src->tm_wday;
  60     dest->tm_yday  = src->tm_yday;
  61     dest->tm_isdst = src->tm_isdst;
  62 }
  63
  64 #define SECSPERDAY        86400
  65 /* 1601 to 1970 is 369 years plus 89 leap days */
  66 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
  67 #define TICKSPERSEC       10000000
  68 #define TICKSPERMSEC      10000
  69 #define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
  70
  71 /**********************************************************************
  72  *              mktime (MSVCRT.@)
  73  */
  74 MSVCRT_time_t MSVCRT_mktime(struct MSVCRT_tm *t)
  75 {
  76     MSVCRT_time_t secs;
  77     FILETIME lft, uft;
  78     ULONGLONG time;
  79     struct MSVCRT_tm ts, *ptm;
  80     int cleaps, day;
  81
  82     ts=*t;
  83     /* to prevent arithmetic overflows put constraints on some fields */
  84     /* whether the effective date falls in the 1970-2038 time period */
  85     /* will be tested later */
  86     /* BTW, I have no idea what limits native msvcrt has. */
  87     if ( ts.tm_year < 0 || ts.tm_year > 140  ||
  88             ts.tm_mon < -840 || ts.tm_mon > 840 ||
  89             ts.tm_mday < -20160 || ts.tm_mday > 20160 ||
  90             ts.tm_hour < -484000 || ts.tm_hour > 484000 ||
  91             ts.tm_min < -29000000 || ts.tm_min > 29000000 )
  92         return -1;
  93
  94     /* normalize the tm month fields */
  95     if( ts.tm_mon > 11) { ts.tm_year += ts.tm_mon / 12; ts.tm_mon %= 12; }
  96     if( ts.tm_mon < 0) {
  97         int dy = (11 - ts.tm_mon) / 12;
  98         ts.tm_year -= dy;
  99         ts.tm_mon += dy * 12;
 100     }
 101     /* now calculate a day count from the date
 102      * First start counting years from March. This way the leap days
 103      * are added at the end of the year, not somewhere in the middle.
 104      * Formula's become so much less complicate that way.
 105      * To convert: add 12 to the month numbers of Jan and Feb, and
 106      * take 1 from the year */
 107     if(ts.tm_mon < 2) {
 108         ts.tm_mon += 14;
 109         ts.tm_year += 1899;
 110     } else {
 111         ts.tm_mon += 2;
 112         ts.tm_year += 1900;
 113     }
 114     cleaps = (3 * (ts.tm_year / 100) + 3) / 4;   /* nr of "century leap years"*/
 115     day =  (36525 * ts.tm_year) / 100 - cleaps + /* year * dayperyr, corrected*/
 116              (1959 * ts.tm_mon) / 64 +    /* months * daypermonth */
 117              ts.tm_mday -                 /* day of the month */
 118              584817 ;                     /* zero that on 1601-01-01 */
 119     /* done */
 120
 121     /* convert to 100 ns ticks */
 122     time = ((((ULONGLONG) day * 24 +
 123             ts.tm_hour) * 60 +
 124             ts.tm_min) * 60 +
 125             ts.tm_sec ) * TICKSPERSEC;
 126
 127     lft.dwHighDateTime = (DWORD) (time >> 32);
 128     lft.dwLowDateTime = (DWORD) time;
 129
 130     LocalFileTimeToFileTime(&lft, &uft);
 131
 132     time = ((ULONGLONG)uft.dwHighDateTime << 32) | uft.dwLowDateTime;
 133     time /= TICKSPERSEC;
 134     if( time < SECS_1601_TO_1970 || time > (SECS_1601_TO_1970 + INT_MAX))
 135         return -1;
 136     secs = time - SECS_1601_TO_1970;
 137     /* compute tm_wday, tm_yday and renormalize the other fields of the
 138      * tm structure */
 139     if ((ptm = MSVCRT_localtime( &secs ))) *t = *ptm;
 140
 141     return secs;
 142 }
 143
 144 /*********************************************************************
 145  *      localtime (MSVCRT.@)
 146  */
 147 struct MSVCRT_tm* MSVCRT_localtime(const MSVCRT_time_t* secs)
 148 {
 149   thread_data_t * const data = msvcrt_get_thread_data();
 150   int i;
 151   FILETIME ft, lft;
 152   SYSTEMTIME st;
 153   DWORD tzid;
 154   TIME_ZONE_INFORMATION tzinfo;
 155
 156   ULONGLONG time = *secs * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 157
 158   ft.dwHighDateTime = (UINT)(time >> 32);
 159   ft.dwLowDateTime  = (UINT)time;
 160
 161   FileTimeToLocalFileTime(&ft, &lft);
 162   FileTimeToSystemTime(&lft, &st);
 163
 164   if (st.wYear < 1970) return NULL;
 165
 166   data->time_buffer.tm_sec  = st.wSecond;
 167   data->time_buffer.tm_min  = st.wMinute;
 168   data->time_buffer.tm_hour = st.wHour;
 169   data->time_buffer.tm_mday = st.wDay;
 170   data->time_buffer.tm_year = st.wYear - 1900;
 171   data->time_buffer.tm_mon  = st.wMonth  - 1;
 172   data->time_buffer.tm_wday = st.wDayOfWeek;
 173
 174   for (i = data->time_buffer.tm_yday = 0; i < st.wMonth - 1; i++) {
 175     data->time_buffer.tm_yday += MonthLengths[IsLeapYear(st.wYear)][i];
 176   }
 177
 178   data->time_buffer.tm_yday += st.wDay - 1;
 179
 180   tzid = GetTimeZoneInformation(&tzinfo);
 181
 182   if (tzid == TIME_ZONE_ID_INVALID)
 183     data->time_buffer.tm_isdst = -1;
 184   else
 185     data->time_buffer.tm_isdst = (tzid == TIME_ZONE_ID_DAYLIGHT?1:0);
 186
 187   return &data->time_buffer;
 188 }
 189
 190 /*********************************************************************
 191  *      gmtime (MSVCRT.@)
 192  */
 193 struct MSVCRT_tm* MSVCRT_gmtime(const MSVCRT_time_t* secs)
 194 {
 195   thread_data_t * const data = msvcrt_get_thread_data();
 196   int i;
 197   FILETIME ft;
 198   SYSTEMTIME st;
 199
 200   ULONGLONG time = *secs * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 201
 202   ft.dwHighDateTime = (UINT)(time >> 32);
 203   ft.dwLowDateTime  = (UINT)time;
 204
 205   FileTimeToSystemTime(&ft, &st);
 206
 207   if (st.wYear < 1970) return NULL;
 208
 209   data->time_buffer.tm_sec  = st.wSecond;
 210   data->time_buffer.tm_min  = st.wMinute;
 211   data->time_buffer.tm_hour = st.wHour;
 212   data->time_buffer.tm_mday = st.wDay;
 213   data->time_buffer.tm_year = st.wYear - 1900;
 214   data->time_buffer.tm_mon  = st.wMonth - 1;
 215   data->time_buffer.tm_wday = st.wDayOfWeek;
 216   for (i = data->time_buffer.tm_yday = 0; i < st.wMonth - 1; i++) {
 217     data->time_buffer.tm_yday += MonthLengths[IsLeapYear(st.wYear)][i];
 218   }
 219
 220   data->time_buffer.tm_yday += st.wDay - 1;
 221   data->time_buffer.tm_isdst = 0;
 222
 223   return &data->time_buffer;
 224 }
 225
 226 /**********************************************************************
 227  *              _strdate (MSVCRT.@)
 228  */
 229 char* _strdate(char* date)
 230 {
 231   LPCSTR format = "MM'/'dd'/'yy";
 232
 233   GetDateFormatA(LOCALE_NEUTRAL, 0, NULL, format, date, 9);
 234
 235   return date;
 236 }
 237
 238 /**********************************************************************
 239  *              _wstrdate (MSVCRT.@)
 240  */
 241 MSVCRT_wchar_t* _wstrdate(MSVCRT_wchar_t* date)
 242 {
 243   static const WCHAR format[] = { 'M','M','\'','/','\'','d','d','\'','/','\'','y','y',0 };
 244
 245   GetDateFormatW(LOCALE_NEUTRAL, 0, NULL, format, (LPWSTR)date, 9);
 246
 247   return date;
 248 }
 249
 250 /*********************************************************************
 251  *              _strtime (MSVCRT.@)
 252  */
 253 char* _strtime(char* time)
 254 {
 255   LPCSTR format = "HH':'mm':'ss";
 256
 257   GetTimeFormatA(LOCALE_NEUTRAL, 0, NULL, format, time, 9);
 258
 259   return time;
 260 }
 261
 262 /*********************************************************************
 263  *              _wstrtime (MSVCRT.@)
 264  */
 265 MSVCRT_wchar_t* _wstrtime(MSVCRT_wchar_t* time)
 266 {
 267   static const WCHAR format[] = { 'H','H','\'',':','\'','m','m','\'',':','\'','s','s',0 };
 268
 269   GetTimeFormatW(LOCALE_NEUTRAL, 0, NULL, format, (LPWSTR)time, 9);
 270
 271   return time;
 272 }
 273
 274 /*********************************************************************
 275  *              clock (MSVCRT.@)
 276  */
 277 MSVCRT_clock_t MSVCRT_clock(void)
 278 {
 279   FILETIME ftc, fte, ftk, ftu;
 280   ULONGLONG utime, ktime;
 281
 282   MSVCRT_clock_t clock;
 283
 284   GetProcessTimes(GetCurrentProcess(), &ftc, &fte, &ftk, &ftu);
 285
 286   ktime = ((ULONGLONG)ftk.dwHighDateTime << 32) | ftk.dwLowDateTime;
 287   utime = ((ULONGLONG)ftu.dwHighDateTime << 32) | ftu.dwLowDateTime;
 288
 289   clock = (utime + ktime) / (TICKSPERSEC / MSVCRT_CLOCKS_PER_SEC);
 290
 291   return clock;
 292 }
 293
 294 /*********************************************************************
 295  *              difftime (MSVCRT.@)
 296  */
 297 double MSVCRT_difftime(MSVCRT_time_t time1, MSVCRT_time_t time2)
 298 {
 299   return (double)(time1 - time2);
 300 }
 301
 302 /*********************************************************************
 303  *              _ftime (MSVCRT.@)
 304  */
 305 void _ftime(struct MSVCRT__timeb *buf)
 306 {
 307   TIME_ZONE_INFORMATION tzinfo;
 308   FILETIME ft;
 309   ULONGLONG time;
 310
 311   DWORD tzid = GetTimeZoneInformation(&tzinfo);
 312   GetSystemTimeAsFileTime(&ft);
 313
 314   time = ((ULONGLONG)ft.dwHighDateTime << 32) | ft.dwLowDateTime;
 315
 316   buf->time = time / TICKSPERSEC - SECS_1601_TO_1970;
 317   buf->millitm = (time % TICKSPERSEC) / TICKSPERMSEC;
 318   buf->timezone = tzinfo.Bias +
 319       ( tzid == TIME_ZONE_ID_STANDARD ? tzinfo.StandardBias :
 320       ( tzid == TIME_ZONE_ID_DAYLIGHT ? tzinfo.DaylightBias : 0 ));
 321   buf->dstflag = (tzid == TIME_ZONE_ID_DAYLIGHT?1:0);
 322 }
 323
 324 /*********************************************************************
 325  *              time (MSVCRT.@)
 326  */
 327 MSVCRT_time_t MSVCRT_time(MSVCRT_time_t* buf)
 328 {
 329   MSVCRT_time_t curtime;
 330   struct MSVCRT__timeb tb;
 331
 332   _ftime(&tb);
 333
 334   curtime = tb.time;
 335   return buf ? *buf = curtime : curtime;
 336 }
 337
 338 /*********************************************************************
 339  *              _daylight (MSVCRT.@)
 340  */
 341 int MSVCRT___daylight = 0;
 342
 343 /*********************************************************************
 344  *              __p_daylight (MSVCRT.@)
 345  */
 346 int *MSVCRT___p__daylight(void)
 347 {
 348         return &MSVCRT___daylight;
 349 }
 350
 351 /*********************************************************************
 352  *              _dstbias (MSVCRT.@)
 353  */
 354 int MSVCRT__dstbias = 0;
 355
 356 /*********************************************************************
 357  *              __p_dstbias (MSVCRT.@)
 358  */
 359 int *__p__dstbias(void)
 360 {
 361     return &MSVCRT__dstbias;
 362 }
 363
 364 /*********************************************************************
 365  *              _timezone (MSVCRT.@)
 366  */
 367 long MSVCRT___timezone = 0;
 368
 369 /*********************************************************************
 370  *              __p_timezone (MSVCRT.@)
 371  */
 372 long *MSVCRT___p__timezone(void)
 373 {
 374         return &MSVCRT___timezone;
 375 }
 376
 377 /*********************************************************************
 378  *              _tzname (MSVCRT.@)
 379  * NOTES
 380  *  Some apps (notably Mozilla) insist on writing to these, so the buffer
 381  *  must be large enough.  The size is picked based on observation of
 382  *  Windows XP.
 383  */
 384 static char tzname_std[64] = "";
 385 static char tzname_dst[64] = "";
 386 char *MSVCRT__tzname[2] = { tzname_std, tzname_dst };
 387
 388 /*********************************************************************
 389  *              __p_tzname (MSVCRT.@)
 390  */
 391 char **__p__tzname(void)
 392 {
 393         return MSVCRT__tzname;
 394 }
 395
 396 /*********************************************************************
 397  *              _tzset (MSVCRT.@)
 398  */
 399 void MSVCRT__tzset(void)
 400 {
 401     tzset();
 402 #if defined(HAVE_TIMEZONE) && defined(HAVE_DAYLIGHT)
 403     MSVCRT___daylight = daylight;
 404     MSVCRT___timezone = timezone;
 405 #else
 406     {
 407         static const time_t seconds_in_year = (365 * 24 + 6) * 3600;
 408         time_t t;
 409         struct tm *tmp;
 410         long zone_january, zone_july;
 411
 412         t = (time((time_t *)0) / seconds_in_year) * seconds_in_year;
 413         tmp = localtime(&t);
 414         zone_january = -tmp->tm_gmtoff;
 415         t += seconds_in_year / 2;
 416         tmp = localtime(&t);
 417         zone_july = -tmp->tm_gmtoff;
 418         MSVCRT___daylight = (zone_january != zone_july);
 419         MSVCRT___timezone = max(zone_january, zone_july);
 420     }
 421 #endif
 422     lstrcpynA(tzname_std, tzname[0], sizeof(tzname_std));
 423     tzname_std[sizeof(tzname_std) - 1] = '\0';
 424     lstrcpynA(tzname_dst, tzname[1], sizeof(tzname_dst));
 425     tzname_dst[sizeof(tzname_dst) - 1] = '\0';
 426 }
 427
 428 /*********************************************************************
 429  *              strftime (MSVCRT.@)
 430  */
 431 MSVCRT_size_t MSVCRT_strftime( char *str, MSVCRT_size_t max, const char *format,
 432                                const struct MSVCRT_tm *mstm )
 433 {
 434     struct tm tm;
 435
 436     msvcrt_tm_to_unix( &tm, mstm );
 437     return strftime( str, max, format, &tm );
 438 }
 439
 440 /*********************************************************************
 441  *              wcsftime (MSVCRT.@)
 442  */
 443 MSVCRT_size_t MSVCRT_wcsftime( MSVCRT_wchar_t *str, MSVCRT_size_t max,
 444                                const MSVCRT_wchar_t *format, const struct MSVCRT_tm *mstm )
 445 {
 446     FIXME( "%p, %d, %s, %p - stub\n", str, max, debugstr_w(format), mstm );
 447
 448     *str = '\0';
 449     return 0;
 450 }
 451
 452 /*********************************************************************
 453  *              asctime (MSVCRT.@)
 454  */
 455 char *MSVCRT_asctime(const struct MSVCRT_tm *mstm)
 456 {
 457     thread_data_t *data = msvcrt_get_thread_data();
 458     struct tm tm;
 459
 460     msvcrt_tm_to_unix( &tm, mstm );
 461
 462     if (!data->asctime_buffer)
 463         data->asctime_buffer = MSVCRT_malloc( 30 ); /* ought to be enough */
 464
 465     /* FIXME: may want to map from Unix codepage to CP_ACP */
 466 #ifdef HAVE_ASCTIME_R
 467     asctime_r( &tm, data->asctime_buffer );
 468 #else
 469     strcpy( data->asctime_buffer, asctime(&tm) );
 470 #endif
 471     return data->asctime_buffer;
 472 }
 473
 474 /*********************************************************************
 475  *              _wasctime (MSVCRT.@)
 476  */
 477 MSVCRT_wchar_t *MSVCRT__wasctime(const struct MSVCRT_tm *mstm)
 478 {
 479     thread_data_t *data = msvcrt_get_thread_data();
 480     struct tm tm;
 481     char buffer[30];
 482
 483     msvcrt_tm_to_unix( &tm, mstm );
 484
 485     if (!data->wasctime_buffer)
 486         data->wasctime_buffer = MSVCRT_malloc( 30*sizeof(MSVCRT_wchar_t) ); /* ought to be enough */
 487 #ifdef HAVE_ASCTIME_R
 488     asctime_r( &tm, buffer );
 489 #else
 490     strcpy( buffer, asctime(&tm) );
 491 #endif
 492     MultiByteToWideChar( CP_UNIXCP, 0, buffer, -1, data->wasctime_buffer, 30 );
 493     return data->wasctime_buffer;
 494 }
 495
 496 /*********************************************************************
 497  *              ctime (MSVCRT.@)
 498  */
 499 char *MSVCRT_ctime(const MSVCRT_time_t *time)
 500 {
 501     return MSVCRT_asctime( MSVCRT_localtime(time) );
 502 }
 503
 504 /*********************************************************************
 505  *              _wctime (MSVCRT.@)
 506  */
 507 MSVCRT_wchar_t *MSVCRT__wctime(const MSVCRT_time_t *time)
 508 {
 509     return MSVCRT__wasctime( MSVCRT_localtime(time) );
 510 }