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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  23  */
  24
  25 #include "config.h"
  26
  27 #define _POSIX_PTHREAD_SEMANTICS /* switch to a 2 arg style asctime_r on Solaris */
  28 #include <time.h>
  29 #ifdef HAVE_SYS_TIMES_H
  30 # include <sys/times.h>
  31 #endif
  32 #include <limits.h>
  33
  34 #include "msvcrt.h"
  35 #include "winbase.h"
  36 #include "winnls.h"
  37 #include "wine/debug.h"
  38
  39 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
  40
  41 static const int MonthLengths[2][12] =
  42 {
  43     { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
  44     { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
  45 };
  46
  47 static inline int IsLeapYear(int Year)
  48 {
  49     return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0);
  50 }
  51
  52 static inline void msvcrt_tm_to_unix( struct tm *dest, const struct MSVCRT_tm *src )
  53 {
  54     memset( dest, 0, sizeof(*dest) );
  55     dest->tm_sec   = src->tm_sec;
  56     dest->tm_min   = src->tm_min;
  57     dest->tm_hour  = src->tm_hour;
  58     dest->tm_mday  = src->tm_mday;
  59     dest->tm_mon   = src->tm_mon;
  60     dest->tm_year  = src->tm_year;
  61     dest->tm_wday  = src->tm_wday;
  62     dest->tm_yday  = src->tm_yday;
  63     dest->tm_isdst = src->tm_isdst;
  64 }
  65
  66 #define SECSPERDAY        86400
  67 /* 1601 to 1970 is 369 years plus 89 leap days */
  68 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
  69 #define TICKSPERSEC       10000000
  70 #define TICKSPERMSEC      10000
  71 #define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
  72
  73 /**********************************************************************
  74  *              mktime (MSVCRT.@)
  75  */
  76 MSVCRT_time_t CDECL MSVCRT_mktime(struct MSVCRT_tm *t)
  77 {
  78     MSVCRT_time_t secs;
  79     FILETIME lft, uft;
  80     ULONGLONG time;
  81     struct MSVCRT_tm ts, *ptm;
  82     int cleaps, day;
  83
  84     ts=*t;
  85     /* to prevent arithmetic overflows put constraints on some fields */
  86     /* whether the effective date falls in the 1970-2038 time period */
  87     /* will be tested later */
  88     /* BTW, I have no idea what limits native msvcrt has. */
  89     if ( ts.tm_year < 0 || ts.tm_year > 140  ||
  90             ts.tm_mon < -840 || ts.tm_mon > 840 ||
  91             ts.tm_mday < -20160 || ts.tm_mday > 20160 ||
  92             ts.tm_hour < -484000 || ts.tm_hour > 484000 ||
  93             ts.tm_min < -29000000 || ts.tm_min > 29000000 )
  94         return -1;
  95
  96     /* normalize the tm month fields */
  97     if( ts.tm_mon > 11) { ts.tm_year += ts.tm_mon / 12; ts.tm_mon %= 12; }
  98     if( ts.tm_mon < 0) {
  99         int dy = (11 - ts.tm_mon) / 12;
 100         ts.tm_year -= dy;
 101         ts.tm_mon += dy * 12;
 102     }
 103     /* now calculate a day count from the date
 104      * First start counting years from March. This way the leap days
 105      * are added at the end of the year, not somewhere in the middle.
 106      * Formula's become so much less complicate that way.
 107      * To convert: add 12 to the month numbers of Jan and Feb, and
 108      * take 1 from the year */
 109     if(ts.tm_mon < 2) {
 110         ts.tm_mon += 14;
 111         ts.tm_year += 1899;
 112     } else {
 113         ts.tm_mon += 2;
 114         ts.tm_year += 1900;
 115     }
 116     cleaps = (3 * (ts.tm_year / 100) + 3) / 4;   /* nr of "century leap years"*/
 117     day =  (36525 * ts.tm_year) / 100 - cleaps + /* year * dayperyr, corrected*/
 118              (1959 * ts.tm_mon) / 64 +    /* months * daypermonth */
 119              ts.tm_mday -                 /* day of the month */
 120              584817 ;                     /* zero that on 1601-01-01 */
 121     /* done */
 122
 123     /* convert to 100 ns ticks */
 124     time = ((((ULONGLONG) day * 24 +
 125             ts.tm_hour) * 60 +
 126             ts.tm_min) * 60 +
 127             ts.tm_sec ) * TICKSPERSEC;
 128
 129     lft.dwHighDateTime = (DWORD) (time >> 32);
 130     lft.dwLowDateTime = (DWORD) time;
 131
 132     LocalFileTimeToFileTime(&lft, &uft);
 133
 134     time = ((ULONGLONG)uft.dwHighDateTime << 32) | uft.dwLowDateTime;
 135     time /= TICKSPERSEC;
 136     if( time < SECS_1601_TO_1970 || time > (SECS_1601_TO_1970 + INT_MAX))
 137         return -1;
 138     secs = time - SECS_1601_TO_1970;
 139     /* compute tm_wday, tm_yday and renormalize the other fields of the
 140      * tm structure */
 141     if ((ptm = MSVCRT_localtime( &secs ))) *t = *ptm;
 142
 143     return secs;
 144 }
 145
 146 /*********************************************************************
 147  *      localtime (MSVCRT.@)
 148  */
 149 struct MSVCRT_tm* CDECL MSVCRT_localtime(const MSVCRT_time_t* secs)
 150 {
 151   thread_data_t * const data = msvcrt_get_thread_data();
 152   int i;
 153   FILETIME ft, lft;
 154   SYSTEMTIME st;
 155   DWORD tzid;
 156   TIME_ZONE_INFORMATION tzinfo;
 157   ULONGLONG time;
 158
 159   /* time < 0 means a date before midnight of January 1, 1970 */
 160   if (*secs < 0) return NULL;
 161
 162   time = *secs * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 163
 164   ft.dwHighDateTime = (UINT)(time >> 32);
 165   ft.dwLowDateTime  = (UINT)time;
 166
 167   FileTimeToLocalFileTime(&ft, &lft);
 168   FileTimeToSystemTime(&lft, &st);
 169
 170   data->time_buffer.tm_sec  = st.wSecond;
 171   data->time_buffer.tm_min  = st.wMinute;
 172   data->time_buffer.tm_hour = st.wHour;
 173   data->time_buffer.tm_mday = st.wDay;
 174   data->time_buffer.tm_year = st.wYear - 1900;
 175   data->time_buffer.tm_mon  = st.wMonth  - 1;
 176   data->time_buffer.tm_wday = st.wDayOfWeek;
 177
 178   for (i = data->time_buffer.tm_yday = 0; i < st.wMonth - 1; i++) {
 179     data->time_buffer.tm_yday += MonthLengths[IsLeapYear(st.wYear)][i];
 180   }
 181
 182   data->time_buffer.tm_yday += st.wDay - 1;
 183
 184   tzid = GetTimeZoneInformation(&tzinfo);
 185
 186   if (tzid == TIME_ZONE_ID_INVALID)
 187     data->time_buffer.tm_isdst = -1;
 188   else
 189     data->time_buffer.tm_isdst = (tzid == TIME_ZONE_ID_DAYLIGHT?1:0);
 190
 191   return &data->time_buffer;
 192 }
 193
 194 /*********************************************************************
 195  *      gmtime (MSVCRT.@)
 196  */
 197 struct MSVCRT_tm* CDECL MSVCRT_gmtime(const MSVCRT_time_t* secs)
 198 {
 199   thread_data_t * const data = msvcrt_get_thread_data();
 200   int i;
 201   FILETIME ft;
 202   SYSTEMTIME st;
 203
 204   ULONGLONG time = *secs * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 205
 206   ft.dwHighDateTime = (UINT)(time >> 32);
 207   ft.dwLowDateTime  = (UINT)time;
 208
 209   FileTimeToSystemTime(&ft, &st);
 210
 211   if (st.wYear < 1970) return NULL;
 212
 213   data->time_buffer.tm_sec  = st.wSecond;
 214   data->time_buffer.tm_min  = st.wMinute;
 215   data->time_buffer.tm_hour = st.wHour;
 216   data->time_buffer.tm_mday = st.wDay;
 217   data->time_buffer.tm_year = st.wYear - 1900;
 218   data->time_buffer.tm_mon  = st.wMonth - 1;
 219   data->time_buffer.tm_wday = st.wDayOfWeek;
 220   for (i = data->time_buffer.tm_yday = 0; i < st.wMonth - 1; i++) {
 221     data->time_buffer.tm_yday += MonthLengths[IsLeapYear(st.wYear)][i];
 222   }
 223
 224   data->time_buffer.tm_yday += st.wDay - 1;
 225   data->time_buffer.tm_isdst = 0;
 226
 227   return &data->time_buffer;
 228 }
 229
 230 /**********************************************************************
 231  *              _strdate (MSVCRT.@)
 232  */
 233 char* CDECL _strdate(char* date)
 234 {
 235   LPCSTR format = "MM'/'dd'/'yy";
 236
 237   GetDateFormatA(LOCALE_NEUTRAL, 0, NULL, format, date, 9);
 238
 239   return date;
 240 }
 241
 242 /**********************************************************************
 243  *              _wstrdate (MSVCRT.@)
 244  */
 245 MSVCRT_wchar_t* CDECL _wstrdate(MSVCRT_wchar_t* date)
 246 {
 247   static const WCHAR format[] = { 'M','M','\'','/','\'','d','d','\'','/','\'','y','y',0 };
 248
 249   GetDateFormatW(LOCALE_NEUTRAL, 0, NULL, format, (LPWSTR)date, 9);
 250
 251   return date;
 252 }
 253
 254 /*********************************************************************
 255  *              _strtime (MSVCRT.@)
 256  */
 257 char* CDECL _strtime(char* time)
 258 {
 259   LPCSTR format = "HH':'mm':'ss";
 260
 261   GetTimeFormatA(LOCALE_NEUTRAL, 0, NULL, format, time, 9);
 262
 263   return time;
 264 }
 265
 266 /*********************************************************************
 267  *              _wstrtime (MSVCRT.@)
 268  */
 269 MSVCRT_wchar_t* CDECL _wstrtime(MSVCRT_wchar_t* time)
 270 {
 271   static const WCHAR format[] = { 'H','H','\'',':','\'','m','m','\'',':','\'','s','s',0 };
 272
 273   GetTimeFormatW(LOCALE_NEUTRAL, 0, NULL, format, (LPWSTR)time, 9);
 274
 275   return time;
 276 }
 277
 278 /*********************************************************************
 279  *              clock (MSVCRT.@)
 280  */
 281 MSVCRT_clock_t CDECL MSVCRT_clock(void)
 282 {
 283   FILETIME ftc, fte, ftk, ftu;
 284   ULONGLONG utime, ktime;
 285
 286   MSVCRT_clock_t clock;
 287
 288   GetProcessTimes(GetCurrentProcess(), &ftc, &fte, &ftk, &ftu);
 289
 290   ktime = ((ULONGLONG)ftk.dwHighDateTime << 32) | ftk.dwLowDateTime;
 291   utime = ((ULONGLONG)ftu.dwHighDateTime << 32) | ftu.dwLowDateTime;
 292
 293   clock = (utime + ktime) / (TICKSPERSEC / MSVCRT_CLOCKS_PER_SEC);
 294
 295   return clock;
 296 }
 297
 298 /*********************************************************************
 299  *              difftime (MSVCRT.@)
 300  */
 301 double CDECL MSVCRT_difftime(MSVCRT_time_t time1, MSVCRT_time_t time2)
 302 {
 303   return (double)(time1 - time2);
 304 }
 305
 306 /*********************************************************************
 307  *              _ftime (MSVCRT.@)
 308  */
 309 void CDECL _ftime(struct MSVCRT__timeb *buf)
 310 {
 311   TIME_ZONE_INFORMATION tzinfo;
 312   FILETIME ft;
 313   ULONGLONG time;
 314
 315   DWORD tzid = GetTimeZoneInformation(&tzinfo);
 316   GetSystemTimeAsFileTime(&ft);
 317
 318   time = ((ULONGLONG)ft.dwHighDateTime << 32) | ft.dwLowDateTime;
 319
 320   buf->time = time / TICKSPERSEC - SECS_1601_TO_1970;
 321   buf->millitm = (time % TICKSPERSEC) / TICKSPERMSEC;
 322   buf->timezone = tzinfo.Bias +
 323       ( tzid == TIME_ZONE_ID_STANDARD ? tzinfo.StandardBias :
 324       ( tzid == TIME_ZONE_ID_DAYLIGHT ? tzinfo.DaylightBias : 0 ));
 325   buf->dstflag = (tzid == TIME_ZONE_ID_DAYLIGHT?1:0);
 326 }
 327
 328 /*********************************************************************
 329  *              time (MSVCRT.@)
 330  */
 331 MSVCRT_time_t CDECL MSVCRT_time(MSVCRT_time_t* buf)
 332 {
 333   MSVCRT_time_t curtime;
 334   struct MSVCRT__timeb tb;
 335
 336   _ftime(&tb);
 337
 338   curtime = tb.time;
 339   return buf ? *buf = curtime : curtime;
 340 }
 341
 342 /*********************************************************************
 343  *              _daylight (MSVCRT.@)
 344  */
 345 int MSVCRT___daylight = 0;
 346
 347 /*********************************************************************
 348  *              __p_daylight (MSVCRT.@)
 349  */
 350 int * CDECL MSVCRT___p__daylight(void)
 351 {
 352         return &MSVCRT___daylight;
 353 }
 354
 355 /*********************************************************************
 356  *              _dstbias (MSVCRT.@)
 357  */
 358 int MSVCRT__dstbias = 0;
 359
 360 /*********************************************************************
 361  *              __p_dstbias (MSVCRT.@)
 362  */
 363 int * CDECL __p__dstbias(void)
 364 {
 365     return &MSVCRT__dstbias;
 366 }
 367
 368 /*********************************************************************
 369  *              _timezone (MSVCRT.@)
 370  */
 371 long MSVCRT___timezone = 0;
 372
 373 /*********************************************************************
 374  *              __p_timezone (MSVCRT.@)
 375  */
 376 long * CDECL MSVCRT___p__timezone(void)
 377 {
 378         return &MSVCRT___timezone;
 379 }
 380
 381 /*********************************************************************
 382  *              _tzname (MSVCRT.@)
 383  * NOTES
 384  *  Some apps (notably Mozilla) insist on writing to these, so the buffer
 385  *  must be large enough.  The size is picked based on observation of
 386  *  Windows XP.
 387  */
 388 static char tzname_std[64] = "";
 389 static char tzname_dst[64] = "";
 390 char *MSVCRT__tzname[2] = { tzname_std, tzname_dst };
 391
 392 /*********************************************************************
 393  *              __p_tzname (MSVCRT.@)
 394  */
 395 char ** CDECL __p__tzname(void)
 396 {
 397         return MSVCRT__tzname;
 398 }
 399
 400 /*********************************************************************
 401  *              _tzset (MSVCRT.@)
 402  */
 403 void CDECL MSVCRT__tzset(void)
 404 {
 405     tzset();
 406 #if defined(HAVE_TIMEZONE) && defined(HAVE_DAYLIGHT)
 407     MSVCRT___daylight = daylight;
 408     MSVCRT___timezone = timezone;
 409 #else
 410     {
 411         static const time_t seconds_in_year = (365 * 24 + 6) * 3600;
 412         time_t t;
 413         struct tm *tmp;
 414         long zone_january, zone_july;
 415
 416         t = (time((time_t *)0) / seconds_in_year) * seconds_in_year;
 417         tmp = localtime(&t);
 418         zone_january = -tmp->tm_gmtoff;
 419         t += seconds_in_year / 2;
 420         tmp = localtime(&t);
 421         zone_july = -tmp->tm_gmtoff;
 422         MSVCRT___daylight = (zone_january != zone_july);
 423         MSVCRT___timezone = max(zone_january, zone_july);
 424     }
 425 #endif
 426     lstrcpynA(tzname_std, tzname[0], sizeof(tzname_std));
 427     tzname_std[sizeof(tzname_std) - 1] = '\0';
 428     lstrcpynA(tzname_dst, tzname[1], sizeof(tzname_dst));
 429     tzname_dst[sizeof(tzname_dst) - 1] = '\0';
 430 }
 431
 432 /*********************************************************************
 433  *              strftime (MSVCRT.@)
 434  */
 435 MSVCRT_size_t CDECL MSVCRT_strftime( char *str, MSVCRT_size_t max, const char *format,
 436                                      const struct MSVCRT_tm *mstm )
 437 {
 438     struct tm tm;
 439
 440     msvcrt_tm_to_unix( &tm, mstm );
 441     return strftime( str, max, format, &tm );
 442 }
 443
 444 /*********************************************************************
 445  *              wcsftime (MSVCRT.@)
 446  */
 447 MSVCRT_size_t CDECL MSVCRT_wcsftime( MSVCRT_wchar_t *str, MSVCRT_size_t max,
 448                                      const MSVCRT_wchar_t *format, const struct MSVCRT_tm *mstm )
 449 {
 450     char *s, *fmt;
 451     MSVCRT_size_t len;
 452
 453     TRACE("%p %d %s %p\n", str, max, debugstr_w(format), mstm );
 454
 455     len = WideCharToMultiByte( CP_UNIXCP, 0, format, -1, NULL, 0, NULL, NULL );
 456     if (!(fmt = MSVCRT_malloc( len ))) return 0;
 457     WideCharToMultiByte( CP_UNIXCP, 0, format, -1, fmt, len, NULL, NULL );
 458
 459     if ((s = MSVCRT_malloc( max*4 )))
 460     {
 461         struct tm tm;
 462         msvcrt_tm_to_unix( &tm, mstm );
 463         if (!strftime( s, max*4, fmt, &tm )) s[0] = 0;
 464         len = MultiByteToWideChar( CP_UNIXCP, 0, s, -1, str, max );
 465         if (len) len--;
 466         MSVCRT_free( s );
 467     }
 468     else len = 0;
 469
 470     MSVCRT_free( fmt );
 471     return len;
 472 }
 473
 474 /*********************************************************************
 475  *              asctime (MSVCRT.@)
 476  */
 477 char * CDECL MSVCRT_asctime(const struct MSVCRT_tm *mstm)
 478 {
 479     thread_data_t *data = msvcrt_get_thread_data();
 480     struct tm tm;
 481
 482     msvcrt_tm_to_unix( &tm, mstm );
 483
 484     if (!data->asctime_buffer)
 485         data->asctime_buffer = MSVCRT_malloc( 30 ); /* ought to be enough */
 486
 487     /* FIXME: may want to map from Unix codepage to CP_ACP */
 488 #ifdef HAVE_ASCTIME_R
 489     asctime_r( &tm, data->asctime_buffer );
 490 #else
 491     strcpy( data->asctime_buffer, asctime(&tm) );
 492 #endif
 493     return data->asctime_buffer;
 494 }
 495
 496 /*********************************************************************
 497  *              _wasctime (MSVCRT.@)
 498  */
 499 MSVCRT_wchar_t * CDECL MSVCRT__wasctime(const struct MSVCRT_tm *mstm)
 500 {
 501     thread_data_t *data = msvcrt_get_thread_data();
 502     struct tm tm;
 503     char buffer[30];
 504
 505     msvcrt_tm_to_unix( &tm, mstm );
 506
 507     if (!data->wasctime_buffer)
 508         data->wasctime_buffer = MSVCRT_malloc( 30*sizeof(MSVCRT_wchar_t) ); /* ought to be enough */
 509 #ifdef HAVE_ASCTIME_R
 510     asctime_r( &tm, buffer );
 511 #else
 512     strcpy( buffer, asctime(&tm) );
 513 #endif
 514     MultiByteToWideChar( CP_UNIXCP, 0, buffer, -1, data->wasctime_buffer, 30 );
 515     return data->wasctime_buffer;
 516 }
 517
 518 /*********************************************************************
 519  *              ctime (MSVCRT.@)
 520  */
 521 char * CDECL MSVCRT_ctime(const MSVCRT_time_t *time)
 522 {
 523     return MSVCRT_asctime( MSVCRT_localtime(time) );
 524 }
 525
 526 /*********************************************************************
 527  *              _wctime (MSVCRT.@)
 528  */
 529 MSVCRT_wchar_t * CDECL MSVCRT__wctime(const MSVCRT_time_t *time)
 530 {
 531     return MSVCRT__wasctime( MSVCRT_localtime(time) );
 532 }