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 "mtdll.h"
  36 #include "winbase.h"
  37 #include "winnls.h"
  38 #include "wine/debug.h"
  39
  40 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
  41
  42 static const int MonthLengths[2][12] =
  43 {
  44     { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
  45     { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
  46 };
  47
  48 static inline int IsLeapYear(int Year)
  49 {
  50     return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0);
  51 }
  52
  53 static inline void msvcrt_tm_to_unix( struct tm *dest, const struct MSVCRT_tm *src )
  54 {
  55     memset( dest, 0, sizeof(*dest) );
  56     dest->tm_sec   = src->tm_sec;
  57     dest->tm_min   = src->tm_min;
  58     dest->tm_hour  = src->tm_hour;
  59     dest->tm_mday  = src->tm_mday;
  60     dest->tm_mon   = src->tm_mon;
  61     dest->tm_year  = src->tm_year;
  62     dest->tm_wday  = src->tm_wday;
  63     dest->tm_yday  = src->tm_yday;
  64     dest->tm_isdst = src->tm_isdst;
  65 }
  66
  67 static inline void unix_tm_to_msvcrt( struct MSVCRT_tm *dest, const struct tm *src )
  68 {
  69     memset( dest, 0, sizeof(*dest) );
  70     dest->tm_sec   = src->tm_sec;
  71     dest->tm_min   = src->tm_min;
  72     dest->tm_hour  = src->tm_hour;
  73     dest->tm_mday  = src->tm_mday;
  74     dest->tm_mon   = src->tm_mon;
  75     dest->tm_year  = src->tm_year;
  76     dest->tm_wday  = src->tm_wday;
  77     dest->tm_yday  = src->tm_yday;
  78     dest->tm_isdst = src->tm_isdst;
  79 }
  80
  81 #define SECSPERDAY        86400
  82 /* 1601 to 1970 is 369 years plus 89 leap days */
  83 #define SECS_1601_TO_1970  ((369 * 365 + 89) * (ULONGLONG)SECSPERDAY)
  84 #define TICKSPERSEC       10000000
  85 #define TICKSPERMSEC      10000
  86 #define TICKS_1601_TO_1970 (SECS_1601_TO_1970 * TICKSPERSEC)
  87
  88 /**********************************************************************
  89  *              _mktime64 (MSVCRT.@)
  90  */
  91 MSVCRT___time64_t CDECL MSVCRT__mktime64(struct MSVCRT_tm *mstm)
  92 {
  93     time_t secs;
  94     struct tm tm;
  95
  96     msvcrt_tm_to_unix( &tm, mstm );
  97     secs = mktime( &tm );
  98     unix_tm_to_msvcrt( mstm, &tm );
  99
 100     return secs < 0 ? -1 : secs;
 101 }
 102
 103 /**********************************************************************
 104  *              _mktime32 (MSVCRT.@)
 105  */
 106 MSVCRT___time32_t CDECL MSVCRT__mktime32(struct MSVCRT_tm *mstm)
 107 {
 108     return MSVCRT__mktime64( mstm );
 109 }
 110
 111 /**********************************************************************
 112  *              mktime (MSVCRT.@)
 113  */
 114 #ifdef _WIN64
 115 MSVCRT___time64_t CDECL MSVCRT_mktime(struct MSVCRT_tm *mstm)
 116 {
 117     return MSVCRT__mktime64( mstm );
 118 }
 119 #else
 120 MSVCRT___time32_t CDECL MSVCRT_mktime(struct MSVCRT_tm *mstm)
 121 {
 122     return MSVCRT__mktime32( mstm );
 123 }
 124 #endif
 125
 126 /**********************************************************************
 127  *              _mkgmtime64 (MSVCRT.@)
 128  *
 129  * time->tm_isdst value is ignored
 130  */
 131 MSVCRT___time64_t CDECL MSVCRT__mkgmtime64(struct MSVCRT_tm *time)
 132 {
 133     SYSTEMTIME st;
 134     FILETIME ft;
 135     MSVCRT___time64_t ret;
 136     int i;
 137
 138     st.wMilliseconds = 0;
 139     st.wSecond = time->tm_sec;
 140     st.wMinute = time->tm_min;
 141     st.wHour = time->tm_hour;
 142     st.wDay = time->tm_mday;
 143     st.wMonth = time->tm_mon+1;
 144     st.wYear = time->tm_year+1900;
 145
 146     if(!SystemTimeToFileTime(&st, &ft))
 147         return -1;
 148
 149     FileTimeToSystemTime(&ft, &st);
 150     time->tm_wday = st.wDayOfWeek;
 151
 152     for(i=time->tm_yday=0; i<st.wMonth-1; i++)
 153         time->tm_yday += MonthLengths[IsLeapYear(st.wYear)][i];
 154     time->tm_yday += st.wDay-1;
 155
 156     ret = ((MSVCRT___time64_t)ft.dwHighDateTime<<32)+ft.dwLowDateTime;
 157     ret = (ret-TICKS_1601_TO_1970)/TICKSPERSEC;
 158     return ret;
 159 }
 160
 161 /**********************************************************************
 162  *              _mkgmtime32 (MSVCRT.@)
 163  */
 164 MSVCRT___time32_t CDECL MSVCRT__mkgmtime32(struct MSVCRT_tm *time)
 165 {
 166     return MSVCRT__mkgmtime64(time);
 167 }
 168
 169 /**********************************************************************
 170  *              _mkgmtime (MSVCRT.@)
 171  */
 172 #ifdef _WIN64
 173 MSVCRT___time64_t CDECL MSVCRT__mkgmtime(struct MSVCRT_tm *time)
 174 {
 175     return MSVCRT__mkgmtime64(time);
 176 }
 177 #else
 178 MSVCRT___time32_t CDECL MSVCRT__mkgmtime(struct MSVCRT_tm *time)
 179 {
 180     return MSVCRT__mkgmtime32(time);
 181 }
 182 #endif
 183
 184 /*********************************************************************
 185  *      _localtime64 (MSVCRT.@)
 186  */
 187 struct MSVCRT_tm* CDECL MSVCRT__localtime64(const MSVCRT___time64_t* secs)
 188 {
 189     struct tm *tm;
 190     thread_data_t *data;
 191     time_t seconds = *secs;
 192
 193     if (seconds < 0) return NULL;
 194
 195     _mlock(_TIME_LOCK);
 196     if (!(tm = localtime( &seconds))) {
 197         _munlock(_TIME_LOCK);
 198         return NULL;
 199     }
 200
 201     data = msvcrt_get_thread_data();
 202     unix_tm_to_msvcrt( &data->time_buffer, tm );
 203     _munlock(_TIME_LOCK);
 204
 205     return &data->time_buffer;
 206 }
 207
 208 /*********************************************************************
 209  *      _localtime32 (MSVCRT.@)
 210  */
 211 struct MSVCRT_tm* CDECL MSVCRT__localtime32(const MSVCRT___time32_t* secs)
 212 {
 213     MSVCRT___time64_t secs64 = *secs;
 214     return MSVCRT__localtime64( &secs64 );
 215 }
 216
 217 /*********************************************************************
 218  *      localtime (MSVCRT.@)
 219  */
 220 #ifdef _WIN64
 221 struct MSVCRT_tm* CDECL MSVCRT_localtime(const MSVCRT___time64_t* secs)
 222 {
 223     return MSVCRT__localtime64( secs );
 224 }
 225 #else
 226 struct MSVCRT_tm* CDECL MSVCRT_localtime(const MSVCRT___time32_t* secs)
 227 {
 228     return MSVCRT__localtime32( secs );
 229 }
 230 #endif
 231
 232 /*********************************************************************
 233  *      _gmtime64 (MSVCRT.@)
 234  */
 235 struct MSVCRT_tm* CDECL MSVCRT__gmtime64(const MSVCRT___time64_t* secs)
 236 {
 237   thread_data_t * const data = msvcrt_get_thread_data();
 238   int i;
 239   FILETIME ft;
 240   SYSTEMTIME st;
 241
 242   ULONGLONG time = *secs * (ULONGLONG)TICKSPERSEC + TICKS_1601_TO_1970;
 243
 244   ft.dwHighDateTime = (UINT)(time >> 32);
 245   ft.dwLowDateTime  = (UINT)time;
 246
 247   FileTimeToSystemTime(&ft, &st);
 248
 249   if (st.wYear < 1970) return NULL;
 250
 251   data->time_buffer.tm_sec  = st.wSecond;
 252   data->time_buffer.tm_min  = st.wMinute;
 253   data->time_buffer.tm_hour = st.wHour;
 254   data->time_buffer.tm_mday = st.wDay;
 255   data->time_buffer.tm_year = st.wYear - 1900;
 256   data->time_buffer.tm_mon  = st.wMonth - 1;
 257   data->time_buffer.tm_wday = st.wDayOfWeek;
 258   for (i = data->time_buffer.tm_yday = 0; i < st.wMonth - 1; i++) {
 259     data->time_buffer.tm_yday += MonthLengths[IsLeapYear(st.wYear)][i];
 260   }
 261
 262   data->time_buffer.tm_yday += st.wDay - 1;
 263   data->time_buffer.tm_isdst = 0;
 264
 265   return &data->time_buffer;
 266 }
 267
 268 /*********************************************************************
 269  *      _gmtime32 (MSVCRT.@)
 270  */
 271 struct MSVCRT_tm* CDECL MSVCRT__gmtime32(const MSVCRT___time32_t* secs)
 272 {
 273     MSVCRT___time64_t secs64 = *secs;
 274     return MSVCRT__gmtime64( &secs64 );
 275 }
 276
 277 /*********************************************************************
 278  *      gmtime (MSVCRT.@)
 279  */
 280 #ifdef _WIN64
 281 struct MSVCRT_tm* CDECL MSVCRT_gmtime(const MSVCRT___time64_t* secs)
 282 {
 283     return MSVCRT__gmtime64( secs );
 284 }
 285 #else
 286 struct MSVCRT_tm* CDECL MSVCRT_gmtime(const MSVCRT___time32_t* secs)
 287 {
 288     return MSVCRT__gmtime32( secs );
 289 }
 290 #endif
 291
 292 /**********************************************************************
 293  *              _strdate (MSVCRT.@)
 294  */
 295 char* CDECL _strdate(char* date)
 296 {
 297   static const char format[] = "MM'/'dd'/'yy";
 298
 299   GetDateFormatA(LOCALE_NEUTRAL, 0, NULL, format, date, 9);
 300
 301   return date;
 302 }
 303
 304 /**********************************************************************
 305  *              _wstrdate (MSVCRT.@)
 306  */
 307 MSVCRT_wchar_t* CDECL _wstrdate(MSVCRT_wchar_t* date)
 308 {
 309   static const WCHAR format[] = { 'M','M','\'','/','\'','d','d','\'','/','\'','y','y',0 };
 310
 311   GetDateFormatW(LOCALE_NEUTRAL, 0, NULL, format, date, 9);
 312
 313   return date;
 314 }
 315
 316 /*********************************************************************
 317  *              _strtime (MSVCRT.@)
 318  */
 319 char* CDECL _strtime(char* time)
 320 {
 321   static const char format[] = "HH':'mm':'ss";
 322
 323   GetTimeFormatA(LOCALE_NEUTRAL, 0, NULL, format, time, 9);
 324
 325   return time;
 326 }
 327
 328 /*********************************************************************
 329  *              _wstrtime (MSVCRT.@)
 330  */
 331 MSVCRT_wchar_t* CDECL _wstrtime(MSVCRT_wchar_t* time)
 332 {
 333   static const WCHAR format[] = { 'H','H','\'',':','\'','m','m','\'',':','\'','s','s',0 };
 334
 335   GetTimeFormatW(LOCALE_NEUTRAL, 0, NULL, format, time, 9);
 336
 337   return time;
 338 }
 339
 340 /*********************************************************************
 341  *              clock (MSVCRT.@)
 342  */
 343 MSVCRT_clock_t CDECL MSVCRT_clock(void)
 344 {
 345   FILETIME ftc, fte, ftk, ftu;
 346   ULONGLONG utime, ktime;
 347
 348   MSVCRT_clock_t clock;
 349
 350   GetProcessTimes(GetCurrentProcess(), &ftc, &fte, &ftk, &ftu);
 351
 352   ktime = ((ULONGLONG)ftk.dwHighDateTime << 32) | ftk.dwLowDateTime;
 353   utime = ((ULONGLONG)ftu.dwHighDateTime << 32) | ftu.dwLowDateTime;
 354
 355   clock = (utime + ktime) / (TICKSPERSEC / MSVCRT_CLOCKS_PER_SEC);
 356
 357   return clock;
 358 }
 359
 360 /*********************************************************************
 361  *              _difftime64 (MSVCRT.@)
 362  */
 363 double CDECL MSVCRT__difftime64(MSVCRT___time64_t time1, MSVCRT___time64_t time2)
 364 {
 365   return (double)(time1 - time2);
 366 }
 367
 368 /*********************************************************************
 369  *              _difftime32 (MSVCRT.@)
 370  */
 371 double CDECL MSVCRT__difftime32(MSVCRT___time32_t time1, MSVCRT___time32_t time2)
 372 {
 373   return (double)(time1 - time2);
 374 }
 375
 376 /*********************************************************************
 377  *              difftime (MSVCRT.@)
 378  */
 379 #ifdef _WIN64
 380 double CDECL MSVCRT_difftime(MSVCRT___time64_t time1, MSVCRT___time64_t time2)
 381 {
 382     return MSVCRT__difftime64( time1, time2 );
 383 }
 384 #else
 385 double CDECL MSVCRT_difftime(MSVCRT___time32_t time1, MSVCRT___time32_t time2)
 386 {
 387     return MSVCRT__difftime32( time1, time2 );
 388 }
 389 #endif
 390
 391 /*********************************************************************
 392  *              _ftime64 (MSVCRT.@)
 393  */
 394 void CDECL MSVCRT__ftime64(struct MSVCRT___timeb64 *buf)
 395 {
 396   TIME_ZONE_INFORMATION tzinfo;
 397   FILETIME ft;
 398   ULONGLONG time;
 399
 400   DWORD tzid = GetTimeZoneInformation(&tzinfo);
 401   GetSystemTimeAsFileTime(&ft);
 402
 403   time = ((ULONGLONG)ft.dwHighDateTime << 32) | ft.dwLowDateTime;
 404
 405   buf->time = time / TICKSPERSEC - SECS_1601_TO_1970;
 406   buf->millitm = (time % TICKSPERSEC) / TICKSPERMSEC;
 407   buf->timezone = tzinfo.Bias +
 408       ( tzid == TIME_ZONE_ID_STANDARD ? tzinfo.StandardBias :
 409       ( tzid == TIME_ZONE_ID_DAYLIGHT ? tzinfo.DaylightBias : 0 ));
 410   buf->dstflag = (tzid == TIME_ZONE_ID_DAYLIGHT?1:0);
 411 }
 412
 413 /*********************************************************************
 414  *              _ftime32 (MSVCRT.@)
 415  */
 416 void CDECL MSVCRT__ftime32(struct MSVCRT___timeb32 *buf)
 417 {
 418     struct MSVCRT___timeb64 buf64;
 419
 420     MSVCRT__ftime64( &buf64 );
 421     buf->time     = buf64.time;
 422     buf->millitm  = buf64.millitm;
 423     buf->timezone = buf64.timezone;
 424     buf->dstflag  = buf64.dstflag;
 425 }
 426
 427 /*********************************************************************
 428  *              _ftime (MSVCRT.@)
 429  */
 430 #ifdef _WIN64
 431 void CDECL MSVCRT__ftime(struct MSVCRT___timeb64 *buf)
 432 {
 433     return MSVCRT__ftime64( buf );
 434 }
 435 #else
 436 void CDECL MSVCRT__ftime(struct MSVCRT___timeb32 *buf)
 437 {
 438     return MSVCRT__ftime32( buf );
 439 }
 440 #endif
 441
 442 /*********************************************************************
 443  *              _time64 (MSVCRT.@)
 444  */
 445 MSVCRT___time64_t CDECL MSVCRT__time64(MSVCRT___time64_t *buf)
 446 {
 447     MSVCRT___time64_t curtime;
 448     struct MSVCRT___timeb64 tb;
 449
 450     MSVCRT__ftime64(&tb);
 451
 452     curtime = tb.time;
 453     return buf ? *buf = curtime : curtime;
 454 }
 455
 456 /*********************************************************************
 457  *              _time32 (MSVCRT.@)
 458  */
 459 MSVCRT___time32_t CDECL MSVCRT__time32(MSVCRT___time32_t *buf)
 460 {
 461     MSVCRT___time32_t curtime;
 462     struct MSVCRT___timeb64 tb;
 463
 464     MSVCRT__ftime64(&tb);
 465
 466     curtime = tb.time;
 467     return buf ? *buf = curtime : curtime;
 468 }
 469
 470 /*********************************************************************
 471  *              time (MSVCRT.@)
 472  */
 473 #ifdef _WIN64
 474 MSVCRT___time64_t CDECL MSVCRT_time(MSVCRT___time64_t* buf)
 475 {
 476     return MSVCRT__time64( buf );
 477 }
 478 #else
 479 MSVCRT___time32_t CDECL MSVCRT_time(MSVCRT___time32_t* buf)
 480 {
 481     return MSVCRT__time32( buf );
 482 }
 483 #endif
 484
 485 /*********************************************************************
 486  *              _daylight (MSVCRT.@)
 487  */
 488 int MSVCRT___daylight = 0;
 489
 490 /*********************************************************************
 491  *              __p_daylight (MSVCRT.@)
 492  */
 493 int * CDECL MSVCRT___p__daylight(void)
 494 {
 495         return &MSVCRT___daylight;
 496 }
 497
 498 /*********************************************************************
 499  *              _dstbias (MSVCRT.@)
 500  */
 501 int MSVCRT__dstbias = 0;
 502
 503 /*********************************************************************
 504  *              __p_dstbias (MSVCRT.@)
 505  */
 506 int * CDECL __p__dstbias(void)
 507 {
 508     return &MSVCRT__dstbias;
 509 }
 510
 511 /*********************************************************************
 512  *              _timezone (MSVCRT.@)
 513  */
 514 MSVCRT_long MSVCRT___timezone = 0;
 515
 516 /*********************************************************************
 517  *              __p_timezone (MSVCRT.@)
 518  */
 519 MSVCRT_long * CDECL MSVCRT___p__timezone(void)
 520 {
 521         return &MSVCRT___timezone;
 522 }
 523
 524 /*********************************************************************
 525  *              _tzname (MSVCRT.@)
 526  * NOTES
 527  *  Some apps (notably Mozilla) insist on writing to these, so the buffer
 528  *  must be large enough.  The size is picked based on observation of
 529  *  Windows XP.
 530  */
 531 static char tzname_std[64] = "";
 532 static char tzname_dst[64] = "";
 533 char *MSVCRT__tzname[2] = { tzname_std, tzname_dst };
 534
 535 /*********************************************************************
 536  *              __p_tzname (MSVCRT.@)
 537  */
 538 char ** CDECL __p__tzname(void)
 539 {
 540         return MSVCRT__tzname;
 541 }
 542
 543 /*********************************************************************
 544  *              _tzset (MSVCRT.@)
 545  */
 546 void CDECL MSVCRT__tzset(void)
 547 {
 548     tzset();
 549 #if defined(HAVE_TIMEZONE) && defined(HAVE_DAYLIGHT)
 550     MSVCRT___daylight = daylight;
 551     MSVCRT___timezone = timezone;
 552 #else
 553     {
 554         static const time_t seconds_in_year = (365 * 24 + 6) * 3600;
 555         time_t t;
 556         struct tm *tmp;
 557         int zone_january, zone_july;
 558
 559         _mlock(_TIME_LOCK);
 560         t = (time(NULL) / seconds_in_year) * seconds_in_year;
 561         tmp = localtime(&t);
 562         zone_january = -tmp->tm_gmtoff;
 563         t += seconds_in_year / 2;
 564         tmp = localtime(&t);
 565         zone_july = -tmp->tm_gmtoff;
 566         _munlock(_TIME_LOCK);
 567
 568         MSVCRT___daylight = (zone_january != zone_july);
 569         MSVCRT___timezone = max(zone_january, zone_july);
 570     }
 571 #endif
 572     lstrcpynA(tzname_std, tzname[0], sizeof(tzname_std));
 573     tzname_std[sizeof(tzname_std) - 1] = '\0';
 574     lstrcpynA(tzname_dst, tzname[1], sizeof(tzname_dst));
 575     tzname_dst[sizeof(tzname_dst) - 1] = '\0';
 576 }
 577
 578 /*********************************************************************
 579  *              strftime (MSVCRT.@)
 580  */
 581 MSVCRT_size_t CDECL MSVCRT_strftime( char *str, MSVCRT_size_t max, const char *format,
 582                                      const struct MSVCRT_tm *mstm )
 583 {
 584     struct tm tm;
 585
 586     msvcrt_tm_to_unix( &tm, mstm );
 587     return strftime( str, max, format, &tm );
 588 }
 589
 590 /*********************************************************************
 591  *              wcsftime (MSVCRT.@)
 592  */
 593 MSVCRT_size_t CDECL MSVCRT_wcsftime( MSVCRT_wchar_t *str, MSVCRT_size_t max,
 594                                      const MSVCRT_wchar_t *format, const struct MSVCRT_tm *mstm )
 595 {
 596     char *s, *fmt;
 597     MSVCRT_size_t len;
 598
 599     TRACE("%p %ld %s %p\n", str, max, debugstr_w(format), mstm );
 600
 601     len = WideCharToMultiByte( CP_UNIXCP, 0, format, -1, NULL, 0, NULL, NULL );
 602     if (!(fmt = MSVCRT_malloc( len ))) return 0;
 603     WideCharToMultiByte( CP_UNIXCP, 0, format, -1, fmt, len, NULL, NULL );
 604
 605     if ((s = MSVCRT_malloc( max*4 )))
 606     {
 607         struct tm tm;
 608         msvcrt_tm_to_unix( &tm, mstm );
 609         if (!strftime( s, max*4, fmt, &tm )) s[0] = 0;
 610         len = MultiByteToWideChar( CP_UNIXCP, 0, s, -1, str, max );
 611         if (len) len--;
 612         MSVCRT_free( s );
 613     }
 614     else len = 0;
 615
 616     MSVCRT_free( fmt );
 617     return len;
 618 }
 619
 620 /*********************************************************************
 621  *              asctime (MSVCRT.@)
 622  */
 623 char * CDECL MSVCRT_asctime(const struct MSVCRT_tm *mstm)
 624 {
 625     thread_data_t *data = msvcrt_get_thread_data();
 626     struct tm tm;
 627
 628     msvcrt_tm_to_unix( &tm, mstm );
 629
 630     if (!data->asctime_buffer)
 631         data->asctime_buffer = MSVCRT_malloc( 30 ); /* ought to be enough */
 632
 633     /* FIXME: may want to map from Unix codepage to CP_ACP */
 634 #ifdef HAVE_ASCTIME_R
 635     asctime_r( &tm, data->asctime_buffer );
 636 #else
 637     strcpy( data->asctime_buffer, asctime(&tm) );
 638 #endif
 639     return data->asctime_buffer;
 640 }
 641
 642 /*********************************************************************
 643  *              _wasctime (MSVCRT.@)
 644  */
 645 MSVCRT_wchar_t * CDECL MSVCRT__wasctime(const struct MSVCRT_tm *mstm)
 646 {
 647     thread_data_t *data = msvcrt_get_thread_data();
 648     struct tm tm;
 649     char buffer[30];
 650
 651     msvcrt_tm_to_unix( &tm, mstm );
 652
 653     if (!data->wasctime_buffer)
 654         data->wasctime_buffer = MSVCRT_malloc( 30*sizeof(MSVCRT_wchar_t) ); /* ought to be enough */
 655 #ifdef HAVE_ASCTIME_R
 656     asctime_r( &tm, buffer );
 657 #else
 658     strcpy( buffer, asctime(&tm) );
 659 #endif
 660     MultiByteToWideChar( CP_UNIXCP, 0, buffer, -1, data->wasctime_buffer, 30 );
 661     return data->wasctime_buffer;
 662 }
 663
 664 /*********************************************************************
 665  *              _ctime64 (MSVCRT.@)
 666  */
 667 char * CDECL MSVCRT__ctime64(const MSVCRT___time64_t *time)
 668 {
 669     struct MSVCRT_tm *t;
 670     t = MSVCRT__localtime64( time );
 671     if (!t) return NULL;
 672     return MSVCRT_asctime( t );
 673 }
 674
 675 /*********************************************************************
 676  *              _ctime32 (MSVCRT.@)
 677  */
 678 char * CDECL MSVCRT__ctime32(const MSVCRT___time32_t *time)
 679 {
 680     struct MSVCRT_tm *t;
 681     t = MSVCRT__localtime32( time );
 682     if (!t) return NULL;
 683     return MSVCRT_asctime( t );
 684 }
 685
 686 /*********************************************************************
 687  *              ctime (MSVCRT.@)
 688  */
 689 #ifdef _WIN64
 690 char * CDECL MSVCRT_ctime(const MSVCRT___time64_t *time)
 691 {
 692     return MSVCRT__ctime64( time );
 693 }
 694 #else
 695 char * CDECL MSVCRT_ctime(const MSVCRT___time32_t *time)
 696 {
 697     return MSVCRT__ctime32( time );
 698 }
 699 #endif
 700
 701 /*********************************************************************
 702  *              _wctime64 (MSVCRT.@)
 703  */
 704 MSVCRT_wchar_t * CDECL MSVCRT__wctime64(const MSVCRT___time64_t *time)
 705 {
 706     return MSVCRT__wasctime( MSVCRT__localtime64(time) );
 707 }
 708
 709 /*********************************************************************
 710  *              _wctime32 (MSVCRT.@)
 711  */
 712 MSVCRT_wchar_t * CDECL MSVCRT__wctime32(const MSVCRT___time32_t *time)
 713 {
 714     return MSVCRT__wasctime( MSVCRT__localtime32(time) );
 715 }
 716
 717 /*********************************************************************
 718  *              _wctime (MSVCRT.@)
 719  */
 720 #ifdef _WIN64
 721 MSVCRT_wchar_t * CDECL MSVCRT__wctime(const MSVCRT___time64_t *time)
 722 {
 723     return MSVCRT__wctime64( time );
 724 }
 725 #else
 726 MSVCRT_wchar_t * CDECL MSVCRT__wctime(const MSVCRT___time32_t *time)
 727 {
 728     return MSVCRT__wctime32( time );
 729 }
 730 #endif