source/lib/time.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    time handling functions
   4    Copyright (C) Andrew Tridgell                1992-1998
   5    Copyright (C) Stefan (metze) Metzmacher      2002
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 /*
  24   This stuff was largely rewritten by Paul Eggert <eggert@twinsun.com>
  25   in May 1996
  26   */
  27
  28
  29 int extra_time_offset = 0;
  30
  31 #ifndef CHAR_BIT
  32 #define CHAR_BIT 8
  33 #endif
  34
  35 #ifndef TIME_T_MIN
  36 #define TIME_T_MIN ((time_t)0 < (time_t) -1 ? (time_t) 0 \
  37                     : ~ (time_t) 0 << (sizeof (time_t) * CHAR_BIT - 1))
  38 #endif
  39 #ifndef TIME_T_MAX
  40 #define TIME_T_MAX (~ (time_t) 0 - TIME_T_MIN)
  41 #endif
  42
  43 void get_nttime_max(NTTIME *t)
  44 {
  45         /* FIXME: This is incorrect */
  46         unix_to_nt_time(t, get_time_t_max());
  47 }
  48
  49 /*******************************************************************
  50  External access to time_t_min and time_t_max.
  51 ********************************************************************/
  52
  53 time_t get_time_t_max(void)
  54 {
  55         return TIME_T_MAX;
  56 }
  57
  58 /*******************************************************************
  59  A gettimeofday wrapper.
  60 ********************************************************************/
  61
  62 void GetTimeOfDay(struct timeval *tval)
  63 {
  64 #ifdef HAVE_GETTIMEOFDAY_TZ
  65         gettimeofday(tval,NULL);
  66 #else
  67         gettimeofday(tval);
  68 #endif
  69 }
  70
  71 #define TM_YEAR_BASE 1900
  72
  73 /*******************************************************************
  74  Yield the difference between *A and *B, in seconds, ignoring leap seconds.
  75 ********************************************************************/
  76
  77 static int tm_diff(struct tm *a, struct tm *b)
  78 {
  79         int ay = a->tm_year + (TM_YEAR_BASE - 1);
  80         int by = b->tm_year + (TM_YEAR_BASE - 1);
  81         int intervening_leap_days = (ay/4 - by/4) - (ay/100 - by/100) + (ay/400 - by/400);
  82         int years = ay - by;
  83         int days = 365*years + intervening_leap_days + (a->tm_yday - b->tm_yday);
  84         int hours = 24*days + (a->tm_hour - b->tm_hour);
  85         int minutes = 60*hours + (a->tm_min - b->tm_min);
  86         int seconds = 60*minutes + (a->tm_sec - b->tm_sec);
  87
  88         return seconds;
  89 }
  90
  91 /*******************************************************************
  92  Return the UTC offset in seconds west of UTC, or 0 if it cannot be determined.
  93 ******************************************************************/
  94
  95 static int TimeZone(time_t t)
  96 {
  97         struct tm *tm = gmtime(&t);
  98         struct tm tm_utc;
  99         if (!tm)
 100                 return 0;
 101         tm_utc = *tm;
 102         tm = localtime(&t);
 103         if (!tm)
 104                 return 0;
 105         return tm_diff(&tm_utc,tm);
 106 }
 107
 108 static BOOL done_serverzone_init;
 109
 110 /*******************************************************************
 111  Return the smb serverzone value.
 112 ******************************************************************/
 113
 114 static int get_serverzone(void)
 115 {
 116         static int serverzone;
 117
 118         if (!done_serverzone_init) {
 119                 serverzone = TimeZone(time(NULL));
 120
 121                 if ((serverzone % 60) != 0) {
 122                         DEBUG(1,("WARNING: Your timezone is not a multiple of 1 minute.\n"));
 123                 }
 124
 125                 DEBUG(4,("Serverzone is %d\n",serverzone));
 126
 127                 done_serverzone_init = True;
 128         }
 129
 130         return serverzone;
 131 }
 132
 133 /*******************************************************************
 134  Re-read the smb serverzone value.
 135 ******************************************************************/
 136
 137 static struct timeval start_time_hires;
 138
 139 void TimeInit(void)
 140 {
 141         done_serverzone_init = False;
 142         get_serverzone();
 143         /* Save the start time of this process. */
 144         if (start_time_hires.tv_sec == 0 && start_time_hires.tv_usec == 0)
 145                 GetTimeOfDay(&start_time_hires);
 146 }
 147
 148 /**********************************************************************
 149  Return a timeval struct of the uptime of this process. As TimeInit is
 150  done before a daemon fork then this is the start time from the parent
 151  daemon start. JRA.
 152 ***********************************************************************/
 153
 154 void get_process_uptime(struct timeval *ret_time)
 155 {
 156         struct timeval time_now_hires;
 157
 158         GetTimeOfDay(&time_now_hires);
 159         ret_time->tv_sec = time_now_hires.tv_sec - start_time_hires.tv_sec;
 160         ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
 161         if (time_now_hires.tv_usec < start_time_hires.tv_usec) {
 162                 ret_time->tv_sec -= 1;
 163                 ret_time->tv_usec = 1000000 + (time_now_hires.tv_usec - start_time_hires.tv_usec);
 164         } else
 165                 ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
 166 }
 167
 168 /*******************************************************************
 169  Return the same value as TimeZone, but it should be more efficient.
 170
 171  We keep a table of DST offsets to prevent calling localtime() on each
 172  call of this function. This saves a LOT of time on many unixes.
 173
 174  Updated by Paul Eggert <eggert@twinsun.com>
 175 ********************************************************************/
 176
 177 static int TimeZoneFaster(time_t t)
 178 {
 179         static struct dst_table {time_t start,end; int zone;} *tdt, *dst_table = NULL;
 180         static int table_size = 0;
 181         int i;
 182         int zone = 0;
 183
 184         if (t == 0)
 185                 t = time(NULL);
 186
 187         /* Tunis has a 8 day DST region, we need to be careful ... */
 188 #define MAX_DST_WIDTH (365*24*60*60)
 189 #define MAX_DST_SKIP (7*24*60*60)
 190
 191         for (i=0;i<table_size;i++)
 192                 if (t >= dst_table[i].start && t <= dst_table[i].end)
 193                         break;
 194
 195         if (i<table_size) {
 196                 zone = dst_table[i].zone;
 197         } else {
 198                 time_t low,high;
 199
 200                 zone = TimeZone(t);
 201                 tdt = SMB_REALLOC_ARRAY(dst_table, struct dst_table, i+1);
 202                 if (!tdt) {
 203                         DEBUG(0,("TimeZoneFaster: out of memory!\n"));
 204                         SAFE_FREE(dst_table);
 205                         table_size = 0;
 206                 } else {
 207                         dst_table = tdt;
 208                         table_size++;
 209
 210                         dst_table[i].zone = zone;
 211                         dst_table[i].start = dst_table[i].end = t;
 212
 213                         /* no entry will cover more than 6 months */
 214                         low = t - MAX_DST_WIDTH/2;
 215                         if (t < low)
 216                                 low = TIME_T_MIN;
 217
 218                         high = t + MAX_DST_WIDTH/2;
 219                         if (high < t)
 220                                 high = TIME_T_MAX;
 221
 222                         /* widen the new entry using two bisection searches */
 223                         while (low+60*60 < dst_table[i].start) {
 224                                 if (dst_table[i].start - low > MAX_DST_SKIP*2)
 225                                         t = dst_table[i].start - MAX_DST_SKIP;
 226                                 else
 227                                         t = low + (dst_table[i].start-low)/2;
 228                                 if (TimeZone(t) == zone)
 229                                         dst_table[i].start = t;
 230                                 else
 231                                         low = t;
 232                         }
 233
 234                         while (high-60*60 > dst_table[i].end) {
 235                                 if (high - dst_table[i].end > MAX_DST_SKIP*2)
 236                                         t = dst_table[i].end + MAX_DST_SKIP;
 237                                 else
 238                                         t = high - (high-dst_table[i].end)/2;
 239                                 if (TimeZone(t) == zone)
 240                                         dst_table[i].end = t;
 241                                 else
 242                                         high = t;
 243                         }
 244 #if 0
 245       DEBUG(1,("Added DST entry from %s ",
 246                asctime(localtime(&dst_table[i].start))));
 247       DEBUG(1,("to %s (%d)\n",asctime(localtime(&dst_table[i].end)),
 248                dst_table[i].zone));
 249 #endif
 250                 }
 251         }
 252         return zone;
 253 }
 254
 255 /****************************************************************************
 256  Return the UTC offset in seconds west of UTC, adjusted for extra time offset.
 257 **************************************************************************/
 258
 259 int TimeDiff(time_t t)
 260 {
 261         return TimeZoneFaster(t) + 60*extra_time_offset;
 262 }
 263
 264 /****************************************************************************
 265  Return the UTC offset in seconds west of UTC, adjusted for extra time
 266  offset, for a local time value.  If ut = lt + LocTimeDiff(lt), then
 267  lt = ut - TimeDiff(ut), but the converse does not necessarily hold near
 268  daylight savings transitions because some local times are ambiguous.
 269  LocTimeDiff(t) equals TimeDiff(t) except near daylight savings transitions.
 270 **************************************************************************/
 271
 272 static int LocTimeDiff(time_t lte)
 273 {
 274         time_t lt = lte - 60*extra_time_offset;
 275         int d = TimeZoneFaster(lt);
 276         time_t t = lt + d;
 277
 278         /* if overflow occurred, ignore all the adjustments so far */
 279         if (((lte < lt) ^ (extra_time_offset < 0))  |  ((t < lt) ^ (d < 0)))
 280                 t = lte;
 281
 282         /* now t should be close enough to the true UTC to yield the right answer */
 283         return TimeDiff(t);
 284 }
 285
 286 /****************************************************************************
 287  Try to optimise the localtime call, it can be quite expensive on some machines.
 288 ****************************************************************************/
 289
 290 struct tm *LocalTime(time_t *t)
 291 {
 292         time_t t2 = *t;
 293
 294         t2 -= TimeDiff(t2);
 295
 296         return(gmtime(&t2));
 297 }
 298
 299 #define TIME_FIXUP_CONSTANT (369.0*365.25*24*60*60-(3.0*24*60*60+6.0*60*60))
 300
 301 /****************************************************************************
 302  Interpret an 8 byte "filetime" structure to a time_t
 303  It's originally in "100ns units since jan 1st 1601"
 304
 305  An 8 byte value of 0xffffffffffffffff will be returned as (time_t)0.
 306
 307  It appears to be kludge-GMT (at least for file listings). This means
 308  its the GMT you get by taking a localtime and adding the
 309  serverzone. This is NOT the same as GMT in some cases. This routine
 310  converts this to real GMT.
 311 ****************************************************************************/
 312
 313 time_t nt_time_to_unix(NTTIME *nt)
 314 {
 315         double d;
 316         time_t ret;
 317         /* The next two lines are a fix needed for the
 318                 broken SCO compiler. JRA. */
 319         time_t l_time_min = TIME_T_MIN;
 320         time_t l_time_max = TIME_T_MAX;
 321
 322         if (nt->high == 0 || (nt->high == 0xffffffff && nt->low == 0xffffffff))
 323                 return(0);
 324
 325         d = ((double)nt->high)*4.0*(double)(1<<30);
 326         d += (nt->low&0xFFF00000);
 327         d *= 1.0e-7;
 328
 329         /* now adjust by 369 years to make the secs since 1970 */
 330         d -= TIME_FIXUP_CONSTANT;
 331
 332         if (d <= l_time_min)
 333                 return (l_time_min);
 334
 335         if (d >= l_time_max)
 336                 return (l_time_max);
 337
 338         ret = (time_t)(d+0.5);
 339
 340         /* this takes us from kludge-GMT to real GMT */
 341         ret -= get_serverzone();
 342         ret += LocTimeDiff(ret);
 343
 344         return(ret);
 345 }
 346
 347 /****************************************************************************
 348  Convert a NTTIME structure to a time_t.
 349  It's originally in "100ns units".
 350
 351  This is an absolute version of the one above.
 352  By absolute I mean, it doesn't adjust from 1/1/1601 to 1/1/1970
 353  if the NTTIME was 5 seconds, the time_t is 5 seconds. JFM
 354 ****************************************************************************/
 355
 356 time_t nt_time_to_unix_abs(NTTIME *nt)
 357 {
 358         double d;
 359         time_t ret;
 360         /* The next two lines are a fix needed for the
 361            broken SCO compiler. JRA. */
 362         time_t l_time_min = TIME_T_MIN;
 363         time_t l_time_max = TIME_T_MAX;
 364
 365         if (nt->high == 0)
 366                 return(0);
 367
 368         if (nt->high==0x80000000 && nt->low==0)
 369                 return -1;
 370
 371         /* reverse the time */
 372         /* it's a negative value, turn it to positive */
 373         nt->high=~nt->high;
 374         nt->low=~nt->low;
 375
 376         d = ((double)nt->high)*4.0*(double)(1<<30);
 377         d += (nt->low&0xFFF00000);
 378         d *= 1.0e-7;
 379
 380         if (!(l_time_min <= d && d <= l_time_max))
 381                 return(0);
 382
 383         ret = (time_t)(d+0.5);
 384
 385         return(ret);
 386 }
 387
 388 /****************************************************************************
 389  Interprets an nt time into a unix time_t.
 390  Differs from nt_time_to_unix in that an 8 byte value of 0xffffffffffffffff
 391  will be returned as (time_t)-1, whereas nt_time_to_unix returns 0 in this case.
 392 ****************************************************************************/
 393
 394 time_t interpret_long_date(char *p)
 395 {
 396         NTTIME nt;
 397         nt.low = IVAL(p,0);
 398         nt.high = IVAL(p,4);
 399         if (nt.low == 0xFFFFFFFF && nt.high == 0xFFFFFFFF) {
 400                 return (time_t)-1;
 401         }
 402         return nt_time_to_unix(&nt);
 403 }
 404
 405 /****************************************************************************
 406  Put a 8 byte filetime from a time_t
 407  This takes real GMT as input and converts to kludge-GMT
 408 ****************************************************************************/
 409
 410 void unix_to_nt_time(NTTIME *nt, time_t t)
 411 {
 412         double d;
 413
 414         if (t==0) {
 415                 nt->low = 0;
 416                 nt->high = 0;
 417                 return;
 418         }
 419         if (t == TIME_T_MAX) {
 420                 nt->low = 0xffffffff;
 421                 nt->high = 0x7fffffff;
 422                 return;
 423         }
 424         if (t == -1) {
 425                 nt->low = 0xffffffff;
 426                 nt->high = 0xffffffff;
 427                 return;
 428         }
 429
 430         /* this converts GMT to kludge-GMT */
 431         t -= TimeDiff(t) - get_serverzone();
 432
 433         d = (double)(t);
 434         d += TIME_FIXUP_CONSTANT;
 435         d *= 1.0e7;
 436
 437         nt->high = (uint32)(d * (1.0/(4.0*(double)(1<<30))));
 438         nt->low  = (uint32)(d - ((double)nt->high)*4.0*(double)(1<<30));
 439 }
 440
 441 /****************************************************************************
 442  Convert a time_t to a NTTIME structure
 443
 444  This is an absolute version of the one above.
 445  By absolute I mean, it doesn't adjust from 1/1/1970 to 1/1/1601
 446  If the nttime_t was 5 seconds, the NTTIME is 5 seconds. JFM
 447 ****************************************************************************/
 448
 449 void unix_to_nt_time_abs(NTTIME *nt, time_t t)
 450 {
 451         double d;
 452
 453         if (t==0) {
 454                 nt->low = 0;
 455                 nt->high = 0;
 456                 return;
 457         }
 458
 459         if (t == TIME_T_MAX) {
 460                 nt->low = 0xffffffff;
 461                 nt->high = 0x7fffffff;
 462                 return;
 463         }
 464
 465         if (t == -1) {
 466                 /* that's what NT uses for infinite */
 467                 nt->low = 0x0;
 468                 nt->high = 0x80000000;
 469                 return;
 470         }
 471
 472         d = (double)(t);
 473         d *= 1.0e7;
 474
 475         nt->high = (uint32)(d * (1.0/(4.0*(double)(1<<30))));
 476         nt->low  = (uint32)(d - ((double)nt->high)*4.0*(double)(1<<30));
 477
 478         /* convert to a negative value */
 479         nt->high=~nt->high;
 480         nt->low=~nt->low;
 481 }
 482
 483 /****************************************************************************
 484  Take a Unix time and convert to an NTTIME structure and place in buffer
 485  pointed to by p.
 486 ****************************************************************************/
 487
 488 void put_long_date(char *p,time_t t)
 489 {
 490         NTTIME nt;
 491         unix_to_nt_time(&nt, t);
 492         SIVAL(p, 0, nt.low);
 493         SIVAL(p, 4, nt.high);
 494 }
 495
 496 /****************************************************************************
 497  Check if it's a null mtime.
 498 ****************************************************************************/
 499
 500 BOOL null_mtime(time_t mtime)
 501 {
 502         if (mtime == 0 || mtime == (time_t)0xFFFFFFFF || mtime == (time_t)-1)
 503                 return(True);
 504         return(False);
 505 }
 506
 507 /*******************************************************************
 508  Create a 16 bit dos packed date.
 509 ********************************************************************/
 510
 511 static uint16 make_dos_date1(struct tm *t)
 512 {
 513         uint16 ret=0;
 514         ret = (((unsigned)(t->tm_mon+1)) >> 3) | ((t->tm_year-80) << 1);
 515         ret = ((ret&0xFF)<<8) | (t->tm_mday | (((t->tm_mon+1) & 0x7) << 5));
 516         return(ret);
 517 }
 518
 519 /*******************************************************************
 520  Create a 16 bit dos packed time.
 521 ********************************************************************/
 522
 523 static uint16 make_dos_time1(struct tm *t)
 524 {
 525         uint16 ret=0;
 526         ret = ((((unsigned)t->tm_min >> 3)&0x7) | (((unsigned)t->tm_hour) << 3));
 527         ret = ((ret&0xFF)<<8) | ((t->tm_sec/2) | ((t->tm_min & 0x7) << 5));
 528         return(ret);
 529 }
 530
 531 /*******************************************************************
 532  Create a 32 bit dos packed date/time from some parameters.
 533  This takes a GMT time and returns a packed localtime structure.
 534 ********************************************************************/
 535
 536 static uint32 make_dos_date(time_t unixdate)
 537 {
 538         struct tm *t;
 539         uint32 ret=0;
 540
 541         t = LocalTime(&unixdate);
 542         if (!t)
 543                 return 0xFFFFFFFF;
 544
 545         ret = make_dos_date1(t);
 546         ret = ((ret&0xFFFF)<<16) | make_dos_time1(t);
 547
 548         return(ret);
 549 }
 550
 551 /*******************************************************************
 552  Put a dos date into a buffer (time/date format).
 553  This takes GMT time and puts local time in the buffer.
 554 ********************************************************************/
 555
 556 void put_dos_date(char *buf,int offset,time_t unixdate)
 557 {
 558         uint32 x = make_dos_date(unixdate);
 559         SIVAL(buf,offset,x);
 560 }
 561
 562 /*******************************************************************
 563  Put a dos date into a buffer (date/time format).
 564  This takes GMT time and puts local time in the buffer.
 565 ********************************************************************/
 566
 567 void put_dos_date2(char *buf,int offset,time_t unixdate)
 568 {
 569         uint32 x = make_dos_date(unixdate);
 570         x = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
 571         SIVAL(buf,offset,x);
 572 }
 573
 574 /*******************************************************************
 575  Put a dos 32 bit "unix like" date into a buffer. This routine takes
 576  GMT and converts it to LOCAL time before putting it (most SMBs assume
 577  localtime for this sort of date)
 578 ********************************************************************/
 579
 580 void put_dos_date3(char *buf,int offset,time_t unixdate)
 581 {
 582         if (!null_mtime(unixdate))
 583                 unixdate -= TimeDiff(unixdate);
 584         SIVAL(buf,offset,unixdate);
 585 }
 586
 587 /*******************************************************************
 588  Interpret a 32 bit dos packed date/time to some parameters.
 589 ********************************************************************/
 590
 591 static void interpret_dos_date(uint32 date,int *year,int *month,int *day,int *hour,int *minute,int *second)
 592 {
 593         uint32 p0,p1,p2,p3;
 594
 595         p0=date&0xFF; p1=((date&0xFF00)>>8)&0xFF;
 596         p2=((date&0xFF0000)>>16)&0xFF; p3=((date&0xFF000000)>>24)&0xFF;
 597
 598         *second = 2*(p0 & 0x1F);
 599         *minute = ((p0>>5)&0xFF) + ((p1&0x7)<<3);
 600         *hour = (p1>>3)&0xFF;
 601         *day = (p2&0x1F);
 602         *month = ((p2>>5)&0xFF) + ((p3&0x1)<<3) - 1;
 603         *year = ((p3>>1)&0xFF) + 80;
 604 }
 605
 606 /*******************************************************************
 607  Create a unix date (int GMT) from a dos date (which is actually in
 608  localtime).
 609 ********************************************************************/
 610
 611 time_t make_unix_date(void *date_ptr)
 612 {
 613         uint32 dos_date=0;
 614         struct tm t;
 615         time_t ret;
 616
 617         dos_date = IVAL(date_ptr,0);
 618
 619         if (dos_date == 0)
 620                 return(0);
 621
 622         interpret_dos_date(dos_date,&t.tm_year,&t.tm_mon,
 623                         &t.tm_mday,&t.tm_hour,&t.tm_min,&t.tm_sec);
 624         t.tm_isdst = -1;
 625
 626         /* mktime() also does the local to GMT time conversion for us */
 627         ret = mktime(&t);
 628
 629         return(ret);
 630 }
 631
 632 /*******************************************************************
 633  Like make_unix_date() but the words are reversed.
 634 ********************************************************************/
 635
 636 time_t make_unix_date2(void *date_ptr)
 637 {
 638         uint32 x,x2;
 639
 640         x = IVAL(date_ptr,0);
 641         x2 = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
 642         SIVAL(&x,0,x2);
 643
 644         return(make_unix_date((void *)&x));
 645 }
 646
 647 /*******************************************************************
 648  Create a unix GMT date from a dos date in 32 bit "unix like" format
 649  these generally arrive as localtimes, with corresponding DST.
 650 ******************************************************************/
 651
 652 time_t make_unix_date3(void *date_ptr)
 653 {
 654         time_t t = (time_t)IVAL(date_ptr,0);
 655         if (!null_mtime(t))
 656                 t += LocTimeDiff(t);
 657         return(t);
 658 }
 659
 660 /***************************************************************************
 661  Return a HTTP/1.0 time string.
 662 ***************************************************************************/
 663
 664 char *http_timestring(time_t t)
 665 {
 666         static fstring buf;
 667         struct tm *tm = LocalTime(&t);
 668
 669         if (!tm)
 670                 slprintf(buf,sizeof(buf)-1,"%ld seconds since the Epoch",(long)t);
 671         else
 672 #ifndef HAVE_STRFTIME
 673                 fstrcpy(buf, asctime(tm));
 674         if(buf[strlen(buf)-1] == '\n')
 675                 buf[strlen(buf)-1] = 0;
 676 #else /* !HAVE_STRFTIME */
 677                 strftime(buf, sizeof(buf)-1, "%a, %d %b %Y %H:%M:%S %Z", tm);
 678 #endif /* !HAVE_STRFTIME */
 679         return buf;
 680 }
 681
 682 /****************************************************************************
 683  Return the date and time as a string
 684 ****************************************************************************/
 685
 686 char *timestring(BOOL hires)
 687 {
 688         static fstring TimeBuf;
 689         struct timeval tp;
 690         time_t t;
 691         struct tm *tm;
 692
 693         if (hires) {
 694                 GetTimeOfDay(&tp);
 695                 t = (time_t)tp.tv_sec;
 696         } else {
 697                 t = time(NULL);
 698         }
 699         tm = LocalTime(&t);
 700         if (!tm) {
 701                 if (hires) {
 702                         slprintf(TimeBuf,
 703                                  sizeof(TimeBuf)-1,
 704                                  "%ld.%06ld seconds since the Epoch",
 705                                  (long)tp.tv_sec,
 706                                  (long)tp.tv_usec);
 707                 } else {
 708                         slprintf(TimeBuf,
 709                                  sizeof(TimeBuf)-1,
 710                                  "%ld seconds since the Epoch",
 711                                  (long)t);
 712                 }
 713         } else {
 714 #ifdef HAVE_STRFTIME
 715                 if (hires) {
 716                         strftime(TimeBuf,sizeof(TimeBuf)-1,"%Y/%m/%d %H:%M:%S",tm);
 717                         slprintf(TimeBuf+strlen(TimeBuf),
 718                                  sizeof(TimeBuf)-1 - strlen(TimeBuf),
 719                                  ".%06ld",
 720                                  (long)tp.tv_usec);
 721                 } else {
 722                         strftime(TimeBuf,sizeof(TimeBuf)-1,"%Y/%m/%d %H:%M:%S",tm);
 723                 }
 724 #else
 725                 if (hires) {
 726                         slprintf(TimeBuf,
 727                                  sizeof(TimeBuf)-1,
 728                                  "%s.%06ld",
 729                                  asctime(tm),
 730                                  (long)tp.tv_usec);
 731                 } else {
 732                         fstrcpy(TimeBuf, asctime(tm));
 733                 }
 734 #endif
 735         }
 736         return(TimeBuf);
 737 }
 738
 739 /****************************************************************************
 740  Return the best approximation to a 'create time' under UNIX from a stat
 741  structure.
 742 ****************************************************************************/
 743
 744 time_t get_create_time(SMB_STRUCT_STAT *st,BOOL fake_dirs)
 745 {
 746         time_t ret, ret1;
 747
 748         if(S_ISDIR(st->st_mode) && fake_dirs)
 749                 return (time_t)315493200L;          /* 1/1/1980 */
 750
 751         ret = MIN(st->st_ctime, st->st_mtime);
 752         ret1 = MIN(ret, st->st_atime);
 753
 754         if(ret1 != (time_t)0)
 755                 return ret1;
 756
 757         /*
 758          * One of ctime, mtime or atime was zero (probably atime).
 759          * Just return MIN(ctime, mtime).
 760          */
 761         return ret;
 762 }
 763
 764 /****************************************************************************
 765  Initialise an NTTIME to -1, which means "unknown" or "don't expire".
 766 ****************************************************************************/
 767
 768 void init_nt_time(NTTIME *nt)
 769 {
 770         nt->high = 0x7FFFFFFF;
 771         nt->low = 0xFFFFFFFF;
 772 }
 773
 774 /****************************************************************************
 775  Check if NTTIME is 0.
 776 ****************************************************************************/
 777
 778 BOOL nt_time_is_zero(NTTIME *nt)
 779 {
 780         if(nt->high==0)
 781                 return True;
 782         return False;
 783 }
 784
 785 /****************************************************************************
 786  Return a timeval difference in usec.
 787 ****************************************************************************/
 788
 789 SMB_BIG_INT usec_time_diff(struct timeval *larget, struct timeval *smallt)
 790 {
 791         SMB_BIG_INT sec_diff = larget->tv_sec - smallt->tv_sec;
 792         return (sec_diff * 1000000) + (SMB_BIG_INT)(larget->tv_usec - smallt->tv_usec);
 793 }