source3/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 void GetTimeOfDay(struct timeval *tval)
  62 {
  63 #ifdef HAVE_GETTIMEOFDAY_TZ
  64         gettimeofday(tval,NULL);
  65 #else
  66         gettimeofday(tval);
  67 #endif
  68 }
  69
  70 #define TM_YEAR_BASE 1900
  71
  72 /*******************************************************************
  73 yield the difference between *A and *B, in seconds, ignoring leap seconds
  74 ********************************************************************/
  75 static int tm_diff(struct tm *a, struct tm *b)
  76 {
  77   int ay = a->tm_year + (TM_YEAR_BASE - 1);
  78   int by = b->tm_year + (TM_YEAR_BASE - 1);
  79   int intervening_leap_days =
  80     (ay/4 - by/4) - (ay/100 - by/100) + (ay/400 - by/400);
  81   int years = ay - by;
  82   int days = 365*years + intervening_leap_days + (a->tm_yday - b->tm_yday);
  83   int hours = 24*days + (a->tm_hour - b->tm_hour);
  84   int minutes = 60*hours + (a->tm_min - b->tm_min);
  85   int seconds = 60*minutes + (a->tm_sec - b->tm_sec);
  86
  87   return seconds;
  88 }
  89
  90 /*******************************************************************
  91   return the UTC offset in seconds west of UTC, or 0 if it cannot be determined
  92   ******************************************************************/
  93 static int TimeZone(time_t t)
  94 {
  95   struct tm *tm = gmtime(&t);
  96   struct tm tm_utc;
  97   if (!tm)
  98     return 0;
  99   tm_utc = *tm;
 100   tm = localtime(&t);
 101   if (!tm)
 102     return 0;
 103   return tm_diff(&tm_utc,tm);
 104
 105 }
 106
 107 static BOOL done_serverzone_init;
 108
 109 /* Return the smb serverzone value */
 110
 111 static int get_serverzone(void)
 112 {
 113         static int serverzone;
 114
 115         if (!done_serverzone_init) {
 116                 serverzone = TimeZone(time(NULL));
 117
 118                 if ((serverzone % 60) != 0) {
 119                         DEBUG(1,("WARNING: Your timezone is not a multiple of 1 minute.\n"));
 120                 }
 121
 122                 DEBUG(4,("Serverzone is %d\n",serverzone));
 123
 124                 done_serverzone_init = True;
 125         }
 126
 127         return serverzone;
 128 }
 129
 130 /* Re-read the smb serverzone value */
 131
 132 static struct timeval start_time_hires;
 133
 134 void TimeInit(void)
 135 {
 136         done_serverzone_init = False;
 137         get_serverzone();
 138         /* Save the start time of this process. */
 139         if (start_time_hires.tv_sec == 0 && start_time_hires.tv_usec == 0)
 140                 GetTimeOfDay(&start_time_hires);
 141 }
 142
 143 /**********************************************************************
 144  Return a timeval struct of the uptime of this process. As TimeInit is
 145  done before a daemon fork then this is the start time from the parent
 146  daemon start. JRA.
 147 ***********************************************************************/
 148
 149 void get_process_uptime(struct timeval *ret_time)
 150 {
 151         struct timeval time_now_hires;
 152
 153         GetTimeOfDay(&time_now_hires);
 154         ret_time->tv_sec = time_now_hires.tv_sec - start_time_hires.tv_sec;
 155         ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
 156         if (time_now_hires.tv_usec < start_time_hires.tv_usec) {
 157                 ret_time->tv_sec -= 1;
 158                 ret_time->tv_usec = 1000000 + (time_now_hires.tv_usec - start_time_hires.tv_usec);
 159         } else
 160                 ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
 161 }
 162
 163 /*******************************************************************
 164 return the same value as TimeZone, but it should be more efficient.
 165
 166 We keep a table of DST offsets to prevent calling localtime() on each
 167 call of this function. This saves a LOT of time on many unixes.
 168
 169 Updated by Paul Eggert <eggert@twinsun.com>
 170 ********************************************************************/
 171 static int TimeZoneFaster(time_t t)
 172 {
 173   static struct dst_table {time_t start,end; int zone;} *tdt, *dst_table = NULL;
 174   static int table_size = 0;
 175   int i;
 176   int zone = 0;
 177
 178   if (t == 0) t = time(NULL);
 179
 180   /* Tunis has a 8 day DST region, we need to be careful ... */
 181 #define MAX_DST_WIDTH (365*24*60*60)
 182 #define MAX_DST_SKIP (7*24*60*60)
 183
 184   for (i=0;i<table_size;i++)
 185     if (t >= dst_table[i].start && t <= dst_table[i].end) break;
 186
 187   if (i<table_size) {
 188     zone = dst_table[i].zone;
 189   } else {
 190     time_t low,high;
 191
 192     zone = TimeZone(t);
 193     tdt = (struct dst_table *)Realloc(dst_table,
 194                                               sizeof(dst_table[0])*(i+1));
 195     if (!tdt) {
 196       DEBUG(0,("TimeZoneFaster: out of memory!\n"));
 197       SAFE_FREE(dst_table);
 198       table_size = 0;
 199     } else {
 200       dst_table = tdt;
 201       table_size++;
 202
 203       dst_table[i].zone = zone;
 204       dst_table[i].start = dst_table[i].end = t;
 205
 206       /* no entry will cover more than 6 months */
 207       low = t - MAX_DST_WIDTH/2;
 208       if (t < low)
 209         low = TIME_T_MIN;
 210
 211       high = t + MAX_DST_WIDTH/2;
 212       if (high < t)
 213         high = TIME_T_MAX;
 214
 215       /* widen the new entry using two bisection searches */
 216       while (low+60*60 < dst_table[i].start) {
 217         if (dst_table[i].start - low > MAX_DST_SKIP*2)
 218           t = dst_table[i].start - MAX_DST_SKIP;
 219         else
 220           t = low + (dst_table[i].start-low)/2;
 221         if (TimeZone(t) == zone)
 222           dst_table[i].start = t;
 223         else
 224           low = t;
 225       }
 226
 227       while (high-60*60 > dst_table[i].end) {
 228         if (high - dst_table[i].end > MAX_DST_SKIP*2)
 229           t = dst_table[i].end + MAX_DST_SKIP;
 230         else
 231           t = high - (high-dst_table[i].end)/2;
 232         if (TimeZone(t) == zone)
 233           dst_table[i].end = t;
 234         else
 235           high = t;
 236       }
 237 #if 0
 238       DEBUG(1,("Added DST entry from %s ",
 239                asctime(localtime(&dst_table[i].start))));
 240       DEBUG(1,("to %s (%d)\n",asctime(localtime(&dst_table[i].end)),
 241                dst_table[i].zone));
 242 #endif
 243     }
 244   }
 245   return zone;
 246 }
 247
 248 /****************************************************************************
 249   return the UTC offset in seconds west of UTC, adjusted for extra time offset
 250   **************************************************************************/
 251 int TimeDiff(time_t t)
 252 {
 253   return TimeZoneFaster(t) + 60*extra_time_offset;
 254 }
 255
 256
 257 /****************************************************************************
 258   return the UTC offset in seconds west of UTC, adjusted for extra time
 259   offset, for a local time value.  If ut = lt + LocTimeDiff(lt), then
 260   lt = ut - TimeDiff(ut), but the converse does not necessarily hold near
 261   daylight savings transitions because some local times are ambiguous.
 262   LocTimeDiff(t) equals TimeDiff(t) except near daylight savings transitions.
 263   +**************************************************************************/
 264 static int LocTimeDiff(time_t lte)
 265 {
 266   time_t lt = lte - 60*extra_time_offset;
 267   int d = TimeZoneFaster(lt);
 268   time_t t = lt + d;
 269
 270   /* if overflow occurred, ignore all the adjustments so far */
 271   if (((lte < lt) ^ (extra_time_offset < 0))  |  ((t < lt) ^ (d < 0)))
 272     t = lte;
 273
 274   /* now t should be close enough to the true UTC to yield the right answer */
 275   return TimeDiff(t);
 276 }
 277
 278
 279 /****************************************************************************
 280 try to optimise the localtime call, it can be quite expensive on some machines
 281 ****************************************************************************/
 282 struct tm *LocalTime(time_t *t)
 283 {
 284   time_t t2 = *t;
 285
 286   t2 -= TimeDiff(t2);
 287
 288   return(gmtime(&t2));
 289 }
 290
 291 #define TIME_FIXUP_CONSTANT (369.0*365.25*24*60*60-(3.0*24*60*60+6.0*60*60))
 292
 293 /****************************************************************************
 294 interpret an 8 byte "filetime" structure to a time_t
 295 It's originally in "100ns units since jan 1st 1601"
 296
 297 It appears to be kludge-GMT (at least for file listings). This means
 298 its the GMT you get by taking a localtime and adding the
 299 serverzone. This is NOT the same as GMT in some cases. This routine
 300 converts this to real GMT.
 301 ****************************************************************************/
 302 time_t nt_time_to_unix(NTTIME *nt)
 303 {
 304   double d;
 305   time_t ret;
 306   /* The next two lines are a fix needed for the
 307      broken SCO compiler. JRA. */
 308   time_t l_time_min = TIME_T_MIN;
 309   time_t l_time_max = TIME_T_MAX;
 310
 311   if (nt->high == 0 || (nt->high == 0xffffffff && nt->low == 0xffffffff))
 312           return(0);
 313
 314   d = ((double)nt->high)*4.0*(double)(1<<30);
 315   d += (nt->low&0xFFF00000);
 316   d *= 1.0e-7;
 317
 318   /* now adjust by 369 years to make the secs since 1970 */
 319   d -= TIME_FIXUP_CONSTANT;
 320
 321   if (d <= l_time_min)
 322           return (l_time_min);
 323
 324   if (d >= l_time_max)
 325           return (l_time_max);
 326
 327   ret = (time_t)(d+0.5);
 328
 329   /* this takes us from kludge-GMT to real GMT */
 330   ret -= get_serverzone();
 331   ret += LocTimeDiff(ret);
 332
 333   return(ret);
 334 }
 335
 336 /****************************************************************************
 337  Convert a NTTIME structure to a time_t.
 338  It's originally in "100ns units".
 339
 340  This is an absolute version of the one above.
 341  By absolute I mean, it doesn't adjust from 1/1/1601 to 1/1/1970
 342  if the NTTIME was 5 seconds, the time_t is 5 seconds. JFM
 343 ****************************************************************************/
 344
 345 time_t nt_time_to_unix_abs(NTTIME *nt)
 346 {
 347         double d;
 348         time_t ret;
 349         /* The next two lines are a fix needed for the
 350            broken SCO compiler. JRA. */
 351         time_t l_time_min = TIME_T_MIN;
 352         time_t l_time_max = TIME_T_MAX;
 353
 354         if (nt->high == 0)
 355                 return(0);
 356
 357         if (nt->high==0x80000000 && nt->low==0)
 358                 return -1;
 359
 360         /* reverse the time */
 361         /* it's a negative value, turn it to positive */
 362         nt->high=~nt->high;
 363         nt->low=~nt->low;
 364
 365         d = ((double)nt->high)*4.0*(double)(1<<30);
 366         d += (nt->low&0xFFF00000);
 367         d *= 1.0e-7;
 368
 369         if (!(l_time_min <= d && d <= l_time_max))
 370                 return(0);
 371
 372         ret = (time_t)(d+0.5);
 373
 374         return(ret);
 375 }
 376
 377 /****************************************************************************
 378 interprets an nt time into a unix time_t
 379 ****************************************************************************/
 380 time_t interpret_long_date(char *p)
 381 {
 382         NTTIME nt;
 383         nt.low = IVAL(p,0);
 384         nt.high = IVAL(p,4);
 385         return nt_time_to_unix(&nt);
 386 }
 387
 388 /****************************************************************************
 389 put a 8 byte filetime from a time_t
 390 This takes real GMT as input and converts to kludge-GMT
 391 ****************************************************************************/
 392 void unix_to_nt_time(NTTIME *nt, time_t t)
 393 {
 394         double d;
 395
 396         if (t==0)
 397         {
 398                 nt->low = 0;
 399                 nt->high = 0;
 400                 return;
 401         }
 402         if (t == TIME_T_MAX)
 403         {
 404                 nt->low = 0xffffffff;
 405                 nt->high = 0x7fffffff;
 406                 return;
 407         }
 408         if (t == -1)
 409         {
 410                 nt->low = 0xffffffff;
 411                 nt->high = 0xffffffff;
 412                 return;
 413         }
 414
 415         /* this converts GMT to kludge-GMT */
 416         t -= TimeDiff(t) - get_serverzone();
 417
 418         d = (double)(t);
 419         d += TIME_FIXUP_CONSTANT;
 420         d *= 1.0e7;
 421
 422         nt->high = (uint32)(d * (1.0/(4.0*(double)(1<<30))));
 423         nt->low  = (uint32)(d - ((double)nt->high)*4.0*(double)(1<<30));
 424 }
 425
 426 /****************************************************************************
 427  Convert a time_t to a NTTIME structure
 428
 429  This is an absolute version of the one above.
 430  By absolute I mean, it doesn't adjust from 1/1/1970 to 1/1/1601
 431  If the nttime_t was 5 seconds, the NTTIME is 5 seconds. JFM
 432 ****************************************************************************/
 433
 434 void unix_to_nt_time_abs(NTTIME *nt, time_t t)
 435 {
 436         double d;
 437
 438         if (t==0) {
 439                 nt->low = 0;
 440                 nt->high = 0;
 441                 return;
 442         }
 443
 444         if (t == TIME_T_MAX) {
 445                 nt->low = 0xffffffff;
 446                 nt->high = 0x7fffffff;
 447                 return;
 448         }
 449
 450         if (t == -1) {
 451                 /* that's what NT uses for infinite */
 452                 nt->low = 0x0;
 453                 nt->high = 0x80000000;
 454                 return;
 455         }
 456
 457         d = (double)(t);
 458         d *= 1.0e7;
 459
 460         nt->high = (uint32)(d * (1.0/(4.0*(double)(1<<30))));
 461         nt->low  = (uint32)(d - ((double)nt->high)*4.0*(double)(1<<30));
 462
 463         /* convert to a negative value */
 464         nt->high=~nt->high;
 465         nt->low=~nt->low;
 466 }
 467
 468
 469 /****************************************************************************
 470 take an NTTIME structure, containing high / low time.  convert to unix time.
 471 lkclXXXX this may need 2 SIVALs not a memcpy.  we'll see...
 472 ****************************************************************************/
 473 void put_long_date(char *p,time_t t)
 474 {
 475         NTTIME nt;
 476         unix_to_nt_time(&nt, t);
 477         SIVAL(p, 0, nt.low);
 478         SIVAL(p, 4, nt.high);
 479 }
 480
 481 /****************************************************************************
 482 check if it's a null mtime
 483 ****************************************************************************/
 484 BOOL null_mtime(time_t mtime)
 485 {
 486   if (mtime == 0 || mtime == (time_t)0xFFFFFFFF || mtime == (time_t)-1)
 487     return(True);
 488   return(False);
 489 }
 490
 491 /*******************************************************************
 492   create a 16 bit dos packed date
 493 ********************************************************************/
 494 static uint16 make_dos_date1(struct tm *t)
 495 {
 496   uint16 ret=0;
 497   ret = (((unsigned)(t->tm_mon+1)) >> 3) | ((t->tm_year-80) << 1);
 498   ret = ((ret&0xFF)<<8) | (t->tm_mday | (((t->tm_mon+1) & 0x7) << 5));
 499   return(ret);
 500 }
 501
 502 /*******************************************************************
 503   create a 16 bit dos packed time
 504 ********************************************************************/
 505 static uint16 make_dos_time1(struct tm *t)
 506 {
 507   uint16 ret=0;
 508   ret = ((((unsigned)t->tm_min >> 3)&0x7) | (((unsigned)t->tm_hour) << 3));
 509   ret = ((ret&0xFF)<<8) | ((t->tm_sec/2) | ((t->tm_min & 0x7) << 5));
 510   return(ret);
 511 }
 512
 513 /*******************************************************************
 514   create a 32 bit dos packed date/time from some parameters
 515   This takes a GMT time and returns a packed localtime structure
 516 ********************************************************************/
 517 static uint32 make_dos_date(time_t unixdate)
 518 {
 519   struct tm *t;
 520   uint32 ret=0;
 521
 522   t = LocalTime(&unixdate);
 523   if (!t)
 524     return 0xFFFFFFFF;
 525
 526   ret = make_dos_date1(t);
 527   ret = ((ret&0xFFFF)<<16) | make_dos_time1(t);
 528
 529   return(ret);
 530 }
 531
 532 /*******************************************************************
 533 put a dos date into a buffer (time/date format)
 534 This takes GMT time and puts local time in the buffer
 535 ********************************************************************/
 536 void put_dos_date(char *buf,int offset,time_t unixdate)
 537 {
 538   uint32 x = make_dos_date(unixdate);
 539   SIVAL(buf,offset,x);
 540 }
 541
 542 /*******************************************************************
 543 put a dos date into a buffer (date/time format)
 544 This takes GMT time and puts local time in the buffer
 545 ********************************************************************/
 546 void put_dos_date2(char *buf,int offset,time_t unixdate)
 547 {
 548   uint32 x = make_dos_date(unixdate);
 549   x = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
 550   SIVAL(buf,offset,x);
 551 }
 552
 553 /*******************************************************************
 554 put a dos 32 bit "unix like" date into a buffer. This routine takes
 555 GMT and converts it to LOCAL time before putting it (most SMBs assume
 556 localtime for this sort of date)
 557 ********************************************************************/
 558 void put_dos_date3(char *buf,int offset,time_t unixdate)
 559 {
 560   if (!null_mtime(unixdate))
 561     unixdate -= TimeDiff(unixdate);
 562   SIVAL(buf,offset,unixdate);
 563 }
 564
 565 /*******************************************************************
 566   interpret a 32 bit dos packed date/time to some parameters
 567 ********************************************************************/
 568 static void interpret_dos_date(uint32 date,int *year,int *month,int *day,int *hour,int *minute,int *second)
 569 {
 570   uint32 p0,p1,p2,p3;
 571
 572   p0=date&0xFF; p1=((date&0xFF00)>>8)&0xFF;
 573   p2=((date&0xFF0000)>>16)&0xFF; p3=((date&0xFF000000)>>24)&0xFF;
 574
 575   *second = 2*(p0 & 0x1F);
 576   *minute = ((p0>>5)&0xFF) + ((p1&0x7)<<3);
 577   *hour = (p1>>3)&0xFF;
 578   *day = (p2&0x1F);
 579   *month = ((p2>>5)&0xFF) + ((p3&0x1)<<3) - 1;
 580   *year = ((p3>>1)&0xFF) + 80;
 581 }
 582
 583 /*******************************************************************
 584   create a unix date (int GMT) from a dos date (which is actually in
 585   localtime)
 586 ********************************************************************/
 587 time_t make_unix_date(void *date_ptr)
 588 {
 589   uint32 dos_date=0;
 590   struct tm t;
 591   time_t ret;
 592
 593   dos_date = IVAL(date_ptr,0);
 594
 595   if (dos_date == 0) return(0);
 596
 597   interpret_dos_date(dos_date,&t.tm_year,&t.tm_mon,
 598                      &t.tm_mday,&t.tm_hour,&t.tm_min,&t.tm_sec);
 599   t.tm_isdst = -1;
 600
 601   /* mktime() also does the local to GMT time conversion for us */
 602   ret = mktime(&t);
 603
 604   return(ret);
 605 }
 606
 607 /*******************************************************************
 608 like make_unix_date() but the words are reversed
 609 ********************************************************************/
 610 time_t make_unix_date2(void *date_ptr)
 611 {
 612   uint32 x,x2;
 613
 614   x = IVAL(date_ptr,0);
 615   x2 = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
 616   SIVAL(&x,0,x2);
 617
 618   return(make_unix_date((void *)&x));
 619 }
 620
 621 /*******************************************************************
 622   create a unix GMT date from a dos date in 32 bit "unix like" format
 623   these generally arrive as localtimes, with corresponding DST
 624   ******************************************************************/
 625 time_t make_unix_date3(void *date_ptr)
 626 {
 627   time_t t = (time_t)IVAL(date_ptr,0);
 628   if (!null_mtime(t))
 629     t += LocTimeDiff(t);
 630   return(t);
 631 }
 632
 633
 634 /***************************************************************************
 635 return a HTTP/1.0 time string
 636   ***************************************************************************/
 637 char *http_timestring(time_t t)
 638 {
 639   static fstring buf;
 640   struct tm *tm = LocalTime(&t);
 641
 642   if (!tm)
 643     slprintf(buf,sizeof(buf)-1,"%ld seconds since the Epoch",(long)t);
 644   else
 645 #ifndef HAVE_STRFTIME
 646   fstrcpy(buf, asctime(tm));
 647   if(buf[strlen(buf)-1] == '\n')
 648     buf[strlen(buf)-1] = 0;
 649 #else /* !HAVE_STRFTIME */
 650   strftime(buf, sizeof(buf)-1, "%a, %d %b %Y %H:%M:%S %Z", tm);
 651 #endif /* !HAVE_STRFTIME */
 652   return buf;
 653 }
 654
 655
 656
 657 /****************************************************************************
 658  Return the date and time as a string
 659 ****************************************************************************/
 660
 661 char *timestring(BOOL hires)
 662 {
 663         static fstring TimeBuf;
 664         struct timeval tp;
 665         time_t t;
 666         struct tm *tm;
 667
 668         if (hires) {
 669                 GetTimeOfDay(&tp);
 670                 t = (time_t)tp.tv_sec;
 671         } else {
 672                 t = time(NULL);
 673         }
 674         tm = LocalTime(&t);
 675         if (!tm) {
 676                 if (hires) {
 677                         slprintf(TimeBuf,
 678                                  sizeof(TimeBuf)-1,
 679                                  "%ld.%06ld seconds since the Epoch",
 680                                  (long)tp.tv_sec,
 681                                  (long)tp.tv_usec);
 682                 } else {
 683                         slprintf(TimeBuf,
 684                                  sizeof(TimeBuf)-1,
 685                                  "%ld seconds since the Epoch",
 686                                  (long)t);
 687                 }
 688         } else {
 689 #ifdef HAVE_STRFTIME
 690                 if (hires) {
 691                         strftime(TimeBuf,sizeof(TimeBuf)-1,"%Y/%m/%d %H:%M:%S",tm);
 692                         slprintf(TimeBuf+strlen(TimeBuf),
 693                                  sizeof(TimeBuf)-1 - strlen(TimeBuf),
 694                                  ".%06ld",
 695                                  (long)tp.tv_usec);
 696                 } else {
 697                         strftime(TimeBuf,100,"%Y/%m/%d %H:%M:%S",tm);
 698                 }
 699 #else
 700                 if (hires) {
 701                         slprintf(TimeBuf,
 702                                  sizeof(TimeBuf)-1,
 703                                  "%s.%06ld",
 704                                  asctime(tm),
 705                                  (long)tp.tv_usec);
 706                 } else {
 707                         fstrcpy(TimeBuf, asctime(tm));
 708                 }
 709 #endif
 710         }
 711         return(TimeBuf);
 712 }
 713
 714 /****************************************************************************
 715   return the best approximation to a 'create time' under UNIX from a stat
 716   structure.
 717 ****************************************************************************/
 718
 719 time_t get_create_time(SMB_STRUCT_STAT *st,BOOL fake_dirs)
 720 {
 721   time_t ret, ret1;
 722
 723   if(S_ISDIR(st->st_mode) && fake_dirs)
 724     return (time_t)315493200L;          /* 1/1/1980 */
 725
 726   ret = MIN(st->st_ctime, st->st_mtime);
 727   ret1 = MIN(ret, st->st_atime);
 728
 729   if(ret1 != (time_t)0)
 730     return ret1;
 731
 732   /*
 733    * One of ctime, mtime or atime was zero (probably atime).
 734    * Just return MIN(ctime, mtime).
 735    */
 736   return ret;
 737 }
 738
 739 /****************************************************************************
 740 initialise an NTTIME to -1, which means "unknown" or "don't expire"
 741 ****************************************************************************/
 742
 743 void init_nt_time(NTTIME *nt)
 744 {
 745         nt->high = 0x7FFFFFFF;
 746         nt->low = 0xFFFFFFFF;
 747 }
 748
 749 /****************************************************************************
 750 check if NTTIME is 0
 751 ****************************************************************************/
 752 BOOL nt_time_is_zero(NTTIME *nt)
 753 {
 754         if(nt->high==0)
 755                 return True;
 756         return False;
 757 }