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 (!(l_time_min <= d && d <= l_time_max))
 322     return(0);
 323
 324   ret = (time_t)(d+0.5);
 325
 326   /* this takes us from kludge-GMT to real GMT */
 327   ret -= get_serverzone();
 328   ret += LocTimeDiff(ret);
 329
 330   return(ret);
 331 }
 332
 333 /****************************************************************************
 334  Convert a NTTIME structure to a time_t.
 335  It's originally in "100ns units".
 336
 337  This is an absolute version of the one above.
 338  By absolute I mean, it doesn't adjust from 1/1/1601 to 1/1/1970
 339  if the NTTIME was 5 seconds, the time_t is 5 seconds. JFM
 340 ****************************************************************************/
 341
 342 time_t nt_time_to_unix_abs(NTTIME *nt)
 343 {
 344         double d;
 345         time_t ret;
 346         /* The next two lines are a fix needed for the
 347            broken SCO compiler. JRA. */
 348         time_t l_time_min = TIME_T_MIN;
 349         time_t l_time_max = TIME_T_MAX;
 350
 351         if (nt->high == 0)
 352                 return(0);
 353
 354         if (nt->high==0x80000000 && nt->low==0)
 355                 return -1;
 356
 357         /* reverse the time */
 358         /* it's a negative value, turn it to positive */
 359         nt->high=~nt->high;
 360         nt->low=~nt->low;
 361
 362         d = ((double)nt->high)*4.0*(double)(1<<30);
 363         d += (nt->low&0xFFF00000);
 364         d *= 1.0e-7;
 365
 366         if (!(l_time_min <= d && d <= l_time_max))
 367                 return(0);
 368
 369         ret = (time_t)(d+0.5);
 370
 371         return(ret);
 372 }
 373
 374 /****************************************************************************
 375 interprets an nt time into a unix time_t
 376 ****************************************************************************/
 377 time_t interpret_long_date(char *p)
 378 {
 379         NTTIME nt;
 380         nt.low = IVAL(p,0);
 381         nt.high = IVAL(p,4);
 382         return nt_time_to_unix(&nt);
 383 }
 384
 385 /****************************************************************************
 386 put a 8 byte filetime from a time_t
 387 This takes real GMT as input and converts to kludge-GMT
 388 ****************************************************************************/
 389 void unix_to_nt_time(NTTIME *nt, time_t t)
 390 {
 391         double d;
 392
 393         if (t==0)
 394         {
 395                 nt->low = 0;
 396                 nt->high = 0;
 397                 return;
 398         }
 399         if (t == TIME_T_MAX)
 400         {
 401                 nt->low = 0xffffffff;
 402                 nt->high = 0x7fffffff;
 403                 return;
 404         }
 405         if (t == -1)
 406         {
 407                 nt->low = 0xffffffff;
 408                 nt->high = 0xffffffff;
 409                 return;
 410         }
 411
 412         /* this converts GMT to kludge-GMT */
 413         t -= TimeDiff(t) - get_serverzone();
 414
 415         d = (double)(t);
 416         d += TIME_FIXUP_CONSTANT;
 417         d *= 1.0e7;
 418
 419         nt->high = (uint32)(d * (1.0/(4.0*(double)(1<<30))));
 420         nt->low  = (uint32)(d - ((double)nt->high)*4.0*(double)(1<<30));
 421 }
 422
 423 /****************************************************************************
 424  Convert a time_t to a NTTIME structure
 425
 426  This is an absolute version of the one above.
 427  By absolute I mean, it doesn't adjust from 1/1/1970 to 1/1/1601
 428  If the nttime_t was 5 seconds, the NTTIME is 5 seconds. JFM
 429 ****************************************************************************/
 430
 431 void unix_to_nt_time_abs(NTTIME *nt, time_t t)
 432 {
 433         double d;
 434
 435         if (t==0) {
 436                 nt->low = 0;
 437                 nt->high = 0;
 438                 return;
 439         }
 440
 441         if (t == TIME_T_MAX) {
 442                 nt->low = 0xffffffff;
 443                 nt->high = 0x7fffffff;
 444                 return;
 445         }
 446
 447         if (t == -1) {
 448                 /* that's what NT uses for infinite */
 449                 nt->low = 0x0;
 450                 nt->high = 0x80000000;
 451                 return;
 452         }
 453
 454         d = (double)(t);
 455         d *= 1.0e7;
 456
 457         nt->high = (uint32)(d * (1.0/(4.0*(double)(1<<30))));
 458         nt->low  = (uint32)(d - ((double)nt->high)*4.0*(double)(1<<30));
 459
 460         /* convert to a negative value */
 461         nt->high=~nt->high;
 462         nt->low=~nt->low;
 463 }
 464
 465
 466 /****************************************************************************
 467 take an NTTIME structure, containing high / low time.  convert to unix time.
 468 lkclXXXX this may need 2 SIVALs not a memcpy.  we'll see...
 469 ****************************************************************************/
 470 void put_long_date(char *p,time_t t)
 471 {
 472         NTTIME nt;
 473         unix_to_nt_time(&nt, t);
 474         SIVAL(p, 0, nt.low);
 475         SIVAL(p, 4, nt.high);
 476 }
 477
 478 /****************************************************************************
 479 check if it's a null mtime
 480 ****************************************************************************/
 481 BOOL null_mtime(time_t mtime)
 482 {
 483   if (mtime == 0 || mtime == (time_t)0xFFFFFFFF || mtime == (time_t)-1)
 484     return(True);
 485   return(False);
 486 }
 487
 488 /*******************************************************************
 489   create a 16 bit dos packed date
 490 ********************************************************************/
 491 static uint16 make_dos_date1(struct tm *t)
 492 {
 493   uint16 ret=0;
 494   ret = (((unsigned)(t->tm_mon+1)) >> 3) | ((t->tm_year-80) << 1);
 495   ret = ((ret&0xFF)<<8) | (t->tm_mday | (((t->tm_mon+1) & 0x7) << 5));
 496   return(ret);
 497 }
 498
 499 /*******************************************************************
 500   create a 16 bit dos packed time
 501 ********************************************************************/
 502 static uint16 make_dos_time1(struct tm *t)
 503 {
 504   uint16 ret=0;
 505   ret = ((((unsigned)t->tm_min >> 3)&0x7) | (((unsigned)t->tm_hour) << 3));
 506   ret = ((ret&0xFF)<<8) | ((t->tm_sec/2) | ((t->tm_min & 0x7) << 5));
 507   return(ret);
 508 }
 509
 510 /*******************************************************************
 511   create a 32 bit dos packed date/time from some parameters
 512   This takes a GMT time and returns a packed localtime structure
 513 ********************************************************************/
 514 static uint32 make_dos_date(time_t unixdate)
 515 {
 516   struct tm *t;
 517   uint32 ret=0;
 518
 519   t = LocalTime(&unixdate);
 520   if (!t)
 521     return 0xFFFFFFFF;
 522
 523   ret = make_dos_date1(t);
 524   ret = ((ret&0xFFFF)<<16) | make_dos_time1(t);
 525
 526   return(ret);
 527 }
 528
 529 /*******************************************************************
 530 put a dos date into a buffer (time/date format)
 531 This takes GMT time and puts local time in the buffer
 532 ********************************************************************/
 533 void put_dos_date(char *buf,int offset,time_t unixdate)
 534 {
 535   uint32 x = make_dos_date(unixdate);
 536   SIVAL(buf,offset,x);
 537 }
 538
 539 /*******************************************************************
 540 put a dos date into a buffer (date/time format)
 541 This takes GMT time and puts local time in the buffer
 542 ********************************************************************/
 543 void put_dos_date2(char *buf,int offset,time_t unixdate)
 544 {
 545   uint32 x = make_dos_date(unixdate);
 546   x = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
 547   SIVAL(buf,offset,x);
 548 }
 549
 550 /*******************************************************************
 551 put a dos 32 bit "unix like" date into a buffer. This routine takes
 552 GMT and converts it to LOCAL time before putting it (most SMBs assume
 553 localtime for this sort of date)
 554 ********************************************************************/
 555 void put_dos_date3(char *buf,int offset,time_t unixdate)
 556 {
 557   if (!null_mtime(unixdate))
 558     unixdate -= TimeDiff(unixdate);
 559   SIVAL(buf,offset,unixdate);
 560 }
 561
 562 /*******************************************************************
 563   interpret a 32 bit dos packed date/time to some parameters
 564 ********************************************************************/
 565 static void interpret_dos_date(uint32 date,int *year,int *month,int *day,int *hour,int *minute,int *second)
 566 {
 567   uint32 p0,p1,p2,p3;
 568
 569   p0=date&0xFF; p1=((date&0xFF00)>>8)&0xFF;
 570   p2=((date&0xFF0000)>>16)&0xFF; p3=((date&0xFF000000)>>24)&0xFF;
 571
 572   *second = 2*(p0 & 0x1F);
 573   *minute = ((p0>>5)&0xFF) + ((p1&0x7)<<3);
 574   *hour = (p1>>3)&0xFF;
 575   *day = (p2&0x1F);
 576   *month = ((p2>>5)&0xFF) + ((p3&0x1)<<3) - 1;
 577   *year = ((p3>>1)&0xFF) + 80;
 578 }
 579
 580 /*******************************************************************
 581   create a unix date (int GMT) from a dos date (which is actually in
 582   localtime)
 583 ********************************************************************/
 584 time_t make_unix_date(void *date_ptr)
 585 {
 586   uint32 dos_date=0;
 587   struct tm t;
 588   time_t ret;
 589
 590   dos_date = IVAL(date_ptr,0);
 591
 592   if (dos_date == 0) return(0);
 593
 594   interpret_dos_date(dos_date,&t.tm_year,&t.tm_mon,
 595                      &t.tm_mday,&t.tm_hour,&t.tm_min,&t.tm_sec);
 596   t.tm_isdst = -1;
 597
 598   /* mktime() also does the local to GMT time conversion for us */
 599   ret = mktime(&t);
 600
 601   return(ret);
 602 }
 603
 604 /*******************************************************************
 605 like make_unix_date() but the words are reversed
 606 ********************************************************************/
 607 time_t make_unix_date2(void *date_ptr)
 608 {
 609   uint32 x,x2;
 610
 611   x = IVAL(date_ptr,0);
 612   x2 = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
 613   SIVAL(&x,0,x2);
 614
 615   return(make_unix_date((void *)&x));
 616 }
 617
 618 /*******************************************************************
 619   create a unix GMT date from a dos date in 32 bit "unix like" format
 620   these generally arrive as localtimes, with corresponding DST
 621   ******************************************************************/
 622 time_t make_unix_date3(void *date_ptr)
 623 {
 624   time_t t = (time_t)IVAL(date_ptr,0);
 625   if (!null_mtime(t))
 626     t += LocTimeDiff(t);
 627   return(t);
 628 }
 629
 630
 631 /***************************************************************************
 632 return a HTTP/1.0 time string
 633   ***************************************************************************/
 634 char *http_timestring(time_t t)
 635 {
 636   static fstring buf;
 637   struct tm *tm = LocalTime(&t);
 638
 639   if (!tm)
 640     slprintf(buf,sizeof(buf)-1,"%ld seconds since the Epoch",(long)t);
 641   else
 642 #ifndef HAVE_STRFTIME
 643   fstrcpy(buf, asctime(tm));
 644   if(buf[strlen(buf)-1] == '\n')
 645     buf[strlen(buf)-1] = 0;
 646 #else /* !HAVE_STRFTIME */
 647   strftime(buf, sizeof(buf)-1, "%a, %d %b %Y %H:%M:%S %Z", tm);
 648 #endif /* !HAVE_STRFTIME */
 649   return buf;
 650 }
 651
 652
 653
 654 /****************************************************************************
 655  Return the date and time as a string
 656 ****************************************************************************/
 657
 658 char *timestring(BOOL hires)
 659 {
 660         static fstring TimeBuf;
 661         struct timeval tp;
 662         time_t t;
 663         struct tm *tm;
 664
 665         if (hires) {
 666                 GetTimeOfDay(&tp);
 667                 t = (time_t)tp.tv_sec;
 668         } else {
 669                 t = time(NULL);
 670         }
 671         tm = LocalTime(&t);
 672         if (!tm) {
 673                 if (hires) {
 674                         slprintf(TimeBuf,
 675                                  sizeof(TimeBuf)-1,
 676                                  "%ld.%06ld seconds since the Epoch",
 677                                  (long)tp.tv_sec,
 678                                  (long)tp.tv_usec);
 679                 } else {
 680                         slprintf(TimeBuf,
 681                                  sizeof(TimeBuf)-1,
 682                                  "%ld seconds since the Epoch",
 683                                  (long)t);
 684                 }
 685         } else {
 686 #ifdef HAVE_STRFTIME
 687                 if (hires) {
 688                         strftime(TimeBuf,sizeof(TimeBuf)-1,"%Y/%m/%d %H:%M:%S",tm);
 689                         slprintf(TimeBuf+strlen(TimeBuf),
 690                                  sizeof(TimeBuf)-1 - strlen(TimeBuf),
 691                                  ".%06ld",
 692                                  (long)tp.tv_usec);
 693                 } else {
 694                         strftime(TimeBuf,100,"%Y/%m/%d %H:%M:%S",tm);
 695                 }
 696 #else
 697                 if (hires) {
 698                         slprintf(TimeBuf,
 699                                  sizeof(TimeBuf)-1,
 700                                  "%s.%06ld",
 701                                  asctime(tm),
 702                                  (long)tp.tv_usec);
 703                 } else {
 704                         fstrcpy(TimeBuf, asctime(tm));
 705                 }
 706 #endif
 707         }
 708         return(TimeBuf);
 709 }
 710
 711 /****************************************************************************
 712   return the best approximation to a 'create time' under UNIX from a stat
 713   structure.
 714 ****************************************************************************/
 715
 716 time_t get_create_time(SMB_STRUCT_STAT *st,BOOL fake_dirs)
 717 {
 718   time_t ret, ret1;
 719
 720   if(S_ISDIR(st->st_mode) && fake_dirs)
 721     return (time_t)315493200L;          /* 1/1/1980 */
 722
 723   ret = MIN(st->st_ctime, st->st_mtime);
 724   ret1 = MIN(ret, st->st_atime);
 725
 726   if(ret1 != (time_t)0)
 727     return ret1;
 728
 729   /*
 730    * One of ctime, mtime or atime was zero (probably atime).
 731    * Just return MIN(ctime, mtime).
 732    */
 733   return ret;
 734 }
 735
 736 /****************************************************************************
 737 initialise an NTTIME to -1, which means "unknown" or "don't expire"
 738 ****************************************************************************/
 739
 740 void init_nt_time(NTTIME *nt)
 741 {
 742         nt->high = 0x7FFFFFFF;
 743         nt->low = 0xFFFFFFFF;
 744 }
 745
 746 /****************************************************************************
 747 check if NTTIME is 0
 748 ****************************************************************************/
 749 BOOL nt_time_is_zero(NTTIME *nt)
 750 {
 751         if(nt->high==0)
 752                 return True;
 753         return False;
 754 }