source3/lib/time.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    time handling functions
   4
   5    Copyright (C) Andrew Tridgell                1992-2004
   6    Copyright (C) Stefan (metze) Metzmacher      2002
   7    Copyright (C) Jeremy Allison                 2007
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24
  25 /**
  26  * @file
  27  * @brief time handling functions
  28  */
  29
  30
  31 #ifndef TIME_T_MIN
  32 #define TIME_T_MIN ((time_t)0 < (time_t) -1 ? (time_t) 0 \
  33                     : ~ (time_t) 0 << (sizeof (time_t) * CHAR_BIT - 1))
  34 #endif
  35 #ifndef TIME_T_MAX
  36 #define TIME_T_MAX (~ (time_t) 0 - TIME_T_MIN)
  37 #endif
  38
  39 #define NTTIME_INFINITY (NTTIME)0x8000000000000000LL
  40
  41 #if (SIZEOF_LONG == 8)
  42 #define TIME_FIXUP_CONSTANT_INT 11644473600L
  43 #elif (SIZEOF_LONG_LONG == 8)
  44 #define TIME_FIXUP_CONSTANT_INT 11644473600LL
  45 #endif
  46
  47 /*******************************************************************
  48   create a 16 bit dos packed date
  49 ********************************************************************/
  50 static uint16_t make_dos_date1(struct tm *t)
  51 {
  52         uint16_t ret=0;
  53         ret = (((unsigned int)(t->tm_mon+1)) >> 3) | ((t->tm_year-80) << 1);
  54         ret = ((ret&0xFF)<<8) | (t->tm_mday | (((t->tm_mon+1) & 0x7) << 5));
  55         return ret;
  56 }
  57
  58 /*******************************************************************
  59   create a 16 bit dos packed time
  60 ********************************************************************/
  61 static uint16_t make_dos_time1(struct tm *t)
  62 {
  63         uint16_t ret=0;
  64         ret = ((((unsigned int)t->tm_min >> 3)&0x7) | (((unsigned int)t->tm_hour) << 3));
  65         ret = ((ret&0xFF)<<8) | ((t->tm_sec/2) | ((t->tm_min & 0x7) << 5));
  66         return ret;
  67 }
  68
  69 /*******************************************************************
  70   create a 32 bit dos packed date/time from some parameters
  71   This takes a GMT time and returns a packed localtime structure
  72 ********************************************************************/
  73 static uint32_t make_dos_date(time_t unixdate, int zone_offset)
  74 {
  75         struct tm *t;
  76         uint32_t ret=0;
  77
  78         if (unixdate == 0) {
  79                 return 0;
  80         }
  81
  82         unixdate -= zone_offset;
  83
  84         t = gmtime(&unixdate);
  85         if (!t) {
  86                 return 0xFFFFFFFF;
  87         }
  88
  89         ret = make_dos_date1(t);
  90         ret = ((ret&0xFFFF)<<16) | make_dos_time1(t);
  91
  92         return ret;
  93 }
  94
  95 /**
  96   parse a nttime as a large integer in a string and return a NTTIME
  97 */
  98 NTTIME nttime_from_string(const char *s)
  99 {
 100         return strtoull(s, NULL, 0);
 101 }
 102
 103 /**************************************************************
 104  Handle conversions between time_t and uint32, taking care to
 105  preserve the "special" values.
 106 **************************************************************/
 107
 108 uint32_t convert_time_t_to_uint32(time_t t)
 109 {
 110 #if (defined(SIZEOF_TIME_T) && (SIZEOF_TIME_T == 8))
 111         /* time_t is 64-bit. */
 112         if (t == 0x8000000000000000LL) {
 113                 return 0x80000000;
 114         } else if (t == 0x7FFFFFFFFFFFFFFFLL) {
 115                 return 0x7FFFFFFF;
 116         }
 117 #endif
 118         return (uint32_t)t;
 119 }
 120
 121 time_t convert_uint32_to_time_t(uint32_t u)
 122 {
 123 #if (defined(SIZEOF_TIME_T) && (SIZEOF_TIME_T == 8))
 124         /* time_t is 64-bit. */
 125         if (u == 0x80000000) {
 126                 return (time_t)0x8000000000000000LL;
 127         } else if (u == 0x7FFFFFFF) {
 128                 return (time_t)0x7FFFFFFFFFFFFFFFLL;
 129         }
 130 #endif
 131         return (time_t)u;
 132 }
 133
 134 /****************************************************************************
 135  Check if NTTIME is 0.
 136 ****************************************************************************/
 137
 138 bool nt_time_is_zero(const NTTIME *nt)
 139 {
 140         return (*nt == 0);
 141 }
 142
 143 /****************************************************************************
 144  Convert ASN.1 GeneralizedTime string to unix-time.
 145  Returns 0 on failure; Currently ignores timezone.
 146 ****************************************************************************/
 147
 148 time_t generalized_to_unix_time(const char *str)
 149 {
 150         struct tm tm;
 151
 152         ZERO_STRUCT(tm);
 153
 154         if (sscanf(str, "%4d%2d%2d%2d%2d%2d",
 155                    &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
 156                    &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) {
 157                 return 0;
 158         }
 159         tm.tm_year -= 1900;
 160         tm.tm_mon -= 1;
 161
 162         return timegm(&tm);
 163 }
 164
 165 /*******************************************************************
 166  Accessor function for the server time zone offset.
 167  set_server_zone_offset() must have been called first.
 168 ******************************************************************/
 169
 170 static int server_zone_offset;
 171
 172 int get_server_zone_offset(void)
 173 {
 174         return server_zone_offset;
 175 }
 176
 177 /*******************************************************************
 178  Initialize the server time zone offset. Called when a client connects.
 179 ******************************************************************/
 180
 181 int set_server_zone_offset(time_t t)
 182 {
 183         server_zone_offset = get_time_zone(t);
 184         return server_zone_offset;
 185 }
 186
 187 /****************************************************************************
 188  Return the date and time as a string
 189 ****************************************************************************/
 190
 191 char *current_timestring(TALLOC_CTX *ctx, bool hires)
 192 {
 193         fstring TimeBuf;
 194         struct timeval tp;
 195         time_t t;
 196         struct tm *tm;
 197
 198         if (hires) {
 199                 GetTimeOfDay(&tp);
 200                 t = (time_t)tp.tv_sec;
 201         } else {
 202                 t = time(NULL);
 203         }
 204         tm = localtime(&t);
 205         if (!tm) {
 206                 if (hires) {
 207                         slprintf(TimeBuf,
 208                                  sizeof(TimeBuf)-1,
 209                                  "%ld.%06ld seconds since the Epoch",
 210                                  (long)tp.tv_sec,
 211                                  (long)tp.tv_usec);
 212                 } else {
 213                         slprintf(TimeBuf,
 214                                  sizeof(TimeBuf)-1,
 215                                  "%ld seconds since the Epoch",
 216                                  (long)t);
 217                 }
 218         } else {
 219 #ifdef HAVE_STRFTIME
 220                 if (hires) {
 221                         strftime(TimeBuf,sizeof(TimeBuf)-1,"%Y/%m/%d %H:%M:%S",tm);
 222                         slprintf(TimeBuf+strlen(TimeBuf),
 223                                  sizeof(TimeBuf)-1 - strlen(TimeBuf),
 224                                  ".%06ld",
 225                                  (long)tp.tv_usec);
 226                 } else {
 227                         strftime(TimeBuf,sizeof(TimeBuf)-1,"%Y/%m/%d %H:%M:%S",tm);
 228                 }
 229 #else
 230                 if (hires) {
 231                         const char *asct = asctime(tm);
 232                         slprintf(TimeBuf,
 233                                  sizeof(TimeBuf)-1,
 234                                  "%s.%06ld",
 235                                  asct ? asct : "unknown",
 236                                  (long)tp.tv_usec);
 237                 } else {
 238                         const char *asct = asctime(tm);
 239                         fstrcpy(TimeBuf, asct ? asct : "unknown");
 240                 }
 241 #endif
 242         }
 243         return talloc_strdup(ctx, TimeBuf);
 244 }
 245
 246
 247 /*******************************************************************
 248  Put a dos date into a buffer (time/date format).
 249  This takes GMT time and puts local time in the buffer.
 250 ********************************************************************/
 251
 252 static void put_dos_date(char *buf,int offset,time_t unixdate, int zone_offset)
 253 {
 254         uint32_t x = make_dos_date(unixdate, zone_offset);
 255         SIVAL(buf,offset,x);
 256 }
 257
 258 /*******************************************************************
 259  Put a dos date into a buffer (date/time format).
 260  This takes GMT time and puts local time in the buffer.
 261 ********************************************************************/
 262
 263 static void put_dos_date2(char *buf,int offset,time_t unixdate, int zone_offset)
 264 {
 265         uint32_t x = make_dos_date(unixdate, zone_offset);
 266         x = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
 267         SIVAL(buf,offset,x);
 268 }
 269
 270 /*******************************************************************
 271  Put a dos 32 bit "unix like" date into a buffer. This routine takes
 272  GMT and converts it to LOCAL time before putting it (most SMBs assume
 273  localtime for this sort of date)
 274 ********************************************************************/
 275
 276 static void put_dos_date3(char *buf,int offset,time_t unixdate, int zone_offset)
 277 {
 278         if (!null_mtime(unixdate)) {
 279                 unixdate -= zone_offset;
 280         }
 281         SIVAL(buf,offset,unixdate);
 282 }
 283
 284
 285 /***************************************************************************
 286  Server versions of the above functions.
 287 ***************************************************************************/
 288
 289 void srv_put_dos_date(char *buf,int offset,time_t unixdate)
 290 {
 291         put_dos_date(buf, offset, unixdate, server_zone_offset);
 292 }
 293
 294 void srv_put_dos_date2(char *buf,int offset, time_t unixdate)
 295 {
 296         put_dos_date2(buf, offset, unixdate, server_zone_offset);
 297 }
 298
 299 void srv_put_dos_date3(char *buf,int offset,time_t unixdate)
 300 {
 301         put_dos_date3(buf, offset, unixdate, server_zone_offset);
 302 }
 303
 304 void round_timespec(enum timestamp_set_resolution res, struct timespec *ts)
 305 {
 306         switch (res) {
 307                 case TIMESTAMP_SET_SECONDS:
 308                         round_timespec_to_sec(ts);
 309                         break;
 310                 case TIMESTAMP_SET_MSEC:
 311                         round_timespec_to_usec(ts);
 312                         break;
 313                 case TIMESTAMP_SET_NT_OR_BETTER:
 314                         /* No rounding needed. */
 315                         break;
 316         }
 317 }
 318
 319 /****************************************************************************
 320  Take a Unix time and convert to an NTTIME structure and place in buffer
 321  pointed to by p, rounded to the correct resolution.
 322 ****************************************************************************/
 323
 324 void put_long_date_timespec(enum timestamp_set_resolution res, char *p, struct timespec ts)
 325 {
 326         NTTIME nt;
 327         round_timespec(res, &ts);
 328         unix_timespec_to_nt_time(&nt, ts);
 329         SIVAL(p, 0, nt & 0xFFFFFFFF);
 330         SIVAL(p, 4, nt >> 32);
 331 }
 332
 333 void put_long_date(char *p, time_t t)
 334 {
 335         struct timespec ts;
 336         ts.tv_sec = t;
 337         ts.tv_nsec = 0;
 338         put_long_date_timespec(TIMESTAMP_SET_SECONDS, p, ts);
 339 }
 340
 341 void dos_filetime_timespec(struct timespec *tsp)
 342 {
 343         tsp->tv_sec &= ~1;
 344         tsp->tv_nsec = 0;
 345 }
 346
 347 /*******************************************************************
 348  Create a unix date (int GMT) from a dos date (which is actually in
 349  localtime).
 350 ********************************************************************/
 351
 352 static time_t make_unix_date(const void *date_ptr, int zone_offset)
 353 {
 354         uint32_t dos_date=0;
 355         struct tm t;
 356         time_t ret;
 357
 358         dos_date = IVAL(date_ptr,0);
 359
 360         if (dos_date == 0) {
 361                 return 0;
 362         }
 363
 364         interpret_dos_date(dos_date,&t.tm_year,&t.tm_mon,
 365                         &t.tm_mday,&t.tm_hour,&t.tm_min,&t.tm_sec);
 366         t.tm_isdst = -1;
 367
 368         ret = timegm(&t);
 369
 370         ret += zone_offset;
 371
 372         return(ret);
 373 }
 374
 375 /*******************************************************************
 376  Like make_unix_date() but the words are reversed.
 377 ********************************************************************/
 378
 379 time_t make_unix_date2(const void *date_ptr, int zone_offset)
 380 {
 381         uint32_t x,x2;
 382
 383         x = IVAL(date_ptr,0);
 384         x2 = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
 385         SIVAL(&x,0,x2);
 386
 387         return(make_unix_date((const void *)&x, zone_offset));
 388 }
 389
 390 /*******************************************************************
 391  Create a unix GMT date from a dos date in 32 bit "unix like" format
 392  these generally arrive as localtimes, with corresponding DST.
 393 ******************************************************************/
 394
 395 time_t make_unix_date3(const void *date_ptr, int zone_offset)
 396 {
 397         time_t t = (time_t)IVAL(date_ptr,0);
 398         if (!null_mtime(t)) {
 399                 t += zone_offset;
 400         }
 401         return(t);
 402 }
 403
 404 time_t srv_make_unix_date(const void *date_ptr)
 405 {
 406         return make_unix_date(date_ptr, server_zone_offset);
 407 }
 408
 409 time_t srv_make_unix_date2(const void *date_ptr)
 410 {
 411         return make_unix_date2(date_ptr, server_zone_offset);
 412 }
 413
 414 time_t srv_make_unix_date3(const void *date_ptr)
 415 {
 416         return make_unix_date3(date_ptr, server_zone_offset);
 417 }
 418
 419 /****************************************************************************
 420  Convert a normalized timeval to a timespec.
 421 ****************************************************************************/
 422
 423 struct timespec convert_timeval_to_timespec(const struct timeval tv)
 424 {
 425         struct timespec ts;
 426         ts.tv_sec = tv.tv_sec;
 427         ts.tv_nsec = tv.tv_usec * 1000;
 428         return ts;
 429 }
 430
 431 /****************************************************************************
 432  Convert a normalized timespec to a timeval.
 433 ****************************************************************************/
 434
 435 struct timeval convert_timespec_to_timeval(const struct timespec ts)
 436 {
 437         struct timeval tv;
 438         tv.tv_sec = ts.tv_sec;
 439         tv.tv_usec = ts.tv_nsec / 1000;
 440         return tv;
 441 }
 442
 443 /****************************************************************************
 444  Return a timespec for the current time
 445 ****************************************************************************/
 446
 447 struct timespec timespec_current(void)
 448 {
 449         struct timeval tv;
 450         struct timespec ts;
 451         GetTimeOfDay(&tv);
 452         ts.tv_sec = tv.tv_sec;
 453         ts.tv_nsec = tv.tv_usec * 1000;
 454         return ts;
 455 }
 456
 457 /****************************************************************************
 458  Return the lesser of two timespecs.
 459 ****************************************************************************/
 460
 461 struct timespec timespec_min(const struct timespec *ts1,
 462                            const struct timespec *ts2)
 463 {
 464         if (ts1->tv_sec < ts2->tv_sec) return *ts1;
 465         if (ts1->tv_sec > ts2->tv_sec) return *ts2;
 466         if (ts1->tv_nsec < ts2->tv_nsec) return *ts1;
 467         return *ts2;
 468 }
 469
 470 /****************************************************************************
 471   compare two timespec structures.
 472   Return -1 if ts1 < ts2
 473   Return 0 if ts1 == ts2
 474   Return 1 if ts1 > ts2
 475 ****************************************************************************/
 476
 477 int timespec_compare(const struct timespec *ts1, const struct timespec *ts2)
 478 {
 479         if (ts1->tv_sec  > ts2->tv_sec)  return 1;
 480         if (ts1->tv_sec  < ts2->tv_sec)  return -1;
 481         if (ts1->tv_nsec > ts2->tv_nsec) return 1;
 482         if (ts1->tv_nsec < ts2->tv_nsec) return -1;
 483         return 0;
 484 }
 485
 486 /****************************************************************************
 487  Round up a timespec if nsec > 500000000, round down if lower,
 488  then zero nsec.
 489 ****************************************************************************/
 490
 491 void round_timespec_to_sec(struct timespec *ts)
 492 {
 493         ts->tv_sec = convert_timespec_to_time_t(*ts);
 494         ts->tv_nsec = 0;
 495 }
 496
 497 /****************************************************************************
 498  Round a timespec to usec value.
 499 ****************************************************************************/
 500
 501 void round_timespec_to_usec(struct timespec *ts)
 502 {
 503         struct timeval tv = convert_timespec_to_timeval(*ts);
 504         *ts = convert_timeval_to_timespec(tv);
 505 }
 506
 507 /****************************************************************************
 508  Interprets an nt time into a unix struct timespec.
 509  Differs from nt_time_to_unix in that an 8 byte value of 0xffffffffffffffff
 510  will be returned as (time_t)-1, whereas nt_time_to_unix returns 0 in this case.
 511 ****************************************************************************/
 512
 513 struct timespec interpret_long_date(const char *p)
 514 {
 515         NTTIME nt;
 516         nt = IVAL(p,0) + ((uint64_t)IVAL(p,4) << 32);
 517         if (nt == (uint64_t)-1) {
 518                 struct timespec ret;
 519                 ret.tv_sec = (time_t)-1;
 520                 ret.tv_nsec = 0;
 521                 return ret;
 522         }
 523         return nt_time_to_unix_timespec(&nt);
 524 }
 525
 526 /***************************************************************************
 527  Client versions of the above functions.
 528 ***************************************************************************/
 529
 530 void cli_put_dos_date(struct cli_state *cli, char *buf, int offset, time_t unixdate)
 531 {
 532         put_dos_date(buf, offset, unixdate, cli->serverzone);
 533 }
 534
 535 void cli_put_dos_date2(struct cli_state *cli, char *buf, int offset, time_t unixdate)
 536 {
 537         put_dos_date2(buf, offset, unixdate, cli->serverzone);
 538 }
 539
 540 void cli_put_dos_date3(struct cli_state *cli, char *buf, int offset, time_t unixdate)
 541 {
 542         put_dos_date3(buf, offset, unixdate, cli->serverzone);
 543 }
 544
 545 time_t cli_make_unix_date(struct cli_state *cli, const void *date_ptr)
 546 {
 547         return make_unix_date(date_ptr, cli->serverzone);
 548 }
 549
 550 time_t cli_make_unix_date2(struct cli_state *cli, const void *date_ptr)
 551 {
 552         return make_unix_date2(date_ptr, cli->serverzone);
 553 }
 554
 555 time_t cli_make_unix_date3(struct cli_state *cli, const void *date_ptr)
 556 {
 557         return make_unix_date3(date_ptr, cli->serverzone);
 558 }
 559
 560 /****************************************************************************
 561  Check if two NTTIMEs are the same.
 562 ****************************************************************************/
 563
 564 bool nt_time_equals(const NTTIME *nt1, const NTTIME *nt2)
 565 {
 566         return (*nt1 == *nt2);
 567 }
 568
 569 /*******************************************************************
 570  Re-read the smb serverzone value.
 571 ******************************************************************/
 572
 573 static struct timeval start_time_hires;
 574
 575 void TimeInit(void)
 576 {
 577         set_server_zone_offset(time(NULL));
 578
 579         DEBUG(4,("TimeInit: Serverzone is %d\n", server_zone_offset));
 580
 581         /* Save the start time of this process. */
 582         if (start_time_hires.tv_sec == 0 && start_time_hires.tv_usec == 0) {
 583                 GetTimeOfDay(&start_time_hires);
 584         }
 585 }
 586
 587 /**********************************************************************
 588  Return a timeval struct of the uptime of this process. As TimeInit is
 589  done before a daemon fork then this is the start time from the parent
 590  daemon start. JRA.
 591 ***********************************************************************/
 592
 593 void get_process_uptime(struct timeval *ret_time)
 594 {
 595         struct timeval time_now_hires;
 596
 597         GetTimeOfDay(&time_now_hires);
 598         ret_time->tv_sec = time_now_hires.tv_sec - start_time_hires.tv_sec;
 599         if (time_now_hires.tv_usec < start_time_hires.tv_usec) {
 600                 ret_time->tv_sec -= 1;
 601                 ret_time->tv_usec = 1000000 + (time_now_hires.tv_usec - start_time_hires.tv_usec);
 602         } else {
 603                 ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
 604         }
 605 }
 606
 607 /****************************************************************************
 608  Convert a NTTIME structure to a time_t.
 609  It's originally in "100ns units".
 610
 611  This is an absolute version of the one above.
 612  By absolute I mean, it doesn't adjust from 1/1/1601 to 1/1/1970
 613  if the NTTIME was 5 seconds, the time_t is 5 seconds. JFM
 614 ****************************************************************************/
 615
 616 time_t nt_time_to_unix_abs(const NTTIME *nt)
 617 {
 618         uint64_t d;
 619
 620         if (*nt == 0) {
 621                 return (time_t)0;
 622         }
 623
 624         if (*nt == (uint64_t)-1) {
 625                 return (time_t)-1;
 626         }
 627
 628         if (*nt == NTTIME_INFINITY) {
 629                 return (time_t)-1;
 630         }
 631
 632         /* reverse the time */
 633         /* it's a negative value, turn it to positive */
 634         d=~*nt;
 635
 636         d += 1000*1000*10/2;
 637         d /= 1000*1000*10;
 638
 639         if (!(TIME_T_MIN <= ((time_t)d) && ((time_t)d) <= TIME_T_MAX)) {
 640                 return (time_t)0;
 641         }
 642
 643         return (time_t)d;
 644 }
 645
 646 time_t uint64s_nt_time_to_unix_abs(const uint64_t *src)
 647 {
 648         NTTIME nttime;
 649         nttime = *src;
 650         return nt_time_to_unix_abs(&nttime);
 651 }
 652
 653 /****************************************************************************
 654  Put a 8 byte filetime from a struct timespec. Uses GMT.
 655 ****************************************************************************/
 656
 657 void unix_timespec_to_nt_time(NTTIME *nt, struct timespec ts)
 658 {
 659         uint64_t d;
 660
 661         if (ts.tv_sec ==0 && ts.tv_nsec == 0) {
 662                 *nt = 0;
 663                 return;
 664         }
 665         if (ts.tv_sec == TIME_T_MAX) {
 666                 *nt = 0x7fffffffffffffffLL;
 667                 return;
 668         }
 669         if (ts.tv_sec == (time_t)-1) {
 670                 *nt = (uint64_t)-1;
 671                 return;
 672         }
 673
 674         d = ts.tv_sec;
 675         d += TIME_FIXUP_CONSTANT_INT;
 676         d *= 1000*1000*10;
 677         /* d is now in 100ns units. */
 678         d += (ts.tv_nsec / 100);
 679
 680         *nt = d;
 681 }
 682
 683 /****************************************************************************
 684  Convert a time_t to a NTTIME structure
 685
 686  This is an absolute version of the one above.
 687  By absolute I mean, it doesn't adjust from 1/1/1970 to 1/1/1601
 688  If the time_t was 5 seconds, the NTTIME is 5 seconds. JFM
 689 ****************************************************************************/
 690
 691 void unix_to_nt_time_abs(NTTIME *nt, time_t t)
 692 {
 693         double d;
 694
 695         if (t==0) {
 696                 *nt = 0;
 697                 return;
 698         }
 699
 700         if (t == TIME_T_MAX) {
 701                 *nt = 0x7fffffffffffffffLL;
 702                 return;
 703         }
 704
 705         if (t == (time_t)-1) {
 706                 /* that's what NT uses for infinite */
 707                 *nt = NTTIME_INFINITY;
 708                 return;
 709         }
 710
 711         d = (double)(t);
 712         d *= 1.0e7;
 713
 714         *nt = (NTTIME)d;
 715
 716         /* convert to a negative value */
 717         *nt=~*nt;
 718 }
 719
 720
 721 /****************************************************************************
 722  Check if it's a null mtime.
 723 ****************************************************************************/
 724
 725 bool null_mtime(time_t mtime)
 726 {
 727         if (mtime == 0 || mtime == (time_t)0xFFFFFFFF || mtime == (time_t)-1)
 728                 return true;
 729         return false;
 730 }
 731
 732 /****************************************************************************
 733  Utility function that always returns a const string even if localtime
 734  and asctime fail.
 735 ****************************************************************************/
 736
 737 const char *time_to_asc(const time_t t)
 738 {
 739         const char *asct;
 740         struct tm *lt = localtime(&t);
 741
 742         if (!lt) {
 743                 return "unknown time";
 744         }
 745
 746         asct = asctime(lt);
 747         if (!asct) {
 748                 return "unknown time";
 749         }
 750         return asct;
 751 }
 752
 753 const char *display_time(NTTIME nttime)
 754 {
 755         float high;
 756         float low;
 757         int sec;
 758         int days, hours, mins, secs;
 759
 760         if (nttime==0)
 761                 return "Now";
 762
 763         if (nttime==NTTIME_INFINITY)
 764                 return "Never";
 765
 766         high = 65536;
 767         high = high/10000;
 768         high = high*65536;
 769         high = high/1000;
 770         high = high * (~(nttime >> 32));
 771
 772         low = ~(nttime & 0xFFFFFFFF);
 773         low = low/(1000*1000*10);
 774
 775         sec=(int)(high+low);
 776
 777         days=sec/(60*60*24);
 778         hours=(sec - (days*60*60*24)) / (60*60);
 779         mins=(sec - (days*60*60*24) - (hours*60*60) ) / 60;
 780         secs=sec - (days*60*60*24) - (hours*60*60) - (mins*60);
 781
 782         return talloc_asprintf(talloc_tos(), "%u days, %u hours, %u minutes, "
 783                                "%u seconds", days, hours, mins, secs);
 784 }
 785
 786 bool nt_time_is_set(const NTTIME *nt)
 787 {
 788         if (*nt == 0x7FFFFFFFFFFFFFFFLL) {
 789                 return false;
 790         }
 791
 792         if (*nt == NTTIME_INFINITY) {
 793                 return false;
 794         }
 795
 796         return true;
 797 }