2 Unix SMB/CIFS implementation.
3 time handling functions
5 Copyright (C) Andrew Tridgell 1992-2004
6 Copyright (C) Stefan (metze) Metzmacher 2002
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include "system/time.h"
28 * @brief time handling functions
32 /* we use 0 here, because (time_t)-1 means error */
37 * we use the INT32_MAX here as on 64 bit systems,
38 * gmtime() fails with INT64_MAX
42 #define TIME_T_MAX MIN(INT32_MAX,_TYPE_MAXIMUM(time_t))
46 External access to time_t_min and time_t_max.
48 _PUBLIC_ time_t get_time_t_max(void)
54 a gettimeofday wrapper
56 _PUBLIC_ void GetTimeOfDay(struct timeval *tval)
58 #ifdef HAVE_GETTIMEOFDAY_TZ
59 gettimeofday(tval,NULL);
66 #define TIME_FIXUP_CONSTANT 11644473600LL
69 interpret an 8 byte "filetime" structure to a time_t
70 It's originally in "100ns units since jan 1st 1601"
72 _PUBLIC_ time_t nt_time_to_unix(NTTIME nt)
82 nt -= TIME_FIXUP_CONSTANT;
84 if (TIME_T_MIN > nt || nt > TIME_T_MAX) {
93 put a 8 byte filetime from a time_t
94 This takes GMT as input
96 _PUBLIC_ void unix_to_nt_time(NTTIME *nt, time_t t)
100 if (t == (time_t)-1) {
110 t2 += TIME_FIXUP_CONSTANT;
118 check if it's a null unix time
120 _PUBLIC_ BOOL null_time(time_t t)
123 t == (time_t)0xFFFFFFFF ||
129 check if it's a null NTTIME
131 _PUBLIC_ BOOL null_nttime(NTTIME t)
133 return t == 0 || t == (NTTIME)-1;
136 /*******************************************************************
137 create a 16 bit dos packed date
138 ********************************************************************/
139 static uint16_t make_dos_date1(struct tm *t)
142 ret = (((unsigned int)(t->tm_mon+1)) >> 3) | ((t->tm_year-80) << 1);
143 ret = ((ret&0xFF)<<8) | (t->tm_mday | (((t->tm_mon+1) & 0x7) << 5));
147 /*******************************************************************
148 create a 16 bit dos packed time
149 ********************************************************************/
150 static uint16_t make_dos_time1(struct tm *t)
153 ret = ((((unsigned int)t->tm_min >> 3)&0x7) | (((unsigned int)t->tm_hour) << 3));
154 ret = ((ret&0xFF)<<8) | ((t->tm_sec/2) | ((t->tm_min & 0x7) << 5));
158 /*******************************************************************
159 create a 32 bit dos packed date/time from some parameters
160 This takes a GMT time and returns a packed localtime structure
161 ********************************************************************/
162 static uint32_t make_dos_date(time_t unixdate, int zone_offset)
171 unixdate -= zone_offset;
173 t = gmtime(&unixdate);
178 ret = make_dos_date1(t);
179 ret = ((ret&0xFFFF)<<16) | make_dos_time1(t);
185 put a dos date into a buffer (time/date format)
186 This takes GMT time and puts local time in the buffer
188 _PUBLIC_ void push_dos_date(uint8_t *buf, int offset, time_t unixdate, int zone_offset)
190 uint32_t x = make_dos_date(unixdate, zone_offset);
195 put a dos date into a buffer (date/time format)
196 This takes GMT time and puts local time in the buffer
198 _PUBLIC_ void push_dos_date2(uint8_t *buf,int offset,time_t unixdate, int zone_offset)
201 x = make_dos_date(unixdate, zone_offset);
202 x = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
207 put a dos 32 bit "unix like" date into a buffer. This routine takes
208 GMT and converts it to LOCAL time before putting it (most SMBs assume
209 localtime for this sort of date)
211 _PUBLIC_ void push_dos_date3(uint8_t *buf,int offset,time_t unixdate, int zone_offset)
213 if (!null_time(unixdate)) {
214 unixdate -= zone_offset;
216 SIVAL(buf,offset,unixdate);
219 /*******************************************************************
220 interpret a 32 bit dos packed date/time to some parameters
221 ********************************************************************/
222 static void interpret_dos_date(uint32_t date,int *year,int *month,int *day,int *hour,int *minute,int *second)
224 uint32_t p0,p1,p2,p3;
226 p0=date&0xFF; p1=((date&0xFF00)>>8)&0xFF;
227 p2=((date&0xFF0000)>>16)&0xFF; p3=((date&0xFF000000)>>24)&0xFF;
229 *second = 2*(p0 & 0x1F);
230 *minute = ((p0>>5)&0xFF) + ((p1&0x7)<<3);
231 *hour = (p1>>3)&0xFF;
233 *month = ((p2>>5)&0xFF) + ((p3&0x1)<<3) - 1;
234 *year = ((p3>>1)&0xFF) + 80;
238 create a unix date (int GMT) from a dos date (which is actually in
241 _PUBLIC_ time_t pull_dos_date(const uint8_t *date_ptr, int zone_offset)
247 dos_date = IVAL(date_ptr,0);
249 if (dos_date == 0) return (time_t)0;
251 interpret_dos_date(dos_date,&t.tm_year,&t.tm_mon,
252 &t.tm_mday,&t.tm_hour,&t.tm_min,&t.tm_sec);
263 like make_unix_date() but the words are reversed
265 _PUBLIC_ time_t pull_dos_date2(const uint8_t *date_ptr, int zone_offset)
269 x = IVAL(date_ptr,0);
270 x2 = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
273 return pull_dos_date((void *)&x, zone_offset);
277 create a unix GMT date from a dos date in 32 bit "unix like" format
278 these generally arrive as localtimes, with corresponding DST
280 _PUBLIC_ time_t pull_dos_date3(const uint8_t *date_ptr, int zone_offset)
282 time_t t = (time_t)IVAL(date_ptr,0);
291 return a HTTP/1.0 time string
293 _PUBLIC_ char *http_timestring(TALLOC_CTX *mem_ctx, time_t t)
297 struct tm *tm = localtime(&t);
300 return talloc_asprintf(mem_ctx,"%ld seconds since the Epoch",(long)t);
303 #ifndef HAVE_STRFTIME
304 buf = talloc_strdup(mem_ctx, asctime(tm));
305 if (buf[strlen(buf)-1] == '\n') {
306 buf[strlen(buf)-1] = 0;
309 strftime(tempTime, sizeof(tempTime)-1, "%a, %d %b %Y %H:%M:%S %Z", tm);
310 buf = talloc_strdup(mem_ctx, tempTime);
311 #endif /* !HAVE_STRFTIME */
317 Return the date and time as a string
319 _PUBLIC_ char *timestring(TALLOC_CTX *mem_ctx, time_t t)
327 return talloc_asprintf(mem_ctx,
328 "%ld seconds since the Epoch",
333 /* some versions of gcc complain about using %c. This is a bug
334 in the gcc warning, not a bug in this code. See a recent
335 strftime() manual page for details.
337 strftime(tempTime,sizeof(tempTime)-1,"%c %Z",tm);
338 TimeBuf = talloc_strdup(mem_ctx, tempTime);
340 TimeBuf = talloc_strdup(mem_ctx, asctime(tm));
347 return a talloced string representing a NTTIME for human consumption
349 _PUBLIC_ const char *nt_time_string(TALLOC_CTX *mem_ctx, NTTIME nt)
355 t = nt_time_to_unix(nt);
356 return timestring(mem_ctx, t);
361 put a NTTIME into a packet
363 _PUBLIC_ void push_nttime(uint8_t *base, uint16_t offset, NTTIME t)
365 SBVAL(base, offset, t);
369 pull a NTTIME from a packet
371 _PUBLIC_ NTTIME pull_nttime(uint8_t *base, uint16_t offset)
373 NTTIME ret = BVAL(base, offset);
378 parse a nttime as a large integer in a string and return a NTTIME
380 _PUBLIC_ NTTIME nttime_from_string(const char *s)
382 return strtoull(s, NULL, 0);
386 return (tv1 - tv2) in microseconds
388 _PUBLIC_ int64_t usec_time_diff(struct timeval *tv1, struct timeval *tv2)
390 int64_t sec_diff = tv1->tv_sec - tv2->tv_sec;
391 return (sec_diff * 1000000) + (int64_t)(tv1->tv_usec - tv2->tv_usec);
396 return a zero timeval
398 _PUBLIC_ struct timeval timeval_zero(void)
407 return True if a timeval is zero
409 _PUBLIC_ BOOL timeval_is_zero(const struct timeval *tv)
411 return tv->tv_sec == 0 && tv->tv_usec == 0;
415 return a timeval for the current time
417 _PUBLIC_ struct timeval timeval_current(void)
425 return a timeval struct with the given elements
427 _PUBLIC_ struct timeval timeval_set(uint32_t secs, uint32_t usecs)
437 return a timeval ofs microseconds after tv
439 _PUBLIC_ struct timeval timeval_add(const struct timeval *tv,
440 uint32_t secs, uint32_t usecs)
442 struct timeval tv2 = *tv;
443 const unsigned int million = 1000000;
445 tv2.tv_usec += usecs;
446 tv2.tv_sec += tv2.tv_usec / million;
447 tv2.tv_usec = tv2.tv_usec % million;
452 return the sum of two timeval structures
454 struct timeval timeval_sum(const struct timeval *tv1,
455 const struct timeval *tv2)
457 return timeval_add(tv1, tv2->tv_sec, tv2->tv_usec);
461 return a timeval secs/usecs into the future
463 _PUBLIC_ struct timeval timeval_current_ofs(uint32_t secs, uint32_t usecs)
465 struct timeval tv = timeval_current();
466 return timeval_add(&tv, secs, usecs);
470 compare two timeval structures.
471 Return -1 if tv1 < tv2
472 Return 0 if tv1 == tv2
473 Return 1 if tv1 > tv2
475 _PUBLIC_ int timeval_compare(const struct timeval *tv1, const struct timeval *tv2)
477 if (tv1->tv_sec > tv2->tv_sec) return 1;
478 if (tv1->tv_sec < tv2->tv_sec) return -1;
479 if (tv1->tv_usec > tv2->tv_usec) return 1;
480 if (tv1->tv_usec < tv2->tv_usec) return -1;
485 return True if a timer is in the past
487 _PUBLIC_ BOOL timeval_expired(const struct timeval *tv)
489 struct timeval tv2 = timeval_current();
490 if (tv2.tv_sec > tv->tv_sec) return True;
491 if (tv2.tv_sec < tv->tv_sec) return False;
492 return (tv2.tv_usec >= tv->tv_usec);
496 return the number of seconds elapsed between two times
498 _PUBLIC_ double timeval_elapsed2(const struct timeval *tv1, const struct timeval *tv2)
500 return (tv2->tv_sec - tv1->tv_sec) +
501 (tv2->tv_usec - tv1->tv_usec)*1.0e-6;
505 return the number of seconds elapsed since a given time
507 _PUBLIC_ double timeval_elapsed(const struct timeval *tv)
509 struct timeval tv2 = timeval_current();
510 return timeval_elapsed2(tv, &tv2);
514 return the lesser of two timevals
516 _PUBLIC_ struct timeval timeval_min(const struct timeval *tv1,
517 const struct timeval *tv2)
519 if (tv1->tv_sec < tv2->tv_sec) return *tv1;
520 if (tv1->tv_sec > tv2->tv_sec) return *tv2;
521 if (tv1->tv_usec < tv2->tv_usec) return *tv1;
526 return the greater of two timevals
528 _PUBLIC_ struct timeval timeval_max(const struct timeval *tv1,
529 const struct timeval *tv2)
531 if (tv1->tv_sec > tv2->tv_sec) return *tv1;
532 if (tv1->tv_sec < tv2->tv_sec) return *tv2;
533 if (tv1->tv_usec > tv2->tv_usec) return *tv1;
538 return the difference between two timevals as a timeval
539 if tv1 comes after tv2, then return a zero timeval
540 (this is *tv2 - *tv1)
542 _PUBLIC_ struct timeval timeval_until(const struct timeval *tv1,
543 const struct timeval *tv2)
546 if (timeval_compare(tv1, tv2) >= 0) {
547 return timeval_zero();
549 t.tv_sec = tv2->tv_sec - tv1->tv_sec;
550 if (tv1->tv_usec > tv2->tv_usec) {
552 t.tv_usec = 1000000 - (tv1->tv_usec - tv2->tv_usec);
554 t.tv_usec = tv2->tv_usec - tv1->tv_usec;
561 convert a timeval to a NTTIME
563 _PUBLIC_ NTTIME timeval_to_nttime(const struct timeval *tv)
565 return 10*(tv->tv_usec +
566 ((TIME_FIXUP_CONSTANT + (uint64_t)tv->tv_sec) * 1000000));
569 /*******************************************************************
570 yield the difference between *A and *B, in seconds, ignoring leap seconds
571 ********************************************************************/
572 static int tm_diff(struct tm *a, struct tm *b)
574 int ay = a->tm_year + (1900 - 1);
575 int by = b->tm_year + (1900 - 1);
576 int intervening_leap_days =
577 (ay/4 - by/4) - (ay/100 - by/100) + (ay/400 - by/400);
579 int days = 365*years + intervening_leap_days + (a->tm_yday - b->tm_yday);
580 int hours = 24*days + (a->tm_hour - b->tm_hour);
581 int minutes = 60*hours + (a->tm_min - b->tm_min);
582 int seconds = 60*minutes + (a->tm_sec - b->tm_sec);
588 return the UTC offset in seconds west of UTC, or 0 if it cannot be determined
590 _PUBLIC_ int get_time_zone(time_t t)
592 struct tm *tm = gmtime(&t);
600 return tm_diff(&tm_utc,tm);