2 Unix SMB/Netbios implementation.
4 time handling functions
5 Copyright (C) Andrew Tridgell 1992-1998
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
25 This stuff was largely rewritten by Paul Eggert <eggert@twinsun.com>
31 int extra_time_offset
= 0;
33 extern int DEBUGLEVEL
;
40 #define TIME_T_MIN ((time_t)0 < (time_t) -1 ? (time_t) 0 \
41 : ~ (time_t) 0 << (sizeof (time_t) * CHAR_BIT - 1))
44 #define TIME_T_MAX (~ (time_t) 0 - TIME_T_MIN)
49 /*******************************************************************
50 a gettimeofday wrapper
51 ********************************************************************/
52 void GetTimeOfDay(struct timeval
*tval
)
54 #ifdef HAVE_GETTIMEOFDAY_TZ
55 gettimeofday(tval
,NULL
);
61 #define TM_YEAR_BASE 1900
63 /*******************************************************************
64 yield the difference between *A and *B, in seconds, ignoring leap seconds
65 ********************************************************************/
66 static int tm_diff(struct tm
*a
, struct tm
*b
)
68 int ay
= a
->tm_year
+ (TM_YEAR_BASE
- 1);
69 int by
= b
->tm_year
+ (TM_YEAR_BASE
- 1);
70 int intervening_leap_days
=
71 (ay
/4 - by
/4) - (ay
/100 - by
/100) + (ay
/400 - by
/400);
73 int days
= 365*years
+ intervening_leap_days
+ (a
->tm_yday
- b
->tm_yday
);
74 int hours
= 24*days
+ (a
->tm_hour
- b
->tm_hour
);
75 int minutes
= 60*hours
+ (a
->tm_min
- b
->tm_min
);
76 int seconds
= 60*minutes
+ (a
->tm_sec
- b
->tm_sec
);
81 /*******************************************************************
82 return the UTC offset in seconds west of UTC, or 0 if it cannot be determined
83 ******************************************************************/
84 static int TimeZone(time_t t
)
86 struct tm
*tm
= gmtime(&t
);
94 return tm_diff(&tm_utc
,tm
);
99 /*******************************************************************
100 init the time differences
101 ********************************************************************/
104 serverzone
= TimeZone(time(NULL
));
106 if ((serverzone
% 60) != 0) {
107 DEBUG(1,("WARNING: Your timezone is not a multiple of 1 minute.\n"));
110 DEBUG(4,("Serverzone is %d\n",serverzone
));
114 /*******************************************************************
115 return the same value as TimeZone, but it should be more efficient.
117 We keep a table of DST offsets to prevent calling localtime() on each
118 call of this function. This saves a LOT of time on many unixes.
120 Updated by Paul Eggert <eggert@twinsun.com>
121 ********************************************************************/
122 static int TimeZoneFaster(time_t t
)
124 static struct dst_table
{time_t start
,end
; int zone
;} *dst_table
= NULL
;
125 static int table_size
= 0;
129 if (t
== 0) t
= time(NULL
);
131 /* Tunis has a 8 day DST region, we need to be careful ... */
132 #define MAX_DST_WIDTH (365*24*60*60)
133 #define MAX_DST_SKIP (7*24*60*60)
135 for (i
=0;i
<table_size
;i
++)
136 if (t
>= dst_table
[i
].start
&& t
<= dst_table
[i
].end
) break;
139 zone
= dst_table
[i
].zone
;
144 dst_table
= (struct dst_table
*)Realloc(dst_table
,
145 sizeof(dst_table
[0])*(i
+1));
151 dst_table
[i
].zone
= zone
;
152 dst_table
[i
].start
= dst_table
[i
].end
= t
;
154 /* no entry will cover more than 6 months */
155 low
= t
- MAX_DST_WIDTH
/2;
159 high
= t
+ MAX_DST_WIDTH
/2;
163 /* widen the new entry using two bisection searches */
164 while (low
+60*60 < dst_table
[i
].start
) {
165 if (dst_table
[i
].start
- low
> MAX_DST_SKIP
*2)
166 t
= dst_table
[i
].start
- MAX_DST_SKIP
;
168 t
= low
+ (dst_table
[i
].start
-low
)/2;
169 if (TimeZone(t
) == zone
)
170 dst_table
[i
].start
= t
;
175 while (high
-60*60 > dst_table
[i
].end
) {
176 if (high
- dst_table
[i
].end
> MAX_DST_SKIP
*2)
177 t
= dst_table
[i
].end
+ MAX_DST_SKIP
;
179 t
= high
- (high
-dst_table
[i
].end
)/2;
180 if (TimeZone(t
) == zone
)
181 dst_table
[i
].end
= t
;
186 DEBUG(1,("Added DST entry from %s ",
187 asctime(localtime(&dst_table
[i
].start
))));
188 DEBUG(1,("to %s (%d)\n",asctime(localtime(&dst_table
[i
].end
)),
196 /****************************************************************************
197 return the UTC offset in seconds west of UTC, adjusted for extra time offset
198 **************************************************************************/
199 int TimeDiff(time_t t
)
201 return TimeZoneFaster(t
) + 60*extra_time_offset
;
205 /****************************************************************************
206 return the UTC offset in seconds west of UTC, adjusted for extra time
207 offset, for a local time value. If ut = lt + LocTimeDiff(lt), then
208 lt = ut - TimeDiff(ut), but the converse does not necessarily hold near
209 daylight savings transitions because some local times are ambiguous.
210 LocTimeDiff(t) equals TimeDiff(t) except near daylight savings transitions.
211 +**************************************************************************/
212 static int LocTimeDiff(time_t lte
)
214 time_t lt
= lte
- 60*extra_time_offset
;
215 int d
= TimeZoneFaster(lt
);
218 /* if overflow occurred, ignore all the adjustments so far */
219 if (((lte
< lt
) ^ (extra_time_offset
< 0)) | ((t
< lt
) ^ (d
< 0)))
222 /* now t should be close enough to the true UTC to yield the right answer */
227 /****************************************************************************
228 try to optimise the localtime call, it can be quite expensive on some machines
229 ****************************************************************************/
230 struct tm
*LocalTime(time_t *t
)
239 #define TIME_FIXUP_CONSTANT (369.0*365.25*24*60*60-(3.0*24*60*60+6.0*60*60))
241 /****************************************************************************
242 interpret an 8 byte "filetime" structure to a time_t
243 It's originally in "100ns units since jan 1st 1601"
245 It appears to be kludge-GMT (at least for file listings). This means
246 its the GMT you get by taking a localtime and adding the
247 serverzone. This is NOT the same as GMT in some cases. This routine
248 converts this to real GMT.
249 ****************************************************************************/
250 time_t nt_time_to_unix(NTTIME
*nt
)
254 /* The next two lines are a fix needed for the
255 broken SCO compiler. JRA. */
256 time_t l_time_min
= TIME_T_MIN
;
257 time_t l_time_max
= TIME_T_MAX
;
259 if (nt
->high
== 0) return(0);
261 d
= ((double)nt
->high
)*4.0*(double)(1<<30);
262 d
+= (nt
->low
&0xFFF00000);
265 /* now adjust by 369 years to make the secs since 1970 */
266 d
-= TIME_FIXUP_CONSTANT
;
268 if (!(l_time_min
<= d
&& d
<= l_time_max
))
271 ret
= (time_t)(d
+0.5);
273 /* this takes us from kludge-GMT to real GMT */
275 ret
+= LocTimeDiff(ret
);
282 /****************************************************************************
283 interprets an nt time into a unix time_t
284 ****************************************************************************/
285 time_t interpret_long_date(char *p
)
290 return nt_time_to_unix(&nt
);
293 /****************************************************************************
294 put a 8 byte filetime from a time_t
295 This takes real GMT as input and converts to kludge-GMT
296 ****************************************************************************/
297 void unix_to_nt_time(NTTIME
*nt
, time_t t
)
308 /* this converts GMT to kludge-GMT */
309 t
-= LocTimeDiff(t
) - serverzone
;
312 d
+= TIME_FIXUP_CONSTANT
;
315 nt
->high
= (uint32
)(d
* (1.0/(4.0*(double)(1<<30))));
316 nt
->low
= (uint32
)(d
- ((double)nt
->high
)*4.0*(double)(1<<30));
320 /****************************************************************************
321 take an NTTIME structure, containing high / low time. convert to unix time.
322 lkclXXXX this may need 2 SIVALs not a memcpy. we'll see...
323 ****************************************************************************/
324 void put_long_date(char *p
,time_t t
)
327 unix_to_nt_time(&nt
, t
);
329 SIVAL(p
, 4, nt
.high
);
332 /****************************************************************************
333 check if it's a null mtime
334 ****************************************************************************/
335 BOOL
null_mtime(time_t mtime
)
337 if (mtime
== (time_t)0 || mtime
== (time_t)0xFFFFFFFF || mtime
== (time_t)-1)
342 /*******************************************************************
343 create a 16 bit dos packed date
344 ********************************************************************/
345 static uint16
make_dos_date1(struct tm
*t
)
348 ret
= (((unsigned)(t
->tm_mon
+1)) >> 3) | ((t
->tm_year
-80) << 1);
349 ret
= ((ret
&0xFF)<<8) | (t
->tm_mday
| (((t
->tm_mon
+1) & 0x7) << 5));
353 /*******************************************************************
354 create a 16 bit dos packed time
355 ********************************************************************/
356 static uint16
make_dos_time1(struct tm
*t
)
359 ret
= ((((unsigned)t
->tm_min
>> 3)&0x7) | (((unsigned)t
->tm_hour
) << 3));
360 ret
= ((ret
&0xFF)<<8) | ((t
->tm_sec
/2) | ((t
->tm_min
& 0x7) << 5));
364 /*******************************************************************
365 create a 32 bit dos packed date/time from some parameters
366 This takes a GMT time and returns a packed localtime structure
367 ********************************************************************/
368 static uint32
make_dos_date(time_t unixdate
)
373 t
= LocalTime(&unixdate
);
377 ret
= make_dos_date1(t
);
378 ret
= ((ret
&0xFFFF)<<16) | make_dos_time1(t
);
383 /*******************************************************************
384 put a dos date into a buffer (time/date format)
385 This takes GMT time and puts local time in the buffer
386 ********************************************************************/
387 void put_dos_date(char *buf
,int offset
,time_t unixdate
)
389 uint32 x
= make_dos_date(unixdate
);
393 /*******************************************************************
394 put a dos date into a buffer (date/time format)
395 This takes GMT time and puts local time in the buffer
396 ********************************************************************/
397 void put_dos_date2(char *buf
,int offset
,time_t unixdate
)
399 uint32 x
= make_dos_date(unixdate
);
400 x
= ((x
&0xFFFF)<<16) | ((x
&0xFFFF0000)>>16);
404 /*******************************************************************
405 put a dos 32 bit "unix like" date into a buffer. This routine takes
406 GMT and converts it to LOCAL time before putting it (most SMBs assume
407 localtime for this sort of date)
408 ********************************************************************/
409 void put_dos_date3(char *buf
,int offset
,time_t unixdate
)
411 if (!null_mtime(unixdate
))
412 unixdate
-= TimeDiff(unixdate
);
413 SIVAL(buf
,offset
,unixdate
);
416 /*******************************************************************
417 interpret a 32 bit dos packed date/time to some parameters
418 ********************************************************************/
419 static void interpret_dos_date(uint32 date
,int *year
,int *month
,int *day
,int *hour
,int *minute
,int *second
)
423 p0
=date
&0xFF; p1
=((date
&0xFF00)>>8)&0xFF;
424 p2
=((date
&0xFF0000)>>16)&0xFF; p3
=((date
&0xFF000000)>>24)&0xFF;
426 *second
= 2*(p0
& 0x1F);
427 *minute
= ((p0
>>5)&0xFF) + ((p1
&0x7)<<3);
428 *hour
= (p1
>>3)&0xFF;
430 *month
= ((p2
>>5)&0xFF) + ((p3
&0x1)<<3) - 1;
431 *year
= ((p3
>>1)&0xFF) + 80;
434 /*******************************************************************
435 create a unix date (int GMT) from a dos date (which is actually in
437 ********************************************************************/
438 time_t make_unix_date(void *date_ptr
)
444 dos_date
= IVAL(date_ptr
,0);
446 if (dos_date
== 0) return(0);
448 interpret_dos_date(dos_date
,&t
.tm_year
,&t
.tm_mon
,
449 &t
.tm_mday
,&t
.tm_hour
,&t
.tm_min
,&t
.tm_sec
);
452 /* mktime() also does the local to GMT time conversion for us */
458 /*******************************************************************
459 like make_unix_date() but the words are reversed
460 ********************************************************************/
461 time_t make_unix_date2(void *date_ptr
)
465 x
= IVAL(date_ptr
,0);
466 x2
= ((x
&0xFFFF)<<16) | ((x
&0xFFFF0000)>>16);
469 return(make_unix_date((void *)&x
));
472 /*******************************************************************
473 create a unix GMT date from a dos date in 32 bit "unix like" format
474 these generally arrive as localtimes, with corresponding DST
475 ******************************************************************/
476 time_t make_unix_date3(void *date_ptr
)
478 time_t t
= (time_t)IVAL(date_ptr
,0);
485 /***************************************************************************
486 return a HTTP/1.0 time string
487 ***************************************************************************/
488 char *http_timestring(time_t t
)
491 struct tm
*tm
= LocalTime(&t
);
494 slprintf(buf
,sizeof(buf
)-1,"%ld seconds since the Epoch",(long)t
);
496 #ifndef HAVE_STRFTIME
497 fstrcpy(buf
, asctime(tm
));
498 #else /* !HAVE_STRFTIME */
499 strftime(buf
, sizeof(buf
)-1, "%a, %d %b %Y %H:%M:%S %Z", tm
);
500 #endif /* !HAVE_STRFTIME */
506 /****************************************************************************
507 return the date and time as a string
508 ****************************************************************************/
509 char *timestring(void )
511 static fstring TimeBuf
;
512 time_t t
= time(NULL
);
513 struct tm
*tm
= LocalTime(&t
);
516 slprintf(TimeBuf
,sizeof(TimeBuf
)-1,"%ld seconds since the Epoch",(long)t
);
519 strftime(TimeBuf
,100,"%Y/%m/%d %H:%M:%S",tm
);
521 fstrcpy(TimeBuf
, asctime(tm
));
527 /****************************************************************************
528 return the best approximation to a 'create time' under UNIX from a stat
530 ****************************************************************************/
532 time_t get_create_time(SMB_STRUCT_STAT
*st
,BOOL fake_dirs
)
536 if(S_ISDIR(st
->st_mode
) && fake_dirs
)
537 return (time_t)315493200L; /* 1/1/1980 */
539 ret
= MIN(st
->st_ctime
, st
->st_mtime
);
540 ret1
= MIN(ret
, st
->st_atime
);
542 if(ret1
!= (time_t)0)
546 * One of ctime, mtime or atime was zero (probably atime).
547 * Just return MIN(ctime, mtime).