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/*
Unix SMB / Netbios implementation .
Version 1.9 .
time handling functions
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Copyright ( C ) Andrew Tridgell 1992 - 1997
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This program is free software ; you can redistribute it and / or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation ; either version 2 of the License , or
( at your option ) any later version .
This program is distributed in the hope that it will be useful ,
but WITHOUT ANY WARRANTY ; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE . See the
GNU General Public License for more details .
You should have received a copy of the GNU General Public License
along with this program ; if not , write to the Free Software
Foundation , Inc . , 675 Mass Ave , Cambridge , MA 0213 9 , USA .
*/
# include "includes.h"
/*
This stuff was largely rewritten by Paul Eggert < eggert @ twinsun . com >
in May 1996
*/
int serverzone = 0 ;
int extra_time_offset = 0 ;
extern int DEBUGLEVEL ;
# ifndef CHAR_BIT
# define CHAR_BIT 8
# endif
# ifndef TIME_T_MIN
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# define TIME_T_MIN ((time_t)0 < (time_t) -1 ? (time_t) 0 \
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: ~ ( time_t ) 0 < < ( sizeof ( time_t ) * CHAR_BIT - 1 ) )
# endif
# ifndef TIME_T_MAX
# define TIME_T_MAX (~ (time_t) 0 - TIME_T_MIN)
# endif
/*******************************************************************
a gettimeofday wrapper
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
void GetTimeOfDay ( struct timeval * tval )
{
# ifdef GETTIMEOFDAY1
gettimeofday ( tval ) ;
# else
gettimeofday ( tval , NULL ) ;
# endif
}
# define TM_YEAR_BASE 1900
/*******************************************************************
yield the difference between * A and * B , in seconds , ignoring leap seconds
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
static int tm_diff ( struct tm * a , struct tm * b )
{
int ay = a - > tm_year + ( TM_YEAR_BASE - 1 ) ;
int by = b - > tm_year + ( TM_YEAR_BASE - 1 ) ;
int intervening_leap_days =
( ay / 4 - by / 4 ) - ( ay / 100 - by / 100 ) + ( ay / 400 - by / 400 ) ;
int years = ay - by ;
int days = 365 * years + intervening_leap_days + ( a - > tm_yday - b - > tm_yday ) ;
int hours = 24 * days + ( a - > tm_hour - b - > tm_hour ) ;
int minutes = 60 * hours + ( a - > tm_min - b - > tm_min ) ;
int seconds = 60 * minutes + ( a - > tm_sec - b - > tm_sec ) ;
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return seconds ;
}
/*******************************************************************
return the UTC offset in seconds west of UTC
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
static int TimeZone ( time_t t )
{
struct tm tm_utc = * ( gmtime ( & t ) ) ;
return tm_diff ( & tm_utc , localtime ( & t ) ) ;
}
/*******************************************************************
init the time differences
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
void TimeInit ( void )
{
serverzone = TimeZone ( time ( NULL ) ) ;
DEBUG ( 4 , ( " Serverzone is %d \n " , serverzone ) ) ;
}
/*******************************************************************
return the same value as TimeZone , but it should be more efficient .
We keep a table of DST offsets to prevent calling localtime ( ) on each
call of this function . This saves a LOT of time on many unixes .
Updated by Paul Eggert < eggert @ twinsun . com >
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
static int TimeZoneFaster ( time_t t )
{
static struct dst_table { time_t start , end ; int zone ; } * dst_table = NULL ;
static int table_size = 0 ;
int i ;
int zone = 0 ;
if ( t = = 0 ) t = time ( NULL ) ;
/* Tunis has a 8 day DST region, we need to be careful ... */
# define MAX_DST_WIDTH (365*24*60*60)
# define MAX_DST_SKIP (7*24*60*60)
for ( i = 0 ; i < table_size ; i + + )
if ( t > = dst_table [ i ] . start & & t < = dst_table [ i ] . end ) break ;
if ( i < table_size ) {
zone = dst_table [ i ] . zone ;
} else {
time_t low , high ;
zone = TimeZone ( t ) ;
dst_table = ( struct dst_table * ) Realloc ( dst_table ,
sizeof ( dst_table [ 0 ] ) * ( i + 1 ) ) ;
if ( ! dst_table ) {
table_size = 0 ;
} else {
table_size + + ;
dst_table [ i ] . zone = zone ;
dst_table [ i ] . start = dst_table [ i ] . end = t ;
/* no entry will cover more than 6 months */
low = t - MAX_DST_WIDTH / 2 ;
if ( t < low )
low = TIME_T_MIN ;
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high = t + MAX_DST_WIDTH / 2 ;
if ( high < t )
high = TIME_T_MAX ;
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/* widen the new entry using two bisection searches */
while ( low + 60 * 60 < dst_table [ i ] . start ) {
if ( dst_table [ i ] . start - low > MAX_DST_SKIP * 2 )
t = dst_table [ i ] . start - MAX_DST_SKIP ;
else
t = low + ( dst_table [ i ] . start - low ) / 2 ;
if ( TimeZone ( t ) = = zone )
dst_table [ i ] . start = t ;
else
low = t ;
}
while ( high - 60 * 60 > dst_table [ i ] . end ) {
if ( high - dst_table [ i ] . end > MAX_DST_SKIP * 2 )
t = dst_table [ i ] . end + MAX_DST_SKIP ;
else
t = high - ( high - dst_table [ i ] . end ) / 2 ;
if ( TimeZone ( t ) = = zone )
dst_table [ i ] . end = t ;
else
high = t ;
}
#if 0
DEBUG ( 1 , ( " Added DST entry from %s " ,
asctime ( localtime ( & dst_table [ i ] . start ) ) ) ) ;
DEBUG ( 1 , ( " to %s (%d) \n " , asctime ( localtime ( & dst_table [ i ] . end ) ) ,
dst_table [ i ] . zone ) ) ;
# endif
}
}
return zone ;
}
/****************************************************************************
return the UTC offset in seconds west of UTC , adjusted for extra time offset
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
int TimeDiff ( time_t t )
{
return TimeZoneFaster ( t ) + 60 * extra_time_offset ;
}
/****************************************************************************
return the UTC offset in seconds west of UTC , adjusted for extra time
offset , for a local time value . If ut = lt + LocTimeDiff ( lt ) , then
lt = ut - TimeDiff ( ut ) , but the converse does not necessarily hold near
daylight savings transitions because some local times are ambiguous .
LocTimeDiff ( t ) equals TimeDiff ( t ) except near daylight savings transitions .
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
static int LocTimeDiff ( time_t lte )
{
time_t lt = lte - 60 * extra_time_offset ;
int d = TimeZoneFaster ( lt ) ;
time_t t = lt + d ;
/* if overflow occurred, ignore all the adjustments so far */
if ( ( ( lte < lt ) ^ ( extra_time_offset < 0 ) ) | ( ( t < lt ) ^ ( d < 0 ) ) )
t = lte ;
/* now t should be close enough to the true UTC to yield the right answer */
return TimeDiff ( t ) ;
}
/****************************************************************************
try to optimise the localtime call , it can be quite expenive on some machines
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
struct tm * LocalTime ( time_t * t )
{
time_t t2 = * t ;
t2 - = TimeDiff ( t2 ) ;
return ( gmtime ( & t2 ) ) ;
}
# define TIME_FIXUP_CONSTANT (369.0*365.25*24*60*60-(3.0*24*60*60+6.0*60*60))
/****************************************************************************
interpret an 8 byte " filetime " structure to a time_t
It ' s originally in " 100ns units since jan 1st 1601 "
It appears to be kludge - GMT ( at least for file listings ) . This means
its the GMT you get by taking a localtime and adding the
serverzone . This is NOT the same as GMT in some cases . This routine
converts this to real GMT .
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
time_t interpret_long_date ( char * p )
{
double d ;
time_t ret ;
uint32 tlow , thigh ;
tlow = IVAL ( p , 0 ) ;
thigh = IVAL ( p , 4 ) ;
if ( thigh = = 0 ) return ( 0 ) ;
d = ( ( double ) thigh ) * 4.0 * ( double ) ( 1 < < 30 ) ;
d + = ( tlow & 0xFFF00000 ) ;
d * = 1.0e-7 ;
/* now adjust by 369 years to make the secs since 1970 */
d - = TIME_FIXUP_CONSTANT ;
if ( ! ( TIME_T_MIN < = d & & d < = TIME_T_MAX ) )
return ( 0 ) ;
ret = ( time_t ) ( d + 0.5 ) ;
/* this takes us from kludge-GMT to real GMT */
ret - = serverzone ;
ret + = LocTimeDiff ( ret ) ;
return ( ret ) ;
}
/****************************************************************************
put a 8 byte filetime from a time_t
This takes real GMT as input and converts to kludge - GMT
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
void put_long_date ( char * p , time_t t )
{
uint32 tlow , thigh ;
double d ;
if ( t = = 0 ) {
SIVAL ( p , 0 , 0 ) ; SIVAL ( p , 4 , 0 ) ;
return ;
}
/* this converts GMT to kludge-GMT */
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t - = LocTimeDiff ( t ) - serverzone ;
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d = ( double ) ( t ) ;
d + = TIME_FIXUP_CONSTANT ;
d * = 1.0e7 ;
thigh = ( uint32 ) ( d * ( 1.0 / ( 4.0 * ( double ) ( 1 < < 30 ) ) ) ) ;
tlow = ( uint32 ) ( d - ( ( double ) thigh ) * 4.0 * ( double ) ( 1 < < 30 ) ) ;
SIVAL ( p , 0 , tlow ) ;
SIVAL ( p , 4 , thigh ) ;
}
/****************************************************************************
check if it ' s a null mtime
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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BOOL null_mtime ( time_t mtime )
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{
if ( mtime = = 0 | | mtime = = 0xFFFFFFFF | | mtime = = ( time_t ) - 1 )
return ( True ) ;
return ( False ) ;
}
/*******************************************************************
create a 16 bit dos packed date
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
static uint16 make_dos_date1 ( time_t unixdate , struct tm * t )
{
uint16 ret = 0 ;
ret = ( ( ( unsigned ) ( t - > tm_mon + 1 ) ) > > 3 ) | ( ( t - > tm_year - 80 ) < < 1 ) ;
ret = ( ( ret & 0xFF ) < < 8 ) | ( t - > tm_mday | ( ( ( t - > tm_mon + 1 ) & 0x7 ) < < 5 ) ) ;
return ( ret ) ;
}
/*******************************************************************
create a 16 bit dos packed time
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
static uint16 make_dos_time1 ( time_t unixdate , struct tm * t )
{
uint16 ret = 0 ;
ret = ( ( ( ( unsigned ) t - > tm_min > > 3 ) & 0x7 ) | ( ( ( unsigned ) t - > tm_hour ) < < 3 ) ) ;
ret = ( ( ret & 0xFF ) < < 8 ) | ( ( t - > tm_sec / 2 ) | ( ( t - > tm_min & 0x7 ) < < 5 ) ) ;
return ( ret ) ;
}
/*******************************************************************
create a 32 bit dos packed date / time from some parameters
This takes a GMT time and returns a packed localtime structure
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
static uint32 make_dos_date ( time_t unixdate )
{
struct tm * t ;
uint32 ret = 0 ;
t = LocalTime ( & unixdate ) ;
ret = make_dos_date1 ( unixdate , t ) ;
ret = ( ( ret & 0xFFFF ) < < 16 ) | make_dos_time1 ( unixdate , t ) ;
return ( ret ) ;
}
/*******************************************************************
put a dos date into a buffer ( time / date format )
This takes GMT time and puts local time in the buffer
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
void put_dos_date ( char * buf , int offset , time_t unixdate )
{
uint32 x = make_dos_date ( unixdate ) ;
SIVAL ( buf , offset , x ) ;
}
/*******************************************************************
put a dos date into a buffer ( date / time format )
This takes GMT time and puts local time in the buffer
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
void put_dos_date2 ( char * buf , int offset , time_t unixdate )
{
uint32 x = make_dos_date ( unixdate ) ;
x = ( ( x & 0xFFFF ) < < 16 ) | ( ( x & 0xFFFF0000 ) > > 16 ) ;
SIVAL ( buf , offset , x ) ;
}
/*******************************************************************
put a dos 32 bit " unix like " date into a buffer . This routine takes
GMT and converts it to LOCAL time before putting it ( most SMBs assume
localtime for this sort of date )
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
void put_dos_date3 ( char * buf , int offset , time_t unixdate )
{
if ( ! null_mtime ( unixdate ) )
unixdate - = TimeDiff ( unixdate ) ;
SIVAL ( buf , offset , unixdate ) ;
}
/*******************************************************************
interpret a 32 bit dos packed date / time to some parameters
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
static void interpret_dos_date ( uint32 date , int * year , int * month , int * day , int * hour , int * minute , int * second )
{
uint32 p0 , p1 , p2 , p3 ;
p0 = date & 0xFF ; p1 = ( ( date & 0xFF00 ) > > 8 ) & 0xFF ;
p2 = ( ( date & 0xFF0000 ) > > 16 ) & 0xFF ; p3 = ( ( date & 0xFF000000 ) > > 24 ) & 0xFF ;
* second = 2 * ( p0 & 0x1F ) ;
* minute = ( ( p0 > > 5 ) & 0xFF ) + ( ( p1 & 0x7 ) < < 3 ) ;
* hour = ( p1 > > 3 ) & 0xFF ;
* day = ( p2 & 0x1F ) ;
* month = ( ( p2 > > 5 ) & 0xFF ) + ( ( p3 & 0x1 ) < < 3 ) - 1 ;
* year = ( ( p3 > > 1 ) & 0xFF ) + 80 ;
}
/*******************************************************************
create a unix date ( int GMT ) from a dos date ( which is actually in
localtime )
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
time_t make_unix_date ( void * date_ptr )
{
uint32 dos_date = 0 ;
struct tm t ;
time_t ret ;
dos_date = IVAL ( date_ptr , 0 ) ;
if ( dos_date = = 0 ) return ( 0 ) ;
interpret_dos_date ( dos_date , & t . tm_year , & t . tm_mon ,
& t . tm_mday , & t . tm_hour , & t . tm_min , & t . tm_sec ) ;
t . tm_isdst = - 1 ;
/* mktime() also does the local to GMT time conversion for us */
ret = mktime ( & t ) ;
return ( ret ) ;
}
/*******************************************************************
like make_unix_date ( ) but the words are reversed
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
time_t make_unix_date2 ( void * date_ptr )
{
uint32 x , x2 ;
x = IVAL ( date_ptr , 0 ) ;
x2 = ( ( x & 0xFFFF ) < < 16 ) | ( ( x & 0xFFFF0000 ) > > 16 ) ;
SIVAL ( & x , 0 , x2 ) ;
return ( make_unix_date ( ( void * ) & x ) ) ;
}
/*******************************************************************
create a unix GMT date from a dos date in 32 bit " unix like " format
these generally arrive as localtimes , with corresponding DST
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
time_t make_unix_date3 ( void * date_ptr )
{
time_t t = IVAL ( date_ptr , 0 ) ;
if ( ! null_mtime ( t ) )
t + = LocTimeDiff ( t ) ;
return ( t ) ;
}
/****************************************************************************
return the date and time as a string
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
char * timestring ( void )
{
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static fstring TimeBuf ;
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time_t t = time ( NULL ) ;
struct tm * tm = LocalTime ( & t ) ;
# ifdef NO_STRFTIME
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fstrcpy ( TimeBuf , asctime ( tm ) ) ;
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# elif defined(CLIX) || defined(CONVEX)
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strftime ( TimeBuf , 100 , " %m/%d/%Y %I:%M:%S %p " , tm ) ;
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# elif defined(AMPM)
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strftime ( TimeBuf , 100 , " %m/%d/%Y %r " , tm ) ;
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# elif defined(TZ_TIME)
{
int zone = TimeDiff ( t ) ;
int absZoneMinutes = ( zone < 0 ? - zone : zone ) / 60 ;
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size_t len = strftime ( TimeBuf , sizeof ( TimeBuf ) - 6 , " %m/%d/%Y %T " , tm ) ;
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sprintf ( TimeBuf + len , " %c%02d%02d " ,
zone < 0 ? ' + ' : ' - ' , absZoneMinutes / 60 , absZoneMinutes % 60 ) ;
}
# else
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strftime ( TimeBuf , 100 , " %m/%d/%Y %T " , tm ) ;
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# endif
return ( TimeBuf ) ;
}
