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Diffstat (limited to 'source/lib/time.c')
| -rw-r--r-- | source/lib/time.c | 495 |
1 files changed, 0 insertions, 495 deletions
diff --git a/source/lib/time.c b/source/lib/time.c deleted file mode 100644 index d16552b61e2..00000000000 --- a/source/lib/time.c +++ /dev/null @@ -1,495 +0,0 @@ -/* - Unix SMB/Netbios implementation. - Version 1.9. - time handling functions - Copyright (C) Andrew Tridgell 1992-1997 - - 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 02139, 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 -#define TIME_T_MIN ((time_t)0 < (time_t) -1 ? (time_t) 0 \ - : ~ (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); - 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; - - high = t + MAX_DST_WIDTH/2; - if (high < t) - high = TIME_T_MAX; - - /* 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 */ - t -= TimeDiff(t) - serverzone; - - 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 -****************************************************************************/ -static BOOL null_mtime(time_t mtime) -{ - 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); -} - -/**************************************************************************** -set the time on a file -****************************************************************************/ -BOOL set_filetime(char *fname,time_t mtime) -{ - struct utimbuf times; - - if (null_mtime(mtime)) return(True); - - times.modtime = times.actime = mtime; - - if (sys_utime(fname,×)) { - DEBUG(4,("set_filetime(%s) failed: %s\n",fname,strerror(errno))); - } - - return(True); -} - - -/**************************************************************************** - return the date and time as a string -****************************************************************************/ -char *timestring(void ) -{ - static char TimeBuf[100]; - time_t t = time(NULL); - struct tm *tm = LocalTime(&t); - -#ifdef NO_STRFTIME - strcpy(TimeBuf, asctime(tm)); -#elif defined(CLIX) || defined(CONVEX) - strftime(TimeBuf,100,"%m/%d/%y %I:%M:%S %p",tm); -#elif defined(AMPM) - strftime(TimeBuf,100,"%D %r",tm); -#elif defined(TZ_TIME) - { - int zone = TimeDiff(t); - int absZoneMinutes = (zone<0 ? -zone : zone) / 60; - size_t len = strftime(TimeBuf,sizeof(TimeBuf)-6,"%D %T",tm); - sprintf(TimeBuf+len," %c%02d%02d", - zone<0?'+':'-',absZoneMinutes/60,absZoneMinutes%60); - } -#else - strftime(TimeBuf,100,"%D %T",tm); -#endif - return(TimeBuf); -} - |