mirror of
https://github.com/samba-team/samba.git
synced 2024-12-25 23:21:54 +03:00
7309f50062
this fixes a timestamp problem with 64 bit machines
(This used to be commit 0ce6eddad8
)
755 lines
21 KiB
C
755 lines
21 KiB
C
/*
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Unix SMB/CIFS implementation.
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time handling functions
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Copyright (C) Andrew Tridgell 1992-1998
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Copyright (C) Stefan (metze) Metzmacher 2002
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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/*
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This stuff was largely rewritten by Paul Eggert <eggert@twinsun.com>
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in May 1996
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*/
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int extra_time_offset = 0;
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#ifndef CHAR_BIT
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#define CHAR_BIT 8
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#endif
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#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))
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#endif
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#ifndef TIME_T_MAX
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#define TIME_T_MAX (~ (time_t) 0 - TIME_T_MIN)
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#endif
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void get_nttime_max(NTTIME *t)
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{
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/* FIXME: This is incorrect */
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unix_to_nt_time(t, get_time_t_max());
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}
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/*******************************************************************
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External access to time_t_min and time_t_max.
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********************************************************************/
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time_t get_time_t_max(void)
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{
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return TIME_T_MAX;
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}
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/*******************************************************************
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a gettimeofday wrapper
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********************************************************************/
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void GetTimeOfDay(struct timeval *tval)
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{
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#ifdef HAVE_GETTIMEOFDAY_TZ
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gettimeofday(tval,NULL);
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#else
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gettimeofday(tval);
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#endif
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}
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#define TM_YEAR_BASE 1900
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/*******************************************************************
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yield the difference between *A and *B, in seconds, ignoring leap seconds
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********************************************************************/
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static int tm_diff(struct tm *a, struct tm *b)
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{
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int ay = a->tm_year + (TM_YEAR_BASE - 1);
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int by = b->tm_year + (TM_YEAR_BASE - 1);
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int intervening_leap_days =
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(ay/4 - by/4) - (ay/100 - by/100) + (ay/400 - by/400);
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int years = ay - by;
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int days = 365*years + intervening_leap_days + (a->tm_yday - b->tm_yday);
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int hours = 24*days + (a->tm_hour - b->tm_hour);
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int minutes = 60*hours + (a->tm_min - b->tm_min);
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int seconds = 60*minutes + (a->tm_sec - b->tm_sec);
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return seconds;
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}
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/*******************************************************************
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return the UTC offset in seconds west of UTC, or 0 if it cannot be determined
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******************************************************************/
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static int TimeZone(time_t t)
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{
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struct tm *tm = gmtime(&t);
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struct tm tm_utc;
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if (!tm)
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return 0;
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tm_utc = *tm;
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tm = localtime(&t);
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if (!tm)
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return 0;
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return tm_diff(&tm_utc,tm);
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}
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static BOOL done_serverzone_init;
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/* Return the smb serverzone value */
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static int get_serverzone(void)
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{
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static int serverzone;
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if (!done_serverzone_init) {
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serverzone = TimeZone(time(NULL));
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if ((serverzone % 60) != 0) {
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DEBUG(1,("WARNING: Your timezone is not a multiple of 1 minute.\n"));
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}
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DEBUG(4,("Serverzone is %d\n",serverzone));
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done_serverzone_init = True;
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}
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return serverzone;
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}
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/* Re-read the smb serverzone value */
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static struct timeval start_time_hires;
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void TimeInit(void)
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{
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done_serverzone_init = False;
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get_serverzone();
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/* Save the start time of this process. */
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if (start_time_hires.tv_sec == 0 && start_time_hires.tv_usec == 0)
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GetTimeOfDay(&start_time_hires);
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}
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/**********************************************************************
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Return a timeval struct of the uptime of this process. As TimeInit is
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done before a daemon fork then this is the start time from the parent
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daemon start. JRA.
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***********************************************************************/
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void get_process_uptime(struct timeval *ret_time)
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{
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struct timeval time_now_hires;
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GetTimeOfDay(&time_now_hires);
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ret_time->tv_sec = time_now_hires.tv_sec - start_time_hires.tv_sec;
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ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
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if (time_now_hires.tv_usec < start_time_hires.tv_usec) {
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ret_time->tv_sec -= 1;
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ret_time->tv_usec = 1000000 + (time_now_hires.tv_usec - start_time_hires.tv_usec);
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} else
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ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
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}
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/*******************************************************************
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return the same value as TimeZone, but it should be more efficient.
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We keep a table of DST offsets to prevent calling localtime() on each
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call of this function. This saves a LOT of time on many unixes.
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Updated by Paul Eggert <eggert@twinsun.com>
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********************************************************************/
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static int TimeZoneFaster(time_t t)
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{
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static struct dst_table {time_t start,end; int zone;} *tdt, *dst_table = NULL;
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static int table_size = 0;
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int i;
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int zone = 0;
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if (t == 0) t = time(NULL);
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/* Tunis has a 8 day DST region, we need to be careful ... */
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#define MAX_DST_WIDTH (365*24*60*60)
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#define MAX_DST_SKIP (7*24*60*60)
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for (i=0;i<table_size;i++)
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if (t >= dst_table[i].start && t <= dst_table[i].end) break;
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if (i<table_size) {
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zone = dst_table[i].zone;
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} else {
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time_t low,high;
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zone = TimeZone(t);
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tdt = (struct dst_table *)Realloc(dst_table,
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sizeof(dst_table[0])*(i+1));
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if (!tdt) {
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DEBUG(0,("TimeZoneFaster: out of memory!\n"));
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SAFE_FREE(dst_table);
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table_size = 0;
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} else {
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dst_table = tdt;
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table_size++;
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dst_table[i].zone = zone;
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dst_table[i].start = dst_table[i].end = t;
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/* no entry will cover more than 6 months */
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low = t - MAX_DST_WIDTH/2;
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if (t < low)
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low = TIME_T_MIN;
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high = t + MAX_DST_WIDTH/2;
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if (high < t)
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high = TIME_T_MAX;
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/* widen the new entry using two bisection searches */
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while (low+60*60 < dst_table[i].start) {
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if (dst_table[i].start - low > MAX_DST_SKIP*2)
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t = dst_table[i].start - MAX_DST_SKIP;
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else
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t = low + (dst_table[i].start-low)/2;
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if (TimeZone(t) == zone)
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dst_table[i].start = t;
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else
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low = t;
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}
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while (high-60*60 > dst_table[i].end) {
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if (high - dst_table[i].end > MAX_DST_SKIP*2)
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t = dst_table[i].end + MAX_DST_SKIP;
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else
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t = high - (high-dst_table[i].end)/2;
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if (TimeZone(t) == zone)
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dst_table[i].end = t;
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else
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high = t;
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}
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#if 0
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DEBUG(1,("Added DST entry from %s ",
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asctime(localtime(&dst_table[i].start))));
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DEBUG(1,("to %s (%d)\n",asctime(localtime(&dst_table[i].end)),
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dst_table[i].zone));
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#endif
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}
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}
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return zone;
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}
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/****************************************************************************
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return the UTC offset in seconds west of UTC, adjusted for extra time offset
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**************************************************************************/
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int TimeDiff(time_t t)
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{
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return TimeZoneFaster(t) + 60*extra_time_offset;
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}
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/****************************************************************************
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return the UTC offset in seconds west of UTC, adjusted for extra time
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offset, for a local time value. If ut = lt + LocTimeDiff(lt), then
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lt = ut - TimeDiff(ut), but the converse does not necessarily hold near
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daylight savings transitions because some local times are ambiguous.
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LocTimeDiff(t) equals TimeDiff(t) except near daylight savings transitions.
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+**************************************************************************/
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static int LocTimeDiff(time_t lte)
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{
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time_t lt = lte - 60*extra_time_offset;
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int d = TimeZoneFaster(lt);
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time_t t = lt + d;
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/* if overflow occurred, ignore all the adjustments so far */
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if (((lte < lt) ^ (extra_time_offset < 0)) | ((t < lt) ^ (d < 0)))
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t = lte;
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/* now t should be close enough to the true UTC to yield the right answer */
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return TimeDiff(t);
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}
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/****************************************************************************
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try to optimise the localtime call, it can be quite expensive on some machines
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****************************************************************************/
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struct tm *LocalTime(time_t *t)
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{
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time_t t2 = *t;
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t2 -= TimeDiff(t2);
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return(gmtime(&t2));
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}
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#define TIME_FIXUP_CONSTANT (369.0*365.25*24*60*60-(3.0*24*60*60+6.0*60*60))
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/****************************************************************************
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interpret an 8 byte "filetime" structure to a time_t
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It's originally in "100ns units since jan 1st 1601"
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It appears to be kludge-GMT (at least for file listings). This means
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its the GMT you get by taking a localtime and adding the
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serverzone. This is NOT the same as GMT in some cases. This routine
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converts this to real GMT.
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****************************************************************************/
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time_t nt_time_to_unix(NTTIME *nt)
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{
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double d;
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time_t ret;
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/* The next two lines are a fix needed for the
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broken SCO compiler. JRA. */
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time_t l_time_min = TIME_T_MIN;
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time_t l_time_max = TIME_T_MAX;
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if (nt->high == 0 || (nt->high == 0xffffffff && nt->low == 0xffffffff))
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return(0);
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d = ((double)nt->high)*4.0*(double)(1<<30);
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d += (nt->low&0xFFF00000);
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d *= 1.0e-7;
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/* now adjust by 369 years to make the secs since 1970 */
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d -= TIME_FIXUP_CONSTANT;
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if (!(l_time_min <= d && d <= l_time_max))
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return(0);
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ret = (time_t)(d+0.5);
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/* this takes us from kludge-GMT to real GMT */
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ret -= get_serverzone();
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ret += LocTimeDiff(ret);
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return(ret);
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}
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/****************************************************************************
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Convert a NTTIME structure to a time_t.
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It's originally in "100ns units".
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This is an absolute version of the one above.
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By absolute I mean, it doesn't adjust from 1/1/1601 to 1/1/1970
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if the NTTIME was 5 seconds, the time_t is 5 seconds. JFM
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****************************************************************************/
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time_t nt_time_to_unix_abs(NTTIME *nt)
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{
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double d;
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time_t ret;
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/* The next two lines are a fix needed for the
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broken SCO compiler. JRA. */
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time_t l_time_min = TIME_T_MIN;
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time_t l_time_max = TIME_T_MAX;
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if (nt->high == 0)
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return(0);
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if (nt->high==0x80000000 && nt->low==0)
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return -1;
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/* reverse the time */
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/* it's a negative value, turn it to positive */
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nt->high=~nt->high;
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nt->low=~nt->low;
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d = ((double)nt->high)*4.0*(double)(1<<30);
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d += (nt->low&0xFFF00000);
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d *= 1.0e-7;
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if (!(l_time_min <= d && d <= l_time_max))
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return(0);
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ret = (time_t)(d+0.5);
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return(ret);
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}
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/****************************************************************************
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interprets an nt time into a unix time_t
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****************************************************************************/
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time_t interpret_long_date(char *p)
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{
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NTTIME nt;
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nt.low = IVAL(p,0);
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nt.high = IVAL(p,4);
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return nt_time_to_unix(&nt);
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}
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/****************************************************************************
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put a 8 byte filetime from a time_t
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This takes real GMT as input and converts to kludge-GMT
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****************************************************************************/
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void unix_to_nt_time(NTTIME *nt, time_t t)
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{
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double d;
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if (t==0)
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{
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nt->low = 0;
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nt->high = 0;
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return;
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}
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if (t == TIME_T_MAX)
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{
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nt->low = 0xffffffff;
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nt->high = 0x7fffffff;
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return;
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}
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if (t == -1)
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{
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nt->low = 0xffffffff;
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nt->high = 0xffffffff;
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return;
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}
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/* this converts GMT to kludge-GMT */
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t -= TimeDiff(t) - get_serverzone();
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d = (double)(t);
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d += TIME_FIXUP_CONSTANT;
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d *= 1.0e7;
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nt->high = (uint32)(d * (1.0/(4.0*(double)(1<<30))));
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nt->low = (uint32)(d - ((double)nt->high)*4.0*(double)(1<<30));
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}
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/****************************************************************************
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Convert a time_t to a NTTIME structure
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This is an absolute version of the one above.
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By absolute I mean, it doesn't adjust from 1/1/1970 to 1/1/1601
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If the nttime_t was 5 seconds, the NTTIME is 5 seconds. JFM
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****************************************************************************/
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void unix_to_nt_time_abs(NTTIME *nt, time_t t)
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{
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double d;
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if (t==0) {
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nt->low = 0;
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nt->high = 0;
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return;
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}
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if (t == TIME_T_MAX) {
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nt->low = 0xffffffff;
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nt->high = 0x7fffffff;
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return;
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}
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if (t == -1) {
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/* that's what NT uses for infinite */
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nt->low = 0x0;
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nt->high = 0x80000000;
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return;
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}
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d = (double)(t);
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d *= 1.0e7;
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nt->high = (uint32)(d * (1.0/(4.0*(double)(1<<30))));
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nt->low = (uint32)(d - ((double)nt->high)*4.0*(double)(1<<30));
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/* convert to a negative value */
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nt->high=~nt->high;
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nt->low=~nt->low;
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}
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/****************************************************************************
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take an NTTIME structure, containing high / low time. convert to unix time.
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lkclXXXX this may need 2 SIVALs not a memcpy. we'll see...
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****************************************************************************/
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void put_long_date(char *p,time_t t)
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{
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NTTIME nt;
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unix_to_nt_time(&nt, t);
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SIVAL(p, 0, nt.low);
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SIVAL(p, 4, nt.high);
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}
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/****************************************************************************
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check if it's a null mtime
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****************************************************************************/
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BOOL null_mtime(time_t mtime)
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{
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if (mtime == 0 || mtime == (time_t)0xFFFFFFFF || mtime == (time_t)-1)
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return(True);
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return(False);
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}
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/*******************************************************************
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create a 16 bit dos packed date
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********************************************************************/
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static uint16 make_dos_date1(struct tm *t)
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{
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uint16 ret=0;
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ret = (((unsigned)(t->tm_mon+1)) >> 3) | ((t->tm_year-80) << 1);
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ret = ((ret&0xFF)<<8) | (t->tm_mday | (((t->tm_mon+1) & 0x7) << 5));
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return(ret);
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}
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/*******************************************************************
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create a 16 bit dos packed time
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********************************************************************/
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static uint16 make_dos_time1(struct tm *t)
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{
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uint16 ret=0;
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ret = ((((unsigned)t->tm_min >> 3)&0x7) | (((unsigned)t->tm_hour) << 3));
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ret = ((ret&0xFF)<<8) | ((t->tm_sec/2) | ((t->tm_min & 0x7) << 5));
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return(ret);
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}
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/*******************************************************************
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create a 32 bit dos packed date/time from some parameters
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This takes a GMT time and returns a packed localtime structure
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********************************************************************/
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static uint32 make_dos_date(time_t unixdate)
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{
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struct tm *t;
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uint32 ret=0;
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t = LocalTime(&unixdate);
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if (!t)
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return 0xFFFFFFFF;
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ret = make_dos_date1(t);
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ret = ((ret&0xFFFF)<<16) | make_dos_time1(t);
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return(ret);
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}
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/*******************************************************************
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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 = (time_t)IVAL(date_ptr,0);
|
|
if (!null_mtime(t))
|
|
t += LocTimeDiff(t);
|
|
return(t);
|
|
}
|
|
|
|
|
|
/***************************************************************************
|
|
return a HTTP/1.0 time string
|
|
***************************************************************************/
|
|
char *http_timestring(time_t t)
|
|
{
|
|
static fstring buf;
|
|
struct tm *tm = LocalTime(&t);
|
|
|
|
if (!tm)
|
|
slprintf(buf,sizeof(buf)-1,"%ld seconds since the Epoch",(long)t);
|
|
else
|
|
#ifndef HAVE_STRFTIME
|
|
fstrcpy(buf, asctime(tm));
|
|
if(buf[strlen(buf)-1] == '\n')
|
|
buf[strlen(buf)-1] = 0;
|
|
#else /* !HAVE_STRFTIME */
|
|
strftime(buf, sizeof(buf)-1, "%a, %d %b %Y %H:%M:%S %Z", tm);
|
|
#endif /* !HAVE_STRFTIME */
|
|
return buf;
|
|
}
|
|
|
|
|
|
|
|
/****************************************************************************
|
|
Return the date and time as a string
|
|
****************************************************************************/
|
|
|
|
char *timestring(BOOL hires)
|
|
{
|
|
static fstring TimeBuf;
|
|
struct timeval tp;
|
|
time_t t;
|
|
struct tm *tm;
|
|
|
|
if (hires) {
|
|
GetTimeOfDay(&tp);
|
|
t = (time_t)tp.tv_sec;
|
|
} else {
|
|
t = time(NULL);
|
|
}
|
|
tm = LocalTime(&t);
|
|
if (!tm) {
|
|
if (hires) {
|
|
slprintf(TimeBuf,
|
|
sizeof(TimeBuf)-1,
|
|
"%ld.%06ld seconds since the Epoch",
|
|
(long)tp.tv_sec,
|
|
(long)tp.tv_usec);
|
|
} else {
|
|
slprintf(TimeBuf,
|
|
sizeof(TimeBuf)-1,
|
|
"%ld seconds since the Epoch",
|
|
(long)t);
|
|
}
|
|
} else {
|
|
#ifdef HAVE_STRFTIME
|
|
if (hires) {
|
|
strftime(TimeBuf,sizeof(TimeBuf)-1,"%Y/%m/%d %H:%M:%S",tm);
|
|
slprintf(TimeBuf+strlen(TimeBuf),
|
|
sizeof(TimeBuf)-1 - strlen(TimeBuf),
|
|
".%06ld",
|
|
(long)tp.tv_usec);
|
|
} else {
|
|
strftime(TimeBuf,100,"%Y/%m/%d %H:%M:%S",tm);
|
|
}
|
|
#else
|
|
if (hires) {
|
|
slprintf(TimeBuf,
|
|
sizeof(TimeBuf)-1,
|
|
"%s.%06ld",
|
|
asctime(tm),
|
|
(long)tp.tv_usec);
|
|
} else {
|
|
fstrcpy(TimeBuf, asctime(tm));
|
|
}
|
|
#endif
|
|
}
|
|
return(TimeBuf);
|
|
}
|
|
|
|
/****************************************************************************
|
|
return the best approximation to a 'create time' under UNIX from a stat
|
|
structure.
|
|
****************************************************************************/
|
|
|
|
time_t get_create_time(SMB_STRUCT_STAT *st,BOOL fake_dirs)
|
|
{
|
|
time_t ret, ret1;
|
|
|
|
if(S_ISDIR(st->st_mode) && fake_dirs)
|
|
return (time_t)315493200L; /* 1/1/1980 */
|
|
|
|
ret = MIN(st->st_ctime, st->st_mtime);
|
|
ret1 = MIN(ret, st->st_atime);
|
|
|
|
if(ret1 != (time_t)0)
|
|
return ret1;
|
|
|
|
/*
|
|
* One of ctime, mtime or atime was zero (probably atime).
|
|
* Just return MIN(ctime, mtime).
|
|
*/
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
initialise an NTTIME to -1, which means "unknown" or "don't expire"
|
|
****************************************************************************/
|
|
|
|
void init_nt_time(NTTIME *nt)
|
|
{
|
|
nt->high = 0x7FFFFFFF;
|
|
nt->low = 0xFFFFFFFF;
|
|
}
|
|
|
|
/****************************************************************************
|
|
check if NTTIME is 0
|
|
****************************************************************************/
|
|
BOOL nt_time_is_zero(NTTIME *nt)
|
|
{
|
|
if(nt->high==0)
|
|
return True;
|
|
return False;
|
|
}
|