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time.c

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/* 
   Unix SMB/CIFS implementation.
   time handling functions

   Copyright (C) Andrew Tridgell          1992-2004
   Copyright (C) Stefan (metze) Metzmacher      2002   
   Copyright (C) Jeremy Allison                 2007

   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"

/**
 * @file
 * @brief time handling functions
 */


#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

#define NTTIME_INFINITY (NTTIME)0x8000000000000000LL

/***************************************************************************
 External access to time_t_min and time_t_max.
****************************************************************************/

time_t get_time_t_max(void)
{
      return TIME_T_MAX;
}

/***************************************************************************
 A gettimeofday wrapper.
****************************************************************************/

void GetTimeOfDay(struct timeval *tval)
{
#ifdef HAVE_GETTIMEOFDAY_TZ
      gettimeofday(tval,NULL);
#else
      gettimeofday(tval);
#endif
}

#if (SIZEOF_LONG == 8)
#define TIME_FIXUP_CONSTANT_INT 11644473600L
#elif (SIZEOF_LONG_LONG == 8)
#define TIME_FIXUP_CONSTANT_INT 11644473600LL
#endif

/****************************************************************************
 Interpret an 8 byte "filetime" structure to a time_t
 It's originally in "100ns units since jan 1st 1601"

 An 8 byte value of 0xffffffffffffffff will be returned as a timespec of

      tv_sec = 0
      tv_nsec = 0;

 Returns GMT.
****************************************************************************/

time_t nt_time_to_unix(NTTIME nt)
{
      return convert_timespec_to_time_t(nt_time_to_unix_timespec(&nt));
}

/****************************************************************************
 Put a 8 byte filetime from a time_t. Uses GMT.
****************************************************************************/

void unix_to_nt_time(NTTIME *nt, time_t t)
{
      uint64_t t2; 

      if (t == (time_t)-1) {
            *nt = (NTTIME)-1LL;
            return;
      }     

      if (t == TIME_T_MAX) {
            *nt = 0x7fffffffffffffffLL;
            return;
      }

      if (t == 0) {
            *nt = 0;
            return;
      }           

      t2 = t;
      t2 += TIME_FIXUP_CONSTANT_INT;
      t2 *= 1000*1000*10;

      *nt = t2;
}

/****************************************************************************
 Check if it's a null unix time.
****************************************************************************/

bool null_time(time_t t)
{
      return t == 0 || 
            t == (time_t)0xFFFFFFFF || 
            t == (time_t)-1;
}

/****************************************************************************
 Check if it's a null NTTIME.
****************************************************************************/

bool null_nttime(NTTIME t)
{
      return t == 0 || t == (NTTIME)-1;
}

/****************************************************************************
 Check if it's a null timespec.
****************************************************************************/

bool null_timespec(struct timespec ts)
{
      return ts.tv_sec == 0 || 
            ts.tv_sec == (time_t)0xFFFFFFFF || 
            ts.tv_sec == (time_t)-1;
}

/*******************************************************************
  create a 16 bit dos packed date
********************************************************************/
static uint16_t make_dos_date1(struct tm *t)
{
      uint16_t ret=0;
      ret = (((unsigned int)(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_t make_dos_time1(struct tm *t)
{
      uint16_t ret=0;
      ret = ((((unsigned int)t->tm_min >> 3)&0x7) | (((unsigned int)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_t make_dos_date(time_t unixdate, int zone_offset)
{
      struct tm *t;
      uint32_t ret=0;

      if (unixdate == 0) {
            return 0;
      }

      unixdate -= zone_offset;

      t = gmtime(&unixdate);
      if (!t) {
            return 0xFFFFFFFF;
      }

      ret = make_dos_date1(t);
      ret = ((ret&0xFFFF)<<16) | make_dos_time1(t);

      return ret;
}

/**
put a dos date into a buffer (time/date format)
This takes GMT time and puts local time in the buffer
**/
00199 void push_dos_date(uint8_t *buf, int offset, time_t unixdate, int zone_offset)
{
      uint32_t x = make_dos_date(unixdate, zone_offset);
      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
**/
00209 void push_dos_date2(uint8_t *buf,int offset,time_t unixdate, int zone_offset)
{
      uint32_t x;
      x = make_dos_date(unixdate, zone_offset);
      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)
**/
00222 void push_dos_date3(uint8_t *buf,int offset,time_t unixdate, int zone_offset)
{
      if (!null_time(unixdate)) {
            unixdate -= zone_offset;
      }
      SIVAL(buf,offset,unixdate);
}

/*******************************************************************
  interpret a 32 bit dos packed date/time to some parameters
********************************************************************/
static void interpret_dos_date(uint32_t date,int *year,int *month,int *day,int *hour,int *minute,int *second)
{
      uint32_t 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)
**/
00252 time_t pull_dos_date(const uint8_t *date_ptr, int zone_offset)
{
      uint32_t dos_date=0;
      struct tm t;
      time_t ret;

      dos_date = IVAL(date_ptr,0);

      if (dos_date == 0) return (time_t)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;
  
      ret = timegm(&t);

      ret += zone_offset;

      return ret;
}

/**
like make_unix_date() but the words are reversed
**/
00276 time_t pull_dos_date2(const uint8_t *date_ptr, int zone_offset)
{
      uint32_t x,x2;

      x = IVAL(date_ptr,0);
      x2 = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
      SIVAL(&x,0,x2);

      return pull_dos_date((const uint8_t *)&x, zone_offset);
}

/**
  create a unix GMT date from a dos date in 32 bit "unix like" format
  these generally arrive as localtimes, with corresponding DST
**/
00291 time_t pull_dos_date3(const uint8_t *date_ptr, int zone_offset)
{
      time_t t = (time_t)IVAL(date_ptr,0);
      if (!null_time(t)) {
            t += zone_offset;
      }
      return t;
}

/***************************************************************************
 Return a HTTP/1.0 time string.
***************************************************************************/

char *http_timestring(time_t t)
{
      fstring buf;
      struct tm *tm = localtime(&t);

      if (t == TIME_T_MAX) {
            fstrcpy(buf, "never");
      } else if (!tm) {
            fstr_sprintf(buf, "%ld seconds since the Epoch", (long)t);
      } else {
#ifndef HAVE_STRFTIME
            const char *asct = asctime(tm);
            fstrcpy(buf, asct ? asct : "unknown");
      }
      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 talloc_strdup(talloc_tos(), buf);
}


/**
 Return the date and time as a string
**/
00331 char *timestring(TALLOC_CTX *mem_ctx, time_t t)
{
      char *TimeBuf;
      char tempTime[80];
      struct tm *tm;

      tm = localtime(&t);
      if (!tm) {
            return talloc_asprintf(mem_ctx,
                               "%ld seconds since the Epoch",
                               (long)t);
      }

#ifdef HAVE_STRFTIME
      /* some versions of gcc complain about using %c. This is a bug
         in the gcc warning, not a bug in this code. See a recent
         strftime() manual page for details.
       */
      strftime(tempTime,sizeof(tempTime)-1,"%c %Z",tm);
      TimeBuf = talloc_strdup(mem_ctx, tempTime);
#else
      TimeBuf = talloc_strdup(mem_ctx, asctime(tm));
#endif

      return TimeBuf;
}

/**
  return a talloced string representing a NTTIME for human consumption
*/
00361 const char *nt_time_string(TALLOC_CTX *mem_ctx, NTTIME nt)
{
      time_t t;
      if (nt == 0) {
            return "NTTIME(0)";
      }
      t = nt_time_to_unix(nt);
      return timestring(mem_ctx, t);
}


/**
  parse a nttime as a large integer in a string and return a NTTIME
*/
00375 NTTIME nttime_from_string(const char *s)
{
      return strtoull(s, NULL, 0);
}

/**
  return (tv1 - tv2) in microseconds
*/
00383 int64_t usec_time_diff(struct timeval *tv1, struct timeval *tv2)
{
      int64_t sec_diff = tv1->tv_sec - tv2->tv_sec;
      return (sec_diff * 1000000) + (int64_t)(tv1->tv_usec - tv2->tv_usec);
}


/**
  return a zero timeval
*/
00393 struct timeval timeval_zero(void)
{
      struct timeval tv;
      tv.tv_sec = 0;
      tv.tv_usec = 0;
      return tv;
}

/**
  return True if a timeval is zero
*/
00404 bool timeval_is_zero(const struct timeval *tv)
{
      return tv->tv_sec == 0 && tv->tv_usec == 0;
}

/**
  return a timeval for the current time
*/
00412 struct timeval timeval_current(void)
{
      struct timeval tv;
      GetTimeOfDay(&tv);
      return tv;
}

/**
  return a timeval struct with the given elements
*/
00422 struct timeval timeval_set(uint32_t secs, uint32_t usecs)
{
      struct timeval tv;
      tv.tv_sec = secs;
      tv.tv_usec = usecs;
      return tv;
}


/**
  return a timeval ofs microseconds after tv
*/
00434 struct timeval timeval_add(const struct timeval *tv,
                     uint32_t secs, uint32_t usecs)
{
      struct timeval tv2 = *tv;
      const unsigned int million = 1000000;
      tv2.tv_sec += secs;
      tv2.tv_usec += usecs;
      tv2.tv_sec += tv2.tv_usec / million;
      tv2.tv_usec = tv2.tv_usec % million;
      return tv2;
}

/**
  return the sum of two timeval structures
*/
00449 struct timeval timeval_sum(const struct timeval *tv1,
                     const struct timeval *tv2)
{
      return timeval_add(tv1, tv2->tv_sec, tv2->tv_usec);
}

/**
  return a timeval secs/usecs into the future
*/
00458 struct timeval timeval_current_ofs(uint32_t secs, uint32_t usecs)
{
      struct timeval tv = timeval_current();
      return timeval_add(&tv, secs, usecs);
}

/**
  compare two timeval structures. 
  Return -1 if tv1 < tv2
  Return 0 if tv1 == tv2
  Return 1 if tv1 > tv2
*/
00470 int timeval_compare(const struct timeval *tv1, const struct timeval *tv2)
{
      if (tv1->tv_sec  > tv2->tv_sec)  return 1;
      if (tv1->tv_sec  < tv2->tv_sec)  return -1;
      if (tv1->tv_usec > tv2->tv_usec) return 1;
      if (tv1->tv_usec < tv2->tv_usec) return -1;
      return 0;
}

/**
  return True if a timer is in the past
*/
00482 bool timeval_expired(const struct timeval *tv)
{
      struct timeval tv2 = timeval_current();
      if (tv2.tv_sec > tv->tv_sec) return True;
      if (tv2.tv_sec < tv->tv_sec) return False;
      return (tv2.tv_usec >= tv->tv_usec);
}

/**
  return the number of seconds elapsed between two times
*/
00493 double timeval_elapsed2(const struct timeval *tv1, const struct timeval *tv2)
{
      return (tv2->tv_sec - tv1->tv_sec) + 
             (tv2->tv_usec - tv1->tv_usec)*1.0e-6;
}

/**
  return the number of seconds elapsed since a given time
*/
00502 double timeval_elapsed(const struct timeval *tv)
{
      struct timeval tv2 = timeval_current();
      return timeval_elapsed2(tv, &tv2);
}

/**
  return the lesser of two timevals
*/
00511 struct timeval timeval_min(const struct timeval *tv1,
                     const struct timeval *tv2)
{
      if (tv1->tv_sec < tv2->tv_sec) return *tv1;
      if (tv1->tv_sec > tv2->tv_sec) return *tv2;
      if (tv1->tv_usec < tv2->tv_usec) return *tv1;
      return *tv2;
}

/**
  return the greater of two timevals
*/
00523 struct timeval timeval_max(const struct timeval *tv1,
                     const struct timeval *tv2)
{
      if (tv1->tv_sec > tv2->tv_sec) return *tv1;
      if (tv1->tv_sec < tv2->tv_sec) return *tv2;
      if (tv1->tv_usec > tv2->tv_usec) return *tv1;
      return *tv2;
}

/**
  return the difference between two timevals as a timeval
  if tv1 comes after tv2, then return a zero timeval
  (this is *tv2 - *tv1)
*/
00537 struct timeval timeval_until(const struct timeval *tv1,
                       const struct timeval *tv2)
{
      struct timeval t;
      if (timeval_compare(tv1, tv2) >= 0) {
            return timeval_zero();
      }
      t.tv_sec = tv2->tv_sec - tv1->tv_sec;
      if (tv1->tv_usec > tv2->tv_usec) {
            t.tv_sec--;
            t.tv_usec = 1000000 - (tv1->tv_usec - tv2->tv_usec);
      } else {
            t.tv_usec = tv2->tv_usec - tv1->tv_usec;
      }
      return t;
}


/**
  convert a timeval to a NTTIME
*/
00558 NTTIME timeval_to_nttime(const struct timeval *tv)
{
      return 10*(tv->tv_usec + 
              ((TIME_FIXUP_CONSTANT_INT + (uint64_t)tv->tv_sec) * 1000000));
}

/**************************************************************
 Handle conversions between time_t and uint32, taking care to
 preserve the "special" values.
**************************************************************/

uint32 convert_time_t_to_uint32(time_t t)
{
#if (defined(SIZEOF_TIME_T) && (SIZEOF_TIME_T == 8))
      /* time_t is 64-bit. */
      if (t == 0x8000000000000000LL) {
            return 0x80000000;
      } else if (t == 0x7FFFFFFFFFFFFFFFLL) {
            return 0x7FFFFFFF;
      }
#endif
      return (uint32)t;
}

time_t convert_uint32_to_time_t(uint32 u)
{
#if (defined(SIZEOF_TIME_T) && (SIZEOF_TIME_T == 8))
      /* time_t is 64-bit. */
      if (u == 0x80000000) {
            return (time_t)0x8000000000000000LL;
      } else if (u == 0x7FFFFFFF) {
            return (time_t)0x7FFFFFFFFFFFFFFFLL;
      }
#endif
      return (time_t)u;
}

/*******************************************************************
 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 + (1900 - 1);
      int by = b->tm_year + (1900 - 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;
}

int extra_time_offset=0;

/*******************************************************************
 Return the UTC offset in seconds west of UTC, or 0 if it cannot be determined.
********************************************************************/

int get_time_zone(time_t t)
{
      struct tm *tm = gmtime(&t);
      struct tm tm_utc;
      if (!tm)
            return 0;
      tm_utc = *tm;
      tm = localtime(&t);
      if (!tm)
            return 0;
      return tm_diff(&tm_utc,tm)+60*extra_time_offset;
}

/****************************************************************************
 Check if NTTIME is 0.
****************************************************************************/

bool nt_time_is_zero(const NTTIME *nt)
{
      return (*nt == 0);
}

/****************************************************************************
 Convert ASN.1 GeneralizedTime string to unix-time.
 Returns 0 on failure; Currently ignores timezone. 
****************************************************************************/

time_t generalized_to_unix_time(const char *str)
{ 
      struct tm tm;

      ZERO_STRUCT(tm);

      if (sscanf(str, "%4d%2d%2d%2d%2d%2d", 
               &tm.tm_year, &tm.tm_mon, &tm.tm_mday, 
               &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) {
            return 0;
      }
      tm.tm_year -= 1900;
      tm.tm_mon -= 1;

      return timegm(&tm);
}

/*******************************************************************
 Accessor function for the server time zone offset.
 set_server_zone_offset() must have been called first.
******************************************************************/

static int server_zone_offset;

int get_server_zone_offset(void)
{
      return server_zone_offset;
}

/*******************************************************************
 Initialize the server time zone offset. Called when a client connects.
******************************************************************/

int set_server_zone_offset(time_t t)
{
      server_zone_offset = get_time_zone(t);
      return server_zone_offset;
}

/****************************************************************************
 Return the date and time as a string
****************************************************************************/

char *current_timestring(bool hires)
{
      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,sizeof(TimeBuf)-1,"%Y/%m/%d %H:%M:%S",tm);
            }
#else
            if (hires) {
                  const char *asct = asctime(tm);
                  slprintf(TimeBuf, 
                         sizeof(TimeBuf)-1, 
                         "%s.%06ld", 
                         asct ? asct : "unknown", 
                         (long)tp.tv_usec);
            } else {
                  const char *asct = asctime(tm);
                  fstrcpy(TimeBuf, asct ? asct : "unknown");
            }
#endif
      }
      return talloc_strdup(talloc_tos(), TimeBuf);
}


/*******************************************************************
 Put a dos date into a buffer (time/date format).
 This takes GMT time and puts local time in the buffer.
********************************************************************/

static void put_dos_date(char *buf,int offset,time_t unixdate, int zone_offset)
{
      uint32 x = make_dos_date(unixdate, zone_offset);
      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.
********************************************************************/

static void put_dos_date2(char *buf,int offset,time_t unixdate, int zone_offset)
{
      uint32 x = make_dos_date(unixdate, zone_offset);
      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)
********************************************************************/

static void put_dos_date3(char *buf,int offset,time_t unixdate, int zone_offset)
{
      if (!null_mtime(unixdate)) {
            unixdate -= zone_offset;
      }
      SIVAL(buf,offset,unixdate);
}


/***************************************************************************
 Server versions of the above functions.
***************************************************************************/

void srv_put_dos_date(char *buf,int offset,time_t unixdate)
{
      put_dos_date(buf, offset, unixdate, server_zone_offset);
}

void srv_put_dos_date2(char *buf,int offset, time_t unixdate)
{
      put_dos_date2(buf, offset, unixdate, server_zone_offset);
}

void srv_put_dos_date3(char *buf,int offset,time_t unixdate)
{
      put_dos_date3(buf, offset, unixdate, server_zone_offset);
}

/****************************************************************************
 Take a Unix time and convert to an NTTIME structure and place in buffer 
 pointed to by p.
****************************************************************************/

void put_long_date_timespec(char *p, struct timespec ts)
{
      NTTIME nt;
      unix_timespec_to_nt_time(&nt, ts);
      SIVAL(p, 0, nt & 0xFFFFFFFF);
      SIVAL(p, 4, nt >> 32);
}

void put_long_date(char *p, time_t t)
{
      struct timespec ts;
      ts.tv_sec = t;
      ts.tv_nsec = 0;
      put_long_date_timespec(p, ts);
}

/****************************************************************************
 Return the best approximation to a 'create time' under UNIX from a stat
 structure.
****************************************************************************/

time_t get_create_time(const 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;
}

struct timespec get_create_timespec(const SMB_STRUCT_STAT *st,bool fake_dirs)
{
      struct timespec ts;
      ts.tv_sec = get_create_time(st, fake_dirs);
      ts.tv_nsec = 0;
      return ts;
}

/****************************************************************************
 Get/Set all the possible time fields from a stat struct as a timespec.
****************************************************************************/

struct timespec get_atimespec(const SMB_STRUCT_STAT *pst)
{
#if !defined(HAVE_STAT_HIRES_TIMESTAMPS)
      struct timespec ret;

      /* Old system - no ns timestamp. */
      ret.tv_sec = pst->st_atime;
      ret.tv_nsec = 0;
      return ret;
#else
#if defined(HAVE_STAT_ST_ATIM)
      return pst->st_atim;
#elif defined(HAVE_STAT_ST_ATIMENSEC)
      struct timespec ret;
      ret.tv_sec = pst->st_atime;
      ret.tv_nsec = pst->st_atimensec;
      return ret;
#else
#error      CONFIGURE_ERROR_IN_DETECTING_TIMESPEC_IN_STAT 
#endif
#endif
}

void set_atimespec(SMB_STRUCT_STAT *pst, struct timespec ts)
{
#if !defined(HAVE_STAT_HIRES_TIMESTAMPS)
      /* Old system - no ns timestamp. */
      pst->st_atime = ts.tv_sec;
#else
#if defined(HAVE_STAT_ST_ATIM)
      pst->st_atim = ts;
#elif defined(HAVE_STAT_ST_ATIMENSEC)
      pst->st_atime = ts.tv_sec;
      pst->st_atimensec = ts.tv_nsec
#else
#error      CONFIGURE_ERROR_IN_DETECTING_TIMESPEC_IN_STAT 
#endif
#endif
}

struct timespec get_mtimespec(const SMB_STRUCT_STAT *pst)
{
#if !defined(HAVE_STAT_HIRES_TIMESTAMPS)
      struct timespec ret;

      /* Old system - no ns timestamp. */
      ret.tv_sec = pst->st_mtime;
      ret.tv_nsec = 0;
      return ret;
#else
#if defined(HAVE_STAT_ST_MTIM)
      return pst->st_mtim;
#elif defined(HAVE_STAT_ST_MTIMENSEC)
      struct timespec ret;
      ret.tv_sec = pst->st_mtime;
      ret.tv_nsec = pst->st_mtimensec;
      return ret;
#else
#error      CONFIGURE_ERROR_IN_DETECTING_TIMESPEC_IN_STAT 
#endif
#endif
}

void set_mtimespec(SMB_STRUCT_STAT *pst, struct timespec ts)
{
#if !defined(HAVE_STAT_HIRES_TIMESTAMPS)
      /* Old system - no ns timestamp. */
      pst->st_mtime = ts.tv_sec;
#else
#if defined(HAVE_STAT_ST_MTIM)
      pst->st_mtim = ts;
#elif defined(HAVE_STAT_ST_MTIMENSEC)
      pst->st_mtime = ts.tv_sec;
      pst->st_mtimensec = ts.tv_nsec
#else
#error      CONFIGURE_ERROR_IN_DETECTING_TIMESPEC_IN_STAT 
#endif
#endif
}

struct timespec get_ctimespec(const SMB_STRUCT_STAT *pst)
{
#if !defined(HAVE_STAT_HIRES_TIMESTAMPS)
      struct timespec ret;

      /* Old system - no ns timestamp. */
      ret.tv_sec = pst->st_ctime;
      ret.tv_nsec = 0;
      return ret;
#else
#if defined(HAVE_STAT_ST_CTIM)
      return pst->st_ctim;
#elif defined(HAVE_STAT_ST_CTIMENSEC)
      struct timespec ret;
      ret.tv_sec = pst->st_ctime;
      ret.tv_nsec = pst->st_ctimensec;
      return ret;
#else
#error      CONFIGURE_ERROR_IN_DETECTING_TIMESPEC_IN_STAT 
#endif
#endif
}

void set_ctimespec(SMB_STRUCT_STAT *pst, struct timespec ts)
{
#if !defined(HAVE_STAT_HIRES_TIMESTAMPS)
      /* Old system - no ns timestamp. */
      pst->st_ctime = ts.tv_sec;
#else
#if defined(HAVE_STAT_ST_CTIM)
      pst->st_ctim = ts;
#elif defined(HAVE_STAT_ST_CTIMENSEC)
      pst->st_ctime = ts.tv_sec;
      pst->st_ctimensec = ts.tv_nsec
#else
#error      CONFIGURE_ERROR_IN_DETECTING_TIMESPEC_IN_STAT 
#endif
#endif
}

void dos_filetime_timespec(struct timespec *tsp)
{
      tsp->tv_sec &= ~1;
      tsp->tv_nsec = 0;
}

/*******************************************************************
 Create a unix date (int GMT) from a dos date (which is actually in
 localtime).
********************************************************************/

static time_t make_unix_date(const void *date_ptr, int zone_offset)
{
      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;
  
      ret = timegm(&t);

      ret += zone_offset;

      return(ret);
}

/*******************************************************************
 Like make_unix_date() but the words are reversed.
********************************************************************/

static time_t make_unix_date2(const void *date_ptr, int zone_offset)
{
      uint32 x,x2;

      x = IVAL(date_ptr,0);
      x2 = ((x&0xFFFF)<<16) | ((x&0xFFFF0000)>>16);
      SIVAL(&x,0,x2);

      return(make_unix_date((const void *)&x, zone_offset));
}

/*******************************************************************
 Create a unix GMT date from a dos date in 32 bit "unix like" format
 these generally arrive as localtimes, with corresponding DST.
******************************************************************/

static time_t make_unix_date3(const void *date_ptr, int zone_offset)
{
      time_t t = (time_t)IVAL(date_ptr,0);
      if (!null_mtime(t)) {
            t += zone_offset;
      }
      return(t);
}

time_t srv_make_unix_date(const void *date_ptr)
{
      return make_unix_date(date_ptr, server_zone_offset);
}

time_t srv_make_unix_date2(const void *date_ptr)
{
      return make_unix_date2(date_ptr, server_zone_offset);
}

time_t srv_make_unix_date3(const void *date_ptr)
{
      return make_unix_date3(date_ptr, server_zone_offset);
}

time_t convert_timespec_to_time_t(struct timespec ts)
{
      /* 1 ns == 1,000,000,000 - one thousand millionths of a second.
         increment if it's greater than 500 millionth of a second. */
      if (ts.tv_nsec > 500000000) {
            return ts.tv_sec + 1;
      }
      return ts.tv_sec;
}

struct timespec convert_time_t_to_timespec(time_t t)
{
      struct timespec ts;
      ts.tv_sec = t;
      ts.tv_nsec = 0;
      return ts;
}

/****************************************************************************
 Convert a normalized timeval to a timespec.
****************************************************************************/

struct timespec convert_timeval_to_timespec(const struct timeval tv)
{
      struct timespec ts;
      ts.tv_sec = tv.tv_sec;
      ts.tv_nsec = tv.tv_usec * 1000;
      return ts;
}

/****************************************************************************
 Convert a normalized timespec to a timeval.
****************************************************************************/

struct timeval convert_timespec_to_timeval(const struct timespec ts)
{
      struct timeval tv;
      tv.tv_sec = ts.tv_sec;
      tv.tv_usec = ts.tv_nsec / 1000;
      return tv;
}

/****************************************************************************
 Return a timespec for the current time
****************************************************************************/

struct timespec timespec_current(void)
{
      struct timeval tv;
      struct timespec ts;
      GetTimeOfDay(&tv);
      ts.tv_sec = tv.tv_sec;
      ts.tv_nsec = tv.tv_usec * 1000;
      return ts;
}

/****************************************************************************
 Return the lesser of two timespecs.
****************************************************************************/

struct timespec timespec_min(const struct timespec *ts1,
                     const struct timespec *ts2)
{
      if (ts1->tv_sec < ts2->tv_sec) return *ts1;
      if (ts1->tv_sec > ts2->tv_sec) return *ts2;
      if (ts1->tv_nsec < ts2->tv_nsec) return *ts1;
      return *ts2;
}

/****************************************************************************
  compare two timespec structures. 
  Return -1 if ts1 < ts2
  Return 0 if ts1 == ts2
  Return 1 if ts1 > ts2
****************************************************************************/

int timespec_compare(const struct timespec *ts1, const struct timespec *ts2)
{
      if (ts1->tv_sec  > ts2->tv_sec)  return 1;
      if (ts1->tv_sec  < ts2->tv_sec)  return -1;
      if (ts1->tv_nsec > ts2->tv_nsec) return 1;
      if (ts1->tv_nsec < ts2->tv_nsec) return -1;
      return 0;
}

/****************************************************************************
 Interprets an nt time into a unix struct timespec.
 Differs from nt_time_to_unix in that an 8 byte value of 0xffffffffffffffff
 will be returned as (time_t)-1, whereas nt_time_to_unix returns 0 in this case.
****************************************************************************/

struct timespec interpret_long_date(const char *p)
{
      NTTIME nt;
      nt = IVAL(p,0) + ((uint64_t)IVAL(p,4) << 32);
      if (nt == (uint64_t)-1) {
            struct timespec ret;
            ret.tv_sec = (time_t)-1;
            ret.tv_nsec = 0;
            return ret;
      }
      return nt_time_to_unix_timespec(&nt);
}

/***************************************************************************
 Client versions of the above functions.
***************************************************************************/

void cli_put_dos_date(struct cli_state *cli, char *buf, int offset, time_t unixdate)
{
      put_dos_date(buf, offset, unixdate, cli->serverzone);
}

void cli_put_dos_date2(struct cli_state *cli, char *buf, int offset, time_t unixdate)
{
      put_dos_date2(buf, offset, unixdate, cli->serverzone);
}

void cli_put_dos_date3(struct cli_state *cli, char *buf, int offset, time_t unixdate)
{
      put_dos_date3(buf, offset, unixdate, cli->serverzone);
}

time_t cli_make_unix_date(struct cli_state *cli, const void *date_ptr)
{
      return make_unix_date(date_ptr, cli->serverzone);
}

time_t cli_make_unix_date2(struct cli_state *cli, const void *date_ptr)
{
      return make_unix_date2(date_ptr, cli->serverzone);
}

time_t cli_make_unix_date3(struct cli_state *cli, const void *date_ptr)
{
      return make_unix_date3(date_ptr, cli->serverzone);
}

/* Large integer version. */
struct timespec nt_time_to_unix_timespec(NTTIME *nt)
{
      int64 d;
      struct timespec ret;

      if (*nt == 0 || *nt == (int64)-1) {
            ret.tv_sec = 0;
            ret.tv_nsec = 0;
            return ret;
      }

      d = (int64)*nt;
      /* d is now in 100ns units, since jan 1st 1601".
         Save off the ns fraction. */
      
      ret.tv_nsec = (long) ((d % 100) * 100);

      /* Convert to seconds */
      d /= 1000*1000*10;

      /* Now adjust by 369 years to make the secs since 1970 */
      d -= TIME_FIXUP_CONSTANT_INT;

      if (d <= (int64)TIME_T_MIN) {
            ret.tv_sec = TIME_T_MIN;
            ret.tv_nsec = 0;
            return ret;
      }

      if (d >= (int64)TIME_T_MAX) {
            ret.tv_sec = TIME_T_MAX;
            ret.tv_nsec = 0;
            return ret;
      }

      ret.tv_sec = (time_t)d;
      return ret;
}
/****************************************************************************
 Check if two NTTIMEs are the same.
****************************************************************************/

bool nt_time_equals(const NTTIME *nt1, const NTTIME *nt2)
{
      return (*nt1 == *nt2);
}

/*******************************************************************
 Re-read the smb serverzone value.
******************************************************************/

static struct timeval start_time_hires;

void TimeInit(void)
{
      set_server_zone_offset(time(NULL));

      DEBUG(4,("TimeInit: Serverzone is %d\n", server_zone_offset));

      /* Save the start time of this process. */
      if (start_time_hires.tv_sec == 0 && start_time_hires.tv_usec == 0) {
            GetTimeOfDay(&start_time_hires);
      }
}

/**********************************************************************
 Return a timeval struct of the uptime of this process. As TimeInit is
 done before a daemon fork then this is the start time from the parent
 daemon start. JRA.
***********************************************************************/

void get_process_uptime(struct timeval *ret_time)
{
      struct timeval time_now_hires;

      GetTimeOfDay(&time_now_hires);
      ret_time->tv_sec = time_now_hires.tv_sec - start_time_hires.tv_sec;
      if (time_now_hires.tv_usec < start_time_hires.tv_usec) {
            ret_time->tv_sec -= 1;
            ret_time->tv_usec = 1000000 + (time_now_hires.tv_usec - start_time_hires.tv_usec);
      } else {
            ret_time->tv_usec = time_now_hires.tv_usec - start_time_hires.tv_usec;
      }
}

/****************************************************************************
 Convert a NTTIME structure to a time_t.
 It's originally in "100ns units".

 This is an absolute version of the one above.
 By absolute I mean, it doesn't adjust from 1/1/1601 to 1/1/1970
 if the NTTIME was 5 seconds, the time_t is 5 seconds. JFM
****************************************************************************/

time_t nt_time_to_unix_abs(const NTTIME *nt)
{
      uint64 d;

      if (*nt == 0) {
            return (time_t)0;
      }

      if (*nt == (uint64)-1) {
            return (time_t)-1;
      }

      if (*nt == NTTIME_INFINITY) {
            return (time_t)-1;
      }

      /* reverse the time */
      /* it's a negative value, turn it to positive */
      d=~*nt;

      d += 1000*1000*10/2;
      d /= 1000*1000*10;

      if (!(TIME_T_MIN <= ((time_t)d) && ((time_t)d) <= TIME_T_MAX)) {
            return (time_t)0;
      }

      return (time_t)d;
}

/****************************************************************************
 Put a 8 byte filetime from a struct timespec. Uses GMT.
****************************************************************************/

void unix_timespec_to_nt_time(NTTIME *nt, struct timespec ts)
{
      uint64 d;

      if (ts.tv_sec ==0 && ts.tv_nsec == 0) {
            *nt = 0;
            return;
      }
      if (ts.tv_sec == TIME_T_MAX) {
            *nt = 0x7fffffffffffffffLL;
            return;
      }           
      if (ts.tv_sec == (time_t)-1) {
            *nt = (uint64)-1;
            return;
      }           

      d = ts.tv_sec;
      d += TIME_FIXUP_CONSTANT_INT;
      d *= 1000*1000*10;
      /* d is now in 100ns units. */
      d += (ts.tv_nsec / 100);

      *nt = d;
}

/****************************************************************************
 Convert a time_t to a NTTIME structure

 This is an absolute version of the one above.
 By absolute I mean, it doesn't adjust from 1/1/1970 to 1/1/1601
 If the time_t was 5 seconds, the NTTIME is 5 seconds. JFM
****************************************************************************/

void unix_to_nt_time_abs(NTTIME *nt, time_t t)
{
      double d;

      if (t==0) {
            *nt = 0;
            return;
      }

      if (t == TIME_T_MAX) {
            *nt = 0x7fffffffffffffffLL;
            return;
      }
            
      if (t == (time_t)-1) {
            /* that's what NT uses for infinite */
            *nt = NTTIME_INFINITY;
            return;
      }           

      d = (double)(t);
      d *= 1.0e7;

      *nt = (NTTIME)d;

      /* convert to a negative value */
      *nt=~*nt;
}


/****************************************************************************
 Check if it's a null mtime.
****************************************************************************/

bool null_mtime(time_t mtime)
{
      if (mtime == 0 || mtime == (time_t)0xFFFFFFFF || mtime == (time_t)-1)
            return(True);
      return(False);
}

/****************************************************************************
 Utility function that always returns a const string even if localtime
 and asctime fail.
****************************************************************************/

const char *time_to_asc(const time_t t)
{
      const char *asct;
      struct tm *lt = localtime(&t);

      if (!lt) {
            return "unknown time";
      }

      asct = asctime(lt);
      if (!asct) {
            return "unknown time";
      }
      return asct;
}

const char *display_time(NTTIME nttime)
{
      float high;
      float low;
      int sec;
      int days, hours, mins, secs;

      if (nttime==0)
            return "Now";

      if (nttime==NTTIME_INFINITY)
            return "Never";

      high = 65536;     
      high = high/10000;
      high = high*65536;
      high = high/1000;
      high = high * (~(nttime >> 32));

      low = ~(nttime & 0xFFFFFFFF);
      low = low/(1000*1000*10);

      sec=(int)(high+low);

      days=sec/(60*60*24);
      hours=(sec - (days*60*60*24)) / (60*60);
      mins=(sec - (days*60*60*24) - (hours*60*60) ) / 60;
      secs=sec - (days*60*60*24) - (hours*60*60) - (mins*60);

      return talloc_asprintf(talloc_tos(), "%u days, %u hours, %u minutes, "
                         "%u seconds", days, hours, mins, secs);
}

bool nt_time_is_set(const NTTIME *nt)
{
      if (*nt == 0x7FFFFFFFFFFFFFFFLL) {
            return False;
      }

      if (*nt == NTTIME_INFINITY) {
            return False;
      }

      return True;
}

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