time.c

MC Linux/Unix 终端下文件管理器

  return(ret);
}



/****************************************************************************
interprets an nt time into a unix time_t
****************************************************************************/
time_t interpret_long_date(char *p)
{
	NTTIME nt;
	nt.low = IVAL(p,0);
	nt.high = IVAL(p,4);
	return nt_time_to_unix(&nt);
}

/****************************************************************************
put a 8 byte filetime from a time_t
This takes real GMT as input and converts to kludge-GMT
****************************************************************************/
void unix_to_nt_time(NTTIME *nt, time_t t)
{
	double d;

	if (t==0)
	{
		nt->low = 0;
		nt->high = 0;
		return;
	}

	/* this converts GMT to kludge-GMT */
	t -= LocTimeDiff(t) - serverzone; 

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

	nt->high = (uint32)(d * (1.0/(4.0*(double)(1<<30))));
	nt->low  = (uint32)(d - ((double)nt->high)*4.0*(double)(1<<30));
}


/****************************************************************************
take an NTTIME structure, containing high / low time.  convert to unix time.
lkclXXXX this may need 2 SIVALs not a memcpy.  we'll see...
****************************************************************************/
void put_long_date(char *p,time_t t)
{
	NTTIME nt;
	unix_to_nt_time(&nt, t);
	SIVAL(p, 0, nt.low);
	SIVAL(p, 4, nt.high);
}

/****************************************************************************
check if it's a null mtime
****************************************************************************/
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(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(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);
  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
********************************************************************/
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));
#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(void )
{
	static fstring TimeBuf;
	time_t t = time(NULL);
	struct tm *tm = LocalTime(&t);

	if (!tm) {
		slprintf(TimeBuf,sizeof(TimeBuf)-1,"%ld seconds since the Epoch",(long)t);
	} else {
#ifdef HAVE_STRFTIME
		strftime(TimeBuf,100,"%Y/%m/%d %H:%M:%S",tm);
#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;
}