ptime.cxx

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/*
 * ptime.cxx
 *
 * Time and date classes.
 *
 * Portable Windows Library
 *
 * Copyright (c) 1993-1998 Equivalence Pty. Ltd.
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is Portable Windows Library.
 *
 * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
 *
 * Portions are Copyright (C) 1993 Free Software Foundation, Inc.
 * All Rights Reserved.
 *
 * Contributor(s): ______________________________________.
 *
 * $Log: ptime.cxx,v $
 * Revision 1.35  2000/04/29 08:11:06  robertj
 * Fixed problem with stream output width in PTimeInterval
 *
 * Revision 1.34  2000/04/29 04:50:16  robertj
 * Added microseconds to string output.
 * Fixed uninitialised microseconds on some constructors.
 *
 * Revision 1.33  2000/04/28 13:23:25  robertj
 * Fixed printing of negative time intervals.
 *
 * Revision 1.32  2000/04/18 06:01:01  robertj
 * Fixed integer overflow bug in PTime addition functions, thanks Ian MacDonald
 *
 * Revision 1.31  2000/04/05 02:50:17  robertj
 * Added microseconds to PTime class.
 *
 * Revision 1.30  2000/03/08 17:56:33  rogerh
 * Fix error in creation of a PStringStream from a PString
 *
 * Revision 1.29  2000/03/06 04:09:23  robertj
 * Added constructor to do PString conversion to PTimeInterval
 *
 * Revision 1.28  1999/10/14 08:23:20  robertj
 * Fixed display of decimals in milliseconds when precision other than 3.
 *
 * Revision 1.27  1999/08/08 12:39:24  robertj
 * Fixed bug in display of PTimeIntervals larger than 24 hours.
 *
 * Revision 1.26  1999/06/14 07:58:39  robertj
 * Fixed bug in PTimeInteerval output, left stream fill char as '0'.
 * Added ability to set the width of the PTimeInterval stream output.
 *
 * Revision 1.25  1999/03/29 03:38:58  robertj
 * Improved time & date parser.
 *
 * Revision 1.24  1998/11/30 12:31:46  robertj
 * Removed redundent conditionals.
 *
 * Revision 1.23  1998/11/14 01:11:45  robertj
 * PPC linux GNU compatibility.
 *
 * Revision 1.22  1998/09/23 06:22:36  robertj
 * Added open source copyright license.
 *
 * Revision 1.21  1998/03/05 12:49:53  robertj
 * MemCheck fixes.
 *
 * Revision 1.20  1998/01/26 00:48:30  robertj
 * Removed days from PTimeInterval PrintOn(), can get it back by using negative precision.
 * Fixed Y2K problem in parsing dates.
 *
 * Revision 1.19  1998/01/04 07:24:32  robertj
 * Added operating system specific versions of gmtime and localtime.
 *
 * Revision 1.18  1997/07/08 13:05:21  robertj
 * Fixed bug in parsing time zone incorrectly.
 *
 * Revision 1.17  1997/05/16 12:05:57  robertj
 * Changed PTimeInterval to guarentee no overflow in millisecond calculations.
 *
 * Revision 1.16  1997/03/18 21:24:19  robertj
 * Fixed parsing of time putting back token after time zone.
 *
 * Revision 1.15  1997/01/03 04:40:03  robertj
 * Changed default time so if no year goes to last 12 months rather than current year.
 *
 * Revision 1.14  1996/10/26 01:40:12  robertj
 * Fixed bug in time parser that caused endless looping.
 *
 * Revision 1.13  1996/08/20 12:07:29  robertj
 * Fixed volatile milliseconds member of PTimeInterval for printing.
 *
 * Revision 1.12  1996/07/27 04:11:28  robertj
 * Added bullet proofing for invlid times - especially in Western time zones.
 *
 * Revision 1.11  1996/07/15 12:43:01  robertj
 * Fixed MSVC 4.1 compiler bug.
 *
 * Revision 1.10  1996/06/17 11:34:48  robertj
 * Fixed bug in NOT localising RFC1123 time.
 *
 * Revision 1.9  1996/05/09 12:18:16  robertj
 * Fixed syntax error found by Mac platform.
 * Resolved C++ problems with 64 bit PTimeInterval for Mac platform.
 *
 * Revision 1.8  1996/03/17 05:43:42  robertj
 * Changed PTimeInterval to 64 bit integer.
 *
 * Revision 1.7  1996/03/05 14:09:20  robertj
 * Fixed bugs in PTimerInterval stream output.
 *
 * Revision 1.6  1996/03/04 12:21:42  robertj
 * Fixed output of leading zeros in PTimeInterval stream output.
 *
 * Revision 1.5  1996/02/25 11:22:13  robertj
 * Added check for precision field in stream when outputting time interval..
 *
 * Revision 1.4  1996/02/25 03:07:47  robertj
 * Changed PrintOn and ReadFrom on PTimeInterval to use dd:hh:mm:ss.mmm format.
 *
 * Revision 1.3  1996/02/15 14:47:35  robertj
 * Fixed bugs in time zone compensation (some in the C library).
 *
 * Revision 1.2  1996/02/13 12:59:32  robertj
 * Changed GetTimeZone() so can specify standard/daylight time.
 * Split PTime into separate module after major change to ReadFrom().
 *
 * Revision 1.1  1996/02/13 10:11:52  robertj
 * Initial revision
 *
 */

#include <ptlib.h>
#include <ctype.h>

///////////////////////////////////////////////////////////////////////////////
// PTimeInterval

PTimeInterval::PTimeInterval(long millisecs,
                             long seconds,
                             long minutes,
                             long hours,
                             int days)
{
  SetInterval(millisecs, seconds, minutes, hours, days);
}


PTimeInterval::PTimeInterval(const PString & str)
{
  PStringStream strm(str);
  ReadFrom(strm);
}


PObject::Comparison PTimeInterval::Compare(const PObject & obj) const
{
  PAssert(obj.IsDescendant(PTimeInterval::Class()), PInvalidCast);
  const PTimeInterval & other = (const PTimeInterval &)obj;
  return milliseconds < other.milliseconds ? LessThan :
         milliseconds > other.milliseconds ? GreaterThan : EqualTo;
}


void PTimeInterval::PrintOn(ostream & stream) const
{
  int width = stream.width();

  int precision = stream.precision();
  if (precision > 3)
    precision = 3;

  BOOL hadPrevious = FALSE;
  long tmp;

  PStringStream str;
  str.fill('0');

  PInt64 ms = milliseconds;
  if (ms < 0) {
    str << '-';
    ms = -ms;
  }

  if (precision < 0) {
    precision = -precision;
    if (precision > 3)
      precision = 3;

    tmp = (long)(ms/86400000);
    if (tmp > 0 || width > (precision+10)) {
      str << tmp << 'd';
      hadPrevious = TRUE;
    }

    tmp = (long)(ms%86400000)/3600000;
  }
  else
    tmp = (long)(ms/3600000);

  if (hadPrevious || tmp > 0 || width > (precision+7)) {
    if (hadPrevious)
      str.width(2);
    str << tmp << ':';
    hadPrevious = TRUE;
  }

  tmp = (long)(ms%3600000)/60000;
  if (hadPrevious || tmp > 0 || width > (precision+4)) {
    if (hadPrevious)
      str.width(2);
    str << tmp << ':';
    hadPrevious = TRUE;
  }

  if (hadPrevious)
    str.width(2);
  str << (long)(ms%60000)/1000;

  switch (precision) {
    case 1 :
      str << '.' << (int)(ms%1000)/100;
      break;

    case 2 :
      str << '.' << setw(2) << (int)(ms%1000)/10;
      break;

    case 3 :
      str << '.' << setw(3) << (int)(ms%1000);

    default :
      break;
  }

  stream << str;
}


void PTimeInterval::ReadFrom(istream &strm)
{
  long day = 0;
  long hour = 0;
  long min = 0;
  float sec;
  strm >> sec;
  while (strm.peek() == ':') {
    day = hour;
    hour = min;
    min = (long)sec;
    strm.get();
    strm >> sec;
  }

  SetInterval(((long)(sec*1000))%1000, (int)sec, min, hour, day);
}


void PTimeInterval::SetInterval(PInt64 millisecs,
                                long seconds,
                                long minutes,
                                long hours,
                                int days)
{
  milliseconds = days;
  milliseconds *= 24;
  milliseconds += hours;
  milliseconds *= 60;
  milliseconds += minutes;
  milliseconds *= 60;
  milliseconds += seconds;
  milliseconds *= 1000;
  milliseconds += millisecs;
}


///////////////////////////////////////////////////////////////////////////////
// PTime

static time_t p_mktime(struct tm * t, int zone)
{
  // mktime returns GMT, calculated using input_time - timezone. However, this
  // assumes that the input time was a local time. If the input time wasn't a
  // local time, then we have have to add the local timezone (without daylight
  // savings) and subtract the specified zone offset to get GMT
  // and then subtract
  t->tm_isdst = PTime::IsDaylightSavings() ? 1 : 0;
  time_t theTime = mktime(t);
  if (theTime == (time_t)-1)
    theTime = 0;
  else if (zone != PTime::Local) {
    theTime += PTime::GetTimeZone()*60;  // convert to local time
    if (theTime > zone*60)
      theTime -= zone*60;           // and then to GMT
  }
  return theTime;
}


PTime::PTime(const PString & str)
{
  PStringStream s(str);
  ReadFrom(s);
}


PTime::PTime(int second, int minute, int hour,
             int day,    int month,  int year,
             int zone)
{
  microseconds = 0;

  struct tm t;
  PAssert(second >= 0 && second <= 59, PInvalidParameter);
  t.tm_sec = second;
  PAssert(minute >= 0 && minute <= 59, PInvalidParameter);
  t.tm_min = minute;
  PAssert(hour >= 0 && hour <= 23, PInvalidParameter);
  t.tm_hour = hour;
  PAssert(day >= 1 && day <= 31, PInvalidParameter);
  t.tm_mday = day;
  PAssert(month >= 1 && month <= 12, PInvalidParameter);
  t.tm_mon = month-1;
  PAssert(year >= 1970 && year <= 2038, PInvalidParameter);
  t.tm_year   = year-1900;

  theTime = p_mktime(&t, zone);
}


PObject::Comparison PTime::Compare(const PObject & obj) const
{
  PAssert(obj.IsDescendant(PTime::Class()), PInvalidCast);
  const PTime & other = (const PTime &)obj;
  if (theTime < other.theTime)
    return LessThan;
  if (theTime > other.theTime)
    return GreaterThan;
  if (microseconds < other.microseconds)
    return LessThan;
  if (microseconds > other.microseconds)
    return GreaterThan;
  return EqualTo;
}




PString PTime::AsString(TimeFormat format, int zone) const
{
  if (format == RFC1123)
    return AsString("wwwe, dd MMME yyyy hh:mm:ss z", zone);