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476 lines
12 KiB
476 lines
12 KiB
//=============================================================================
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// File: datetime.cpp
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// Contents: Definitions for DwDateTime
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// Maintainer: Doug Sauder <dwsauder@fwb.gulf.net>
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// WWW: http://www.fwb.gulf.net/~dwsauder/mimepp.html
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//
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// Copyright (c) 1996, 1997 Douglas W. Sauder
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// All rights reserved.
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//
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// IN NO EVENT SHALL DOUGLAS W. SAUDER BE LIABLE TO ANY PARTY FOR DIRECT,
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// INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
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// THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF DOUGLAS W. SAUDER
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// HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// DOUGLAS W. SAUDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT
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// NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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// PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
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// BASIS, AND DOUGLAS W. SAUDER HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
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// SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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//
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//=============================================================================
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#define DW_IMPLEMENTATION
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#ifdef HAVE_CONFIG_H
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#include "../config.h"
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#endif
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#include <mimelib/config.h>
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#include <mimelib/debug.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <mimelib/string.h>
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#include <mimelib/datetime.h>
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#include <mimelib/token.h>
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#include <time.h>
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static char lWeekDay[7][4]
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= {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
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static char lMonth[12][4]
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= {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
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extern "C" int ParseRfc822Date(const char *str, struct tm *tms, int *z);
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extern "C" int ParseDate(const char *str, struct tm *tms, int *z);
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static DwInt32 ymd_to_jdnl(int year, int mon, int day, int julian);
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static void jdnl_to_ymd(DwInt32 jdn, int *year, int *mon, int *day, int julian);
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static DwUint32 my_inv_gmtime(struct tm* ptms);
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const char* const DwDateTime::sClassName = "DwDateTime";
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int DwDateTime::sDefaultZone = 0;
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int DwDateTime::sIsDefaultZoneSet = 0;
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DwDateTime* (*DwDateTime::sNewDateTime)(const DwString&,
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DwMessageComponent*) = 0;
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DwDateTime* DwDateTime::NewDateTime(const DwString& aStr,
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DwMessageComponent* aParent)
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{
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if (sNewDateTime) {
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return sNewDateTime(aStr, aParent);
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}
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else {
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return new DwDateTime(aStr, aParent);
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}
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}
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void DwDateTime::SetDefaultZone(int aZone)
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{
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sDefaultZone = aZone;
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sIsDefaultZoneSet = 1;
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}
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DwDateTime::DwDateTime()
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{
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Init();
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mIsModified = 1;
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}
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DwDateTime::DwDateTime(const DwDateTime& aDateTime)
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: DwFieldBody(aDateTime)
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{
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mYear = aDateTime.mYear;
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mMonth = aDateTime.mMonth;
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mDay = aDateTime.mDay;
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mHour = aDateTime.mHour;
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mMinute = aDateTime.mMinute;
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mSecond = aDateTime.mSecond;
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mZone = aDateTime.mZone;
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}
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DwDateTime::DwDateTime(const DwString& aStr, DwMessageComponent* aParent)
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: DwFieldBody(aStr, aParent)
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{
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Init();
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mIsModified = 0;
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}
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void DwDateTime::Init()
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{
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mClassId = kCidDateTime;
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mClassName = DwDateTime::sClassName;
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// Check if default time zone is set
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if (sIsDefaultZoneSet == 0) {
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// Use calls to gmtime() and localtime() to get the time difference
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// between local time and UTC (GMT) time.
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time_t t_now = time((time_t*) 0);
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#if defined(HAVE_GMTIME_R)
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struct tm utc;
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gmtime_r(&t_now, &utc);
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struct tm local;
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localtime_r(&t_now, &local);
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#else
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struct tm utc = *gmtime(&t_now);
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struct tm local = *localtime(&t_now);
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#endif
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DwUint32 t_local = my_inv_gmtime(&local);
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DwUint32 t_utc = my_inv_gmtime(&utc);
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sDefaultZone = (int) (t_local - t_utc)/60;
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// do not flag this as it would never check the zone again, which
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// would lead to wrong timediff on the DST/non-DST day change
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//sIsDefaultZoneSet = 1;
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}
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// Set the time zone from the default time zone
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mZone = sDefaultZone;
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// Get the current calendar time
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time_t t_now = time((time_t*) 0);
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// Set year, month, day, hour, minute, and second from calendar time
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_FromCalendarTime(t_now);
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}
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DwDateTime::~DwDateTime()
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{
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}
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const DwDateTime& DwDateTime::operator = (const DwDateTime& aDateTime)
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{
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if (this == &aDateTime) return *this;
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DwFieldBody::operator = (aDateTime);
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mYear = aDateTime.mYear;
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mMonth = aDateTime.mMonth;
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mDay = aDateTime.mDay;
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mHour = aDateTime.mHour;
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mMinute = aDateTime.mMinute;
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mSecond = aDateTime.mSecond;
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mZone = aDateTime.mZone;
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return *this;
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}
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DwUint32 DwDateTime::AsUnixTime() const
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{
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struct tm tt;
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tt.tm_year = mYear - 1900;
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tt.tm_mon = mMonth - 1;
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tt.tm_mday = mDay;
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tt.tm_hour = mHour;
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tt.tm_min = mMinute;
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tt.tm_sec = mSecond;
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DwUint32 t = my_inv_gmtime(&tt);
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t = (t == (DwUint32) -1) ? 0 : t;
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t -= mZone*60;
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return t;
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}
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void DwDateTime::FromUnixTime(DwUint32 aTime)
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{
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_FromUnixTime(aTime);
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SetModified();
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}
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void DwDateTime::_FromUnixTime(DwUint32 aTime)
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{
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time_t t = aTime + mZone*60;
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#if defined(HAVE_GMTIME_R)
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struct tm tt;
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gmtime_r(&t, &tt);
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#else
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struct tm tt = *gmtime(&t);
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#endif
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mYear = tt.tm_year + 1900;
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mMonth = tt.tm_mon + 1;
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mDay = tt.tm_mday;
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mHour = tt.tm_hour;
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mMinute = tt.tm_min;
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mSecond = tt.tm_sec;
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}
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void DwDateTime::FromCalendarTime(time_t aTime)
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{
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_FromCalendarTime(aTime);
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SetModified();
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}
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void DwDateTime::_FromCalendarTime(time_t aTime)
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{
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// Note: the broken-down time is the only portable representation.
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// ANSI does not even require that time_t be an integer type; it could
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// be a double. And, it doesn't even have to be in seconds.
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// Get the broken-down time.
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#if defined(HAVE_GMTIME_R)
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struct tm tms_utc;
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gmtime_r(&aTime, &tms_utc);
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#else
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struct tm tms_utc = *gmtime(&aTime);
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#endif
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// Convert to UNIX time, using portable routine
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DwUint32 t_unix = my_inv_gmtime(&tms_utc);
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// Set from the UNIX time
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_FromUnixTime(t_unix);
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}
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DwInt32 DwDateTime::DateAsJulianDayNum() const
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{
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DwInt32 jdn = ymd_to_jdnl(mYear, mMonth, mDay, -1);
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return jdn;
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}
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void DwDateTime::DateFromJulianDayNum(DwInt32 aJdn)
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{
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jdnl_to_ymd(aJdn, &mYear, &mMonth, &mDay, -1);
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SetModified();
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}
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DwInt32 DwDateTime::TimeAsSecsPastMidnight() const
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{
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DwInt32 n = mHour;
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n *= 60;
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n += mMinute;
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n *= 60;
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n += mSecond;
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return n;
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}
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void DwDateTime::TimeFromSecsPastMidnight(DwInt32 aSecs)
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{
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mSecond = (int) (aSecs % 60);
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aSecs /= 60;
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mMinute = (int) (aSecs % 60);
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aSecs /= 60;
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mHour = (int) (aSecs % 24);
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SetModified();
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}
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void DwDateTime::Parse()
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{
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mIsModified = 0;
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char buffer[80];
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char *str;
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int mustDelete;
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// Allocate memory from heap only in rare instances where the buffer
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// is too small.
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if (mString.length() >= 80) {
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mustDelete = 1;
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str = new char [mString.length()+1];
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}
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else {
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mustDelete = 0;
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str = buffer;
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}
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strncpy(str, mString.data(), mString.length());
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str[mString.length()] = 0;
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str[79] = 0;
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struct tm tms;
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int zone;
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int err = ParseRfc822Date(str, &tms, &zone);
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if ( err == -1 ) // try another format
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err = ParseDate(str, &tms, &zone);
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if (!err) {
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mYear = tms.tm_year + 1900;
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mMonth = tms.tm_mon+1;
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mDay = tms.tm_mday;
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mHour = tms.tm_hour;
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mMinute = tms.tm_min;
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mSecond = tms.tm_sec;
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mZone = zone;
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}
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else /* if (err) */ {
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mYear = 1970;
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mMonth = 1;
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mDay = 1;
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mHour = 0;
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mMinute = 0;
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mSecond = 0;
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mZone = 0;
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}
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if (mustDelete) {
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delete[] str;
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}
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}
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void DwDateTime::Assemble()
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{
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if (!mIsModified) return;
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// Find the day of the week
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DwInt32 jdn = DateAsJulianDayNum();
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int dow = (int) ((jdn+1)%7);
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char sgn = (mZone < 0) ? '-' : '+';
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int z = (mZone < 0) ? -mZone : mZone;
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char buffer[80];
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snprintf(buffer, sizeof(buffer), "%s, %d %s %4d %02d:%02d:%02d %c%02d%02d",
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lWeekDay[dow], mDay, lMonth[(mMonth-1)%12], mYear,
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mHour, mMinute, mSecond, sgn, z/60%24, z%60);
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mString = buffer;
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mIsModified = 0;
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}
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DwMessageComponent* DwDateTime::Clone() const
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{
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return new DwDateTime(*this);
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}
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#if defined (DW_DEBUG_VERSION)
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void DwDateTime::PrintDebugInfo(std::ostream& aStrm, int /*aDepth*/) const
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{
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aStrm <<
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"---------------- Debug info for DwDateTime class ---------------\n";
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_PrintDebugInfo(aStrm);
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}
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#else
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void DwDateTime::PrintDebugInfo(std::ostream& , int) const {}
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#endif // defined (DW_DEBUG_VERSION)
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#if defined (DW_DEBUG_VERSION)
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void DwDateTime::_PrintDebugInfo(std::ostream& aStrm) const
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{
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DwFieldBody::_PrintDebugInfo(aStrm);
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aStrm << "Date: "
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<< mYear << '-' << mMonth << '-' << mDay << ' '
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<< mHour << ':' << mMinute << ':' << mSecond << ' '
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<< mZone << '\n';
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}
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#else
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void DwDateTime::_PrintDebugInfo(std::ostream& ) const {}
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#endif // defined (DW_DEBUG_VERSION)
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void DwDateTime::CheckInvariants() const
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{
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#if defined (DW_DEBUG_VERSION)
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DwFieldBody::CheckInvariants();
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assert(mYear >= 0);
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assert(1 <= mMonth && mMonth <= 12);
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assert(1 <= mDay && mDay <= 31);
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assert(0 <= mHour && mHour < 24);
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assert(0 <= mMinute && mMinute < 60);
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assert(0 <= mSecond && mSecond < 60);
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assert(-12*60 <= mZone && mZone <= 12*60);
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#endif // defined (DW_DEBUG_VERSION)
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}
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#ifdef PAPAL /* Pope Gregory XIII's decree */
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#define LASTJULDATE 15821004L /* last day to use Julian calendar */
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#define LASTJULJDN 2299160L /* jdn of same */
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#else /* British-American usage */
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#define LASTJULDATE 17520902L /* last day to use Julian calendar */
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#define LASTJULJDN 2361221L /* jdn of same */
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#endif
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static DwInt32 ymd_to_jdnl(int year, int mon, int day, int julian)
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{
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DwInt32 jdn;
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if (julian < 0) /* set Julian flag if auto set */
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julian = (((year * 100L) + mon) * 100 + day <= LASTJULDATE);
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if (year < 0) /* adjust BC year */
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year++;
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if (julian)
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jdn = 367L * year - 7 * (year + 5001L + (mon - 9) / 7) / 4
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+ 275 * mon / 9 + day + 1729777L;
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else
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jdn = (DwInt32)(day - 32075)
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+ 1461L * (year + 4800L + (mon - 14) / 12) / 4
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+ 367 * (mon - 2 - (mon - 14) / 12 * 12) / 12
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- 3 * ((year + 4900L + (mon - 14) / 12) / 100) / 4;
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return jdn;
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}
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static void jdnl_to_ymd(DwInt32 jdn, int *year, int *mon, int *day, int julian)
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{
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DwInt32 x, z, m, d, y;
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DwInt32 daysPer400Years = 146097L;
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DwInt32 fudgedDaysPer4000Years = 1460970L + 31;
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if (julian < 0) /* set Julian flag if auto set */
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julian = (jdn <= LASTJULJDN);
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x = jdn + 68569L;
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if (julian) {
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x += 38;
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daysPer400Years = 146100L;
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fudgedDaysPer4000Years = 1461000L + 1;
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}
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z = 4 * x / daysPer400Years;
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x = x - (daysPer400Years * z + 3) / 4;
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y = 4000 * (x + 1) / fudgedDaysPer4000Years;
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x = x - 1461 * y / 4 + 31;
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m = 80 * x / 2447;
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d = x - 2447 * m / 80;
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x = m / 11;
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m = m + 2 - 12 * x;
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y = 100 * (z - 49) + y + x;
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*year = (int)y;
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*mon = (int)m;
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*day = (int)d;
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if (*year <= 0) /* adjust BC years */
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(*year)--;
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}
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#define JDN_JAN_1_1970 2440588L
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/*
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* Converts broken-down time to time in seconds since 1 Jan 1970 00:00.
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* Pays no attention to time zone or daylight savings time. Another way
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* to think about this function is that it is the inverse of gmtime().
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* One word of caution: the values in the broken down time must be
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* correct.
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*
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* This function is different from mktime() in three ways:
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* 1. mktime() accepts a broken-down local time and converts it to a scalar
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* UTC time. Thus, mktime() takes time zone and daylight savings time
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* information into account when computing the scalar time. (This makes
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* mktime() highly non-portable).
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* 2. mktime() will adjust for non-standard values, such as a tm_mday member
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* that is out of range. This function does no such conversion.
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* 3. mktime() sets the struct fields tm_yday, tm_wday, and tm_isdst to
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* their correct values on output. This function does not.
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*/
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static DwUint32 my_inv_gmtime(struct tm* ptms)
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{
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DwInt32 jdn;
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DwUint32 t;
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jdn = ymd_to_jdnl(ptms->tm_year+1900, ptms->tm_mon+1,
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ptms->tm_mday, -1);
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t = jdn - JDN_JAN_1_1970; /* days */
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t = 24*t + ptms->tm_hour; /* hours */
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t = 60*t + ptms->tm_min; /* minutes */
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t = 60*t + ptms->tm_sec; /* seconds */
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return t;
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}
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