434 lines
12 KiB
C
434 lines
12 KiB
C
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#include "ctlspriv.h"
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#include "scdttime.h"
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// BUGBUG? remove references to 1750 and 1752 as they
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// are not needed -- the minimal year we allow is 1753
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// to avoid such problems. (We don't care about
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// pre-revised-Gregorian dates! If you want to develop
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// a history application, then you can deal with these problems)
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int mpcdymoAccum[13] =
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{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
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/*
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- LIncrWord
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-
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* Purpose:
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* Increment (or decrement) an integer by a specified amount,
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* given the constraints nMic and nMac.
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* Returns the amount of carry into the following (or preceding)
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* field, or zero if none.
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*
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* Intended for use with incrementing date/times.
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*
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* Arguments:
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* pn Pointer to integer to be modified.
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* nDelta Amount by which to modify *pn; may be positive,
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* negative or zero.
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* nMic Minimum value for *pn; if decrementing below this,
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* a carry is performed.
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* nMac Maximum value for *pn; if incrementing above this,
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* a carry is performed.
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*
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* Returns:
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* Zero if modification done within constraints, otherwise the
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* amount of carry (positive in incrementing, negative if
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* decrementing).
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*
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*/
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LONG LIncrWord(WORD *pn, LONG nDelta, int nMic, int nMac)
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{
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LONG lNew, lIncr;
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lIncr = 0;
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lNew = *pn + nDelta;
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while (lNew >= nMac)
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{
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lNew -= nMac - nMic;
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lIncr++;
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}
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if (!lIncr)
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{
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while (lNew < nMic)
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{
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lNew += nMac - nMic;
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lIncr--;
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}
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}
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*pn = (WORD)lNew;
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return(lIncr);
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}
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void IncrSystemTime(SYSTEMTIME *pstSrc, SYSTEMTIME *pstDest, LONG nDelta, LONG flag)
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{
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int cdyMon;
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if (pstSrc != pstDest)
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*pstDest = *pstSrc;
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switch (flag)
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{
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case INCRSYS_SECOND:
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if (!(nDelta = LIncrWord(&pstDest->wSecond, nDelta, 0, 60)))
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break;
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case INCRSYS_MINUTE:
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if (!(nDelta = LIncrWord(&pstDest->wMinute, nDelta, 0, 60)))
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break;
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case INCRSYS_HOUR:
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if (!(nDelta = LIncrWord(&pstDest->wHour, nDelta, 0, 24)))
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break;
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case INCRSYS_DAY:
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IDTday:
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if (nDelta >= 0)
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{
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cdyMon = GetDaysForMonth(pstDest->wYear, pstDest->wMonth);
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while (pstDest->wDay + nDelta > cdyMon)
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{
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nDelta -= cdyMon + 1 - pstDest->wDay;
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pstDest->wDay = 1;
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IncrSystemTime(pstDest, pstDest, 1, INCRSYS_MONTH);
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cdyMon = GetDaysForMonth(pstDest->wYear, pstDest->wMonth);
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}
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}
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else
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{
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while (pstDest->wDay <= -nDelta)
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{
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nDelta += pstDest->wDay;
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IncrSystemTime(pstDest, pstDest, -1, INCRSYS_MONTH);
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cdyMon = GetDaysForMonth(pstDest->wYear, pstDest->wMonth);
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pstDest->wDay = (WORD) cdyMon;
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}
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}
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pstDest->wDay += (WORD)nDelta;
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break;
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case INCRSYS_MONTH:
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if (!(nDelta = LIncrWord(&pstDest->wMonth, nDelta, 1, 13)))
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{
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cdyMon = GetDaysForMonth(pstDest->wYear, pstDest->wMonth);
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if (pstDest->wDay > cdyMon)
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pstDest->wDay = (WORD) cdyMon;
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break;
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}
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case INCRSYS_YEAR:
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pstDest->wYear += (WORD)nDelta;
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cdyMon = GetDaysForMonth(pstDest->wYear, pstDest->wMonth);
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if (pstDest->wDay > cdyMon)
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pstDest->wDay = (WORD) cdyMon;
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break;
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case INCRSYS_WEEK:
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nDelta *= 7;
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goto IDTday;
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break;
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}
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}
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CmpDate(const SYSTEMTIME *pst1, const SYSTEMTIME *pst2)
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{
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int iRet;
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if (pst1->wYear < pst2->wYear)
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iRet = -1;
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else if (pst1->wYear > pst2->wYear)
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iRet = 1;
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else if (pst1->wMonth < pst2->wMonth)
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iRet = -1;
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else if (pst1->wMonth > pst2->wMonth)
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iRet = 1;
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else if (pst1->wDay < pst2->wDay)
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iRet = -1;
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else if (pst1->wDay > pst2->wDay)
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iRet = 1;
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else
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iRet = 0;
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return(iRet);
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}
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CmpSystemtime(const SYSTEMTIME *pst1, const SYSTEMTIME *pst2)
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{
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int iRet;
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if (pst1->wYear < pst2->wYear)
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iRet = -1;
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else if (pst1->wYear > pst2->wYear)
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iRet = 1;
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else if (pst1->wMonth < pst2->wMonth)
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iRet = -1;
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else if (pst1->wMonth > pst2->wMonth)
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iRet = 1;
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else if (pst1->wDay < pst2->wDay)
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iRet = -1;
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else if (pst1->wDay > pst2->wDay)
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iRet = 1;
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else if (pst1->wHour < pst2->wHour)
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iRet = -1;
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else if (pst1->wHour > pst2->wHour)
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iRet = 1;
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else if (pst1->wMinute < pst2->wMinute)
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iRet = -1;
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else if (pst1->wMinute > pst2->wMinute)
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iRet = 1;
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else if (pst1->wSecond < pst2->wSecond)
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iRet = -1;
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else if (pst1->wSecond > pst2->wSecond)
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iRet = 1;
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else
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iRet = 0;
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return(iRet);
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}
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/*
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- CdyBetweenYmd
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-
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* Purpose:
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* Calculate the number of days between two dates as expressed
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* in YMD's.
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*
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* Parameters:
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* pymdStart start day of range.
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* pymdEnd end day of range.
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*
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* Returns:
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* Number of days between two dates. The number
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* of days does not include the starting day, but does include
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* the last day. ie 1/24/1990-1/25/1990 = 1 day.
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*/
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DWORD DaysBetweenDates(const SYSTEMTIME *pstStart, const SYSTEMTIME *pstEnd)
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{
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DWORD cday;
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WORD yr;
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// Calculate number of days between the start month/day and the
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// end month/day as if they were in the same year - since cday
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// is unsigned, cday could be really large if the end month/day
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// is before the start month.day.
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// This will be cleared up when we account for the days between
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// the years.
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ASSERT(pstEnd->wMonth >= 1 && pstEnd->wMonth <= 12);
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cday = mpcdymoAccum[pstEnd->wMonth - 1] - mpcdymoAccum[pstStart->wMonth - 1] +
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pstEnd->wDay - pstStart->wDay;
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yr = pstStart->wYear;
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// Check to see if the start year is before the end year,
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// and if the end month is after February and
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// if the end year is a leap year, then add an extra day
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// for to account for Feb. 29 in the end year.
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if ( ((yr < pstEnd->wYear) || (pstStart->wMonth <= 2)) &&
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pstEnd->wMonth > 2 &&
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(pstEnd->wYear & 03) == 0 &&
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(pstEnd->wYear <= 1750 || pstEnd->wYear % 100 != 0 || pstEnd->wYear % 400 == 0))
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{
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cday++;
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}
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// Now account for the leap years in between the start and end dates
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// as well as accounting for the days in each year.
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if (yr < pstEnd->wYear)
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{
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// If the start date is before march and the start year is
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// a leap year then add an extra day to account for Feb. 29.
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if ( pstStart->wMonth <= 2 &&
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(yr & 03) == 0 &&
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(yr <= 1750 || yr % 100 != 0 || yr % 400 == 0))
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{
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cday++;
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}
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// Account for the days in each year (disregarding leap years).
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cday += 365;
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yr++;
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// Keep on accounting for the days in each year including leap
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// years until we reach the end year.
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while (yr < pstEnd->wYear)
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{
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cday += 365;
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if ((yr & 03) == 0 && (yr <= 1750 || yr % 100 != 0 || yr % 400 == 0))
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cday++;
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yr++;
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}
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}
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return(cday);
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}
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/*
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- DowStartOfYrMo
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-
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* Purpose:
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* Find the day of the week the indicated month begins on
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*
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* Parameters:
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* yr year, must be > 0
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* mo month, number 1-12
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*
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* Returns:
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* day of the week (0-6) on which the month begins
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* (0 = Sunday, 1 = Monday etc.)
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*/
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int GetStartDowForMonth(int yr, int mo)
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{
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int dow;
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// we want monday = 0, sunday = 6
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// dow = 6 + (yr - 1) + ((yr - 1) >> 2);
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dow = 5 + (yr - 1) + ((yr - 1) >> 2);
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if (yr > 1752)
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dow += ((yr - 1) - 1600) / 400 - ((yr - 1) - 1700) / 100 - 11;
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else if (yr == 1752 && mo > 9)
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dow -= 11;
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dow += mpcdymoAccum[mo - 1];
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if (mo > 2 && (yr & 03) == 0 && (yr <= 1750 || yr % 100 != 0 || yr % 400 == 0))
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dow++;
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dow %= 7;
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return(dow);
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}
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int DowFromDate(const SYSTEMTIME *pst)
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{
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int dow;
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dow = GetStartDowForMonth(pst->wYear, pst->wMonth);
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dow = (dow + pst->wDay - 1) % 7;
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return(dow);
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}
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int GetDaysForMonth(int yr, int mo)
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{
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int cdy;
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if (yr == 1752 && mo == 9)
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return(19);
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cdy = mpcdymoAccum[mo] - mpcdymoAccum[mo - 1];
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if (mo == 2 && (yr & 03) == 0 && (yr <= 1750 || yr % 100 != 0 || yr % 400 == 0))
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cdy++;
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return(cdy);
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}
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/*
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- NweekNumber
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-
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* Purpose:
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* Calculates week number in which a given date occurs, based
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* on a specified start-day of week.
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* Adjusts based on how a calendar would show this week
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* (ie. week 53 is probably week 1 on the calendar).
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*
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* Arguments:
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* pdtm Pointer to date in question
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* dowStartWeek Day-of-week on which weeks starts (0 - 6).
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*
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* Returns:
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* Week number of the year, in which *pdtr occurs.
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*
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*/
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// TODO: this currently ignores woyFirst
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// it uses the 1st week containing 4+ days as the first week (woyFirst = 2)
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// need to make appropriate changes so it handles woyFirst = 0 and = 1...
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int GetWeekNumber(const SYSTEMTIME *pst, int dowFirst, int woyFirst)
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{
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int day, ddow, ddowT, nweek;
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SYSTEMTIME st;
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st.wYear = pst->wYear;
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st.wMonth = 1;
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st.wDay = 1;
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ddow = GetStartDowForMonth(st.wYear, st.wMonth) - dowFirst;
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if (ddow < 0)
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ddow += 7;
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if (pst->wMonth == 1 && pst->wDay < 8 - ddow)
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{
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nweek = 0;
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}
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else
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{
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if (ddow)
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st.wDay = 8 - ddow;
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nweek = (DaysBetweenDates(&st, pst) / 7) + 1;
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}
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if (ddow && ddow <= 3)
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nweek++;
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// adjust if necessary for calendar
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if (!nweek)
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{
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if (!ddow)
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return(1);
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// check what week Dec 31 is on
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st.wYear--;
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st.wMonth = 12;
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st.wDay = 31;
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return(GetWeekNumber(&st, dowFirst, woyFirst));
|
||
|
|
}
|
||
|
|
else if (nweek >= 52)
|
||
|
|
{
|
||
|
|
ddowT = (GetStartDowForMonth(pst->wYear, pst->wMonth) +
|
||
|
|
pst->wDay - 1 + 7 - dowFirst) % 7;
|
||
|
|
day = pst->wDay + (7 - ddowT);
|
||
|
|
if (day > 31 + 4)
|
||
|
|
nweek = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return(nweek);
|
||
|
|
}
|
||
|
|
|
||
|
|
// ignores day of week and time-related fields...
|
||
|
|
// BUGBUG also validate years in range
|
||
|
|
BOOL IsValidDate(const SYSTEMTIME *pst)
|
||
|
|
{
|
||
|
|
int cDay;
|
||
|
|
|
||
|
|
if (pst && pst->wMonth >= 1 && pst->wMonth <= 12)
|
||
|
|
{
|
||
|
|
cDay = GetDaysForMonth(pst->wYear, pst->wMonth);
|
||
|
|
if (pst->wDay >= 1 && pst->wDay <= cDay)
|
||
|
|
return(TRUE);
|
||
|
|
}
|
||
|
|
return(FALSE);
|
||
|
|
}
|
||
|
|
|
||
|
|
// ignores milliseconds and date-related fields...
|
||
|
|
BOOL IsValidTime(const SYSTEMTIME *pst)
|
||
|
|
{
|
||
|
|
return(pst->wHour <= 23 &&
|
||
|
|
pst->wMinute <= 59 &&
|
||
|
|
pst->wSecond <= 59);
|
||
|
|
}
|
||
|
|
|
||
|
|
// ignores day of week
|
||
|
|
BOOL IsValidSystemtime(const SYSTEMTIME *pst)
|
||
|
|
{
|
||
|
|
if (pst && pst->wMonth >= 1 && pst->wMonth <= 12)
|
||
|
|
{
|
||
|
|
int cDay = GetDaysForMonth(pst->wYear, pst->wMonth);
|
||
|
|
if (pst->wDay >= 1 &&
|
||
|
|
pst->wDay <= cDay &&
|
||
|
|
pst->wHour <= 23 &&
|
||
|
|
pst->wMinute <= 59 &&
|
||
|
|
pst->wSecond <= 59 &&
|
||
|
|
pst->wMilliseconds < 1000)
|
||
|
|
return(TRUE);
|
||
|
|
}
|
||
|
|
return(FALSE);
|
||
|
|
}
|