77 lines
1.4 KiB
C
77 lines
1.4 KiB
C
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/* DEC *MultiplyDecimalAndRound(pDst,pSrc1,pSrc2,nid);
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*
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* ARGUMENT
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* DEC *pDst;
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* DEC *pSrc1,pSrc2;
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* int nid;
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*
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* DESCRIPTION
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* Multiplies pSrc1 by pSrc2, storing the result in pDst. The product is
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* calculated to nid decimal places.
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*
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* SIDE EFFECTS
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*
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* RETURNS
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* Returns pointer to pDst if successful, otherwise a GM_NULL. The
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* type error (GM_OVERFLOW, GM_UNDERFLOW, GM_NOMEMORY) is in wGMError
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* if wGMError doesn't contain a previous error.
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*
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* POSSIBLE ERROR CODES
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*
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* GM_NULLPOINTER
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* GM_INVALIDID
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* GM_OVERFLOW
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* GM_UNDERFLOW
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*
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* AUTHOR
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* Jared Levy 05-JAN-1987 17:30
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* Copyright (C) 1987-1990 Greenleaf Software Inc. All rights reserved.
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*
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* MODIFICATIONS
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*
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*/
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#include <stdio.h>
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#include "gm.h"
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#include "gmsystem.h"
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DEC *MultiplyDecimalAndRound(pDst,pSrc1,pSrc2,nid)
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DEC *pDst;
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DEC *pSrc1,*pSrc2;
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int nid;
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{
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register int i;
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_MacStart(GM_DMULR);
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if ((nid<GM_MINID) || (nid>GM_MAXID)) {
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_MacErr(GM_INVALIDID);
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_MacRet(GM_NULL);
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}
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if (!MultiplyDecimal(pDst, pSrc1, pSrc2))
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_MacRet(GM_NULL);
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if (_MacIsDecZ(pDst)) {
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pDst->dc.id = nid;
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_MacRet(pDst);
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}
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i = _ScaleDec80Bit(pDst, pDst, nid);
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/* check if number can fit into 64 bits (no shifting allowed) */
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if (!((pDst->dc.msd == 0) && (pDst->dc.sl[3] < 32768L)))
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i = GM_OVERFLOW;
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if (i != GM_SUCCESS) {
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_MacErr(i);
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_MacRet(GM_NULL);
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}
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if (_MacIsDecZ(pDst))
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_MacErr(GM_UNDERFLOW);
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_MacRet(pDst);
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}
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