78 lines
1.4 KiB
C
78 lines
1.4 KiB
C
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/* DEC *AntiLogEDecimal(pDst,pSrc)
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*
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* ARGUMENT
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* DEC *pDst;
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* DEC *pSrc;
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*
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* DESCRIPTION
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* Sets pDst = e^pSrc;
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*
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* SIDE EFFECTS
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* None.
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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 didn't contain a previous error on entry.
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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_OVERFLOW
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* GM_UNDERFLOW
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*
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* AUTHOR
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* Jared Levy Aug 7, 1987
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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 *AntiLogEDecimal(pDst,pSrc)
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DEC *pDst;
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DEC *pSrc;
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{
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int i;
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DEC *pa;
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_MacStart(GM_DEXP);
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_MacInVarD(pSrc);
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_MacOutVarD(pDst);
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if((pSrc->dc.id == 0) && ((pSrc->dc.msd == 0) &&
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(pSrc->ls.lsl[1] == 0L) && (pSrc->dc.sl[1] == 0))
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&& (!(pSrc->dc.sl[0] & 0x8000))) {
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pa = &decE; /* points to constant 'e' */
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_MacDCopy(pDst,pa);
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i = _IntPwrDec80Bit(pDst,pDst,ConvDecimalToInt(pSrc));
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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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}
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else {
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i = _ExpDec80Bit(pDst, pSrc);
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if (i == GM_OVERFLOW) {
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_MacErr(i);
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_MacRet(GM_NULL);
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}
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}
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/* reduce from 80-bit back to 64-bit */
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if(_Sq5UnsTo4Uns(pDst) != GM_SUCCESS) {
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_MacErr(GM_OVERFLOW);
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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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}
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_MacRet(pDst);
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}
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