79 lines
1.3 KiB
C
79 lines
1.3 KiB
C
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/* DEC *SumDecimalArrayPositive(pDst,pSrc,n)
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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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* int n;
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*
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* DESCRIPTION
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* Sets pDst to the sum of the n DEC elements of the array pSrc.
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* If n is 0, 0 is returned. pDst is unchanged if an error occurs.
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* Only the positive elements are added.
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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 the sum if successful, otherwise
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* returns GM_NULL.
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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_ARGVAL
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*
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* AUTHOR
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* Jared Levy
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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 *SumDecimalArrayPositive(pDst,pSrc,n)
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DEC *pDst;
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DEC **pSrc;
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int n;
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{
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int i;
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DEC *p, dsum, *sum=&dsum;
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/* source must be supplied !! */
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_MacStart(GM_SUMARRP);
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if (!pSrc||!pDst) {
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_MacErr(GM_NULLPOINTER);
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_MacRet(GM_NULL);
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}
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if (n<0) {
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_MacErr(GM_ARGVAL);
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_MacRet(GM_NULL);
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}
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for (i=0; i<n; i++) {
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_MacInVar(pSrc[i],GM_NULL);
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}
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_MacDZero(sum);
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for (i=0;i<n;i++) {
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p = pSrc[i];
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if (_MacIsDecP(p))
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(void) _AddDec80Bit(sum, sum, p);
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/* overflow impossible here since sum is 80 bits */
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}
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/* sum must be 64 bits */
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if (_Sq5UnsTo4Uns(sum) != GM_SUCCESS) {
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_MacErr(GM_OVERFLOW);
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_MacRet(GM_NULL);
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}
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_MacDCopy(pDst,sum);
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_MacRet(pDst);
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}
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