82 lines
1.6 KiB
C
82 lines
1.6 KiB
C
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/* DEC **SubtractDecimalFromDecimalArray(pDst,pSrc1,pSrc2,n)
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*
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* ARGUMENT
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* pDst is a ptr to the array of destination DEC pointers.
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* pSrc1 is a ptr to the arrays of source DEC pointers
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* pSrc2 is a ptr to another DEC.
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* n is the number of elements in pSrc
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*
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* DESCRIPTION
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* Sets pDst[i] = pSrc1[i] - pSrc2. If pDst is null, tries to create a
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* DEC structure, then subtract. If some of the pSrc structures
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* are null, the non-null ones are still subtracted.
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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 new structure if successful, otherwise
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* returns GM_NULLARR.
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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 **SubtractDecimalFromDecimalArray(pDst,pSrc1,pSrc2,n)
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DEC **pDst;
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DEC **pSrc1, *pSrc2;
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int n;
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{
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int i;
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DEC dcop2, *cop2=&dcop2;
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mbool copyback;
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/* source must be supplied !! */
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_MacStart(GM_SUBARRD);
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_MacInVar(pSrc2, GM_NULLARR);
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if (!pSrc1 || !pDst) {
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_MacErr(GM_NULLPOINTER);
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_MacRet(GM_NULLARR);
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}
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if (n<=0) {
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_MacErr(GM_ARGVAL);
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_MacRet(GM_NULLARR);
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}
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/* Copy Src2 in case it is part of destination array */
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_MacDCopy(cop2, pSrc2);
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/* check if backwards copy is necessary */
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copyback=(pDst > pSrc1);
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/* Subtract the numbers */
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i = copyback ? n-1 : 0;
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while ((i<n) && (i>=0)) {
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(void) SubtractDecimal(pDst[i], pSrc1[i], cop2);
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/* SubtractDecimal sets the error flag each time an error occurs */
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if (copyback)
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i--;
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else
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i++;
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}
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_MacRet(pDst);
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}
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