0688668ef5
Files correlati : gfm.dll Ricompilazione Demo : [ ] Commento : Modifiche per la compilazione Linux git-svn-id: svn://10.65.10.50/trunk@11079 c028cbd2-c16b-5b4b-a496-9718f37d4682
131 lines
2.3 KiB
C
Executable File
131 lines
2.3 KiB
C
Executable File
/* DEC *ConvDoubleToDecimal( x, f)
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*
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* ARGUMENT
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* DEC *x;
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* double f;
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*
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* DESCRIPTION
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* Converts a double to a DEC with maximum implied decimal. Uses
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* eTwoTo32 (2^32), eTwoTo63 (2^63), and ergGMPowersOfTenDouble
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* (powers of ten), all global double variables.
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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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* The DEC if the conversion is successful, and GM_NULL otherwise.
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*
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* POSSIBLE ERROR CODES
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*
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* GM_NOMEMORY
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* GM_CNVRE
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*
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* AUTHOR
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* Jared Levy Feb. 9, 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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#include "math.h"
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DEC *ConvDoubleToDecimal( x, f)
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DEC *x;
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double f;
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{
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int nid;
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mbool wfIsNeg=FALSE;
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double g;
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_MacStart(GM_DFTOD);
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_MacOutVarD(x);
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/* take absolute value of negative values */
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if (f<0.0) {
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wfIsNeg = TRUE;
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f = -f;
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}
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/* f = 0 */
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if (f == 0.0) {
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_MacDZero(x);
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_MacRet(x);
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}
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/* overflow & underflow (MAXID = 18, MINID = 0) */
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if ((f>=eTwoTo63) || (f<.5e-18)) {
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if (x)
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_MacDZero(x);
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_MacErr(GM_CNVRE);
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_MacRet(GM_NULL);
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}
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/* take absolute value of negative values */
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if (f<0.0) {
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wfIsNeg = TRUE;
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f = -f;
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}
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_MacDZero(x);
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/* calculate implied decimal of DEC */
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g = eTwoTo63/f;
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nid = 0;
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while ((nid <= 17) && (ergGMPowersOfTenDouble[nid+1] <= g))
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nid++;
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/* adjust by power of 10 */
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f = f * ergGMPowersOfTenDouble[nid];
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/* add .5 to round rather than truncate */
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f+= 0.5;
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/* change float to 64 bit integer */
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if (f >= eTwoTo32 - 1) {
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#ifdef ZORTECH
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if ( (f / eTwoTo32) > eTwoTo31 ) {
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x->ls.lsl[1] = (unsigned long) ((f / eTwoTo32) - eTwoTo31 );
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x->ls.lsl[1] += (unsigned long) eTwoTo31;
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} else
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x->ls.lsl[1] = (unsigned long) (f / eTwoTo32);
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#else
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x->ls.lsl[1] = (unsigned long) (f / eTwoTo32);
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#endif
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g = (double) x->ls.lsl[1];
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f-= g * eTwoTo32;
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while (f<0.0) {
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x->ls.lsl[1]--;
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f+= eTwoTo32;
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}
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while (f>= eTwoTo32) {
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x->ls.lsl[1]++;
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f-= eTwoTo32;
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}
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}
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else
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x->ls.lsl[1] = 0;
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#ifdef ZORTECH
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if ( f > eTwoTo31 ) {
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x->ls.lsl[0] = f - eTwoTo31;
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x->ls.lsl[0] += (unsigned long) eTwoTo31;
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} else
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x->ls.lsl[0] = (unsigned long) f;
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#else
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x->ls.lsl[0] = (unsigned long) f;
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#endif
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x->ls.lid = nid;
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x->dc.msd = 0; /* msd can't be set either */
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if (wfIsNeg) {
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_MacDChgs(x);
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}
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_MacRet(x);
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}
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