ba237a9d91
Files correlati : Ricompilazione Demo : [ ] Commento : Aggiunti i sorgenti per Greenleaf Math Library (gfm.dll) git-svn-id: svn://10.65.10.50/trunk@10079 c028cbd2-c16b-5b4b-a496-9718f37d4682
84 lines
1.7 KiB
C
Executable File
84 lines
1.7 KiB
C
Executable File
/* long ConvDecimalToLong(x)
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*
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* ARGUMENT
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* DEC *x;
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*
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* DESCRIPTION
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* Converts a DEC to a long.
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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 integer if the conversion is successful, and the error code
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* otherwise.
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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_CNVRE
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* GM_CNVRW
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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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long ConvDecimalToLong(x)
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DEC *x;
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{
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DEC temp;
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DEC *pt=&temp, dn, *n=&dn;
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mbool wfIsNeg;
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long l;
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unsigned long maxpos=2147483647L;
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_MacStart(GM_DTOL);
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_MacInVar(x, 0L);
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_MacDCopy(n, x);
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/*
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* The following two lines of code shouldn't be separated. I ran into
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* a problem with Zortech v2.06. If the _ScaleDec80Bit is called right
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* after executing _MacIsDecN, the 0 in the parameter list sometimes
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* gets changed to a -1. This is bad. Expect Zortech to fix it someday,
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* but since I only had to change the order of execution of these three
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* lines, no need to change. Same problem is found in DTOL.C.
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*/
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(void) _ScaleDec80Bit(pt, n, 0); /* convert to integer format */
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wfIsNeg = _MacIsDecN(n);
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/* |x| < 2147483648 */
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if ((pt->ls.lsl[1] == 0) && !(pt->ls.lsl[0] & 0x80000000/*UL*/)
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&& (pt->dc.msd == 0)) {
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l = (long) (pt->ls.lsl[0]);
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if (CompareDecimal(n,pt)!=0)
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_MacErr(GM_CNVRW);
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if (wfIsNeg)
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{_MacRet(-l)}
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else
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_MacRet(l);
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}
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/* check for -2147483648 AND "logical" _MacRet to get by MSC bug*/
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if (wfIsNeg && (pt->ls.lsl[0] == 0x80000000L) &&
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(pt->ls.lsl[1] == 0) && (pt->ls.lmsd == 0)) {
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if (CompareDecimal(n,pt)!=0)
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_MacErr(GM_CNVRW);
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_MacRet((long) ~maxpos);
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}
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/* overflow */
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_MacErr(GM_CNVRE);
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_MacRet(0L);
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}
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