/* DEC	*SubtractAscii(pDst,pSrc1,pSrc2)
 *
 * ARGUMENT
 *	pDst is	a pointer to the destination DEC structure
 *	pSrc1 is a pointer to source1 ASCII string
 *	pSrc2 is a pointer to source2 ASCII string
 *
 * DESCRIPTION
 *	Subtracts the value in pSrc2 (ASCII) to	the value in pSrc1 (ASCII)
 *	and puts the result in pDst DEC	structure
 *
 * SIDE	EFFECTS
 *	On overflow, the dest structure	is unchanged
 *
 * RETURNS
 *	Returns	a pointer to the dest structure	unless overflow,
 *   otherwise,	returns	a GM_NULL(a C false). On error,	the error
 *   is	in wGMError, unless an error was already there.
 *
 * POSSIBLE ERROR CODES
 *
 *	GM_NULLSTRING
 *	GM_NAN
 *	GM_CNVRE
 *	GM_CNVRW
 *	GM_OVERFLOW
 *
 * AUTHOR
 *   Andy Anderson	20-Feb-87	17:40
 *   Copyright (C) 1987-1990 Greenleaf Software	Inc.  All rights reserved.
 *
 *
 * MODIFICATIONS
 *
 */

#include <stdio.h>
#include "gm.h"
#include "gmsystem.h"

DEC	*SubtractAscii(pDst,pSrc1,pSrc2)
DEC	*pDst;
char	*pSrc1,*pSrc2;
{
	DEC	ds1,ds2;
	DEC	*ps1,*ps2,*pd;

	_MacStart(GM_SUBSTR);
	ps1=&ds1;
	ps2=&ds2;

	/* convert ascii to DEC	*/
	ps1=ConvAsciiToDecimal(ps1,pSrc1);
	if (!ps1)
		_MacRet(GM_NULL);

	ps2=ConvAsciiToDecimal(ps2,pSrc2);
	if (!ps2)
		_MacRet(GM_NULL);

	pd = SubtractDecimal(pDst,ps1,ps2);

	_MacRet(pd);

}