/*	$Id: c_div.c,v 1.3 2008/02/28 16:48:50 ragge Exp $	*/
/*
 * Copyright(C) Caldera International Inc. 2001-2002. All rights reserved.
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 * modification, are permitted provided that the following conditions
 * are met:
 *
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 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditionsand the following disclaimer in the
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 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 * 	This product includes software developed or owned by Caldera
 *	International, Inc.
 * Neither the name of Caldera International, Inc. nor the names of other
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
 * INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE LIABLE
 * FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 */
#include <stdlib.h>

#include "f77lib.h"

void
c_div(complex *c, complex *a, complex *b)
{
	double ratio, den;
	double abr, abi;

	if( (abr = b->real) < 0.)
		abr = - abr;
	if( (abi = b->imag) < 0.)
		abi = - abi;
	if( abr <= abi ) {
		if(abi == 0)
			abort(); /* fatal("complex division by zero"); */
		ratio = b->real / b->imag ;
		den = b->imag * (1 + ratio*ratio);
		c->real = (a->real*ratio + a->imag) / den;
		c->imag = (a->imag*ratio - a->real) / den;
	} else {
		ratio = b->imag / b->real ;
		den = b->real * (1 + ratio*ratio);
		c->real = (a->real + a->imag*ratio) / den;
		c->imag = (a->imag - a->real*ratio) / den;
	}

}