/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved. The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#include "e.h"

void
fromto(int p1, int p2, int p3)
{
	int b, h1, b1, pss;
	yyval = oalloc();
	lfont[yyval] = rfont[yyval] = 0;
	h1 = eht[yyval] = eht[p1];
	b1 = ebase[p1];
	b = 0;
	pss = EFFPS(ps);
	ps += 3;
	nrwid(p1, ps, p1);
	printf(".nr %d \\n(%d\n", yyval, p1);
	if (p2 > 0) {
		nrwid(p2, pss, p2);
		printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n",
		    p2, yyval, yyval, p2);
		eht[yyval] += eht[p2];
		b = eht[p2];
	}
	if (p3 > 0) {
		nrwid(p3, pss, p3);
		printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n",
		    p3, yyval, yyval, p3);
		eht[yyval] += eht[p3];
	}
	printf(".ds %d ", yyval);	/* bottom of middle box */
	if (p2 > 0) {
		printf("\\v'%du'\\h'\\n(%du-\\n(%du/2u'\\s%d\\*(%d\\s%d",
		    eht[p2]-ebase[p2]+b1, yyval, p2, pss, p2, EFFPS(ps));
		printf("\\h'-\\n(%du-\\n(%du/2u'\\v'%du'\\\n",
		    yyval, p2, -(eht[p2]-ebase[p2]+b1));
	}
#ifndef NEQN
	printf("\\h'\\n(%du-\\n(%du/2u'\\*(%d\\h'\\n(%du-\\n(%du/2u'\\\n",
	    yyval, p1, p1, yyval, p1);
#else	/* NEQN */
	printf("\\h'\\n(%du-\\n(%du/2u'\\*(%d\\h'\\n(%du-\\n(%du+2u/2u'\\\n",
	    yyval, p1, p1, yyval, p1);
#endif	/* NEQN */
	if (p3 > 0) {
		printf("\\v'%du'\\h'-\\n(%du-\\n(%du/2u'\\s%d\\*(%d\\s%d"
		    "\\h'\\n(%du-\\n(%du/2u'\\v'%du'\\\n",
		    -(h1-b1+ebase[p3]), yyval, p3, pss, p3, EFFPS(ps),
		    yyval, p3, (h1-b1+ebase[p3]));
	}
	printf("\n");
	ebase[yyval] = b + b1;
	if (dbg)
		printf(".\tfrom to: S%d <- %d f %d t %d; h=%d b=%d\n",
		    yyval, p1, p2, p3, eht[yyval], ebase[yyval]);
	ofree(p1);
	if (p2 > 0) ofree(p2);
	if (p3 > 0) ofree(p3);
}