/*
 * 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);
}