/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ # include "e.h" void fromto(int p1, int p2, int p3){	double b, h1, b1, t;	int subps; 	yyval = salloc();	lfont[yyval] = rfont[yyval] = 0;	h1 = eht[yyval] = eht[p1];	b1 = ebase[p1];	b = 0;	subps = ps;	ps += deltaps;	nrwid(p1, ps, p1);	printf(".nr %d \\n(%d\n", yyval, p1);	if (p2 > 0) {		nrwid(p2, subps, 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, subps, 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) {		t = eht[p2]-ebase[p2]+b1;		printf("\\v'%gm'\\h'\\n(%du-\\n(%du/2u'%s\\*(%d%s", 			REL(t,ps), yyval, p2, DPS(ps,subps), p2, DPS(subps,ps));		printf("\\h'-\\n(%du-\\n(%du/2u'\\v'%gm'\\\n", 			yyval, p2, REL(-t,ps));	}	printf("\\h'\\n(%du-\\n(%du/2u'\\*(%d\\h'\\n(%du-\\n(%du/2u'\\\n", 		yyval, p1, p1, yyval, p1);	if (p3  >0) {		t = h1-b1+ebase[p3];		printf("\\v'%gm'\\h'-\\n(%du-\\n(%du/2u'%s\\*(%d%s\\h'\\n(%du-\\n(%du/2u'\\v'%gm'\\\n", 			REL(-t,ps), yyval, p3, DPS(ps,subps), p3, DPS(subps,ps), yyval, p3, REL(t,ps));	}	printf("\n");	ebase[yyval] = b + b1;	dprintf(".\tS%d <- %d from %d to %d; h=%g b=%g\n", 		yyval, p1, p2, p3, eht[yyval], ebase[yyval]);	sfree(p1);	if (p2 > 0)		sfree(p2);	if (p3 > 0)		sfree(p3);}