1 #ifndef lint
2 static char *sccsid = "fromto.c	(CWI)	1.1	85/03/01";
3 #endif
4 # include "e.h"
5 
6 fromto(p1, p2, p3) int p1, p2, p3; {
7 	int b, h1, b1, pss;
8 	yyval = oalloc();
9 	lfont[yyval] = rfont[yyval] = 0;
10 	h1 = eht[yyval] = eht[p1];
11 	b1 = ebase[p1];
12 	b = 0;
13 	pss = EFFPS(ps);
14 	ps += 3;
15 	nrwid(p1, ps, p1);
16 	printf(".nr %d \\n(%d\n", yyval, p1);
17 	if( p2>0 ) {
18 		nrwid(p2, pss, p2);
19 		printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p2, yyval, yyval, p2);
20 		eht[yyval] += eht[p2];
21 		b = eht[p2];
22 	}
23 	if( p3>0 ) {
24 		nrwid(p3, pss, p3);
25 		printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p3, yyval, yyval, p3);
26 		eht[yyval] += eht[p3];
27 	}
28 	printf(".ds %d ", yyval);	/* bottom of middle box */
29 	if( p2>0 ) {
30 		printf("\\v'%du'\\h'\\n(%du-\\n(%du/2u'\\s%d\\*(%d\\s%d",
31 			eht[p2]-ebase[p2]+b1, yyval, p2, pss, p2, EFFPS(ps));
32 		printf("\\h'-\\n(%du-\\n(%du/2u'\\v'%du'\\\n",
33 			yyval, p2, -(eht[p2]-ebase[p2]+b1));
34 	}
35 	printf("\\h'\\n(%du-\\n(%du/2u'\\*(%d\\h'\\n(%du-\\n(%du/2u'\\\n",
36 		yyval, p1, p1, yyval, p1);
37 	if( p3>0 ) {
38 		printf("\\v'%du'\\h'-\\n(%du-\\n(%du/2u'\\s%d\\*(%d\\s%d\\h'\\n(%du-\\n(%du/2u'\\v'%du'\\\n",
39 			-(h1-b1+ebase[p3]), yyval, p3, pss, p3, EFFPS(ps), yyval, p3, (h1-b1+ebase[p3]));
40 	}
41 	printf("\n");
42 	ebase[yyval] = b + b1;
43 	if(dbg)printf(".\tfrom to: S%d <- %d f %d t %d; h=%d b=%d\n",
44 		yyval, p1, p2, p3, eht[yyval], ebase[yyval]);
45 	ofree(p1);
46 	if( p2>0 ) ofree(p2);
47 	if( p3>0 ) ofree(p3);
48 }
49