From: Bill Shannon <shannon@ucbvax.Berkeley.EDU>
Date: Sat, 12 Feb 1983 10:28:01 +0000 (-0800)
Subject: date and time created 83/02/11 18:28:01 by shannon
X-Git-Tag: BSD-4_1c_2-Snapshot-Development~464
X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/commitdiff_plain/d3bad14d0952958afdcd001fe126968a51968c3b

date and time created 83/02/11 18:28:01 by shannon

SCCS-vsn: old/eqn/common_source/fromto.c 4.1
---

diff --git a/usr/src/old/eqn/common_source/fromto.c b/usr/src/old/eqn/common_source/fromto.c
new file mode 100644
index 0000000000..614fd6fa4f
--- /dev/null
+++ b/usr/src/old/eqn/common_source/fromto.c
@@ -0,0 +1,47 @@
+/*	fromto.c	4.1	83/02/11	*/
+
+# include "e.h"
+
+fromto(p1, p2, p3) int p1, p2, 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));
+	}
+	printf("\\h'\\n(%du-\\n(%du/2u'\\*(%d\\h'\\n(%du-\\n(%du/2u'\\\n", 
+		yyval, p1, p1, yyval, p1);
+	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);
+}