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 (file)
index 0000000..614fd6f
--- /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);
+}