+/* tv.c 4.1 83/02/12 */
+
+ /* tv.c: draw vertical lines */
+# include "t..c"
+drawvert(start,end, c, lwid)
+{
+char *exb=0, *ext=0;
+int tp=0, sl, ln, pos, epb, ept, vm;
+end++;
+vm='v';
+/* note: nr 35 has value of 1m outside of linesize */
+while (instead[end]) end++;
+for(ln=0; ln<lwid; ln++)
+ {
+ epb=ept=0;
+ pos = 2*ln-lwid+1;
+ if (pos!=tp) fprintf(tabout, "\\h'%dp'", pos-tp);
+ tp = pos;
+ if (end<nlin)
+ {
+ if (fullbot[end]|| (!instead[end] && allh(end)))
+ epb=2;
+ else
+ switch (midbar(end,c))
+ {
+ case '-':
+ exb = "1v-.5m"; break;
+ case '=':
+ exb = "1v-.5m";
+ epb = 1; break;
+ }
+ }
+ if (lwid>1)
+ switch(interh(end, c))
+ {
+ case THRU: epb -= 1; break;
+ case RIGHT: epb += (ln==0 ? 1 : -1); break;
+ case LEFT: epb += (ln==1 ? 1 : -1); break;
+ }
+ if (lwid==1)
+ switch(interh(end,c))
+ {
+ case THRU: epb -= 1; break;
+ case RIGHT: case LEFT: epb += 1; break;
+ }
+ if (start>0)
+ {
+ sl = start-1;
+ while (sl>=0 && instead[sl]) sl--;
+ if (sl>=0 && (fullbot[sl] || allh(sl)))
+ ept=0;
+ else
+ if (sl>=0)
+ switch(midbar(sl,c))
+ {
+ case '-':
+ ext = ".5m"; break;
+ case '=':
+ ext= ".5m"; ept = -1; break;
+ default:
+ vm = 'm'; break;
+ }
+ else
+ ept = -4;
+ }
+ else if (start==0 && allh(0))
+ {
+ ept=0;
+ vm = 'm';
+ }
+ if (lwid>1)
+ switch(interh(start,c))
+ {
+ case THRU: ept += 1; break;
+ case LEFT: ept += (ln==0 ? 1 : -1); break;
+ case RIGHT: ept += (ln==1 ? 1 : -1); break;
+ }
+ else if (lwid==1)
+ switch(interh(start,c))
+ {
+ case THRU: ept += 1; break;
+ case LEFT: case RIGHT: ept -= 1; break;
+ }
+ if (exb)
+ fprintf(tabout, "\\v'%s'", exb);
+ if (epb)
+ fprintf(tabout, "\\v'%dp'", epb);
+ fprintf(tabout, "\\s\\n(%d",LSIZE);
+ if (linsize)
+ fprintf(tabout, "\\v'-\\n(%dp/6u'", LSIZE);
+ fprintf(tabout, "\\h'-\\n(#~u'"); /* adjustment for T450 nroff boxes */
+ fprintf(tabout, "\\L'|\\n(#%cu-%s", linestop[start]+'a'-1, vm=='v'? "1v" : "\\n(35u");
+ if (ext)
+ fprintf(tabout, "-(%s)",ext);
+ if (exb)
+ fprintf(tabout, "-(%s)", exb);
+ pos = ept-epb;
+ if (pos)
+ fprintf(tabout, "%s%dp", pos>=0? "+" : "", pos);
+ /* the string #d is either "nl" or ".d" depending
+ on diversions; on GCOS not the same */
+ fprintf(tabout, "'\\s0\\v'\\n(\\*(#du-\\n(#%cu+%s", linestop[start]+'a'-1,vm=='v' ? "1v" : "\\n(35u");
+ if (ext)
+ fprintf(tabout, "+%s",ext);
+ if (ept)
+ fprintf(tabout, "%s%dp", (-ept)>0 ? "+" : "", (-ept));
+ fprintf(tabout, "'");
+ if (linsize)
+ fprintf(tabout, "\\v'\\n(%dp/6u'", LSIZE);
+ }
+}
+
+
+midbar(i,c)
+{
+int k;
+k = midbcol(i,c);
+if (k==0 && c>0)
+ k = midbcol(i, c-1);
+return(k);
+}
+midbcol(i,c)
+{
+int ct;
+while ( (ct=ctype(i,c)) == 's')
+ c--;
+if (ct=='-' || ct == '=')
+ return(ct);
+if (ct=barent(table[i][c].col))
+ return(ct);
+return(0);
+}
+
+barent(s)
+ char *s;
+{
+if (s==0) return (1);
+if (s[0]== '\\') s++;
+if (s[1]!= 0)
+ return(0);
+switch(s[0])
+ {
+ case '_':
+ return('-');
+ case '=':
+ return('=');
+ }
+return(0);
+}