+ if (ls == 0) ls = ACS_VLINE;
+ if (rs == 0) rs = ACS_VLINE;
+ if (ts == 0) ts = ACS_HLINE;
+ if (bs == 0) bs = ACS_HLINE;
+ if (tl == 0) tl = ACS_ULCORNER;
+ if (tr == 0) tr = ACS_URCORNER;
+ if (bl == 0) bl = ACS_LLCORNER;
+ if (br == 0) br = ACS_LRCORNER;
+