- memset(&old_bkgrnd, 0, sizeof(old_bkgrnd));
- (void) wgetbkgrnd(win, &old_bkgrnd);
+ memset(&old_bkgd, 0, sizeof(old_bkgd));
+ (void) wgetbkgrnd(win, &old_bkgd);
+
+ old_char = old_bkgd;
+ RemAttr(old_char, ~A_CHARTEXT);
+ old_attr = AttrOf(old_bkgd);
+ old_pair = GetPair(old_bkgd);
+
+ if (!(old_attr & A_COLOR)) {
+ old_pair = 0;
+ }
+
+ new_char = new_bkgd;
+ RemAttr(new_char, ~A_CHARTEXT);
+ new_attr = AttrOf(new_bkgd);
+ new_pair = GetPair(new_bkgd);
+
+ /* SVr4 limits background character to printable 7-bits */
+ if (!Charable(new_bkgd)) {
+ new_char = old_char;
+ }