+ }
+ }
+}
+
+/*
+ * Match "crosswin()", but using line-drawing characters. This could be done
+ * a little simpler using box(), but the reason for this example is to test
+ * hline/vline and addch with line-drawing vs the copy/overlay functions.
+ */
+static void
+crossbox(WINDOW *win)
+{
+ int y1, x1;
+ int ymax, xmax;
+
+ getmaxyx(win, y1, x1);
+
+ ymax = (y1 + 1);
+ xmax = (x1 + 1);
+
+ mvwhline(win, 0, (xmax / 3), ACS_HLINE, (xmax / 3));
+ mvwhline(win, ymax / 3, 0, ACS_HLINE, xmax);
+ mvwhline(win, ((2 * ymax) / 3) - 1, 0, ACS_HLINE, xmax);
+ mvwhline(win, y1 - 1, (xmax / 3), ACS_HLINE, (xmax / 3));
+
+ mvwvline(win, (ymax / 3), 0, ACS_VLINE, (ymax / 3));
+ mvwvline(win, 0, xmax / 3, ACS_VLINE, ymax);
+ mvwvline(win, 0, ((2 * xmax) / 3) - 1, ACS_VLINE, ymax);
+ mvwvline(win, (ymax / 3), x1 - 1, ACS_VLINE, (ymax / 3));
+
+ mvwaddch(win, 0, (xmax / 3), ACS_ULCORNER);
+ mvwaddch(win, 0, ((2 * xmax) / 3) - 1, ACS_URCORNER);
+ mvwaddch(win, y1 - 1, (xmax / 3), ACS_LLCORNER);
+ mvwaddch(win, y1 - 1, ((2 * xmax) / 3) - 1, ACS_LRCORNER);
+
+ mvwaddch(win, (ymax / 3), 0, ACS_ULCORNER);
+ mvwaddch(win, ((2 * ymax) / 3) - 1, 0, ACS_LLCORNER);
+ mvwaddch(win, (ymax / 3), x1 - 1, ACS_URCORNER);
+ mvwaddch(win, ((2 * ymax) / 3) - 1, x1 - 1, ACS_LRCORNER);
+
+ mvwaddch(win, (ymax / 3), (xmax / 3), ACS_PLUS);
+ mvwaddch(win, (ymax / 3), ((2 * xmax) / 3) - 1, ACS_PLUS);
+ mvwaddch(win, ((2 * ymax) / 3) - 1, ((2 * xmax) / 3) - 1, ACS_PLUS);
+ mvwaddch(win, ((2 * ymax) / 3) - 1, (xmax / 3), ACS_PLUS);
+}
+
+typedef enum {
+ otBASE_refresh = 0
+ ,otBASE_fill
+ ,otBASE_draw
+ ,otBASE_clear
+ ,otBASE_copy
+} otBASE;
+
+#define OVERLAP_FLAVORS 6
+
+typedef enum {
+ otFILL_normal = 0
+ ,otFILL_bold
+ ,otFILL_color
+ ,otFILL_bright
+} otFILL;
+
+#define LimitFILL() UseColors ? 4 : 2
+
+typedef enum {
+ otDRAW_text_cross = 0
+ ,otDRAW_line_box
+ ,otDRAW_line_cross
+ ,otDRAW_set_bg
+ ,otDRAW_reset_bg
+} otDRAW;
+
+#define LimitDRAW() UseColors ? 5 : 3
+
+typedef enum {
+ otCOPY_overwrite = 0
+ ,otCOPY_merge
+ ,otCOPY_force
+ ,otCOPY_overlay
+} otCOPY;
+
+#define LimitCOPY() 4
+
+static void
+overlap_helpitem(int state, int item, char *message)
+{
+ int row = (item / 2);
+ int col = ((item % 2) ? COLS / 2 : 0);
+
+ move(LINES - 6 + row, col);
+ printw("%c%c = %s", state == row ? '>' : ' ', 'a' + item, message);
+ clrtoeol();
+}
+
+static void
+overlap_test_1_attr(WINDOW *win, int flavor, int col)
+{
+ NCURSES_PAIRS_T cpair = (NCURSES_PAIRS_T) (1 + (flavor * 2) + col);
+
+ switch ((otFILL) flavor) {
+ case otFILL_normal:
+ (void) wattrset(win, A_NORMAL);
+ break;
+ case otFILL_bold:
+ (void) wattrset(win, A_BOLD);
+ break;
+ case otFILL_color:
+ init_pair(cpair, COLOR_BLUE, COLOR_WHITE);
+ (void) wattrset(win, AttrArg(COLOR_PAIR(cpair), A_NORMAL));
+ break;
+ case otFILL_bright:
+ init_pair(cpair, COLOR_WHITE, COLOR_BLUE);
+ (void) wattrset(win, AttrArg(COLOR_PAIR(cpair), A_BOLD));
+ break;
+ }
+}
+
+static void
+overlap_test_2_attr(WINDOW *win, int flavor, int col)
+{
+ NCURSES_PAIRS_T cpair = (NCURSES_PAIRS_T) (9 + (flavor * 2) + col);
+
+ switch ((otDRAW) flavor) {
+ case otDRAW_text_cross:
+ /* no effect */
+ break;
+ case otDRAW_line_box:
+ /* no effect */
+ break;
+ case otDRAW_line_cross:
+ /* no effect */
+ break;
+ case otDRAW_set_bg:
+ init_pair(cpair, COLOR_RED, COLOR_GREEN);
+ wbkgdset(win, colored_chtype(' ', A_BLINK, cpair));
+ break;
+ case otDRAW_reset_bg:
+ wbkgdset(win, ' ' | A_NORMAL);
+ break;
+ }
+}
+
+static int
+overlap_help(int state, int flavors[OVERLAP_FLAVORS])
+{
+ int item;
+ int limit[OVERLAP_FLAVORS];
+ char msg[80];
+
+ if (state < 0)
+ state += OVERLAP_FLAVORS;
+ state = state % OVERLAP_FLAVORS;
+ assert(state >= 0 && state < OVERLAP_FLAVORS);
+
+ for (item = 0; item < (2 * OVERLAP_FLAVORS); ++item) {
+ int row = item / 2;
+ int col = item % 2;
+ const char *ths = col ? "B" : "A";
+ const char *tht = col ? "A" : "B";
+
+ switch ((otBASE) row) {
+ case otBASE_refresh:
+ limit[row] = 1;
+ flavors[row] = 0;
+ _nc_SPRINTF(msg, _nc_SLIMIT(sizeof(msg))
+ "refresh %s, then %s, then doupdate.", ths, tht);
+ break;
+ case otBASE_fill:
+ limit[row] = LimitFILL();
+ flavors[row] %= limit[row];
+ overlap_test_1_attr(stdscr, flavors[row], col);
+ _nc_SPRINTF(msg, _nc_SLIMIT(sizeof(msg))
+ "fill window %s with letter %s.", ths, ths);
+ break;
+ case otBASE_draw:
+ limit[row] = LimitDRAW();
+ flavors[row] %= limit[row];
+ switch ((otDRAW) flavors[row]) {
+ case otDRAW_text_cross:
+ _nc_SPRINTF(msg, _nc_SLIMIT(sizeof(msg))
+ "cross text-pattern in window %s.", ths);
+ break;
+ case otDRAW_line_box:
+ _nc_SPRINTF(msg, _nc_SLIMIT(sizeof(msg))
+ "draw line-box in window %s.", ths);
+ break;
+ case otDRAW_line_cross:
+ _nc_SPRINTF(msg, _nc_SLIMIT(sizeof(msg))
+ "draw line-cross in window %s.", ths);
+ break;
+ case otDRAW_set_bg:
+ _nc_SPRINTF(msg, _nc_SLIMIT(sizeof(msg))
+ "set background of window %s.", ths);
+ break;
+ case otDRAW_reset_bg:
+ _nc_SPRINTF(msg, _nc_SLIMIT(sizeof(msg))
+ "reset background of window %s.", ths);
+ break;
+ }
+ break;
+ case otBASE_clear:
+ limit[row] = 1;
+ flavors[row] = 0;
+ _nc_SPRINTF(msg, _nc_SLIMIT(sizeof(msg))
+ "clear window %s.", ths);
+ break;
+ case otBASE_copy:
+ limit[row] = LimitCOPY();
+ flavors[row] %= limit[row];
+ switch ((otCOPY) flavors[row]) {
+ case otCOPY_overwrite:
+ _nc_SPRINTF(msg, _nc_SLIMIT(sizeof(msg))
+ "overwrite %s onto %s.", ths, tht);
+ break;
+ case otCOPY_merge:
+ _nc_SPRINTF(msg, _nc_SLIMIT(sizeof(msg))
+ "copywin(FALSE) %s onto %s.", ths, tht);
+ break;
+ case otCOPY_force:
+ _nc_SPRINTF(msg, _nc_SLIMIT(sizeof(msg))
+ "copywin(TRUE) %s onto %s.", ths, tht);
+ break;
+ case otCOPY_overlay:
+ _nc_SPRINTF(msg, _nc_SLIMIT(sizeof(msg))
+ "overlay %s onto %s.", ths, tht);
+ break;
+ }
+ break;
+ }
+ overlap_helpitem(state, item, msg);
+ (void) wattrset(stdscr, A_NORMAL);
+ wbkgdset(stdscr, ' ' | A_NORMAL);
+ }
+ move(LINES - 1, 0);
+ printw("^Q/ESC = terminate test. </> shift. Up/down/space select (row %d",
+ state + 1);
+ if (limit[state] > 1)
+ printw(" test %d:%d", 1 + flavors[state], limit[state]);
+ printw(").");
+ clrtoeol();
+
+ return state;
+}
+
+static void
+overlap_test_0(WINDOW *a, WINDOW *b)
+{
+ touchwin(a);
+ touchwin(b);
+ wnoutrefresh(a);
+ wnoutrefresh(b);
+ doupdate();
+}
+
+static void
+overlap_test_1(int flavor, int col, WINDOW *a, char fill)
+{
+ overlap_test_1_attr(a, flavor, col);
+ fillwin(a, fill);
+ (void) wattrset(a, A_NORMAL);
+}
+
+static void
+overlap_test_2(int flavor, int col, WINDOW *a, char fill)
+{
+ overlap_test_2_attr(a, flavor, col);
+ switch ((otDRAW) flavor) {
+ case otDRAW_text_cross:
+ crosswin(a, fill);
+ break;
+ case otDRAW_line_box:
+ box(a, 0, 0);
+ break;
+ case otDRAW_line_cross:
+ crossbox(a);
+ break;
+ case otDRAW_set_bg:
+ /* done in overlap_test_2_attr */
+ break;
+ case otDRAW_reset_bg:
+ /* done in overlap_test_2_attr */
+ break;