+ break;
+ case 47:
+ if (dec) {
+ /*
+ * XTERM-ASB: alternate-screen-buffer
+ * This enables/disables the alternate screen-buffer.
+ * It effectively saves the current page content and
+ * allows you to restore it when changing to the
+ * original screen-buffer again.
+ */
+ screen_change_alt(screen, set);
+ }
+
+ break;
+ case 1047:
+ if (dec) {
+ /*
+ * XTERM-ASBPE: alternate-screen-buffer-post-erase
+ * This is the same as XTERM-ASB but erases the
+ * alternate screen-buffer before switching back to the
+ * original buffer. Use it to discard any data on the
+ * alternate screen buffer when done.
+ */
+ if (!set)
+ screen_reset_page(screen, screen->page_alt);
+
+ screen_change_alt(screen, set);
+ }
+
+ break;
+ case 1048:
+ if (dec) {
+ /*
+ * XTERM-ASBCS: alternate-screen-buffer-cursor-state
+ * This has the same effect as DECSC/DECRC, but uses a
+ * separate state buffer. It is usually used in
+ * combination with alternate screen buffers to provide
+ * stacked state storage.
+ */
+ if (set)
+ screen_save_state(screen, &screen->saved_alt);
+ else
+ screen_restore_state(screen, &screen->saved_alt);
+ }
+
+ break;
+ case 1049:
+ if (dec) {
+ /*
+ * XTERM-ASBX: alternate-screen-buffer-extended
+ * This combines XTERM-ASBPE and XTERM-ASBCS somewhat.
+ * When enabling, state is saved, alternate screen
+ * buffer is activated and cleared.
+ * When disabled, alternate screen buffer is cleared,
+ * then normal screen buffer is enabled and state is
+ * restored.
+ */
+ if (set)
+ screen_save_state(screen, &screen->saved_alt);
+
+ screen_reset_page(screen, screen->page_alt);
+ screen_change_alt(screen, set);
+
+ if (!set)
+ screen_restore_state(screen, &screen->saved_alt);
+ }
+