Save and restore cursor

terminalframebuffer.cpp

@@ -63,7 +63,7 @@ DrawState::DrawState( int s_width, int s_height )
     cursor_col( 0 ), cursor_row( 0 ),
     combining_char_col( 0 ), combining_char_row( 0 ), tabs( s_width ),
     scrolling_region_top_row( 0 ), scrolling_region_bottom_row( height - 1 ),
-    renditions(),
+    renditions(), save(),
     next_print_will_wrap( false ), origin_mode( false ), auto_wrap_mode( true )
 {
   for ( int i = 0; i < width; i++ ) {
@@ -270,3 +270,31 @@ void Framebuffer::apply_renditions_to_current_cell( void )
 
   this_cell->renditions = ds.get_renditions();
 }
+
+SavedCursor::SavedCursor()
+  : cursor_col( 0 ), cursor_row( 0 ),
+    renditions(),
+    auto_wrap_mode( true ),
+    origin_mode( false )
+{}
+
+void DrawState::save_cursor( void )
+{
+  save.cursor_col = cursor_col;
+  save.cursor_row = cursor_row;
+  save.renditions = renditions;
+  save.auto_wrap_mode = auto_wrap_mode;
+  save.origin_mode = origin_mode;
+}
+
+void DrawState::restore_cursor( void )
+{
+  cursor_col = save.cursor_col;
+  cursor_row = save.cursor_row;
+  renditions = save.renditions;
+  auto_wrap_mode = save.auto_wrap_mode;
+  origin_mode = save.origin_mode;
+
+  snap_cursor_to_border();
+  new_grapheme();
+}

terminalframebuffer.hpp

@@ -31,6 +31,18 @@ namespace Terminal {
     Row( size_t s_width );
   };
 
+  class SavedCursor {
+  public:
+    int cursor_col, cursor_row;
+    std::vector<int> renditions;
+    /* character set shift state */
+    bool auto_wrap_mode;
+    bool origin_mode;
+    /* state of selective erase */
+
+    SavedCursor();
+  };
+
   class DrawState {
   private:
     int width, height;
@@ -47,6 +59,8 @@ namespace Terminal {
 
     std::vector<int> renditions;
 
+    SavedCursor save;
+
   public:
     bool next_print_will_wrap;
     bool origin_mode;
@@ -82,6 +96,9 @@ namespace Terminal {
     void add_rendition( int x ) { renditions.push_back( x ); }
     const std::vector<int> get_renditions( void ) { return renditions; }
 
+    void save_cursor( void );
+    void restore_cursor( void );
+
     DrawState( int s_width, int s_height );
   };
 

terminalfunctions.cpp

@@ -274,3 +274,17 @@ void CSI_SGR( Framebuffer *fb, Dispatcher *dispatch )
 }
 
 static Function func_CSI_SGR( CSI, "m", CSI_SGR );
+
+/* save and restore cursor */
+void Esc_DECSC( Framebuffer *fb, Dispatcher *dispatch __attribute((unused)) )
+{
+  fb->ds.save_cursor();
+}
+
+void Esc_DECRC( Framebuffer *fb, Dispatcher *dispatch __attribute((unused)) )
+{
+  fb->ds.restore_cursor();
+}
+
+static Function func_Esc_DECSC( ESCAPE, "7", Esc_DECSC );
+static Function func_Esc_DECRC( ESCAPE, "8", Esc_DECRC );