implement \n on textwindow

arch/textwindow.cc

@@ -51,6 +51,18 @@ void TextWindow::print(const char* str, size_t length, CGA::Attribute attrib) {
     for(unsigned i=0; i<length; i++){
         unsigned x_now, y_now;
         getPos(x_now, y_now);
+        if(str[i] == '\n'){
+            x_now = 0;
+            if(from_row + y_now >= to_row-1){
+                //TODO scrollUp()
+            }
+            else{
+                y_now++;
+            }
+            setPos(x_now, y_now);
+            return;
+        }
+
         CGA::show(x_now, y_now, str[i], attrib);
         if(from_col+x_now >= to_col-1){
             x_now = 0;