console: add newline function

kmscon_console_newline() can be used to produce a newline. Writing \n doesn't
work as this would write \n as character into the cell and not produce a
newline.
The console does not perform any parsing so we provide a separate function.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

src/console.c

@@ -375,3 +375,16 @@ void kmscon_console_write(struct kmscon_console *con,
 	kmscon_buffer_write(con->cells, con->cursor_x, con->cursor_y, ch);
 	con->cursor_x++;
 }
+
+void kmscon_console_newline(struct kmscon_console *con)
+{
+	if (!con)
+		return;
+
+	con->cursor_x = 0;
+	con->cursor_y++;
+	if (con->cursor_y >= con->cells_y) {
+		con->cursor_y--;
+		kmscon_buffer_rotate(con->cells);
+	}
+}

src/console.h

@@ -104,3 +104,4 @@ void kmscon_console_map(struct kmscon_console *con);
 
 void kmscon_console_write(struct kmscon_console *con,
 						const struct kmscon_char *ch);
+void kmscon_console_newline(struct kmscon_console *con);