From 565ba002e90dab150654a141bc305ca4f62776e2 Mon Sep 17 00:00:00 2001
From: Nicholas Marriott <nicholas.marriott@gmail.com>
Date: Mon, 27 Aug 2007 11:21:05 +0000
Subject: [PATCH] Don't scroll screen until trying to write beyond limits.

---
 screen.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/screen.c b/screen.c
index bcd7f611..b78bc6c1 100644
--- a/screen.c
+++ b/screen.c
@@ -1,4 +1,4 @@
-/* $Id: screen.c,v 1.6 2007-08-27 10:08:44 nicm Exp $ */
+/* $Id: screen.c,v 1.7 2007-08-27 11:21:05 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -621,15 +621,16 @@ screen_sequence(struct screen *s, u_char *ptr)
 void
 screen_write_character(struct screen *s, u_char ch)
 {
+	if (s->cx > screen_last_x(s)) {
+		s->cx = 0;
+		screen_cursor_down_scroll(s, 1);
+	}
+
 	s->grid_data[s->cy][s->cx] = ch;
 	s->grid_attr[s->cy][s->cx] = s->attr;
 	s->grid_colr[s->cy][s->cx] = s->colr;
 
 	s->cx++;
-	if (s->cx > screen_last_x(s)) {
-		s->cx = 0;
-		screen_cursor_down_scroll(s, 1);
-	}
 }
 
 /* Move cursor up and scroll if necessary. */
@@ -647,7 +648,7 @@ screen_cursor_up_scroll(struct screen *s, u_int ny)
 void
 screen_cursor_down_scroll(struct screen *s, u_int ny)
 {
-	if (screen_last_y(s) - s->cy < ny) {
+	if (s->cy + ny > screen_last_y(s)) {
 		screen_scroll_up(s, ny - (screen_last_y(s) - s->cy));
 		s->cy = screen_last_y(s);
 	} else