From 9c954238bdfe001e418085f3fc9f4c741e29f910 Mon Sep 17 00:00:00 2001
From: Jacob Nevins <jacobn@chiark.greenend.org.uk>
Date: Tue, 5 Sep 2006 22:08:00 +0000
Subject: [PATCH] CSI 3 J now clears the scrollback, as in xterm.

[originally from svn r6847]
[this svn revision also touched putty-wishlist]
---
 terminal.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/terminal.c b/terminal.c
index b88fe069..f5603a83 100644
--- a/terminal.c
+++ b/terminal.c
@@ -3346,10 +3346,17 @@ static void term_out(Terminal *term)
 			break;
 		      case 'J':       /* ED: erase screen or parts of it */
 			{
-			    unsigned int i = def(term->esc_args[0], 0) + 1;
-			    if (i > 3)
-				i = 0;
-			    erase_lots(term, FALSE, !!(i & 2), !!(i & 1));
+			    unsigned int i = def(term->esc_args[0], 0);
+			    if (i == 3) {
+				/* Erase Saved Lines (xterm)
+				 * This follows Thomas Dickey's xterm. */
+				term_clrsb(term);
+			    } else {
+				i++;
+				if (i > 3)
+				    i = 0;
+				erase_lots(term, FALSE, !!(i & 2), !!(i & 1));
+			    }
 			}
 			term->disptop = 0;
 			seen_disp_event(term);