From 2c7bc9c1c2f9f8830114b67648ae913025d15c5f Mon Sep 17 00:00:00 2001
From: Andrew Borodin <aborodin@vmail.ru>
Date: Thu, 13 May 2010 17:21:49 +0400
Subject: [PATCH] Ticket #2157: fixed tty_fill_region() for ncurses-based TTY
 layer.

If filled region is larger than screen, NCurses doesn't fill it
unlike S-Lang. This patch fixes such behaviour: only visible part
of region is filled.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
---
 lib/tty/tty-ncurses.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/lib/tty/tty-ncurses.c b/lib/tty/tty-ncurses.c
index c59feacf3..b7a521385 100644
--- a/lib/tty/tty-ncurses.c
+++ b/lib/tty/tty-ncurses.c
@@ -295,6 +295,31 @@ tty_fill_region (int y, int x, int rows, int cols, unsigned char ch)
 {
     int i;
 
+    if (y < 0)
+    {
+        rows += y;
+
+        if (rows <= 0)
+            return;
+
+        y = 0;
+    }
+
+    if (x < 0)
+    {
+        cols += x;
+
+        if (cols <= 0)
+            return;
+
+        x = 0;
+    }
+
+    if (y + rows > LINES)
+        rows = LINES - y;
+    if (x + cols > COLS)
+        cols = COLS - x;
+
     for (i = 0; i < rows; i++)
     {
         move (y + i, x);