From 0dbd2a14d7ef39fba94fcf40e61fee9da32f7320 Mon Sep 17 00:00:00 2001
From: Paul Klinger <klinger.paul@gmail.com>
Date: Tue, 12 Feb 2019 18:26:26 +0100
Subject: [PATCH] truncate display_block area if too large

---
 lcd.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lcd.c b/lcd.c
index f19c8e9..2c5460a 100644
--- a/lcd.c
+++ b/lcd.c
@@ -465,7 +465,10 @@ uint8_t lcd_check_buffer(uint8_t x, uint8_t y) {
     return displayBuffer[(y / (DISPLAY_HEIGHT/8))][x] & (1 << (y % (DISPLAY_HEIGHT/8)));
 }
 void lcd_display_block(uint8_t x, uint8_t line, uint8_t width) {
-    if ( x+width > (DISPLAY_WIDTH) || line > (DISPLAY_HEIGHT/8-1)) return;
+    if (line > (DISPLAY_HEIGHT/8-1)) return;
+    if (x + width > DISPLAY_WIDTH - 1) {
+        width = DISPLAY_WIDTH - x - 1;
+    }
     lcd_goto_xpix_y(x,line);
     lcd_data(&displayBuffer[line][x], width);
 }