From de84f57a9c2a45f5dc53584c07fd6e4fb1aedbf7 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <github@thinkyhead.com>
Date: Fri, 6 Oct 2017 23:57:11 -0500
Subject: [PATCH] Patch SD file draw bug

---
 Marlin/src/lcd/ultralcd_impl_DOGM.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Marlin/src/lcd/ultralcd_impl_DOGM.h b/Marlin/src/lcd/ultralcd_impl_DOGM.h
index 159e493e99..d437d040ed 100644
--- a/Marlin/src/lcd/ultralcd_impl_DOGM.h
+++ b/Marlin/src/lcd/ultralcd_impl_DOGM.h
@@ -928,14 +928,15 @@ static void lcd_implementation_status_screen() {
       if (!PAGE_CONTAINS(row_y1, row_y2)) return;
 
       uint8_t n = LCD_WIDTH - (START_COL) - 1;
+      char c;
       if (longFilename[0]) {
         filename = longFilename;
-        longFilename[n] = '\0';
+        longFilename[n] = '\0'; // cutoff at screen edge
       }
 
       if (isDir) lcd_print(LCD_STR_FOLDER[0]);
 
-      while (char c = *filename) {
+      while ((c = *filename) && n > 0) {
         n -= lcd_print_and_count(c);
         filename++;
       }