From eef59d150e9abed5e04d6514bbb08ba3628abf94 Mon Sep 17 00:00:00 2001
From: Robin Stuart <rstuart114@gmail.com>
Date: Thu, 11 May 2017 20:15:10 +0100
Subject: [PATCH] Prevent control characters from corrupting SVG

Bug fix by Maikel Houthuijzen
---
 backend/svg.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/backend/svg.c b/backend/svg.c
index aab31bd1..ced19a45 100644
--- a/backend/svg.c
+++ b/backend/svg.c
@@ -206,6 +206,13 @@ int svg_plot(struct zint_symbol *symbol) {
     }
     addon[r] = '\0';
 
+    /* Don't include control characters in output text */
+    for(i = 0; i < ustrlen(local_text); i++) {
+        if (local_text[i] < ' ') {
+            local_text[i] = ' ';
+        }
+    }
+    
     if (ustrlen(local_text) != 0) {
         textoffset = 9;
     } else {