From 32ceded7724ca14e43a10cc88d0a9a591220b37e Mon Sep 17 00:00:00 2001
From: MysterD <myster@d>
Date: Fri, 28 Jan 2022 00:00:25 -0800
Subject: [PATCH] Prevent rendering of unimplemented characters

---
 src/pc/djui/djui_font.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/pc/djui/djui_font.c b/src/pc/djui/djui_font.c
index 96f408ddf..cbeab3b0b 100644
--- a/src/pc/djui/djui_font.c
+++ b/src/pc/djui/djui_font.c
@@ -37,6 +37,8 @@ static const Gfx djui_font_normal_text_settings[] = {
 
 static void djui_font_normal_render_char(char c) {
     extern const u8* const font_normal_chars[];
+    // replace undisplayable characters
+    if (c < ' ' || (u8)c > ('~' + 1)) { c = '?'; }
     void* fontChar = (void*)font_normal_chars[c - '!'];
     if (fontChar == NULL) { fontChar = (void*)font_normal_chars[94]; }
 
@@ -68,6 +70,8 @@ static const struct DjuiFont sDjuiFontNormal = {
 
 static void djui_font_title_render_char(char c) {
     extern const u8* const font_title_chars[];
+    // replace undisplayable characters
+    if (c < ' ' || (u8)c > ('~' + 1)) { c = '?'; }
     djui_gfx_render_texture(font_title_chars[c - '!'], 64, 64, 32);
 }