From 8a849bc85a1d59ffc77e6bff1aa3da2d4bcd746c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20G=C3=B6ttsche?= <cgzones@googlemail.com>
Date: Fri, 11 Sep 2020 19:27:56 +0200
Subject: Call character checking function with unsigned char

See https://wiki.sei.cmu.edu/confluence/display/c/STR37-C.+Arguments+to+character-handling+functions+must+be+representable+as+an+unsigned+char
---
 CategoriesPanel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'CategoriesPanel.c')

diff --git a/CategoriesPanel.c b/CategoriesPanel.c
index 8a1e16df..c12b3905 100644
--- a/CategoriesPanel.c
+++ b/CategoriesPanel.c
@@ -81,7 +81,7 @@ static HandlerResult CategoriesPanel_eventHandler(Panel* super, int ch) {
          break;
       }
       default:
-         if (ch < 255 && isalpha(ch))
+         if (0 < ch && ch < 255 && isalpha((unsigned char)ch))
             result = Panel_selectByTyping(super, ch);
          if (result == BREAK_LOOP)
             result = IGNORED;
-- 
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