From 451fc9a8a4a6ad7e85e81e8186a0061da91b37c9 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Wed, 23 Mar 2016 10:50:37 -0700
Subject: Don't pass negative value to <ctype.h> functions.

---
 autotab.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/autotab.c b/autotab.c
index 278c568..93c3500 100644
--- a/autotab.c
+++ b/autotab.c
@@ -256,14 +256,14 @@ static int fgrep(line_t *list, const char *pattern)
 
 int munge_char(int ch)
 {
+  if (ch < 0 || isalnum(ch) || ch == '_')
+    return TOKEN[0];
   if (isspace(ch) || iscntrl(ch))
     return SPACE[0];
   if (strchr("([{<", ch))
     return OPGRP[0];
   if (strchr(")]}>", ch))
     return CLGRP[0];
-  if (isalnum(ch) || ch == '_')
-    return TOKEN[0];
   return PUNCT[0];
 }
 
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