From fc71572aad9d12209ae608ef3e9c0bfff2a9fc4c Mon Sep 17 00:00:00 2001
From: Hilko Bengen <bengen@hilluzination.de>
Date: Wed, 26 Nov 2014 20:55:22 +0100
Subject: [PATCH] BIFScanner: Make filename->symbol transformation more robust

When trying to build bro from a path that contained a plus sign, an
invalid symbol name for the #ifdef guard was generated.
---
 src/builtin-func.l | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/builtin-func.l b/src/builtin-func.l
index 076d2bf99b..68f627fd53 100644
--- a/src/builtin-func.l
+++ b/src/builtin-func.l
@@ -1,4 +1,5 @@
 %{
+#include <ctype.h>
 #include <string.h>
 #include <unistd.h>
 #include "bif_arg.h"
@@ -223,7 +224,7 @@ void init_alternative_mode()
 
 	for ( char* p = guard; *p; p++ )
 		{
-		if ( strchr("/.-", *p) )
+		if ( !isalnum (*p) )
 			*p = '_';
 		}