$NetBSD: patch-az,v 1.1 2005/12/29 23:31:36 joerg Exp $

--- src/common/msgid.c.orig	2005-12-30 00:11:24.000000000 +0100
+++ src/common/msgid.c
@@ -320,9 +320,9 @@ char *s_msgid_rfc_to_fido(int *origid_fl
 	 */
 	node.domain[0] = 0;
 	p = id;
-	hexflag = isxdigit(*p) && *p!='0';
+	hexflag = isxdigit((unsigned char)*p) && *p!='0';
 	for(p++, i=0; i<7 && *p && *p!='%'; i++, p++)
-	    if(!isxdigit(*p))
+	    if(!isxdigit((unsigned char)*p))
 		hexflag = FALSE;
 	if(hexflag && *p=='%')		/* Domain part follows */
 	{