--- libaitwww/src/tools.c	2012/07/31 22:59:33	1.2.6.2
+++ libaitwww/src/tools.c	2012/08/01 00:40:41	1.3
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@elwix.org>
 *
 * $Author: misho $
-* $Id: tools.c,v 1.2.6.2 2012/07/31 22:59:33 misho Exp $
+* $Id: tools.c,v 1.3 2012/08/01 00:40:41 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -60,12 +60,12 @@ www_cmp(const char *ct, const char *s)
 
 	assert(ct && s);
 
-	while (isspace(*ct))
+	while (isspace((int) *ct))
 		ct++;
 
 	if (!(sc = strchr(ct, ';')))
 		sc = strchr(ct, '\x0');
-	while (isspace(*(sc - 1)))
+	while (isspace((int) *(sc - 1)))
 		sc--;
 
 	if (strlen(s) != sc - ct)
@@ -87,7 +87,7 @@ www_cmptype(const char *ct, const char *type)
 
 	assert(ct && type);
 
-	while (isspace(*ct))
+	while (isspace((int) *ct))
 		ct++;
 
 	if (!(sl = strchr(ct, '/')))
@@ -162,7 +162,8 @@ www_unescape(char * __restrict str)
 {
 	register int i, j;
 
-	assert(str);
+	if (!str)
+		return;
 
 	for (i = j = 0; str[j]; i++, j++) {
 		str[i] = str[j];