--- parser3/src/classes/math.C	2015/06/02 18:46:05	1.76
+++ parser3/src/classes/math.C	2015/09/22 23:53:56	1.77
@@ -22,7 +22,7 @@
 extern "C" char *crypt(const char* , const char* );
 #endif
 
-volatile const char * IDENT_MATH_C="$Id: math.C,v 1.76 2015/06/02 18:46:05 moko Exp $";
+volatile const char * IDENT_MATH_C="$Id: math.C,v 1.77 2015/09/22 23:53:56 moko Exp $";
 
 // defines
 
@@ -112,9 +112,10 @@ static void math2(Request& r, MethodPara
 
 MATH2(pow)
 
-inline bool is_salt_body_char(int c) {
+inline bool is_salt_body_char(unsigned char c) {
 	return pa_isalnum(c) || c == '.' || c=='/';
 }
+
 static size_t calc_prefix_size(const char* salt) {
 	if(strlen(salt)) {
 		if(!is_salt_body_char((unsigned char)salt[0])) { // $...  {...