float parsing must be locale independent

json_util.h

@@ -25,6 +25,7 @@ extern struct json_object* json_object_from_file(const char *filename);
 extern int json_object_to_file(char *filename, struct json_object *obj);
 extern int json_object_to_file_ext(char *filename, struct json_object *obj, int flags);
 extern int json_parse_int64(const char *buf, int64_t *retval);
+extern int json_parse_double(const char *buf, double *retval);
 
 
 /**