-int faccessible(char *filename);
-int fcreatedir(char* relative_dir);
-int fwriteable(char *filename);
-string_list_type dsubdirs(char *rel_path, char* expected_file);
-string_list_type dfiles(char *rel_path, char* expected_file);
+int faccessible(const char *filename);
+int fcreatedir(const char* relative_dir);
+int fwriteable(const char *filename);
+FILE * opendata(const char * filename, const char * mode);
+string_list_type dsubdirs(const char *rel_path, const char* expected_file);
+string_list_type dfiles(const char *rel_path, const char* glob, const char* exception_str);