+#include <sys/types.h>
+
+/*
+ * tools
+ */
+char *str_tolower (char*);
+char *str_substrcpy (char*, const char*, const char*, size_t);
+char *str_substrdup (const char*, const char*);
+int str_eq (const char*, const char*);
+const char *str_isstr (const char*, const char*);
+void str_skip_trailws (char*);