char *mutt_strlower (char *);
char *mutt_substrcpy (char *, const char *, const char *, size_t);
char *mutt_substrdup (const char *, const char *);
+char *safe_strcat (char *, size_t, const char *);
+char *safe_strncat (char *, size_t, const char *, size_t);
char *safe_strdup (const char *);
const char *mutt_stristr (const char *, const char *);