+/* Const version of strtok_len. */
+const char *strtok_len_c (const char *s, const char *delim, size_t *len);
+
+/* Return a talloced string with str sanitized.
+ *
+ * Whitespace characters (tabs and newlines) are replaced with spaces,
+ * non-printable characters with question marks.
+ */
+char *sanitize_string (const void *ctx, const char *str);
+