char *strtok_len (char *s, const char *delim, size_t *len);
+/* 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,