char *strtok_len (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);
+
/* Construct a boolean term query with the specified prefix (e.g.,
* "id") and search term, quoting term as necessary. Specifically, if
* term contains any non-printable ASCII characters, non-ASCII