+
+/* Copy string array value.
+ * The return value is only 'safe' provided we don't allocate anything
+ * further on the OCaml heap (ie. cannot trigger the OCaml GC) because
+ * that could move the strings around.
+ */
+char **
+ocaml_guestfs_strings_val (guestfs_h *g, value sv)
+{
+ CAMLparam1 (sv);
+ char **r;
+ unsigned int i;
+
+ r = guestfs_safe_malloc (g, sizeof (char *) * (Wosize_val (sv) + 1));
+ for (i = 0; i < Wosize_val (sv); ++i)
+ r[i] = String_val (Field (sv, i));
+ r[i] = NULL;
+
+ CAMLreturnT (char **, r);
+}
+
+/* Free array of strings. */
+void
+ocaml_guestfs_free_strings (char **argv)
+{
+ /* Don't free the actual strings - they are String_vals on
+ * the OCaml heap.
+ */
+ free (argv);
+}