+#include <gl/xalloc.h>
+#include <gl/c-xvasprintf.h>
+#include <stdlib.h>
+
+#ifdef ODF_READ_SUPPORT
+static const bool ODF_READING_SUPPORTED = true;
+#else
+static const bool ODF_READING_SUPPORTED = false;
+#endif
+
+#ifdef GNM_READ_SUPPORT
+static const bool GNM_READING_SUPPORTED = true;
+#else
+static const bool GNM_READING_SUPPORTED = false;
+#endif
+
+void
+spreadsheet_ref (struct spreadsheet *s)
+{
+ s->ref_cnt++;
+}
+
+void
+spreadsheet_unref (struct spreadsheet *s)
+{
+ switch (s->type)
+ {
+ case SPREADSHEET_ODS:
+ assert (ODF_READING_SUPPORTED);
+ ods_unref (s);
+ break;
+
+ case SPREADSHEET_GNUMERIC:
+ assert (GNM_READING_SUPPORTED);
+ gnumeric_unref (s);
+ break;
+ default:
+ NOT_REACHED ();
+ break;
+ }
+}