+#include <gl/xalloc.h>
+#include <gl/c-xvasprintf.h>
+#include <stdlib.h>
+
+
+void
+spreadsheet_destroy (struct spreadsheet *s)
+{
+ switch (s->type)
+ {
+ case SPREADSHEET_ODS:
+ ods_destroy (s);
+ break;
+ case SPREADSHEET_GNUMERIC:
+ gnumeric_destroy (s);
+ break;
+ default:
+ NOT_REACHED ();
+ break;
+ }
+}
+
+
+struct casereader *
+spreadsheet_make_reader (struct spreadsheet *s, const struct spreadsheet_read_options *opts)
+{
+ if ( s->type == SPREADSHEET_ODS)
+ return ods_make_reader (s, opts);
+ if ( s->type == SPREADSHEET_GNUMERIC)
+ return gnumeric_make_reader (s, opts);
+
+ return NULL;
+}
+
+const char *
+spreadsheet_get_sheet_name (struct spreadsheet *s, int n)
+{
+ if ( s->type == SPREADSHEET_ODS)
+ return ods_get_sheet_name (s, n);
+
+ if ( s->type == SPREADSHEET_GNUMERIC)
+ return gnumeric_get_sheet_name (s, n);
+
+ return NULL;
+}
+
+char *
+spreadsheet_get_sheet_range (struct spreadsheet *s, int n)
+{
+ if ( s->type == SPREADSHEET_ODS)
+ return ods_get_sheet_range (s, n);
+
+ if ( s->type == SPREADSHEET_GNUMERIC)
+ return gnumeric_get_sheet_range (s, n);
+
+ return NULL;
+}
+
+
+#define RADIX 26
+
+static void
+reverse (char *s, int len)
+{
+ int i;
+ for (i = 0; i < len / 2; ++i)
+ {
+ char tmp = s[len - i - 1];
+ s[len - i -1] = s[i];
+ s[i] = tmp;
+ }
+}
+