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-rw-r--r--contrib/isn/isn.h35
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diff --git a/contrib/isn/isn.h b/contrib/isn/isn.h
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+/*-------------------------------------------------------------------------
+ *
+ * isn.h
+ * PostgreSQL type definitions for ISNs (ISBN, ISMN, ISSN, EAN13, UPC)
+ *
+ * Author: German Mendez Bravo (Kronuz)
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ * contrib/isn/isn.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef ISN_H
+#define ISN_H
+
+#include "fmgr.h"
+
+#undef ISN_DEBUG
+#define ISN_WEAK_MODE
+
+/*
+ * uint64 is the internal storage format for ISNs.
+ */
+typedef uint64 ean13;
+
+#define EAN13_FORMAT UINT64_FORMAT
+
+#define PG_GETARG_EAN13(n) PG_GETARG_INT64(n)
+#define PG_RETURN_EAN13(x) PG_RETURN_INT64(x)
+
+extern void initialize(void);
+
+#endif /* ISN_H */