Postgres95 1.01 Distribution - Virgin SourcesPG95-1_01

1 files changed, 57 insertions, 0 deletions

diff --git a/src/backend/access/sdir.h b/src/backend/access/sdir.h
new file mode 100644
index 00000000000..030007d39c9
--- /dev/null
+++ b/src/backend/access/sdir.h
@@ -0,0 +1,57 @@
+/*-------------------------------------------------------------------------
+ *
+ * sdir.h--
+ *    POSTGRES scan direction definitions.
+ *
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: sdir.h,v 1.1.1.1 1996/07/09 06:21:09 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef	SDIR_H
+#define SDIR_H
+
+#include "c.h"
+
+/*
+ * ScanDirection was an int8 for no apparent reason. I kept the original
+ * values because I'm not sure if I'll break anything otherwise.  -ay 2/95
+ */
+typedef enum ScanDirection {
+    BackwardScanDirection = -1,
+    NoMovementScanDirection = 0,
+    ForwardScanDirection = 1
+} ScanDirection;
+
+/*
+ * ScanDirectionIsValid --
+ *	True iff scan direciton is valid.
+ */
+#define ScanDirectionIsValid(direction) \
+    ((bool) (BackwardScanDirection <= direction && \
+	     direction <= ForwardScanDirection))
+
+/*
+ * ScanDirectionIsBackward --
+ *	True iff scan direciton is backward.
+ */
+#define ScanDirectionIsBackward(direction) \
+    ((bool) (direction == BackwardScanDirection))
+
+/*
+ * ScanDirectionIsNoMovement --
+ *	True iff scan direciton indicates no movement.
+ */
+#define ScanDirectionIsNoMovement(direction) \
+    ((bool) (direction == NoMovementScanDirection))
+
+/*
+ * ScanDirectionIsForward --
+ *	True iff scan direciton is forward.
+ */
+#define ScanDirectionIsForward(direction) \
+    ((bool) (direction == ForwardScanDirection))
+
+#endif	/* SDIR_H */