1 files changed, 45 insertions, 0 deletions
diff --git a/src/backend/lib/bit.c b/src/backend/lib/bit.c
new file mode 100644
index 0000000000..0d7d316745
--- /dev/null
+++ b/src/backend/lib/bit.c
@@ -0,0 +1,45 @@
+/*-------------------------------------------------------------------------
+ *
+ * bit.c--
+ *    Standard bit array code.
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *    $Header$
+ *
+ *-------------------------------------------------------------------------
+ */
+
+/*
+ * utils/memutils.h contains declarations of the functions in this file
+ */
+#include "utils/memutils.h"	
+
+void
+BitArraySetBit(BitArray bitArray, BitIndex bitIndex)
+{	
+    bitArray[bitIndex/BitsPerByte]
+	|= (1 << (BitsPerByte - (bitIndex % BitsPerByte) - 1));
+    return;
+}
+
+void
+BitArrayClearBit(BitArray bitArray, BitIndex bitIndex)
+{
+    bitArray[bitIndex/BitsPerByte]
+	&= ~(1 << (BitsPerByte - (bitIndex % BitsPerByte) - 1));
+    return;
+}
+
+bool
+BitArrayBitIsSet(BitArray bitArray, BitIndex bitIndex)
+{	
+    return( (bool) (((bitArray[bitIndex / BitsPerByte] &
+		      (1 << (BitsPerByte - (bitIndex % BitsPerByte)
+			     - 1)
+		       )
+		      ) != 0 ) ? 1 : 0) );
+}
+