Initial commit

1 files changed, 30 insertions, 0 deletions

diff --git a/sys/osb/bitmov.x b/sys/osb/bitmov.x
new file mode 100644
index 00000000..f6784b2a
--- /dev/null
+++ b/sys/osb/bitmov.x
@@ -0,0 +1,30 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<mach.h>
+
+# BITMOV -- Move a sequence of bits in a bit array of arbitrary length.
+
+procedure bitmov (a, a_off, b, b_off, nbits)
+
+int	a[ARB]		# input bit array
+int	a_off		# first bit to be moved
+int	b[ARB]		# output bit array
+int	b_off		# first bit to be written
+int	nbits		# number of bits to be moved
+
+int	ip, op, ip_top, nbits_left
+int	bitupk()
+
+begin
+	ip_top = a_off + nbits - NBITS_INT
+	op = b_off
+
+	for (ip = a_off;  ip <= ip_top;  ip = ip + NBITS_INT) {
+	    call bitpak (bitupk(a,ip,NBITS_INT), b, op, NBITS_INT)
+	    op = op + NBITS_INT
+	}
+
+	nbits_left = (a_off + nbits) - ip
+	if (nbits_left > 0)
+	    call bitpak (bitupk(a,ip,nbits_left), b, op, nbits_left)
+end