1 files changed, 51 insertions, 0 deletions
diff --git a/pkg/images/tv/iis/iism70/iisrd.x b/pkg/images/tv/iis/iism70/iisrd.x
new file mode 100644
index 00000000..20e99cb2
--- /dev/null
+++ b/pkg/images/tv/iis/iism70/iisrd.x
@@ -0,0 +1,51 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <mach.h>
+include "iis.h"
+
+# IISRD -- Read data from IIS.  Reads are packed when can.
+# The data is line-flipped.
+
+procedure iisrd (chan, buf, nbytes, offset)
+
+int	chan[ARB]
+short	buf[ARB]
+int	nbytes
+long	offset
+
+long	off1, off2 
+int	nchars, thing_count, tid, y1, y2, x
+int	or()
+include "iis.com"
+
+begin
+	# Convert to chars and clip at the top of the display.
+	off1 = (offset - 1) / SZB_CHAR + 1
+	off2 = min (IIS_XDIM * IIS_YDIM, (offset + nbytes - 1) / SZB_CHAR) + 1
+	nchars = off2 - off1
+
+	y1 = (off1-1           ) / IIS_XDIM
+	y2 = (off2-1 - IIS_XDIM) / IIS_XDIM
+	y2 = max (y1,y2)
+
+	# Pack only if start at x=0
+	x = (off1 - 1) - y1 * IIS_XDIM
+	if ( x == 0 )
+	    tid = IREAD+PACKED
+	else
+	    tid = IREAD
+
+	# If only a few chars, don't pack...have trouble with count of 1
+	# and this maeks code same as iiswr.x
+	if ( nchars < 4 )
+	    tid = IREAD
+
+	thing_count = nchars
+
+	call iishdr (tid, thing_count, REFRESH,
+	     or (x, ADVXONTC), or (IIS_YDIM-1-y2, ADVYONXOV), iframe, iplane)
+	if ( tid == IREAD)
+	    call iisio (buf, nbytes)
+	else
+	    call iispio (buf, y2 - y1 + 1)
+end