1 files changed, 74 insertions, 0 deletions
diff --git a/sys/ki/ktznot.x b/sys/ki/ktznot.x
new file mode 100644
index 00000000..8185b734
--- /dev/null
+++ b/sys/ki/ktznot.x
@@ -0,0 +1,74 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<mach.h>
+include	<config.h>
+include	"ki.h"
+
+# KT_ZNOT -- Note the file position of a text device.  We are called only if
+# the device does not reside on the local node.
+
+procedure kt_znot (device, chan, loffset)
+
+int	device			# device driver code
+int	chan			# channel assigned device
+long	loffset			# receives the file offset
+
+pointer	bd, rp
+int	server, status
+int	ki_sendrcv()
+long	ki_decode()
+include	"kichan.com"
+include	"kii.com"
+define	physnote_ 91
+
+begin
+	bd = k_bufp[chan]
+
+	# The buffering of text file input and output complicates the seek and
+	# note functions.  Our solution is [1] for an output file, flush the
+	# output and then call the kernel server to note the file position, and
+	# [2] for an input file, have the kernel server note the offset of each
+	# input line of text in the header area of each input record.
+
+	if (B_ITOP(bd) >= B_BUFPTR(bd)) {
+	    # Input file.
+
+	    rp = B_RP(bd)
+
+	    # Check for end of input buffer.
+	    if (rp >= B_ITOP(bd))
+		goto physnote_
+
+	    # If already part way into line, return offset of the next line.
+	    if (B_CI(bd) > 0) {
+		rp = rp + ki_decode (R_RECLEN(rp), NCHARS_INT)
+		if (rp >= B_ITOP(bd))
+		    goto physnote_
+	    }
+
+	    # Decode seek offset from record header of next line to be
+	    # read.  The seek offset is encoded as a char sequence.
+
+	    loffset = ki_decode (R_SEKOFF(rp), NCHARS_LONG)
+	    return
+
+	} else {
+	    # Output file.
+
+	    call ki_flushtx (device, chan, status)
+	    if (status == ERR)
+		return
+	}
+
+physnote_
+
+	# Physically call the kernel server to note the file offset.
+
+	server   = k_node[chan]
+	p_arg[1] = k_oschan[chan]
+
+	if (ki_sendrcv (server, device, TX_NOT) == ERR)
+	    loffset = ERR
+	else
+	    loffset = ki_decode (p_sbuf, NCHARS_LONG)
+end