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1 files changed, 39 insertions, 0 deletions

diff --git a/sys/mtio/mtpos.x b/sys/mtio/mtpos.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	"mtio.h"
+
+# MTPOSITION -- Position the device to the indicated file and record.
+# We are called to position the device by device name, not to position
+# an open magtape file.
+
+procedure mtposition (mtname, file, record)
+
+char	mtname[ARB]		#I device to be positioned
+int	file			#I desired file number
+int	record			#I desired record number
+
+int	junk
+pointer	sp, mtspec, device, devcap
+errchk	mtparse, mtopen
+int	mtopen()
+
+begin
+	call smark (sp)
+	call salloc (device, SZ_FNAME, TY_CHAR)
+	call salloc (mtspec, SZ_FNAME, TY_CHAR)
+	call salloc (devcap, SZ_DEVCAP, TY_CHAR)
+
+	# Get device name (including node! prefix) from mtname.
+	call mtparse (mtname,
+	    Memc[device], SZ_FNAME, junk, junk, Memc[devcap], SZ_DEVCAP)
+
+	# Encode new mtname and open device to position to desired file.
+	# Note that we do not return until positioning is complete.  Thus,
+	# "mtposition(device,1)" is a rewind with wait.
+
+	call mtencode (Memc[mtspec], SZ_FNAME,
+	    Memc[device], file, record, Memc[devcap])
+	call close (mtopen (Memc[mtspec], READ_ONLY, 1))
+
+	call sfree (sp)
+end