From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001 From: Joseph Hunkeler Date: Wed, 8 Jul 2015 20:46:52 -0400 Subject: Initial commit --- sys/mtio/mtpos.x | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 sys/mtio/mtpos.x (limited to 'sys/mtio/mtpos.x') diff --git a/sys/mtio/mtpos.x b/sys/mtio/mtpos.x new file mode 100644 index 00000000..f88946ae --- /dev/null +++ b/sys/mtio/mtpos.x @@ -0,0 +1,39 @@ +# 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 -- cgit