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1 files changed, 39 insertions, 0 deletions

diff --git a/sys/fio/fdevtx.x b/sys/fio/fdevtx.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<syserr.h>
+include	<config.h>
+include	<fio.h>
+
+# FDEVTX -- Install a new text file device in the device table, if it has
+# not already been installed.
+
+procedure fdevtx (zget, zput, zfls, zstt, zcls, zsek, znot)
+
+int	i, dev_epa
+extern	zget(), zput(), zfls(), zstt(), zcls(), zsek(), znot()
+include	<fio.com>
+
+begin
+	# Search the device table to determine if the device has already been
+	# installed.  The ZDEV array indices the device table by the EPA of
+	# each device driver.
+
+	call zlocpr (zget, dev_epa)
+	for (i=1;  i < next_dev;  i=i+LEN_DTE)
+	    if (zdev[i] == dev_epa)
+		return
+
+	# Device not found.  Install the new device in the table.
+	next_dev = next_dev + LEN_DTE
+	if (next_dev > LEN_DEVTBL)
+	    call syserr (SYS_FDEVTBLOVFL)
+	else {
+	    call zlocpr (zget, zdev[i])
+	    call zlocpr (zput, zdev[i+1])
+	    call zlocpr (zfls, zdev[i+2])
+	    call zlocpr (zstt, zdev[i+3])
+	    call zlocpr (zcls, zdev[i+4])
+	    call zlocpr (zsek, zdev[i+5])
+	    call zlocpr (znot, zdev[i+6])
+	}
+end