1 files changed, 47 insertions, 0 deletions
diff --git a/sys/fio/fmapfn.x b/sys/fio/fmapfn.x
new file mode 100644
index 00000000..20fed43a
--- /dev/null
+++ b/sys/fio/fmapfn.x
@@ -0,0 +1,47 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<syserr.h>
+include	<config.h>
+include	<fio.h>
+
+# FMAPFN -- Map the VFN of an existing file to a packed OSFN.  ERR is returned
+# if there is insufficient information in the VFN database to map the filename.
+# OK is returned if the mapping can be performed, but a status of OK does not
+# imply that the named file exists.
+
+procedure fmapfn (vfn, osfn, maxch)
+
+char	vfn[ARB]		# virtual filename of file to be mapped.
+char	osfn[maxch]		# packed OS filename (output)
+int	maxch
+
+int	status, ip, delim
+pointer	vfd, sp, nodename
+pointer	vfnopen()
+int	vfnmapu(), ki_gnode()
+errchk	vfnopen, vfnmapu, syserrs
+
+begin
+	call smark (sp)
+	call salloc (nodename, SZ_FNAME, TY_CHAR)
+
+	# Map VFN to OSFN.
+
+	vfd = vfnopen (vfn, READ_ONLY)
+	status = vfnmapu (vfd, osfn, maxch)
+	call vfnclose (vfd, VFN_NOUPDATE)
+
+	if (status == ERR)
+	    call syserrs (SYS_FNOSUCHFILE, vfn)
+
+	# If the file resides on the local node strip the node name, returning
+	# a legal host system filename as the result.
+
+	if (ki_gnode (osfn, Memc[nodename], delim) == 0)
+	    ip = delim + 1
+	else
+	    ip = 1
+
+	call osfn_pkfname (osfn[ip], osfn, maxch)
+	call sfree (sp)
+end