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1 files changed, 21 insertions, 0 deletions

diff --git a/sys/fio/fnroot.x b/sys/fio/fnroot.x
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--- /dev/null
+++ b/sys/fio/fnroot.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# FNROOT -- Extract the root file name from a virtual file name (or from a
+# machine dependent filename.  If the VFN contains no root name, the null
+# string is returned.  This occurs when the VFN refers to a directory or
+# device, or when the VFN string is a null string.  The number of chars in
+# the root file name is returned as the function value.
+
+int procedure fnroot (vfn, outstr, maxch)
+
+char	vfn[ARB], outstr[maxch]
+int	maxch
+int	root_offset, extn_offset, nchars_root
+int	gstrcpy()
+
+begin
+	call zfnbrk (vfn, root_offset, extn_offset)
+	nchars_root = max(0, min(maxch, extn_offset - root_offset))
+
+	return (gstrcpy (vfn[root_offset], outstr, nchars_root))
+end