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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# FM_REBUILD -- Rebuild a datafile.  This has no affect on the logical content
+# of a datafile, but is desirable for efficiency reasons to eliminate waste
+# space (e.g., from deleted lfiles), and render the file structures logically
+# contiguous within the file, increasing i/o access efficiency.
+
+procedure fm_rebuild (dfname)
+
+char	dfname[ARB]		#I datafile name
+
+pointer	sp, tfname
+errchk	fm_copy, fm_delete, fm_rename
+
+begin
+	call smark (sp)
+	call salloc (tfname, SZ_PATHNAME, TY_CHAR)
+
+	# The copy operation rebuilds a datafile.
+	call mktemp (dfname, Memc[tfname], SZ_PATHNAME)
+	call fm_copy (dfname, Memc[tfname])
+	call fm_delete (dfname)
+	call fm_rename (Memc[tfname], dfname)
+
+	call sfree (sp)
+end