1 files changed, 63 insertions, 0 deletions
diff --git a/sys/fmio/fmcopyo.x b/sys/fmio/fmcopyo.x
new file mode 100644
index 00000000..a6fd0be2
--- /dev/null
+++ b/sys/fmio/fmcopyo.x
@@ -0,0 +1,63 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<syserr.h>
+include	<mach.h>
+include	"fmio.h"
+
+# FM_COPYO -- Copy an existing, open datafile to a new, open but empty
+# datafile, rendering all lfile storage contiguous and omitting deleted
+# lfiles.  Lfile numbers are preserved by the copy operation, hence
+# deleted lfiles will leave holes (zero length lfiles) in the file table.
+
+procedure fm_copyo (old, new)
+
+pointer	old, new		#I FMIO descriptors of source and destination
+
+pointer	o_ft, o_lf
+int	n_szbpage, nlfiles, dpages, npte_perpage, npti, p1, dp, i
+errchk	fmio_bind, syserrs, fm_lfcopy
+int	fmio_extend()
+
+begin
+	call fmio_bind (old)
+	call fmio_bind (new)
+
+	# Scan the file table of the old datafile and determine the number of
+	# data pages required to store the valid lfiles therein.  Note that
+	# the page size may differ in the old and new datafiles.
+
+	o_ft = FM_FTABLE(old)
+	n_szbpage = FM_SZBPAGE(new)
+	nlfiles = min (FM_NLFILES(old), FM_NLFILES(new))
+	dpages = 0
+
+	do i = 0, nlfiles {
+	    o_lf = o_ft + i * LEN_FTE
+	    if (LF_FSIZE(o_lf) <= 0 || and(LF_FLAGS(o_lf),LFF_ALLOCATED) == 0)
+		next
+	    dpages = dpages + (LF_FSIZE(o_lf) + n_szbpage-1) / n_szbpage
+	}
+
+	# Now allocate enough lfile 0 space in the new datafile to permit
+	# contiguous storage of the entire datafile page table.
+
+	npte_perpage = n_szbpage / (SZ_SHORT * SZB_CHAR)
+	npti = (dpages + npte_perpage-1) / npte_perpage
+	if (npti > FM_PTILEN(new))
+	    call syserrs (SYS_FMPTIOVFL, FM_DFNAME(new))
+
+	for (p1=FM_PTINPTI(new)+1;  p1 <= npti;  p1=p1+1) {
+	    dp = fmio_extend (new, PT_LFILE, 1)
+	    if (dp == ERR)
+		call syserrs (SYS_FMCOPYO, FM_DFNAME(new))
+	    Memi[FM_PTINDEX(new)+p1-1] = dp
+	    FM_PTINPTI(new) = p1
+	    FM_DHMODIFIED(new) = YES
+	}
+
+	# Copy the lfiles (excluding the page table).
+	do i = 1, nlfiles
+	    call fm_lfcopy (old, i, new, i)
+
+	call fm_sync (new)
+end