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BSD 4.3

#	GCOMP(1)
#
#	Produce complement of file specification
#
#	William H. Mitchell, revised by Thomas Hicks
#
#	Last modified 8/14/84
#

procedure main(args)
   local a, dir, ent, files
   files := mkftbl()   
   while a := get(args) do
      files[a] := &null
   every files["." | ".."] := &null
   files := sort(files)
   while a := get(files) do
      write((\a[2],a[1]))		# a[1] written iff a[2] has value
end

procedure mkftbl()			# make a table of file names from
   local line				# the current directory
   line := read(open("echo * .*","rp"))
   return str2tbl(line,' ')
end

procedure str2tbl(str,delim)		# convert a delmited string into
    local tbl				# a table
    tbl := table(1)
    str ? {
	while tbl[(tab(upto(delim)))] := 1 do
	    move(1)
	tbl["" ~== tab(0)] := 1
	}
    return tbl
end

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