On Wed, Oct 24, 2018 at 12:43 AM luigi scarso <luigi.scarso@gmail.com> wrote:


On Tue, Oct 23, 2018 at 11:44 PM Marcel Krüger <tex@2krueger.de> wrote:
Hi,

I think there is a bug in `io.open` in --safer mode:

    \directlua{
      io.open(tex.jobname .. '.tex'):close()
    }
    \bye

If this document is run with `luatex --safer` it leads to `bad argument #1 to 'gsub' (string expected, got nil)`.

The problem is a missing `not` in luatex-core.lua, function luatex_io_open_readonly:
The default argument 'r' is used if an explicit argument is given and when no "how" argument
is given it tries to interpret the non existing argument.
hm this is tricky.. we have to check it carefully,
these "safer" modes are  quite complicated things.

We have committed a patch that also set debug=nil, 
--- so statistics using debug doesn't work in --safer .

--
luigi