[erlang-questions] Atom Unicode Support
Mon Feb 1 13:08:51 CET 2016
Understood! Thank you.
Founder and Director of R&D
On Mon, Feb 1, 2016 at 12:59 PM, Björn Gustavsson <> wrote:
> On Mon, Feb 1, 2016 at 9:44 AM, José Valim
> <> wrote:
> > So I would say list_to_binary is behaving as expected and that it should
> > change as those "limitations" are there today. Same for port_command, as
> > expects iodata. Or am I missing something?
> My point is that we must look for code in
> OTP that will break when the change to
> the atoms are made.
> As an hypothetical example, say that we
> find the following code in some application:
> Str = atom_to_list(Atom),
> port_command(Port, Cmd, Str)
> We must look at the context to determine
> what we should do. There could be one
> of several solutions, for example:
> 1. If the atoms that can be passed to this
> code have been internally generated we
> could know that the resulting list is always
> safe to send to the port. In that case we
> don't need to update the code.
> 2. If the origin of the atom is unknown,
> and the driver cannot handle UTF-8,
> the solution could be to return an error
> to the caller if the atom contains
> non-latin1 characters.
> 3. If the driver can handle UTF-8 or can
> be modified to handle UTF-8, the solution
> could be to use atom_to_binary(Atom, utf8)
> instead of atom_to_list/1.
> Basically, we must look at every atom_to_list/1
> in the OTP code base and determine whether
> it is safe or if it must be modified in some way.
> Björn Gustavsson, Erlang/OTP, Ericsson AB
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