My program doesn't speak Portugese!

[David Given <dg@...>]

I've just had a report that WordGrinder is failing on a system with a
Portugese locale. This turns out to be because it's got localised errno
strings. So, my code, which does this:

    local fp, e = io.open("somefile")
    if e and not e:find("No such file or directory") then
        dosomething()
    end

...gets confused, because the actual string in e is "Arquivo ou
diretório não encontrado".

I *could* do something really evil:

    local _, filenotfound = io.open("/this/file/is/guaranteed/missing")
    if e != filenotfound then
        dosomething()
    end

...but I can't really guarantee that the path doesn't exist.

What I'd really prefer is an errno (and a set of errno constants). But
Lua doesn't expose those. Any suggestions?

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