[Freeciv-Dev] Re: (PR#13463) New function to eval safety of filenames

["Benoit Hudson" <benoit.hudson@xxxxxxxxx>]

<URL: http://bugs.freeciv.org/Ticket/Display.html?id=13463 >

> +    if (!((name[i] <= 'z' && name[i] >= 'a')
> +          || (name[i] <= 'Z' && name[i] >= 'A')
> +          || (name[i] <= '9' && name[i] >= '0')
> +          || name[i] == '-'
> +          || name[i] == '_')) {
> +      return FALSE;

This assume ascii; while probably safe, we may want to use the
functions in ctype.h like isalnum.