[tex-live] locale dependent writing to log/terminal is *broken*

[Thomas Esser]

> I mean that the bug was in TCX settings of is_printable vector, not in
> interpretting of it. Moreower, the bug was that the TCX setting of

The bug is not related to the is_printable vector at all. All output
to terminal and log is not done according to the is_printable vector,
but according to the isprint() function. 

isprint() is a standard library function of the locale subsystem, not
related to TeX's is_printable vector at all.

The is_printable vector is considered for \write to filedescriptors <= 16.
And, yes, if the tcx file has
  <input_code>  <tex_internal_code>
then the tcx code in web2c sets
  is_printable[<tex_internal_code>] := 1;

So, to sum it up:
  1) \writes to filedesc <= 16: printability check done against the
     is_printable vector. This has been ok (only problem: documentation
     is not explicit about this)

  2) \writes to filedesc > 16: have been checked with isprint(), but
     the argument of the check was not the character that would be output.
     This was wrong, and my fix has fixed this.

Thomas