bug#16448: 24.3; Messages from (error "...") with UTF-8 chars are printed wrongly in Emacs Lisp scripts

[Eli Zaretskii]

> Date: Wed, 15 Jan 2014 17:35:43 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 16448@debbugs.gnu.org, stselikh@gmail.com
> 
> > Date: Wed, 15 Jan 2014 08:02:49 +0400
> > From: Dmitry Antipov <dmantipov@yandex.ru>
> > Cc: 16448@debbugs.gnu.org
> > 
> > On 01/15/2014 04:10 AM, Sergey Tselikh wrote:
> > 
> > > In a script, when (error "...") instruction is executed with some UTF-8
> > > characters in its text, the message is not printed correctly.
> > 
> > In batch mode, (error ...) is handled by external-debugging-output, and the
> > latter just does:
> > 
> > putc (XINT (character) & 0xFF, stderr);
> >                         ^^^^^^
> > To allow multibyte sequences here, we should use something like:
> > 
> > === modified file 'src/print.c'
> > --- src/print.c     2014-01-01 07:43:34 +0000
> > +++ src/print.c     2014-01-15 03:55:39 +0000
> > @@ -709,8 +709,14 @@
> >   to make it write to the debugging output.  */)
> >     (Lisp_Object character)
> >   {
> > +  unsigned char str[MAX_MULTIBYTE_LENGTH];
> > +  unsigned int ch;
> > +  ptrdiff_t len;
> > +
> >     CHECK_NUMBER (character);
> > -  putc (XINT (character) & 0xFF, stderr);
> > +  ch = XINT (character);
> > +  len = CHAR_STRING (ch, str);
> > +  fwrite (str, len, 1, stderr);
> 
> This will only work correctly in a UTF-8 locale.  In the general case,
> we need to run the resulting multibyte sequence through ENCODE_SYSTEM,
> before writing it to stderr.

Done in trunk revision 116232.