Re: Interesting things found in ncurses that affect screen

[Thomas Dickey]

On Mon, 18 Jul 2005, Michael Schroeder wrote:


On Sun, Jul 17, 2005 at 09:19:38PM +0200, Nikolai Weibull wrote:

...

Don't ask me, I'm not aware of any problems screen has with UTF-8.
Maybe Thomas Dickey, the ncurses author, can shed some light on
this.


The code's doing what it is intended: when screen is running in UTF-8 
mode, it ignores the termcap information, only accepts the UTF-8 encoding 
for line-drawing characters.  Normally the $TERM value gives the required 
information.  That function helps check for known cases where it does not.


--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net


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Re: Interesting things found in ncurses that affect screen

[Nikolai Weibull]

Juergen Weigert wrote:

 On Jul 17, 05 21:19:38 +0200, Nikolai Weibull wrote:

  ncurses-5.4/ncurses/tinfo/lib_setup.c:
  
  /*
   * Check for known broken cases where a UTF-8 locale breaks the alternate
   * character set.
   */
  NCURSES_EXPORT(int)
  _nc_locale_breaks_acs(void)
  {   
  char *env = getenv(TERM);
  if (env != 0) {
  if (strstr(env, linux))
  return 1;   /* always broken */
  if (strstr(env, screen) != 0
   ((env = getenv(TERMCAP)) != 0
   strstr(env, screen) != 0)
   strstr(env, hhII00) != 0) {
  return 1;
 }
 }
  return 0;
  }
 
  So, what's the deal?  

 That is odd.
 We should ask upstream ncurses when and why this code appeared.
 Upstream is still Thomas Dickey, right?

From the 5.4 changelog on
http://www.gnu.org/software/ncurses/ncurses.html (why I didn't think to
check it before posting is beyond me):

Major bug fixes:

* implement a workaround so that line-drawing works with screen's crippled
UTF-8 support (tested with 3.9.13). This only works with the
wide-character support (--enable-widec); the normal library will simply
suppress line-drawing when running in a UTF-8 locale in screen

I have compiled ncurses with widec support and am running screen 4.0.2.
LANG is set to en_US.UTF-8,
nikolai

-- 
Nikolai Weibull: now available free of charge at http://bitwi.se/!
Born in Chicago, IL USA; currently residing in Gothenburg, Sweden.
main(){printf(linux[\021%six\012\0],(linux)[have]+fun-97);}


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Re: Interesting things found in ncurses that affect screen

[Michael Schroeder]

On Mon, Jul 18, 2005 at 07:37:58AM -0400, Thomas Dickey wrote:
 On Mon, 18 Jul 2005, Michael Schroeder wrote:
 
 On Mon, Jul 18, 2005 at 06:25:24AM -0400, Thomas Dickey wrote:
 The code's doing what it is intended: when screen is running in UTF-8
 mode, it ignores the termcap information, only accepts the UTF-8 encoding
 for line-drawing characters.
 
 No, that's not right. There once was a version of screen that
 ignored termcap information, but this got changed a long time ago...
 
 That's hard for me to see, since I haven't seen a recent changelog for
 screen, so determining what it does means I get to read through the code.

*grin*. That one counted as bugfix, so there is no entry in the
changelog (aka patchlevel.h).

Cheers,
  Michael.

-- 
Michael Schroeder   [EMAIL PROTECTED]
main(_){while(_=~getchar())putchar(~_-1/(~(_|32)/13*2-11)*13);}


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