[slang-users] Curious behaviour with SLsmg_set_color and SLsmg_write_string

[Remko van der Vossen]

On Wed, Nov 28, 2007 at 11:26:39AM -0500, John E. Davis wrote:
> On Wed, 28 Nov 2007 16:19:48 +0100, Remko van der Vossen <wich at stack.nl> said:
> >> slang version is 2.1.3
> >> xterminal is mlterm version 2.9.3
> >> LANG is set to ja_JP.UTF-8
> >> glibc version 2.4
> >
> >It seems to be a problem in combination with glibc, when I try the same
> >binary on a different system with the same versions of slang and mlterm
> >and the same LANG but glibc version 2.6.1 the problem does not occur.
> >
> >Now the question is if this is a bug purely in glibc or does slang do
> >something that doesn't agree with glibc 2.4. Does slang support glibc
> >2.4?
> 
> I have not heard of any slang-related issues with glibc 2.4. Did you
> compile slang for glibc 2.4?  Does the problem occur if you use xterm?
> Does a C version of you code show the same problems?  How do the
> smgtest and pager programs distributed in the slang/demo directory
> perform?

My observation about glibc seems incorrect, the testing environment was
not the same. I ran the original test in screen and the test on the
glibc 2.6.1 machine outside of a screen. Further testing seems to show
glibc 2.4 or 2.6.1 does not matter (much). I have not yet tried a C
versions of the code. An overview:

case	glibc	xterm	screen	app	
01	2.4	mlterm	yes	test	fails
02	2.4	mlterm	no	test	works
03	2.4	xterm	yes	test	works
04	2.4	xterm	no	test	works
05	2.4	uxterm	yes	test	works
06	2.6.1	mlterm	yes	test	fails, but better than case 01
07	2.6.1	mlterm	no	test	works
08	2.4	mlterm	yes	smgtest	act fails *1
09	2.4	mlterm	no	smgtest	act fails *1
10	2.4	uxterm	yes	smgtest	works
11	2.4	mlterm	yes	pager	works
12	2.4	mlterm	no	pager	works

screen is version 4.0.3 on both machines

*1 The "Another Color Test" fails, the first screen (black, white,
green, red in clockwise order) is incorrect (no white) the second, third
and forth screens in the cycle appear to be correct. (All other tests,
notably the wrapped string and monochrome tests, seem to work fine.)

btw, after the BCE color test the background does not switch back to
black which might impact some of the other tests, it might be wise to
reset it to blak after the test. For these tests it did not seem to
matter, I tried all tests with both a black and blue background with the
same results.

Judging from the tests with just my test program it would seem to be an
issue with mlterm and screen, but I have no such problems with
any n(w)curses based programs that are on the same system... I don't
know if I have any slang programs that could exhibit the same problems.

Let me know if you want me to test some specific other combinations, I
will strip the c++ from my test program and see if that yields the same
results and let you know about it.

Hopefully you can reproduce the problem with the above information.

Regards,

Remko van der Vossen
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