OpenEuphoria

2. Re: bug in position()

• Posted by Robert Craig <rds at RapidEuphoria.com> Sep 25, 2005
• 445 views

jacques deschênes wrote:
> As windows consoles may have more than 25 lines, there is a bug with the
> actual implementation
> of position().
> If line is greater than 25 euphoria crash. (tested on windows xp pro)
> 
> exemple:
> }}}
<eucode>
> include graphics.e
> sequence pos
> pos = get_position()
> position(pos[1],pos[2]-1) -- crash if pos[1]>25
> </eucode>
{{{


Ok, thanks Jacques.
I duplicated the problem on my machine.
I'll fix it for the next release.
A couple of other people have reported similar 
problems with consoles over 25 lines. It's not just 2.5, 
but earlier releases too.

Regards,
   Rob Craig
   Rapid Deployment Software
   http://www.RapidEuphoria.com

4. Re: bug in position()

• Posted by Chris Burch <chriscrylex at aol.com> Sep 25, 2005
• 443 views

jacques deschênes wrote:
> 
> 
> Hi Robert,
> As windows consoles may have more than 25 lines, there is a bug with the
> actual implementation
> of position().
> If line is greater than 25 euphoria crash. (tested on windows xp pro)
> 
> exemple:
> }}}
<eucode>
> include graphics.e
> sequence pos
> pos = get_position()
> position(pos[1],pos[2]-1) -- crash if pos[1]>25
> </eucode>
{{{

> 
> regards,
> Jacques Deschênes
> 
> p.s. Folks forget about my previous message, I read message sequentially and
> don't
> check other's 
> reply before replying.
> 

Hi

I've never thought of this a bug, just a feature of the language. Some screens
have lines > 25, and if you have set the screen to one of these modes, then you
can write to > 25. SCREEN_LINES tells you how long the screen is

SCREEN_LINES = vid_conf[VC_LINES]
SCREEN_COLS = vid_conf[VC_COLUMNS]


then just wrap position with a check for the length of the screen to prevent
crashes.

Please, any changes should not affect the abilty to write beyond 25 lines

Chris

http://members.aol.com/chriscrylex/euphoria.htm
http://uboard.proboards32.com/
http://members.aol.com/chriscrylex/EUSQLite/eusql.html

6. Re: bug in position()

• Posted by jacques deschênes <desja at globetrotter.net> Sep 25, 2005
• 455 views

The bug that get_position() return the right line number event if its greater
than 25 so position() should not crash when passing it parameters obtained from
get_position() as shown in my exemple.

jacques


Chris Burch wrote:
> 
> jacques deschênes wrote:
> > 
> > 
> > Hi Robert,
> > As windows consoles may have more than 25 lines, there is a bug with the
> > actual implementation
> > of position().
> > If line is greater than 25 euphoria crash. (tested on windows xp pro)
> > 
> > exemple:
> > }}}
<eucode>
> > include graphics.e
> > sequence pos
> > pos = get_position()
> > position(pos[1],pos[2]-1) -- crash if pos[1]>25
> > </eucode>
{{{

> > 
> > regards,
> > Jacques Deschênes
> > 
> > p.s. Folks forget about my previous message, I read message sequentially and
> > don't
> > check other's 
> > reply before replying.
> > 
> 
> Hi
> 
> I've never thought of this a bug, just a feature of the language. Some screens
> have lines
> > 25, and if you have set the screen to one of these modes, then you can write
> > to >
> 25. SCREEN_LINES tells you how long the screen is
> 
> SCREEN_LINES = vid_conf[VC_LINES]
> SCREEN_COLS = vid_conf[VC_COLUMNS]
> 
> 
> then just wrap position with a check for the length of the screen to prevent
> crashes.
> 
> Please, any changes should not affect the abilty to write beyond 25 lines
> 
> Chris
> 
> <a
> href="http://members.aol.com/chriscrylex/euphoria.htm">http://members.aol.com/chriscrylex/euphoria.htm</a>
> <a href="http://uboard.proboards32.com/">http://uboard.proboards32.com/</a>
> <a
> href="http://members.aol.com/chriscrylex/EUSQLite/eusql.html">http://members.aol.com/chriscrylex/EUSQLite/eusql.html</a>
>

8. Re: bug in position()

• Posted by "Juergen Luethje" <j.lue at gmx.de> Sep 27, 2005
• 450 views

Robert Craig wrote:

> Robert Craig wrote:
>
>> jacques desch=EAnes wrote:
>>
>>> As windows consoles may have more than 25 lines, there is a bug with
>>> the actual implementation of position().
>>> If line is greater than 25 euphoria crash. (tested on windows xp pro)
>>>
>>> exemple:
>>> }}}
<eucode>
>>> include graphics.e
>>> sequence pos
>>> pos = get_position()
>>> position(pos[1],pos[2]-1) -- crash if pos[1]>25
>>> </eucode>
{{{

>>
>> Ok, thanks Jacques.
>> I duplicated the problem on my machine.
>> I'll fix it for the next release.
>> A couple of other people have reported similar
>> problems with consoles over 25 lines. It's not just 2.5,
>> but earlier releases too.

Just for the sake of completeness:
The problem does *not* exist on my Windows 98 machine.
Someone else reported to me the same problem under Win 2000 SP4.
I could duplicate it under Windows XP, using a console window with
25(!) lines, so not only consoles with over 25 lines are affected.

I used something like

pos = get_position()
position(pos[1], 1)

I don't have a Windows XP machine here right now, and unfortunately I
forgot to write down the error message, but as far as I recall it was
something like "Can't move cursor to line 27" or so.
So it seems to be a bug in get_position() rather than position().
pos[1] is provided by get_position(), which should always be an existing
line, shouldn't it?

> As a quick fix, try calling text_rows()
> in graphics.e. That seems to tell Euphoria about the larger number
> of lines, and stop it from giving a false error report. e.g.
>
> }}}
<eucode>
> include graphics.e
> sequence pos
>
> if text_rows(43) then
> end if
> pos = get_position()
> position(pos[1],pos[2]-1) -- crash if pos[1]>25
> </eucode>
{{{


That worked for me, too. Thanks!

> The ed editor does that, and it handles
> console windows with a large number of lines.

Regards,
   Juergen

--
Have you read a good program lately?

10. Re: bug in position()

• Posted by Robert Craig <rds at RapidEuphoria.com> Sep 27, 2005
• 442 views

Juergen Luethje wrote:
> 
> Robert Craig wrote:
> 
> > Robert Craig wrote:
> >
> >> jacques desch=EAnes wrote:
> >>
> >>> As windows consoles may have more than 25 lines, there is a bug with
> >>> the actual implementation of position().
> >>> If line is greater than 25 euphoria crash. (tested on windows xp pro)
> >>>
> >>> exemple:
> >>> }}}
<eucode>
> >>> include graphics.e
> >>> sequence pos
> >>> pos = get_position()
> >>> position(pos[1],pos[2]-1) -- crash if pos[1]>25
> >>> </eucode>
{{{

> >>
> >> Ok, thanks Jacques.
> >> I duplicated the problem on my machine.
> >> I'll fix it for the next release.
> >> A couple of other people have reported similar
> >> problems with consoles over 25 lines. It's not just 2.5,
> >> but earlier releases too.
> 
> Just for the sake of completeness:
> The problem does *not* exist on my Windows 98 machine.
> Someone else reported to me the same problem under Win 2000 SP4.
> I could duplicate it under Windows XP, using a console window with
> 25(!) lines, so not only consoles with over 25 lines are affected.
> 
> I used something like
> }}}
<eucode>
> pos = get_position()
> position(pos[1], 1)
> </eucode>
{{{

> 
> I don't have a Windows XP machine here right now, and unfortunately I
> forgot to write down the error message, but as far as I recall it was
> something like "Can't move cursor to line 27" or so.
> So it seems to be a bug in get_position() rather than position().
> pos[1] is provided by get_position(), which should always be an existing
> line, shouldn't it?
> 
> > As a quick fix, try calling text_rows()
> > in graphics.e. That seems to tell Euphoria about the larger number
> > of lines, and stop it from giving a false error report. e.g.
> >
> > }}}
<eucode>
> > include graphics.e
> > sequence pos
> >
> > if text_rows(43) then
> > end if
> > pos = get_position()
> > position(pos[1],pos[2]-1) -- crash if pos[1]>25
> > </eucode>
{{{

> 
> That worked for me, too. Thanks!
> 
> > The ed editor does that, and it handles
> > console windows with a large number of lines.

Thanks. I'll keep all this information in mind 
when I debug it.

Regards,
   Rob Craig
   Rapid Deployment Software
   http://www.RapidEuphoria.com