[Rd] text() with invalid argument type crashes RGui.exe

[Prof Brian Ripley]

It's general (on all platforms), and the internal code for text.default 
needs a safety check.


On Wed, 24 Nov 2004, P Ehlers wrote:

> Dear Rexperts:
>
> (R 2.0.1 on Windows XP Pro)
>
> Is the following problem unique to my setup?
> If it's a known problem, I didn't see it at
> http://bugs.r-project.org/ nor find discussion in the archives.
>
> plot(1:10)
> loc <- c(5, 6)
> text(loc, labels = "a")
>
> Produces expected results according to ?xy.coords.
>
> plot(1:10)
> loc <- list(x = 5, y = 6)
> text(loc, labels = "a")
>
> No problem.
>
> But:
>
> plot(1:10)
> loc <- list(5, 6)
> text(loc, labels = "a")
>
> crashes RGui.
> ("R for Windows GUI front-end has encountered a problem and ...")
>
> R-FAQ:9.1 says:
>
> If you call .C(), .Fortran(), .External() or .Call() (or
> .Internal()) yourself (or in a function you wrote), you can
> always crash R by using wrong argument types (modes). This
> is not a bug.
>
> I realize that I'm using the wrong argument type;
> nevertheless, if the behaviour is general, it might be better
> to generate an error.
>
> For anyone with more know-how than I have, here are the details
> of the crash:
> AppName: rgui.exe     AppVer: 2.1.41115.0     ModName: r.dll
> ModVer: 2.1.41115.0     Offset: 000ef1b3
>
>
> Peter Ehlers
> U of Calgary
> ehlers at math.ucalgary.ca
>
> ______________________________________________
> R-devel at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
>

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595