[Rd] segfault on write.dcf with gzfile connection

[Prof Brian Ripley]

On Sun, 27 Nov 2005, Seth Falcon wrote:

> On 27 Nov 2005, ripley at stats.ox.ac.uk wrote:
>
>> Unfortunately va_copy is an ISO C99 function, so not always
>> available.
>>
>> Please do heed the posting guide and give us real details of your OS
>> and compiler, as they do matter here (stdarg.h is often
>> compiler-specific).
>
>    > R.version
>             _
>    platform x86_64-unknown-linux-gnu
>    arch     x86_64
>    os       linux-gnu
>    system   x86_64, linux-gnu
>    status   Under development (unstable)
>    major    2
>    minor    3.0
>    year     2005
>    month    11
>    day      23
>    svn rev  36434
>    language R
>
>    gcc --version
>    gcc (GCC) 3.3.4 (pre 3.3.5 20040809)

Thanks.  The only one of my systems that seems to have any problem is FC3 
x86_64 with gcc 3.4.3.  The fixes I have put in (different on R-patched 
and R-devel) fix this example and the one now in reg-tests-1-R on that 
machine at least.

> This page appears to have useful documentation:
> http://www.unixpapa.com/incnote/variadic.html

It's somewhat dated: (almost-)C99 compilers are much more common these 
days.

> Thinking out loud: Does writecon need to be variadic?  It is only
> called once with a fixed format string "%s%s".

It does not, but the print method for gzfile connections does.

-- 
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