R devel - Nov 2007 - (PR#10437) segfault on functions with 'source' attribute

I am not sure why you would want to do that, but the C code does assume 
source attributes were put there by R, and changing tests from !isNull to 
isString in a few places will fix that.

If there is a character vector "source" attribute it should be used:
that
is the point of such attributes.


On Mon, 19 Nov 2007, karl at huftis.org wrote:
> Full_Name: Karl Ove Hufthammer
> Version: 2.6.0
> OS: Linux (Fedora 7)
> Submission from: (NULL) (129.177.61.84)
>
>
> When viewing a function that has its 'source' attribute set to a
boolean or a
> numeric, R crashes with a segfault. (Setting 'source' to a
character vector does
> not make R crash, however.)
>
> Steps to reproduce:
>
>> attr(lm,"source")=FALSE
>> lm
>
> *** caught segfault ***
> address 0x18, cause 'memory not mapped'
>
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>
-- 
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

For the record: The reason I used attr(myfun, "source") = FALSE, is
that I
misread the example 'Tidying R Code' in 'Writing R Extensions',
which calls
for attr(myfun, "source") = NULL.

Somehow setting 'source' to FALSE seems more natural to me than 
setting it to NULL.

ripley at stats.ox.ac.uk:
> I am not sure why you would want to do that, but the C code does assume
> source attributes were put there by R, and changing tests from !isNull to
> isString in a few places will fix that.
-- 
Karl Ove Hufthammer