[Rd] (PR#10437) segfault on functions with 'source' attribute

Prof Brian Ripley ripley at stats.ox.ac.uk
Wed Nov 21 16:18:31 CET 2007

On Tue, 20 Nov 2007, karl at huftis.org wrote:

> 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.

attr(myfun, "source") <- NULL does not 'set it to NULL', it removes the 

> 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.

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

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