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

[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.

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/
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