[Rd] longint

[Brian Ripley]

> On 15 Aug 2018, at 12:48, Duncan Murdoch <murdoch.duncan using gmail.com> wrote:
> 
>> On 15/08/2018 7:08 AM, Benjamin Tyner wrote:
>> Hi
>> In my R package, imagine I have a C function defined:
>>     void myfunc(int *x) {
>>        // some code
>>     }
>> but when I call it, I pass it a pointer to a longint instead of a
>> pointer to an int. Could this practice potentially result in a segfault?
> 
> I don't think the passing would cause a segfault, but "some code" might be expecting a positive number, and due to the type error you could pass in a positive longint and have it interpreted as a negative int.

Are you thinking only of a little-endian system?  A 32-bit lookup of a pointer to a 64-bit area could read the wrong half and get a completely different value.

> 
> Duncan Murdoch
> 
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