[M3devel] packing problem… how exactly does modula-3 pack data into records??

Dragiša Durić dragisha at m3w.org
Thu Jan 19 18:47:39 CET 2012

Why wouldn't it be portable? What endiannes has to do with bit strings?

I don't think it is wrong to make it left-to-right-until-spent… As it's implementation dependent… ok… Why would not our implementation be left-to-….? :)

I think it's totally reasonable to expect from implementation exactly what I am expecting here and now.

As for C… I know several ways to implement this… And good ones. What I would like is to have cm3 doing it in obvious, intuitive way.


On Jan 19, 2012, at 5:28 AM, Jay K wrote:

>  > packing data into record about packing bits left-right-until-spent?
> It is not portable.
> In particular, there is endianness variation.
> The C spec leaves things up to implementation.
> If you can, I recommend copying the data from C to a more portable less dense Modula-3 representation.
> Like what is now done throughout m3core/libm3 -- i.e. we don't interface with C at all through bitfields, nor do we try to line up with struct stat or any other struct, roughly speaking.
> (Maybe still a few, like struct linger).

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