[lwip-devel] [bug #49827] wrong cast to size_t on 16-bit x86 architecture

[Simon Goldschmidt]

Follow-up Comment #8, bug #49827 (project lwip):

> I realize that DOS is dead, but not quite dead.

That's not a DOS issue, I'll have to check our M16C compiler; I bet it's the
same problem there. Although I don't think they have ptrdiff_t and this type
predefined, you're now forced to think about it yourself.

Using size_t for this was wrong, and maybe using ptrdiff_t is wrong, too. But
searching for a good default that works out of the box for most people,
there's not much left other than ptrdiff_t?

However, it seems a bit strange to me that ptrdiff_t is 16 bit when pointers
are 32 bit effectively. Probably they assume you don't mix pointers from
different segments as that wouldn't work anyway... At least it's a programming
model I didn't have in mind when writing on lwip code... (but in the end, why
do you want an IP stack for DOS, anyway :-)

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