> You could move PyBuffer_ToContiguous() from abstract.c to memoryview.c.

For 3.3 that would be ideal, yes. I asked a while ago on python-dev
whether to backport the memoryview rewrite. The general mood was
against it.

So, for 2.7/3.2 I could add all these functions to abstract.c.
But an additional problem is that the whole test infrastructure of
Lib/test/test_buffer.py and Modules/_testbuffer.c would be missing.