Comment by vardump

Perhaps because the memory buffers might be of different size.

Maybe memcpy_oobp (out of bounds protection) signature could be:

  memcpy_oobp(void* dst, size_t dst_size, void* src, size_t src_size);

Then again, I guess you could just as well do:

  memcpy(dst, src, min(dst_size, src_size));

But having to explicitly specify both destination and source sizes might have prevented a lot of buffer overwrite bugs.