Aligned Allocation

aa.nim

proc allocAligned(size, alignment: int): pointer =
  ## Allocates a block of memory whose address is aligned to `alignment`
  ## This is needed for the buffer accepted by ReadDirectoryChanges, which
  ## must be allocated on an int32 boundary.
  var address = alloc0(size)
  result = address
  while (cast[int](address) mod alignment) != 0:
    address = cast[pointer](cast[int](address)+1)

  # Move the memory to the correct address if needed, and then resize it.
  if address != result:
    moveMem(result, address, size + (alignment*2))
  result = address