patch applied (packages/base): Tweak the BufferedIO class to enable a memory-mapped file implementation

[Simon Marlow]

Wed Aug  5 06:40:36 PDT 2009  Simon Marlow <marlowsd at gmail.com>
  * Tweak the BufferedIO class to enable a memory-mapped file implementation
  Ignore-this: ec67d7a0a6d977438deaa342503f77e0
  We have to eliminate the assumption that an empty write buffer can be
  constructed by setting the buffer pointers to zero: this isn't
  necessarily the case when the buffer corresponds to a memory-mapped
  file, or other in-memory device implementation.

    M ./GHC/IO/Buffer.hs -17 +17
    M ./GHC/IO/BufferedIO.hs -7 +20
    M ./GHC/IO/FD.hs -1 +1
    M ./GHC/IO/Handle/Internals.hs -3 +4
    M ./GHC/IO/Handle/Text.hs -2 +2

View patch online:
http://darcs.haskell.org/packages/base/_darcs/patches/20090805134036-12142-0e195676db32a675884b3c195fe62218d5e0f152.gz