old_contents: 
  import mmap
  import string, os, re, sys
  
  PAGESIZE = mmap.PAGESIZE
  
  def test_both():
      "Test mmap module on Unix systems and Windows"
      
      # Create an mmap'ed file
      f = open('foo', 'w+')
      
      # Write 2 pages worth of data to the file
      f.write('\0'* PAGESIZE)
      f.write('foo')
      f.write('\0'* (PAGESIZE-3) )
  
      m = mmap.mmap(f.fileno(), 2 * PAGESIZE)
      f.close()
      
      # Simple sanity checks
      print '  Position of foo:', string.find(m, 'foo') / float(PAGESIZE), 'pages'
      assert string.find(m, 'foo') == PAGESIZE
      
      print '  Length of file:', len(m) / float(PAGESIZE), 'pages'
      assert len(m) == 2*PAGESIZE
  
      print '  Contents of byte 0:', repr(m[0])
      assert m[0] == '\0'
      print '  Contents of first 3 bytes:', repr(m[0:3])
      assert m[0:3] == '\0\0\0'
      
      # Modify the file's content
      print "\n  Modifying file's content..."
      m[0] = '3'
      m[PAGESIZE +3: PAGESIZE +3+3]='bar'
      
      # Check that the modification worked
      print '  Contents of byte 0:', repr(m[0])
      assert m[0] == '3'
      print '  Contents of first 3 bytes:', repr(m[0:3])
      assert m[0:3] == '3\0\0'
      print '  Contents of second page:',  m[PAGESIZE-1 : PAGESIZE + 7]
      assert m[PAGESIZE-1 : PAGESIZE + 7] == '\0foobar\0'
      
      m.flush()
  
      # Test doing a regular expression match in an mmap'ed file
      match=re.search('[A-Za-z]+', m)
      if match == None:
          print '  ERROR: regex match on mmap failed!'
      else:
          start, end = match.span(0)
          length = end - start               
  
          print '  Regex match on mmap (page start, length of match):',
          print start / float(PAGESIZE), length
          
          assert start == PAGESIZE
          assert end == PAGESIZE + 6
          
      print ' Test passed'
  
  test_both()
  
  
new_contents: 
  import mmap
  import string, os, re, sys
  
  PAGESIZE = mmap.PAGESIZE
  
  def test_both():
      "Test mmap module on Unix systems and Windows"
      
      # Create an mmap'ed file
      f = open('foo', 'w+')
      
      # Write 2 pages worth of data to the file
      f.write('\0'* PAGESIZE)
      f.write('foo')
      f.write('\0'* (PAGESIZE-3) )
  
      m = mmap.mmap(f.fileno(), 2 * PAGESIZE)
      f.close()
      
      # Simple sanity checks
      print '  Position of foo:', string.find(m, 'foo') / float(PAGESIZE), 'pages'
      assert string.find(m, 'foo') == PAGESIZE
      
      print '  Length of file:', len(m) / float(PAGESIZE), 'pages'
      assert len(m) == 2*PAGESIZE
  
      print '  Contents of byte 0:', repr(m[0])
      assert m[0] == '\0'
      print '  Contents of first 3 bytes:', repr(m[0:3])
      assert m[0:3] == '\0\0\0'
      
      # Modify the file's content
      print "\n  Modifying file's content..."
      m[0] = '3'
      m[PAGESIZE +3: PAGESIZE +3+3]='bar'
      
      # Check that the modification worked
      print '  Contents of byte 0:', repr(m[0])
      assert m[0] == '3'
      print '  Contents of first 3 bytes:', repr(m[0:3])
      assert m[0:3] == '3\0\0'
      print '  Contents of second page:',  m[PAGESIZE-1 : PAGESIZE + 7]
      assert m[PAGESIZE-1 : PAGESIZE + 7] == '\0foobar\0'
      
      m.flush()
  
      # Test doing a regular expression match in an mmap'ed file
      match=re.search('[A-Za-z]+', m)
      if match == None:
          print '  ERROR: regex match on mmap failed!'
      else:
          start, end = match.span(0)
          length = end - start               
  
          print '  Regex match on mmap (page start, length of match):',
          print start / float(PAGESIZE), length
          
          assert start == PAGESIZE
          assert end == PAGESIZE + 6
          
      m.close()
      os.unlink("foo")
      print ' Test passed'
  
  test_both()
  
  
subject: Mark Hammond: This patch fixes the mmap module on Windows 9x.