>alloc: 0
>write: 80 'abcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyz12'
>write: 80 'abcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyz12'
>write: 4 '9876'
>dump
 Size: 164/0
  blk 080 from 000 'abcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyz12'
                    ^--readp
  blk 080 from 000 'abcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyz12'
                    ^--readp
  stg 4 '9876'
>read: 75 'abcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvw'
>dump
 Size: 89/0
  blk 080 from 075 'abcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyz12'
                                                                                               ^--readp
  blk 080 from 000 'abcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyz12'
                    ^--readp
  stg 4 '9876'
>read: 7 'xyz12ab'
>dump
 Size: 82/0
  blk 080 from 002 'abcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyz12'
                      ^--readp
  stg 4 '9876'
>read: 75 'cdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxy'
>dump
 Size: 7/0
  blk 080 from 077 'abcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyzabcdefghijklmnopqrtsuvwxyz12'
                                                                                                 ^--readp
  stg 4 '9876'
>read: 7 'z129876'
>dump
 Size: 0/0
  stg 0 ''
