   100
   101
   102
   103   x
   104  shift
   105  esc9
   106  esc8
   107  esc
   108  esc6
   109  backspace
   110  tab     tab
   111  abc  efg
   112  |---|
   113  | x |
   114  |   |
   115  line longer than 132 characters line longer than 132 characters line longer than 132 characters line longer than 132 ch01234
   116  nulls
   117  next line ascii 0 - 127
   118
   119
   200
   201  abc
   202   abc
   203  a bc
   204  ab c
   205  abc
   206    abc
   207  a  bc
   208  ab  c
   209  abc
   210   a bc
   211   ab c
   212  a b c
   213  a  bc
   214  a bc
   215  abc
   216   abc
   217   a b c
   218   a  bc
   219  a  bc
   220   abc
   221     abc
   222  abc
return value: 0