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       disp - TDF pretty printer


       disp [ options ] input-file [ output-file ]


       disp translates the input TDF capsule, input-file into a human-readable
       form, the layout of which reflects the structure of the underlying  TDF
       tree.  If the output-file argument is present, this is used for output;
       otherwise the standard output is used.

       Whenever possible the output of disp  matches  the  TDF  specification.
       The most important exception is the use of asterisks after a token name
       to indicate an application of that token.   Also  a  dash  is  used  to
       indicate  the  absense of an optional argument and an ellipsis (...) is
       used to indicate that a token’s arguments have been skipped rather than
       decoded (since the token was undeclared).

       It  is  recommended  that disp is invoked via tcc(1) using the -disp or
       the -disp_t option.  The -opt flag can be passed to disp by passing the
       flag -Wd,-opt to tcc.


       -g     Makes disp print any diagnostic information units within the TDF

              Makes disp try to format its output to fit into a page width  of
              columns.  The default page width is 80.

       -q     Makes  disp ignore the specified page width and print its output
              with the  minimum  possible  indentation.   This  makes  it  run
              faster,  but  does  not  make the best use of the available page

       -r     Makes disp continue after any errors.  The use of this  flag  is
              not  recommended since anything read after an error is likely to
              be of very little value.

       -v     Makes disp print its version number and the version of  the  TDF
              specification it supports.

       -A     Makes  disp  decode  all  the  units  it  recognises  (including
              diagnostic and linking units) within the TDF capsule.

       -D     Makes disp print a simple binary dump of the input  file.   This
              is intended for debugging purposes.

       -E     Makes  disp  report  such  information as the number of external
              tags and tokens which it usually omits.

       -S     Because tokens may be defined in terms of other  tokens  and  do
              not  need to be declared before they are defined, disp makes two
              passes of all the token definition units.  In the first pass  it
              extracts  only  the  declaration  information, stepping over the
              main body of  the  definition.   On  the  second  pass  all  the
              information  is  read.   The -S option makes disp skip the first

       -T     The skip pass described  under  the  -S  option  is  usual  done
              silently,  without printing any information.  This is changed by
              the -T option.

       -U     Makes disp print  the  usage  information  associated  with  the
              external  tokens and tags and also any linkage information units
              within the capsule.

       -V     By default disp attempts to rationalise the TDF  it  reads.   In
              particular  it  uses  the  external token and tag names whenever
              possible, following the token and tag bindings  to  find  these,
              and  makes  up names for those tokens and tags which do not have
              external names.  The -V option makes it  not  attempt  any  such
              rationalisation, but instead to output exactly what it reads.

       -W     Makes  disp  issue  a  warning  about  every token which is used
              before it is declared.


       The error reports if the input file is not  a  legal  TDF  capsule  are
       intended  to  aid  developers writing programs which produce TDF.  Thus
       they try to give all the information that may  be  required,  including
       the position within the input file that the error occurred.