UNIFDEF(1)          RISC/os Reference Manual           UNIFDEF(1)



NAME
     unifdef - remove ifdef'ed lines

SYNOPSIS
     unifdef [ -t -l -c -Dsym -Usym -idsym -iusym ] ...  [ file ]

DESCRIPTION
     Unifdef is useful for removing ifdef'ed lines from a file
     while otherwise leaving the file alone.  Unifdef is like a
     stripped-down C preprocessor:  it is smart enough to deal
     with the nested ifdefs, comments, single and double quotes
     of C syntax so that it can do its job, but it doesn't do any
     including or interpretation of macros.  Neither does it
     strip out comments, though it recognizes and ignores them.
     You specify which symbols you want defined -Dsym or unde-
     fined -Usym and the lines inside those ifdefs will be copied
     to the output or removed as appropriate.  The ifdef, ifndef,
     else, and endif lines associated with sym will also be
     removed.  Ifdefs involving symbols you don't specify are
     untouched and copied out along with their associated ifdef,
     else, and endif lines.  If an ifdef X occurs nested inside
     another ifdef X, then the inside ifdef is treated as if it
     were an unrecognized symbol.  If the same symbol appears in
     more than one argument, only the first occurrence is signi-
     ficant.

     The -l option causes unifdef to replace removed lines with
     blank lines instead of deleting them.

     If you use ifdefs to delimit non-C lines, such as comments
     or code which is under construction, then you must tell
     unifdef which symbols are used for that purpose so that it
     won't try to parse for quotes and comments in those ifdef'ed
     lines.  You specify that you want the lines inside certain
     ifdefs to be ignored but copied out with -idsym and -iusym
     similar to -Dsym and -Usym above.

     If you want to use unifdef for plain text (not C code), use
     the -t option.  This makes unifdef refrain from attempting
     to recognize comments and single and double quotes.

     Unifdef copies its output to stdout and will take its input
     from stdin if no file argument is given.  If the -c argument
     is specified, then the operation of unifdef is complemented,
     i.e. the lines that would have been removed or blanked are
     retained and vice versa.

SEE ALSO
     diff(1)

DIAGNOSTICS
     Premature EOF, inappropriate else or endif.



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UNIFDEF(1)          RISC/os Reference Manual           UNIFDEF(1)



     Exit status is 0 if output is exact copy of input, 1 if not,
     2 if trouble.

BUGS
     Does not know how to deal with cpp consructs such as

          #if  defined(X) || defined(Y)


AUTHOR
     Dave Yost

ORIGIN
     4.3 BSD









































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