unifdef(1-BSD)    MISC. REFERENCE MANUAL PAGES     unifdef(1-BSD)



NAME
     unifdef - resolve and remove ifdef'ed lines from  C  program
     source

SYNOPSIS
     /usr/ucb/unifdef [ -clt ] [ -Dname ] [ -Uname ] [ -iDname ]
     [ -iUname ] ... [ filename ]

DESCRIPTION
     unifdef removes ifdefed lines from a  file  while  otherwise
     leaving the file alone.  It is smart enough to deal with the
     nested ifdefs, comments, single and double quotes of C  syn-
     tax,  but  it does not 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 with -D options, and which you  want  undefined
     with  -U  options.  Lines within those ifdefs will be copied
     to the output,  or  removed,  as  appropriate.   Any  ifdef,
     ifndef,  else, and endif lines associated with filename will
     also be  removed.   ifdefs  involving  symbols  you  do  not
     specify  are untouched and copied out along with their asso-
     ciated ifdef, else, and endif lines.  If  an  ifdefX  occurs
     nested  inside  another  ifdefX,  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 significant.  unifdef copies its output to the
     standard  output  and  will take its input from the standard
     input if no  filename  argument  is  given.   The  following
     options are available:

     -c        Complement the normal operation.  Lines that would
               have  been  removed  or  blanked are retained, and
               vice versa.

     -l        Replace ``lines removed'' lines with blank lines.

     -t        Plain text option.  unifdef refrains from attempt-
               ing  to  recognize  comments and single and double
               quotes.

     -iDname   Ignore, but print out, lines associated  with  the
               defined symbol name.  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
               will  not  try  to  parse  for quotes and comments
               within them.

     -iUname   Ignore, but print out, lines associated  with  the
               undefined symbol name.





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unifdef(1-BSD)    MISC. REFERENCE MANUAL PAGES     unifdef(1-BSD)



SEE ALSO
     cc(1) cc(1) in the Programmer's Reference Manual.
     diff(1) in the User's Reference Manual.

DIAGNOSTICS
     Premature EOF       Inappropriate  else  or   endif.    Exit
                         status  is  0 if output is exact copy of
                         input, 1 if not, 2 if unifdef encounters
                         problems.














































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