unifdef(1)              (BSD Compatibility Package)              unifdef(1)

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, com-
     ments, single and double quotes of C syntax, but it does not do any
     including or interpretation of macros. Neither does it strip out com-
     ments, though it recognizes and ignores them. You specify which sym-
     bols you want defined with -D options, and which you want undefined
     with -U options. Lines within those ifdefs will be copied to the out-
     put, 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 associated 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.

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

     -l        Replace lines removed with blank lines.

     -t        Plain text option. unifdef refrains from attempting 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 Compatibility Package)              unifdef(1)

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.

SEE ALSO
     cc(1), diff(1).













































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