unifdef man page on 4.4BSD

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UNIFDEF(1)		  BSD General Commands Manual		    UNIFDEF(1)

     unifdef — remove ifdef'ed lines

     unifdef [-clt] [-Dsym -Usym -iDsym -iDsym] ... [file]

     Unifdef is useful for removing ifdef'ed lines from a file while otherwise
     leaving the file alone.  Unifdef acts on #ifdef, #ifndef, #else, and
     #endif lines, and it knows only enough about C to know when one of these
     is inactive because it is inside a comment, or a single or double quote.
     Parsing for quotes is very simplistic: when it finds an open quote, it
     ignores everything (except escaped quotes) until it finds a close quote,
     and it will not complain if it gets to the end of a line and finds no
     backslash for continuation.

     Available options:
     -Usym   Specify which symbols to define or undefine.  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 and ``#if'' control lines 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, the last occur‐
	     rence dominates.

     -c	     If the -c flag 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.

     -l	     Replace removed lines with blank lines instead of deleting them.
     -t	     Disables parsing for C comments and quotes, which is useful for
	     plain text.

     -iUsym  Ignore ifdefs.  If your C code uses 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 inside those
	     ifdefs.  One specifies ignored ifdefs with -iDsym and -iUsym sim‐
	     ilar to -Dsym and -Usym above.

     Unifdef copies its output to stdout and will take its input from stdin if
     no file argument is given.

     Unifdef works nicely with the -Dsym option added to diff(1) as of the 4.1
     Berkeley Software Distribution.


     Inappropriate else or endif.
     Premature EOF with line numbers of the unterminated #ifdefs.

     Exit status is 0 if output is exact copy of input, 1 if not, 2 if trou‐

     Should try to deal with ``#if'' lines.

     Doesn't work correctly if input contains null characters.

     The unifdef command appeared in 4.3BSD.

4.3 Berkeley Distribution	 April 1, 1994	     4.3 Berkeley Distribution

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