.\" Copyright (c) 1985 Regents of the University of California.
.\" All rights reserved. The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\" @(#)unifdef.1 6.1 (Berkeley) %G%
unifdef \- remove ifdef'ed lines
is useful for removing ifdef'ed lines from a file while otherwise leaving the
is like a stripped-down C preprocessor:
it is smart enough to deal with the nested ifdefs, comments,
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
and the lines inside those ifdefs will be copied to the output or removed as
The ifdef, ifndef, else, and endif lines associated with
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 significant.
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,
which symbols are used for that purpose so that it won't try to parse
You specify that you want the lines inside certain ifdefs to be ignored
for plain text (not C code), use the
refrain from attempting to recognize comments and single and double quotes.
and will take its input from
argument is specified, then the operation of
i.e. the lines that would have been removed or blanked
are retained and vice versa.
Premature EOF, inappropriate else or endif.
Exit status is 0 if output is exact copy of input, 1 if not, 2 if trouble.
Does not know how to deal with \fIcpp\fP consructs such as
#if defined(X) || defined(Y)