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.\" Copyright (c) 1985, 1991 The Regents of the University of California.
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.\" This code is derived from software contributed to Berkeley by
.\" Dave Yost.
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.\"     @(#)unifdef.1	6.5 (Berkeley) 4/23/91
.\"
.Dd April 23, 1991
.Dt UNIFDEF 1
.Os BSD 4.3
.Sh NAME
.Nm unifdef
.Nd remove ifdef'ed lines
.Sh SYNOPSIS
.Nm unifdef
.Oo
.Fl t l c
.Fl D Ns Ar sym
.Fl U Ns Ar sym
.Fl iD Ns Ar sym
.Fl iD Ns Ar sym
.Oc
.Ar ...
.Op Ar file
.Sh DESCRIPTION
.Nm Unifdef
is useful for removing ifdef'ed lines
from a file while otherwise leaving the file alone.
.Nm 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.
.Pp
Available options:
.Bl -tag -width Ds -compact
.It Fl D Ns Ar sym
.It Fl U Ns Ar sym
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
.Ar 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 occurrence dominates.
.Pp
.It Fl c
If the
.Fl c
flag is specified,
then the operation of
.Nm unifdef
is complemented,
i.e. the lines that would have been removed or blanked
are retained and vice versa.
.Pp
.It Fl l
Replace removed lines with blank lines
instead of deleting them.
.It Fl t
Disables parsing for
C comments and quotes useful for plain text
(not C code).
.Pp
.It Fl iD Ns Ar sym
.It Fl iU Ns Ar sym
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
.Nm 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
.Fl iD Ns Ar sym
and
.Fl iU Ns Ar sym
similar to
.Fl D Ns Ar sym
and
.Fl U Ns Ar sym
above.
.El
.Pp
.Nm Unifdef
copies its output to
.Em stdout
and will take its input from
.Em stdin
if no
.Ar file
argument is given.
.Pp
.Nm Unifdef
works nicely with the
.Fl D Ns Ar sym
option added to
.Xr diff 1
as of the 4.1 Berkeley Software Distribution.
.Sh SEE ALSO
.Xr diff 1
.Sh DIAGNOSTICS
Inappropriate else or endif.
.br
Premature
.Tn EOF
with line numbers of the unterminated #ifdefs.
.Pp
Exit status is 0 if output is exact copy of input, 1 if not, 2 if trouble.
.Sh BUGS
Should try to deal with ``#if'' lines.
.Pp
Doesn't work correctly if input contains null characters.
.Sh HISTORY
The
.Nm
command appeared in
.Bx 4.3 .