166 lines
4.7 KiB
Groff
166 lines
4.7 KiB
Groff
.\" Copyright (c) 1985, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Dave Yost.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)unifdef.1 8.2 (Berkeley) 4/1/94
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.\"
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.Dd April 1, 1994
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.Dt UNIFDEF 1
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.Os BSD 4.3
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.Sh NAME
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.Nm unifdef
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.Nd remove ifdef'ed lines
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.Sh SYNOPSIS
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.Nm unifdef
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.Op Fl clt
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.Oo
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.Fl D Ns Ar sym
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.Fl U Ns Ar sym
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.Fl iD Ns Ar sym
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.Fl iD Ns Ar sym
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.Oc
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.Ar ...
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.Op Ar file
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.Sh DESCRIPTION
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.Nm Unifdef
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is useful for removing ifdef'ed lines
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from a file while otherwise leaving the file alone.
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.Nm Unifdef
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acts on
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#ifdef, #ifndef, #else, and #endif lines,
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and it knows only enough about C
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to know when one of these is inactive
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because it is inside
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a comment,
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or a single or double quote.
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Parsing for quotes is very simplistic:
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when it finds an open quote,
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it ignores everything (except escaped quotes)
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until it finds a close quote, and
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it will not complain if it gets
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to the end of a line and finds no backslash for continuation.
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.Pp
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Available options:
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.Bl -tag -width Ds -compact
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.It Fl D Ns Ar sym
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.It Fl U Ns Ar sym
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Specify which symbols to define or undefine.
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and the lines inside those ifdefs will be copied to the output or removed as
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appropriate.
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The ifdef, ifndef, else, and endif lines associated with
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.Ar sym
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will also be removed.
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Ifdefs involving symbols you don't specify
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and ``#if'' control lines
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are untouched and copied out
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along with their associated
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ifdef, else, and endif lines.
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If an ifdef X occurs nested inside another ifdef X, then the
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inside ifdef is treated as if it were an unrecognized symbol.
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If the same symbol appears in more than one argument,
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the last occurrence dominates.
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.Pp
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.It Fl c
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If the
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.Fl c
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flag is specified,
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then the operation of
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.Nm
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is complemented,
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i.e. the lines that would have been removed or blanked
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are retained and vice versa.
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.Pp
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.It Fl l
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Replace removed lines with blank lines
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instead of deleting them.
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.It Fl t
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Disables parsing for C comments and quotes, which is useful
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for plain text.
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.Pp
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.It Fl iD Ns Ar sym
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.It Fl iU Ns Ar sym
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Ignore ifdefs.
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If your C code uses ifdefs to delimit non-C lines,
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such as comments
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or code which is under construction,
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then you must tell
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.Nm
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which symbols are used for that purpose so that it won't try to parse
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for quotes and comments
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inside those ifdefs.
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One specifies ignored ifdefs with
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.Fl iD Ns Ar sym
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and
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.Fl iU Ns Ar sym
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similar to
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.Fl D Ns Ar sym
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and
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.Fl U Ns Ar sym
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above.
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.El
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.Pp
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.Nm Unifdef
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copies its output to
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.Em stdout
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and will take its input from
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.Em stdin
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if no
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.Ar file
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argument is given.
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.Pp
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.Nm Unifdef
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works nicely with the
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.Fl D Ns Ar sym
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option added to
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.Xr diff 1
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as of the 4.1 Berkeley Software Distribution.
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.Sh SEE ALSO
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.Xr diff 1
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.Sh DIAGNOSTICS
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Inappropriate else or endif.
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.br
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Premature
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.Tn EOF
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with line numbers of the unterminated #ifdefs.
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.Pp
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Exit status is 0 if output is exact copy of input, 1 if not, 2 if trouble.
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.Sh BUGS
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Should try to deal with ``#if'' lines.
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.Pp
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Doesn't work correctly if input contains null characters.
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.3 .
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