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-.\"	$NetBSD: unifdef.1,v 1.13 2017/07/03 21:34:22 wiz Exp $
-.\"
-.\" Copyright (c) 1985, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" Dave Yost.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" Portions of this code (support for #if and #elif) are Copyright (c)
-.\" 2002, 2003 Tony Finch.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)unifdef.1	8.2 (Berkeley) 4/1/94
-.\"	$dotat: things/unifdef.1,v 1.45 2003/01/20 14:37:08 fanf2 Exp $
-.\" $FreeBSD: src/usr.bin/unifdef/unifdef.1,v 1.19 2003/01/20 12:41:41 fanf Exp $
-.\"
-.Dd June 5, 2009
-.Dt UNIFDEF 1
-.Os
-.Sh NAME
-.Nm unifdef ,
-.Nm unifdefall
-.Nd remove preprocessor conditionals from code
-.Sh SYNOPSIS
-.Nm
-.Op Fl ceklst
-.Op Fl I Ns Ar path
-.Op Fl D Ns Ar sym Ns Op = Ns Ar val
-.Op Fl U Ns Ar sym
-.Op Fl iD Ns Ar sym Ns Op = Ns Ar val
-.Op Fl iU Ns Ar sym
-.Ar ...
-.Op Fl o Ar output
-.Op Ar file
-.Nm unifdefall
-.Op Fl I Ns Ar path
-.Ar ...
-.Ar file
-.Sh DESCRIPTION
-The
-.Nm
-utility selectively processes conditional
-.Xr cpp 1
-directives.
-It removes from a file both the directives and any additional text
-that they specify should be removed, while otherwise leaving the
-file alone.
-.Pp
-The
-.Nm
-utility acts on
-.Ic #if , #ifdef , #ifndef , #elif , #else ,
-and
-.Ic #endif
-lines,
-and it understands only the commonly-used subset
-of the expression syntax for
-.Ic #if
-and
-.Ic #elif
-lines.
-It handles
-integer values of symbols defined on the command line,
-the
-.Fn defined
-operator applied to symbols defined or undefined on the command line,
-the operators
-.Ic \&! , < , > , <= , >= , == , != , && , || ,
-and parenthesized expressions.
-Anything that it does not understand is passed through unharmed.
-It only processes
-.Ic #ifdef
-and
-.Ic #ifndef
-directives if the symbol is specified on the command line,
-otherwise they are also passed through unchanged.
-By default, it ignores
-.Ic #if
-and
-.Ic #elif
-lines with constant expressions,
-or they may be processed by specifying the
-.Fl k
-flag on the command line.
-.Pp
-The
-.Nm
-utility also understands just enough about C
-to know when one of the directives is inactive
-because it is inside
-a comment,
-or affected by a backslash-continued line.
-It spots unusually-formatted preprocessor directives
-and knows when the layout is too odd to handle.
-.Pp
-A script called
-.Nm unifdefall
-can be used to remove all conditional
-.Xr cpp 1
-directives from a file.
-It uses
-.Nm Fl s
-and
-.Nm cpp Fl dM
-to get lists of all the controlling symbols
-and their definitions (or lack thereof),
-then invokes
-.Nm
-with appropriate arguments to process the file.
-.Pp
-Available options:
-.Bl -tag -width indent -compact
-.It Fl D Ns Ar sym Ns Op = Ns Ar val
-Specify that a symbol is defined,
-and optionally specify what value to give it
-for the purpose of handling
-.Ic #if
-and
-.Ic #elif
-directives.
-.It Fl U Ns Ar sym
-Specify that a symbol is undefined.
-If the same symbol appears in more than one argument,
-the last occurrence dominates.
-.It Fl c
-If the
-.Fl c
-flag is specified,
-then the operation of
-.Nm
-is complemented,
-i.e., the lines that would have been removed or blanked
-are retained and vice versa.
-.It Fl e
-Because
-.Nm
-processes its input one line at a time,
-it cannot remove preprocessor directives that span more than one line.
-The most common example of this is a directive with a multi-line
-comment hanging off its right hand end.
-By default,
-if
-.Nm
-has to process such a directive,
-it will complain that the line is too obfuscated.
-The
-.Fl e
-option changes the behaviour so that,
-where possible,
-such lines are left unprocessed instead of reporting an error.
-.It Fl k
-Process
-.Ic #if
-and
-.Ic #elif
-lines with constant expressions.
-By default, sections controlled by such lines are passed through unchanged
-because they typically start
-.Dq Li "#if 0"
-and are used as a kind of comment to sketch out future or past development.
-It would be rude to strip them out, just as it would be for normal comments.
-.It Fl l
-Replace removed lines with blank lines
-instead of deleting them.
-.It Fl o Ar output
-The argument given is the name of an
-.Ar output
-file to be used instead of the standard output.
-This file can be the same as the input file.
-.It Fl s
-Instead of processing the input file as usual,
-this option causes
-.Nm
-to produce a list of symbols that appear in expressions
-that
-.Nm
-understands.
-It is useful in conjunction with the
-.Fl dM
-option of
-.Xr cpp 1
-for creating
-.Nm
-command lines.
-.It Fl t
-Disables parsing for C comments
-and line continuations,
-which is useful
-for plain text.
-.It Fl iD Ns Ar sym Ns Op = Ns Ar val
-.It Fl iU Ns Ar sym
-Ignore
-.Ic #ifdef Ns s .
-If your C code uses
-.Ic #ifdef Ns s
-to delimit non-C lines,
-such as comments
-or code which is under construction,
-then you must tell
-.Nm
-which symbols are used for that purpose so that it will not try to parse
-comments
-and line continuations
-inside those
-.Ic #ifdef Ns s .
-One specifies ignored symbols with
-.Fl iD Ns Ar sym Ns Oo = Ns Ar val Oc
-and
-.Fl iU Ns Ar sym
-similar to
-.Fl D Ns Ar sym Ns Op = Ns Ar val
-and
-.Fl U Ns Ar sym
-above.
-.It Fl I Ns Ar path
-Specifies to
-.Nm unifdefall
-an additional place to look for
-.Ic #include
-files.
-This option is ignored by
-.Nm
-for compatibility with
-.Xr cpp 1
-and to simplify the implementation of
-.Nm unifdefall .
-.El
-.Pp
-The
-.Nm
-utility copies its output to
-.Em stdout
-and will take its input from
-.Em stdin
-if no
-.Ar file
-argument is given.
-.Pp
-The
-.Nm
-utility works nicely with the
-.Fl D Ns Ar sym
-option of
-.Xr diff 1 .
-.Sh DIAGNOSTICS
-.Bl -item
-.It
-Too many levels of nesting.
-.It
-Inappropriate
-.Ic #elif ,
-.Ic #else
-or
-.Ic #endif .
-.It
-Obfuscated preprocessor control line.
-.It
-Premature
-.Dv EOF
-(with the line number of the most recent unterminated
-.Ic #if ) .
-.It
-.Dv EOF
-in comment.
-.El
-.Pp
-The
-.Nm
-utility exits 0 if the output is an exact copy of the input,
-1 if not, and 2 if in trouble.
-.Sh SEE ALSO
-.Xr cpp 1 ,
-.Xr diff 1
-.Sh HISTORY
-The
-.Nm
-command appeared in
-.Bx 4.3 .
-.Tn ANSI\~C
-support was added in
-.Fx 4.7 .
-.Sh BUGS
-Expression evaluation is very limited.
-.Pp
-Preprocessor control lines split across more than one physical line
-(because of comments or backslash-newline)
-cannot be handled in every situation.
-.Pp
-Trigraphs are not recognized.
-.Pp
-There is no support for symbols with different definitions at
-different points in the source file.
-.Pp
-The text-mode and ignore functionality does not correspond to modern
-.Xr cpp 1
-behaviour.