1#!/bin/sh
2#
3# unifdefall: remove all the #if's from a source file
4#
5# Copyright (c) 2002 - 2010 Tony Finch <dot@dotat.at>
6# Copyright (c) 2009 - 2010 Jonathan Nieder <jrnieder@gmail.com>
7#
8# Redistribution and use in source and binary forms, with or without
9# modification, are permitted provided that the following conditions
10# are met:
11# 1. Redistributions of source code must retain the above copyright
12#    notice, this list of conditions and the following disclaimer.
13# 2. Redistributions in binary form must reproduce the above copyright
14#    notice, this list of conditions and the following disclaimer in the
15#    documentation and/or other materials provided with the distribution.
16#
17# THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20# ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
21# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27# SUCH DAMAGE.
28#
29# $FreeBSD$
30
31set -e
32
33unifdef="$(dirname "$0")/unifdef"
34if [ ! -e "$unifdef" ]
35then
36	unifdef=unifdef
37fi
38
39case "$@" in
40"-d "*)	echo DEBUGGING 1>&2
41	debug=-d
42	shift
43esac
44
45basename=$(basename "$0")
46tmp=$(mktemp -d "${TMPDIR:-/tmp}/$basename.XXXXXXXXXX") || exit 2
47trap 'rm -r "$tmp" || exit 2' EXIT
48
49export LC_ALL=C
50
51# list of all controlling macros
52"$unifdef" $debug -s "$@" | sort | uniq >"$tmp/ctrl"
53# list of all macro definitions
54cpp -dM "$@" | sort | sed 's/^#define //' >"$tmp/hashdefs"
55# list of defined macro names
56sed 's/[^A-Za-z0-9_].*$//' <"$tmp/hashdefs" >"$tmp/alldef"
57# list of undefined and defined controlling macros
58comm -23 "$tmp/ctrl" "$tmp/alldef" >"$tmp/undef"
59comm -12 "$tmp/ctrl" "$tmp/alldef" >"$tmp/def"
60# create a sed script that extracts the controlling macro definitions
61# and converts them to unifdef command-line arguments
62sed 's|.*|s/^&\\(([^)]*)\\)\\{0,1\\} /-D&=/p|' <"$tmp/def" >"$tmp/script"
63# create the final unifdef command
64{	echo "$unifdef" $debug -k '\'
65	# convert the controlling undefined macros to -U arguments
66	sed 's/.*/-U& \\/' <"$tmp/undef"
67	# convert the controlling defined macros to quoted -D arguments
68	sed -nf "$tmp/script" <"$tmp/hashdefs" |
69		sed "s/'/'\\\\''/g;s/.*/'&' \\\\/"
70	echo '"$@"'
71} >"$tmp/cmd"
72case $debug in
73-d)	for i in ctrl hashdefs alldef undef def script cmd
74	do	echo ==== $i
75		cat "$tmp/$i"
76	done 1>&2
77esac
78# run the command we just created
79sh "$tmp/cmd" "$@"
80