84a3c48bb4
The old code used a shell loop to convert each controlling macro
definition into a command-line argument, reading the macro definitions
file each time. The new code converts the list of controlling macros
into a sed script which can run through the list of macro definitions
in one go.
Add some explanatory comments, since the code is quite meta.
Use {} instead of () for redirecting a group of commands.
Submitted by: Jonathan Nieder <jrnieder@gmail.com>
62 lines
2.6 KiB
Bash
62 lines
2.6 KiB
Bash
#!/bin/sh
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#
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# unifdefall: remove all the #if's from a source file
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#
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# Copyright (c) 2002 - 2009 Tony Finch <dot@dotat.at>. All rights reserved.
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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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#
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# THIS SOFTWARE IS PROVIDED BY AUTHOR 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 AUTHOR 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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# $dotat: unifdef/unifdefall.sh,v 1.24 2009/11/26 12:54:39 fanf2 Exp $
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# $FreeBSD$
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set -e
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basename=$(basename $0)
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tmp=$(mktemp -d "${TMPDIR:-/tmp}/$basename.XXXXXXXXXX") || exit 2
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trap 'rm -r "$tmp" || exit 1' EXIT
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export LC_ALL=C
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# list of all controlling macros
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unifdef -s "$@" | sort | uniq >"$tmp/ctrl"
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# list of all macro definitions
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cpp -dM "$@" | sort | sed 's/^#define //' >"$tmp/hashdefs"
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# list of defined macro names
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sed 's/[^A-Za-z0-9_].*$//' <"$tmp/hashdefs" >"$tmp/alldef"
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# list of undefined and defined controlling macros
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comm -23 "$tmp/ctrl" "$tmp/alldef" >"$tmp/undef"
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comm -12 "$tmp/ctrl" "$tmp/alldef" >"$tmp/def"
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# create a sed script that extracts the controlling macro definitions
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# and converts them to unifdef command-line arguments
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sed 's|.*|s/^&\\(([^)]*)\\)\\{0,1\\} /-D&=/p|' <"$tmp/def" >"$tmp/script"
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# create the final unifdef command
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{ echo unifdef -k \\
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# convert the controlling undefined macros to -U arguments
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sed 's/.*/-U& \\/' <"$tmp/undef"
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# convert the controlling defined macros to quoted -D arguments
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sed -nf "$tmp/script" <"$tmp/hashdefs" |
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sed "s/'/'\\\\''/g;s/.*/'&' \\\\/"
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echo '"$@"'
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} >"$tmp/cmd"
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# run the command we just created
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sh "$tmp/cmd" "$@"
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