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#!/usr/bin/perl -w

#

# headers_install prepare the listed header files for use in

# user space and copy the files to their destination.

#

# Usage: headers_install.pl readdir installdir arch [files...]

# installdir: dir to install the files to

# arch: current architecture

# arch is used to force a reinstallation when the arch

# changes because kbuild then detect a command line change.

# files: list of files to check

#

# Step in preparation for users space:

# 1) Drop all use of compiler.h definitions

# 2) Drop include of compiler.h

# 3) Drop all sections defined out by __KERNEL__ (using unifdef)

use strict;

my ($installdir, $arch, @files) = @ARGV;

my $unifdef = "scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__";

foreach my $filename (@files) {

my $file = $filename;

$file =~ s!^.*/!!;

my $tmpfile = "$installdir/$file.tmp";

open(my $in, '<', $filename)

or die "$filename: $!\n";

open(my $out, '>', $tmpfile)

or die "$tmpfile: $!\n";

while (my $line = <$in>) {

$line =~ s/([\s(])__user\s/$1/g;

$line =~ s/([\s(])__force\s/$1/g;

$line =~ s/([\s(])__iomem\s/$1/g;

$line =~ s/\s__attribute_const__\s/ /g;

$line =~ s/\s__attribute_const__$//g;

$line =~ s/\b__packed\b/__attribute__((packed))/g;

$line =~ s/^#include <linux\/compiler.h>//;

$line =~ s/(^|\s)(inline)\b/$1__$2__/g;

$line =~ s/(^|\s)(asm)\b(\s|[(]|$)/$1__$2__$3/g;

$line =~ s/(^|\s|[(])(volatile)\b(\s|[(]|$)/$1__$2__$3/g;

$line =~ s/#ifndef\s+_UAPI/#ifndef /;

$line =~ s/#define\s+_UAPI/#define /;

$line =~ s!#endif\s+/[*]\s*_UAPI!#endif /* !;

printf {$out} "%s", $line;

}

close $out;

close $in;

system $unifdef . " $tmpfile > $installdir/$file";

# unifdef will exit 0 on success, and will exit 1 when the

# file was processed successfully but no changes were made,

# so abort only when it's higher than that.

my $e = $? >> 8;

if ($e > 1) {

die "$tmpfile: $!\n";

}

unlink $tmpfile;

}

exit 0;