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#! /usr/bin/env perl

# SPDX-License-Identifier: GPL-2.0

#

# checkversion find uses of LINUX_VERSION_CODE or KERNEL_VERSION

# without including <linux/version.h>, or cases of

# including <linux/version.h> that don't need it.

# Copyright (C) 2003, Randy Dunlap <rdunlap@xenotime.net>

use strict;

$| = 1;

my $debugging;

foreach my $file (@ARGV) {

next if $file =~ "include/linux/version\.h";

# Open this file.

open( my $f, '<', $file )

or die "Can't open $file: $!\n";

# Initialize variables.

my ($fInComment, $fInString, $fUseVersion);

my $iLinuxVersion = 0;

while (<$f>) {

# Strip comments.

$fInComment && (s+^.*?\*/+ +o ? ($fInComment = 0) : next);

m+/\*+o && (s+/\*.*?\*/+ +go, (s+/\*.*$+ +o && ($fInComment = 1)));

# Pick up definitions.

if ( m/^\s*#/o ) {

$iLinuxVersion = $. if m/^\s*#\s*include\s*"linux\/version\.h"/o;

}

# Strip strings.

$fInString && (s+^.*?"+ +o ? ($fInString = 0) : next);

m+"+o && (s+".*?"+ +go, (s+".*$+ +o && ($fInString = 1)));

# Pick up definitions.

if ( m/^\s*#/o ) {

$iLinuxVersion = $. if m/^\s*#\s*include\s*<linux\/version\.h>/o;

}

# Look for uses: LINUX_VERSION_CODE, KERNEL_VERSION, UTS_RELEASE

if (($_ =~ /LINUX_VERSION_CODE/) || ($_ =~ /\WKERNEL_VERSION/)) {

$fUseVersion = 1;

last if $iLinuxVersion;

}

}

# Report used version IDs without include?

if ($fUseVersion && ! $iLinuxVersion) {

print "$file: $.: need linux/version.h\n";

}

# Report superfluous includes.

if ($iLinuxVersion && ! $fUseVersion) {

print "$file: $iLinuxVersion linux/version.h not needed.\n";

}

# debug: report OK results:

if ($debugging) {

if ($iLinuxVersion && $fUseVersion) {

print "$file: version use is OK ($iLinuxVersion)\n";

}

if (! $iLinuxVersion && ! $fUseVersion) {

print "$file: version use is OK (none)\n";

}

}

close($f);

}