1#! /usr/bin/perl
2#
3# checkversion find uses of LINUX_VERSION_CODE or KERNEL_VERSION
4# without including <linux/version.h>, or cases of
5# including <linux/version.h> that don't need it.
6# Copyright (C) 2003, Randy Dunlap <rdunlap@xenotime.net>
7
8use strict;
9
10$| = 1;
11
12my $debugging;
13
14foreach my $file (@ARGV) {
15    # Open this file.
16    open( my $f, '<', $file )
17      or die "Can't open $file: $!\n";
18
19    # Initialize variables.
20    my ($fInComment, $fInString, $fUseVersion);
21    my $iLinuxVersion = 0;
22
23    while (<$f>) {
24	# Strip comments.
25	$fInComment && (s+^.*?\*/+ +o ? ($fInComment = 0) : next);
26	m+/\*+o && (s+/\*.*?\*/+ +go, (s+/\*.*$+ +o && ($fInComment = 1)));
27
28	# Pick up definitions.
29	if ( m/^\s*#/o ) {
30	    $iLinuxVersion      = $. if m/^\s*#\s*include\s*"linux\/version\.h"/o;
31	}
32
33	# Strip strings.
34	$fInString && (s+^.*?"+ +o ? ($fInString = 0) : next);
35	m+"+o && (s+".*?"+ +go, (s+".*$+ +o && ($fInString = 1)));
36
37	# Pick up definitions.
38	if ( m/^\s*#/o ) {
39	    $iLinuxVersion      = $. if m/^\s*#\s*include\s*<linux\/version\.h>/o;
40	}
41
42	# Look for uses: LINUX_VERSION_CODE, KERNEL_VERSION, UTS_RELEASE
43	if (($_ =~ /LINUX_VERSION_CODE/) || ($_ =~ /\WKERNEL_VERSION/)) {
44	    $fUseVersion = 1;
45            last if $iLinuxVersion;
46        }
47    }
48
49    # Report used version IDs without include?
50    if ($fUseVersion && ! $iLinuxVersion) {
51	print "$file: $.: need linux/version.h\n";
52    }
53
54    # Report superfluous includes.
55    if ($iLinuxVersion && ! $fUseVersion) {
56	print "$file: $iLinuxVersion linux/version.h not needed.\n";
57    }
58
59    # debug: report OK results:
60    if ($debugging) {
61        if ($iLinuxVersion && $fUseVersion) {
62	    print "$file: version use is OK ($iLinuxVersion)\n";
63        }
64        if (! $iLinuxVersion && ! $fUseVersion) {
65	    print "$file: version use is OK (none)\n";
66        }
67    }
68
69    close($f);
70}
71