#!/usr/bin/perl -w
# (c) 2001, Dave Jones. (the file handling bit)
# (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
# (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
# (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
# (c) 2014 Gluster Community <gluster-devel@gluster.org>
# Licensed under the terms of the GNU GPL License version 2

use strict;
use POSIX;

my $P = $0;
$P =~ s@.*/@@g;

my $V = '0.32.1';

use Getopt::Long qw(:config no_auto_abbrev);

my $quiet = 0;
my $tree = 1;
my $chk_signoff = 1;
my $chk_patch = 1;
my $tst_only;
my $emacs = 0;
my $terse = 0;
my $file = 0;
my $check = 0;
my $check_orig = 0;
my $summary = 1;
my $mailback = 0;
my $summary_file = 0;
my $show_types = 0;
my $fix = 0;
my $fix_inplace = 0;
my $root;
my %debug;
my %camelcase = ();
my %use_type = ();
my @use = ();
my %ignore_type = ();
my @ignore = ();
my $help = 0;
my $configuration_file = ".checkpatch.conf";
my $max_line_length = 80;
my $ignore_perl_version = 0;
my $minimum_perl_version = 5.10.0;
my $jenkins_url = $ENV{JENKINS_URL};

sub help {
    my ($exitcode) = @_;

    print << "EOM";
Usage: $P [OPTION]... [FILE]...
Version: $V

Options:
  -q, --quiet                quiet
  --patch                    treat FILE as patchfile (default)
  --emacs                    emacs compile window format
  --jenkins-url=STRING       provide URL patch was reviewed on
  --terse                    one line per report
  -f, --file                 treat FILE as regular source file
  --subjective, --strict     enable more subjective tests
  --types TYPE(,TYPE2...)    show only these comma separated message types
  --ignore TYPE(,TYPE2...)   ignore various comma separated message types
  --max-line-length=n        set the maximum line length, if exceeded, warn
  --show-types               show the message "types" in the output
  --root=PATH                PATH to the glusterfs tree root
  --no-summary               suppress the per-file summary
  --mailback                 only produce a report in case of warnings/errors
  --summary-file             include the filename in summary
  --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
                             'values', 'possible', 'type', and 'attr' (default
                             is all off)
  --test-only=WORD           report only warnings/errors containing WORD literally
  --fix                      EXPERIMENTAL - may create horrible results
                             If correctable single-line errors exist, create
                             "<inputfile>.EXPERIMENTAL-checkpatch-fixes"
                             with potential errors corrected to the preferred
                             checkpatch style
  --fix-inplace              EXPERIMENTAL - may create horrible results
                             Is the same as --fix, but overwrites the input
                             file.  It's your fault if there's no backup or git
  --ignore-perl-version      override checking of perl version.  expect
                             runtime errors.
  -h, --help, --version      display this help and exit

When FILE is - read standard input.
EOM

exit($exitcode);
}

my $conf = which_conf($configuration_file);
if (-f $conf) {
    my @conf_args;
    open(my $conffile, '<', "$conf")
        or warn "$P: Can't find a readable $configuration_file file $!\n";

    while (<$conffile>) {
        my $line = $_;

        $line =~ s/\s*\n?$//g;
        $line =~ s/^\s*//g;
        $line =~ s/\s+/ /g;

        next if ($line =~ m/^\s*#/);
        next if ($line =~ m/^\s*$/);

        my @words = split(" ", $line);
        foreach my $word (@words) {
            last if ($word =~ m/^#/);
            push (@conf_args, $word);
        }
    }
    close($conffile);
    unshift(@ARGV, @conf_args) if @conf_args;
}

GetOptions(
    'q|quiet+'  => \$quiet,
    'patch!'    => \$chk_patch,
    'emacs!'    => \$emacs,
    'jenkins-url=s' => \$jenkins_url,
    'terse!'    => \$terse,
    'f|file!'   => \$file,
    'subjective!'       => \$check,
    'strict!'   => \$check,
    'ignore=s'  => \@ignore,
    'types=s'   => \@use,
    'show-types!'       => \$show_types,
    'max-line-length=i' => \$max_line_length,
    'root=s'    => \$root,
    'summary!'  => \$summary,
    'mailback!' => \$mailback,
    'summary-file!'     => \$summary_file,
    'fix!'              => \$fix,
    'fix-inplace!'      => \$fix_inplace,
    'ignore-perl-version!' => \$ignore_perl_version,
    'debug=s'   => \%debug,
    'test-only=s'       => \$tst_only,
    'h|help'    => \$help,
    'version'   => \$help
) or help(1);

help(0) if ($help);

$fix = 1 if ($fix_inplace);
$check_orig = $check;

my $exit = 0;

if ($^V && $^V lt $minimum_perl_version) {
    printf "$P: requires at least perl version %vd\n", $minimum_perl_version;
    if (!$ignore_perl_version) {
        exit(1);
    }
}

if ($#ARGV < 0) {
    print "$P: no input files\n";
    exit(1);
}

sub hash_save_array_words {
    my ($hashRef, $arrayRef) = @_;

    my @array = split(/,/, join(',', @$arrayRef));
    foreach my $word (@array) {
        $word =~ s/\s*\n?$//g;
        $word =~ s/^\s*//g;
        $word =~ s/\s+/ /g;
        $word =~ tr/[a-z]/[A-Z]/;

        next if ($word =~ m/^\s*#/);
        next if ($word =~ m/^\s*$/);

        $hashRef->{$word}++;
    }
}

sub hash_show_words {
    my ($hashRef, $prefix) = @_;

    if ($quiet == 0 && keys %$hashRef) {
        print "NOTE: $prefix message types:";
        foreach my $word (sort keys %$hashRef) {
            print " $word";
        }
        print "\n\n";
    }
}

hash_save_array_words(\%ignore_type, \@ignore);
hash_save_array_words(\%use_type, \@use);

my $dbg_values = 0;
my $dbg_possible = 0;
my $dbg_type = 0;
my $dbg_attr = 0;
for my $key (keys %debug) {
    ## no critic
    eval "\${dbg_$key} = '$debug{$key}';";
    die "$@" if ($@);
}

my $rpt_cleaners = 0;

if ($terse) {
    $emacs = 1;
    $quiet++;
}

if ($tree) {
    if (defined $root) {
        if (!top_of_glusterfs_tree($root)) {
            die "$P: $root: --root does not point at a valid tree\n";
        }
    } else {
        if (top_of_glusterfs_tree('.')) {
            $root = '.';
        } elsif ($0 =~ m@(.*)/extras/[^/]*$@ &&
                 top_of_glusterfs_tree($1)) {
            $root = $1;
        }
    }

    if (!defined $root) {
        print "Must be run from the top-level dir. of a GlusterFS tree\n";
        exit(2);
    }
}

my $emitted_corrupt = 0;

our $Ident      = qr{
                        [A-Za-z_][A-Za-z\d_]*
                        (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
                }x;
our $Storage    = qr{extern|static|asmlinkage};
our $Sparse     = qr{
                        __user|
                        __kernel|
                        __force|
                        __iomem|
                        __must_check|
                        __init_refok|
                        __kprobes|
                        __ref|
                        __rcu
                }x;
our $InitAttributePrefix = qr{__(?:mem|cpu|dev|net_|)};
our $InitAttributeData = qr{$InitAttributePrefix(?:initdata\b)};
our $InitAttributeConst = qr{$InitAttributePrefix(?:initconst\b)};
our $InitAttributeInit = qr{$InitAttributePrefix(?:init\b)};
our $InitAttribute = qr{$InitAttributeData|$InitAttributeConst|$InitAttributeInit};

# Notes to $Attribute:
# We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
our $Attribute  = qr{
                        const|
                        __percpu|
                        __nocast|
                        __safe|
                        __bitwise__|
                        __packed__|
                        __packed2__|
                        __naked|
                        __maybe_unused|
                        __always_unused|
                        __noreturn|
                        __used|
                        __cold|
                        __noclone|
                        __deprecated|
                        __read_mostly|
                        __kprobes|
                        $InitAttribute|
                        ____cacheline_aligned|
                        ____cacheline_aligned_in_smp|
                        ____cacheline_internodealigned_in_smp|
                        __weak
                  }x;
our $Modifier;
our $Inline     = qr{inline|__always_inline|noinline|__inline|__inline__};
our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
our $Lval       = qr{$Ident(?:$Member)*};

our $Int_type   = qr{(?i)llu|ull|ll|lu|ul|l|u};
our $Binary     = qr{(?i)0b[01]+$Int_type?};
our $Hex        = qr{(?i)0x[0-9a-f]+$Int_type?};
our $Int        = qr{[0-9]+$Int_type?};
our $Octal      = qr{0[0-7]+$Int_type?};
our $Float_hex  = qr{(?i)0x[0-9a-f]+p-?[0-9]+[fl]?};
our $Float_dec  = qr{(?i)(?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?};
our $Float_int  = qr{(?i)[0-9]+e-?[0-9]+[fl]?};
our $Float      = qr{$Float_hex|$Float_dec|$Float_int};
our $Constant   = qr{$Float|$Binary|$Octal|$Hex|$Int};
our $Assignment = qr{\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=};
our $Compare    = qr{<=|>=|==|!=|<|(?<!-)>};
our $Arithmetic = qr{\+|-|\*|\/|%};
our $Operators  = qr{
                        <=|>=|==|!=|
                        =>|->|<<|>>|<|>|!|~|
                        &&|\|\||,|\^|\+\+|--|&|\||$Arithmetic
                  }x;

our $c90_Keywords = qr{do|for|while|if|else|return|goto|continue|switch|default|case|break}x;

our $NonptrType;
our $NonptrTypeWithAttr;
our $Type;
our $Declare;

our $NON_ASCII_UTF8     = qr{
        [\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
        |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
        | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
        |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
        |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
        | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
        |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
}x;

our $UTF8       = qr{
        [\x09\x0A\x0D\x20-\x7E]              # ASCII
        | $NON_ASCII_UTF8
}x;

our $typeTypedefs = qr{(?x:
        (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
        atomic_t
)};

our $logFunctions = qr{(?x:
        printk(?:_ratelimited|_once|)|
        (?:[a-z0-9]+_){1,2}(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
        WARN(?:_RATELIMIT|_ONCE|)|
        panic|
        MODULE_[A-Z_]+|
        seq_vprintf|seq_printf|seq_puts
)};

our $signature_tags = qr{(?xi:
        Signed-off-by:|
        Acked-by:|
        Tested-by:|
        Reviewed-by:|
        Reviewed-on:|
        Reported-by:|
        Original-author:|
        Original-Author:|
        Original-Authors:|
        Suggested-by:|
        To:|
        Cc:
)};

our $url_tags = qr{http:|https:};

our @typeList = (
        qr{void},
        qr{(?:unsigned\s+)?char},
        qr{(?:unsigned\s+)?short},
        qr{(?:unsigned\s+)?int},
        qr{(?:unsigned\s+)?long},
        qr{(?:unsigned\s+)?long\s+int},
        qr{(?:unsigned\s+)?long\s+long},
        qr{(?:unsigned\s+)?long\s+long\s+int},
        qr{unsigned},
        qr{float},
        qr{double},
        qr{bool},
        qr{struct\s+$Ident},
        qr{union\s+$Ident},
        qr{enum\s+$Ident},
        qr{${Ident}_t},
        qr{${Ident}_handler},
        qr{${Ident}_handler_fn},
);
our @typeListWithAttr = (
        @typeList,
        qr{struct\s+$InitAttribute\s+$Ident},
        qr{union\s+$InitAttribute\s+$Ident},
);

our @modifierList = (
        qr{fastcall},
);

our @mode_permission_funcs = (
        ["module_param", 3],
        ["module_param_(?:array|named|string)", 4],
        ["module_param_array_named", 5],
        ["debugfs_create_(?:file|u8|u16|u32|u64|x8|x16|x32|x64|size_t|atomic_t|bool|blob|regset32|u32_array)", 2],
        ["proc_create(?:_data|)", 2],
        ["(?:CLASS|DEVICE|SENSOR)_ATTR", 2],
);

#Create a search pattern for all these functions to speed up a loop below
our $mode_perms_search = "";
foreach my $entry (@mode_permission_funcs) {
        $mode_perms_search .= '|' if ($mode_perms_search ne "");
        $mode_perms_search .= $entry->[0];
}

our $declaration_macros = qr{(?x:
        (?:$Storage\s+)?(?:DECLARE|DEFINE)_[A-Z]+\s*\(|
        (?:$Storage\s+)?LIST_HEAD\s*\(
)};

our $allowed_asm_includes = qr{(?x:
        irq|
        memory
)};
# memory.h: ARM has a custom one

sub build_types {
    my $mods = "(?x:\n" . join("|\n  ", @modifierList) . "\n)";
    my $all = "(?x:\n" . join("|\n  ", @typeList) . "\n)";
    my $allWithAttr = "(?x:\n" . join("|\n  ", @typeListWithAttr) . "\n)";
    $Modifier   = qr{(?:$Attribute|$Sparse|$mods)};
    $NonptrType = qr{
                        (?:$Modifier\s+|const\s+)*
                        (?:
                                (?:typeof|__typeof__)\s*\([^\)]*\)|
                                (?:$typeTypedefs\b)|
                                (?:${all}\b)
                        )
                        (?:\s+$Modifier|\s+const)*
                  }x;
        $NonptrTypeWithAttr     = qr{
                        (?:$Modifier\s+|const\s+)*
                        (?:
                                (?:typeof|__typeof__)\s*\([^\)]*\)|
                                (?:$typeTypedefs\b)|
                                (?:${allWithAttr}\b)
                        )
                        (?:\s+$Modifier|\s+const)*
                  }x;
        $Type   = qr{
                        $NonptrType
                        (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*|\[\])+|(?:\s*\[\s*\])+)?
                        (?:\s+$Inline|\s+$Modifier)*
                  }x;
        $Declare        = qr{(?:$Storage\s+(?:$Inline\s+)?)?$Type};
}
build_types();

our $Typecast   = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};

# Using $balanced_parens, $LvalOrFunc, or $FuncArg
# requires at least perl version v5.10.0
# Any use must be runtime checked with $^V

our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/;
our $LvalOrFunc = qr{((?:[\&\*]\s*)?$Lval)\s*($balanced_parens{0,1})\s*};
our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant)};

sub deparenthesize {
    my ($string) = @_;
    return "" if (!defined($string));

    while ($string =~ /^\s*\(.*\)\s*$/) {
        $string =~ s@^\s*\(\s*@@;
        $string =~ s@\s*\)\s*$@@;
    }

    $string =~ s@\s+@ @g;

    return $string;
}

sub seed_camelcase_file {
    my ($file) = @_;

    return if (!(-f $file));

    local $/;

    open(my $include_file, '<', "$file")
        or warn "$P: Can't read '$file' $!\n";
    my $text = <$include_file>;
    close($include_file);

    my @lines = split('\n', $text);

    foreach my $line (@lines) {
        next if ($line !~ /(?:[A-Z][a-z]|[a-z][A-Z])/);
        if ($line =~ /^[ \t]*(?:#[ \t]*define|typedef\s+$Type)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)/) {
            $camelcase{$1} = 1;
        } elsif ($line =~ /^\s*$Declare\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[\(\[,;]/) {
            $camelcase{$1} = 1;
        } elsif ($line =~ /^\s*(?:union|struct|enum)\s+(\w*(?:[A-Z][a-z]|[a-z][A-Z])\w*)\s*[;\{]/) {
            $camelcase{$1} = 1;
        }
    }
}

my $camelcase_seeded = 0;
sub seed_camelcase_includes {
    return if ($camelcase_seeded);

    my $files;
    my $camelcase_cache = "";
    my @include_files = ();

    $camelcase_seeded = 1;

    if (-e ".git") {
        my $git_last_include_commit = `git log --no-merges --pretty=format:"%h%n" -1 -- include`;
        chomp $git_last_include_commit;
        $camelcase_cache = ".checkpatch-camelcase.git.$git_last_include_commit";
    } else {
        my $last_mod_date = 0;
        $files = `find $root/include -name "*.h"`;
        @include_files = split('\n', $files);
        foreach my $file (@include_files) {
            my $date = POSIX::strftime("%Y%m%d%H%M",
                                       localtime((stat $file)[9]));
            $last_mod_date = $date if ($last_mod_date < $date);
        }
        $camelcase_cache = ".checkpatch-camelcase.date.$last_mod_date";
    }

    if ($camelcase_cache ne "" && -f $camelcase_cache) {
        open(my $camelcase_file, '<', "$camelcase_cache")
            or warn "$P: Can't read '$camelcase_cache' $!\n";
        while (<$camelcase_file>) {
            chomp;
            $camelcase{$_} = 1;
        }
        close($camelcase_file);
        return;
    }

    if (-e ".git") {
        $files = `git ls-files "include/*.h"`;
        @include_files = split('\n', $files);
    }

    foreach my $file (@include_files) {
        seed_camelcase_file($file);
    }

    if ($camelcase_cache ne "") {
        unlink glob ".checkpatch-camelcase.*";
        open(my $camelcase_file, '>', "$camelcase_cache")
            or warn "$P: Can't write '$camelcase_cache' $!\n";
        foreach (sort { lc($a) cmp lc($b) } keys(%camelcase)) {
            print $camelcase_file ("$_\n");
        }
        close($camelcase_file);
    }
}

$chk_signoff = 0 if ($file);

my @rawlines = ();
my @lines = ();
my @fixed = ();
my $vname;
for my $filename (@ARGV) {
    my $FILE;
    if ($file) {
        open($FILE, '-|', "diff -u /dev/null $filename") ||
            die "$P: $filename: diff failed - $!\n";
    } elsif ($filename eq '-') {
        open($FILE, '<&STDIN');
    } else {
        open($FILE, '<', "$filename") ||
            die "$P: $filename: open failed - $!\n";
    }
    if ($filename eq '-') {
        $vname = 'Your patch';
    } else {
        $vname = $filename;
    }
    while (<$FILE>) {
        chomp;
        push(@rawlines, $_);
    }
    close($FILE);
    if (!process($filename)) {
        $exit = 1;
    }
    @rawlines = ();
    @lines = ();
    @fixed = ();
}

exit($exit);

sub top_of_glusterfs_tree {
    my ($root) = @_;

    # Add here if the tree changes
    my @tree_check = (
        "api",
        "AUTHORS",
        "autogen.sh",
        "build-aux",
        "ChangeLog",
        "cli",
        "configure.ac",
        "contrib",
        "CONTRIBUTING",
        "COPYING-GPLV2",
        "COPYING-LGPLV3",
        "doc",
        "extras",
        "geo-replication",
        "glusterfs-api.pc.in",
        "glusterfsd",
        "glusterfs-hadoop",
        "glusterfs.spec.in",
        "INSTALL",
        "libgfchangelog.pc.in",
        "libglusterfs",
        "MAINTAINERS",
        "Makefile.am",
        "NEWS",
        "README",
        "rfc.sh",
        "rpc",
        "run-tests.sh",
        "tests",
        "THANKS",
        "xlators",
        );

    foreach my $check (@tree_check) {
        if (! -e $root . '/' . $check) {
            return 0;
        }
    }
    return 1;
}

sub parse_email {
    my ($formatted_email) = @_;

    my $name = "";
    my $address = "";
    my $comment = "";

    if ($formatted_email =~ /^(.*)<(\S+\@\S+)>(.*)$/) {
        $name = $1;
        $address = $2;
        $comment = $3 if defined $3;
    } elsif ($formatted_email =~ /^\s*<(\S+\@\S+)>(.*)$/) {
        $address = $1;
        $comment = $2 if defined $2;
    } elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
        $address = $1;
        $comment = $2 if defined $2;
        $formatted_email =~ s/$address.*$//;
        $name = $formatted_email;
        $name = trim($name);
        $name =~ s/^\"|\"$//g;
        # If there's a name left after stripping spaces and
        # leading quotes, and the address doesn't have both
        # leading and trailing angle brackets, the address
        # is invalid. ie:
        #   "joe smith joe@smith.com" bad
        #   "joe smith <joe@smith.com" bad
        if ($name ne "" && $address !~ /^<[^>]+>$/) {
            $name = "";
            $address = "";
            $comment = "";
        }
    }

    $name = trim($name);
    $name =~ s/^\"|\"$//g;
    $address = trim($address);
    $address =~ s/^\<|\>$//g;

    if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
        $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
        $name = "\"$name\"";
    }

    return ($name, $address, $comment);
}

sub format_email {
    my ($name, $address) = @_;

    my $formatted_email;

    $name = trim($name);
    $name =~ s/^\"|\"$//g;
    $address = trim($address);

    if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
        $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
        $name = "\"$name\"";
    }

    if ("$name" eq "") {
        $formatted_email = "$address";
    } else {
        $formatted_email = "$name <$address>";
    }

    return $formatted_email;
}

sub which_conf {
    my ($conf) = @_;

    foreach my $path (split(/:/, ".:$ENV{HOME}:.scripts")) {
        if (-e "$path/$conf") {
            return "$path/$conf";
        }
    }

    return "";
}

sub expand_tabs {
    my ($str) = @_;

    my $res = '';
    my $n = 0;
    for my $c (split(//, $str)) {
        if ($c eq "\t") {
            $res .= ' ';
            $n++;
            for (; ($n % 8) != 0; $n++) {
                $res .= ' ';
            }
            next;
        }
        $res .= $c;
        $n++;
    }
    return $res;
}
sub copy_spacing {
    (my $res = shift) =~ tr/\t/ /c;
    return $res;
}

sub line_stats {
    my ($line) = @_;

    # Drop the diff line leader and expand tabs
    $line =~ s/^.//;
    $line = expand_tabs($line);

    # Pick the indent from the front of the line.
    my ($white) = ($line =~ /^(\s*)/);

    return (length($line), length($white));
}

my $sanitise_quote = '';

sub sanitise_line_reset {
    my ($in_comment) = @_;

    if ($in_comment) {
        $sanitise_quote = '*/';
    } else {
        $sanitise_quote = '';
    }
}
sub sanitise_line {
    my ($line) = @_;

    my $res = '';
    my $l = '';

    my $qlen = 0;
    my $off = 0;
    my $c;

    # Always copy over the diff marker.
    $res = substr($line, 0, 1);

    for ($off = 1; $off < length($line); $off++) {
        $c = substr($line, $off, 1);

        # Comments we are wacking completly including the begin
        # and end, all to $;.
        if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
            $sanitise_quote = '*/';

            substr($res, $off, 2, "$;$;");
            $off++;
            next;
        }
        if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
            $sanitise_quote = '';
            substr($res, $off, 2, "$;$;");
            $off++;
            next;
        }
        if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
            $sanitise_quote = '//';

            substr($res, $off, 2, $sanitise_quote);
            $off++;
            next;
        }

        # A \ in a string means ignore the next character.
        if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
            $c eq "\\") {
            substr($res, $off, 2, 'XX');
            $off++;
            next;
        }
        # Regular quotes.
        if ($c eq "'" || $c eq '"') {
            if ($sanitise_quote eq '') {
                $sanitise_quote = $c;

                substr($res, $off, 1, $c);
                next;
            } elsif ($sanitise_quote eq $c) {
                $sanitise_quote = '';
            }
        }

        #print "c<$c> SQ<$sanitise_quote>\n";
        if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
            substr($res, $off, 1, $;);
        } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
            substr($res, $off, 1, $;);
        } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
            substr($res, $off, 1, 'X');
        } else {
            substr($res, $off, 1, $c);
        }
    }

    if ($sanitise_quote eq '//') {
        $sanitise_quote = '';
    }

    # The pathname on a #include may be surrounded by '<' and '>'.
    if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
        my $clean = 'X' x length($1);
        $res =~ s@\<.*\>@<$clean>@;

    # The whole of a #error is a string.
    } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
        my $clean = 'X' x length($1);
        $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
    }

    return $res;
}

sub get_quoted_string {
    my ($line, $rawline) = @_;

    return "" if ($line !~ m/(\"[X]+\")/g);
    return substr($rawline, $-[0], $+[0] - $-[0]);
}

sub ctx_statement_block {
    my ($linenr, $remain, $off) = @_;
    my $line = $linenr - 1;
    my $blk = '';
    my $soff = $off;
    my $coff = $off - 1;
    my $coff_set = 0;

    my $loff = 0;

    my $type = '';
    my $level = 0;
    my @stack = ();
    my $p;
    my $c;
    my $len = 0;

    my $remainder;
    while (1) {
        @stack = (['', 0]) if ($#stack == -1);

        #warn "CSB: blk<$blk> remain<$remain>\n";
        # If we are about to drop off the end, pull in more
        # context.
        if ($off >= $len) {
            for (; $remain > 0; $line++) {
                last if (!defined $lines[$line]);
                next if ($lines[$line] =~ /^-/);
                $remain--;
                $loff = $len;
                $blk .= $lines[$line] . "\n";
                $len = length($blk);
                $line++;
                last;
            }
            # Bail if there is no further context.
            #warn "CSB: blk<$blk> off<$off> len<$len>\n";
            if ($off >= $len) {
                last;
            }
            if ($level == 0 && substr($blk, $off) =~ /^.\s*#\s*define/) {
                $level++;
                $type = '#';
            }
        }
        $p = $c;
        $c = substr($blk, $off, 1);
        $remainder = substr($blk, $off);

        #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";

        # Handle nested #if/#else.
        if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
            push(@stack, [ $type, $level ]);
        } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
            ($type, $level) = @{$stack[$#stack - 1]};
        } elsif ($remainder =~ /^#\s*endif\b/) {
            ($type, $level) = @{pop(@stack)};
        }

        # Statement ends at the ';' or a close '}' at the
        # outermost level.
        if ($level == 0 && $c eq ';') {
            last;
        }

        # An else is really a conditional as long as its not else if
        if ($level == 0 && $coff_set == 0 &&
            (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
            $remainder =~ /^(else)(?:\s|{)/ &&
            $remainder !~ /^else\s+if\b/) {
            $coff = $off + length($1) - 1;
            $coff_set = 1;
            #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
            #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
        }

        if (($type eq '' || $type eq '(') && $c eq '(') {
            $level++;
            $type = '(';
        }
        if ($type eq '(' && $c eq ')') {
            $level--;
            $type = ($level != 0)? '(' : '';

            if ($level == 0 && $coff < $soff) {
                $coff = $off;
                $coff_set = 1;
                #warn "CSB: mark coff<$coff>\n";
            }
        }
        if (($type eq '' || $type eq '{') && $c eq '{') {
            $level++;
            $type = '{';
        }
        if ($type eq '{' && $c eq '}') {
            $level--;
            $type = ($level != 0)? '{' : '';

            if ($level == 0) {
                if (substr($blk, $off + 1, 1) eq ';') {
                    $off++;
                }
                last;
            }
        }
        # Preprocessor commands end at the newline unless escaped.
        if ($type eq '#' && $c eq "\n" && $p ne "\\") {
            $level--;
            $type = '';
            $off++;
            last;
        }
        $off++;
    }
    # We are truly at the end, so shuffle to the next line.
    if ($off == $len) {
        $loff = $len + 1;
        $line++;
        $remain--;
    }

    my $statement = substr($blk, $soff, $off - $soff + 1);
    my $condition = substr($blk, $soff, $coff - $soff + 1);

    #warn "STATEMENT<$statement>\n";
    #warn "CONDITION<$condition>\n";

    #print "coff<$coff> soff<$off> loff<$loff>\n";

    return ($statement, $condition,
            $line, $remain + 1, $off - $loff + 1, $level);
}

sub statement_lines {
    my ($stmt) = @_;

    # Strip the diff line prefixes and rip blank lines at start and end.
    $stmt =~ s/(^|\n)./$1/g;
    $stmt =~ s/^\s*//;
    $stmt =~ s/\s*$//;

    my @stmt_lines = ($stmt =~ /\n/g);

    return $#stmt_lines + 2;
}

sub statement_rawlines {
    my ($stmt) = @_;

    my @stmt_lines = ($stmt =~ /\n/g);

    return $#stmt_lines + 2;
}

sub statement_block_size {
    my ($stmt) = @_;

    $stmt =~ s/(^|\n)./$1/g;
    $stmt =~ s/^\s*{//;
    $stmt =~ s/}\s*$//;
    $stmt =~ s/^\s*//;
    $stmt =~ s/\s*$//;

    my @stmt_lines = ($stmt =~ /\n/g);
    my @stmt_statements = ($stmt =~ /;/g);

    my $stmt_lines = $#stmt_lines + 2;
    my $stmt_statements = $#stmt_statements + 1;

    if ($stmt_lines > $stmt_statements) {
        return $stmt_lines;
    } else {
        return $stmt_statements;
    }
}

sub ctx_statement_full {
    my ($linenr, $remain, $off) = @_;
    my ($statement, $condition, $level);

    my (@chunks);

    # Grab the first conditional/block pair.
    ($statement, $condition, $linenr, $remain, $off, $level) =
        ctx_statement_block($linenr, $remain, $off);
    #print "F: c<$condition> s<$statement> remain<$remain>\n";
    push(@chunks, [ $condition, $statement ]);
    if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
        return ($level, $linenr, @chunks);
    }

    # Pull in the following conditional/block pairs and see if they
    # could continue the statement.
    for (;;) {
        ($statement, $condition, $linenr, $remain, $off, $level) =
            ctx_statement_block($linenr, $remain, $off);
        #print "C: c<$condition> s<$statement> remain<$remain>\n";
        last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
        #print "C: push\n";
        push(@chunks, [ $condition, $statement ]);
    }

    return ($level, $linenr, @chunks);
}

sub ctx_block_get {
    my ($linenr, $remain, $outer, $open, $close, $off) = @_;
    my $line;
    my $start = $linenr - 1;
    my $blk = '';
    my @o;
    my @c;
    my @res = ();

    my $level = 0;
    my @stack = ($level);
    for ($line = $start; $remain > 0; $line++) {
        next if ($rawlines[$line] =~ /^-/);
        $remain--;

        $blk .= $rawlines[$line];

        # Handle nested #if/#else.
        if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
            push(@stack, $level);
        } elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
            $level = $stack[$#stack - 1];
        } elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
            $level = pop(@stack);
        }

        foreach my $c (split(//, $lines[$line])) {
            ##print "C<$c>L<$level><$open$close>O<$off>\n";
            if ($off > 0) {
                $off--;
                next;
            }

            if ($c eq $close && $level > 0) {
                $level--;
                last if ($level == 0);
            } elsif ($c eq $open) {
                $level++;
            }
        }

        if (!$outer || $level <= 1) {
            push(@res, $rawlines[$line]);
        }

        last if ($level == 0);
    }

    return ($level, @res);
}
sub ctx_block_outer {
    my ($linenr, $remain) = @_;

    my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
    return @r;
}
sub ctx_block {
    my ($linenr, $remain) = @_;

    my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
    return @r;
}
sub ctx_statement {
    my ($linenr, $remain, $off) = @_;

    my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
    return @r;
}
sub ctx_block_level {
    my ($linenr, $remain) = @_;

    return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
}
sub ctx_statement_level {
    my ($linenr, $remain, $off) = @_;

    return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
}

sub ctx_locate_comment {
    my ($first_line, $end_line) = @_;

    # Catch a comment on the end of the line itself.
    my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
    return $current_comment if (defined $current_comment);

    # Look through the context and try and figure out if there is a
    # comment.
    my $in_comment = 0;
    $current_comment = '';
    for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
        my $line = $rawlines[$linenr - 1];
        #warn "           $line\n";
        if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
            $in_comment = 1;
        }
        if ($line =~ m@/\*@) {
            $in_comment = 1;
        }
        if (!$in_comment && $current_comment ne '') {
            $current_comment = '';
        }
        $current_comment .= $line . "\n" if ($in_comment);
        if ($line =~ m@\*/@) {
            $in_comment = 0;
        }
    }

    chomp($current_comment);
    return($current_comment);
}
sub ctx_has_comment {
    my ($first_line, $end_line) = @_;
    my $cmt = ctx_locate_comment($first_line, $end_line);

    ##print "LINE: $rawlines[$end_line - 1 ]\n";
    ##print "CMMT: $cmt\n";

    return ($cmt ne '');
}

sub raw_line {
    my ($linenr, $cnt) = @_;

    my $offset = $linenr - 1;
    $cnt++;

    my $line;
    while ($cnt) {
        $line = $rawlines[$offset++];
        next if (defined($line) && $line =~ /^-/);
        $cnt--;
    }
    return $line;
}

sub cat_vet {
    my ($vet) = @_;
    my ($res, $coded);

    $res = '';
    while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
        $res .= $1;
        if ($2 ne '') {
            $coded = sprintf("^%c", unpack('C', $2) + 64);
            $res .= $coded;
        }
    }
    $res =~ s/$/\$/;
    return $res;
}

my $av_preprocessor = 0;
my $av_pending;
my @av_paren_type;
my $av_pend_colon;

sub annotate_reset {
    $av_preprocessor = 0;
    $av_pending = '_';
    @av_paren_type = ('E');
    $av_pend_colon = 'O';
}

sub annotate_values {
    my ($stream, $type) = @_;

    my $res;
    my $var = '_' x length($stream);
    my $cur = $stream;

    print "$stream\n" if ($dbg_values > 1);

    while (length($cur)) {
        @av_paren_type = ('E') if ($#av_paren_type < 0);
        print " <" . join('', @av_paren_type) .
            "> <$type> <$av_pending>" if ($dbg_values > 1);
        if ($cur =~ /^(\s+)/o) {
            print "WS($1)\n" if ($dbg_values > 1);
            if ($1 =~ /\n/ && $av_preprocessor) {
                $type = pop(@av_paren_type);
                $av_preprocessor = 0;
            }

        } elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
            print "CAST($1)\n" if ($dbg_values > 1);
            push(@av_paren_type, $type);
            $type = 'c';

        } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
            print "DECLARE($1)\n" if ($dbg_values > 1);
            $type = 'T';

        } elsif ($cur =~ /^($Modifier)\s*/) {
            print "MODIFIER($1)\n" if ($dbg_values > 1);
            $type = 'T';

        } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
            print "DEFINE($1,$2)\n" if ($dbg_values > 1);
            $av_preprocessor = 1;
            push(@av_paren_type, $type);
            if ($2 ne '') {
                $av_pending = 'N';
            }
            $type = 'E';

        } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
            print "UNDEF($1)\n" if ($dbg_values > 1);
            $av_preprocessor = 1;
            push(@av_paren_type, $type);

        } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
            print "PRE_START($1)\n" if ($dbg_values > 1);
            $av_preprocessor = 1;

            push(@av_paren_type, $type);
            push(@av_paren_type, $type);
            $type = 'E';

        } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
            print "PRE_RESTART($1)\n" if ($dbg_values > 1);
            $av_preprocessor = 1;

            push(@av_paren_type, $av_paren_type[$#av_paren_type]);

            $type = 'E';

        } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
            print "PRE_END($1)\n" if ($dbg_values > 1);

            $av_preprocessor = 1;

            # Assume all arms of the conditional end as this
            # one does, and continue as if the #endif was not here.
            pop(@av_paren_type);
            push(@av_paren_type, $type);
            $type = 'E';

        } elsif ($cur =~ /^(\\\n)/o) {
            print "PRECONT($1)\n" if ($dbg_values > 1);

        } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
            print "ATTR($1)\n" if ($dbg_values > 1);
            $av_pending = $type;
            $type = 'N';

        } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
            print "SIZEOF($1)\n" if ($dbg_values > 1);
            if (defined $2) {
                $av_pending = 'V';
            }
            $type = 'N';

        } elsif ($cur =~ /^(if|while|for)\b/o) {
            print "COND($1)\n" if ($dbg_values > 1);
            $av_pending = 'E';
            $type = 'N';

        } elsif ($cur =~/^(case)/o) {
            print "CASE($1)\n" if ($dbg_values > 1);
            $av_pend_colon = 'C';
            $type = 'N';

        } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
            print "KEYWORD($1)\n" if ($dbg_values > 1);
            $type = 'N';

        } elsif ($cur =~ /^(\()/o) {
            print "PAREN('$1')\n" if ($dbg_values > 1);
            push(@av_paren_type, $av_pending);
            $av_pending = '_';
            $type = 'N';

        } elsif ($cur =~ /^(\))/o) {
            my $new_type = pop(@av_paren_type);
            if ($new_type ne '_') {
                $type = $new_type;
                print "PAREN('$1') -> $type\n"
                    if ($dbg_values > 1);
            } else {
                print "PAREN('$1')\n" if ($dbg_values > 1);
            }

        } elsif ($cur =~ /^($Ident)\s*\(/o) {
            print "FUNC($1)\n" if ($dbg_values > 1);
            $type = 'V';
            $av_pending = 'V';

        } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
            if (defined $2 && $type eq 'C' || $type eq 'T') {
                $av_pend_colon = 'B';
            } elsif ($type eq 'E') {
                $av_pend_colon = 'L';
            }
            print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
            $type = 'V';

        } elsif ($cur =~ /^($Ident|$Constant)/o) {
            print "IDENT($1)\n" if ($dbg_values > 1);
            $type = 'V';

        } elsif ($cur =~ /^($Assignment)/o) {
            print "ASSIGN($1)\n" if ($dbg_values > 1);
            $type = 'N';

        } elsif ($cur =~/^(;|{|})/) {
            print "END($1)\n" if ($dbg_values > 1);
            $type = 'E';
            $av_pend_colon = 'O';

        } elsif ($cur =~/^(,)/) {
            print "COMMA($1)\n" if ($dbg_values > 1);
            $type = 'C';

        } elsif ($cur =~ /^(\?)/o) {
            print "QUESTION($1)\n" if ($dbg_values > 1);
            $type = 'N';

        } elsif ($cur =~ /^(:)/o) {
            print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);

            substr($var, length($res), 1, $av_pend_colon);
            if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
                $type = 'E';
            } else {
                $type = 'N';
            }
            $av_pend_colon = 'O';

        } elsif ($cur =~ /^(\[)/o) {
            print "CLOSE($1)\n" if ($dbg_values > 1);
            $type = 'N';

        } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
            my $variant;

            print "OPV($1)\n" if ($dbg_values > 1);
            if ($type eq 'V') {
                $variant = 'B';
            } else {
                $variant = 'U';
            }

            substr($var, length($res), 1, $variant);
            $type = 'N';

        } elsif ($cur =~ /^($Operators)/o) {
            print "OP($1)\n" if ($dbg_values > 1);
            if ($1 ne '++' && $1 ne '--') {
                $type = 'N';
            }

        } elsif ($cur =~ /(^.)/o) {
            print "C($1)\n" if ($dbg_values > 1);
        }
        if (defined $1) {
            $cur = substr($cur, length($1));
            $res .= $type x length($1);
        }
    }

    return ($res, $var);
}

sub possible {
    my ($possible, $line) = @_;
    my $notPermitted = qr{(?:
                ^(?:
                        $Modifier|
                        $Storage|
                        $Type|
                        DEFINE_\S+
                )$|
                ^(?:
                        goto|
                        return|
                        case|
                        else|
                        asm|__asm__|
                        do|
                        \#|
                        \#\#|
                )(?:\s|$)|
                ^(?:typedef|struct|enum)\b
            )}x;
    warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
    if ($possible !~ $notPermitted) {
        # Check for modifiers.
        $possible =~ s/\s*$Storage\s*//g;
        $possible =~ s/\s*$Sparse\s*//g;
        if ($possible =~ /^\s*$/) {

        } elsif ($possible =~ /\s/) {
            $possible =~ s/\s*$Type\s*//g;
            for my $modifier (split(' ', $possible)) {
                if ($modifier !~ $notPermitted) {
                    warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
                    push(@modifierList, $modifier);
                }
            }

        } else {
            warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
            push(@typeList, $possible);
        }
        build_types();
    } else {
        warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
    }
}

my $prefix = '';

sub show_type {
    my ($type) = @_;

    return defined $use_type{$type} if (scalar keys %use_type > 0);

    return !defined $ignore_type{$type};
}

sub report {
    my ($level, $type, $msg) = @_;

    if (!show_type($type) ||
        (defined $tst_only && $msg !~ /\Q$tst_only\E/)) {
        return 0;
    }
    my $line;
    if ($show_types) {
        $line = "$prefix$level:$type: $msg\n";
    } else {
        $line = "$prefix$level: $msg\n";
    }
    $line = (split('\n', $line))[0] . "\n" if ($terse);

    if ($quiet == 0) {
        push(our @report, $line);
    }
    return 1;
}

sub report_dump {
    our @report;
}

sub ERROR {
    my ($type, $msg) = @_;

    if (report("ERROR", $type, $msg)) {
        our $clean = 0;
        our $cnt_error++;
        return 1;
    }
    return 0;
}
sub WARN {
    my ($type, $msg) = @_;

    if (report("WARNING", $type, $msg)) {
        ## Warning is okay to submit
        our $clean = 0;
        our $cnt_warn++;
        return 1;
    }
    return 0;
}
sub CHK {
    my ($type, $msg) = @_;

    if ($check && report("CHECK", $type, $msg)) {
        our $clean = 0;
        our $cnt_chk++;
        return 1;
    }
    return 0;
}

sub check_absolute_file {
    my ($absolute, $herecurr) = @_;
    my $file = $absolute;

    ##print "absolute<$absolute>\n";

    # See if any suffix of this path is a path within the tree.
    while ($file =~ s@^[^/]*/@@) {
        if (-f "$root/$file") {
            ##print "file<$file>\n";
            last;
        }
    }
    if (! -f _)  {
        return 0;
    }

    # It is, so see if the prefix is acceptable.
    my $prefix = $absolute;
    substr($prefix, -length($file)) = '';

    ##print "prefix<$prefix>\n";
    if ($prefix ne ".../") {
        WARN("USE_RELATIVE_PATH",
             "use relative pathname instead of absolute in changelog text\n" . $herecurr);
    }
}

sub trim {
    my ($string) = @_;

    $string =~ s/^\s+|\s+$//g;

    return $string;
}

sub ltrim {
    my ($string) = @_;

    $string =~ s/^\s+//;

    return $string;
}

sub rtrim {
    my ($string) = @_;

    $string =~ s/\s+$//;

    return $string;
}

sub string_find_replace {
    my ($string, $find, $replace) = @_;

    $string =~ s/$find/$replace/g;

    return $string;
}

sub tabify {
    my ($leading) = @_;

    my $source_indent = 8;
    my $max_spaces_before_tab = $source_indent - 1;
    my $spaces_to_tab = " " x $source_indent;

    #convert leading spaces to tabs
    1 while $leading =~ s@^([\t]*)$spaces_to_tab@$1\t@g;
    #Remove spaces before a tab
    1 while $leading =~ s@^([\t]*)( {1,$max_spaces_before_tab})\t@$1\t@g;
    return "$leading";
}

sub pos_last_openparen {
    my ($line) = @_;

    my $pos = 0;

    my $opens = $line =~ tr/\(/\(/;
    my $closes = $line =~ tr/\)/\)/;

    my $last_openparen = 0;

    if (($opens == 0) || ($closes >= $opens)) {
        return -1;
    }

    my $len = length($line);

    for ($pos = 0; $pos < $len; $pos++) {
        my $string = substr($line, $pos);
        if ($string =~ /^($FuncArg|$balanced_parens)/) {
            $pos += length($1) - 1;
        } elsif (substr($line, $pos, 1) eq '(') {
            $last_openparen = $pos;
        } elsif (index($string, '(') == -1) {
            last;
        }
    }

    return length(expand_tabs(substr($line, 0, $last_openparen))) + 1;
}

sub process {
    my $filename = shift;

    my $linenr=0;
    my $prevline="";
    my $prevrawline="";
    my $stashline="";
    my $stashrawline="";

    my $length;
    my $indent;
    my $previndent=0;
    my $stashindent=0;

    our $clean = 1;
    my $signoff = 0;
    my $is_patch = 0;

    my $in_header_lines = 1;
    my $in_commit_log = 0; #Scanning lines before patch

    my $non_utf8_charset = 0;

    our @report = ();
    our $cnt_lines = 0;
    our $cnt_error = 0;
    our $cnt_warn = 0;
    our $cnt_chk = 0;

    # Trace the real file/line as we go.
    my $realfile = '';
    my $realline = 0;
    my $realcnt = 0;
    my $here = '';
    my $in_comment = 0;
    my $comment_edge = 0;
    my $first_line = 0;
    my $p1_prefix = '';

    my $prev_values = 'E';

    # suppression flags
    my %suppress_ifbraces;
    my %suppress_whiletrailers;
    my %suppress_export;
    my $suppress_statement = 0;

    my %signatures = ();

    # Pre-scan the patch sanitizing the lines.
    # Pre-scan the patch looking for any __setup documentation.
    #
    my @setup_docs = ();
    my $setup_docs = 0;

    my $camelcase_file_seeded = 0;

    sanitise_line_reset();
    my $line;
    foreach my $rawline (@rawlines) {
        $linenr++;
        $line = $rawline;

        push(@fixed, $rawline) if ($fix);

        if ($rawline=~/^\+\+\+\s+(\S+)/) {
            $setup_docs = 0;
            if ($1 =~ m@Documentation/kernel-parameters.txt$@) {
                $setup_docs = 1;
            }
            #next;
        }
        if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
            $realline=$1-1;
            if (defined $2) {
                $realcnt=$3+1;
            } else {
                $realcnt=1+1;
            }
            $in_comment = 0;

            # Guestimate if this is a continuing comment.  Run
            # the context looking for a comment "edge".  If this
            # edge is a close comment then we must be in a comment
            # at context start.
            my $edge;
            my $cnt = $realcnt;
            for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
                next if (defined $rawlines[$ln - 1] &&
                         $rawlines[$ln - 1] =~ /^-/);
                $cnt--;
                #print "RAW<$rawlines[$ln - 1]>\n";
                last if (!defined $rawlines[$ln - 1]);
                if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
                    $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
                    ($edge) = $1;
                    last;
                }
            }
            if (defined $edge && $edge eq '*/') {
                $in_comment = 1;
            }

            # Guestimate if this is a continuing comment.  If this
            # is the start of a diff block and this line starts
            # ' *' then it is very likely a comment.
            if (!defined $edge &&
                $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
            {
                $in_comment = 1;
            }

            ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
            sanitise_line_reset($in_comment);

        } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
            # Standardise the strings and chars within the input to
            # simplify matching -- only bother with positive lines.
            $line = sanitise_line($rawline);
        }
        push(@lines, $line);

        if ($realcnt > 1) {
            $realcnt-- if ($line =~ /^(?:\+| |$)/);
        } else {
            $realcnt = 0;
        }

        #print "==>$rawline\n";
        #print "-->$line\n";

        if ($setup_docs && $line =~ /^\+/) {
            push(@setup_docs, $line);
        }
    }

    $prefix = '';

    $realcnt = 0;
    $linenr = 0;
    foreach my $line (@lines) {
        $linenr++;
        my $sline = $line;      #copy of $line
        $sline =~ s/$;/ /g;     #with comments as spaces

        my $rawline = $rawlines[$linenr - 1];

#extract the line range in the file after the patch is applied
        if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
            $is_patch = 1;
            $first_line = $linenr + 1;
            $realline=$1-1;
            if (defined $2) {
                $realcnt=$3+1;
            } else {
                $realcnt=1+1;
            }
            annotate_reset();
            $prev_values = 'E';

            %suppress_ifbraces = ();
            %suppress_whiletrailers = ();
            %suppress_export = ();
            $suppress_statement = 0;
            next;

# track the line number as we move through the hunk, note that
# new versions of GNU diff omit the leading space on completely
# blank context lines so we need to count that too.
        } elsif ($line =~ /^( |\+|$)/) {
            $realline++;
            $realcnt-- if ($realcnt != 0);

            # Measure the line length and indent.
            ($length, $indent) = line_stats($rawline);

            # Track the previous line.
            ($prevline, $stashline) = ($stashline, $line);
            ($previndent, $stashindent) = ($stashindent, $indent);
            ($prevrawline, $stashrawline) = ($stashrawline, $rawline);

            #warn "line<$line>\n";

        } elsif ($realcnt == 1) {
            $realcnt--;
        }

        my $hunk_line = ($realcnt != 0);

#make up the handle for any error we report on this line
        $prefix = "$filename:$realline: " if ($emacs && $file);
        $prefix = "$filename:$linenr: " if ($emacs && !$file);

        $here = "#$linenr: " if (!$file);
        $here = "#$realline: " if ($file);

        my $found_file = 0;
        # extract the filename as it passes
        if ($line =~ /^diff --git.*?(\S+)$/) {
            $realfile = $1;
            $realfile =~ s@^([^/]*)/@@ if (!$file);
            $in_commit_log = 0;
            $found_file = 1;
        } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
            $realfile = $1;
            $realfile =~ s@^([^/]*)/@@ if (!$file);
            $in_commit_log = 0;

            $p1_prefix = $1;
            if (!$file && $tree && $p1_prefix ne '' &&
                -e "$root/$p1_prefix") {
                WARN("PATCH_PREFIX",
                     "patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
            }

            $found_file = 1;
        }

        if ($found_file) {
            if ($realfile =~ m@^(drivers/net/|net/)@) {
                $check = 1;
            } else {
                $check = $check_orig;
            }
            next;
        }

        $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);

        my $hereline = "$here\n$rawline\n";
        my $herecurr = "$here\n$rawline\n";
        my $hereprev = "$here\n$prevrawline\n$rawline\n";

        $cnt_lines++ if ($realcnt != 0);

# Check for incorrect file permissions
        if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
            my $permhere = $here . "FILE: $realfile\n";
            if ($realfile !~ m@scripts/@ &&
                $realfile !~ /\.(py|pl|awk|sh|t)$/) {
                ERROR("EXECUTE_PERMISSIONS",
                      "do not set execute permissions for source files\n" . $permhere);
            }
        }

        next if ($realfile =~ /(checkpatch.pl)/);
        next if ($realfile =~ /\.(md|txt|doc|8|pdf|tex)$/);

# Check the patch for a signoff:
        if ($line =~ /^\s*signed-off-by:/i) {
            $signoff++;
            $in_commit_log = 0;
        }

# Check signature styles
        if (!$in_header_lines &&
            $line =~ /^(\s*)([a-z0-9_-]+by:|$signature_tags)(\s*)(.*)/i) {
            my $space_before = $1;
            my $sign_off = $2;
            my $space_after = $3;
            my $email = $4;
            my $ucfirst_sign_off = ucfirst(lc($sign_off));

            if ($sign_off !~ /$signature_tags/) {
                WARN("BAD_SIGN_OFF",
                     "Non-standard signature: $sign_off\n" . $herecurr);
            }
            if (defined $space_before && $space_before ne "") {
                if (WARN("BAD_SIGN_OFF",
                         "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr) &&
                    $fix) {
                    $fixed[$linenr - 1] =
                        "$ucfirst_sign_off $email";
                }
            }
            if ($sign_off =~ /-by:$/i && $sign_off ne $ucfirst_sign_off) {
                if (WARN("BAD_SIGN_OFF",
                         "'$ucfirst_sign_off' is the preferred signature form\n" . $herecurr) &&
                    $fix) {
                    $fixed[$linenr - 1] =
                        "$ucfirst_sign_off $email";
                }

            }
            if (!defined $space_after || $space_after ne " ") {
                if (WARN("BAD_SIGN_OFF",
                         "Use a single space after $ucfirst_sign_off\n" . $herecurr) &&
                    $fix) {
                    $fixed[$linenr - 1] =
                        "$ucfirst_sign_off $email";
                }
            }

            # Check if email is really Jenkins URL
            if ($email =~ /^($url_tags)(.*)/) {
                my $uri = $1;
                my $url = $2;
                if ($uri && $url !~ /$jenkins_url/) {
                    ERROR("BAD_URL",
                          "Unrecognized url address: '$email'\n" . $herecurr);
                }
            } else {
                my ($email_name, $email_address, $comment) = parse_email($email);
                my $suggested_email = format_email(($email_name, $email_address));
                if ($suggested_email eq "") {
                    ERROR("BAD_SIGN_OFF",
                          "Unrecognized email address: '$email'\n" . $herecurr);
                } else {
                    my $dequoted = $suggested_email;
                    $dequoted =~ s/^"//;
                    $dequoted =~ s/" </ </;
                    # Don't force email to have quotes
                    # Allow just an angle bracketed address
                    if ("$dequoted$comment" ne $email &&
                        "<$email_address>$comment" ne $email &&
                        "$suggested_email$comment" ne $email) {
                        WARN("BAD_SIGN_OFF",
                             "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
                    }
                }
            }

# Check for duplicate signatures
            my $sig_nospace = $line;
            $sig_nospace =~ s/\s//g;
            $sig_nospace = lc($sig_nospace);
            if (defined $signatures{$sig_nospace}) {
                WARN("BAD_SIGN_OFF",
                     "Duplicate signature\n" . $herecurr);
            } else {
                $signatures{$sig_nospace} = 1;
            }
        }

# Check for wrappage within a valid hunk of the file
        if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
            ERROR("CORRUPTED_PATCH",
                  "patch seems to be corrupt (line wrapped?)\n" .
                  $herecurr) if (!$emitted_corrupt++);
        }

# Check for absolute kernel paths.
        if ($tree) {
            while ($line =~ m{(?:^|\s)(/\S*)}g) {
                my $file = $1;

                if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
                    check_absolute_file($1, $herecurr)) {
                    #
                } else {
                    check_absolute_file($file, $herecurr);
                }
            }
        }

# UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
        if (($realfile =~ /^$/ || $line =~ /^\+/) &&
            $rawline !~ m/^$UTF8*$/) {
            my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);

            my $blank = copy_spacing($rawline);
            my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
            my $hereptr = "$hereline$ptr\n";

            CHK("INVALID_UTF8",
                "Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
        }

# Check if it's the start of a commit log
# (not a header line and we haven't seen the patch filename)
        if ($in_header_lines && $realfile =~ /^$/ &&
            $rawline !~ /^(commit\b|from\b|[\w-]+:).+$/i) {
            $in_header_lines = 0;
            $in_commit_log = 1;
        }

# Check if there is UTF-8 in a commit log when a mail header has explicitly
# declined it, i.e defined some charset where it is missing.
        if ($in_header_lines &&
            $rawline =~ /^Content-Type:.+charset="(.+)".*$/ &&
            $1 !~ /utf-8/i) {
            $non_utf8_charset = 1;
        }

        if ($in_commit_log && $non_utf8_charset && $realfile =~ /^$/ &&
            $rawline =~ /$NON_ASCII_UTF8/) {
            WARN("UTF8_BEFORE_PATCH",
                 "8-bit UTF-8 used in possible commit log\n" . $herecurr);
        }

# ignore non-hunk lines and lines being removed
        next if (!$hunk_line || $line =~ /^-/);

#trailing whitespace
        if ($line =~ /^\+.*\015/) {
            my $herevet = "$here\n" . cat_vet($rawline) . "\n";
            if (ERROR("DOS_LINE_ENDINGS",
                      "DOS line endings\n" . $herevet) &&
                $fix) {
                $fixed[$linenr - 1] =~ s/[\s\015]+$//;
            }
        } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
            my $herevet = "$here\n" . cat_vet($rawline) . "\n";
            if (ERROR("TRAILING_WHITESPACE",
                      "trailing whitespace\n" . $herevet) &&
                $fix) {
                $fixed[$linenr - 1] =~ s/\s+$//;
            }

            $rpt_cleaners = 1;
        }

        if (($realfile =~ /Makefile.*/) &&
            ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
            my $flag = $1;
            my $replacement = {
                            'EXTRA_AFLAGS' =>   'asflags-y',
                            'EXTRA_CFLAGS' =>   'ccflags-y',
                            'EXTRA_CPPFLAGS' => 'cppflags-y',
                            'EXTRA_LDFLAGS' =>  'ldflags-y',
            };

            WARN("DEPRECATED_VARIABLE",
                 "Use of $flag is deprecated, please use \`$replacement->{$flag} instead.\n" . $herecurr) if ($replacement->{$flag});
        }


# check we are in a valid source file if not then ignore this hunk
        next if ($realfile !~ /\.(h|c|pl|py|l|y|sh|in)$/);

#line length limit
        if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
            $rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
            !($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?"[X\t]*"\s*(?:|,|\)\s*;)\s*$/ ||
              $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
            $length > $max_line_length)
        {
            WARN("LONG_LINE",
                 "line over $max_line_length characters\n" . $herecurr);
        }

# Check for user-visible strings broken across lines, which breaks the ability
# to grep for the string.  Make exceptions when the previous string ends in a
# newline (multiple lines in one string constant) or '\t', '\r', ';', or '{'
# (common in inline assembly) or is a octal \123 or hexadecimal \xaf value
        if ($line =~ /^\+\s*"/ &&
            $prevline =~ /"\s*$/ &&
            $prevrawline !~ /(?:\\(?:[ntr]|[0-7]{1,3}|x[0-9a-fA-F]{1,2})|;\s*|\{\s*)"\s*$/) {
            WARN("SPLIT_STRING",
                 "quoted string split across lines\n" . $hereprev);
        }

# check for spaces before a quoted newline
        if ($rawline =~ /^.*\".*\s\\n/) {
            if (WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",
                     "unnecessary whitespace before a quoted newline\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~ s/^(\+.*\".*)\s+\\n/$1\\n/;
            }

        }

# check for adding lines without a newline.
        if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
            WARN("MISSING_EOF_NEWLINE",
                 "adding a line without newline at end of file\n" . $herecurr);
        }

# check we are in a valid source file C or perl if not then ignore this hunk
        next if ($realfile !~ /\.(h|c|pl)$/);

# check for space before tabs.
        if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
            my $herevet = "$here\n" . cat_vet($rawline) . "\n";
            if (WARN("SPACE_BEFORE_TAB",
                     "please, no space before tabs\n" . $herevet) &&
                $fix) {
                while ($fixed[$linenr - 1] =~
                       s/(^\+.*) {8,8}+\t/$1\t\t/) {}
                while ($fixed[$linenr - 1] =~
                       s/(^\+.*) +\t/$1\t/) {}
            }
        }

# check for && or || at the start of a line
        if ($rawline =~ /^\+\s*(&&|\|\|)/) {
            CHK("LOGICAL_CONTINUATIONS",
                "Logical continuations should be on the previous line\n" . $hereprev);
        }

# check multi-line statement indentation matches previous line
        if ($^V && $^V ge 5.10.0 &&
            $prevline =~ /^\+([ \t]*)((?:$c90_Keywords(?:\s+if)\s*)|(?:$Declare\s*)?(?:$Ident|\(\s*\*\s*$Ident\s*\))\s*|$Ident\s*=\s*$Ident\s*)\(.*(\&\&|\|\||,)\s*$/) {
            $prevline =~ /^\+(\t*)(.*)$/;
            my $oldindent = $1;
            my $rest = $2;

            my $pos = pos_last_openparen($rest);
            if ($pos >= 0) {
                $line =~ /^(\+| )([ \t]*)/;
                my $newindent = $2;

                my $goodtabindent = $oldindent .
                    "\t" x ($pos / 8) .
                    " "  x ($pos % 8);
                my $goodspaceindent = $oldindent . " "  x $pos;

                if ($newindent ne $goodtabindent &&
                    $newindent ne $goodspaceindent) {

                    if (CHK("PARENTHESIS_ALIGNMENT",
                            "Alignment should match open parenthesis\n" . $hereprev) &&
                        $fix && $line =~ /^\+/) {
                        $fixed[$linenr - 1] =~
                            s/^\+[ \t]*/\+$goodtabindent/;
                    }
                }
            }
        }

        if ($line =~ /^\+.*\*[ \t]*\)[ \t]+(?!$Assignment|$Arithmetic)/) {
            if (CHK("SPACING",
                    "No space is necessary after a cast\n" . $hereprev) &&
                $fix) {
                $fixed[$linenr - 1] =~
                    s/^(\+.*\*[ \t]*\))[ \t]+/$1/;
            }
        }


# check for missing blank lines after declarations
        if ($sline =~ /^\+\s+\S/ &&  #Not at char 1
            # actual declarations
            ($prevline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
             # foo bar; where foo is some local typedef or #define
             $prevline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
             # known declaration macros
             $prevline =~ /^\+\s+$declaration_macros/) &&
            # for "else if" which can look like "$Ident $Ident"
            !($prevline =~ /^\+\s+$c90_Keywords\b/ ||
              # other possible extensions of declaration lines
              $prevline =~ /(?:$Compare|$Assignment|$Operators)\s*$/ ||
              # not starting a section or a macro "\" extended line
              $prevline =~ /(?:\{\s*|\\)$/) &&
            # looks like a declaration
            !($sline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
              # foo bar; where foo is some local typedef or #define
              $sline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ ||
              # known declaration macros
              $sline =~ /^\+\s+$declaration_macros/ ||
              # start of struct or union or enum
              $sline =~ /^\+\s+(?:union|struct|enum|typedef)\b/ ||
              # start or end of block or continuation of declaration
              $sline =~ /^\+\s+(?:$|[\{\}\.\#\"\?\:\(\[])/ ||
              # bitfield continuation
              $sline =~ /^\+\s+$Ident\s*:\s*\d+\s*[,;]/ ||
              # other possible extensions of declaration lines
              $sline =~ /^\+\s+\(?\s*(?:$Compare|$Assignment|$Operators)/) &&
            # indentation of previous and current line are the same
            (($prevline =~ /\+(\s+)\S/) && $sline =~ /^\+$1\S/)) {
            WARN("SPACING",
                 "Missing a blank line after declarations\n" . $hereprev);
        }

# check we are in a valid C source file if not then ignore this hunk
        next if ($realfile !~ /\.(h|c)$/);

# check for RCS/CVS revision markers
        if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
            WARN("CVS_KEYWORD",
                 "CVS style keyword markers, these will _not_ be updated\n". $herecurr);
        }

# Check for potential 'bare' types
        my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
            $realline_next);
#print "LINE<$line>\n";
        if ($linenr >= $suppress_statement &&
            $realcnt && $sline =~ /.\s*\S/) {
            ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
                ctx_statement_block($linenr, $realcnt, 0);
            $stat =~ s/\n./\n /g;
            $cond =~ s/\n./\n /g;

#print "linenr<$linenr> <$stat>\n";
            # If this statement has no statement boundaries within
            # it there is no point in retrying a statement scan
            # until we hit end of it.
            my $frag = $stat; $frag =~ s/;+\s*$//;
            if ($frag !~ /(?:{|;)/) {
#print "skip<$line_nr_next>\n";
                $suppress_statement = $line_nr_next;
            }

            # Find the real next line.
            $realline_next = $line_nr_next;
            if (defined $realline_next &&
                (!defined $lines[$realline_next - 1] ||
                 substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
                $realline_next++;
            }

            my $s = $stat;
            $s =~ s/{.*$//s;

            # Ignore goto labels.
            if ($s =~ /$Ident:\*$/s) {

                # Ignore functions being called
            } elsif ($s =~ /^.\s*$Ident\s*\(/s) {

            } elsif ($s =~ /^.\s*else\b/s) {

                # declarations always start with types
            } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
                my $type = $1;
                $type =~ s/\s+/ /g;
                possible($type, "A:" . $s);

                # definitions in global scope can only start with types
            } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
                possible($1, "B:" . $s);
            }

            # any (foo ... *) is a pointer cast, and foo is a type
            while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
                possible($1, "C:" . $s);
            }

            # Check for any sort of function declaration.
            # int foo(something bar, other baz);
            # void (*store_gdt)(x86_descr_ptr *);
            if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
                my ($name_len) = length($1);

                my $ctx = $s;
                substr($ctx, 0, $name_len + 1, '');
                $ctx =~ s/\)[^\)]*$//;

                for my $arg (split(/\s*,\s*/, $ctx)) {
                    if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {

                        possible($1, "D:" . $s);
                    }
                }
            }

        }

#
# Checks which may be anchored in the context.
#

# Check for switch () and associated case and default
# statements should be at the same indent.
        if ($line=~/\bswitch\s*\(.*\)/) {
            my $err = '';
            my $sep = '';
            my @ctx = ctx_block_outer($linenr, $realcnt);
            shift(@ctx);
            for my $ctx (@ctx) {
                my ($clen, $cindent) = line_stats($ctx);
                if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
                    $indent != $cindent) {
                    $err .= "$sep$ctx\n";
                    $sep = '';
                } else {
                    $sep = "[...]\n";
                }
            }
            if ($err ne '') {
                ERROR("SWITCH_CASE_INDENT_LEVEL",
                      "switch and case should be at the same indent\n$hereline$err");
            }
        }

# if/while/etc brace do not go on next line, unless defining a do while loop,
# or if that brace on the next line is for something else
        if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
            my $pre_ctx = "$1$2";

            my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);

            if ($line =~ /^\+\t{6,}/) {
                WARN("DEEP_INDENTATION",
                     "Too many leading tabs - consider code refactoring\n" . $herecurr);
            }

            my $ctx_cnt = $realcnt - $#ctx - 1;
            my $ctx = join("\n", @ctx);

            my $ctx_ln = $linenr;
            my $ctx_skip = $realcnt;

            while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
                                            defined $lines[$ctx_ln - 1] &&
                                            $lines[$ctx_ln - 1] =~ /^-/)) {
                ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
                $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
                $ctx_ln++;
            }

            #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
            #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";

            if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln -1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
                ERROR("OPEN_BRACE",
                      "that open brace { should be on the previous line\n" .
                      "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
            }
            if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
                $ctx =~ /\)\s*\;\s*$/ &&
                defined $lines[$ctx_ln - 1])
            {
                my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
                if ($nindent > $indent) {
                    WARN("TRAILING_SEMICOLON",
                         "trailing semicolon indicates no statements, indent implies otherwise\n" .
                         "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
                }
            }
        }

# Check relative indent for conditionals and blocks.
        if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
            ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
                ctx_statement_block($linenr, $realcnt, 0)
                if (!defined $stat);
            my ($s, $c) = ($stat, $cond);

            substr($s, 0, length($c), '');

            # Make sure we remove the line prefixes as we have
            # none on the first line, and are going to readd them
            # where necessary.
            $s =~ s/\n./\n/gs;

            # Find out how long the conditional actually is.
            my @newlines = ($c =~ /\n/gs);
            my $cond_lines = 1 + $#newlines;

            # We want to check the first line inside the block
            # starting at the end of the conditional, so remove:
            #  1) any blank line termination
            #  2) any opening brace { on end of the line
            #  3) any do (...) {
            my $continuation = 0;
            my $check = 0;
            $s =~ s/^.*\bdo\b//;
            $s =~ s/^\s*{//;
            if ($s =~ s/^\s*\\//) {
                $continuation = 1;
            }
            if ($s =~ s/^\s*?\n//) {
                $check = 1;
                $cond_lines++;
            }

            # Also ignore a loop construct at the end of a
            # preprocessor statement.
            if (($prevline =~ /^.\s*#\s*define\s/ ||
                 $prevline =~ /\\\s*$/) && $continuation == 0) {
                $check = 0;
            }

            my $cond_ptr = -1;
            $continuation = 0;
            while ($cond_ptr != $cond_lines) {
                $cond_ptr = $cond_lines;

                # If we see an #else/#elif then the code
                # is not linear.
                if ($s =~ /^\s*\#\s*(?:else|elif)/) {
                    $check = 0;
                }

                # Ignore:
                #  1) blank lines, they should be at 0,
                #  2) preprocessor lines, and
                #  3) labels.
                if ($continuation ||
                    $s =~ /^\s*?\n/ ||
                    $s =~ /^\s*#\s*?/ ||
                    $s =~ /^\s*$Ident\s*:/) {
                    $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
                    if ($s =~ s/^.*?\n//) {
                        $cond_lines++;
                    }
                }
            }

            my (undef, $sindent) = line_stats("+" . $s);
            my $stat_real = raw_line($linenr, $cond_lines);

            # Check if either of these lines are modified, else
            # this is not this patch's fault.
            if (!defined($stat_real) ||
                $stat !~ /^\+/ && $stat_real !~ /^\+/) {
                $check = 0;
            }
            if (defined($stat_real) && $cond_lines > 1) {
                $stat_real = "[...]\n$stat_real";
            }

            #print "line<$line> prevline<$prevline> indent<$indent> sindent<$sindent> check<$check> continuation<$continuation> s<$s> cond_lines<$cond_lines> stat_real<$stat_real> stat<$stat>\n";

            if ($check && (($sindent % 8) != 0 ||
                           ($sindent <= $indent && $s ne ''))) {
                WARN("SUSPECT_CODE_INDENT",
                     "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
            }
        }

        # Track the 'values' across context and added lines.
        my $opline = $line; $opline =~ s/^./ /;
        my ($curr_values, $curr_vars) =
            annotate_values($opline . "\n", $prev_values);
        $curr_values = $prev_values . $curr_values;
        if ($dbg_values) {
            my $outline = $opline; $outline =~ s/\t/ /g;
            print "$linenr > .$outline\n";
            print "$linenr > $curr_values\n";
            print "$linenr >  $curr_vars\n";
        }
        $prev_values = substr($curr_values, -1);

#ignore lines not being added
        next if ($line =~ /^[^\+]/);

# TEST: allow direct testing of the type matcher.
        if ($dbg_type) {
            if ($line =~ /^.\s*$Declare\s*$/) {
                ERROR("TEST_TYPE",
                      "TEST: is type\n" . $herecurr);
            } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
                ERROR("TEST_NOT_TYPE",
                      "TEST: is not type ($1 is)\n". $herecurr);
            }
            next;
        }
# TEST: allow direct testing of the attribute matcher.
        if ($dbg_attr) {
            if ($line =~ /^.\s*$Modifier\s*$/) {
                ERROR("TEST_ATTR",
                      "TEST: is attr\n" . $herecurr);
            } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
                ERROR("TEST_NOT_ATTR",
                      "TEST: is not attr ($1 is)\n". $herecurr);
            }
            next;
        }

# check for initialisation to aggregates open brace on the next line
        if ($line =~ /^.\s*{/ &&
            $prevline =~ /(?:^|[^=])=\s*$/) {
            ERROR("OPEN_BRACE",
                  "that open brace { should be on the previous line\n" . $hereprev);
        }

#
# Checks which are anchored on the added line.
#

# check for malformed paths in #include statements (uses RAW line)
        if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
            my $path = $1;
            if ($path =~ m{//}) {
                ERROR("MALFORMED_INCLUDE",
                      "malformed #include filename\n" . $herecurr);
            }
            if ($path =~ "^uapi/" && $realfile =~ m@\binclude/uapi/@) {
                ERROR("UAPI_INCLUDE",
                      "No #include in ...include/uapi/... should use a uapi/ path prefix\n" . $herecurr);
            }
        }

# no C99 // comments
        if ($line =~ m{//}) {
            if (ERROR("C99_COMMENTS",
                      "do not use C99 // comments\n" . $herecurr) &&
                $fix) {
                my $line = $fixed[$linenr - 1];
                if ($line =~ /\/\/(.*)$/) {
                    my $comment = trim($1);
                    $fixed[$linenr - 1] =~ s@\/\/(.*)$@/\* $comment \*/@;
                }
            }
        }
        # Remove C99 comments.
        $line =~ s@//.*@@;
        $opline =~ s@//.*@@;

# EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
# the whole statement.
#print "APW <$lines[$realline_next - 1]>\n";
        if (defined $realline_next &&
            exists $lines[$realline_next - 1] &&
            !defined $suppress_export{$realline_next} &&
            ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
             $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
            # Handle definitions which produce identifiers with
            # a prefix:
            #   XXX(foo);
            #   EXPORT_SYMBOL(something_foo);
            my $name = $1;
            if ($stat =~ /^(?:.\s*}\s*\n)?.([A-Z_]+)\s*\(\s*($Ident)/ &&
                $name =~ /^${Ident}_$2/) {
#print "FOO C name<$name>\n";
                $suppress_export{$realline_next} = 1;

            } elsif ($stat !~ /(?:
                                \n.}\s*$|
                                ^.DEFINE_$Ident\(\Q$name\E\)|
                                ^.DECLARE_$Ident\(\Q$name\E\)|
                                ^.LIST_HEAD\(\Q$name\E\)|
                                ^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
                                \b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
                            )/x) {
#print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
                $suppress_export{$realline_next} = 2;
            } else {
                $suppress_export{$realline_next} = 1;
            }
        }
        if (!defined $suppress_export{$linenr} &&
            $prevline =~ /^.\s*$/ &&
            ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
             $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
#print "FOO B <$lines[$linenr - 1]>\n";
            $suppress_export{$linenr} = 2;
        }
        if (defined $suppress_export{$linenr} &&
            $suppress_export{$linenr} == 2) {
            WARN("EXPORT_SYMBOL",
                 "EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
        }

# check for global initialisers.
        if ($line =~ /^\+(\s*$Type\s*$Ident\s*(?:\s+$Modifier))*\s*=\s*(0|NULL|false)\s*;/) {
            if (ERROR("GLOBAL_INITIALISERS",
                      "do not initialise globals to 0 or NULL\n" .
                      $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~ s/($Type\s*$Ident\s*(?:\s+$Modifier))*\s*=\s*(0|NULL|false)\s*;/$1;/;
            }
        }
# check for static initialisers.
        if ($line =~ /^\+.*\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
            if (ERROR("INITIALISED_STATIC",
                      "do not initialise statics to 0 or NULL\n" .
                      $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~ s/(\bstatic\s.*?)\s*=\s*(0|NULL|false)\s*;/$1;/;
            }
        }

# check for static const char * arrays.
        if ($line =~ /\bstatic\s+const\s+char\s*\*\s*(\w+)\s*\[\s*\]\s*=\s*/) {
            WARN("STATIC_CONST_CHAR_ARRAY",
                 "static const char * array should probably be static const char * const\n" .
                 $herecurr);
        }

# check for static char foo[] = "bar" declarations.
        if ($line =~ /\bstatic\s+char\s+(\w+)\s*\[\s*\]\s*=\s*"/) {
            WARN("STATIC_CONST_CHAR_ARRAY",
                 "static char array declaration should probably be static const char\n" .
                 $herecurr);
        }

# check for non-global char *foo[] = {"bar", ...} declarations.
        if ($line =~ /^.\s+(?:static\s+|const\s+)?char\s+\*\s*\w+\s*\[\s*\]\s*=\s*\{/) {
            WARN("STATIC_CONST_CHAR_ARRAY",
                 "char * array declaration might be better as static const\n" .
                 $herecurr);
        }

# check for function declarations without arguments like "int foo()"
        if ($line =~ /(\b$Type\s+$Ident)\s*\(\s*\)/) {
            if (ERROR("FUNCTION_WITHOUT_ARGS",
                      "Bad function definition - $1() should probably be $1(void)\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~ s/(\b($Type)\s+($Ident))\s*\(\s*\)/$2 $3(void)/;
            }
        }

# check for new typedefs, only function parameters and sparse annotations
# make sense.
        if ($line =~ /\btypedef\s/ &&
            $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
            $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
            $line !~ /\b$typeTypedefs\b/ &&
            $line !~ /\b__bitwise(?:__|)\b/) {
            WARN("NEW_TYPEDEFS",
                 "do not add new typedefs\n" . $herecurr);
        }

# * goes on variable not on type
        # (char*[ const])
        while ($line =~ m{(\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\))}g) {
            #print "AA<$1>\n";
            my ($ident, $from, $to) = ($1, $2, $2);

            # Should start with a space.
            $to =~ s/^(\S)/ $1/;
            # Should not end with a space.
            $to =~ s/\s+$//;
            # '*'s should not have spaces between.
            while ($to =~ s/\*\s+\*/\*\*/) {
            }

##   print "1: from<$from> to<$to> ident<$ident>\n";
            if ($from ne $to) {
                if (ERROR("POINTER_LOCATION",
                          "\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr) &&
                    $fix) {
                    my $sub_from = $ident;
                    my $sub_to = $ident;
                    $sub_to =~ s/\Q$from\E/$to/;
                    $fixed[$linenr - 1] =~
                        s@\Q$sub_from\E@$sub_to@;
                }
            }
        }
        while ($line =~ m{(\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident))}g) {
            #print "BB<$1>\n";
            my ($match, $from, $to, $ident) = ($1, $2, $2, $3);

            # Should start with a space.
            $to =~ s/^(\S)/ $1/;
            # Should not end with a space.
            $to =~ s/\s+$//;
            # '*'s should not have spaces between.
            while ($to =~ s/\*\s+\*/\*\*/) {
            }
            # Modifiers should have spaces.
            $to =~ s/(\b$Modifier$)/$1 /;

##  print "2: from<$from> to<$to> ident<$ident>\n";
            if ($from ne $to && $ident !~ /^$Modifier$/) {
                if (ERROR("POINTER_LOCATION",
                          "\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr) &&
                    $fix) {

                    my $sub_from = $match;
                    my $sub_to = $match;
                    $sub_to =~ s/\Q$from\E/$to/;
                    $fixed[$linenr - 1] =~
                        s@\Q$sub_from\E@$sub_to@;
                }
            }
        }

# function brace can't be on same line, except for #defines of do while,
# or if closed on same line
        if (($line=~/$Type\s*$Ident\(.*\).*\s{/) and
            !($line=~/\#\s*define.*do\s{/) and !($line=~/}/)) {
            ERROR("OPEN_BRACE",
                  "open brace '{' following function declarations go on the next line\n" . $herecurr);
        }

# open braces for enum, union and struct go on the same line.
        if ($line =~ /^.\s*{/ &&
            $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
            ERROR("OPEN_BRACE",
                  "open brace '{' following $1 go on the same line\n" . $hereprev);
        }

# missing space after union, struct or enum definition
        if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident){1,2}[=\{]/) {
            if (WARN("SPACING",
                     "missing space after $1 definition\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~
                    s/^(.\s*(?:typedef\s+)?(?:enum|union|struct)(?:\s+$Ident){1,2})([=\{])/$1 $2/;
            }
        }

# Function pointer declarations
# check spacing between type, funcptr, and args
# canonical declaration is "type (*funcptr)(args...)"
        if ($line =~ /^.\s*($Declare)\((\s*)\*(\s*)($Ident)(\s*)\)(\s*)\(/) {
            my $declare = $1;
            my $pre_pointer_space = $2;
            my $post_pointer_space = $3;
            my $funcname = $4;
            my $post_funcname_space = $5;
            my $pre_args_space = $6;

# the $Declare variable will capture all spaces after the type
# so check it for a missing trailing missing space but pointer return types
# don't need a space so don't warn for those.
            my $post_declare_space = "";
            if ($declare =~ /(\s+)$/) {
                $post_declare_space = $1;
                $declare = rtrim($declare);
            }
            if ($declare !~ /\*$/ && $post_declare_space =~ /^$/) {
                WARN("SPACING",
                     "missing space after return type\n" . $herecurr);
                $post_declare_space = " ";
            }

# unnecessary space "type ( *funcptr)(args...)"
            if (defined $pre_pointer_space &&
                $pre_pointer_space =~ /^\s/) {
                WARN("SPACING",
                     "Unnecessary space after function pointer open parenthesis\n" . $herecurr);
            }

# unnecessary space "type (* funcptr)(args...)"
            if (defined $post_pointer_space &&
                $post_pointer_space =~ /^\s/) {
                WARN("SPACING",
                     "Unnecessary space before function pointer name\n" . $herecurr);
            }

# unnecessary space "type (*funcptr )(args...)"
            if (defined $post_funcname_space &&
                $post_funcname_space =~ /^\s/) {
                WARN("SPACING",
                     "Unnecessary space after function pointer name\n" . $herecurr);
            }

# unnecessary space "type (*funcptr) (args...)"
            if (defined $pre_args_space &&
                $pre_args_space =~ /^\s/) {
                WARN("SPACING",
                     "Unnecessary space before function pointer arguments\n" . $herecurr);
            }

            if (show_type("SPACING") && $fix) {
                $fixed[$linenr - 1] =~
                    s/^(.\s*)$Declare\s*\(\s*\*\s*$Ident\s*\)\s*\(/$1 . $declare . $post_declare_space . '(*' . $funcname . ')('/ex;
            }
        }

# check for spacing round square brackets; allowed:
#  1. with a type on the left -- int [] a;
#  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
#  3. inside a curly brace -- = { [0...10] = 5 }
        while ($line =~ /(.*?\s)\[/g) {
            my ($where, $prefix) = ($-[1], $1);
            if ($prefix !~ /$Type\s+$/ &&
                ($where != 0 || $prefix !~ /^.\s+$/) &&
                $prefix !~ /[{,]\s+$/) {
                if (ERROR("BRACKET_SPACE",
                          "space prohibited before open square bracket '['\n" . $herecurr) &&
                    $fix) {
                    $fixed[$linenr - 1] =~
                        s/^(\+.*?)\s+\[/$1\[/;
                }
            }
        }

# check for spaces between functions and their parentheses.
        while ($line =~ /($Ident)\s+\(/g) {
            my $name = $1;
            my $ctx_before = substr($line, 0, $-[1]);
            my $ctx = "$ctx_before$name";

            # Ignore those directives where spaces _are_ permitted.
            if ($name =~ /^(?:
                                if|for|while|switch|return|case|
                                volatile|__volatile__|
                                __attribute__|format|__extension__|
                                asm|__asm__)$/x)
            {
                # cpp #define statements have non-optional spaces, ie
                # if there is a space between the name and the open
                # parenthesis it is simply not a parameter group.
            } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {

                # cpp #elif statement condition may start with a (
            } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {

                # If this whole things ends with a type its most
                # likely a typedef for a function.
            } elsif ($ctx =~ /$Type$/) {

            } else {
                if (WARN("SPACING",
                         "space prohibited between function name and open parenthesis '('\n" . $herecurr) &&
                    $fix) {
                    $fixed[$linenr - 1] =~
                        s/\b$name\s+\(/$name\(/;
                }
            }
        }

# Check operator spacing.
        if (!($line=~/\#\s*include/)) {
            my $fixed_line = "";
            my $line_fixed = 0;

            my $ops = qr{
                                <<=|>>=|<=|>=|==|!=|
                                \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
                                =>|->|<<|>>|<|>|=|!|~|
                                &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
                                \?:|\?|:
                        }x;
            my @elements = split(/($ops|;)/, $opline);

##                      print("element count: <" . $#elements . ">\n");
##                      foreach my $el (@elements) {
##                              print("el: <$el>\n");
##                      }

            my @fix_elements = ();
            my $off = 0;

            foreach my $el (@elements) {
                push(@fix_elements, substr($rawline, $off, length($el)));
                $off += length($el);
            }

            $off = 0;

            my $blank = copy_spacing($opline);
            my $last_after = -1;

            for (my $n = 0; $n < $#elements; $n += 2) {

                my $good = $fix_elements[$n] . $fix_elements[$n + 1];

##                              print("n: <$n> good: <$good>\n");

                $off += length($elements[$n]);

                # Pick up the preceding and succeeding characters.
                my $ca = substr($opline, 0, $off);
                my $cc = '';
                if (length($opline) >= ($off + length($elements[$n + 1]))) {
                    $cc = substr($opline, $off + length($elements[$n + 1]));
                }
                my $cb = "$ca$;$cc";

                my $a = '';
                $a = 'V' if ($elements[$n] ne '');
                $a = 'W' if ($elements[$n] =~ /\s$/);
                $a = 'C' if ($elements[$n] =~ /$;$/);
                $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
                $a = 'O' if ($elements[$n] eq '');
                $a = 'E' if ($ca =~ /^\s*$/);

                my $op = $elements[$n + 1];

                my $c = '';
                if (defined $elements[$n + 2]) {
                    $c = 'V' if ($elements[$n + 2] ne '');
                    $c = 'W' if ($elements[$n + 2] =~ /^\s/);
                    $c = 'C' if ($elements[$n + 2] =~ /^$;/);
                    $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
                    $c = 'O' if ($elements[$n + 2] eq '');
                    $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
                } else {
                    $c = 'E';
                }

                my $ctx = "${a}x${c}";

                my $at = "(ctx:$ctx)";

                my $ptr = substr($blank, 0, $off) . "^";
                my $hereptr = "$hereline$ptr\n";

                # Pull out the value of this operator.
                my $op_type = substr($curr_values, $off + 1, 1);

                # Get the full operator variant.
                my $opv = $op . substr($curr_vars, $off, 1);

                # Ignore operators passed as parameters.
                if ($op_type ne 'V' &&
                    $ca =~ /\s$/ && $cc =~ /^\s*,/) {

#                               # Ignore comments
#                               } elsif ($op =~ /^$;+$/) {

                    # ; should have either the end of line or a space or \ after it
                } elsif ($op eq ';') {
                    if ($ctx !~ /.x[WEBC]/ &&
                        $cc !~ /^\\/ && $cc !~ /^;/) {
                        if (ERROR("SPACING",
                                  "space required after that '$op' $at\n" . $hereptr)) {
                            $good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
                            $line_fixed = 1;
                        }
                    }

                    # // is a comment
                } elsif ($op eq '//') {

                    #   :   when part of a bitfield
                } elsif ($opv eq ':B') {
                    # skip the bitfield test for now

                    # No spaces for:
                    #   ->
                } elsif ($op eq '->') {
                    if ($ctx =~ /Wx.|.xW/) {
                        if (ERROR("SPACING",
                                  "spaces prohibited around that '$op' $at\n" . $hereptr)) {
                            $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
                            if (defined $fix_elements[$n + 2]) {
                                $fix_elements[$n + 2] =~ s/^\s+//;
                            }
                            $line_fixed = 1;
                        }
                    }

                    # , must have a space on the right.
                } elsif ($op eq ',') {
                    if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {
                        if (ERROR("SPACING",
                                  "space required after that '$op' $at\n" . $hereptr)) {
                            $good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
                            $line_fixed = 1;
                            $last_after = $n;
                        }
                    }

                    # '*' as part of a type definition -- reported already.
                } elsif ($opv eq '*_') {
                    #warn "'*' is part of type\n";

                    # unary operators should have a space before and
                    # none after.  May be left adjacent to another
                    # unary operator, or a cast
                } elsif ($op eq '!' || $op eq '~' ||
                         $opv eq '*U' || $opv eq '-U' ||
                         $opv eq '&U' || $opv eq '&&U') {
                    if ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
                        if (ERROR("SPACING",
                                  "space required before that '$op' $at\n" . $hereptr)) {
                            if ($n != $last_after + 2) {
                                $good = $fix_elements[$n] . " " . ltrim($fix_elements[$n + 1]);
                                $line_fixed = 1;
                            }
                        }
                    }
                    if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
                        # A unary '*' may be const

                    } elsif ($ctx =~ /.xW/) {
                        if (ERROR("SPACING",
                                  "space prohibited after that '$op' $at\n" . $hereptr)) {
                            $good = $fix_elements[$n] . rtrim($fix_elements[$n + 1]);
                            if (defined $fix_elements[$n + 2]) {
                                $fix_elements[$n + 2] =~ s/^\s+//;
                            }
                            $line_fixed = 1;
                        }
                    }

                    # unary ++ and unary -- are allowed no space on one side.
                } elsif ($op eq '++' or $op eq '--') {
                    if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
                        if (ERROR("SPACING",
                                  "space required one side of that '$op' $at\n" . $hereptr)) {
                            $good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " ";
                            $line_fixed = 1;
                        }
                    }
                    if ($ctx =~ /Wx[BE]/ ||
                        ($ctx =~ /Wx./ && $cc =~ /^;/)) {
                        if (ERROR("SPACING",
                                  "space prohibited before that '$op' $at\n" . $hereptr)) {
                            $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
                            $line_fixed = 1;
                        }
                    }
                    if ($ctx =~ /ExW/) {
                        if (ERROR("SPACING",
                                  "space prohibited after that '$op' $at\n" . $hereptr)) {
                            $good = $fix_elements[$n] . trim($fix_elements[$n + 1]);
                            if (defined $fix_elements[$n + 2]) {
                                $fix_elements[$n + 2] =~ s/^\s+//;
                            }
                            $line_fixed = 1;
                        }
                    }

                    # << and >> may either have or not have spaces both sides
                } elsif ($op eq '<<' or $op eq '>>' or
                         $op eq '&' or $op eq '^' or $op eq '|' or
                         $op eq '+' or $op eq '-' or
                         $op eq '*' or $op eq '/' or
                         $op eq '%')
                {
                    if ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
                        if (ERROR("SPACING",
                                  "need consistent spacing around '$op' $at\n" . $hereptr)) {
                            $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
                            if (defined $fix_elements[$n + 2]) {
                                $fix_elements[$n + 2] =~ s/^\s+//;
                            }
                            $line_fixed = 1;
                        }
                    }

                    # A colon needs no spaces before when it is
                    # terminating a case value or a label.
                } elsif ($opv eq ':C' || $opv eq ':L') {
                    if ($ctx =~ /Wx./) {
                        if (ERROR("SPACING",
                                  "space prohibited before that '$op' $at\n" . $hereptr)) {
                            $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
                            $line_fixed = 1;
                        }
                    }

                    # All the others need spaces both sides.
                } elsif ($ctx !~ /[EWC]x[CWE]/) {
                    my $ok = 0;

                    # Ignore email addresses <foo@bar>
                    if (($op eq '<' &&
                         $cc =~ /^\S+\@\S+>/) ||
                        ($op eq '>' &&
                         $ca =~ /<\S+\@\S+$/))
                    {
                        $ok = 1;
                    }

                    # messages are ERROR, but ?: are CHK
                    if ($ok == 0) {
                        my $msg_type = \&ERROR;
                        $msg_type = \&CHK if (($op eq '?:' || $op eq '?' || $op eq ':') && $ctx =~ /VxV/);

                        if (&{$msg_type}("SPACING",
                                         "spaces required around that '$op' $at\n" . $hereptr)) {
                            $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
                            if (defined $fix_elements[$n + 2]) {
                                $fix_elements[$n + 2] =~ s/^\s+//;
                            }
                            $line_fixed = 1;
                        }
                    }
                }
                $off += length($elements[$n + 1]);

##                              print("n: <$n> GOOD: <$good>\n");

                $fixed_line = $fixed_line . $good;
            }

            if (($#elements % 2) == 0) {
                $fixed_line = $fixed_line . $fix_elements[$#elements];
            }

            if ($fix && $line_fixed && $fixed_line ne $fixed[$linenr - 1]) {
                $fixed[$linenr - 1] = $fixed_line;
            }


        }

# check for whitespace before a non-naked semicolon
        if ($line =~ /^\+.*\S\s+;\s*$/) {
            if (WARN("SPACING",
                     "space prohibited before semicolon\n" . $herecurr) &&
                $fix) {
                1 while $fixed[$linenr - 1] =~
                    s/^(\+.*\S)\s+;/$1;/;
            }
        }

# check for multiple assignments
        if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
            CHK("MULTIPLE_ASSIGNMENTS",
                "multiple assignments should be avoided\n" . $herecurr);
        }

## # check for multiple declarations, allowing for a function declaration
## # continuation.
##              if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
##                  $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
##
##                      # Remove any bracketed sections to ensure we do not
##                      # falsly report the parameters of functions.
##                      my $ln = $line;
##                      while ($ln =~ s/\([^\(\)]*\)//g) {
##                      }
##                      if ($ln =~ /,/) {
##                              WARN("MULTIPLE_DECLARATION",
##                                   "declaring multiple variables together should be avoided\n" . $herecurr);
##                      }
##              }

#need space before brace following if, while, etc
        if (($line =~ /\(.*\){/ && $line !~ /\($Type\){/) ||
            $line =~ /do{/) {
            if (ERROR("SPACING",
                      "space required before the open brace '{'\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~ s/^(\+.*(?:do|\))){/$1 {/;
            }
        }

## # check for blank lines before declarations
##              if ($line =~ /^.\t+$Type\s+$Ident(?:\s*=.*)?;/ &&
##                  $prevrawline =~ /^.\s*$/) {
##                      WARN("SPACING",
##                           "No blank lines before declarations\n" . $hereprev);
##              }
##

# closing brace should have a space following it when it has anything
# on the line
        if ($line =~ /}(?!(?:,|;|\)))\S/) {
            if (ERROR("SPACING",
                      "space required after that close brace '}'\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~
                    s/}((?!(?:,|;|\)))\S)/} $1/;
            }
        }

# check spacing on square brackets
        if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
            if (ERROR("SPACING",
                      "space prohibited after that open square bracket '['\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~
                    s/\[\s+/\[/;
            }
        }
        if ($line =~ /\s\]/) {
            if (ERROR("SPACING",
                      "space prohibited before that close square bracket ']'\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~
                    s/\s+\]/\]/;
            }
        }

# check spacing on parentheses
        if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
            $line !~ /for\s*\(\s+;/) {
            if (ERROR("SPACING",
                      "space prohibited after that open parenthesis '('\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~
                    s/\(\s+/\(/;
            }
        }
        if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
            $line !~ /for\s*\(.*;\s+\)/ &&
            $line !~ /:\s+\)/) {
            if (ERROR("SPACING",
                      "space prohibited before that close parenthesis ')'\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~
                    s/\s+\)/\)/;
            }
        }

#goto labels aren't indented, allow a single space however
        if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
            !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
            if (WARN("INDENTED_LABEL",
                     "labels should not be indented\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~
                    s/^(.)\s+/$1/;
            }
        }

# return is not a function
        if (defined($stat) && $stat =~ /^.\s*return(\s*)\(/s) {
            my $spacing = $1;
            if ($^V && $^V ge 5.10.0 &&
                $stat =~ /^.\s*return\s*($balanced_parens)\s*;\s*$/) {
                my $value = $1;
                $value = deparenthesize($value);
                if ($value =~ m/^\s*$FuncArg\s*(?:\?|$)/) {
                    ERROR("RETURN_PARENTHESES",
                          "return is not a function, parentheses are not required\n" . $herecurr);
                }
            } elsif ($spacing !~ /\s+/) {
                ERROR("SPACING",
                      "space required before the open parenthesis '('\n" . $herecurr);
            }
        }

# unnecessary return in a void function
# at end-of-function, with the previous line a single leading tab, then return;
# and the line before that not a goto label target like "out:"
        if ($sline =~ /^[ \+]}\s*$/ &&
            $prevline =~ /^\+\treturn\s*;\s*$/ &&
            $linenr >= 3 &&
            $lines[$linenr - 3] =~ /^[ +]/ &&
            $lines[$linenr - 3] !~ /^[ +]\s*$Ident\s*:/) {
            WARN("RETURN_VOID",
                 "void function return statements are not generally useful\n" . $hereprev);
        }

# if statements using unnecessary parentheses - ie: if ((foo == bar))
        if ($^V && $^V ge 5.10.0 &&
            $line =~ /\bif\s*((?:\(\s*){2,})/) {
            my $openparens = $1;
            my $count = $openparens =~ tr@\(@\(@;
            my $msg = "";
            if ($line =~ /\bif\s*(?:\(\s*){$count,$count}$LvalOrFunc\s*($Compare)\s*$LvalOrFunc(?:\s*\)){$count,$count}/) {
                my $comp = $4;  #Not $1 because of $LvalOrFunc
                $msg = " - maybe == should be = ?" if ($comp eq "==");
                WARN("UNNECESSARY_PARENTHESES",
                     "Unnecessary parentheses$msg\n" . $herecurr);
            }
        }

# Return of what appears to be an errno should normally be -'ve
        if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
            my $name = $1;
            if ($name ne 'EOF' && $name ne 'ERROR') {
                WARN("USE_NEGATIVE_ERRNO",
                     "return of an errno should typically be -ve (return -$1)\n" . $herecurr);
            }
        }

# Need a space before open parenthesis after if, while etc
        if ($line =~ /\b(if|while|for|switch)\(/) {
            if (ERROR("SPACING",
                      "space required before the open parenthesis '('\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~
                    s/\b(if|while|for|switch)\(/$1 \(/;
            }
        }

# Check for illegal assignment in if conditional -- and check for trailing
# statements after the conditional.
        if ($line =~ /do\s*(?!{)/) {
            ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
                ctx_statement_block($linenr, $realcnt, 0)
                if (!defined $stat);
            my ($stat_next) = ctx_statement_block($line_nr_next,
                                                  $remain_next, $off_next);
            $stat_next =~ s/\n./\n /g;
            ##print "stat<$stat> stat_next<$stat_next>\n";

            if ($stat_next =~ /^\s*while\b/) {
                # If the statement carries leading newlines,
                # then count those as offsets.
                my ($whitespace) =
                    ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
                my $offset =
                    statement_rawlines($whitespace) - 1;

                $suppress_whiletrailers{$line_nr_next +
                                            $offset} = 1;
            }
        }
        if (!defined $suppress_whiletrailers{$linenr} &&
            defined($stat) && defined($cond) &&
            $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
            my ($s, $c) = ($stat, $cond);

            if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
                ERROR("ASSIGN_IN_IF",
                      "do not use assignment in if condition\n" . $herecurr);
            }

            # Find out what is on the end of the line after the
            # conditional.
            substr($s, 0, length($c), '');
            $s =~ s/\n.*//g;
            $s =~ s/$;//g;      # Remove any comments
            if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
                $c !~ /}\s*while\s*/)
            {
                # Find out how long the conditional actually is.
                my @newlines = ($c =~ /\n/gs);
                my $cond_lines = 1 + $#newlines;
                my $stat_real = '';

                $stat_real = raw_line($linenr, $cond_lines)
                    . "\n" if ($cond_lines);
                if (defined($stat_real) && $cond_lines > 1) {
                    $stat_real = "[...]\n$stat_real";
                }

                ERROR("TRAILING_STATEMENTS",
                      "trailing statements should be on next line\n" . $herecurr . $stat_real);
            }
        }

# Check for bitwise tests written as boolean
        if ($line =~ /
                        (?:
                                (?:\[|\(|\&\&|\|\|)
                                \s*0[xX][0-9]+\s*
                                (?:\&\&|\|\|)
                        |
                                (?:\&\&|\|\|)
                                \s*0[xX][0-9]+\s*
                                (?:\&\&|\|\||\)|\])
                        )/x)
        {
            WARN("HEXADECIMAL_BOOLEAN_TEST",
                 "boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
        }

# if and else should not have general statements after it
        if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
            my $s = $1;
            $s =~ s/$;//g;      # Remove any comments
            if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
                ERROR("TRAILING_STATEMENTS",
                      "trailing statements should be on next line\n" . $herecurr);
            }
        }
# if should not continue a brace
        if ($line =~ /}\s*if\b/) {
            ERROR("TRAILING_STATEMENTS",
                  "trailing statements should be on next line\n" .
                  $herecurr);
        }
# case and default should not have general statements after them
        if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
            $line !~ /\G(?:
                        (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
                        \s*return\s+
                    )/xg)
        {
            ERROR("TRAILING_STATEMENTS",
                  "trailing statements should be on next line\n" . $herecurr);
        }

        # Check for }<nl>else {, these must be at the same
        # indent level to be relevant to each other.
        if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
            $previndent == $indent) {
            ERROR("ELSE_AFTER_BRACE",
                  "else should follow close brace '}'\n" . $hereprev);
        }

        if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and
            $previndent == $indent) {
            my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);

            # Find out what is on the end of the line after the
            # conditional.
            substr($s, 0, length($c), '');
            $s =~ s/\n.*//g;

            if ($s =~ /^\s*;/) {
                ERROR("WHILE_AFTER_BRACE",
                      "while should follow close brace '}'\n" . $hereprev);
            }
        }

#Specific variable tests
        while ($line =~ m{($Constant|$Lval)}g) {
            my $var = $1;

#gcc binary extension
            if ($var =~ /^$Binary$/) {
                if (WARN("GCC_BINARY_CONSTANT",
                         "Avoid gcc v4.3+ binary constant extension: <$var>\n" . $herecurr) &&
                    $fix) {
                    my $hexval = sprintf("0x%x", oct($var));
                    $fixed[$linenr - 1] =~
                        s/\b$var\b/$hexval/;
                }
            }

#CamelCase
            if ($var !~ /^$Constant$/ &&
                $var =~ /[A-Z][a-z]|[a-z][A-Z]/ &&
#Ignore Page<foo> variants
                $var !~ /^(?:Clear|Set|TestClear|TestSet|)Page[A-Z]/ &&
#Ignore SI style variants like nS, mV and dB (ie: max_uV, regulator_min_uA_show)
                $var !~ /^(?:[a-z_]*?)_?[a-z][A-Z](?:_[a-z_]+)?$/) {
                while ($var =~ m{($Ident)}g) {
                    my $word = $1;
                    next if ($word !~ /[A-Z][a-z]|[a-z][A-Z]/);
                    if ($check) {
                        seed_camelcase_includes();
                        if (!$file && !$camelcase_file_seeded) {
                            seed_camelcase_file($realfile);
                            $camelcase_file_seeded = 1;
                        }
                    }
                    if (!defined $camelcase{$word}) {
                        $camelcase{$word} = 1;
                        CHK("CAMELCASE",
                            "Avoid CamelCase: <$word>\n" . $herecurr);
                    }
                }
            }
        }

#no spaces allowed after \ in define
        if ($line =~ /\#\s*define.*\\\s+$/) {
            if (WARN("WHITESPACE_AFTER_LINE_CONTINUATION",
                     "Whitespace after \\ makes next lines useless\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~ s/\s+$//;
            }
        }

#warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
        if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
            my $file = "$1.h";
            my $checkfile = "include/linux/$file";
            if (-f "$root/$checkfile" &&
                $realfile ne $checkfile &&
                $1 !~ /$allowed_asm_includes/)
            {
                if ($realfile =~ m{^arch/}) {
                    CHK("ARCH_INCLUDE_LINUX",
                        "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
                } else {
                    WARN("INCLUDE_LINUX",
                         "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
                }
            }
        }

# multi-statement macros should be enclosed in a do while loop, grab the
# first statement and ensure its the whole macro if its not enclosed
# in a known good container
        if ($realfile !~ m@/vmlinux.lds.h$@ &&
            $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
            my $ln = $linenr;
            my $cnt = $realcnt;
            my ($off, $dstat, $dcond, $rest);
            my $ctx = '';
            ($dstat, $dcond, $ln, $cnt, $off) =
                ctx_statement_block($linenr, $realcnt, 0);
            $ctx = $dstat;
            #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
            #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";

            $dstat =~ s/^.\s*\#\s*define\s+$Ident(?:\([^\)]*\))?\s*//;
            $dstat =~ s/$;//g;
            $dstat =~ s/\\\n.//g;
            $dstat =~ s/^\s*//s;
            $dstat =~ s/\s*$//s;

            # Flatten any parentheses and braces
            while ($dstat =~ s/\([^\(\)]*\)/1/ ||
                   $dstat =~ s/\{[^\{\}]*\}/1/ ||
                   $dstat =~ s/\[[^\[\]]*\]/1/)
            {
            }

            # Flatten any obvious string concatentation.
            while ($dstat =~ s/("X*")\s*$Ident/$1/ ||
                   $dstat =~ s/$Ident\s*("X*")/$1/)
            {
            }

            my $exceptions = qr{
                                $Declare|
                                module_param_named|
                                MODULE_PARM_DESC|
                                DECLARE_PER_CPU|
                                DEFINE_PER_CPU|
                                __typeof__\(|
                                union|
                                struct|
                                \.$Ident\s*=\s*|
                                ^\"|\"$
                        }x;
            #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
            if ($dstat ne '' &&
                $dstat !~ /^(?:$Ident|-?$Constant),$/ &&                        # 10, // foo(),
                $dstat !~ /^(?:$Ident|-?$Constant);$/ &&                        # foo();
                $dstat !~ /^[!~-]?(?:$Lval|$Constant)$/ &&              # 10 // foo() // !foo // ~foo // -foo // foo->bar // foo.bar->baz
                $dstat !~ /^'X'$/ &&                                    # character constants
                $dstat !~ /$exceptions/ &&
                $dstat !~ /^\.$Ident\s*=/ &&                            # .foo =
                $dstat !~ /^(?:\#\s*$Ident|\#\s*$Constant)\s*$/ &&              # stringification #foo
                $dstat !~ /^do\s*$Constant\s*while\s*$Constant;?$/ &&   # do {...} while (...); // do {...} while (...)
                $dstat !~ /^for\s*$Constant$/ &&                                # for (...)
                $dstat !~ /^for\s*$Constant\s+(?:$Ident|-?$Constant)$/ &&       # for (...) bar()
                $dstat !~ /^do\s*{/ &&                                  # do {...
                $dstat !~ /^\({/ &&                                             # ({...
                $ctx !~ /^.\s*#\s*define\s+TRACE_(?:SYSTEM|INCLUDE_FILE|INCLUDE_PATH)\b/)
            {
                $ctx =~ s/\n*$//;
                my $herectx = $here . "\n";
                my $cnt = statement_rawlines($ctx);

                for (my $n = 0; $n < $cnt; $n++) {
                    $herectx .= raw_line($linenr, $n) . "\n";
                }

                if ($dstat =~ /;/) {
                    ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
                          "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx");
                } else {
                    ERROR("COMPLEX_MACRO",
                          "Macros with complex values should be enclosed in parenthesis\n" . "$herectx");
                }
            }

# check for line continuations outside of #defines, preprocessor #, and asm

        } else {
            if ($prevline !~ /^..*\\$/ &&
                $line !~ /^\+\s*\#.*\\$/ &&             # preprocessor
                $line !~ /^\+.*\b(__asm__|asm)\b.*\\$/ &&       # asm
                $line =~ /^\+.*\\$/) {
                WARN("LINE_CONTINUATIONS",
                     "Avoid unnecessary line continuations\n" . $herecurr);
            }
        }

# do {} while (0) macro tests:
# single-statement macros do not need to be enclosed in do while (0) loop,
# macro should not end with a semicolon
        if ($^V && $^V ge 5.10.0 &&
            $realfile !~ m@/vmlinux.lds.h$@ &&
            $line =~ /^.\s*\#\s*define\s+$Ident(\()?/) {
            my $ln = $linenr;
            my $cnt = $realcnt;
            my ($off, $dstat, $dcond, $rest);
            my $ctx = '';
            ($dstat, $dcond, $ln, $cnt, $off) =
                ctx_statement_block($linenr, $realcnt, 0);
            $ctx = $dstat;

            $dstat =~ s/\\\n.//g;

            if ($dstat =~ /^\+\s*#\s*define\s+$Ident\s*${balanced_parens}\s*do\s*{(.*)\s*}\s*while\s*\(\s*0\s*\)\s*([;\s]*)\s*$/) {
                my $stmts = $2;
                my $semis = $3;

                $ctx =~ s/\n*$//;
                my $cnt = statement_rawlines($ctx);
                my $herectx = $here . "\n";

                for (my $n = 0; $n < $cnt; $n++) {
                    $herectx .= raw_line($linenr, $n) . "\n";
                }

                if (($stmts =~ tr/;/;/) == 1 &&
                    $stmts !~ /^\s*(if|while|for|switch)\b/) {
                    WARN("SINGLE_STATEMENT_DO_WHILE_MACRO",
                         "Single statement macros should not use a do {} while (0) loop\n" . "$herectx");
                }
                if (defined $semis && $semis ne "") {
                    WARN("DO_WHILE_MACRO_WITH_TRAILING_SEMICOLON",
                         "do {} while (0) macros should not be semicolon terminated\n" . "$herectx");
                }
            } elsif ($dstat =~ /^\+\s*#\s*define\s+$Ident.*;\s*$/) {
                $ctx =~ s/\n*$//;
                my $cnt = statement_rawlines($ctx);
                my $herectx = $here . "\n";

                for (my $n = 0; $n < $cnt; $n++) {
                    $herectx .= raw_line($linenr, $n) . "\n";
                }

                WARN("TRAILING_SEMICOLON",
                     "macros should not use a trailing semicolon\n" . "$herectx");
            }
        }

# make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
# all assignments may have only one of the following with an assignment:
#       .
#       ALIGN(...)
#       VMLINUX_SYMBOL(...)
        if ($realfile eq 'vmlinux.lds.h' && $line =~ /(?:(?:^|\s)$Ident\s*=|=\s*$Ident(?:\s|$))/) {
            WARN("MISSING_VMLINUX_SYMBOL",
                 "vmlinux.lds.h needs VMLINUX_SYMBOL() around C-visible symbols\n" . $herecurr);
        }

# check for redundant bracing round if etc
        if ($line =~ /(^.*)\bif\b/ && $1 !~ /else\s*$/) {
            my ($level, $endln, @chunks) =
                ctx_statement_full($linenr, $realcnt, 1);
            #print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
            #print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
            if ($#chunks > 0 && $level == 0) {
                my @allowed = ();
                my $allow = 0;
                my $seen = 0;
                my $herectx = $here . "\n";
                my $ln = $linenr - 1;
                for my $chunk (@chunks) {
                    my ($cond, $block) = @{$chunk};

                    # If the condition carries leading newlines, then count those as offsets.
                    my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
                    my $offset = statement_rawlines($whitespace) - 1;

                    $allowed[$allow] = 0;
                    #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";

                    # We have looked at and allowed this specific line.
                    $suppress_ifbraces{$ln + $offset} = 1;

                    $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
                    $ln += statement_rawlines($block) - 1;

                    substr($block, 0, length($cond), '');

                    $seen++ if ($block =~ /^\s*{/);

                    #print "cond<$cond> block<$block> allowed<$allowed[$allow]>\n";
                    if (statement_lines($cond) > 1) {
                        #print "APW: ALLOWED: cond<$cond>\n";
                        $allowed[$allow] = 1;
                    }
                    if ($block =~/\b(?:if|for|while)\b/) {
                        #print "APW: ALLOWED: block<$block>\n";
                        $allowed[$allow] = 1;
                    }
                    if (statement_block_size($block) > 1) {
                        #print "APW: ALLOWED: lines block<$block>\n";
                        $allowed[$allow] = 1;
                    }
                    $allow++;
                }
                if ($seen) {
                    my $sum_allowed = 0;
                    foreach (@allowed) {
                        $sum_allowed += $_;
                    }
                    if ($sum_allowed == 0) {
                        WARN("BRACES",
                             "braces {} are not necessary for any arm of this statement\n" . $herectx);
                    } elsif ($sum_allowed != $allow &&
                             $seen != $allow) {
                        CHK("BRACES",
                            "braces {} should be used on all arms of this statement\n" . $herectx);
                    }
                }
            }
        }
        if (!defined $suppress_ifbraces{$linenr - 1} &&
            $line =~ /\b(if|while|for|else)\b/) {
            my $allowed = 0;

            # Check the pre-context.
            if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
                #print "APW: ALLOWED: pre<$1>\n";
                $allowed = 1;
            }

            my ($level, $endln, @chunks) =
                ctx_statement_full($linenr, $realcnt, $-[0]);

            # Check the condition.
            my ($cond, $block) = @{$chunks[0]};
            #print "CHECKING<$linenr> cond<$cond> block<$block>\n";
            if (defined $cond) {
                substr($block, 0, length($cond), '');
            }
            if (statement_lines($cond) > 1) {
                #print "APW: ALLOWED: cond<$cond>\n";
                $allowed = 1;
            }
            if ($block =~/\b(?:if|for|while)\b/) {
                #print "APW: ALLOWED: block<$block>\n";
                $allowed = 1;
            }
            if (statement_block_size($block) > 1) {
                #print "APW: ALLOWED: lines block<$block>\n";
                $allowed = 1;
            }
            # Check the post-context.
            if (defined $chunks[1]) {
                my ($cond, $block) = @{$chunks[1]};
                if (defined $cond) {
                    substr($block, 0, length($cond), '');
                }
                if ($block =~ /^\s*\{/) {
                    #print "APW: ALLOWED: chunk-1 block<$block>\n";
                    $allowed = 1;
                }
            }
            if ($level == 0 && $block =~ /^\s*\{/ && !$allowed) {
                my $herectx = $here . "\n";
                my $cnt = statement_rawlines($block);

                for (my $n = 0; $n < $cnt; $n++) {
                    $herectx .= raw_line($linenr, $n) . "\n";
                }

                WARN("BRACES",
                     "braces {} are not necessary for single statement blocks\n" . $herectx);
            }
        }

# check for unnecessary blank lines around braces
        if (($line =~ /^.\s*}\s*$/ && $prevrawline =~ /^.\s*$/)) {
            CHK("BRACES",
                "Blank lines aren't necessary before a close brace '}'\n" . $hereprev);
        }
        if (($rawline =~ /^.\s*$/ && $prevline =~ /^..*{\s*$/)) {
            CHK("BRACES",
                "Blank lines aren't necessary after an open brace '{'\n" . $hereprev);
        }

# no volatiles please
        my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
        if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
            WARN("VOLATILE",
                 "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
        }

# warn about #if 0
        if ($line =~ /^.\s*\#\s*if\s+0\b/) {
            CHK("REDUNDANT_CODE",
                "if this code is redundant consider removing it\n" .
                $herecurr);
        }

# check for needless "if (<foo>) fn(<foo>)" uses
        if ($prevline =~ /\bif\s*\(\s*($Lval)\s*\)/) {
            my $expr = '\s*\(\s*' . quotemeta($1) . '\s*\)\s*;';
            if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?)$expr/) {
                WARN('NEEDLESS_IF',
                     "$1(NULL) is safe this check is probably not required\n" . $hereprev);
            }
        }

# check for bad placement of section $InitAttribute (e.g.: __initdata)
        if ($line =~ /(\b$InitAttribute\b)/) {
            my $attr = $1;
            if ($line =~ /^\+\s*static\s+(?:const\s+)?(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*[=;]/) {
                my $ptr = $1;
                my $var = $2;
                if ((($ptr =~ /\b(union|struct)\s+$attr\b/ &&
                      ERROR("MISPLACED_INIT",
                            "$attr should be placed after $var\n" . $herecurr)) ||
                     ($ptr !~ /\b(union|struct)\s+$attr\b/ &&
                      WARN("MISPLACED_INIT",
                           "$attr should be placed after $var\n" . $herecurr))) &&
                    $fix) {
                    $fixed[$linenr - 1] =~ s/(\bstatic\s+(?:const\s+)?)(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*([=;])\s*/"$1" . trim(string_find_replace($2, "\\s*$attr\\s*", " ")) . " " . trim(string_find_replace($3, "\\s*$attr\\s*", "")) . " $attr" . ("$4" eq ";" ? ";" : " = ")/e;
                }
            }
        }

# check for $InitAttributeData (ie: __initdata) with const
        if ($line =~ /\bconst\b/ && $line =~ /($InitAttributeData)/) {
            my $attr = $1;
            $attr =~ /($InitAttributePrefix)(.*)/;
            my $attr_prefix = $1;
            my $attr_type = $2;
            if (ERROR("INIT_ATTRIBUTE",
                      "Use of const init definition must use ${attr_prefix}initconst\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~
                    s/$InitAttributeData/${attr_prefix}initconst/;
            }
        }

# check for $InitAttributeConst (ie: __initconst) without const
        if ($line !~ /\bconst\b/ && $line =~ /($InitAttributeConst)/) {
            my $attr = $1;
            if (ERROR("INIT_ATTRIBUTE",
                      "Use of $attr requires a separate use of const\n" . $herecurr) &&
                $fix) {
                my $lead = $fixed[$linenr - 1] =~
                    /(^\+\s*(?:static\s+))/;
                $lead = rtrim($1);
                $lead = "$lead " if ($lead !~ /^\+$/);
                $lead = "${lead}const ";
                $fixed[$linenr - 1] =~ s/(^\+\s*(?:static\s+))/$lead/;
            }
        }

# don't use __constant_<foo> functions outside of include/uapi/
        if ($realfile !~ m@^include/uapi/@ &&
            $line =~ /(__constant_(?:htons|ntohs|[bl]e(?:16|32|64)_to_cpu|cpu_to_[bl]e(?:16|32|64)))\s*\(/) {
            my $constant_func = $1;
            my $func = $constant_func;
            $func =~ s/^__constant_//;
            if (WARN("CONSTANT_CONVERSION",
                     "$constant_func should be $func\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~ s/\b$constant_func\b/$func/g;
            }
        }

# prefer usleep_range over udelay
        if ($line =~ /\budelay\s*\(\s*(\d+)\s*\)/) {
            my $delay = $1;
            # ignore udelay's < 10, however
            if (! ($delay < 10) ) {
                CHK("USLEEP_RANGE",
                    "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $herecurr);
            }
            if ($delay > 2000) {
                WARN("LONG_UDELAY",
                     "long udelay - prefer mdelay; see arch/arm/include/asm/delay.h\n" . $herecurr);
            }
        }

# warn about unexpectedly long msleep's
        if ($line =~ /\bmsleep\s*\((\d+)\);/) {
            if ($1 < 20) {
                WARN("MSLEEP",
                     "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $herecurr);
            }
        }

# check for comparisons of jiffies
        if ($line =~ /\bjiffies\s*$Compare|$Compare\s*jiffies\b/) {
            WARN("JIFFIES_COMPARISON",
                 "Comparing jiffies is almost always wrong; prefer time_after, time_before and friends\n" . $herecurr);
        }

# check for comparisons of get_jiffies_64()
        if ($line =~ /\bget_jiffies_64\s*\(\s*\)\s*$Compare|$Compare\s*get_jiffies_64\s*\(\s*\)/) {
            WARN("JIFFIES_COMPARISON",
                 "Comparing get_jiffies_64() is almost always wrong; prefer time_after64, time_before64 and friends\n" . $herecurr);
        }

# warn about spacing in #ifdefs
        if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
            if (ERROR("SPACING",
                      "exactly one space required after that #$1\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~
                    s/^(.\s*\#\s*(ifdef|ifndef|elif))\s{2,}/$1 /;
            }

        }

# check for spinlock_t definitions without a comment.
        if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
            $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
            my $which = $1;
            if (!ctx_has_comment($first_line, $linenr)) {
                CHK("UNCOMMENTED_DEFINITION",
                    "$1 definition without comment\n" . $herecurr);
            }
        }
# check for memory barriers without a comment.
        if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
            if (!ctx_has_comment($first_line, $linenr)) {
                WARN("MEMORY_BARRIER",
                     "memory barrier without comment\n" . $herecurr);
            }
        }
# check of hardware specific defines
        if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
            CHK("ARCH_DEFINES",
                "architecture specific defines should be avoided\n" .  $herecurr);
        }

# Check that the storage class is at the beginning of a declaration
        if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
            WARN("STORAGE_CLASS",
                 "storage class should be at the beginning of the declaration\n" . $herecurr)
        }

# check the location of the inline attribute, that it is between
# storage class and type.
        if ($line =~ /\b$Type\s+$Inline\b/ ||
            $line =~ /\b$Inline\s+$Storage\b/) {
            ERROR("INLINE_LOCATION",
                  "inline keyword should sit between storage class and type\n" . $herecurr);
        }

# Check for __inline__ and __inline, prefer inline
        if ($realfile !~ m@\binclude/uapi/@ &&
            $line =~ /\b(__inline__|__inline)\b/) {
            if (WARN("INLINE",
                     "plain inline is preferred over $1\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~ s/\b(__inline__|__inline)\b/inline/;

            }
        }

# Check for __attribute__ packed, prefer __packed
        if ($realfile !~ m@\binclude/uapi/@ &&
            $line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
            WARN("PREFER_PACKED",
                 "__packed is preferred over __attribute__((packed))\n" . $herecurr);
        }

# Check for __attribute__ aligned, prefer __aligned
        if ($realfile !~ m@\binclude/uapi/@ &&
            $line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
            WARN("PREFER_ALIGNED",
                 "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
        }

# Check for __attribute__ format(printf, prefer __printf
        if ($realfile !~ m@\binclude/uapi/@ &&
            $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf/) {
            if (WARN("PREFER_PRINTF",
                     "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf\s*,\s*(.*)\)\s*\)\s*\)/"__printf(" . trim($1) . ")"/ex;

            }
        }

# Check for __attribute__ format(scanf, prefer __scanf
        if ($realfile !~ m@\binclude/uapi/@ &&
            $line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\b/) {
            if (WARN("PREFER_SCANF",
                     "__scanf(string-index, first-to-check) is preferred over __attribute__((format(scanf, string-index, first-to-check)))\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\s*,\s*(.*)\)\s*\)\s*\)/"__scanf(" . trim($1) . ")"/ex;
            }
        }

# check for sizeof(&)
        if ($line =~ /\bsizeof\s*\(\s*\&/) {
            WARN("SIZEOF_ADDRESS",
                 "sizeof(& should be avoided\n" . $herecurr);
        }

# check for sizeof without parenthesis
        if ($line =~ /\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/) {
            if (WARN("SIZEOF_PARENTHESIS",
                     "sizeof $1 should be sizeof($1)\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~ s/\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/"sizeof(" . trim($1) . ")"/ex;
            }
        }

# check for line continuations in quoted strings with odd counts of "
        if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
            WARN("LINE_CONTINUATIONS",
                 "Avoid line continuations in quoted strings\n" . $herecurr);
        }

# check for struct spinlock declarations
        if ($line =~ /^.\s*\bstruct\s+spinlock\s+\w+\s*;/) {
            WARN("USE_SPINLOCK_T",
                 "struct spinlock should be spinlock_t\n" . $herecurr);
        }

# check for seq_printf uses that could be seq_puts
        if ($sline =~ /\bseq_printf\s*\(.*"\s*\)\s*;\s*$/) {
            my $fmt = get_quoted_string($line, $rawline);
            if ($fmt ne "" && $fmt !~ /[^\\]\%/) {
                if (WARN("PREFER_SEQ_PUTS",
                         "Prefer seq_puts to seq_printf\n" . $herecurr) &&
                    $fix) {
                    $fixed[$linenr - 1] =~ s/\bseq_printf\b/seq_puts/;
                }
            }
        }

# Check for misused memsets
        if ($^V && $^V ge 5.10.0 &&
            defined $stat &&
            $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/s) {

            my $ms_addr = $2;
            my $ms_val = $7;
            my $ms_size = $12;

            if ($ms_size =~ /^(0x|)0$/i) {
                ERROR("MEMSET",
                      "memset to 0's uses 0 as the 2nd argument, not the 3rd\n" . "$here\n$stat\n");
            } elsif ($ms_size =~ /^(0x|)1$/i) {
                WARN("MEMSET",
                     "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . "$here\n$stat\n");
            }
        }

# typecasts on min/max could be min_t/max_t
        if ($^V && $^V ge 5.10.0 &&
            defined $stat &&
            $stat =~ /^\+(?:.*?)\b(min|max)\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
            if (defined $2 || defined $7) {
                my $call = $1;
                my $cast1 = deparenthesize($2);
                my $arg1 = $3;
                my $cast2 = deparenthesize($7);
                my $arg2 = $8;
                my $cast;

                if ($cast1 ne "" && $cast2 ne "" && $cast1 ne $cast2) {
                    $cast = "$cast1 or $cast2";
                } elsif ($cast1 ne "") {
                    $cast = $cast1;
                } else {
                    $cast = $cast2;
                }
                WARN("MINMAX",
                     "$call() should probably be ${call}_t($cast, $arg1, $arg2)\n" . "$here\n$stat\n");
            }
        }

# check usleep_range arguments
        if ($^V && $^V ge 5.10.0 &&
            defined $stat &&
            $stat =~ /^\+(?:.*?)\busleep_range\s*\(\s*($FuncArg)\s*,\s*($FuncArg)\s*\)/) {
            my $min = $1;
            my $max = $7;
            if ($min eq $max) {
                WARN("USLEEP_RANGE",
                     "usleep_range should not use min == max args; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
            } elsif ($min =~ /^\d+$/ && $max =~ /^\d+$/ &&
                     $min > $max) {
                WARN("USLEEP_RANGE",
                     "usleep_range args reversed, use min then max; see Documentation/timers/timers-howto.txt\n" . "$here\n$stat\n");
            }
        }

# check for naked sscanf
        if ($^V && $^V ge 5.10.0 &&
            defined $stat &&
            $line =~ /\bsscanf\b/ &&
            ($stat !~ /$Ident\s*=\s*sscanf\s*$balanced_parens/ &&
             $stat !~ /\bsscanf\s*$balanced_parens\s*(?:$Compare)/ &&
             $stat !~ /(?:$Compare)\s*\bsscanf\s*$balanced_parens/)) {
            my $lc = $stat =~ tr@\n@@;
            $lc = $lc + $linenr;
            my $stat_real = raw_line($linenr, 0);
            for (my $count = $linenr + 1; $count <= $lc; $count++) {
                $stat_real = $stat_real . "\n" . raw_line($count, 0);
            }
            WARN("NAKED_SSCANF",
                 "unchecked sscanf return value\n" . "$here\n$stat_real\n");
        }

# check for simple sscanf that should be kstrto<foo>
        if ($^V && $^V ge 5.10.0 &&
            defined $stat &&
            $line =~ /\bsscanf\b/) {
            my $lc = $stat =~ tr@\n@@;
            $lc = $lc + $linenr;
            my $stat_real = raw_line($linenr, 0);
            for (my $count = $linenr + 1; $count <= $lc; $count++) {
                $stat_real = $stat_real . "\n" . raw_line($count, 0);
            }
            if ($stat_real =~ /\bsscanf\b\s*\(\s*$FuncArg\s*,\s*("[^"]+")/) {
                my $format = $6;
                my $count = $format =~ tr@%@%@;
                if ($count == 1 &&
                    $format =~ /^"\%(?i:ll[udxi]|[udxi]ll|ll|[hl]h?[udxi]|[udxi][hl]h?|[hl]h?|[udxi])"$/) {
                    WARN("SSCANF_TO_KSTRTO",
                         "Prefer kstrto<type> to single variable sscanf\n" . "$here\n$stat_real\n");
                }
            }
        }

# check for new externs in .h files.
        if ($realfile =~ /\.h$/ &&
            $line =~ /^\+\s*(extern\s+)$Type\s*$Ident\s*\(/s) {
            if (CHK("AVOID_EXTERNS",
                    "extern prototypes should be avoided in .h files\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~ s/(.*)\bextern\b\s*(.*)/$1$2/;
            }
        }

# check for new externs in .c files.
        if ($realfile =~ /\.c$/ && defined $stat &&
            $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
        {
            my $function_name = $1;
            my $paren_space = $2;

            my $s = $stat;
            if (defined $cond) {
                substr($s, 0, length($cond), '');
            }
            if ($s =~ /^\s*;/ &&
                $function_name ne 'uninitialized_var')
            {
                WARN("AVOID_EXTERNS",
                     "externs should be avoided in .c files\n" .  $herecurr);
            }

            if ($paren_space =~ /\n/) {
                WARN("FUNCTION_ARGUMENTS",
                     "arguments for function declarations should follow identifier\n" . $herecurr);
            }

        } elsif ($realfile =~ /\.c$/ && defined $stat &&
                 $stat =~ /^.\s*extern\s+/)
        {
            WARN("AVOID_EXTERNS",
                 "externs should be avoided in .c files\n" .  $herecurr);
        }

# check for pointless casting of kmalloc return
        if ($line =~ /\*\s*\)\s*[kv][czm]alloc(_node){0,1}\b/) {
            WARN("UNNECESSARY_CASTS",
                 "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
        }

# alloc style
# p = alloc(sizeof(struct foo), ...) should be p = alloc(sizeof(*p), ...)
        if ($^V && $^V ge 5.10.0 &&
            $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*([kv][mz]alloc(?:_node)?)\s*\(\s*(sizeof\s*\(\s*struct\s+$Lval\s*\))/) {
            CHK("ALLOC_SIZEOF_STRUCT",
                "Prefer $3(sizeof(*$1)...) over $3($4...)\n" . $herecurr);
        }

# check for multiple semicolons
        if ($line =~ /;\s*;\s*$/) {
            if (WARN("ONE_SEMICOLON",
                     "Statements terminations use 1 semicolon\n" . $herecurr) &&
                $fix) {
                $fixed[$linenr - 1] =~ s/(\s*;\s*){2,}$/;/g;
            }
        }

# check for case / default statements not preceeded by break/fallthrough/switch
        if ($line =~ /^.\s*(?:case\s+(?:$Ident|$Constant)\s*|default):/) {
            my $has_break = 0;
            my $has_statement = 0;
            my $count = 0;
            my $prevline = $linenr;
            while ($prevline > 1 && $count < 3 && !$has_break) {
                $prevline--;
                my $rline = $rawlines[$prevline - 1];
                my $fline = $lines[$prevline - 1];
                last if ($fline =~ /^\@\@/);
                next if ($fline =~ /^\-/);
                next if ($fline =~ /^.(?:\s*(?:case\s+(?:$Ident|$Constant)[\s$;]*|default):[\s$;]*)*$/);
                $has_break = 1 if ($rline =~ /fall[\s_-]*(through|thru)/i);
                next if ($fline =~ /^.[\s$;]*$/);
                $has_statement = 1;
                $count++;
                $has_break = 1 if ($fline =~ /\bswitch\b|\b(?:break\s*;[\s$;]*$|return\b|goto\b|continue\b)/);
            }
            if (!$has_break && $has_statement) {
                WARN("MISSING_BREAK",
                     "Possible switch case/default not preceeded by break or fallthrough comment\n" . $herecurr);
            }
        }

# check for switch/default statements without a break;
        if ($^V && $^V ge 5.10.0 &&
            defined $stat &&
            $stat =~ /^\+[$;\s]*(?:case[$;\s]+\w+[$;\s]*:[$;\s]*|)*[$;\s]*\bdefault[$;\s]*:[$;\s]*;/g) {
            my $ctx = '';
            my $herectx = $here . "\n";
            my $cnt = statement_rawlines($stat);
            for (my $n = 0; $n < $cnt; $n++) {
                $herectx .= raw_line($linenr, $n) . "\n";
            }
            WARN("DEFAULT_NO_BREAK",
                 "switch default: should use break\n" . $herectx);
        }

# check for comparisons against true and false
        if ($line =~ /\+\s*(.*?)\b(true|false|$Lval)\s*(==|\!=)\s*(true|false|$Lval)\b(.*)$/i) {
            my $lead = $1;
            my $arg = $2;
            my $test = $3;
            my $otype = $4;
            my $trail = $5;
            my $op = "!";

            ($arg, $otype) = ($otype, $arg) if ($arg =~ /^(?:true|false)$/i);

            my $type = lc($otype);
            if ($type =~ /^(?:true|false)$/) {
                if (("$test" eq "==" && "$type" eq "true") ||
                    ("$test" eq "!=" && "$type" eq "false")) {
                    $op = "";
                }

                CHK("BOOL_COMPARISON",
                    "Using comparison to $otype is error prone\n" . $herecurr);
            }
        }

# check for semaphores initialized locked
        if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
            WARN("CONSIDER_COMPLETION",
                 "consider using a completion\n" . $herecurr);
        }

# check for %L{u,d,i} in strings
        my $string;
        while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
            $string = substr($rawline, $-[1], $+[1] - $-[1]);
            $string =~ s/%%/__/g;
            if ($string =~ /(?<!%)%L[udi]/) {
                WARN("PRINTF_L",
                     "\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
                last;
            }
        }


# Mode permission misuses where it seems decimal should be octal
# This uses a shortcut match to avoid unnecessary uses of a slow foreach loop
        if ($^V && $^V ge 5.10.0 &&
            $line =~ /$mode_perms_search/) {
            foreach my $entry (@mode_permission_funcs) {
                my $func = $entry->[0];
                my $arg_pos = $entry->[1];

                my $skip_args = "";
                if ($arg_pos > 1) {
                    $arg_pos--;
                    $skip_args = "(?:\\s*$FuncArg\\s*,\\s*){$arg_pos,$arg_pos}";
                }
                my $test = "\\b$func\\s*\\(${skip_args}([\\d]+)\\s*[,\\)]";
                if ($line =~ /$test/) {
                    my $val = $1;
                    $val = $6 if ($skip_args ne "");

                    if ($val !~ /^0$/ &&
                        (($val =~ /^$Int$/ && $val !~ /^$Octal$/) ||
                         length($val) ne 4)) {
                        ERROR("NON_OCTAL_PERMISSIONS",
                              "Use 4 digit octal (0777) not decimal permissions\n" . $herecurr);
                    }
                }
            }
        }
    }

    # If we have no input at all, then there is nothing to report on
    # so just keep quiet.
    if ($#rawlines == -1) {
        exit(0);
    }

    # In mailback mode only produce a report in the negative, for
    # things that appear to be patches.
    if ($mailback && ($clean == 1 || !$is_patch)) {
        exit(0);
    }

    # This is not a patch, and we are are in 'no-patch' mode so
    # just keep quiet.
    if (!$chk_patch && !$is_patch) {
        exit(0);
    }

    if (!$is_patch) {
        ERROR("NOT_UNIFIED_DIFF",
              "Does not appear to be a unified-diff format patch\n");
    }
    if ($is_patch && $chk_signoff && $signoff == 0) {
        ERROR("MISSING_SIGN_OFF",
              "Missing Signed-off-by: line(s)\n");
    }

    print report_dump();
    if ($summary && !($clean == 1 && $quiet == 1)) {
        print "$filename " if ($summary_file);
        if ($cnt_error > 0) {
            print "Patch not according to coding guidelines! please fix.\n";
            print "total: $cnt_error errors, $cnt_warn warnings, " .
                (($check)? "$cnt_chk checks, " : "") .
                "$cnt_lines lines checked\n"; exit 1;
        } else {
            print "total: $cnt_warn warnings, " .
                (($check)? "$cnt_chk checks, " : "") .
                "$cnt_lines lines checked\n";
            print "Patch found to have warnings, please fix if necessary.\n" if ($cnt_warn > 0);
            exit 2;
        }
        print "\n" if ($quiet == 0);
    }

    if ($quiet == 0) {

        if ($^V lt 5.10.0) {
            print("NOTE: perl $^V is not modern enough to detect all possible issues.\n");
            print("An upgrade to at least perl v5.10.0 is suggested.\n\n");
        }

        # If there were whitespace errors which cleanpatch can fix
        # then suggest that.
        if ($rpt_cleaners) {
            print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
            print "      scripts/cleanfile\n\n";
            $rpt_cleaners = 0;
        }
    }

    hash_show_words(\%use_type, "Used");
    hash_show_words(\%ignore_type, "Ignored");

    if ($clean == 0 && $fix && "@rawlines" ne "@fixed") {
        my $newfile = $filename;
        $newfile .= ".EXPERIMENTAL-checkpatch-fixes" if (!$fix_inplace);
        my $linecount = 0;
        my $f;

        open($f, '>', $newfile)
            or die "$P: Can't open $newfile for write\n";
        foreach my $fixed_line (@fixed) {
            $linecount++;
            if ($file) {
                if ($linecount > 3) {
                    $fixed_line =~ s/^\+//;
                    print $f $fixed_line. "\n";
                }
            } else {
                print $f $fixed_line . "\n";
            }
        }
        close($f);

        if (!$quiet) {
            print << "EOM";
Wrote EXPERIMENTAL --fix correction(s) to '$newfile'

Do _NOT_ trust the results written to this file.
Do _NOT_ submit these changes without inspecting them for correctness.

This EXPERIMENTAL file is simply a convenience to help rewrite patches.
No warranties, expressed or implied...
EOM
        }
    }

    if ($clean == 1 && $quiet == 0) {
        print "$vname has no obvious style problems and is ready for submission.\n"
    }
    if ($clean == 0 && $quiet == 0) {
        print << "EOM";
$vname has style problems, please review.

If any of these errors are false positives, please report
them to the maintainer, see MAINTAINERS
EOM
    }

    return $clean;
}