#!/usr/bin/env perl

  # (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>
  # Licensed under the terms of the GNU GPL License version 2
  
  use strict;

  use warnings;

  use POSIX;

  use File::Basename;
  use Cwd 'abs_path';

  use Term::ANSIColor qw(:constants);

  
  my $P = $0;

  my $D = dirname(abs_path($P));

  
  my $V = '0.32';
  
  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 $showfile = 0;

  my $file = 0;

  my $git = 0;
  my %git_commits = ();

  my $check = 0;

  my $check_orig = 0;

  my $summary = 1;
  my $mailback = 0;
  my $summary_file = 0;
  my $show_types = 0;

  my $list_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 $min_conf_desc_length = 4;

  my $spelling_file = "$D/spelling.txt";
  my $codespell = 0;
  my $codespellfile = "/usr/share/codespell/dictionary.txt";

  my $conststructsfile = "$D/const_structs.checkpatch";
  my $typedefsfile = "";
  my $color = "auto";
  my $allow_c99_comments = 1;

  
  sub help {
  	my ($exitcode) = @_;
  
  	print << "EOM";
  Usage: $P [OPTION]... [FILE]...
  Version: $V
  
  Options:
    -q, --quiet                quiet
    --no-tree                  run without a kernel tree
    --no-signoff               do not check for 'Signed-off-by' line
    --patch                    treat FILE as patchfile (default)
    --emacs                    emacs compile window format
    --terse                    one line per report

    --showfile                 emit diffed file position, not input file position
    -g, --git                  treat FILE as a single commit or git revision range
                               single git commit with:
                                 <rev>
                                 <rev>^
                                 <rev>~n
                               multiple git commits with:
                                 <rev1>..<rev2>
                                 <rev1>...<rev2>
                                 <rev>-<count>
                               git merges are ignored

    -f, --file                 treat FILE as regular source file
    --subjective, --strict     enable more subjective tests

    --list-types               list the possible message types

    --types TYPE(,TYPE2...)    show only these comma separated message types

    --ignore TYPE(,TYPE2...)   ignore various comma separated message types

    --show-types               show the specific message type in the output

    --max-line-length=n        set the maximum line length, if exceeded, warn

    --min-conf-desc-length=n   set the min description length, if shorter, warn

    --root=PATH                PATH to the kernel 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.

    --codespell                Use the codespell dictionary for spelling/typos

                               (default:/usr/share/codespell/dictionary.txt)

    --codespellfile            Use this codespell dictionary

    --typedefsfile             Read additional types from this file
    --color[=WHEN]             Use colors 'always', 'never', or only when output
                               is a terminal ('auto'). Default is 'auto'.

    -h, --help, --version      display this help and exit
  
  When FILE is - read standard input.
  EOM
  
  	exit($exitcode);
  }

  sub uniq {
  	my %seen;
  	return grep { !$seen{$_}++ } @_;
  }
  
  sub list_types {
  	my ($exitcode) = @_;
  
  	my $count = 0;
  
  	local $/ = undef;
  
  	open(my $script, '<', abs_path($P)) or
  	    die "$P: Can't read '$P' $!
  ";
  
  	my $text = <$script>;
  	close($script);
  
  	my @types = ();

  	# Also catch when type or level is passed through a variable
  	for ($text =~ /(?:(?:\bCHK|\bWARN|\bERROR|&\{\$msg_level})\s*\(|\$msg_type\s*=)\s*"([^"]+)"/g) {

  		push (@types, $_);
  	}
  	@types = sort(uniq(@types));
  	print("#\tMessage type
  
  ");
  	foreach my $type (@types) {
  		print(++$count . "\t" . $type . "
  ");
  	}
  
  	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 $!
  ";
  
  	while (<$conffile>) {
  		my $line = $_;
  
  		$line =~ s/\s*
  ?$//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;
  }

  # Perl's Getopt::Long allows options to take optional arguments after a space.
  # Prevent --color by itself from consuming other arguments
  foreach (@ARGV) {
  	if ($_ eq "--color" || $_ eq "-color") {
  		$_ = "--color=$color";
  	}
  }

  GetOptions(
  	'q|quiet+'	=> \$quiet,
  	'tree!'		=> \$tree,
  	'signoff!'	=> \$chk_signoff,
  	'patch!'	=> \$chk_patch,
  	'emacs!'	=> \$emacs,
  	'terse!'	=> \$terse,

  	'showfile!'	=> \$showfile,

  	'f|file!'	=> \$file,

  	'g|git!'	=> \$git,

  	'subjective!'	=> \$check,
  	'strict!'	=> \$check,
  	'ignore=s'	=> \@ignore,

  	'types=s'	=> \@use,

  	'show-types!'	=> \$show_types,

  	'list-types!'	=> \$list_types,

  	'max-line-length=i' => \$max_line_length,

  	'min-conf-desc-length=i' => \$min_conf_desc_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,

  	'codespell!'	=> \$codespell,
  	'codespellfile=s'	=> \$codespellfile,
  	'typedefsfile=s'	=> \$typedefsfile,
  	'color=s'	=> \$color,
  	'no-color'	=> \$color,	#keep old behaviors of -nocolor
  	'nocolor'	=> \$color,	#keep old behaviors of -nocolor

  	'h|help'	=> \$help,
  	'version'	=> \$help
  ) or help(1);
  
  help(0) if ($help);

  list_types(0) if ($list_types);

  $fix = 1 if ($fix_inplace);

  $check_orig = $check;

  my $exit = 0;

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

  #if no filenames are given, push '-' to read patch from stdin

  if ($#ARGV < 0) {

  	push(@ARGV, '-');
  }
  
  if ($color =~ /^[01]$/) {
  	$color = !$color;
  } elsif ($color =~ /^always$/i) {
  	$color = 1;
  } elsif ($color =~ /^never$/i) {
  	$color = 0;
  } elsif ($color =~ /^auto$/i) {
  	$color = (-t STDOUT);
  } else {
  	die "Invalid color mode: $color
  ";

  }

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

  	my @array = split(/,/, join(',', @$arrayRef));
  	foreach my $word (@array) {
  		$word =~ s/\s*
  ?$//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 (keys %$hashRef) {
  		print "
  NOTE: $prefix message types:";

  		foreach my $word (sort keys %$hashRef) {
  			print " $word";
  		}

  		print "
  ";

  	}
  }
  
  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 $root) {
  		if (!top_of_kernel_tree($root)) {
  			die "$P: $root: --root does not point at a valid tree
  ";
  		}
  	} else {
  		if (top_of_kernel_tree('.')) {
  			$root = '.';
  		} elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
  						top_of_kernel_tree($1)) {
  			$root = $1;
  		}
  	}
  
  	if (!defined $root) {
  		print "Must be run from the top-level dir. of a kernel tree
  ";
  		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|
  			__private

  		}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|

  			__pure|

  			__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 $String	= qr{"[X\t]*"};

  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 $BasicType;

  our $NonptrType;

  our $NonptrTypeMisordered;

  our $NonptrTypeWithAttr;

  our $Type;

  our $TypeMisordered;

  our $Declare;

  our $DeclareMisordered;

  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 $typeC99Typedefs = qr{(?:__)?(?:[us]_?)?int_?(?:8|16|32|64)_t};
  our $typeOtherOSTypedefs = qr{(?x:
  	u_(?:char|short|int|long) |          # bsd
  	u(?:nchar|short|int|long)            # sysv
  )};
  our $typeKernelTypedefs = qr{(?x:

  	(?:__)?(?:u|s|be|le)(?:8|16|32|64)|
  	atomic_t
  )};

  our $typeTypedefs = qr{(?x:
  	$typeC99Typedefs\b|
  	$typeOtherOSTypedefs\b|
  	$typeKernelTypedefs\b
  )};
  
  our $zero_initializer = qr{(?:(?:0[xX])?0+$Int_type?|NULL|false)\b};

  
  our $logFunctions = qr{(?x:

  	printk(?:_ratelimited|_once|_deferred_once|_deferred|)|

  	(?:[a-z0-9]+_){1,2}(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|

  	TP_printk|

  	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:|
  	Reported-by:|

  	Suggested-by:|

  	To:|
  	Cc:
  )};

  our @typeListMisordered = (
  	qr{char\s+(?:un)?signed},
  	qr{int\s+(?:(?:un)?signed\s+)?short\s},
  	qr{int\s+short(?:\s+(?:un)?signed)},
  	qr{short\s+int(?:\s+(?:un)?signed)},
  	qr{(?:un)?signed\s+int\s+short},
  	qr{short\s+(?:un)?signed},
  	qr{long\s+int\s+(?:un)?signed},
  	qr{int\s+long\s+(?:un)?signed},
  	qr{long\s+(?:un)?signed\s+int},
  	qr{int\s+(?:un)?signed\s+long},
  	qr{int\s+(?:un)?signed},
  	qr{int\s+long\s+long\s+(?:un)?signed},
  	qr{long\s+long\s+int\s+(?:un)?signed},
  	qr{long\s+long\s+(?:un)?signed\s+int},
  	qr{long\s+long\s+(?:un)?signed},
  	qr{long\s+(?:un)?signed},
  );

  our @typeList = (
  	qr{void},

  	qr{(?:(?:un)?signed\s+)?char},
  	qr{(?:(?:un)?signed\s+)?short\s+int},
  	qr{(?:(?:un)?signed\s+)?short},
  	qr{(?:(?:un)?signed\s+)?int},
  	qr{(?:(?:un)?signed\s+)?long\s+int},
  	qr{(?:(?:un)?signed\s+)?long\s+long\s+int},
  	qr{(?:(?:un)?signed\s+)?long\s+long},
  	qr{(?:(?:un)?signed\s+)?long},
  	qr{(?:un)?signed},

  	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},

  	@typeListMisordered,

  );

  
  our $C90_int_types = qr{(?x:
  	long\s+long\s+int\s+(?:un)?signed|
  	long\s+long\s+(?:un)?signed\s+int|
  	long\s+long\s+(?:un)?signed|
  	(?:(?:un)?signed\s+)?long\s+long\s+int|
  	(?:(?:un)?signed\s+)?long\s+long|
  	int\s+long\s+long\s+(?:un)?signed|
  	int\s+(?:(?:un)?signed\s+)?long\s+long|
  
  	long\s+int\s+(?:un)?signed|
  	long\s+(?:un)?signed\s+int|
  	long\s+(?:un)?signed|
  	(?:(?:un)?signed\s+)?long\s+int|
  	(?:(?:un)?signed\s+)?long|
  	int\s+long\s+(?:un)?signed|
  	int\s+(?:(?:un)?signed\s+)?long|
  
  	int\s+(?:un)?signed|
  	(?:(?:un)?signed\s+)?int
  )};
  
  our @typeListFile = ();

  our @typeListWithAttr = (
  	@typeList,
  	qr{struct\s+$InitAttribute\s+$Ident},
  	qr{union\s+$InitAttribute\s+$Ident},
  );

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

  our @modifierListFile = ();
  
  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|SENSOR_DEVICE|IIO_DEVICE)_ATTR", 2],
  	["IIO_DEV_ATTR_[A-Z_]+", 1],
  	["SENSOR_(?:DEVICE_|)ATTR_2", 2],
  	["SENSOR_TEMPLATE(?:_2|)", 3],
  	["__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];
  }

  $mode_perms_search = "(?:${mode_perms_search})";

  
  our $mode_perms_world_writable = qr{
  	S_IWUGO		|
  	S_IWOTH		|
  	S_IRWXUGO	|
  	S_IALLUGO	|
  	0[0-7][0-7][2367]
  }x;
  
  our %mode_permission_string_types = (
  	"S_IRWXU" => 0700,
  	"S_IRUSR" => 0400,
  	"S_IWUSR" => 0200,
  	"S_IXUSR" => 0100,
  	"S_IRWXG" => 0070,
  	"S_IRGRP" => 0040,
  	"S_IWGRP" => 0020,
  	"S_IXGRP" => 0010,
  	"S_IRWXO" => 0007,
  	"S_IROTH" => 0004,
  	"S_IWOTH" => 0002,
  	"S_IXOTH" => 0001,
  	"S_IRWXUGO" => 0777,
  	"S_IRUGO" => 0444,
  	"S_IWUGO" => 0222,
  	"S_IXUGO" => 0111,
  );
  
  #Create a search pattern for all these strings to speed up a loop below
  our $mode_perms_string_search = "";
  foreach my $entry (keys %mode_permission_string_types) {
  	$mode_perms_string_search .= '|' if ($mode_perms_string_search ne "");
  	$mode_perms_string_search .= $entry;
  }

  our $single_mode_perms_string_search = "(?:${mode_perms_string_search})";
  our $multi_mode_perms_string_search = qr{
  	${single_mode_perms_string_search}
  	(?:\s*\|\s*${single_mode_perms_string_search})*
  }x;
  
  sub perms_to_octal {
  	my ($string) = @_;
  
  	return trim($string) if ($string =~ /^\s*0[0-7]{3,3}\s*$/);
  
  	my $val = "";
  	my $oval = "";
  	my $to = 0;
  	my $curpos = 0;
  	my $lastpos = 0;
  	while ($string =~ /\b(($single_mode_perms_string_search)\b(?:\s*\|\s*)?\s*)/g) {
  		$curpos = pos($string);
  		my $match = $2;
  		my $omatch = $1;
  		last if ($lastpos > 0 && ($curpos - length($omatch) != $lastpos));
  		$lastpos = $curpos;
  		$to |= $mode_permission_string_types{$match};
  		$val .= '\s*\|\s*' if ($val ne "");
  		$val .= $match;
  		$oval .= $omatch;
  	}
  	$oval =~ s/^\s*\|\s*//;
  	$oval =~ s/\s*\|\s*$//;
  	return sprintf("%04o", $to);
  }

  
  our $allowed_asm_includes = qr{(?x:
  	irq|

  	memory|
  	time|
  	reboot

  )};
  # memory.h: ARM has a custom one

  # Load common spelling mistakes and build regular expression list.
  my $misspellings;
  my %spelling_fix;
  
  if (open(my $spelling, '<', $spelling_file)) {
  	while (<$spelling>) {
  		my $line = $_;
  
  		$line =~ s/\s*
  ?$//g;
  		$line =~ s/^\s*//g;
  
  		next if ($line =~ m/^\s*#/);
  		next if ($line =~ m/^\s*$/);
  
  		my ($suspect, $fix) = split(/\|\|/, $line);
  
  		$spelling_fix{$suspect} = $fix;
  	}
  	close($spelling);
  } else {
  	warn "No typos will be found - file '$spelling_file': $!
  ";
  }
  
  if ($codespell) {
  	if (open(my $spelling, '<', $codespellfile)) {
  		while (<$spelling>) {
  			my $line = $_;
  
  			$line =~ s/\s*
  ?$//g;
  			$line =~ s/^\s*//g;
  
  			next if ($line =~ m/^\s*#/);
  			next if ($line =~ m/^\s*$/);
  			next if ($line =~ m/, disabled/i);
  
  			$line =~ s/,.*$//;
  
  			my ($suspect, $fix) = split(/->/, $line);
  
  			$spelling_fix{$suspect} = $fix;
  		}
  		close($spelling);
  	} else {
  		warn "No codespell typos will be found - file '$codespellfile': $!
  ";
  	}
  }
  
  $misspellings = join("|", sort keys %spelling_fix) if keys %spelling_fix;

  sub read_words {
  	my ($wordsRef, $file) = @_;
  
  	if (open(my $words, '<', $file)) {
  		while (<$words>) {
  			my $line = $_;
  
  			$line =~ s/\s*
  ?$//g;
  			$line =~ s/^\s*//g;
  
  			next if ($line =~ m/^\s*#/);
  			next if ($line =~ m/^\s*$/);
  			if ($line =~ /\s/) {
  				print("$file: '$line' invalid - ignored
  ");
  				next;
  			}
  
  			$$wordsRef .= '|' if ($$wordsRef ne "");
  			$$wordsRef .= $line;
  		}
  		close($file);
  		return 1;
  	}
  
  	return 0;
  }
  
  my $const_structs = "";
  read_words(\$const_structs, $conststructsfile)
      or warn "No structs that should be const will be found - file '$conststructsfile': $!
  ";
  
  my $typeOtherTypedefs = "";
  if (length($typedefsfile)) {
  	read_words(\$typeOtherTypedefs, $typedefsfile)
  	    or warn "No additional types will be considered - file '$typedefsfile': $!
  ";
  }
  $typeTypedefs .= '|' . $typeOtherTypedefs if ($typeOtherTypedefs ne "");

  sub build_types {

  	my $mods = "(?x:  
  " . join("|
    ", (@modifierList, @modifierListFile)) . "
  )";
  	my $all = "(?x:  
  " . join("|
    ", (@typeList, @typeListFile)) . "
  )";
  	my $Misordered = "(?x:  
  " . join("|
    ", @typeListMisordered) . "
  )";

  	my $allWithAttr = "(?x:  
  " . join("|
    ", @typeListWithAttr) . "
  )";

  	$Modifier	= qr{(?:$Attribute|$Sparse|$mods)};

  	$BasicType	= qr{
  				(?:$typeTypedefs\b)|
  				(?:${all}\b)
  		}x;

  	$NonptrType	= qr{
  			(?:$Modifier\s+|const\s+)*
  			(?:

  				(?:typeof|__typeof__)\s*\([^\)]*\)|

  				(?:$typeTypedefs\b)|
  				(?:${all}\b)
  			)
  			(?:\s+$Modifier|\s+const)*
  		  }x;

  	$NonptrTypeMisordered	= qr{
  			(?:$Modifier\s+|const\s+)*
  			(?:
  				(?:${Misordered}\b)
  			)
  			(?:\s+$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*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+)?
  			(?:\s+$Inline|\s+$Modifier)*
  		  }x;
  	$TypeMisordered	= qr{
  			$NonptrTypeMisordered
  			(?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+)?

  			(?:\s+$Inline|\s+$Modifier)*
  		  }x;

  	$Declare	= qr{(?:$Storage\s+(?:$Inline\s+)?)?$Type};
  	$DeclareMisordered	= qr{(?:$Storage\s+(?:$Inline\s+)?)?$TypeMisordered};

  }
  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|$String)};
  
  our $declaration_macros = qr{(?x:
  	(?:$Storage\s+)?(?:[A-Z_][A-Z0-9]*_){0,2}(?:DEFINE|DECLARE)(?:_[A-Z0-9]+){1,6}\s*\(|
  	(?:$Storage\s+)?[HLP]?LIST_HEAD\s*\(|

  	(?:$Storage\s+)?${Type}\s+uninitialized_var\s*\(|
  	(?:SKCIPHER_REQUEST|SHASH_DESC|AHASH_REQUEST)_ON_STACK\s*\(

  )};

  
  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' $!
  ";
  	my $text = <$include_file>;
  	close($include_file);
  
  	my @lines = split('
  ', $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;
  		}
  	}
  }

  sub is_maintained_obsolete {
  	my ($filename) = @_;
  
  	return 0 if (!$tree || !(-e "$root/scripts/get_maintainer.pl"));
  
  	my $status = `perl $root/scripts/get_maintainer.pl --status --nom --nol --nogit --nogit-fallback -f $filename 2>&1`;
  
  	return $status =~ /obsolete/i;
  }

  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('
  ', $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' $!
  ";
  		while (<$camelcase_file>) {
  			chomp;
  			$camelcase{$_} = 1;
  		}
  		close($camelcase_file);
  
  		return;
  	}
  
  	if (-e ".git") {
  		$files = `git ls-files "include/*.h"`;
  		@include_files = split('
  ', $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' $!
  ";
  		foreach (sort { lc($a) cmp lc($b) } keys(%camelcase)) {
  			print $camelcase_file ("$_
  ");
  		}
  		close($camelcase_file);
  	}
  }

  sub git_commit_info {
  	my ($commit, $id, $desc) = @_;
  
  	return ($id, $desc) if ((which("git") eq "") || !(-e ".git"));
  
  	my $output = `git log --no-color --format='%H %s' -1 $commit 2>&1`;
  	$output =~ s/^\s*//gm;
  	my @lines = split("
  ", $output);
  
  	return ($id, $desc) if ($#lines < 0);
  
  	if ($lines[0] =~ /^error: short SHA1 $commit is ambiguous\./) {
  # Maybe one day convert this block of bash into something that returns
  # all matching commit ids, but it's very slow...
  #
  #		echo "checking commits $1..."
  #		git rev-list --remotes | grep -i "^$1" |
  #		while read line ; do
  #		    git log --format='%H %s' -1 $line |
  #		    echo "commit $(cut -c 1-12,41-)"
  #		done
  	} elsif ($lines[0] =~ /^fatal: ambiguous argument '$commit': unknown revision or path not in the working tree\./) {
  		$id = undef;
  	} else {
  		$id = substr($lines[0], 0, 12);
  		$desc = substr($lines[0], 41);
  	}
  
  	return ($id, $desc);
  }

  $chk_signoff = 0 if ($file);

  my @rawlines = ();
  my @lines = ();

  my @fixed = ();

  my @fixed_inserted = ();
  my @fixed_deleted = ();

  my $fixlinenr = -1;

  # If input is git commits, extract all commits from the commit expressions.
  # For example, HEAD-3 means we need check 'HEAD, HEAD~1, HEAD~2'.
  die "$P: No git repository found
  " if ($git && !-e ".git");
  
  if ($git) {
  	my @commits = ();
  	foreach my $commit_expr (@ARGV) {
  		my $git_range;
  		if ($commit_expr =~ m/^(.*)-(\d+)$/) {
  			$git_range = "-$2 $1";
  		} elsif ($commit_expr =~ m/\.\./) {
  			$git_range = "$commit_expr";
  		} else {
  			$git_range = "-1 $commit_expr";
  		}
  		my $lines = `git log --no-color --no-merges --pretty=format:'%H %s' $git_range`;
  		foreach my $line (split(/
  /, $lines)) {
  			$line =~ /^([0-9a-fA-F]{40,40}) (.*)$/;
  			next if (!defined($1) || !defined($2));
  			my $sha1 = $1;
  			my $subject = $2;
  			unshift(@commits, $sha1);
  			$git_commits{$sha1} = $subject;
  		}
  	}
  	die "$P: no git commits after extraction!
  " if (@commits == 0);
  	@ARGV = @commits;
  }
  
  my $vname;

  for my $filename (@ARGV) {
  	my $FILE;

  	if ($git) {
  		open($FILE, '-|', "git format-patch -M --stdout -1 $filename") ||
  			die "$P: $filename: git format-patch failed - $!
  ";
  	} elsif ($file) {

  		open($FILE, '-|', "diff -u /dev/null $filename") ||
  			die "$P: $filename: diff failed - $!
  ";
  	} elsif ($filename eq '-') {
  		open($FILE, '<&STDIN');
  	} else {
  		open($FILE, '<', "$filename") ||
  			die "$P: $filename: open failed - $!
  ";
  	}
  	if ($filename eq '-') {
  		$vname = 'Your patch';

  	} elsif ($git) {
  		$vname = "Commit " . substr($filename, 0, 12) . ' ("' . $git_commits{$filename} . '")';

  	} else {
  		$vname = $filename;
  	}
  	while (<$FILE>) {
  		chomp;
  		push(@rawlines, $_);
  	}
  	close($FILE);

  
  	if ($#ARGV > 0 && $quiet == 0) {
  		print '-' x length($vname) . "
  ";
  		print "$vname
  ";
  		print '-' x length($vname) . "
  ";
  	}

  	if (!process($filename)) {
  		$exit = 1;
  	}
  	@rawlines = ();
  	@lines = ();

  	@fixed = ();

  	@fixed_inserted = ();
  	@fixed_deleted = ();
  	$fixlinenr = -1;
  	@modifierListFile = ();
  	@typeListFile = ();
  	build_types();
  }
  
  if (!$quiet) {
  	hash_show_words(\%use_type, "Used");
  	hash_show_words(\%ignore_type, "Ignored");
  
  	if ($^V lt 5.10.0) {
  		print << "EOM"
  
  NOTE: perl $^V is not modern enough to detect all possible issues.
        An upgrade to at least perl v5.10.0 is suggested.
  EOM
  	}
  	if ($exit) {
  		print << "EOM"
  
  NOTE: If any of the errors are false positives, please report
        them to the maintainer, see CHECKPATCH in MAINTAINERS.
  EOM
  	}

  }
  
  exit($exit);
  
  sub top_of_kernel_tree {
  	my ($root) = @_;
  
  	my @tree_check = (

  		"COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",

  		"README", "Documentation", "arch", "include", "drivers",
  		"fs", "init", "ipc", "kernel", "lib", "scripts",
  	);
  
  	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;

  		$formatted_email =~ s/\Q$address\E.*$//;

  		$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 {
  	my ($bin) = @_;
  
  	foreach my $path (split(/:/, $ENV{PATH})) {
  		if (-e "$path/$bin") {
  			return "$path/$bin";
  		}
  	}
  
  	return "";
  }

  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 whacking completely 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>
  ";
  		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@;
  	}

  	if ($allow_c99_comments && $res =~ m@(//.*$)@) {
  		my $match = $1;
  		$res =~ s/\Q$match\E/"$;" x length($match)/e;
  	}

  	return $res;
  }

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

  	return "" if (!defined($line) || !defined($rawline));

  	return "" if ($line !~ m/($String)/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>
  ";
  		# 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] . "
  ";
  				$len = length($blk);
  				$line++;
  				last;
  			}
  			# Bail if there is no further context.
  			#warn "CSB: blk<$blk> off<$off> len<$len>
  ";
  			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>
  ";
  
  		# 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<$1>
  ";
  			#warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]
  ";
  		}
  
  		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>
  ";
  			}
  		}
  		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 "
  " && $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<$statement>
  ";
  	#warn "CONDITION<$condition>
  ";
  
  	#print "coff<$coff> soff<$off> loff<$loff>
  ";
  
  	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/(^|
  )./$1/g;
  	$stmt =~ s/^\s*//;
  	$stmt =~ s/\s*$//;
  
  	my @stmt_lines = ($stmt =~ /
  /g);
  
  	return $#stmt_lines + 2;
  }
  
  sub statement_rawlines {
  	my ($stmt) = @_;
  
  	my @stmt_lines = ($stmt =~ /
  /g);
  
  	return $#stmt_lines + 2;
  }
  
  sub statement_block_size {
  	my ($stmt) = @_;
  
  	$stmt =~ s/(^|
  )./$1/g;
  	$stmt =~ s/^\s*{//;
  	$stmt =~ s/}\s*$//;
  	$stmt =~ s/^\s*//;
  	$stmt =~ s/\s*$//;
  
  	my @stmt_lines = ($stmt =~ /
  /g);
  	my @stmt_statements = ($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>
  ";
  	push(@chunks, [ $condition, $statement ]);
  	if (!($remain > 0 && $condition =~ /^\s*(?:
  [+-])?\s*(?:if|else|do)\b/s)) {
  		return ($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>
  ";
  		last if (!($remain > 0 && $condition =~ /^(?:\s*
  [+-])*\s*(?:else|do)\b/s));
  		#print "C: push
  ";
  		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<$off>
  ";
  			if ($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 "           $line
  ";
  		if ($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 .= $line . "
  " if ($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 ]
  ";
  	##print "CMMT: $cmt
  ";
  
  	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 get_stat_real {
  	my ($linenr, $lc) = @_;
  
  	my $stat_real = raw_line($linenr, 0);
  	for (my $count = $linenr + 1; $count <= $lc; $count++) {
  		$stat_real = $stat_real . "
  " . raw_line($count, 0);
  	}
  
  	return $stat_real;
  }
  
  sub get_stat_here {
  	my ($linenr, $cnt, $here) = @_;
  
  	my $herectx = $here . "
  ";
  	for (my $n = 0; $n < $cnt; $n++) {
  		$herectx .= raw_line($linenr, $n) . "
  ";
  	}
  
  	return $herectx;
  }

  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 "$stream
  " if ($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($1)
  " if ($dbg_values > 1);
  			if ($1 =~ /
  / && $av_preprocessor) {
  				$type = pop(@av_paren_type);
  				$av_preprocessor = 0;
  			}
  
  		} elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
  			print "CAST($1)
  " if ($dbg_values > 1);
  			push(@av_paren_type, $type);

  			$type = 'c';

  
  		} elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
  			print "DECLARE($1)
  " if ($dbg_values > 1);
  			$type = 'T';
  
  		} elsif ($cur =~ /^($Modifier)\s*/) {
  			print "MODIFIER($1)
  " if ($dbg_values > 1);
  			$type = 'T';
  
  		} elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
  			print "DEFINE($1,$2)
  " if ($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($1)
  " if ($dbg_values > 1);
  			$av_preprocessor = 1;
  			push(@av_paren_type, $type);
  
  		} elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
  			print "PRE_START($1)
  " if ($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($1)
  " if ($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($1)
  " if ($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 =~ /^(\\
  )/o) {
  			print "PRECONT($1)
  " if ($dbg_values > 1);
  
  		} elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
  			print "ATTR($1)
  " if ($dbg_values > 1);
  			$av_pending = $type;
  			$type = 'N';
  
  		} elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
  			print "SIZEOF($1)
  " if ($dbg_values > 1);
  			if (defined $2) {
  				$av_pending = 'V';
  			}
  			$type = 'N';
  
  		} elsif ($cur =~ /^(if|while|for)\b/o) {
  			print "COND($1)
  " if ($dbg_values > 1);
  			$av_pending = 'E';
  			$type = 'N';
  
  		} elsif ($cur =~/^(case)/o) {
  			print "CASE($1)
  " if ($dbg_values > 1);
  			$av_pend_colon = 'C';
  			$type = 'N';
  
  		} elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
  			print "KEYWORD($1)
  " if ($dbg_values > 1);
  			$type = 'N';
  
  		} elsif ($cur =~ /^(\()/o) {
  			print "PAREN('$1')
  " if ($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') -> $type
  "
  							if ($dbg_values > 1);
  			} else {
  				print "PAREN('$1')
  " if ($dbg_values > 1);
  			}
  
  		} elsif ($cur =~ /^($Ident)\s*\(/o) {
  			print "FUNC($1)
  " if ($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>$av_pend_colon)
  " if ($dbg_values > 1);
  			$type = 'V';
  
  		} elsif ($cur =~ /^($Ident|$Constant)/o) {
  			print "IDENT($1)
  " if ($dbg_values > 1);
  			$type = 'V';
  
  		} elsif ($cur =~ /^($Assignment)/o) {
  			print "ASSIGN($1)
  " if ($dbg_values > 1);
  			$type = 'N';
  
  		} elsif ($cur =~/^(;|{|})/) {
  			print "END($1)
  " if ($dbg_values > 1);
  			$type = 'E';
  			$av_pend_colon = 'O';
  
  		} elsif ($cur =~/^(,)/) {
  			print "COMMA($1)
  " if ($dbg_values > 1);
  			$type = 'C';
  
  		} elsif ($cur =~ /^(\?)/o) {
  			print "QUESTION($1)
  " if ($dbg_values > 1);
  			$type = 'N';
  
  		} elsif ($cur =~ /^(:)/o) {
  			print "COLON($1,$av_pend_colon)
  " 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($1)
  " if ($dbg_values > 1);
  			$type = 'N';
  
  		} elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
  			my $variant;
  
  			print "OPV($1)
  " if ($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($1)
  " if ($dbg_values > 1);
  			if ($1 ne '++' && $1 ne '--') {
  				$type = 'N';
  			}
  
  		} elsif ($cur =~ /(^.)/o) {
  			print "C($1)
  " if ($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> ($line)
  " if ($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) ($line)
  " if ($dbg_possible);

  					push(@modifierListFile, $modifier);

  				}
  			}
  
  		} else {
  			warn "POSSIBLE: $possible ($line)
  " if ($dbg_possible);

  			push(@typeListFile, $possible);

  		}
  		build_types();
  	} else {
  		warn "NOTPOSS: $possible ($line)
  " if ($dbg_possible > 1);
  	}
  }
  
  my $prefix = '';
  
  sub show_type {

  	my ($type) = @_;
  
  	$type =~ tr/[a-z]/[A-Z]/;

  	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 $output = '';
  	if ($color) {
  		if ($level eq 'ERROR') {
  			$output .= RED;
  		} elsif ($level eq 'WARNING') {
  			$output .= YELLOW;
  		} else {
  			$output .= GREEN;
  		}
  	}
  	$output .= $prefix . $level . ':';

  	if ($show_types) {

  		$output .= BLUE if ($color);
  		$output .= "$type:";
  	}
  	$output .= RESET if ($color);
  	$output .= ' ' . $msg . "
  ";
  
  	if ($showfile) {
  		my @lines = split("
  ", $output, -1);
  		splice(@lines, 1, 1);
  		$output = join("
  ", @lines);

  	}

  	$output = (split('
  ', $output))[0] . "
  " if ($terse);

  	push(our @report, $output);

  
  	return 1;
  }

  sub report_dump {
  	our @report;
  }

  sub fixup_current_range {
  	my ($lineRef, $offset, $length) = @_;
  
  	if ($$lineRef =~ /^\@\@ -\d+,\d+ \+(\d+),(\d+) \@\@/) {
  		my $o = $1;
  		my $l = $2;
  		my $no = $o + $offset;
  		my $nl = $l + $length;
  		$$lineRef =~ s/\+$o,$l \@\@/\+$no,$nl \@\@/;
  	}
  }
  
  sub fix_inserted_deleted_lines {
  	my ($linesRef, $insertedRef, $deletedRef) = @_;
  
  	my $range_last_linenr = 0;
  	my $delta_offset = 0;
  
  	my $old_linenr = 0;
  	my $new_linenr = 0;
  
  	my $next_insert = 0;
  	my $next_delete = 0;
  
  	my @lines = ();
  
  	my $inserted = @{$insertedRef}[$next_insert++];
  	my $deleted = @{$deletedRef}[$next_delete++];
  
  	foreach my $old_line (@{$linesRef}) {
  		my $save_line = 1;
  		my $line = $old_line;	#don't modify the array
  		if ($line =~ /^(?:\+\+\+|\-\-\-)\s+\S+/) {	#new filename
  			$delta_offset = 0;
  		} elsif ($line =~ /^\@\@ -\d+,\d+ \+\d+,\d+ \@\@/) {	#new hunk
  			$range_last_linenr = $new_linenr;
  			fixup_current_range(\$line, $delta_offset, 0);
  		}
  
  		while (defined($deleted) && ${$deleted}{'LINENR'} == $old_linenr) {
  			$deleted = @{$deletedRef}[$next_delete++];
  			$save_line = 0;
  			fixup_current_range(\$lines[$range_last_linenr], $delta_offset--, -1);
  		}
  
  		while (defined($inserted) && ${$inserted}{'LINENR'} == $old_linenr) {
  			push(@lines, ${$inserted}{'LINE'});
  			$inserted = @{$insertedRef}[$next_insert++];
  			$new_linenr++;
  			fixup_current_range(\$lines[$range_last_linenr], $delta_offset++, 1);
  		}
  
  		if ($save_line) {
  			push(@lines, $line);
  			$new_linenr++;
  		}
  
  		$old_linenr++;
  	}
  
  	return @lines;
  }
  
  sub fix_insert_line {
  	my ($linenr, $line) = @_;
  
  	my $inserted = {
  		LINENR => $linenr,
  		LINE => $line,
  	};
  	push(@fixed_inserted, $inserted);
  }
  
  sub fix_delete_line {
  	my ($linenr, $line) = @_;
  
  	my $deleted = {
  		LINENR => $linenr,
  		LINE => $line,
  	};
  
  	push(@fixed_deleted, $deleted);
  }

  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)) {

  		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>
  ";
  
  	# See if any suffix of this path is a path within the tree.
  	while ($file =~ s@^[^/]*/@@) {
  		if (-f "$root/$file") {
  			##print "file<$file>
  ";
  			last;
  		}
  	}
  	if (! -f _)  {
  		return 0;
  	}
  
  	# It is, so see if the prefix is acceptable.
  	my $prefix = $absolute;
  	substr($prefix, -length($file)) = '';
  
  	##print "prefix<$prefix>
  ";
  	if ($prefix ne ".../") {
  		WARN("USE_RELATIVE_PATH",
  		     "use relative pathname instead of absolute in changelog text
  " . $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 = $file ? 0 : 1;

  	my $in_commit_log = 0;		#Scanning lines before patch

  	my $has_commit_log = 0;		#Encountered lines before patch
  	my $commit_log_possible_stack_dump = 0;
  	my $commit_log_long_line = 0;
  	my $commit_log_has_diff = 0;
  	my $reported_maintainer_file = 0;

  	my $non_utf8_charset = 0;

  	my $last_blank_line = 0;
  	my $last_coalesced_string_linenr = -1;

  	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 $context_function;		#undef'd unless there's a known function

  	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;

  	my $checklicenseline = 1;

  	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 ($1 =~ m@Documentation/admin-guide/kernel-parameters.rst$@) {

  				$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]>
  ";
  				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> $rawline
  ";
  			sanitise_line_reset($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 "==>$rawline
  ";
  		#print "-->$line
  ";
  
  		if ($setup_docs && $line =~ /^\+/) {
  			push(@setup_docs, $line);
  		}
  	}
  
  	$prefix = '';
  
  	$realcnt = 0;
  	$linenr = 0;

  	$fixlinenr = -1;

  	foreach my $line (@lines) {
  		$linenr++;

  		$fixlinenr++;

  		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 (!$in_commit_log &&
  		    $line =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@(.*)/) {
  			my $context = $4;

  			$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;

  			if ($context =~ /\b(\w+)\s*\(/) {
  				$context_function = $1;
  			} else {
  				undef $context_function;
  			}

  			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>
  ";
  
  		} elsif ($realcnt == 1) {
  			$realcnt--;
  		}
  
  		my $hunk_line = ($realcnt != 0);

  		$here = "#$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
  ");
  			}
  
  			if ($realfile =~ m@^include/asm/@) {
  				ERROR("MODIFIED_INCLUDE_ASM",
  				      "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>
  " . "$here$rawline
  ");
  			}

  			$found_file = 1;
  		}
  
  #make up the handle for any error we report on this line
  		if ($showfile) {
  			$prefix = "$realfile:$realline: "
  		} elsif ($emacs) {
  			if ($file) {
  				$prefix = "$filename:$realline: ";
  			} else {
  				$prefix = "$filename:$linenr: ";
  			}
  		}
  
  		if ($found_file) {
  			if (is_maintained_obsolete($realfile)) {
  				WARN("OBSOLETE",
  				     "$realfile is marked as 'obsolete' in the MAINTAINERS hierarchy.  No unnecessary modifications please.
  ");
  			}
  			if ($realfile =~ m@^(?:drivers/net/|net/|drivers/staging/)@) {
  				$check = 1;
  			} else {
  				$check = $check_orig;
  			}

  			$checklicenseline = 1;

  			next;
  		}
  
  		$here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
  
  		my $hereline = "$here
  $rawline
  ";
  		my $herecurr = "$here
  $rawline
  ";
  		my $hereprev = "$here
  $prevrawline
  $rawline
  ";
  
  		$cnt_lines++ if ($realcnt != 0);

  # Check if the commit log has what seems like a diff which can confuse patch
  		if ($in_commit_log && !$commit_log_has_diff &&
  		    (($line =~ m@^\s+diff\b.*a/[\w/]+@ &&
  		      $line =~ m@^\s+diff\b.*a/([\w/]+)\s+b/$1\b@) ||
  		     $line =~ m@^\s*(?:\-\-\-\s+a/|\+\+\+\s+b/)@ ||
  		     $line =~ m/^\s*\@\@ \-\d+,\d+ \+\d+,\d+ \@\@/)) {
  			ERROR("DIFF_IN_COMMIT_MSG",
  			      "Avoid using diff content in the commit message - patch(1) might not work
  " . $herecurr);
  			$commit_log_has_diff = 1;
  		}

  # Check for incorrect file permissions
  		if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
  			my $permhere = $here . "FILE: $realfile
  ";

  			if ($realfile !~ m@scripts/@ &&
  			    $realfile !~ /\.(py|pl|awk|sh)$/) {

  				ERROR("EXECUTE_PERMISSIONS",
  				      "do not set execute permissions for source files
  " . $permhere);
  			}
  		}
  
  # Check the patch for a signoff:
  		if ($line =~ /^\s*signed-off-by:/i) {
  			$signoff++;

  			$in_commit_log = 0;

  		}

  # Check if MAINTAINERS is being updated.  If so, there's probably no need to
  # emit the "does MAINTAINERS need updating?" message on file add/move/delete
  		if ($line =~ /^\s*MAINTAINERS\s*\|/) {
  			$reported_maintainer_file = 1;
  		}

  # 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
  " . $herecurr);
  			}

  			if (defined $space_before && $space_before ne "") {

  				if (WARN("BAD_SIGN_OFF",
  					 "Do not use whitespace before $ucfirst_sign_off
  " . $herecurr) &&
  				    $fix) {

  					$fixed[$fixlinenr] =

  					    "$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
  " . $herecurr) &&
  				    $fix) {

  					$fixed[$fixlinenr] =

  					    "$ucfirst_sign_off $email";
  				}

  			}
  			if (!defined $space_after || $space_after ne " ") {

  				if (WARN("BAD_SIGN_OFF",
  					 "Use a single space after $ucfirst_sign_off
  " . $herecurr) &&
  				    $fix) {

  					$fixed[$fixlinenr] =

  					    "$ucfirst_sign_off $email";
  				}

  			}
  
  			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'
  " . $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'
  " . $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
  " . $herecurr);
  			} else {
  				$signatures{$sig_nospace} = 1;
  			}

  		}

  # Check email subject for common tools that don't need to be mentioned
  		if ($in_header_lines &&
  		    $line =~ /^Subject:.*\b(?:checkpatch|sparse|smatch)\b[^:]/i) {
  			WARN("EMAIL_SUBJECT",
  			     "A patch subject line should describe the change not the tool that found it
  " . $herecurr);
  		}
  
  # Check for old stable address
  		if ($line =~ /^\s*cc:\s*.*<?\bstable\@kernel\.org\b>?.*$/i) {
  			ERROR("STABLE_ADDRESS",
  			      "The 'stable' address should be 'stable\@vger.kernel.org'
  " . $herecurr);
  		}
  
  # Check for unwanted Gerrit info
  		if ($in_commit_log && $line =~ /^\s*change-id:/i) {
  			ERROR("GERRIT_CHANGE_ID",
  			      "Remove Gerrit Change-Id's before submitting upstream.
  " . $herecurr);
  		}
  
  # Check if the commit log is in a possible stack dump
  		if ($in_commit_log && !$commit_log_possible_stack_dump &&
  		    ($line =~ /^\s*(?:WARNING:|BUG:)/ ||
  		     $line =~ /^\s*\[\s*\d+\.\d{6,6}\s*\]/ ||
  					# timestamp
  		     $line =~ /^\s*\[\<[0-9a-fA-F]{8,}\>\]/)) {
  					# stack dump address
  			$commit_log_possible_stack_dump = 1;
  		}
  
  # Check for line lengths > 75 in commit log, warn once
  		if ($in_commit_log && !$commit_log_long_line &&
  		    length($line) > 75 &&
  		    !($line =~ /^\s*[a-zA-Z0-9_\/\.]+\s+\|\s+\d+/ ||
  					# file delta changes
  		      $line =~ /^\s*(?:[\w\.\-]+\/)++[\w\.\-]+:/ ||
  					# filename then :
  		      $line =~ /^\s*(?:Fixes:|Link:)/i ||
  					# A Fixes: or Link: line
  		      $commit_log_possible_stack_dump)) {
  			WARN("COMMIT_LOG_LONG_LINE",
  			     "Possible unwrapped commit description (prefer a maximum 75 chars per line)
  " . $herecurr);
  			$commit_log_long_line = 1;
  		}
  
  # Reset possible stack dump if a blank line is found
  		if ($in_commit_log && $commit_log_possible_stack_dump &&
  		    $line =~ /^\s*$/) {
  			$commit_log_possible_stack_dump = 0;
  		}
  
  # Check for git id commit length and improperly formed commit descriptions
  		if ($in_commit_log && !$commit_log_possible_stack_dump &&
  		    $line !~ /^\s*(?:Link|Patchwork|http|https|BugLink):/i &&
  		    $line !~ /^This reverts commit [0-9a-f]{7,40}/ &&
  		    ($line =~ /\bcommit\s+[0-9a-f]{5,}\b/i ||
  		     ($line =~ /(?:\s|^)[0-9a-f]{12,40}(?:[\s"'\(\[]|$)/i &&
  		      $line !~ /[\<\[][0-9a-f]{12,40}[\>\]]/i &&
  		      $line !~ /\bfixes:\s*[0-9a-f]{12,40}/i))) {
  			my $init_char = "c";
  			my $orig_commit = "";
  			my $short = 1;
  			my $long = 0;
  			my $case = 1;
  			my $space = 1;
  			my $hasdesc = 0;
  			my $hasparens = 0;
  			my $id = '0123456789ab';
  			my $orig_desc = "commit description";
  			my $description = "";
  
  			if ($line =~ /\b(c)ommit\s+([0-9a-f]{5,})\b/i) {
  				$init_char = $1;
  				$orig_commit = lc($2);
  			} elsif ($line =~ /\b([0-9a-f]{12,40})\b/i) {
  				$orig_commit = lc($1);
  			}
  
  			$short = 0 if ($line =~ /\bcommit\s+[0-9a-f]{12,40}/i);
  			$long = 1 if ($line =~ /\bcommit\s+[0-9a-f]{41,}/i);
  			$space = 0 if ($line =~ /\bcommit [0-9a-f]/i);
  			$case = 0 if ($line =~ /\b[Cc]ommit\s+[0-9a-f]{5,40}[^A-F]/);
  			if ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)"\)/i) {
  				$orig_desc = $1;
  				$hasparens = 1;
  			} elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s*$/i &&
  				 defined $rawlines[$linenr] &&
  				 $rawlines[$linenr] =~ /^\s*\("([^"]+)"\)/) {
  				$orig_desc = $1;
  				$hasparens = 1;
  			} elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("[^"]+$/i &&
  				 defined $rawlines[$linenr] &&
  				 $rawlines[$linenr] =~ /^\s*[^"]+"\)/) {
  				$line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)$/i;
  				$orig_desc = $1;
  				$rawlines[$linenr] =~ /^\s*([^"]+)"\)/;
  				$orig_desc .= " " . $1;
  				$hasparens = 1;
  			}
  
  			($id, $description) = git_commit_info($orig_commit,
  							      $id, $orig_desc);
  
  			if (defined($id) &&
  			   ($short || $long || $space || $case || ($orig_desc ne $description) || !$hasparens)) {
  				ERROR("GIT_COMMIT_ID",
  				      "Please use git commit description style 'commit <12+ chars of sha1> (\"<title line>\")' - ie: '${init_char}ommit $id (\"$description\")'
  " . $herecurr);
  			}
  		}
  
  # Check for added, moved or deleted files
  		if (!$reported_maintainer_file && !$in_commit_log &&
  		    ($line =~ /^(?:new|deleted) file mode\s*\d+\s*$/ ||
  		     $line =~ /^rename (?:from|to) [\w\/\.\-]+\s*$/ ||
  		     ($line =~ /\{\s*([\w\/\.\-]*)\s*\=\>\s*([\w\/\.\-]*)\s*\}/ &&
  		      (defined($1) || defined($2))))) {
  			$is_patch = 1;
  			$reported_maintainer_file = 1;
  			WARN("FILE_PATH_CHANGES",
  			     "added, moved or deleted file(s), does MAINTAINERS need updating?
  " . $herecurr);
  		}

  # 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?)
  " .
  				$herecurr) if (!$emitted_corrupt++);
  		}

  # 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
  ";
  
  			CHK("INVALID_UTF8",
  			    "Invalid UTF-8, patch and commit message should be encoded in UTF-8
  " . $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 && $realfile =~ /^$/ &&

  		    !($rawline =~ /^\s+(?:\S|$)/ ||
  		      $rawline =~ /^(?:commit\b|from\b|[\w-]+:)/i)) {

  			$in_header_lines = 0;
  			$in_commit_log = 1;

  			$has_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
  " . $herecurr);
  		}

  # Check for absolute kernel paths in commit message
  		if ($tree && $in_commit_log) {
  			while ($line =~ m{(?:^|\s)(/\S*)}g) {
  				my $file = $1;
  
  				if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
  				    check_absolute_file($1, $herecurr)) {
  					#
  				} else {
  					check_absolute_file($file, $herecurr);
  				}
  			}
  		}

  # Check for various typo / spelling mistakes
  		if (defined($misspellings) &&
  		    ($in_commit_log || $line =~ /^(?:\+|Subject:)/i)) {
  			while ($rawline =~ /(?:^|[^a-z@])($misspellings)(?:\b|$|[^a-z@])/gi) {
  				my $typo = $1;
  				my $typo_fix = $spelling_fix{lc($typo)};
  				$typo_fix = ucfirst($typo_fix) if ($typo =~ /^[A-Z]/);
  				$typo_fix = uc($typo_fix) if ($typo =~ /^[A-Z]+$/);

  				my $msg_level = \&WARN;
  				$msg_level = \&CHK if ($file);
  				if (&{$msg_level}("TYPO_SPELLING",
  						  "'$typo' may be misspelled - perhaps '$typo_fix'?
  " . $herecurr) &&

  				    $fix) {
  					$fixed[$fixlinenr] =~ s/(^|[^A-Za-z@])($typo)($|[^A-Za-z@])/$1$typo_fix$3/;
  				}
  			}
  		}

  # ignore non-hunk lines and lines being removed
  		next if (!$hunk_line || $line =~ /^-/);
  
  #trailing whitespace
  		if ($line =~ /^\+.*\015/) {
  			my $herevet = "$here
  " . cat_vet($rawline) . "
  ";

  			if (ERROR("DOS_LINE_ENDINGS",
  				  "DOS line endings
  " . $herevet) &&
  			    $fix) {

  				$fixed[$fixlinenr] =~ s/[\s\015]+$//;

  			}

  		} elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
  			my $herevet = "$here
  " . cat_vet($rawline) . "
  ";

  			if (ERROR("TRAILING_WHITESPACE",
  				  "trailing whitespace
  " . $herevet) &&
  			    $fix) {

  				$fixed[$fixlinenr] =~ s/\s+$//;

  			}

  			$rpt_cleaners = 1;
  		}

  # Check for FSF mailing addresses.
  		if ($rawline =~ /\bwrite to the Free/i ||

  		    $rawline =~ /\b675\s+Mass\s+Ave/i ||

  		    $rawline =~ /\b59\s+Temple\s+Pl/i ||
  		    $rawline =~ /\b51\s+Franklin\s+St/i) {
  			my $herevet = "$here
  " . cat_vet($rawline) . "
  ";

  			my $msg_level = \&ERROR;
  			$msg_level = \&CHK if ($file);
  			&{$msg_level}("FSF_MAILING_ADDRESS",
  				      "Do not include the paragraph about writing to the Free Software Foundation's mailing address from the sample GPL notice. The FSF has changed addresses in the past, and may do so again. Linux already includes a copy of the GPL.
  " . $herevet)

  		}

  # check for Kconfig help text having a real description
  # Only applies when adding the entry originally, after that we do not have
  # sufficient context to determine whether it is indeed long enough.
  		if ($realfile =~ /Kconfig/ &&

  		    # 'choice' is usually the last thing on the line (though
  		    # Kconfig supports named choices), so use a word boundary
  		    # (\b) rather than a whitespace character (\s)
  		    $line =~ /^\+\s*(?:config|menuconfig|choice)\b/) {

  			my $length = 0;
  			my $cnt = $realcnt;
  			my $ln = $linenr + 1;
  			my $f;

  			my $is_start = 0;

  			my $is_end = 0;

  			for (; $cnt > 0 && defined $lines[$ln - 1]; $ln++) {

  				$f = $lines[$ln - 1];
  				$cnt-- if ($lines[$ln - 1] !~ /^-/);
  				$is_end = $lines[$ln - 1] =~ /^\+/;

  
  				next if ($f =~ /^-/);

  				last if (!$file && $f =~ /^\@\@/);

  				if ($lines[$ln - 1] =~ /^\+\s*(?:bool|tristate|prompt)\s*["']/) {

  					$is_start = 1;

  				} elsif ($lines[$ln - 1] =~ /^\+\s*(?:help|---help---)\s*$/) {
  					if ($lines[$ln - 1] =~ "---help---") {
  						WARN("CONFIG_DESCRIPTION",
  						     "prefer 'help' over '---help---' for new help texts
  " . $herecurr);
  					}

  					$length = -1;
  				}

  				$f =~ s/^.//;
  				$f =~ s/#.*//;
  				$f =~ s/^\s+//;
  				next if ($f =~ /^$/);

  
  				# This only checks context lines in the patch
  				# and so hopefully shouldn't trigger false
  				# positives, even though some of these are
  				# common words in help texts
  				if ($f =~ /^\s*(?:config|menuconfig|choice|endchoice|
  						  if|endif|menu|endmenu|source)\b/x) {

  					$is_end = 1;
  					last;
  				}
  				$length++;
  			}

  			if ($is_start && $is_end && $length < $min_conf_desc_length) {
  				WARN("CONFIG_DESCRIPTION",
  				     "please write a paragraph that describes the config symbol fully
  " . $herecurr);
  			}

  			#print "is_start<$is_start> is_end<$is_end> length<$length>
  ";
  		}

  # check for MAINTAINERS entries that don't have the right form
  		if ($realfile =~ /^MAINTAINERS$/ &&
  		    $rawline =~ /^\+[A-Z]:/ &&
  		    $rawline !~ /^\+[A-Z]:\t\S/) {
  			if (WARN("MAINTAINERS_STYLE",
  				 "MAINTAINERS entries use one tab after TYPE:
  " . $herecurr) &&
  			    $fix) {
  				$fixed[$fixlinenr] =~ s/^(\+[A-Z]):\s*/$1:\t/;
  			}
  		}
  
  # discourage the use of boolean for type definition attributes of Kconfig options

  		if ($realfile =~ /Kconfig/ &&

  		    $line =~ /^\+\s*\bboolean\b/) {
  			WARN("CONFIG_TYPE_BOOLEAN",
  			     "Use of boolean is deprecated, please use bool instead.
  " . $herecurr);

  		}
  
  		if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
  		    ($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.
  " . $herecurr) if ($replacement->{$flag});

  		}

  # check for DT compatible documentation

  		if (defined $root &&
  			(($realfile =~ /\.dtsi?$/ && $line =~ /^\+\s*compatible\s*=\s*\"/) ||
  			 ($realfile =~ /\.[ch]$/ && $line =~ /^\+.*\.compatible\s*=\s*\"/))) {

  			my @compats = $rawline =~ /\"([a-zA-Z0-9\-\,\.\+_]+)\"/g;

  			my $dt_path = $root . "/Documentation/devicetree/bindings/";
  			my $vp_file = $dt_path . "vendor-prefixes.txt";

  			foreach my $compat (@compats) {
  				my $compat2 = $compat;

  				$compat2 =~ s/\,[a-zA-Z0-9]*\-/\,<\.\*>\-/;
  				my $compat3 = $compat;
  				$compat3 =~ s/\,([a-z]*)[0-9]*\-/\,$1<\.\*>\-/;
  				`grep -Erq "$compat|$compat2|$compat3" $dt_path`;

  				if ( $? >> 8 ) {
  					WARN("UNDOCUMENTED_DT_STRING",
  					     "DT compatible string \"$compat\" appears un-documented -- check $dt_path
  " . $herecurr);
  				}

  				next if $compat !~ /^([a-zA-Z0-9\-]+)\,/;
  				my $vendor = $1;
  				`grep -Eq "^$vendor\\b" $vp_file`;

  				if ( $? >> 8 ) {
  					WARN("UNDOCUMENTED_DT_STRING",

  					     "DT compatible string vendor \"$vendor\" appears un-documented -- check $vp_file
  " . $herecurr);

  				}
  			}
  		}

  # check for using SPDX license tag at beginning of files
  		if ($realline == $checklicenseline) {
  			if ($rawline =~ /^[ \+]\s*\#\!\s*\//) {
  				$checklicenseline = 2;
  			} elsif ($rawline =~ /^\+/) {
  				my $comment = "";
  				if ($realfile =~ /\.(h|s|S)$/) {
  					$comment = '/*';
  				} elsif ($realfile =~ /\.(c|dts|dtsi)$/) {
  					$comment = '//';
  				} elsif (($checklicenseline == 2) || $realfile =~ /\.(sh|pl|py|awk|tc)$/) {
  					$comment = '#';
  				} elsif ($realfile =~ /\.rst$/) {
  					$comment = '..';
  				}
  
  				if ($comment !~ /^$/ &&
  				    $rawline !~ /^\+\Q$comment\E SPDX-License-Identifier: /) {
  					WARN("SPDX_LICENSE_TAG",
  					     "Missing or malformed SPDX-License-Identifier tag in line $checklicenseline
  " . $herecurr);
  				}
  			}
  		}

  # check we are in a valid source file if not then ignore this hunk

  		next if ($realfile !~ /\.(h|c|s|S|sh|dtsi|dts)$/);

  # line length limit (with some exclusions)
  #
  # There are a few types of lines that may extend beyond $max_line_length:
  #	logging functions like pr_info that end in a string
  #	lines with a single string
  #	#defines that are a single string

  #	lines with an RFC3986 like URL

  #
  # There are 3 different line length message types:

  # LONG_LINE_COMMENT	a comment starts before but extends beyond $max_line_length

  # LONG_LINE_STRING	a string starts before but extends beyond $max_line_length
  # LONG_LINE		all other lines longer than $max_line_length
  #
  # if LONG_LINE is ignored, the other 2 types are also ignored
  #

  		if ($line =~ /^\+/ && $length > $max_line_length) {
  			my $msg_type = "LONG_LINE";
  
  			# Check the allowed long line types first
  
  			# logging functions that end in a string that starts
  			# before $max_line_length
  			if ($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(?:KERN_\S+\s*|[^"]*))?($String\s*(?:|,|\)\s*;)\s*)$/ &&
  			    length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
  				$msg_type = "";
  
  			# lines with only strings (w/ possible termination)
  			# #defines with only strings
  			} elsif ($line =~ /^\+\s*$String\s*(?:\s*|,|\)\s*;)\s*$/ ||
  				 $line =~ /^\+\s*#\s*define\s+\w+\s+$String$/) {
  				$msg_type = "";

  			# More special cases
  			} elsif ($line =~ /^\+.*\bEFI_GUID\s*\(/ ||
  				 $line =~ /^\+\s*(?:\w+)?\s*DEFINE_PER_CPU/) {
  				$msg_type = "";
  
  			# URL ($rawline is used in case the URL is in a comment)
  			} elsif ($rawline =~ /^\+.*\b[a-z][\w\.\+\-]*:\/\/\S+/i) {

  				$msg_type = "";
  
  			# Otherwise set the alternate message types
  
  			# a comment starts before $max_line_length
  			} elsif ($line =~ /($;[\s$;]*)$/ &&
  				 length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
  				$msg_type = "LONG_LINE_COMMENT"
  
  			# a quoted string starts before $max_line_length
  			} elsif ($sline =~ /\s*($String(?:\s*(?:\\|,\s*|\)\s*;\s*))?)$/ &&
  				 length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) {
  				$msg_type = "LONG_LINE_STRING"

  			}

  			if ($msg_type ne "" &&
  			    (show_type("LONG_LINE") || show_type($msg_type))) {
  				WARN($msg_type,
  				     "line over $max_line_length characters
  " . $herecurr);
  			}

  		}
  
  # 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
  " . $herecurr);
  		}

  # check we are in a valid source file C or perl if not then ignore this hunk

  		next if ($realfile !~ /\.(h|c|pl|dtsi|dts)$/);

  
  # at the beginning of a line any tabs must come first and anything
  # more than 8 must use tabs.
  		if ($rawline =~ /^\+\s* \t\s*\S/ ||
  		    $rawline =~ /^\+\s*        \s*/) {
  			my $herevet = "$here
  " . cat_vet($rawline) . "
  ";

  			$rpt_cleaners = 1;

  			if (ERROR("CODE_INDENT",
  				  "code indent should use tabs where possible
  " . $herevet) &&
  			    $fix) {

  				$fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e;

  			}

  		}
  
  # check for space before tabs.
  		if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
  			my $herevet = "$here
  " . cat_vet($rawline) . "
  ";

  			if (WARN("SPACE_BEFORE_TAB",
  				"please, no space before tabs
  " . $herevet) &&
  			    $fix) {

  				while ($fixed[$fixlinenr] =~

  					   s/(^\+.*) {8,8}\t/$1\t\t/) {}

  				while ($fixed[$fixlinenr] =~

  					   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
  " . $hereprev);
  		}

  # check indentation starts on a tab stop
  		if ($^V && $^V ge 5.10.0 &&

  		    $sline =~ /^\+\t+( +)(?:$c90_Keywords\b|\{\s*$|\}\s*(?:else\b|while\b|\s*$)|$Declare\s*$Ident\s*[;=])/) {

  			my $indent = length($1);
  			if ($indent % 8) {
  				if (WARN("TABSTOP",
  					 "Statements should start on a tabstop
  " . $herecurr) &&
  				    $fix) {
  					$fixed[$fixlinenr] =~ s@(^\+\t+) +@$1 . "\t" x ($indent/8)@e;
  				}
  			}
  		}

  # 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*|(?:\*\s*)*$Lval\s*=\s*$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
  " . $hereprev) &&
  					    $fix && $line =~ /^\+/) {

  						$fixed[$fixlinenr] =~

  						    s/^\+[ \t]*/\+$goodtabindent/;
  					}

  				}
  			}
  		}

  # check for space after cast like "(int) foo" or "(struct foo) bar"
  # avoid checking a few false positives:
  #   "sizeof(<type>)" or "__alignof__(<type>)"
  #   function pointer declarations like "(*foo)(int) = bar;"
  #   structure definitions like "(struct foo) { 0 };"
  #   multiline macros that define functions
  #   known attributes or the __attribute__ keyword
  		if ($line =~ /^\+(.*)\(\s*$Type\s*\)([ \t]++)((?![={]|\\$|$Attribute|__attribute__))/ &&
  		    (!defined($1) || $1 !~ /\b(?:sizeof|__alignof__)\s*$/)) {

  			if (CHK("SPACING",

  				"No space is necessary after a cast
  " . $herecurr) &&

  			    $fix) {

  				$fixed[$fixlinenr] =~
  				    s/(\(\s*$Type\s*\))[ \t]+/$1/;

  			}

  		}

  # Block comment styles
  # Networking with an initial /*

  		if ($realfile =~ m@^(drivers/net/|net/)@ &&

  		    $prevrawline =~ /^\+[ \t]*\/\*[ \t]*$/ &&

  		    $rawline =~ /^\+[ \t]*\*/ &&
  		    $realline > 2) {

  			WARN("NETWORKING_BLOCK_COMMENT_STYLE",
  			     "networking block comments don't use an empty /* line, use /* Comment...
  " . $hereprev);
  		}

  # Block comments use * on subsequent lines
  		if ($prevline =~ /$;[ \t]*$/ &&			#ends in comment
  		    $prevrawline =~ /^\+.*?\/\*/ &&		#starting /*

  		    $prevrawline !~ /\*\/[ \t]*$/ &&		#no trailing */
  		    $rawline =~ /^\+/ &&			#line is new
  		    $rawline !~ /^\+[ \t]*\*/) {		#no leading *

  			WARN("BLOCK_COMMENT_STYLE",
  			     "Block comments use * on subsequent lines
  " . $hereprev);

  		}

  # Block comments use */ on trailing lines
  		if ($rawline !~ m@^\+[ \t]*\*/[ \t]*$@ &&	#trailing */

  		    $rawline !~ m@^\+.*/\*.*\*/[ \t]*$@ &&	#inline /*...*/
  		    $rawline !~ m@^\+.*\*{2,}/[ \t]*$@ &&	#trailing **/
  		    $rawline =~ m@^\+[ \t]*.+\*\/[ \t]*$@) {	#non blank */

  			WARN("BLOCK_COMMENT_STYLE",
  			     "Block comments use a trailing */ on a separate line
  " . $herecurr);
  		}
  
  # Block comment * alignment
  		if ($prevline =~ /$;[ \t]*$/ &&			#ends in comment
  		    $line =~ /^\+[ \t]*$;/ &&			#leading comment
  		    $rawline =~ /^\+[ \t]*\*/ &&		#leading *
  		    (($prevrawline =~ /^\+.*?\/\*/ &&		#leading /*
  		      $prevrawline !~ /\*\/[ \t]*$/) ||		#no trailing */
  		     $prevrawline =~ /^\+[ \t]*\*/)) {		#leading *
  			my $oldindent;
  			$prevrawline =~ m@^\+([ \t]*/?)\*@;
  			if (defined($1)) {
  				$oldindent = expand_tabs($1);
  			} else {
  				$prevrawline =~ m@^\+(.*/?)\*@;
  				$oldindent = expand_tabs($1);
  			}
  			$rawline =~ m@^\+([ \t]*)\*@;
  			my $newindent = $1;
  			$newindent = expand_tabs($newindent);
  			if (length($oldindent) ne length($newindent)) {
  				WARN("BLOCK_COMMENT_STYLE",
  				     "Block comments should align the * on each line
  " . $hereprev);
  			}
  		}
  
  # check for missing blank lines after struct/union declarations
  # with exceptions for various attributes and macros
  		if ($prevline =~ /^[\+ ]};?\s*$/ &&
  		    $line =~ /^\+/ &&
  		    !($line =~ /^\+\s*$/ ||
  		      $line =~ /^\+\s*EXPORT_SYMBOL/ ||
  		      $line =~ /^\+\s*MODULE_/i ||
  		      $line =~ /^\+\s*\#\s*(?:end|elif|else)/ ||
  		      $line =~ /^\+[a-z_]*init/ ||
  		      $line =~ /^\+\s*(?:static\s+)?[A-Z_]*ATTR/ ||
  		      $line =~ /^\+\s*DECLARE/ ||

  		      $line =~ /^\+\s*builtin_[\w_]*driver/ ||

  		      $line =~ /^\+\s*__setup/)) {
  			if (CHK("LINE_SPACING",
  				"Please use a blank line after function/struct/union/enum declarations
  " . $hereprev) &&
  			    $fix) {
  				fix_insert_line($fixlinenr, "\+");
  			}
  		}
  
  # check for multiple consecutive blank lines
  		if ($prevline =~ /^[\+ ]\s*$/ &&
  		    $line =~ /^\+\s*$/ &&
  		    $last_blank_line != ($linenr - 1)) {
  			if (CHK("LINE_SPACING",
  				"Please don't use multiple blank lines
  " . $hereprev) &&
  			    $fix) {
  				fix_delete_line($fixlinenr, $rawline);
  			}
  
  			$last_blank_line = $linenr;
  		}
  
  # check for missing blank lines after declarations
  		if ($sline =~ /^\+\s+\S/ &&			#Not at char 1
  			# actual declarations
  		    ($prevline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ ||
  			# function pointer declarations
  		     $prevline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\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*[=,;:\[]/ ||
  			# function pointer declarations
  		      $sline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\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/)) {
  			if (WARN("LINE_SPACING",
  				 "Missing a blank line after declarations
  " . $hereprev) &&
  			    $fix) {
  				fix_insert_line($fixlinenr, "\+");
  			}

  		}

  # check for spaces at the beginning of a line.
  # Exceptions:
  #  1) within comments
  #  2) indented preprocessor commands
  #  3) hanging labels

  		if ($rawline =~ /^\+ / && $line !~ /^\+ *(?:$;|#|$Ident:)/)  {

  			my $herevet = "$here
  " . cat_vet($rawline) . "
  ";

  			if (WARN("LEADING_SPACE",
  				 "please, no spaces at the start of a line
  " . $herevet) &&
  			    $fix) {

  				$fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e;

  			}

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

  # check for unusual line ending [ or (
  		if ($line =~ /^\+.*([\[\(])\s*$/) {
  			CHK("OPEN_ENDED_LINE",
  			    "Lines should not end with a '$1'
  " . $herecurr);
  		}

  # check if this appears to be the start function declaration, save the name
  		if ($sline =~ /^\+\{\s*$/ &&
  		    $prevline =~ /^\+(?:(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*)?($Ident)\(/) {
  			$context_function = $1;
  		}
  
  # check if this appears to be the end of function declaration
  		if ($sline =~ /^\+\}\s*$/) {
  			undef $context_function;
  		}
  
  # check indentation of any line with a bare else
  # (but not if it is a multiple line "if (foo) return bar; else return baz;")
  # if the previous line is a break or return and is indented 1 tab more...
  		if ($sline =~ /^\+([\t]+)(?:}[ \t]*)?else(?:[ \t]*{)?\s*$/) {
  			my $tabs = length($1) + 1;
  			if ($prevline =~ /^\+\t{$tabs,$tabs}break\b/ ||
  			    ($prevline =~ /^\+\t{$tabs,$tabs}return\b/ &&
  			     defined $lines[$linenr] &&
  			     $lines[$linenr] !~ /^[ \+]\t{$tabs,$tabs}return/)) {
  				WARN("UNNECESSARY_ELSE",
  				     "else is not generally useful after a break or return
  " . $hereprev);
  			}
  		}
  
  # check indentation of a line with a break;
  # if the previous line is a goto or return and is indented the same # of tabs
  		if ($sline =~ /^\+([\t]+)break\s*;\s*$/) {
  			my $tabs = $1;
  			if ($prevline =~ /^\+$tabs(?:goto|return)\b/) {
  				WARN("UNNECESSARY_BREAK",
  				     "break is not useful after a goto or return
  " . $hereprev);
  			}

  		}

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

  # check for old HOTPLUG __dev<foo> section markings
  		if ($line =~ /\b(__dev(init|exit)(data|const|))\b/) {
  			WARN("HOTPLUG_SECTION",
  			     "Using $1 is unnecessary
  " . $herecurr);
  		}

  # Check for potential 'bare' types
  		my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
  		    $realline_next);

  #print "LINE<$line>
  ";

  		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/
  ./
   /g;
  			$cond =~ s/
  ./
   /g;

  #print "linenr<$linenr> <$stat>
  ";
  			# 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>
  ";
  				$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
  ";
  					$sep = '';
  				} else {
  					$sep = "[...]
  ";
  				}
  			}
  			if ($err ne '') {
  				ERROR("SWITCH_CASE_INDENT_LEVEL",
  				      "switch and case should be at the same indent
  $hereline$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|(?:[a-z_]+|)for_each[a-z_]+)\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
  " . $herecurr);
  			}

  			my $ctx_cnt = $realcnt - $#ctx - 1;
  			my $ctx = join("
  ", @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>
  ";
  				$ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
  				$ctx_ln++;
  			}
  
  			#print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>
  ";
  			#print "pre<$pre_ctx>
  line<$line>
  ctx<$ctx>
  next<$lines[$ctx_ln - 1]>
  ";

  			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
  " .
  					"$here
  $ctx
  $rawlines[$ctx_ln - 1]
  ");
  			}
  			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 > $indent) {
  					WARN("TRAILING_SEMICOLON",
  					     "trailing semicolon indicates no statements, indent implies otherwise
  " .
  						"$here
  $ctx
  $rawlines[$ctx_ln - 1]
  ");
  				}
  			}
  		}
  
  # Check relative indent for conditionals and blocks.

  		if ($line =~ /\b(?:(?:if|while|for|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|(?:do|else)\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), '');

  			# remove inline comments
  			$s =~ s/$;/ /g;
  			$c =~ s/$;/ /g;

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

  			# Make sure we remove the line prefixes as we have
  			# none on the first line, and are going to readd them
  			# where necessary.
  			$s =~ s/
  ./
  /gs;
  			while ($s =~ /
  \s+\\
  /) {
  				$cond_lines += $s =~ s/
  \s+\\
  /
  /g;
  			}

  			# 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*?
  //) {
  				$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*?
  / ||
  				    $s =~ /^\s*#\s*?/ ||
  				    $s =~ /^\s*$Ident\s*:/) {
  					$continuation = ($s =~ /^.*?\\
  /) ? 1 : 0;
  					if ($s =~ s/^.*?
  //) {
  						$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 = "[...]
  $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>
  ";

  			if ($check && $s ne '' &&
  			    (($sindent % 8) != 0 ||
  			     ($sindent < $indent) ||
  			     ($sindent == $indent &&
  			      ($s !~ /^\s*(?:\}|\{|else\b)/)) ||
  			     ($sindent > $indent + 8))) {

  				WARN("SUSPECT_CODE_INDENT",
  				     "suspect code indent for conditional statements ($indent, $sindent)
  " . $herecurr . "$stat_real
  ");
  			}
  		}
  
  		# Track the 'values' across context and added lines.
  		my $opline = $line; $opline =~ s/^./ /;
  		my ($curr_values, $curr_vars) =
  				annotate_values($opline . "
  ", $prev_values);
  		$curr_values = $prev_values . $curr_values;
  		if ($dbg_values) {
  			my $outline = $opline; $outline =~ s/\t/ /g;
  			print "$linenr > .$outline
  ";
  			print "$linenr > $curr_values
  ";
  			print "$linenr >  $curr_vars
  ";
  		}
  		$prev_values = substr($curr_values, -1);
  
  #ignore lines not being added

  		next if ($line =~ /^[^\+]/);

  # check for dereferences that span multiple lines
  		if ($prevline =~ /^\+.*$Lval\s*(?:\.|->)\s*$/ &&
  		    $line =~ /^\+\s*(?!\#\s*(?!define\s+|if))\s*$Lval/) {
  			$prevline =~ /($Lval\s*(?:\.|->))\s*$/;
  			my $ref = $1;
  			$line =~ /^.\s*($Lval)/;
  			$ref .= $1;
  			$ref =~ s/\s//g;
  			WARN("MULTILINE_DEREFERENCE",
  			     "Avoid multiple line dereference - prefer '$ref'
  " . $hereprev);
  		}
  
  # check for declarations of signed or unsigned without int
  		while ($line =~ m{\b($Declare)\s*(?!char\b|short\b|int\b|long\b)\s*($Ident)?\s*[=,;\[\)\(]}g) {
  			my $type = $1;
  			my $var = $2;
  			$var = "" if (!defined $var);
  			if ($type =~ /^(?:(?:$Storage|$Inline|$Attribute)\s+)*((?:un)?signed)((?:\s*\*)*)\s*$/) {
  				my $sign = $1;
  				my $pointer = $2;
  
  				$pointer = "" if (!defined $pointer);
  
  				if (WARN("UNSPECIFIED_INT",
  					 "Prefer '" . trim($sign) . " int" . rtrim($pointer) . "' to bare use of '$sign" . rtrim($pointer) . "'
  " . $herecurr) &&
  				    $fix) {
  					my $decl = trim($sign) . " int ";
  					my $comp_pointer = $pointer;
  					$comp_pointer =~ s/\s//g;
  					$decl .= $comp_pointer;
  					$decl = rtrim($decl) if ($var eq "");
  					$fixed[$fixlinenr] =~ s@\b$sign\s*\Q$pointer\E\s*$var\b@$decl$var@;
  				}
  			}
  		}

  # TEST: allow direct testing of the type matcher.
  		if ($dbg_type) {
  			if ($line =~ /^.\s*$Declare\s*$/) {
  				ERROR("TEST_TYPE",
  				      "TEST: is type
  " . $herecurr);
  			} elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
  				ERROR("TEST_NOT_TYPE",
  				      "TEST: is not type ($1 is)
  ". $herecurr);
  			}
  			next;
  		}
  # TEST: allow direct testing of the attribute matcher.
  		if ($dbg_attr) {
  			if ($line =~ /^.\s*$Modifier\s*$/) {
  				ERROR("TEST_ATTR",
  				      "TEST: is attr
  " . $herecurr);
  			} elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
  				ERROR("TEST_NOT_ATTR",
  				      "TEST: is not attr ($1 is)
  ". $herecurr);
  			}
  			next;
  		}
  
  # check for initialisation to aggregates open brace on the next line
  		if ($line =~ /^.\s*{/ &&
  		    $prevline =~ /(?:^|[^=])=\s*$/) {

  			if (ERROR("OPEN_BRACE",
  				  "that open brace { should be on the previous line
  " . $hereprev) &&
  			    $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
  				fix_delete_line($fixlinenr - 1, $prevrawline);
  				fix_delete_line($fixlinenr, $rawline);
  				my $fixedline = $prevrawline;
  				$fixedline =~ s/\s*=\s*$/ = {/;
  				fix_insert_line($fixlinenr, $fixedline);
  				$fixedline = $line;
  				$fixedline =~ s/^(.\s*)\{\s*/$1/;
  				fix_insert_line($fixlinenr, $fixedline);
  			}

  		}
  
  #
  # 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
  " . $herecurr);
  			}
  			if ($path =~ "^uapi/" && $realfile =~ m@\binclude/uapi/@) {
  				ERROR("UAPI_INCLUDE",
  				      "No #include in ...include/uapi/... should use a uapi/ path prefix
  " . $herecurr);

  			}
  		}
  
  # no C99 // comments
  		if ($line =~ m{//}) {

  			if (ERROR("C99_COMMENTS",
  				  "do not use C99 // comments
  " . $herecurr) &&
  			    $fix) {

  				my $line = $fixed[$fixlinenr];

  				if ($line =~ /\/\/(.*)$/) {
  					my $comment = trim($1);

  					$fixed[$fixlinenr] =~ 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]>
  ";
  		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*
  )?.([A-Z_]+)\s*\(\s*($Ident)/ &&

  			    $name =~ /^${Ident}_$2/) {
  #print "FOO C name<$name>
  ";
  				$suppress_export{$realline_next} = 1;
  
  			} elsif ($stat !~ /(?:
  				
  .}\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>
  ";
  				$suppress_export{$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]>
  ";
  			$suppress_export{$linenr} = 2;
  		}
  		if (defined $suppress_export{$linenr} &&
  		    $suppress_export{$linenr} == 2) {
  			WARN("EXPORT_SYMBOL",
  			     "EXPORT_SYMBOL(foo); should immediately follow its function/variable
  " . $herecurr);
  		}
  
  # check for global initialisers.

  		if ($line =~ /^\+$Type\s*$Ident(?:\s+$Modifier)*\s*=\s*($zero_initializer)\s*;/) {

  			if (ERROR("GLOBAL_INITIALISERS",

  				  "do not initialise globals to $1
  " . $herecurr) &&

  			    $fix) {

  				$fixed[$fixlinenr] =~ s/(^.$Type\s*$Ident(?:\s+$Modifier)*)\s*=\s*$zero_initializer\s*;/$1;/;

  			}

  		}
  # check for static initialisers.

  		if ($line =~ /^\+.*\bstatic\s.*=\s*($zero_initializer)\s*;/) {

  			if (ERROR("INITIALISED_STATIC",

  				  "do not initialise statics to $1
  " .

  				      $herecurr) &&
  			    $fix) {

  				$fixed[$fixlinenr] =~ s/(\bstatic\s.*?)\s*=\s*$zero_initializer\s*;/$1;/;

  			}

  		}

  # check for misordered declarations of char/short/int/long with signed/unsigned
  		while ($sline =~ m{(\b$TypeMisordered\b)}g) {
  			my $tmp = trim($1);
  			WARN("MISORDERED_TYPE",
  			     "type '$tmp' should be specified in [[un]signed] [short|int|long|long long] order
  " . $herecurr);
  		}

  # 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
  " .
  				$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
  " .
  				$herecurr);
                 }

  # check for const <foo> const where <foo> is not a pointer or array type
  		if ($sline =~ /\bconst\s+($BasicType)\s+const\b/) {
  			my $found = $1;
  			if ($sline =~ /\bconst\s+\Q$found\E\s+const\b\s*\*/) {
  				WARN("CONST_CONST",
  				     "'const $found const *' should probably be 'const $found * const'
  " . $herecurr);
  			} elsif ($sline !~ /\bconst\s+\Q$found\E\s+const\s+\w+\s*\[/) {
  				WARN("CONST_CONST",
  				     "'const $found const' should probably be 'const $found'
  " . $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
  " .
  				$herecurr);
                 }
  
  # check for sizeof(foo)/sizeof(foo[0]) that could be ARRAY_SIZE(foo)
  		if ($line =~ m@\bsizeof\s*\(\s*($Lval)\s*\)@) {
  			my $array = $1;
  			if ($line =~ m@\b(sizeof\s*\(\s*\Q$array\E\s*\)\s*/\s*sizeof\s*\(\s*\Q$array\E\s*\[\s*0\s*\]\s*\))@) {
  				my $array_div = $1;
  				if (WARN("ARRAY_SIZE",
  					 "Prefer ARRAY_SIZE($array)
  " . $herecurr) &&
  				    $fix) {
  					$fixed[$fixlinenr] =~ s/\Q$array_div\E/ARRAY_SIZE($array)/;
  				}
  			}
  		}

  # 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)
  " . $herecurr) &&
  			    $fix) {

  				$fixed[$fixlinenr] =~ 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
  " . $herecurr);
  		}
  
  # * goes on variable not on type
  		# (char*[ const])

  		while ($line =~ m{(\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\))}g) {
  			#print "AA<$1>
  ";

  			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>
  ";

  			if ($from ne $to) {

  				if (ERROR("POINTER_LOCATION",
  					  "\"(foo$from)\" should be \"(foo$to)\"
  " .  $herecurr) &&
  				    $fix) {
  					my $sub_from = $ident;
  					my $sub_to = $ident;
  					$sub_to =~ s/\Q$from\E/$to/;

  					$fixed[$fixlinenr] =~

  					    s@\Q$sub_from\E@$sub_to@;
  				}

  			}

  		}
  		while ($line =~ m{(\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident))}g) {
  			#print "BB<$1>
  ";

  			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>
  ";

  			if ($from ne $to && $ident !~ /^$Modifier$/) {

  				if (ERROR("POINTER_LOCATION",
  					  "\"foo${from}bar\" should be \"foo${to}bar\"
  " .  $herecurr) &&
  				    $fix) {
  
  					my $sub_from = $match;
  					my $sub_to = $match;
  					$sub_to =~ s/\Q$from\E/$to/;

  					$fixed[$fixlinenr] =~

  					    s@\Q$sub_from\E@$sub_to@;
  				}

  			}
  		}

  # avoid BUG() or BUG_ON()
  		if ($line =~ /\b(?:BUG|BUG_ON)\b/) {

  			my $msg_level = \&WARN;
  			$msg_level = \&CHK if ($file);
  			&{$msg_level}("AVOID_BUG",
  				      "Avoid crashing the kernel - try using WARN_ON & recovery code rather than BUG() or BUG_ON()
  " . $herecurr);

  		}

  # avoid LINUX_VERSION_CODE

  		if ($line =~ /\bLINUX_VERSION_CODE\b/) {
  			WARN("LINUX_VERSION_CODE",
  			     "LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged
  " . $herecurr);
  		}
  
  # check for uses of printk_ratelimit
  		if ($line =~ /\bprintk_ratelimit\s*\(/) {
  			WARN("PRINTK_RATELIMITED",

  			     "Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit
  " . $herecurr);

  		}

  # printk should use KERN_* levels
  		if ($line =~ /\bprintk\s*\(\s*(?!KERN_[A-Z]+\b)/) {
  			WARN("PRINTK_WITHOUT_KERN_LEVEL",
  			     "printk() should include KERN_<LEVEL> facility level
  " . $herecurr);

  		}

  		if ($line =~ /\bprintk\s*\(\s*KERN_([A-Z]+)/) {
  			my $orig = $1;
  			my $level = lc($orig);
  			$level = "warn" if ($level eq "warning");
  			my $level2 = $level;
  			$level2 = "dbg" if ($level eq "debug");
  			WARN("PREFER_PR_LEVEL",

  			     "Prefer [subsystem eg: netdev]_$level2([subsystem]dev, ... then dev_$level2(dev, ... then pr_$level(...  to printk(KERN_$orig ...
  " . $herecurr);

  		}
  
  		if ($line =~ /\bpr_warning\s*\(/) {

  			if (WARN("PREFER_PR_LEVEL",
  				 "Prefer pr_warn(... to pr_warning(...
  " . $herecurr) &&
  			    $fix) {

  				$fixed[$fixlinenr] =~

  				    s/\bpr_warning\b/pr_warn/;
  			}

  		}
  
  		if ($line =~ /\bdev_printk\s*\(\s*KERN_([A-Z]+)/) {
  			my $orig = $1;
  			my $level = lc($orig);
  			$level = "warn" if ($level eq "warning");
  			$level = "dbg" if ($level eq "debug");
  			WARN("PREFER_DEV_LEVEL",
  			     "Prefer dev_$level(... to dev_printk(KERN_$orig, ...
  " . $herecurr);
  		}

  # ENOSYS means "bad syscall nr" and nothing else.  This will have a small
  # number of false positives, but assembly files are not checked, so at
  # least the arch entry code will not trigger this warning.
  		if ($line =~ /\bENOSYS\b/) {
  			WARN("ENOSYS",
  			     "ENOSYS means 'invalid syscall nr' and nothing else
  " . $herecurr);
  		}

  # function brace can't be on same line, except for #defines of do while,
  # or if closed on same line

  		if ($^V && $^V ge 5.10.0 &&
  		    $sline =~ /$Type\s*$Ident\s*$balanced_parens\s*\{/ &&
  		    $sline !~ /\#\s*define\b.*do\s*\{/ &&
  		    $sline !~ /}/) {

  			if (ERROR("OPEN_BRACE",

  				  "open brace '{' following function definitions go on the next line
  " . $herecurr) &&

  			    $fix) {
  				fix_delete_line($fixlinenr, $rawline);
  				my $fixed_line = $rawline;
  				$fixed_line =~ /(^..*$Type\s*$Ident\(.*\)\s*){(.*)$/;
  				my $line1 = $1;
  				my $line2 = $2;
  				fix_insert_line($fixlinenr, ltrim($line1));
  				fix_insert_line($fixlinenr, "\+{");
  				if ($line2 !~ /^\s*$/) {
  					fix_insert_line($fixlinenr, "\+\t" . trim($line2));
  				}
  			}

  		}
  
  # 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*$/) {

  			if (ERROR("OPEN_BRACE",
  				  "open brace '{' following $1 go on the same line
  " . $hereprev) &&
  			    $fix && $prevline =~ /^\+/ && $line =~ /^\+/) {
  				fix_delete_line($fixlinenr - 1, $prevrawline);
  				fix_delete_line($fixlinenr, $rawline);
  				my $fixedline = rtrim($prevrawline) . " {";
  				fix_insert_line($fixlinenr, $fixedline);
  				$fixedline = $rawline;
  				$fixedline =~ s/^(.\s*)\{\s*/$1\t/;
  				if ($fixedline !~ /^\+\s*$/) {
  					fix_insert_line($fixlinenr, $fixedline);
  				}
  			}

  		}
  
  # 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
  " . $herecurr) &&
  			    $fix) {

  				$fixed[$fixlinenr] =~

  				    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
  " . $herecurr);

  				$post_declare_space = " ";

  			}
  
  # unnecessary space "type  (*funcptr)(args...)"

  # This test is not currently implemented because these declarations are
  # equivalent to
  #	int  foo(int bar, ...)
  # and this is form shouldn't/doesn't generate a checkpatch warning.
  #
  #			elsif ($declare =~ /\s{2,}$/) {
  #				WARN("SPACING",
  #				     "Multiple spaces after return type
  " . $herecurr);
  #			}

  
  # unnecessary space "type ( *funcptr)(args...)"
  			if (defined $pre_pointer_space &&
  			    $pre_pointer_space =~ /^\s/) {
  				WARN("SPACING",
  				     "Unnecessary space after function pointer open parenthesis
  " . $herecurr);
  			}
  
  # unnecessary space "type (* funcptr)(args...)"
  			if (defined $post_pointer_space &&
  			    $post_pointer_space =~ /^\s/) {
  				WARN("SPACING",
  				     "Unnecessary space before function pointer name
  " . $herecurr);
  			}
  
  # unnecessary space "type (*funcptr )(args...)"
  			if (defined $post_funcname_space &&
  			    $post_funcname_space =~ /^\s/) {
  				WARN("SPACING",
  				     "Unnecessary space after function pointer name
  " . $herecurr);
  			}
  
  # unnecessary space "type (*funcptr) (args...)"
  			if (defined $pre_args_space &&
  			    $pre_args_space =~ /^\s/) {
  				WARN("SPACING",
  				     "Unnecessary space before function pointer arguments
  " . $herecurr);
  			}
  
  			if (show_type("SPACING") && $fix) {

  				$fixed[$fixlinenr] =~
  				    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 '['
  " . $herecurr) &&
  				    $fix) {

  				    $fixed[$fixlinenr] =~

  					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 '('
  " . $herecurr) &&
  					     $fix) {

  					$fixed[$fixlinenr] =~

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

  				$off += length($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
  ";
  
  				# 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
  " . $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
  " . $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 not have a space before and must have a space on the right.

  				} elsif ($op eq ',') {

  					my $rtrim_before = 0;
  					my $space_after = 0;
  					if ($ctx =~ /Wx./) {
  						if (ERROR("SPACING",
  							  "space prohibited before that '$op' $at
  " . $hereptr)) {
  							$line_fixed = 1;
  							$rtrim_before = 1;
  						}
  					}

  					if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {

  						if (ERROR("SPACING",
  							  "space required after that '$op' $at
  " . $hereptr)) {

  							$line_fixed = 1;
  							$last_after = $n;

  							$space_after = 1;
  						}
  					}
  					if ($rtrim_before || $space_after) {
  						if ($rtrim_before) {
  							$good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]);
  						} else {
  							$good = $fix_elements[$n] . trim($fix_elements[$n + 1]);
  						}
  						if ($space_after) {
  							$good .= " ";

  						}

  					}
  
  				# '*' as part of a type definition -- reported already.
  				} elsif ($opv eq '*_') {
  					#warn "'*' is part of type
  ";
  
  				# 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
  " . $hereptr)) {
  							if ($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
  " . $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
  " . $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
  " . $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
  " . $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 ($check) {
  						if (defined $fix_elements[$n + 2] && $ctx !~ /[EW]x[EW]/) {
  							if (CHK("SPACING",
  								"spaces preferred around that '$op' $at
  " . $hereptr)) {
  								$good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " ";
  								$fix_elements[$n + 2] =~ s/^\s+//;
  								$line_fixed = 1;
  							}
  						} elsif (!defined $fix_elements[$n + 2] && $ctx !~ /Wx[OE]/) {
  							if (CHK("SPACING",
  								"space preferred before that '$op' $at
  " . $hereptr)) {
  								$good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]);
  								$line_fixed = 1;
  							}
  						}
  					} elsif ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {

  						if (ERROR("SPACING",
  							  "need consistent spacing around '$op' $at
  " . $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
  " . $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;

  					}

  					# for asm volatile statements
  					# ignore a colon with another
  					# colon immediately before or after
  					if (($op eq ':') &&
  					    ($ca =~ /:$/ || $cc =~ /^:/)) {
  						$ok = 1;
  					}

  					# messages are ERROR, but ?: are CHK