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

use strict;

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

my $V = '0.31';

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

my $quiet = 0;
my $tree = 1;
my $chk_signoff = 1;
my $chk_patch = 1;
my $tst_only;
my $emacs = 0;
my $terse = 0;
my $file = 0;
my $check = 0;
my $summary = 1;
my $mailback = 0;
my $summary_file = 0;
my $root;
my %debug;
my $help = 0;

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
  -f, --file                 treat FILE as regular source file
  --subjective, --strict     enable more subjective tests
  --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
  -h, --help, --version      display this help and exit

When FILE is - read standard input.
EOM

        exit($exitcode);
}

GetOptions(
        'q|quiet+'      => \$quiet,
        'tree!'         => \$tree,
        'signoff!'      => \$chk_signoff,
        'patch!'        => \$chk_patch,
        'emacs!'        => \$emacs,
        'terse!'        => \$terse,
        'f|file!'       => \$file,
        'subjective!'   => \$check,
        'strict!'       => \$check,
        'root=s'        => \$root,
        'summary!'      => \$summary,
        'mailback!'     => \$mailback,
        'summary-file!' => \$summary_file,

        'debug=s'       => \%debug,
        'test-only=s'   => \$tst_only,
        'h|help'        => \$help,
        'version'       => \$help
) or help(1);

help(0) if ($help);

my $exit = 0;

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

my $dbg_values = 0;
my $dbg_possible = 0;
my $dbg_type = 0;
my $dbg_attr = 0;
my $dbg_adv_dcs = 0;
my $dbg_adv_checking = 0;
my $dbg_adv_apw = 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\n";
                }
        } 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\n";
                exit(2);
        }
}

my $emitted_corrupt = 0;

our $Ident      = qr{
                        [A-Za-z_][A-Za-z\d_]*
                        (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
                }x;
our $Storage    = qr{extern|static|asmlinkage};
our $Sparse     = qr{
                        __force
                }x;

# Notes to $Attribute:
our $Attribute  = qr{
                        const|
                        volatile|
                        QEMU_NORETURN|
                        QEMU_WARN_UNUSED_RESULT|
                        QEMU_SENTINEL|
                        QEMU_ARTIFICIAL|
                        QEMU_PACKED|
                        GCC_FMT_ATTR
                  }x;
our $Modifier;
our $Inline     = qr{inline};
our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
our $Lval       = qr{$Ident(?:$Member)*};

our $Constant   = qr{(?:[0-9]+|0x[0-9a-fA-F]+)[UL]*};
our $Assignment = qr{(?:\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=)};
our $Compare    = qr{<=|>=|==|!=|<|>};
our $Operators  = qr{
                        <=|>=|==|!=|
                        =>|->|<<|>>|<|>|!|~|
                        &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%
                  }x;

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

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

# There are still some false positives, but this catches most
# common cases.
our $typeTypedefs = qr{(?x:
        [A-Z][A-Z\d_]*[a-z][A-Za-z\d_]*     # camelcase
        | [A-Z][A-Z\d_]*AIOCB               # all uppercase
        | [A-Z][A-Z\d_]*CPU                 # all uppercase
        | QEMUBH                            # all uppercase
)};

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

# This can be modified by sub possible.  Since it can be empty, be careful
# about regexes that always match, because they can cause infinite loops.
our @modifierList = (
);

sub build_types {
        my $all = "(?x:  \n" . join("|\n  ", @typeList) . "\n)";
        if (@modifierList > 0) {
                my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
                $Modifier = qr{(?:$Attribute|$Sparse|$mods)};
        } else {
                $Modifier = qr{(?:$Attribute|$Sparse)};
        }
        $NonptrType     = qr{
                        (?:$Modifier\s+|const\s+)*
                        (?:
                                (?:typeof|__typeof__)\s*\(\s*\**\s*$Ident\s*\)|
                                (?:$typeTypedefs\b)|
                                (?:${all}\b)
                        )
                        (?:\s+$Modifier|\s+const)*
                  }x;
        $Type   = qr{
                        $NonptrType
                        (?:[\s\*]+\s*const|[\s\*]+|(?:\s*\[\s*\])+)?
                        (?:\s+$Inline|\s+$Modifier)*
                  }x;
        $Declare        = qr{(?:$Storage\s+)?$Type};
}
build_types();

$chk_signoff = 0 if ($file);

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

exit($exit);

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

        my @tree_check = (
                "COPYING", "MAINTAINERS", "Makefile",
                "README", "docs", "VERSION",
                "vl.c"
        );

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

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

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

        return $res;
}
sub copy_spacing {
        (my $res = shift) =~ tr/\t/ /c;
        return $res;
}

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

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

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

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

my $sanitise_quote = '';

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

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

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

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

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

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

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

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

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

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

        return $res;
}

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

        my $loff = 0;

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

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

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

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

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

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

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

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

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

                        if ($level == 0) {
                                if (substr($blk, $off + 1, 1) eq ';') {
                                        $off++;
                                }
                                last;
                        }
                }
                $off++;
        }
        # We are truly at the end, so shuffle to the next line.
        if ($off == $len) {
                $loff = $len + 1;
                $line++;
                $remain--;
        }

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

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

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

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

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

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

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

        return $#stmt_lines + 2;
}

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

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

        return $#stmt_lines + 2;
}

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

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

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

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

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

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

        my (@chunks);

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

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

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

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

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

                $blk .= $rawlines[$line];

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

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

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

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

                last if ($level == 0);
        }

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

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

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

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

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

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

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

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

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

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

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

        return ($cmt ne '');
}

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

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

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

        return $line;
}

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

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

        return $res;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

                        $type = 'E';

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

                        $av_preprocessor = 1;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        return ($res, $var);
}

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

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

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

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

my $prefix = '';

sub report {
        if (defined $tst_only && $_[0] !~ /\Q$tst_only\E/) {
                return 0;
        }
        my $line = $prefix . $_[0];

        $line = (split('\n', $line))[0] . "\n" if ($terse);

        push(our @report, $line);

        return 1;
}
sub report_dump {
        our @report;
}
sub ERROR {
        if (report("ERROR: $_[0]\n")) {
                our $clean = 0;
                our $cnt_error++;
        }
}
sub WARN {
        if (report("WARNING: $_[0]\n")) {
                our $clean = 0;
                our $cnt_warn++;
        }
}
sub CHK {
        if ($check && report("CHECK: $_[0]\n")) {
                our $clean = 0;
                our $cnt_chk++;
        }
}

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;

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

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

        my $prev_values = 'E';

        # suppression flags
        my %suppress_ifbraces;
        my %suppress_whiletrailers;
        my %suppress_export;

        # Pre-scan the patch sanitizing the lines.

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

                if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
                        $realline=$1-1;
                        if (defined $2) {
                                $realcnt=$3+1;
                        } else {
                                $realcnt=1+1;
                        }
                        $in_comment = 0;

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

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

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

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

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

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

        $prefix = '';

        $realcnt = 0;
        $linenr = 0;
        foreach my $line (@lines) {
                $linenr++;

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

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

                        %suppress_ifbraces = ();
                        %suppress_whiletrailers = ();
                        %suppress_export = ();
                        next;

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

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

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

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

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

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

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

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

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

                } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
                        $realfile = $1;
                        $realfile =~ s@^([^/]*)/@@;

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

                        next;
                }

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

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

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

# Check for incorrect file permissions
                if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
                        my $permhere = $here . "FILE: $realfile\n";
                        if ($realfile =~ /(\bMakefile(?:\.objs)?|\.c|\.cc|\.cpp|\.h|\.mak|\.[sS])$/) {
                                ERROR("do not set execute permissions for source files\n" . $permhere);
                        }
                }

#check the patch for a signoff:
                if ($line =~ /^\s*signed-off-by:/i) {
                        # This is a signoff, if ugly, so do not double report.
                        $signoff++;
                        if (!($line =~ /^\s*Signed-off-by:/)) {
                                WARN("Signed-off-by: is the preferred form\n" .
                                        $herecurr);
                        }
                        if ($line =~ /^\s*signed-off-by:\S/i) {
                                WARN("space required after Signed-off-by:\n" .
                                        $herecurr);
                        }
                }

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

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

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

#trailing whitespace
                if ($line =~ /^\+.*\015/) {
                        my $herevet = "$here\n" . cat_vet($rawline) . "\n";
                        ERROR("DOS line endings\n" . $herevet);

                } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
                        my $herevet = "$here\n" . cat_vet($rawline) . "\n";
                        ERROR("trailing whitespace\n" . $herevet);
                        $rpt_cleaners = 1;
                }

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

#80 column limit
                if ($line =~ /^\+/ &&
                    !($line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
                    $length > 80)
                {
                        WARN("line over 80 characters\n" . $herecurr);
                }

# check for spaces before a quoted newline
                if ($rawline =~ /^.*\".*\s\\n/) {
                        WARN("unnecessary whitespace before a quoted newline\n" . $herecurr);
                }

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

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

# in QEMU, no tabs are allowed
                if ($rawline =~ /^\+.*\t/) {
                        my $herevet = "$here\n" . cat_vet($rawline) . "\n";
                        ERROR("code indent should never use tabs\n" . $herevet);
                        $rpt_cleaners = 1;
                }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

                }

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

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

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

                        my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
                        my $ctx_cnt = $realcnt - $#ctx - 1;
                        my $ctx = join("\n", @ctx);

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

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

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

                        # The length of the "previous line" is checked against 80 because it
                        # includes the + at the beginning of the line (if the actual line has
                        # 79 or 80 characters, it is no longer possible to add a space and an
                        # opening brace there)
                        if ($#ctx == 0 && $ctx !~ /{\s*/ &&
                            defined($lines[$ctx_ln - 1]) && $lines[$ctx_ln - 1] =~ /^\+\s*\{/ &&
                            defined($lines[$ctx_ln - 2]) && length($lines[$ctx_ln - 2]) < 80) {
                                ERROR("that open brace { should be on the previous line\n" .
                                        "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
                        }
                        if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
                            $ctx =~ /\)\s*\;\s*$/ &&
                            defined $lines[$ctx_ln - 1])
                        {
                                my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
                                if ($nindent > $indent) {
                                        WARN("trailing semicolon indicates no statements, indent implies otherwise\n" .
                                                "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
                                }
                        }
                }

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

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

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

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

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

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

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

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

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

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

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

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

                        if ($check && (($sindent % 4) != 0 ||
                            ($sindent <= $indent && $s ne ''))) {
                                WARN("suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
                        }
                }

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

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

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

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

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

# check for malformed paths in #include statements (uses RAW line)
                if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
                        my $path = $1;
                        if ($path =~ m{//}) {
                                ERROR("malformed #include filename\n" .
                                        $herecurr);
                        }
                }

# no C99 // comments
                if ($line =~ m{//}) {
                        ERROR("do not use C99 // comments\n" . $herecurr);
                }
                # Remove C99 comments.
                $line =~ s@//.*@@;
                $opline =~ s@//.*@@;

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

# * goes on variable not on type
                # (char*[ const])
                if ($line =~ m{\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\)}) {
                        my ($from, $to) = ($1, $1);

                        # 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 "from<$from> to<$to>\n";
                        if ($from ne $to) {
                                ERROR("\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr);
                        }
                } elsif ($line =~ m{\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident)}) {
                        my ($from, $to, $ident) = ($1, $1, $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+\*/\*\*/) {
                        }
                        # Modifiers should have spaces.
                        $to =~ s/(\b$Modifier$)/$1 /;

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

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

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

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

# 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 }
#  4. after a comma -- [1] = 5, [2] = 6
#  5. in a macro definition -- #define abc(x) [x] = y
                while ($line =~ /(.*?\s)\[/g) {
                        my ($where, $prefix) = ($-[1], $1);
                        if ($prefix !~ /$Type\s+$/ &&
                            ($where != 0 || $prefix !~ /^.\s+$/) &&
                            $prefix !~ /{\s+$/ &&
                            $prefix !~ /\#\s*define[^(]*\([^)]*\)\s+$/ &&
                            $prefix !~ /,\s+$/) {
                                ERROR("space prohibited before open square bracket '['\n" . $herecurr);
                        }
                }

# 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)
                        {

                        # Ignore 'catch (...)' in C++
                        } elsif ($name =~ /^catch$/ && $realfile =~ /(\.cpp|\.h)$/) {

                        # 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 {
                                WARN("space prohibited between function name and open parenthesis '('\n" . $herecurr);
                        }
                }
# Check operator spacing.
                if (!($line=~/\#\s*include/)) {
                        my $ops = qr{
                                <<=|>>=|<=|>=|==|!=|
                                \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
                                =>|->|<<|>>|<|>|=|!|~|
                                &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
                                \?|::|:
                        }x;
                        my @elements = split(/($ops|;)/, $opline);
                        my $off = 0;

                        my $blank = copy_spacing($opline);

                        for (my $n = 0; $n < $#elements; $n += 2) {
                                $off += length($elements[$n]);

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

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

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

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

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

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

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

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

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

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

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

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

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

                                # Ignore : used in class declaration in C++
                                } elsif ($opv eq ':B' && $ctx =~ /Wx[WE]/ &&
                                                 $line =~ /class/ && $realfile =~ /(\.cpp|\.h)$/) {

                                # No spaces for:
                                #   ->
                                #   :   when part of a bitfield
                                } elsif ($op eq '->' || $opv eq ':B') {
                                        if ($ctx =~ /Wx.|.xW/) {
                                                ERROR("spaces prohibited around that '$op' $at\n" . $hereptr);
                                        }

                                # , must have a space on the right.
                                # not required when having a single },{ on one line
                                } elsif ($op eq ',') {
                                        if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/ &&
                                            ($elements[$n] . $elements[$n + 2]) !~ " *}\\{") {
                                                ERROR("space required after that '$op' $at\n" . $hereptr);
                                        }

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

                                # unary operators should have a space before and
                                # none after.  May be left adjacent to another
                                # unary operator, or a cast
                                } elsif ($op eq '!' || $op eq '~' ||
                                         $opv eq '*U' || $opv eq '-U' ||
                                         $opv eq '&U' || $opv eq '&&U') {
                                        if ($op eq '~' && $ca =~ /::$/ && $realfile =~ /(\.cpp|\.h)$/) {
                                                # '~' used as a name of Destructor

                                        } elsif ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
                                                ERROR("space required before that '$op' $at\n" . $hereptr);
                                        }
                                        if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
                                                # A unary '*' may be const

                                        } elsif ($ctx =~ /.xW/) {
                                                ERROR("space prohibited after that '$op' $at\n" . $hereptr);
                                        }

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

                                # 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./) {
                                                ERROR("space prohibited before that '$op' $at\n" . $hereptr);
                                        }

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

                                        if ($realfile =~ /\.cpp|\.h$/) {
                                                # Ignore template arguments <...> in C++
                                                if (($op eq '<' || $op eq '>') && $line =~ /<.*>/) {
                                                        $ok = 1;
                                                }

                                                # Ignore :: in C++
                                                if ($op eq '::') {
                                                        $ok = 1;
                                                }
                                        }

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

                                        # Ignore ?:
                                        if (($opv eq ':O' && $ca =~ /\?$/) ||
                                            ($op eq '?' && $cc =~ /^:/)) {
                                                $ok = 1;
                                        }

                                        if ($ok == 0) {
                                                ERROR("spaces required around that '$op' $at\n" . $hereptr);
                                        }
                                }
                                $off += length($elements[$n + 1]);
                        }
                }

#need space before brace following if, while, etc
                if (($line =~ /\(.*\)\{/ && $line !~ /\($Type\)\{/) ||
                    $line =~ /do\{/) {
                        ERROR("space required before the open brace '{'\n" . $herecurr);
                }

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

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

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

# Return is not a function.
                if (defined($stat) && $stat =~ /^.\s*return(\s*)(\(.*);/s) {
                        my $spacing = $1;
                        my $value = $2;

                        # Flatten any parentheses
                        $value =~ s/\(/ \(/g;
                        $value =~ s/\)/\) /g;
                        while ($value =~ s/\[[^\{\}]*\]/1/ ||
                               $value !~ /(?:$Ident|-?$Constant)\s*
                                             $Compare\s*
                                             (?:$Ident|-?$Constant)/x &&
                               $value =~ s/\([^\(\)]*\)/1/) {
                        }
#print "value<$value>\n";
                        if ($value =~ /^\s*(?:$Ident|-?$Constant)\s*$/) {
                                ERROR("return is not a function, parentheses are not required\n" . $herecurr);

                        } elsif ($spacing !~ /\s+/) {
                                ERROR("space required before the open parenthesis '('\n" . $herecurr);
                        }
                }
# Return of what appears to be an errno should normally be -'ve
                if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
                        my $name = $1;
                        if ($name ne 'EOF' && $name ne 'ERROR') {

                                WARN("return of an errno should typically be -ve (return -$1)\n" . $herecurr);
                        }
                }

# Need a space before open parenthesis after if, while etc
                if ($line=~/\b(if|while|for|switch)\(/) {
                        ERROR("space required before the open parenthesis '('\n" . $herecurr);
                }

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

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

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

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

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

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

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

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

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

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

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

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

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

#studly caps, commented out until figure out how to distinguish between use of existing and adding new
#               if (($line=~/[\w_][a-z\d]+[A-Z]/) and !($line=~/print/)) {
#                   print "No studly caps, use _\n";
#                   print "$herecurr";
#                   $clean = 0;
#               }

#no spaces allowed after \ in define
                if ($line=~/\#\s*define.*\\\s$/) {
                        WARN("Whitepspace after \\ makes next lines useless\n" . $herecurr);
                }

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

                        my $args = defined($1);

                        # Find the end of the macro and limit our statement
                        # search to that.
                        while ($cnt > 0 && defined $lines[$ln - 1] &&
                                $lines[$ln - 1] =~ /^(?:-|..*\\$)/)
                        {
                                $ctx .= $rawlines[$ln - 1] . "\n";
                                $cnt-- if ($lines[$ln - 1] !~ /^-/);
                                $ln++;
                        }
                        $ctx .= $rawlines[$ln - 1];

                        ($dstat, $dcond, $ln, $cnt, $off) =
                                ctx_statement_block($linenr, $ln - $linenr + 1, 0);
                        #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
                        #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";

                        # Extract the remainder of the define (if any) and
                        # rip off surrounding spaces, and trailing \'s.
                        $rest = '';
                        while ($off != 0 || ($cnt > 0 && $rest =~ /\\\s*$/)) {
                                #print "ADDING cnt<$cnt> $off <" . substr($lines[$ln - 1], $off) . "> rest<$rest>\n";
                                if ($off != 0 || $lines[$ln - 1] !~ /^-/) {
                                        $rest .= substr($lines[$ln - 1], $off) . "\n";
                                        $cnt--;
                                }
                                $ln++;
                                $off = 0;
                        }
                        $rest =~ s/\\\n.//g;
                        $rest =~ s/^\s*//s;
                        $rest =~ s/\s*$//s;

                        # Clean up the original statement.
                        if ($args) {
                                substr($dstat, 0, length($dcond), '');
                        } else {
                                $dstat =~ s/^.\s*\#\s*define\s+$Ident\s*//;
                        }
                        $dstat =~ s/$;//g;
                        $dstat =~ s/\\\n.//g;
                        $dstat =~ s/^\s*//s;
                        $dstat =~ s/\s*$//s;

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

                        my $exceptions = qr{
                                $Declare|
                                module_param_named|
                                MODULE_PARAM_DESC|
                                DECLARE_PER_CPU|
                                DEFINE_PER_CPU|
                                __typeof__\(|
                                union|
                                struct|
                                \.$Ident\s*=\s*|
                                ^\"|\"$
                        }x;
                        #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
                        if ($rest ne '' && $rest ne ',') {
                                if ($rest !~ /while\s*\(/ &&
                                    $dstat !~ /$exceptions/)
                                {
                                        ERROR("Macros with multiple statements should be enclosed in a do - while loop\n" . "$here\n$ctx\n");
                                }

                        } elsif ($ctx !~ /;/) {
                                if ($dstat ne '' &&
                                    $dstat !~ /^(?:$Ident|-?$Constant)$/ &&
                                    $dstat !~ /$exceptions/ &&
                                    $dstat !~ /^\.$Ident\s*=/ &&
                                    $dstat =~ /$Operators/)
                                {
                                        ERROR("Macros with complex values should be enclosed in parenthesis\n" . "$here\n$ctx\n");
                                }
                        }
                }

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

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

                                        #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";

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

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

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

                                        my $spaced_block = $block;
                                        $spaced_block =~ s/\n\+/ /g;

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

                                        print "APW: cond<$cond> block<$block> allowed<$allowed>\n"
                                            if $dbg_adv_apw;
                                        if (statement_lines($cond) > 1) {
                                            print "APW: ALLOWED: cond<$cond>\n"
                                                if $dbg_adv_apw;
                                            $allowed = 1;
                                        }
                                        if ($block =~/\b(?:if|for|while)\b/) {
                                            print "APW: ALLOWED: block<$block>\n"
                                                if $dbg_adv_apw;
                                            $allowed = 1;
                                        }
                                        if (statement_block_size($block) > 1) {
                                            print "APW: ALLOWED: lines block<$block>\n"
                                                if $dbg_adv_apw;
                                            $allowed = 1;
                                        }
                                }
                                if ($seen != ($#chunks + 1)) {
                                        WARN("braces {} are necessary for all arms of this statement\n" . $herectx);
                                }
                        }
                }
                if (!defined $suppress_ifbraces{$linenr - 1} &&
                                        $line =~ /\b(if|while|for|else)\b/ &&
                                        $line !~ /\#\s*if/ &&
                                        $line !~ /\#\s*else/) {
                        my $allowed = 0;

                        # Check the pre-context.
                        if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
                            my $pre = $1;

                            if ($line !~ /else/) {
                                print "APW: ALLOWED: pre<$pre> line<$line>\n"
                                    if $dbg_adv_apw;
                                $allowed = 1;
                            }
                        }

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

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

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

                                WARN("braces {} are necessary even for single statement blocks\n" . $herectx);
                        }
                }

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

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

# check for needless g_free() checks
                if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
                        my $expr = $1;
                        if ($line =~ /\bg_free\(\Q$expr\E\);/) {
                                WARN("g_free(NULL) is safe this check is probably not required\n" . $hereprev);
                        }
                }

# warn about #ifdefs in C files
#               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
#                       print "#ifdef in C files should be avoided\n";
#                       print "$herecurr";
#                       $clean = 0;
#               }

# warn about spacing in #ifdefs
                if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
                        ERROR("exactly one space required after that #$1\n" . $herecurr);
                }
# check for memory barriers without a comment.
                if ($line =~ /\b(smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
                        if (!ctx_has_comment($first_line, $linenr)) {
                                WARN("memory barrier without comment\n" . $herecurr);
                        }
                }
# check of hardware specific defines
# we have e.g. CONFIG_LINUX and CONFIG_WIN32 for common cases
# where they might be necessary.
                if ($line =~ m@^.\s*\#\s*if.*\b__@) {
                        WARN("architecture specific defines should be avoided\n" .  $herecurr);
                }

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

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

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

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

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

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

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

# check for pointless casting of g_malloc return
                if ($line =~ /\*\s*\)\s*g_(try)?(m|re)alloc(0?)(_n)?\b/) {
                        if ($2 == 'm') {
                                WARN("unnecessary cast may hide bugs, use g_$1new$3 instead\n" . $herecurr);
                        } else {
                                WARN("unnecessary cast may hide bugs, use g_$1renew$3 instead\n" . $herecurr);
                        }
                }

# check for gcc specific __FUNCTION__
                if ($line =~ /__FUNCTION__/) {
                        WARN("__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr);
                }

# recommend qemu_strto* over strto* for numeric conversions
                if ($line =~ /\b(strto[^k].*?)\s*\(/) {
                        WARN("consider using qemu_$1 in preference to $1\n" . $herecurr);
                }
# check for module_init(), use category-specific init macros explicitly please
                if ($line =~ /^module_init\s*\(/) {
                        WARN("please use block_init(), type_init() etc. instead of module_init()\n" . $herecurr);
                }
# check for various ops structs, ensure they are const.
                my $struct_ops = qr{AIOCBInfo|
                                BdrvActionOps|
                                BlockDevOps|
                                BlockJobDriver|
                                DisplayChangeListenerOps|
                                GraphicHwOps|
                                IDEDMAOps|
                                KVMCapabilityInfo|
                                MemoryRegionIOMMUOps|
                                MemoryRegionOps|
                                MemoryRegionPortio|
                                QEMUFileOps|
                                SCSIBusInfo|
                                SCSIReqOps|
                                Spice[A-Z][a-zA-Z0-9]*Interface|
                                TPMDriverOps|
                                USBDesc[A-Z][a-zA-Z0-9]*|
                                VhostOps|
                                VMStateDescription|
                                VMStateInfo}x;
                if ($line !~ /\bconst\b/ &&
                    $line =~ /\b($struct_ops)\b/) {
                        WARN("struct $1 should normally be const\n" .
                                $herecurr);
                }

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

# QEMU specific tests
                if ($rawline =~ /\b(?:Qemu|QEmu)\b/) {
                        WARN("use QEMU instead of Qemu or QEmu\n" . $herecurr);
                }

# Qemu error function tests

        # Find newlines in error messages
        my $qemu_error_funcs = qr{error_setg|
                                error_setg_errno|
                                error_setg_win32|
                                error_set|
                                error_vreport|
                                error_report}x;

        if ($rawline =~ /\b(?:$qemu_error_funcs)\s*\(\s*\".*\\n/) {
                WARN("Error messages should not contain newlines\n" . $herecurr);
        }

        # Continue checking for error messages that contains newlines. This
        # check handles cases where string literals are spread over multiple lines.
        # Example:
        # error_report("Error msg line #1"
        #              "Error msg line #2\n");
        my $quoted_newline_regex = qr{\+\s*\".*\\n.*\"};
        my $continued_str_literal = qr{\+\s*\".*\"};

        if ($rawline =~ /$quoted_newline_regex/) {
                # Backtrack to first line that does not contain only a quoted literal
                # and assume that it is the start of the statement.
                my $i = $linenr - 2;

                while (($i >= 0) & $rawlines[$i] =~ /$continued_str_literal/) {
                        $i--;
                }

                if ($rawlines[$i] =~ /\b(?:$qemu_error_funcs)\s*\(/) {
                        WARN("Error messages should not contain newlines\n" . $herecurr);
                }
        }

# check for non-portable ffs() calls that have portable alternatives in QEMU
                if ($line =~ /\bffs\(/) {
                        ERROR("use ctz32() instead of ffs()\n" . $herecurr);
                }
                if ($line =~ /\bffsl\(/) {
                        ERROR("use ctz32() or ctz64() instead of ffsl()\n" . $herecurr);
                }
                if ($line =~ /\bffsll\(/) {
                        ERROR("use ctz64() instead of ffsll()\n" . $herecurr);
                }
        }

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

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

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

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

        print report_dump();
        if ($summary && !($clean == 1 && $quiet == 1)) {
                print "$filename " if ($summary_file);
                print "total: $cnt_error errors, $cnt_warn warnings, " .
                        (($check)? "$cnt_chk checks, " : "") .
                        "$cnt_lines lines checked\n";
                print "\n" if ($quiet == 0);
        }

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

        if ($clean == 1 && $quiet == 0) {
                print "$vname has no obvious style problems and is ready for submission.\n"
        }
        if ($clean == 0 && $quiet == 0) {
                print "$vname has style problems, please review.  If any of these errors\n";
                print "are false positives report them to the maintainer, see\n";
                print "CHECKPATCH in MAINTAINERS.\n";
        }

        return $clean;
}