xref: /freebsd/tools/build/checkstyle9.pl (revision 2008043f386721d58158e37e0d7e50df8095942d) 
1#!/usr/bin/env perl
2# (c) 2001, Dave Jones. (the file handling bit)
3# (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
4# (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
5# (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
6# Licensed under the terms of the GNU GPL License version 2
7
8use strict;
9use warnings;
10use Term::ANSIColor qw(:constants);
11
12my $P = $0;
13$P =~ s@.*/@@g;
14
15our $SrcFile    = qr{\.(?:h|c|cpp|s|S|pl|py|sh)$};
16
17my $V = '0.31';
18
19use Getopt::Long qw(:config no_auto_abbrev);
20
21my $quiet = 0;
22my $tree = 1;
23my $chk_signoff = 1;
24my $chk_patch = undef;
25my $chk_branch = undef;
26my $tst_only;
27my $emacs = 0;
28my $terse = 0;
29my $file = undef;
30my $color = "auto";
31my $no_warnings = 0;
32my $summary = 1;
33my $mailback = 0;
34my $summary_file = 0;
35my $root;
36my %debug;
37my $help = 0;
38
39sub help {
40	my ($exitcode) = @_;
41
42	print << "EOM";
43Usage:
44
45    $P [OPTION]... [FILE]...
46    $P [OPTION]... [GIT-REV-LIST]
47
48Version: $V
49
50Options:
51  -q, --quiet                quiet
52  --patch                    treat FILE as patchfile
53  --branch                   treat args as GIT revision list
54  --emacs                    emacs compile window format
55  --terse                    one line per report
56  -f, --file                 treat FILE as regular source file
57  --strict                   fail if only warnings are found
58  --no-summary               suppress the per-file summary
59  --mailback                 only produce a report in case of warnings/errors
60  --summary-file             include the filename in summary
61  --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
62                             'values', 'possible', 'type', and 'attr' (default
63                             is all off)
64  --test-only=WORD           report only warnings/errors containing WORD
65                             literally
66  --color[=WHEN]             Use colors 'always', 'never', or only when output
67                             is a terminal ('auto'). Default is 'auto'.
68  -h, --help, --version      display this help and exit
69
70When FILE is - read standard input.
71EOM
72
73	exit($exitcode);
74}
75
76# Use at your own risk
77print "\n", MAGENTA, "WARNING:", RESET, " This code is highly experimental ... likely isn't a great style(9) match yet\n\n";
78
79# Perl's Getopt::Long allows options to take optional arguments after a space.
80# Prevent --color by itself from consuming other arguments
81foreach (@ARGV) {
82	if ($_ eq "--color" || $_ eq "-color") {
83		$_ = "--color=$color";
84	}
85}
86
87GetOptions(
88	'q|quiet+'	=> \$quiet,
89	'tree!'		=> \$tree,
90	'signoff!'	=> \$chk_signoff,
91	'patch!'	=> \$chk_patch,
92	'branch!'	=> \$chk_branch,
93	'emacs!'	=> \$emacs,
94	'terse!'	=> \$terse,
95	'f|file!'	=> \$file,
96	'strict!'	=> \$no_warnings,
97	'root=s'	=> \$root,
98	'summary!'	=> \$summary,
99	'mailback!'	=> \$mailback,
100	'summary-file!'	=> \$summary_file,
101
102	'debug=s'	=> \%debug,
103	'test-only=s'	=> \$tst_only,
104	'color=s'       => \$color,
105	'no-color'      => sub { $color = 'never'; },
106	'h|help'	=> \$help,
107	'version'	=> \$help
108) or help(1);
109
110help(0) if ($help);
111
112my $exit = 0;
113
114if ($#ARGV < 0) {
115	print "$P: no input files\n";
116	exit(1);
117}
118
119if (!defined $chk_branch && !defined $chk_patch && !defined $file) {
120	$chk_branch = $ARGV[0] =~ /.\.\./ ? 1 : 0;
121	$file = $ARGV[0] =~ /$SrcFile/ ? 1 : 0;
122	$chk_patch = $chk_branch || $file ? 0 : 1;
123} elsif (!defined $chk_branch && !defined $chk_patch) {
124	if ($file) {
125		$chk_branch = $chk_patch = 0;
126	} else {
127		$chk_branch = $ARGV[0] =~ /.\.\./ ? 1 : 0;
128		$chk_patch = $chk_branch ? 0 : 1;
129	}
130} elsif (!defined $chk_branch && !defined $file) {
131	if ($chk_patch) {
132		$chk_branch = $file = 0;
133	} else {
134		$chk_branch = $ARGV[0] =~ /.\.\./ ? 1 : 0;
135		$file = $chk_branch ? 0 : 1;
136	}
137} elsif (!defined $chk_patch && !defined $file) {
138	if ($chk_branch) {
139		$chk_patch = $file = 0;
140	} else {
141		$file = $ARGV[0] =~ /$SrcFile/ ? 1 : 0;
142		$chk_patch = $file ? 0 : 1;
143	}
144} elsif (!defined $chk_branch) {
145	$chk_branch = $chk_patch || $file ? 0 : 1;
146} elsif (!defined $chk_patch) {
147	$chk_patch = $chk_branch || $file ? 0 : 1;
148} elsif (!defined $file) {
149	$file = $chk_patch || $chk_branch ? 0 : 1;
150}
151
152if (($chk_patch && $chk_branch) ||
153    ($chk_patch && $file) ||
154    ($chk_branch && $file)) {
155	die "Only one of --file, --branch, --patch is permitted\n";
156}
157if (!$chk_patch && !$chk_branch && !$file) {
158	die "One of --file, --branch, --patch is required\n";
159}
160
161if ($color =~ /^always$/i) {
162	$color = 1;
163} elsif ($color =~ /^never$/i) {
164	$color = 0;
165} elsif ($color =~ /^auto$/i) {
166	$color = (-t STDOUT);
167} else {
168	die "Invalid color mode: $color\n";
169}
170
171my $dbg_values = 0;
172my $dbg_possible = 0;
173my $dbg_type = 0;
174my $dbg_attr = 0;
175my $dbg_adv_dcs = 0;
176my $dbg_adv_checking = 0;
177my $dbg_adv_apw = 0;
178for my $key (keys %debug) {
179	## no critic
180	eval "\${dbg_$key} = '$debug{$key}';";
181	die "$@" if ($@);
182}
183
184my $rpt_cleaners = 0;
185
186if ($terse) {
187	$emacs = 1;
188	$quiet++;
189}
190
191my $emitted_corrupt = 0;
192
193our $Ident	= qr{
194			[A-Za-z_][A-Za-z\d_]*
195			(?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
196		}x;
197our $Storage	= qr{extern|static|asmlinkage};
198our $Sparse	= qr{
199			__force
200		}x;
201
202# Notes to $Attribute:
203our $Attribute	= qr{
204			const|
205			volatile|
206			QEMU_NORETURN|
207			QEMU_WARN_UNUSED_RESULT|
208			QEMU_SENTINEL|
209			QEMU_PACKED|
210			GCC_FMT_ATTR
211		  }x;
212our $Modifier;
213our $Inline	= qr{inline};
214our $Member	= qr{->$Ident|\.$Ident|\[[^]]*\]};
215our $Lval	= qr{$Ident(?:$Member)*};
216
217our $Constant	= qr{(?:[0-9]+|0x[0-9a-fA-F]+)[UL]*};
218our $Assignment	= qr{(?:\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=)};
219our $Compare    = qr{<=|>=|==|!=|<|>};
220our $Operators	= qr{
221			<=|>=|==|!=|
222			=>|->|<<|>>|<|>|!|~|
223			&&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%
224		  }x;
225
226our $NonptrType;
227our $Type;
228our $Declare;
229
230our $NON_ASCII_UTF8	= qr{
231	[\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
232	|  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
233	| [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
234	|  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
235	|  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
236	| [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
237	|  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
238}x;
239
240our $UTF8	= qr{
241	[\x09\x0A\x0D\x20-\x7E]              # ASCII
242	| $NON_ASCII_UTF8
243}x;
244
245# some readers default to ISO-8859-1 when showing email source. detect
246# when UTF-8 is incorrectly interpreted as ISO-8859-1 and reencoded back.
247# False positives are possible but very unlikely.
248our $UTF8_MOJIBAKE = qr{
249	\xC3[\x82-\x9F] \xC2[\x80-\xBF]                    # c2-df 80-bf
250	| \xC3\xA0 \xC2[\xA0-\xBF] \xC2[\x80-\xBF]         # e0 a0-bf 80-bf
251	| \xC3[\xA1-\xAC\xAE\xAF] (?: \xC2[\x80-\xBF]){2}  # e1-ec/ee/ef 80-bf 80-bf
252	| \xC3\xAD \xC2[\x80-\x9F] \xC2[\x80-\xBF]         # ed 80-9f 80-bf
253	| \xC3\xB0 \xC2[\x90-\xBF] (?: \xC2[\x80-\xBF]){2} # f0 90-bf 80-bf 80-bf
254	| \xC3[\xB1-\xB3] (?: \xC2[\x80-\xBF]){3}          # f1-f3 80-bf 80-bf 80-bf
255	| \xC3\xB4 \xC2[\x80-\x8F] (?: \xC2[\x80-\xBF]){2} # f4 80-b8 80-bf 80-bf
256}x;
257
258# There are still some false positives, but this catches most
259# common cases.
260our $typeTypedefs = qr{(?x:
261        (?![KMGTPE]iB)                      # IEC binary prefix (do not match)
262        [A-Z][A-Z\d_]*[a-z][A-Za-z\d_]*     # camelcase
263        | [A-Z][A-Z\d_]*AIOCB               # all uppercase
264        | [A-Z][A-Z\d_]*CPU                 # all uppercase
265        | QEMUBH                            # all uppercase
266)};
267
268our @typeList = (
269	qr{void},
270	qr{(?:unsigned\s+)?char},
271	qr{(?:unsigned\s+)?short},
272	qr{(?:unsigned\s+)?int},
273	qr{(?:unsigned\s+)?long},
274	qr{(?:unsigned\s+)?long\s+int},
275	qr{(?:unsigned\s+)?long\s+long},
276	qr{(?:unsigned\s+)?long\s+long\s+int},
277	qr{unsigned},
278	qr{float},
279	qr{double},
280	qr{bool},
281	qr{struct\s+$Ident},
282	qr{union\s+$Ident},
283	qr{enum\s+$Ident},
284	qr{${Ident}_t},
285	qr{${Ident}_handler},
286	qr{${Ident}_handler_fn},
287	qr{target_(?:u)?long},
288	qr{hwaddr},
289);
290
291# This can be modified by sub possible.  Since it can be empty, be careful
292# about regexes that always match, because they can cause infinite loops.
293our @modifierList = (
294);
295
296sub build_types {
297	my $all = "(?x:  \n" . join("|\n  ", @typeList) . "\n)";
298	if (@modifierList > 0) {
299		my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
300		$Modifier = qr{(?:$Attribute|$Sparse|$mods)};
301	} else {
302		$Modifier = qr{(?:$Attribute|$Sparse)};
303	}
304	$NonptrType	= qr{
305			(?:$Modifier\s+|const\s+)*
306			(?:
307				(?:typeof|__typeof__)\s*\(\s*\**\s*$Ident\s*\)|
308				(?:$typeTypedefs\b)|
309				(?:${all}\b)
310			)
311			(?:\s+$Modifier|\s+const)*
312		  }x;
313	$Type	= qr{
314			$NonptrType
315			(?:[\s\*]+\s*const|[\s\*]+|(?:\s*\[\s*\])+)?
316			(?:\s+$Inline|\s+$Modifier)*
317		  }x;
318	$Declare	= qr{(?:$Storage\s+)?$Type};
319}
320build_types();
321
322$chk_signoff = 0 if ($file);
323
324my @rawlines = ();
325my @lines = ();
326my $vname;
327if ($chk_branch) {
328	my @patches;
329	my %git_commits = ();
330	my $HASH;
331	open($HASH, "-|", "git", "log", "--reverse", "--no-merges", "--format=%H %s", $ARGV[0]) ||
332		die "$P: git log --reverse --no-merges --format='%H %s' $ARGV[0] failed - $!\n";
333
334	for my $line (<$HASH>) {
335		$line =~ /^([0-9a-fA-F]{40,40}) (.*)$/;
336		next if (!defined($1) || !defined($2));
337		my $sha1 = $1;
338		my $subject = $2;
339		push(@patches, $sha1);
340		$git_commits{$sha1} = $subject;
341	}
342
343	close $HASH;
344
345	die "$P: no revisions returned for revlist '$ARGV[0]'\n"
346	    unless @patches;
347
348	my $i = 1;
349	my $num_patches = @patches;
350	for my $hash (@patches) {
351		my $FILE;
352		open($FILE, '-|', "git", "show", "--patch-with-stat", $hash) ||
353			die "$P: git show $hash - $!\n";
354		while (<$FILE>) {
355			chomp;
356			push(@rawlines, $_);
357		}
358		close($FILE);
359		$vname = substr($hash, 0, 12) . ' (' . $git_commits{$hash} . ')';
360		if ($num_patches > 1 && $quiet == 0) {
361			my $prefix = "$i/$num_patches";
362			$prefix = BLUE . BOLD . $prefix . RESET if $color;
363			print "$prefix Checking commit $vname\n";
364			$vname = "Patch $i/$num_patches";
365		} else {
366			$vname = "Commit " . $vname;
367		}
368		if (!process($hash)) {
369			$exit = 1;
370			print "\n" if ($num_patches > 1 && $quiet == 0);
371		}
372		@rawlines = ();
373		@lines = ();
374		$i++;
375	}
376} else {
377	for my $filename (@ARGV) {
378		my $FILE;
379		if ($file) {
380			open($FILE, '-|', "diff -u /dev/null $filename") ||
381				die "$P: $filename: diff failed - $!\n";
382		} elsif ($filename eq '-') {
383			open($FILE, '<&STDIN');
384		} else {
385			open($FILE, '<', "$filename") ||
386				die "$P: $filename: open failed - $!\n";
387		}
388		if ($filename eq '-') {
389			$vname = 'Your patch';
390		} else {
391			$vname = $filename;
392		}
393		print "Checking $filename...\n" if @ARGV > 1 && $quiet == 0;
394		while (<$FILE>) {
395			chomp;
396			push(@rawlines, $_);
397		}
398		close($FILE);
399		if (!process($filename)) {
400			$exit = 1;
401		}
402		@rawlines = ();
403		@lines = ();
404	}
405}
406
407exit($exit);
408
409sub top_of_kernel_tree {
410	my ($root) = @_;
411
412	my @tree_check = (
413	    "Makefile.inc1", "README.md", "sys",
414	    "usr.sbin"
415	);
416
417	foreach my $check (@tree_check) {
418		if (! -e $root . '/' . $check) {
419			return 0;
420		}
421	}
422	return 1;
423}
424
425sub expand_tabs {
426	my ($str) = @_;
427
428	my $res = '';
429	my $n = 0;
430	for my $c (split(//, $str)) {
431		if ($c eq "\t") {
432			$res .= ' ';
433			$n++;
434			for (; ($n % 8) != 0; $n++) {
435				$res .= ' ';
436			}
437			next;
438		}
439		$res .= $c;
440		$n++;
441	}
442
443	return $res;
444}
445sub copy_spacing {
446	(my $res = shift) =~ tr/\t/ /c;
447	return $res;
448}
449
450sub line_stats {
451	my ($line) = @_;
452
453	# Drop the diff line leader and expand tabs
454	$line =~ s/^.//;
455	$line = expand_tabs($line);
456
457	# Pick the indent from the front of the line.
458	my ($white) = ($line =~ /^(\s*)/);
459
460	return (length($line), length($white));
461}
462
463my $sanitise_quote = '';
464
465sub sanitise_line_reset {
466	my ($in_comment) = @_;
467
468	if ($in_comment) {
469		$sanitise_quote = '*/';
470	} else {
471		$sanitise_quote = '';
472	}
473}
474sub sanitise_line {
475	my ($line) = @_;
476
477	my $res = '';
478	my $l = '';
479
480	my $qlen = 0;
481	my $off = 0;
482	my $c;
483
484	# Always copy over the diff marker.
485	$res = substr($line, 0, 1);
486
487	for ($off = 1; $off < length($line); $off++) {
488		$c = substr($line, $off, 1);
489
490		# Comments we are wacking completely including the begin
491		# and end, all to $;.
492		if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
493			$sanitise_quote = '*/';
494
495			substr($res, $off, 2, "$;$;");
496			$off++;
497			next;
498		}
499		if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
500			$sanitise_quote = '';
501			substr($res, $off, 2, "$;$;");
502			$off++;
503			next;
504		}
505		if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
506			$sanitise_quote = '//';
507
508			substr($res, $off, 2, $sanitise_quote);
509			$off++;
510			next;
511		}
512
513		# A \ in a string means ignore the next character.
514		if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
515		    $c eq "\\") {
516			substr($res, $off, 2, 'XX');
517			$off++;
518			next;
519		}
520		# Regular quotes.
521		if ($c eq "'" || $c eq '"') {
522			if ($sanitise_quote eq '') {
523				$sanitise_quote = $c;
524
525				substr($res, $off, 1, $c);
526				next;
527			} elsif ($sanitise_quote eq $c) {
528				$sanitise_quote = '';
529			}
530		}
531
532		#print "c<$c> SQ<$sanitise_quote>\n";
533		if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
534			substr($res, $off, 1, $;);
535		} elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
536			substr($res, $off, 1, $;);
537		} elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
538			substr($res, $off, 1, 'X');
539		} else {
540			substr($res, $off, 1, $c);
541		}
542	}
543
544	if ($sanitise_quote eq '//') {
545		$sanitise_quote = '';
546	}
547
548	# The pathname on a #include may be surrounded by '<' and '>'.
549	if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
550		my $clean = 'X' x length($1);
551		$res =~ s@\<.*\>@<$clean>@;
552
553	# The whole of a #error is a string.
554	} elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
555		my $clean = 'X' x length($1);
556		$res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
557	}
558
559	return $res;
560}
561
562sub ctx_statement_block {
563	my ($linenr, $remain, $off) = @_;
564	my $line = $linenr - 1;
565	my $blk = '';
566	my $soff = $off;
567	my $coff = $off - 1;
568	my $coff_set = 0;
569
570	my $loff = 0;
571
572	my $type = '';
573	my $level = 0;
574	my @stack = ();
575	my $p;
576	my $c;
577	my $len = 0;
578
579	my $remainder;
580	while (1) {
581		@stack = (['', 0]) if ($#stack == -1);
582
583		#warn "CSB: blk<$blk> remain<$remain>\n";
584		# If we are about to drop off the end, pull in more
585		# context.
586		if ($off >= $len) {
587			for (; $remain > 0; $line++) {
588				last if (!defined $lines[$line]);
589				next if ($lines[$line] =~ /^-/);
590				$remain--;
591				$loff = $len;
592				$blk .= $lines[$line] . "\n";
593				$len = length($blk);
594				$line++;
595				last;
596			}
597			# Bail if there is no further context.
598			#warn "CSB: blk<$blk> off<$off> len<$len>\n";
599			if ($off >= $len) {
600				last;
601			}
602		}
603		$p = $c;
604		$c = substr($blk, $off, 1);
605		$remainder = substr($blk, $off);
606
607		#warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
608
609		# Handle nested #if/#else.
610		if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
611			push(@stack, [ $type, $level ]);
612		} elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
613			($type, $level) = @{$stack[$#stack - 1]};
614		} elsif ($remainder =~ /^#\s*endif\b/) {
615			($type, $level) = @{pop(@stack)};
616		}
617
618		# Statement ends at the ';' or a close '}' at the
619		# outermost level.
620		if ($level == 0 && $c eq ';') {
621			last;
622		}
623
624		# An else is really a conditional as long as its not else if
625		if ($level == 0 && $coff_set == 0 &&
626				(!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
627				$remainder =~ /^(else)(?:\s|{)/ &&
628				$remainder !~ /^else\s+if\b/) {
629			$coff = $off + length($1) - 1;
630			$coff_set = 1;
631			#warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
632			#warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
633		}
634
635		if (($type eq '' || $type eq '(') && $c eq '(') {
636			$level++;
637			$type = '(';
638		}
639		if ($type eq '(' && $c eq ')') {
640			$level--;
641			$type = ($level != 0)? '(' : '';
642
643			if ($level == 0 && $coff < $soff) {
644				$coff = $off;
645				$coff_set = 1;
646				#warn "CSB: mark coff<$coff>\n";
647			}
648		}
649		if (($type eq '' || $type eq '{') && $c eq '{') {
650			$level++;
651			$type = '{';
652		}
653		if ($type eq '{' && $c eq '}') {
654			$level--;
655			$type = ($level != 0)? '{' : '';
656
657			if ($level == 0) {
658				if (substr($blk, $off + 1, 1) eq ';') {
659					$off++;
660				}
661				last;
662			}
663		}
664		$off++;
665	}
666	# We are truly at the end, so shuffle to the next line.
667	if ($off == $len) {
668		$loff = $len + 1;
669		$line++;
670		$remain--;
671	}
672
673	my $statement = substr($blk, $soff, $off - $soff + 1);
674	my $condition = substr($blk, $soff, $coff - $soff + 1);
675
676	#warn "STATEMENT<$statement>\n";
677	#warn "CONDITION<$condition>\n";
678
679	#print "coff<$coff> soff<$off> loff<$loff>\n";
680
681	return ($statement, $condition,
682			$line, $remain + 1, $off - $loff + 1, $level);
683}
684
685sub statement_lines {
686	my ($stmt) = @_;
687
688	# Strip the diff line prefixes and rip blank lines at start and end.
689	$stmt =~ s/(^|\n)./$1/g;
690	$stmt =~ s/^\s*//;
691	$stmt =~ s/\s*$//;
692
693	my @stmt_lines = ($stmt =~ /\n/g);
694
695	return $#stmt_lines + 2;
696}
697
698sub statement_rawlines {
699	my ($stmt) = @_;
700
701	my @stmt_lines = ($stmt =~ /\n/g);
702
703	return $#stmt_lines + 2;
704}
705
706sub statement_block_size {
707	my ($stmt) = @_;
708
709	$stmt =~ s/(^|\n)./$1/g;
710	$stmt =~ s/^\s*\{//;
711	$stmt =~ s/}\s*$//;
712	$stmt =~ s/^\s*//;
713	$stmt =~ s/\s*$//;
714
715	my @stmt_lines = ($stmt =~ /\n/g);
716	my @stmt_statements = ($stmt =~ /;/g);
717
718	my $stmt_lines = $#stmt_lines + 2;
719	my $stmt_statements = $#stmt_statements + 1;
720
721	if ($stmt_lines > $stmt_statements) {
722		return $stmt_lines;
723	} else {
724		return $stmt_statements;
725	}
726}
727
728sub ctx_statement_full {
729	my ($linenr, $remain, $off) = @_;
730	my ($statement, $condition, $level);
731
732	my (@chunks);
733
734	# Grab the first conditional/block pair.
735	($statement, $condition, $linenr, $remain, $off, $level) =
736				ctx_statement_block($linenr, $remain, $off);
737	#print "F: c<$condition> s<$statement> remain<$remain>\n";
738	push(@chunks, [ $condition, $statement ]);
739	if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
740		return ($level, $linenr, @chunks);
741	}
742
743	# Pull in the following conditional/block pairs and see if they
744	# could continue the statement.
745	for (;;) {
746		($statement, $condition, $linenr, $remain, $off, $level) =
747				ctx_statement_block($linenr, $remain, $off);
748		#print "C: c<$condition> s<$statement> remain<$remain>\n";
749		last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
750		#print "C: push\n";
751		push(@chunks, [ $condition, $statement ]);
752	}
753
754	return ($level, $linenr, @chunks);
755}
756
757sub ctx_block_get {
758	my ($linenr, $remain, $outer, $open, $close, $off) = @_;
759	my $line;
760	my $start = $linenr - 1;
761	my $blk = '';
762	my @o;
763	my @c;
764	my @res = ();
765
766	my $level = 0;
767	my @stack = ($level);
768	for ($line = $start; $remain > 0; $line++) {
769		next if ($rawlines[$line] =~ /^-/);
770		$remain--;
771
772		$blk .= $rawlines[$line];
773
774		# Handle nested #if/#else.
775		if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
776			push(@stack, $level);
777		} elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
778			$level = $stack[$#stack - 1];
779		} elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
780			$level = pop(@stack);
781		}
782
783		foreach my $c (split(//, $lines[$line])) {
784			##print "C<$c>L<$level><$open$close>O<$off>\n";
785			if ($off > 0) {
786				$off--;
787				next;
788			}
789
790			if ($c eq $close && $level > 0) {
791				$level--;
792				last if ($level == 0);
793			} elsif ($c eq $open) {
794				$level++;
795			}
796		}
797
798		if (!$outer || $level <= 1) {
799			push(@res, $rawlines[$line]);
800		}
801
802		last if ($level == 0);
803	}
804
805	return ($level, @res);
806}
807sub ctx_block_outer {
808	my ($linenr, $remain) = @_;
809
810	my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
811	return @r;
812}
813sub ctx_block {
814	my ($linenr, $remain) = @_;
815
816	my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
817	return @r;
818}
819sub ctx_statement {
820	my ($linenr, $remain, $off) = @_;
821
822	my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
823	return @r;
824}
825sub ctx_block_level {
826	my ($linenr, $remain) = @_;
827
828	return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
829}
830sub ctx_statement_level {
831	my ($linenr, $remain, $off) = @_;
832
833	return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
834}
835
836sub ctx_locate_comment {
837	my ($first_line, $end_line) = @_;
838
839	# Catch a comment on the end of the line itself.
840	my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
841	return $current_comment if (defined $current_comment);
842
843	# Look through the context and try and figure out if there is a
844	# comment.
845	my $in_comment = 0;
846	$current_comment = '';
847	for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
848		my $line = $rawlines[$linenr - 1];
849		#warn "           $line\n";
850		if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
851			$in_comment = 1;
852		}
853		if ($line =~ m@/\*@) {
854			$in_comment = 1;
855		}
856		if (!$in_comment && $current_comment ne '') {
857			$current_comment = '';
858		}
859		$current_comment .= $line . "\n" if ($in_comment);
860		if ($line =~ m@\*/@) {
861			$in_comment = 0;
862		}
863	}
864
865	chomp($current_comment);
866	return($current_comment);
867}
868sub ctx_has_comment {
869	my ($first_line, $end_line) = @_;
870	my $cmt = ctx_locate_comment($first_line, $end_line);
871
872	##print "LINE: $rawlines[$end_line - 1 ]\n";
873	##print "CMMT: $cmt\n";
874
875	return ($cmt ne '');
876}
877
878sub raw_line {
879	my ($linenr, $cnt) = @_;
880
881	my $offset = $linenr - 1;
882	$cnt++;
883
884	my $line;
885	while ($cnt) {
886		$line = $rawlines[$offset++];
887		next if (defined($line) && $line =~ /^-/);
888		$cnt--;
889	}
890
891	return $line;
892}
893
894sub cat_vet {
895	my ($vet) = @_;
896	my ($res, $coded);
897
898	$res = '';
899	while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
900		$res .= $1;
901		if ($2 ne '') {
902			$coded = sprintf("^%c", unpack('C', $2) + 64);
903			$res .= $coded;
904		}
905	}
906	$res =~ s/$/\$/;
907
908	return $res;
909}
910
911my $av_preprocessor = 0;
912my $av_pending;
913my @av_paren_type;
914my $av_pend_colon;
915
916sub annotate_reset {
917	$av_preprocessor = 0;
918	$av_pending = '_';
919	@av_paren_type = ('E');
920	$av_pend_colon = 'O';
921}
922
923sub annotate_values {
924	my ($stream, $type) = @_;
925
926	my $res;
927	my $var = '_' x length($stream);
928	my $cur = $stream;
929
930	print "$stream\n" if ($dbg_values > 1);
931
932	while (length($cur)) {
933		@av_paren_type = ('E') if ($#av_paren_type < 0);
934		print " <" . join('', @av_paren_type) .
935				"> <$type> <$av_pending>" if ($dbg_values > 1);
936		if ($cur =~ /^(\s+)/o) {
937			print "WS($1)\n" if ($dbg_values > 1);
938			if ($1 =~ /\n/ && $av_preprocessor) {
939				$type = pop(@av_paren_type);
940				$av_preprocessor = 0;
941			}
942
943		} elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
944			print "CAST($1)\n" if ($dbg_values > 1);
945			push(@av_paren_type, $type);
946			$type = 'C';
947
948		} elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
949			print "DECLARE($1)\n" if ($dbg_values > 1);
950			$type = 'T';
951
952		} elsif ($cur =~ /^($Modifier)\s*/) {
953			print "MODIFIER($1)\n" if ($dbg_values > 1);
954			$type = 'T';
955
956		} elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
957			print "DEFINE($1,$2)\n" if ($dbg_values > 1);
958			$av_preprocessor = 1;
959			push(@av_paren_type, $type);
960			if ($2 ne '') {
961				$av_pending = 'N';
962			}
963			$type = 'E';
964
965		} elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
966			print "UNDEF($1)\n" if ($dbg_values > 1);
967			$av_preprocessor = 1;
968			push(@av_paren_type, $type);
969
970		} elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
971			print "PRE_START($1)\n" if ($dbg_values > 1);
972			$av_preprocessor = 1;
973
974			push(@av_paren_type, $type);
975			push(@av_paren_type, $type);
976			$type = 'E';
977
978		} elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
979			print "PRE_RESTART($1)\n" if ($dbg_values > 1);
980			$av_preprocessor = 1;
981
982			push(@av_paren_type, $av_paren_type[$#av_paren_type]);
983
984			$type = 'E';
985
986		} elsif ($cur =~ /^(\#\s*(?:endif))/o) {
987			print "PRE_END($1)\n" if ($dbg_values > 1);
988
989			$av_preprocessor = 1;
990
991			# Assume all arms of the conditional end as this
992			# one does, and continue as if the #endif was not here.
993			pop(@av_paren_type);
994			push(@av_paren_type, $type);
995			$type = 'E';
996
997		} elsif ($cur =~ /^(\\\n)/o) {
998			print "PRECONT($1)\n" if ($dbg_values > 1);
999
1000		} elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
1001			print "ATTR($1)\n" if ($dbg_values > 1);
1002			$av_pending = $type;
1003			$type = 'N';
1004
1005		} elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
1006			print "SIZEOF($1)\n" if ($dbg_values > 1);
1007			if (defined $2) {
1008				$av_pending = 'V';
1009			}
1010			$type = 'N';
1011
1012		} elsif ($cur =~ /^(if|while|for)\b/o) {
1013			print "COND($1)\n" if ($dbg_values > 1);
1014			$av_pending = 'E';
1015			$type = 'N';
1016
1017		} elsif ($cur =~/^(case)/o) {
1018			print "CASE($1)\n" if ($dbg_values > 1);
1019			$av_pend_colon = 'C';
1020			$type = 'N';
1021
1022		} elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
1023			print "KEYWORD($1)\n" if ($dbg_values > 1);
1024			$type = 'N';
1025
1026		} elsif ($cur =~ /^(\()/o) {
1027			print "PAREN('$1')\n" if ($dbg_values > 1);
1028			push(@av_paren_type, $av_pending);
1029			$av_pending = '_';
1030			$type = 'N';
1031
1032		} elsif ($cur =~ /^(\))/o) {
1033			my $new_type = pop(@av_paren_type);
1034			if ($new_type ne '_') {
1035				$type = $new_type;
1036				print "PAREN('$1') -> $type\n"
1037							if ($dbg_values > 1);
1038			} else {
1039				print "PAREN('$1')\n" if ($dbg_values > 1);
1040			}
1041
1042		} elsif ($cur =~ /^($Ident)\s*\(/o) {
1043			print "FUNC($1)\n" if ($dbg_values > 1);
1044			$type = 'V';
1045			$av_pending = 'V';
1046
1047		} elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
1048			if (defined $2 && $type eq 'C' || $type eq 'T') {
1049				$av_pend_colon = 'B';
1050			} elsif ($type eq 'E') {
1051				$av_pend_colon = 'L';
1052			}
1053			print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
1054			$type = 'V';
1055
1056		} elsif ($cur =~ /^($Ident|$Constant)/o) {
1057			print "IDENT($1)\n" if ($dbg_values > 1);
1058			$type = 'V';
1059
1060		} elsif ($cur =~ /^($Assignment)/o) {
1061			print "ASSIGN($1)\n" if ($dbg_values > 1);
1062			$type = 'N';
1063
1064		} elsif ($cur =~/^(;|{|})/) {
1065			print "END($1)\n" if ($dbg_values > 1);
1066			$type = 'E';
1067			$av_pend_colon = 'O';
1068
1069		} elsif ($cur =~/^(,)/) {
1070			print "COMMA($1)\n" if ($dbg_values > 1);
1071			$type = 'C';
1072
1073		} elsif ($cur =~ /^(\?)/o) {
1074			print "QUESTION($1)\n" if ($dbg_values > 1);
1075			$type = 'N';
1076
1077		} elsif ($cur =~ /^(:)/o) {
1078			print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
1079
1080			substr($var, length($res), 1, $av_pend_colon);
1081			if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
1082				$type = 'E';
1083			} else {
1084				$type = 'N';
1085			}
1086			$av_pend_colon = 'O';
1087
1088		} elsif ($cur =~ /^(\[)/o) {
1089			print "CLOSE($1)\n" if ($dbg_values > 1);
1090			$type = 'N';
1091
1092		} elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1093			my $variant;
1094
1095			print "OPV($1)\n" if ($dbg_values > 1);
1096			if ($type eq 'V') {
1097				$variant = 'B';
1098			} else {
1099				$variant = 'U';
1100			}
1101
1102			substr($var, length($res), 1, $variant);
1103			$type = 'N';
1104
1105		} elsif ($cur =~ /^($Operators)/o) {
1106			print "OP($1)\n" if ($dbg_values > 1);
1107			if ($1 ne '++' && $1 ne '--') {
1108				$type = 'N';
1109			}
1110
1111		} elsif ($cur =~ /(^.)/o) {
1112			print "C($1)\n" if ($dbg_values > 1);
1113		}
1114		if (defined $1) {
1115			$cur = substr($cur, length($1));
1116			$res .= $type x length($1);
1117		}
1118	}
1119
1120	return ($res, $var);
1121}
1122
1123sub possible {
1124	my ($possible, $line) = @_;
1125	my $notPermitted = qr{(?:
1126		^(?:
1127			$Modifier|
1128			$Storage|
1129			$Type|
1130			DEFINE_\S+
1131		)$|
1132		^(?:
1133			goto|
1134			return|
1135			case|
1136			else|
1137			asm|__asm__|
1138			do
1139		)(?:\s|$)|
1140		^(?:typedef|struct|enum)\b|
1141		^\#
1142	    )}x;
1143	warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
1144	if ($possible !~ $notPermitted) {
1145		# Check for modifiers.
1146		$possible =~ s/\s*$Storage\s*//g;
1147		$possible =~ s/\s*$Sparse\s*//g;
1148		if ($possible =~ /^\s*$/) {
1149
1150		} elsif ($possible =~ /\s/) {
1151			$possible =~ s/\s*(?:$Type|\#\#)\s*//g;
1152			for my $modifier (split(' ', $possible)) {
1153				if ($modifier !~ $notPermitted) {
1154					warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
1155					push(@modifierList, $modifier);
1156				}
1157			}
1158
1159		} else {
1160			warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
1161			push(@typeList, $possible);
1162		}
1163		build_types();
1164	} else {
1165		warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
1166	}
1167}
1168
1169my $prefix = '';
1170
1171sub report {
1172	my ($level, $msg) = @_;
1173	if (defined $tst_only && $msg !~ /\Q$tst_only\E/) {
1174		return 0;
1175	}
1176
1177	my $output = '';
1178	$output .= BOLD if $color;
1179	$output .= $prefix;
1180	$output .= RED if $color && $level eq 'ERROR';
1181	$output .= MAGENTA if $color && $level eq 'WARNING';
1182	$output .= $level . ':';
1183	$output .= RESET if $color;
1184	$output .= ' ' . $msg . "\n";
1185
1186	$output = (split('\n', $output))[0] . "\n" if ($terse);
1187
1188	push(our @report, $output);
1189
1190	return 1;
1191}
1192sub report_dump {
1193	our @report;
1194}
1195sub ERROR {
1196 	if (report("ERROR", $_[0])) {
1197		our $clean = 0;
1198		our $cnt_error++;
1199	}
1200}
1201sub WARN {
1202	if (report("WARNING", $_[0])) {
1203		our $clean = 0;
1204		our $cnt_warn++;
1205	}
1206}
1207
1208# According to tests/qtest/bios-tables-test.c: do not
1209# change expected file in the same commit with adding test
1210sub checkfilename {
1211	my ($name, $acpi_testexpected, $acpi_nontestexpected) = @_;
1212
1213        # Note: shell script that rebuilds the expected files is in the same
1214        # directory as files themselves.
1215        # Note: allowed diff list can be changed both when changing expected
1216        # files and when changing tests.
1217	if ($name =~ m#^tests/data/acpi/# and not $name =~ m#^\.sh$#) {
1218		$$acpi_testexpected = $name;
1219	} elsif ($name !~ m#^tests/qtest/bios-tables-test-allowed-diff.h$#) {
1220		$$acpi_nontestexpected = $name;
1221	}
1222	if (defined $$acpi_testexpected and defined $$acpi_nontestexpected) {
1223		ERROR("Do not add expected files together with tests, " .
1224		      "follow instructions in " .
1225		      "tests/qtest/bios-tables-test.c: both " .
1226		      $$acpi_testexpected . " and " .
1227		      $$acpi_nontestexpected . " found\n");
1228	}
1229}
1230
1231sub process {
1232	my $filename = shift;
1233
1234	my $linenr=0;
1235	my $prevline="";
1236	my $prevrawline="";
1237	my $stashline="";
1238	my $stashrawline="";
1239
1240	my $length;
1241	my $indent;
1242	my $previndent=0;
1243	my $stashindent=0;
1244
1245	our $clean = 1;
1246	my $signoff = 0;
1247	my $is_patch = 0;
1248
1249	my $in_header_lines = $file ? 0 : 1;
1250	my $in_commit_log = 0;		#Scanning lines before patch
1251	my $non_utf8_charset = 0;
1252
1253	our @report = ();
1254	our $cnt_lines = 0;
1255	our $cnt_error = 0;
1256	our $cnt_warn = 0;
1257	our $cnt_chk = 0;
1258
1259	# Trace the real file/line as we go.
1260	my $realfile = '';
1261	my $realline = 0;
1262	my $realcnt = 0;
1263	my $here = '';
1264	my $in_comment = 0;
1265	my $comment_edge = 0;
1266	my $first_line = 0;
1267	my $p1_prefix = '';
1268
1269	my $prev_values = 'E';
1270
1271	# suppression flags
1272	my %suppress_ifbraces;
1273	my %suppress_whiletrailers;
1274	my %suppress_export;
1275
1276        my $acpi_testexpected;
1277        my $acpi_nontestexpected;
1278
1279	# Pre-scan the patch sanitizing the lines.
1280
1281	sanitise_line_reset();
1282	my $line;
1283	foreach my $rawline (@rawlines) {
1284		$linenr++;
1285		$line = $rawline;
1286
1287		if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1288			$realline=$1-1;
1289			if (defined $2) {
1290				$realcnt=$3+1;
1291			} else {
1292				$realcnt=1+1;
1293			}
1294			$in_comment = 0;
1295
1296			# Guestimate if this is a continuing comment.  Run
1297			# the context looking for a comment "edge".  If this
1298			# edge is a close comment then we must be in a comment
1299			# at context start.
1300			my $edge;
1301			my $cnt = $realcnt;
1302			for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1303				next if (defined $rawlines[$ln - 1] &&
1304					 $rawlines[$ln - 1] =~ /^-/);
1305				$cnt--;
1306				#print "RAW<$rawlines[$ln - 1]>\n";
1307				last if (!defined $rawlines[$ln - 1]);
1308				if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1309				    $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1310					($edge) = $1;
1311					last;
1312				}
1313			}
1314			if (defined $edge && $edge eq '*/') {
1315				$in_comment = 1;
1316			}
1317
1318			# Guestimate if this is a continuing comment.  If this
1319			# is the start of a diff block and this line starts
1320			# ' *' then it is very likely a comment.
1321			if (!defined $edge &&
1322			    $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1323			{
1324				$in_comment = 1;
1325			}
1326
1327			##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1328			sanitise_line_reset($in_comment);
1329
1330		} elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1331			# Standardise the strings and chars within the input to
1332			# simplify matching -- only bother with positive lines.
1333			$line = sanitise_line($rawline);
1334		}
1335		push(@lines, $line);
1336
1337		if ($realcnt > 1) {
1338			$realcnt-- if ($line =~ /^(?:\+| |$)/);
1339		} else {
1340			$realcnt = 0;
1341		}
1342
1343		#print "==>$rawline\n";
1344		#print "-->$line\n";
1345	}
1346
1347	$prefix = '';
1348
1349	$realcnt = 0;
1350	$linenr = 0;
1351	foreach my $line (@lines) {
1352		$linenr++;
1353
1354		my $rawline = $rawlines[$linenr - 1];
1355
1356#extract the line range in the file after the patch is applied
1357		if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1358			$is_patch = 1;
1359			$first_line = $linenr + 1;
1360			$realline=$1-1;
1361			if (defined $2) {
1362				$realcnt=$3+1;
1363			} else {
1364				$realcnt=1+1;
1365			}
1366			annotate_reset();
1367			$prev_values = 'E';
1368
1369			%suppress_ifbraces = ();
1370			%suppress_whiletrailers = ();
1371			%suppress_export = ();
1372			next;
1373
1374# track the line number as we move through the hunk, note that
1375# new versions of GNU diff omit the leading space on completely
1376# blank context lines so we need to count that too.
1377		} elsif ($line =~ /^( |\+|$)/) {
1378			$realline++;
1379			$realcnt-- if ($realcnt != 0);
1380
1381			# Measure the line length and indent.
1382			($length, $indent) = line_stats($rawline);
1383
1384			# Track the previous line.
1385			($prevline, $stashline) = ($stashline, $line);
1386			($previndent, $stashindent) = ($stashindent, $indent);
1387			($prevrawline, $stashrawline) = ($stashrawline, $rawline);
1388
1389			#warn "line<$line>\n";
1390
1391		} elsif ($realcnt == 1) {
1392			$realcnt--;
1393		}
1394
1395		my $hunk_line = ($realcnt != 0);
1396
1397#make up the handle for any error we report on this line
1398		$prefix = "$filename:$realline: " if ($emacs && $file);
1399		$prefix = "$filename:$linenr: " if ($emacs && !$file);
1400
1401		$here = "#$linenr: " if (!$file);
1402		$here = "#$realline: " if ($file);
1403
1404		# extract the filename as it passes
1405		if ($line =~ /^diff --git.*?(\S+)$/) {
1406			$realfile = $1;
1407			$realfile =~ s@^([^/]*)/@@ if (!$file);
1408	                checkfilename($realfile, \$acpi_testexpected, \$acpi_nontestexpected);
1409		} elsif ($line =~ /^\+\+\+\s+(\S+)/) {
1410			$realfile = $1;
1411			$realfile =~ s@^([^/]*)/@@ if (!$file);
1412	                checkfilename($realfile, \$acpi_testexpected, \$acpi_nontestexpected);
1413
1414			$p1_prefix = $1;
1415			if (!$file && $tree && $p1_prefix ne '' &&
1416			    -e "$root/$p1_prefix") {
1417				WARN("patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
1418			}
1419
1420			next;
1421		}
1422
1423		$here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
1424
1425		my $hereline = "$here\n$rawline\n";
1426		my $herecurr = "$here\n$rawline\n";
1427		my $hereprev = "$here\n$prevrawline\n$rawline\n";
1428
1429		$cnt_lines++ if ($realcnt != 0);
1430
1431# Check for incorrect file permissions
1432		if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
1433			my $permhere = $here . "FILE: $realfile\n";
1434			if ($realfile =~ /(\bMakefile(?:\.objs)?|\.c|\.cc|\.cpp|\.h|\.mak|\.[sS])$/) {
1435				ERROR("do not set execute permissions for source files\n" . $permhere);
1436			}
1437		}
1438
1439# Only allow Python 3 interpreter
1440		if ($realline == 1 &&
1441			$line =~ /^\+#!\ *\/usr\/bin\/(?:env )?python$/) {
1442			ERROR("please use python3 interpreter\n" . $herecurr);
1443		}
1444
1445# Accept git diff extended headers as valid patches
1446		if ($line =~ /^(?:rename|copy) (?:from|to) [\w\/\.\-]+\s*$/) {
1447			$is_patch = 1;
1448		}
1449
1450		if ($line =~ /^(Author|From): .*noreply.*/) {
1451		    ERROR("Real email adress is needed\n" . $herecurr);
1452		}
1453
1454#check the patch for a signoff:
1455		if ($line =~ /^\s*signed-off-by:/i) {
1456			# This is a signoff, if ugly, so do not double report.
1457			$in_commit_log = 0;
1458
1459			if (!($line =~ /^\s*Signed-off-by:/)) {
1460				ERROR("The correct form is \"Signed-off-by\"\n" .
1461					$herecurr);
1462			}
1463			if ($line =~ /^\s*signed-off-by:\S/i) {
1464				ERROR("space required after Signed-off-by:\n" .
1465					$herecurr);
1466			}
1467		}
1468
1469# Check for wrappage within a valid hunk of the file
1470		if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
1471			ERROR("patch seems to be corrupt (line wrapped?)\n" .
1472				$herecurr) if (!$emitted_corrupt++);
1473		}
1474
1475# UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
1476		if (($realfile =~ /^$/ || $line =~ /^\+/) &&
1477		    $rawline !~ m/^$UTF8*$/) {
1478			my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
1479
1480			my $blank = copy_spacing($rawline);
1481			my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
1482			my $hereptr = "$hereline$ptr\n";
1483
1484			ERROR("Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
1485		}
1486
1487		if ($rawline =~ m/$UTF8_MOJIBAKE/) {
1488			ERROR("Doubly-encoded UTF-8\n" . $herecurr);
1489		}
1490# Check if it's the start of a commit log
1491# (not a header line and we haven't seen the patch filename)
1492		if ($in_header_lines && $realfile =~ /^$/ &&
1493		    !($rawline =~ /^\s+\S/ ||
1494		      $rawline =~ /^(commit\b|from\b|[\w-]+:).*$/i)) {
1495			$in_header_lines = 0;
1496			$in_commit_log = 1;
1497		}
1498
1499# Check if there is UTF-8 in a commit log when a mail header has explicitly
1500# declined it, i.e defined some charset where it is missing.
1501		if ($in_header_lines &&
1502		    $rawline =~ /^Content-Type:.+charset="(.+)".*$/ &&
1503		    $1 !~ /utf-8/i) {
1504			$non_utf8_charset = 1;
1505		}
1506
1507		if ($in_commit_log && $non_utf8_charset && $realfile =~ /^$/ &&
1508		    $rawline =~ /$NON_ASCII_UTF8/) {
1509			WARN("8-bit UTF-8 used in possible commit log\n" . $herecurr);
1510		}
1511
1512# ignore non-hunk lines and lines being removed
1513		next if (!$hunk_line || $line =~ /^-/);
1514
1515# ignore files that are being periodically imported from Linux
1516		next if ($realfile =~ /^(linux-headers|include\/standard-headers)\//);
1517
1518#trailing whitespace
1519		if ($line =~ /^\+.*\015/) {
1520			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1521			ERROR("DOS line endings\n" . $herevet);
1522
1523		} elsif ($realfile =~ /^docs\/.+\.txt/ ||
1524			 $realfile =~ /^docs\/.+\.md/) {
1525		    if ($rawline =~ /^\+\s+$/ && $rawline !~ /^\+ {4}$/) {
1526			# TODO: properly check we're in a code block
1527			#       (surrounding text is 4-column aligned)
1528			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1529			ERROR("code blocks in documentation should have " .
1530			      "empty lines with exactly 4 columns of " .
1531			      "whitespace\n" . $herevet);
1532		    }
1533		} elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
1534			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1535			ERROR("trailing whitespace\n" . $herevet);
1536			$rpt_cleaners = 1;
1537		}
1538
1539# checks for trace-events files
1540		if ($realfile =~ /trace-events$/ && $line =~ /^\+/) {
1541			if ($rawline =~ /%[-+ 0]*#/) {
1542				ERROR("Don't use '#' flag of printf format ('%#') in " .
1543				      "trace-events, use '0x' prefix instead\n" . $herecurr);
1544			} else {
1545				my $hex =
1546					qr/%[-+ *.0-9]*([hljztL]|ll|hh)?(x|X|"\s*PRI[xX][^"]*"?)/;
1547
1548				# don't consider groups splitted by [.:/ ], like 2A.20:12ab
1549				my $tmpline = $rawline;
1550				$tmpline =~ s/($hex[.:\/ ])+$hex//g;
1551
1552				if ($tmpline =~ /(?<!0x)$hex/) {
1553					ERROR("Hex numbers must be prefixed with '0x'\n" .
1554					      $herecurr);
1555				}
1556			}
1557		}
1558
1559# check we are in a valid source file if not then ignore this hunk
1560		next if ($realfile !~ /$SrcFile/);
1561
1562#120 column limit; exempt URLs, if no other words on line
1563		if ($line =~ /^\+/ &&
1564		    !($line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
1565		    !($rawline =~ /^[^[:alnum:]]*https?:\S*$/) &&
1566		    $length > 80 &&
1567		    $realfile !~ /\/tests\//)
1568		{
1569			if ($length > 120) {
1570				ERROR("line over 120 characters\n" . $herecurr);
1571			} else {
1572				WARN("line over 80 characters\n" . $herecurr);
1573			}
1574		}
1575
1576# check for spaces before a quoted newline
1577		if ($rawline =~ /^.*\".*\s\\n/) {
1578			ERROR("unnecessary whitespace before a quoted newline\n" . $herecurr);
1579		}
1580
1581# check for adding lines without a newline.
1582		if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
1583			ERROR("adding a line without newline at end of file\n" . $herecurr);
1584		}
1585
1586# check for RCS/CVS revision markers
1587		if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|\b)/) {
1588			ERROR("CVS style keyword markers, these will _not_ be updated\n". $herecurr);
1589		}
1590
1591# check we are in a valid C source file if not then ignore this hunk
1592		next if ($realfile !~ /\.(h|c|cpp)$/);
1593
1594# Block comment styles
1595
1596		# Block comments use /* on a line of its own
1597		if ($rawline !~ m@^\+.*/\*.*\*/[ \t)}]*$@ &&	#inline /*...*/
1598		    $rawline =~ m@^\+.*/\*[*-]?+[ \t]*[^ \t]@) { # /* or /** or /*- non-blank
1599			WARN("Block comments use a leading /* on a separate line\n" . $herecurr);
1600		}
1601
1602# Block comments use * on subsequent lines
1603		if ($prevline =~ /$;[ \t]*$/ &&			#ends in comment
1604		    $prevrawline =~ /^\+.*?\/\*/ &&		#starting /*
1605		    $prevrawline !~ /\*\/[ \t]*$/ &&		#no trailing */
1606		    $rawline =~ /^\+/ &&			#line is new
1607		    $rawline !~ /^\+[ \t]*\*/) {		#no leading *
1608			WARN("Block comments use * on subsequent lines\n" . $hereprev);
1609		}
1610
1611# Block comments use */ on trailing lines
1612		if ($rawline !~ m@^\+[ \t]*\*/[ \t]*$@ &&	#trailing */
1613		    $rawline !~ m@^\+.*/\*.*\*/[ \t]*$@ &&	#inline /*...*/
1614		    $rawline !~ m@^\+.*\*{2,}/[ \t]*$@ &&	#trailing **/
1615		    $rawline =~ m@^\+[ \t]*.+\*\/[ \t]*$@) {	#non blank */
1616			WARN("Block comments use a trailing */ on a separate line\n" . $herecurr);
1617		}
1618
1619# Block comment * alignment
1620		if ($prevline =~ /$;[ \t]*$/ &&			#ends in comment
1621		    $line =~ /^\+[ \t]*$;/ &&			#leading comment
1622		    $rawline =~ /^\+[ \t]*\*/ &&		#leading *
1623		    (($prevrawline =~ /^\+.*?\/\*/ &&		#leading /*
1624		      $prevrawline !~ /\*\/[ \t]*$/) ||		#no trailing */
1625		     $prevrawline =~ /^\+[ \t]*\*/)) {		#leading *
1626			my $oldindent;
1627			$prevrawline =~ m@^\+([ \t]*/?)\*@;
1628			if (defined($1)) {
1629				$oldindent = expand_tabs($1);
1630			} else {
1631				$prevrawline =~ m@^\+(.*/?)\*@;
1632				$oldindent = expand_tabs($1);
1633			}
1634			$rawline =~ m@^\+([ \t]*)\*@;
1635			my $newindent = $1;
1636			$newindent = expand_tabs($newindent);
1637			if (length($oldindent) ne length($newindent)) {
1638				WARN("Block comments should align the * on each line\n" . $hereprev);
1639			}
1640		}
1641
1642# Check for potential 'bare' types
1643		my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
1644		    $realline_next);
1645		if ($realcnt && $line =~ /.\s*\S/) {
1646			($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1647				ctx_statement_block($linenr, $realcnt, 0);
1648			$stat =~ s/\n./\n /g;
1649			$cond =~ s/\n./\n /g;
1650
1651			# Find the real next line.
1652			$realline_next = $line_nr_next;
1653			if (defined $realline_next &&
1654			    (!defined $lines[$realline_next - 1] ||
1655			     substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
1656				$realline_next++;
1657			}
1658
1659			my $s = $stat;
1660			$s =~ s/{.*$//s;
1661
1662			# Ignore goto labels.
1663			if ($s =~ /$Ident:\*$/s) {
1664
1665			# Ignore functions being called
1666			} elsif ($s =~ /^.\s*$Ident\s*\(/s) {
1667
1668			} elsif ($s =~ /^.\s*else\b/s) {
1669
1670			# declarations always start with types
1671			} elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
1672				my $type = $1;
1673				$type =~ s/\s+/ /g;
1674				possible($type, "A:" . $s);
1675
1676			# definitions in global scope can only start with types
1677			} elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
1678				possible($1, "B:" . $s);
1679			}
1680
1681			# any (foo ... *) is a pointer cast, and foo is a type
1682			while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
1683				possible($1, "C:" . $s);
1684			}
1685
1686			# Check for any sort of function declaration.
1687			# int foo(something bar, other baz);
1688			# void (*store_gdt)(x86_descr_ptr *);
1689			if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
1690				my ($name_len) = length($1);
1691
1692				my $ctx = $s;
1693				substr($ctx, 0, $name_len + 1, '');
1694				$ctx =~ s/\)[^\)]*$//;
1695
1696				for my $arg (split(/\s*,\s*/, $ctx)) {
1697					if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
1698
1699						possible($1, "D:" . $s);
1700					}
1701				}
1702			}
1703
1704		}
1705
1706#
1707# Checks which may be anchored in the context.
1708#
1709
1710# Check for switch () and associated case and default
1711# statements should be at the same indent.
1712		if ($line=~/\bswitch\s*\(.*\)/) {
1713			my $err = '';
1714			my $sep = '';
1715			my @ctx = ctx_block_outer($linenr, $realcnt);
1716			shift(@ctx);
1717			for my $ctx (@ctx) {
1718				my ($clen, $cindent) = line_stats($ctx);
1719				if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
1720							$indent != $cindent) {
1721					$err .= "$sep$ctx\n";
1722					$sep = '';
1723				} else {
1724					$sep = "[...]\n";
1725				}
1726			}
1727			if ($err ne '') {
1728				ERROR("switch and case should be at the same indent\n$hereline$err");
1729			}
1730		}
1731
1732# if/while/etc brace do not go on next line, unless defining a do while loop,
1733# or if that brace on the next line is for something else
1734		if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
1735			my $pre_ctx = "$1$2";
1736
1737			my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
1738			my $ctx_cnt = $realcnt - $#ctx - 1;
1739			my $ctx = join("\n", @ctx);
1740
1741			my $ctx_ln = $linenr;
1742			my $ctx_skip = $realcnt;
1743
1744			while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
1745					defined $lines[$ctx_ln - 1] &&
1746					$lines[$ctx_ln - 1] =~ /^-/)) {
1747				##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
1748				$ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
1749				$ctx_ln++;
1750			}
1751
1752			#print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
1753			#print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
1754
1755			# The length of the "previous line" is checked against 80 because it
1756			# includes the + at the beginning of the line (if the actual line has
1757			# 79 or 80 characters, it is no longer possible to add a space and an
1758			# opening brace there)
1759			if ($#ctx == 0 && $ctx !~ /{\s*/ &&
1760			    defined($lines[$ctx_ln - 1]) && $lines[$ctx_ln - 1] =~ /^\+\s*\{/ &&
1761			    defined($lines[$ctx_ln - 2]) && length($lines[$ctx_ln - 2]) < 80) {
1762				ERROR("that open brace { should be on the previous line\n" .
1763					"$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1764			}
1765			if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
1766			    $ctx =~ /\)\s*\;\s*$/ &&
1767			    defined $lines[$ctx_ln - 1])
1768			{
1769				my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
1770				if ($nindent > $indent) {
1771					ERROR("trailing semicolon indicates no statements, indent implies otherwise\n" .
1772						"$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1773				}
1774			}
1775		}
1776
1777# 'do ... while (0/false)' only makes sense in macros, without trailing ';'
1778		if ($line =~ /while\s*\((0|false)\);/) {
1779			ERROR("suspicious ; after while (0)\n" . $herecurr);
1780		}
1781
1782# Check superfluous trailing ';'
1783		if ($line =~ /;;$/) {
1784			ERROR("superfluous trailing semicolon\n" . $herecurr);
1785		}
1786
1787# Check relative indent for conditionals and blocks.
1788		if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
1789			my ($s, $c) = ($stat, $cond);
1790
1791			substr($s, 0, length($c), '');
1792
1793			# Make sure we remove the line prefixes as we have
1794			# none on the first line, and are going to re-add them
1795			# where necessary.
1796			$s =~ s/\n./\n/gs;
1797
1798			# Find out how long the conditional actually is.
1799			my @newlines = ($c =~ /\n/gs);
1800			my $cond_lines = 1 + $#newlines;
1801
1802			# We want to check the first line inside the block
1803			# starting at the end of the conditional, so remove:
1804			#  1) any blank line termination
1805			#  2) any opening brace { on end of the line
1806			#  3) any do (...) {
1807			my $continuation = 0;
1808			my $check = 0;
1809			$s =~ s/^.*\bdo\b//;
1810			$s =~ s/^\s*\{//;
1811			if ($s =~ s/^\s*\\//) {
1812				$continuation = 1;
1813			}
1814			if ($s =~ s/^\s*?\n//) {
1815				$check = 1;
1816				$cond_lines++;
1817			}
1818
1819			# Also ignore a loop construct at the end of a
1820			# preprocessor statement.
1821			if (($prevline =~ /^.\s*#\s*define\s/ ||
1822			    $prevline =~ /\\\s*$/) && $continuation == 0) {
1823				$check = 0;
1824			}
1825
1826			my $cond_ptr = -1;
1827			$continuation = 0;
1828			while ($cond_ptr != $cond_lines) {
1829				$cond_ptr = $cond_lines;
1830
1831				# If we see an #else/#elif then the code
1832				# is not linear.
1833				if ($s =~ /^\s*\#\s*(?:else|elif)/) {
1834					$check = 0;
1835				}
1836
1837				# Ignore:
1838				#  1) blank lines, they should be at 0,
1839				#  2) preprocessor lines, and
1840				#  3) labels.
1841				if ($continuation ||
1842				    $s =~ /^\s*?\n/ ||
1843				    $s =~ /^\s*#\s*?/ ||
1844				    $s =~ /^\s*$Ident\s*:/) {
1845					$continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
1846					if ($s =~ s/^.*?\n//) {
1847						$cond_lines++;
1848					}
1849				}
1850			}
1851
1852			my (undef, $sindent) = line_stats("+" . $s);
1853			my $stat_real = raw_line($linenr, $cond_lines);
1854
1855			# Check if either of these lines are modified, else
1856			# this is not this patch's fault.
1857			if (!defined($stat_real) ||
1858			    $stat !~ /^\+/ && $stat_real !~ /^\+/) {
1859				$check = 0;
1860			}
1861			if (defined($stat_real) && $cond_lines > 1) {
1862				$stat_real = "[...]\n$stat_real";
1863			}
1864
1865			#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";
1866
1867			if ($check && (($sindent % 4) != 0 ||
1868			    ($sindent <= $indent && $s ne ''))) {
1869				ERROR("suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
1870			}
1871		}
1872
1873		# Track the 'values' across context and added lines.
1874		my $opline = $line; $opline =~ s/^./ /;
1875		my ($curr_values, $curr_vars) =
1876				annotate_values($opline . "\n", $prev_values);
1877		$curr_values = $prev_values . $curr_values;
1878		if ($dbg_values) {
1879			my $outline = $opline; $outline =~ s/\t/ /g;
1880			print "$linenr > .$outline\n";
1881			print "$linenr > $curr_values\n";
1882			print "$linenr >  $curr_vars\n";
1883		}
1884		$prev_values = substr($curr_values, -1);
1885
1886#ignore lines not being added
1887		if ($line=~/^[^\+]/) {next;}
1888
1889# TEST: allow direct testing of the type matcher.
1890		if ($dbg_type) {
1891			if ($line =~ /^.\s*$Declare\s*$/) {
1892				ERROR("TEST: is type\n" . $herecurr);
1893			} elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
1894				ERROR("TEST: is not type ($1 is)\n". $herecurr);
1895			}
1896			next;
1897		}
1898# TEST: allow direct testing of the attribute matcher.
1899		if ($dbg_attr) {
1900			if ($line =~ /^.\s*$Modifier\s*$/) {
1901				ERROR("TEST: is attr\n" . $herecurr);
1902			} elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
1903				ERROR("TEST: is not attr ($1 is)\n". $herecurr);
1904			}
1905			next;
1906		}
1907
1908# check for initialisation to aggregates open brace on the next line
1909		if ($line =~ /^.\s*\{/ &&
1910		    $prevline =~ /(?:^|[^=])=\s*$/) {
1911			ERROR("that open brace { should be on the previous line\n" . $hereprev);
1912		}
1913
1914#
1915# Checks which are anchored on the added line.
1916#
1917
1918# check for malformed paths in #include statements (uses RAW line)
1919		if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
1920			my $path = $1;
1921			if ($path =~ m{//}) {
1922				ERROR("malformed #include filename\n" .
1923					$herecurr);
1924			}
1925		}
1926
1927# Remove C99 comments.
1928		$line =~ s@//.*@@;
1929		$opline =~ s@//.*@@;
1930
1931# check for global initialisers.
1932#		if ($line =~ /^.$Type\s*$Ident\s*(?:\s+$Modifier)*\s*=\s*(0|NULL|false)\s*;/) {
1933#			ERROR("do not initialise globals to 0 or NULL\n" .
1934#				$herecurr);
1935#		}
1936# check for static initialisers.
1937#		if ($line =~ /\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
1938#			ERROR("do not initialise statics to 0 or NULL\n" .
1939#				$herecurr);
1940#		}
1941
1942# * goes on variable not on type
1943		# (char*[ const])
1944		if ($line =~ m{\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\)}) {
1945			my ($from, $to) = ($1, $1);
1946
1947			# Should start with a space.
1948			$to =~ s/^(\S)/ $1/;
1949			# Should not end with a space.
1950			$to =~ s/\s+$//;
1951			# '*'s should not have spaces between.
1952			while ($to =~ s/\*\s+\*/\*\*/) {
1953			}
1954
1955			#print "from<$from> to<$to>\n";
1956			if ($from ne $to) {
1957				ERROR("\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr);
1958			}
1959		} elsif ($line =~ m{\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident)}) {
1960			my ($from, $to, $ident) = ($1, $1, $2);
1961
1962			# Should start with a space.
1963			$to =~ s/^(\S)/ $1/;
1964			# Should not end with a space.
1965			$to =~ s/\s+$//;
1966			# '*'s should not have spaces between.
1967			while ($to =~ s/\*\s+\*/\*\*/) {
1968			}
1969			# Modifiers should have spaces.
1970			$to =~ s/(\b$Modifier$)/$1 /;
1971
1972			#print "from<$from> to<$to> ident<$ident>\n";
1973			if ($from ne $to && $ident !~ /^$Modifier$/) {
1974				ERROR("\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr);
1975			}
1976		}
1977
1978# function brace can't be on same line, except for #defines of do while,
1979# or if closed on same line
1980		if (($line=~/$Type\s*$Ident\(.*\).*\s\{/) and
1981		    !($line=~/\#\s*define.*do\s\{/) and !($line=~/}/)) {
1982			ERROR("open brace '{' following function declarations go on the next line\n" . $herecurr);
1983		}
1984
1985# missing space after union, struct or enum definition
1986		if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?(?:\s+$Ident)?[=\{]/) {
1987		    ERROR("missing space after $1 definition\n" . $herecurr);
1988		}
1989
1990# check for spacing round square brackets; allowed:
1991#  1. with a type on the left -- int [] a;
1992#  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
1993#  3. inside a curly brace -- = { [0...10] = 5 }
1994#  4. after a comma -- [1] = 5, [2] = 6
1995#  5. in a macro definition -- #define abc(x) [x] = y
1996		while ($line =~ /(.*?\s)\[/g) {
1997			my ($where, $prefix) = ($-[1], $1);
1998			if ($prefix !~ /$Type\s+$/ &&
1999			    ($where != 0 || $prefix !~ /^.\s+$/) &&
2000			    $prefix !~ /\#\s*define[^(]*\([^)]*\)\s+$/ &&
2001			    $prefix !~ /[,{:]\s+$/) {
2002				ERROR("space prohibited before open square bracket '['\n" . $herecurr);
2003			}
2004		}
2005
2006# check for spaces between functions and their parentheses.
2007		while ($line =~ /($Ident)\s+\(/g) {
2008			my $name = $1;
2009			my $ctx_before = substr($line, 0, $-[1]);
2010			my $ctx = "$ctx_before$name";
2011
2012			# Ignore those directives where spaces _are_ permitted.
2013			if ($name =~ /^(?:
2014				if|for|while|switch|return|case|
2015				volatile|__volatile__|coroutine_fn|
2016				__attribute__|format|__extension__|
2017				asm|__asm__)$/x)
2018			{
2019
2020			# Ignore 'catch (...)' in C++
2021			} elsif ($name =~ /^catch$/ && $realfile =~ /(\.cpp|\.h)$/) {
2022
2023			# cpp #define statements have non-optional spaces, ie
2024			# if there is a space between the name and the open
2025			# parenthesis it is simply not a parameter group.
2026			} elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
2027
2028			# cpp #elif statement condition may start with a (
2029			} elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
2030
2031			# If this whole things ends with a type its most
2032			# likely a typedef for a function.
2033			} elsif ($ctx =~ /$Type$/) {
2034
2035			} else {
2036				ERROR("space prohibited between function name and open parenthesis '('\n" . $herecurr);
2037			}
2038		}
2039# Check operator spacing.
2040		if (!($line=~/\#\s*include/)) {
2041			my $ops = qr{
2042				<<=|>>=|<=|>=|==|!=|
2043				\+=|-=|\*=|\/=|%=|\^=|\|=|&=|
2044				=>|->|<<|>>|<|>|=|!|~|
2045				&&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
2046				\?|::|:
2047			}x;
2048			my @elements = split(/($ops|;)/, $opline);
2049			my $off = 0;
2050
2051			my $blank = copy_spacing($opline);
2052
2053			for (my $n = 0; $n < $#elements; $n += 2) {
2054				$off += length($elements[$n]);
2055
2056				# Pick up the preceding and succeeding characters.
2057				my $ca = substr($opline, 0, $off);
2058				my $cc = '';
2059				if (length($opline) >= ($off + length($elements[$n + 1]))) {
2060					$cc = substr($opline, $off + length($elements[$n + 1]));
2061				}
2062				my $cb = "$ca$;$cc";
2063
2064				my $a = '';
2065				$a = 'V' if ($elements[$n] ne '');
2066				$a = 'W' if ($elements[$n] =~ /\s$/);
2067				$a = 'C' if ($elements[$n] =~ /$;$/);
2068				$a = 'B' if ($elements[$n] =~ /(\[|\()$/);
2069				$a = 'O' if ($elements[$n] eq '');
2070				$a = 'E' if ($ca =~ /^\s*$/);
2071
2072				my $op = $elements[$n + 1];
2073
2074				my $c = '';
2075				if (defined $elements[$n + 2]) {
2076					$c = 'V' if ($elements[$n + 2] ne '');
2077					$c = 'W' if ($elements[$n + 2] =~ /^\s/);
2078					$c = 'C' if ($elements[$n + 2] =~ /^$;/);
2079					$c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
2080					$c = 'O' if ($elements[$n + 2] eq '');
2081					$c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
2082				} else {
2083					$c = 'E';
2084				}
2085
2086				my $ctx = "${a}x${c}";
2087
2088				my $at = "(ctx:$ctx)";
2089
2090				my $ptr = substr($blank, 0, $off) . "^";
2091				my $hereptr = "$hereline$ptr\n";
2092
2093				# Pull out the value of this operator.
2094				my $op_type = substr($curr_values, $off + 1, 1);
2095
2096				# Get the full operator variant.
2097				my $opv = $op . substr($curr_vars, $off, 1);
2098
2099				# Ignore operators passed as parameters.
2100				if ($op_type ne 'V' &&
2101				    $ca =~ /\s$/ && $cc =~ /^\s*,/) {
2102
2103#				# Ignore comments
2104#				} elsif ($op =~ /^$;+$/) {
2105
2106				# ; should have either the end of line or a space or \ after it
2107				} elsif ($op eq ';') {
2108					if ($ctx !~ /.x[WEBC]/ &&
2109					    $cc !~ /^\\/ && $cc !~ /^;/) {
2110						ERROR("space required after that '$op' $at\n" . $hereptr);
2111					}
2112
2113				# // is a comment
2114				} elsif ($op eq '//') {
2115
2116				# Ignore : used in class declaration in C++
2117				} elsif ($opv eq ':B' && $ctx =~ /Wx[WE]/ &&
2118						 $line =~ /class/ && $realfile =~ /(\.cpp|\.h)$/) {
2119
2120				# No spaces for:
2121				#   ->
2122				#   :   when part of a bitfield
2123				} elsif ($op eq '->' || $opv eq ':B') {
2124					if ($ctx =~ /Wx.|.xW/) {
2125						ERROR("spaces prohibited around that '$op' $at\n" . $hereptr);
2126					}
2127
2128				# , must have a space on the right.
2129                                # not required when having a single },{ on one line
2130				} elsif ($op eq ',') {
2131					if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/ &&
2132                                            ($elements[$n] . $elements[$n + 2]) !~ " *}\\{") {
2133						ERROR("space required after that '$op' $at\n" . $hereptr);
2134					}
2135
2136				# '*' as part of a type definition -- reported already.
2137				} elsif ($opv eq '*_') {
2138					#warn "'*' is part of type\n";
2139
2140				# unary operators should have a space before and
2141				# none after.  May be left adjacent to another
2142				# unary operator, or a cast
2143				} elsif ($op eq '!' || $op eq '~' ||
2144					 $opv eq '*U' || $opv eq '-U' ||
2145					 $opv eq '&U' || $opv eq '&&U') {
2146					if ($op eq '~' && $ca =~ /::$/ && $realfile =~ /(\.cpp|\.h)$/) {
2147						# '~' used as a name of Destructor
2148
2149					} elsif ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
2150						ERROR("space required before that '$op' $at\n" . $hereptr);
2151					}
2152					if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
2153						# A unary '*' may be const
2154
2155					} elsif ($ctx =~ /.xW/) {
2156						ERROR("space prohibited after that '$op' $at\n" . $hereptr);
2157					}
2158
2159				# unary ++ and unary -- are allowed no space on one side.
2160				} elsif ($op eq '++' or $op eq '--') {
2161					if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
2162						ERROR("space required one side of that '$op' $at\n" . $hereptr);
2163					}
2164					if ($ctx =~ /Wx[BE]/ ||
2165					    ($ctx =~ /Wx./ && $cc =~ /^;/)) {
2166						ERROR("space prohibited before that '$op' $at\n" . $hereptr);
2167					}
2168					if ($ctx =~ /ExW/) {
2169						ERROR("space prohibited after that '$op' $at\n" . $hereptr);
2170					}
2171
2172				# A colon needs no spaces before when it is
2173				# terminating a case value or a label.
2174				} elsif ($opv eq ':C' || $opv eq ':L') {
2175					if ($ctx =~ /Wx./) {
2176						ERROR("space prohibited before that '$op' $at\n" . $hereptr);
2177					}
2178
2179				# All the others need spaces both sides.
2180				} elsif ($ctx !~ /[EWC]x[CWE]/) {
2181					my $ok = 0;
2182
2183					if ($realfile =~ /\.cpp|\.h$/) {
2184						# Ignore template arguments <...> in C++
2185						if (($op eq '<' || $op eq '>') && $line =~ /<.*>/) {
2186							$ok = 1;
2187						}
2188
2189						# Ignore :: in C++
2190						if ($op eq '::') {
2191							$ok = 1;
2192						}
2193					}
2194
2195					# Ignore email addresses <foo@bar>
2196					if (($op eq '<' &&
2197					     $cc =~ /^\S+\@\S+>/) ||
2198					    ($op eq '>' &&
2199					     $ca =~ /<\S+\@\S+$/))
2200					{
2201						$ok = 1;
2202					}
2203
2204					# Ignore ?:
2205					if (($opv eq ':O' && $ca =~ /\?$/) ||
2206					    ($op eq '?' && $cc =~ /^:/)) {
2207						$ok = 1;
2208					}
2209
2210					if ($ok == 0) {
2211						ERROR("spaces required around that '$op' $at\n" . $hereptr);
2212					}
2213				}
2214				$off += length($elements[$n + 1]);
2215			}
2216		}
2217
2218#need space before brace following if, while, etc
2219		if (($line =~ /\(.*\)\{/ && $line !~ /\($Type\)\{/) ||
2220		    $line =~ /do\{/) {
2221			ERROR("space required before the open brace '{'\n" . $herecurr);
2222		}
2223
2224# closing brace should have a space following it when it has anything
2225# on the line
2226		if ($line =~ /}(?!(?:,|;|\)))\S/) {
2227			ERROR("space required after that close brace '}'\n" . $herecurr);
2228		}
2229
2230# check spacing on square brackets
2231		if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
2232			ERROR("space prohibited after that open square bracket '['\n" . $herecurr);
2233		}
2234		if ($line =~ /\s\]/) {
2235			ERROR("space prohibited before that close square bracket ']'\n" . $herecurr);
2236		}
2237
2238# check spacing on parentheses
2239		if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
2240		    $line !~ /for\s*\(\s+;/) {
2241			ERROR("space prohibited after that open parenthesis '('\n" . $herecurr);
2242		}
2243		if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
2244		    $line !~ /for\s*\(.*;\s+\)/ &&
2245		    $line !~ /:\s+\)/) {
2246			ERROR("space prohibited before that close parenthesis ')'\n" . $herecurr);
2247		}
2248
2249		if ($line =~ /^.\s*(Q(?:S?LIST|SIMPLEQ|TAILQ)_HEAD)\s*\(\s*[^,]/ &&
2250		    $line !~ /^.typedef/) {
2251		    ERROR("named $1 should be typedefed separately\n" . $herecurr);
2252		}
2253
2254# Return needs parens
2255		if ($line =~ /^.\s*return [^(]/) {
2256		    ERROR("parentheses required on return\n" . $herecurr);
2257		}
2258
2259# Need a space before open parenthesis after if, while etc
2260		if ($line=~/\b(if|while|for|switch|return)\(/) {
2261			ERROR("space required before the open parenthesis '('\n" . $herecurr);
2262		}
2263
2264# Check for illegal assignment in if conditional -- and check for trailing
2265# statements after the conditional.
2266		if ($line =~ /do\s*(?!{)/) {
2267			my ($stat_next) = ctx_statement_block($line_nr_next,
2268						$remain_next, $off_next);
2269			$stat_next =~ s/\n./\n /g;
2270			##print "stat<$stat> stat_next<$stat_next>\n";
2271
2272			if ($stat_next =~ /^\s*while\b/) {
2273				# If the statement carries leading newlines,
2274				# then count those as offsets.
2275				my ($whitespace) =
2276					($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
2277				my $offset =
2278					statement_rawlines($whitespace) - 1;
2279
2280				$suppress_whiletrailers{$line_nr_next +
2281								$offset} = 1;
2282			}
2283		}
2284		if (!defined $suppress_whiletrailers{$linenr} &&
2285		    $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
2286			my ($s, $c) = ($stat, $cond);
2287
2288#			if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
2289#				ERROR("do not use assignment in if condition\n" . $herecurr);
2290#			}
2291
2292			# Find out what is on the end of the line after the
2293			# conditional.
2294			substr($s, 0, length($c), '');
2295			$s =~ s/\n.*//g;
2296			$s =~ s/$;//g; 	# Remove any comments
2297			if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
2298			    $c !~ /}\s*while\s*/)
2299			{
2300				# Find out how long the conditional actually is.
2301				my @newlines = ($c =~ /\n/gs);
2302				my $cond_lines = 1 + $#newlines;
2303				my $stat_real = '';
2304
2305				$stat_real = raw_line($linenr, $cond_lines)
2306							. "\n" if ($cond_lines);
2307				if (defined($stat_real) && $cond_lines > 1) {
2308					$stat_real = "[...]\n$stat_real";
2309				}
2310
2311				ERROR("trailing statements should be on next line\n" . $herecurr . $stat_real);
2312			}
2313		}
2314
2315# Check for bitwise tests written as boolean
2316		if ($line =~ /
2317			(?:
2318				(?:\[|\(|\&\&|\|\|)
2319				\s*0[xX][0-9]+\s*
2320				(?:\&\&|\|\|)
2321			|
2322				(?:\&\&|\|\|)
2323				\s*0[xX][0-9]+\s*
2324				(?:\&\&|\|\||\)|\])
2325			)/x)
2326		{
2327			ERROR("boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
2328		}
2329
2330# if and else should not have general statements after it
2331		if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
2332			my $s = $1;
2333			$s =~ s/$;//g; 	# Remove any comments
2334			if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
2335				ERROR("trailing statements should be on next line\n" . $herecurr);
2336			}
2337		}
2338# if should not continue a brace
2339		if ($line =~ /}\s*if\b/) {
2340			ERROR("trailing statements should be on next line\n" .
2341				$herecurr);
2342		}
2343# case and default should not have general statements after them
2344		if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
2345		    $line !~ /\G(?:
2346			(?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
2347			\s*return\s+
2348		    )/xg)
2349		{
2350			ERROR("trailing statements should be on next line\n" . $herecurr);
2351		}
2352
2353		# Check for }<nl>else {, these must be at the same
2354		# indent level to be relevant to each other.
2355		if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
2356						$previndent == $indent) {
2357			ERROR("else should follow close brace '}'\n" . $hereprev);
2358		}
2359
2360		if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and
2361						$previndent == $indent) {
2362			my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
2363
2364			# Find out what is on the end of the line after the
2365			# conditional.
2366			substr($s, 0, length($c), '');
2367			$s =~ s/\n.*//g;
2368
2369			if ($s =~ /^\s*;/) {
2370				ERROR("while should follow close brace '}'\n" . $hereprev);
2371			}
2372		}
2373
2374#no spaces allowed after \ in define
2375		if ($line=~/\#\s*define.*\\\s$/) {
2376			ERROR("Whitespace after \\ makes next lines useless\n" . $herecurr);
2377		}
2378
2379# multi-statement macros should be enclosed in a do while loop, grab the
2380# first statement and ensure its the whole macro if its not enclosed
2381# in a known good container
2382		if ($realfile !~ m@/vmlinux.lds.h$@ &&
2383		    $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
2384			my $ln = $linenr;
2385			my $cnt = $realcnt;
2386			my ($off, $dstat, $dcond, $rest);
2387			my $ctx = '';
2388
2389			my $args = defined($1);
2390
2391			# Find the end of the macro and limit our statement
2392			# search to that.
2393			while ($cnt > 0 && defined $lines[$ln - 1] &&
2394				$lines[$ln - 1] =~ /^(?:-|..*\\$)/)
2395			{
2396				$ctx .= $rawlines[$ln - 1] . "\n";
2397				$cnt-- if ($lines[$ln - 1] !~ /^-/);
2398				$ln++;
2399			}
2400			$ctx .= $rawlines[$ln - 1];
2401
2402			($dstat, $dcond, $ln, $cnt, $off) =
2403				ctx_statement_block($linenr, $ln - $linenr + 1, 0);
2404			#print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
2405			#print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
2406
2407			# Extract the remainder of the define (if any) and
2408			# rip off surrounding spaces, and trailing \'s.
2409			$rest = '';
2410			while ($off != 0 || ($cnt > 0 && $rest =~ /\\\s*$/)) {
2411				#print "ADDING cnt<$cnt> $off <" . substr($lines[$ln - 1], $off) . "> rest<$rest>\n";
2412				if ($off != 0 || $lines[$ln - 1] !~ /^-/) {
2413					$rest .= substr($lines[$ln - 1], $off) . "\n";
2414					$cnt--;
2415				}
2416				$ln++;
2417				$off = 0;
2418			}
2419			$rest =~ s/\\\n.//g;
2420			$rest =~ s/^\s*//s;
2421			$rest =~ s/\s*$//s;
2422
2423			# Clean up the original statement.
2424			if ($args) {
2425				substr($dstat, 0, length($dcond), '');
2426			} else {
2427				$dstat =~ s/^.\s*\#\s*define\s+$Ident\s*//;
2428			}
2429			$dstat =~ s/$;//g;
2430			$dstat =~ s/\\\n.//g;
2431			$dstat =~ s/^\s*//s;
2432			$dstat =~ s/\s*$//s;
2433
2434			# Flatten any parentheses and braces
2435			while ($dstat =~ s/\([^\(\)]*\)/1/ ||
2436			       $dstat =~ s/\{[^\{\}]*\}/1/ ||
2437			       $dstat =~ s/\[[^\{\}]*\]/1/)
2438			{
2439			}
2440
2441			my $exceptions = qr{
2442				$Declare|
2443				module_param_named|
2444				MODULE_PARAM_DESC|
2445				DECLARE_PER_CPU|
2446				DEFINE_PER_CPU|
2447				__typeof__\(|
2448				union|
2449				struct|
2450				\.$Ident\s*=\s*|
2451				^\"|\"$
2452			}x;
2453			#print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
2454			if ($rest ne '' && $rest ne ',') {
2455				if ($rest !~ /while\s*\(/ &&
2456				    $dstat !~ /$exceptions/)
2457				{
2458					ERROR("Macros with multiple statements should be enclosed in a do - while loop\n" . "$here\n$ctx\n");
2459				}
2460
2461			} elsif ($ctx !~ /;/) {
2462				if ($dstat ne '' &&
2463				    $dstat !~ /^(?:$Ident|-?$Constant)$/ &&
2464				    $dstat !~ /$exceptions/ &&
2465				    $dstat !~ /^\.$Ident\s*=/ &&
2466				    $dstat =~ /$Operators/)
2467				{
2468					ERROR("Macros with complex values should be enclosed in parenthesis\n" . "$here\n$ctx\n");
2469				}
2470			}
2471		}
2472
2473# check for missing bracing around if etc
2474		if ($line =~ /(^.*)\b(?:if|while|for)\b/ &&
2475			$line !~ /\#\s*if/) {
2476			my $allowed = 0;
2477
2478			# Check the pre-context.
2479			if ($line =~ /(\}.*?)$/) {
2480				my $pre = $1;
2481
2482				if ($line !~ /else/) {
2483					print "APW: ALLOWED: pre<$pre> line<$line>\n"
2484						if $dbg_adv_apw;
2485					$allowed = 1;
2486				}
2487			}
2488			my ($level, $endln, @chunks) =
2489				ctx_statement_full($linenr, $realcnt, 1);
2490                        if ($dbg_adv_apw) {
2491                            print "APW: chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
2492                            print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n"
2493                                if $#chunks >= 1;
2494                        }
2495			if ($#chunks >= 0 && $level == 0) {
2496				my $seen = 0;
2497				my $herectx = $here . "\n";
2498				my $ln = $linenr - 1;
2499				for my $chunk (@chunks) {
2500					my ($cond, $block) = @{$chunk};
2501
2502					# If the condition carries leading newlines, then count those as offsets.
2503					my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
2504					my $offset = statement_rawlines($whitespace) - 1;
2505
2506					#print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
2507
2508					# We have looked at and allowed this specific line.
2509					$suppress_ifbraces{$ln + $offset} = 1;
2510
2511					$herectx .= "$rawlines[$ln + $offset]\n[...]\n";
2512					$ln += statement_rawlines($block) - 1;
2513
2514					substr($block, 0, length($cond), '');
2515
2516					my $spaced_block = $block;
2517					$spaced_block =~ s/\n\+/ /g;
2518
2519					$seen++ if ($spaced_block =~ /^\s*\{/);
2520
2521                                        print "APW: cond<$cond> block<$block> allowed<$allowed>\n"
2522                                            if $dbg_adv_apw;
2523					if (statement_lines($cond) > 1) {
2524                                            print "APW: ALLOWED: cond<$cond>\n"
2525                                                if $dbg_adv_apw;
2526                                            $allowed = 1;
2527					}
2528					if ($block =~/\b(?:if|for|while)\b/) {
2529                                            print "APW: ALLOWED: block<$block>\n"
2530                                                if $dbg_adv_apw;
2531                                            $allowed = 1;
2532					}
2533					if (statement_block_size($block) > 1) {
2534                                            print "APW: ALLOWED: lines block<$block>\n"
2535                                                if $dbg_adv_apw;
2536                                            $allowed = 1;
2537					}
2538				}
2539				$allowed=1; # disable for now.
2540				if ($seen != ($#chunks + 1) && !$allowed) {
2541					ERROR("braces {} are necessary for all arms of this statement\n" . $herectx);
2542				}
2543			}
2544		}
2545		if (!defined $suppress_ifbraces{$linenr - 1} &&
2546					$line =~ /\b(if|while|for|else)\b/ &&
2547					$line !~ /\#\s*if/ &&
2548					$line !~ /\#\s*else/) {
2549			my $allowed = 0;
2550
2551                        # Check the pre-context.
2552                        if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
2553                            my $pre = $1;
2554
2555                            if ($line !~ /else/) {
2556                                print "APW: ALLOWED: pre<$pre> line<$line>\n"
2557                                    if $dbg_adv_apw;
2558                                $allowed = 1;
2559                            }
2560                        }
2561
2562			my ($level, $endln, @chunks) =
2563				ctx_statement_full($linenr, $realcnt, $-[0]);
2564
2565			# Check the condition.
2566			my ($cond, $block) = @{$chunks[0]};
2567                        print "CHECKING<$linenr> cond<$cond> block<$block>\n"
2568                            if $dbg_adv_checking;
2569			if (defined $cond) {
2570				substr($block, 0, length($cond), '');
2571			}
2572			if (statement_lines($cond) > 1) {
2573                            print "APW: ALLOWED: cond<$cond>\n"
2574                                if $dbg_adv_apw;
2575                            $allowed = 1;
2576			}
2577			if ($block =~/\b(?:if|for|while)\b/) {
2578                            print "APW: ALLOWED: block<$block>\n"
2579                                if $dbg_adv_apw;
2580                            $allowed = 1;
2581			}
2582			if (statement_block_size($block) > 1) {
2583                            print "APW: ALLOWED: lines block<$block>\n"
2584                                if $dbg_adv_apw;
2585                            $allowed = 1;
2586			}
2587			# Check the post-context.
2588			if (defined $chunks[1]) {
2589				my ($cond, $block) = @{$chunks[1]};
2590				if (defined $cond) {
2591					substr($block, 0, length($cond), '');
2592				}
2593				if ($block =~ /^\s*\{/) {
2594                                    print "APW: ALLOWED: chunk-1 block<$block>\n"
2595                                        if $dbg_adv_apw;
2596                                    $allowed = 1;
2597				}
2598			}
2599                        print "DCS: level=$level block<$block> allowed=$allowed\n"
2600                            if $dbg_adv_dcs;
2601			if ($level == 0 && $block !~ /^\s*\{/ && !$allowed) {
2602				my $herectx = $here . "\n";;
2603				my $cnt = statement_rawlines($block);
2604
2605				for (my $n = 0; $n < $cnt; $n++) {
2606					$herectx .= raw_line($linenr, $n) . "\n";;
2607				}
2608
2609				ERROR("braces {} are necessary even for single statement blocks\n" . $herectx);
2610			}
2611		}
2612
2613# warn about #if 0
2614		if ($line =~ /^.\s*\#\s*if\s+0\b/) {
2615			ERROR("if this code is redundant consider removing it\n" .
2616				$herecurr);
2617		}
2618
2619# Check that the storage class is at the beginning of a declaration
2620		if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
2621			ERROR("storage class should be at the beginning of the declaration\n" . $herecurr)
2622		}
2623
2624# check the location of the inline attribute, that it is between
2625# storage class and type.
2626		if ($line =~ /\b$Type\s+$Inline\b/ ||
2627		    $line =~ /\b$Inline\s+$Storage\b/) {
2628			ERROR("inline keyword should sit between storage class and type\n" . $herecurr);
2629		}
2630
2631# check for sizeof(&)
2632		if ($line =~ /\bsizeof\s*\(\s*\&/) {
2633			ERROR("sizeof(& should be avoided\n" . $herecurr);
2634		}
2635
2636# check for new externs in .c files.
2637		if ($realfile =~ /\.c$/ && defined $stat &&
2638		    $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
2639		{
2640			my $function_name = $1;
2641			my $paren_space = $2;
2642
2643			my $s = $stat;
2644			if (defined $cond) {
2645				substr($s, 0, length($cond), '');
2646			}
2647			if ($s =~ /^\s*;/ &&
2648			    $function_name ne 'uninitialized_var')
2649			{
2650				ERROR("externs should be avoided in .c files\n" .  $herecurr);
2651			}
2652
2653			if ($paren_space =~ /\n/) {
2654				ERROR("arguments for function declarations should follow identifier\n" . $herecurr);
2655			}
2656
2657		} elsif ($realfile =~ /\.c$/ && defined $stat &&
2658		    $stat =~ /^.\s*extern\s+/)
2659		{
2660			ERROR("externs should be avoided in .c files\n" .  $herecurr);
2661		}
2662
2663# check for gcc specific __FUNCTION__
2664		if ($line =~ /__FUNCTION__/) {
2665			ERROR("__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr);
2666		}
2667
2668# recommend sigaction over signal for portability, when establishing a handler
2669		if ($line =~ /\bsignal\s*\(/ && !($line =~ /SIG_(?:IGN|DFL)/)) {
2670			ERROR("use sigaction to establish signal handlers; signal is not portable\n" . $herecurr);
2671		}
2672
2673# format strings checks
2674		my $string;
2675		while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
2676			$string = substr($rawline, $-[1], $+[1] - $-[1]);
2677			$string =~ s/%%/__/g;
2678			# check for %L{u,d,i} in strings
2679			if ($string =~ /(?<!%)%L[udi]/) {
2680				ERROR("\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
2681			}
2682		}
2683
2684	# Continue checking for error messages that contains newlines. This
2685	# check handles cases where string literals are spread over multiple lines.
2686	# Example:
2687	# error_report("Error msg line #1"
2688	#              "Error msg line #2\n");
2689	my $quoted_newline_regex = qr{\+\s*\".*\\n.*\"};
2690	my $continued_str_literal = qr{\+\s*\".*\"};
2691
2692	if ($rawline =~ /$quoted_newline_regex/) {
2693		# Backtrack to first line that does not contain only a quoted literal
2694		# and assume that it is the start of the statement.
2695		my $i = $linenr - 2;
2696
2697		while (($i >= 0) & $rawlines[$i] =~ /$continued_str_literal/) {
2698			$i--;
2699		}
2700	}
2701
2702	}
2703
2704	# If we have no input at all, then there is nothing to report on
2705	# so just keep quiet.
2706	if ($#rawlines == -1) {
2707		return 1;
2708	}
2709
2710	# In mailback mode only produce a report in the negative, for
2711	# things that appear to be patches.
2712	if ($mailback && ($clean == 1 || !$is_patch)) {
2713		return 1;
2714	}
2715
2716	# This is not a patch, and we are are in 'no-patch' mode so
2717	# just keep quiet.
2718	if (!$chk_patch && !$is_patch) {
2719		return 1;
2720	}
2721
2722	if (!$is_patch && $filename !~ /cover-letter\.patch$/) {
2723		ERROR("Does not appear to be a unified-diff format patch\n");
2724	}
2725
2726	print report_dump();
2727	if ($summary && !($clean == 1 && $quiet == 1)) {
2728		print "$filename " if ($summary_file);
2729		print "total: $cnt_error errors, $cnt_warn warnings, " .
2730			"$cnt_lines lines checked\n";
2731		print "\n" if ($quiet == 0);
2732	}
2733
2734	if ($quiet == 0) {
2735		# If there were whitespace errors which cleanpatch can fix
2736		# then suggest that.
2737#		if ($rpt_cleaners) {
2738#			print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
2739#			print "      scripts/cleanfile\n\n";
2740#		}
2741	}
2742
2743	if ($clean == 1 && $quiet == 0) {
2744		print "$vname has no obvious style problems and is ready for submission.\n"
2745	}
2746
2747	return ($no_warnings ? $clean : $cnt_error == 0);
2748}
2749