xref: /freebsd/tools/build/checkstyle9.pl (revision a91a246563dffa876a52f53a98de4af9fa364c52) 
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 $github = 0;
29my $terse = 0;
30my $file = undef;
31my $color = "auto";
32my $no_warnings = 0;
33my $summary = 1;
34my $mailback = 0;
35my $summary_file = 0;
36my $root;
37my %debug;
38my $help = 0;
39
40sub help {
41	my ($exitcode) = @_;
42
43	print << "EOM";
44Usage:
45
46    $P [OPTION]... [FILE]...
47    $P [OPTION]... [GIT-REV-LIST]
48
49Version: $V
50
51Options:
52  -q, --quiet                quiet
53  --patch                    treat FILE as patchfile
54  --branch                   treat args as GIT revision list
55  --emacs                    emacs compile window format
56  --terse                    one line per report
57  -f, --file                 treat FILE as regular source file
58  --strict                   fail if only warnings are found
59  --no-summary               suppress the per-file summary
60  --mailback                 only produce a report in case of warnings/errors
61  --summary-file             include the filename in summary
62  --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
63                             'values', 'possible', 'type', and 'attr' (default
64                             is all off)
65  --test-only=WORD           report only warnings/errors containing WORD
66                             literally
67  --color[=WHEN]             Use colors 'always', 'never', or only when output
68                             is a terminal ('auto'). Default is 'auto'.
69  -h, --help, --version      display this help and exit
70
71When FILE is - read standard input.
72EOM
73
74	exit($exitcode);
75}
76
77# Use at your own risk
78print "\n", MAGENTA, "WARNING:", RESET, " This code is highly experimental ... likely isn't a great style(9) match yet\n\n";
79
80# Perl's Getopt::Long allows options to take optional arguments after a space.
81# Prevent --color by itself from consuming other arguments
82foreach (@ARGV) {
83	if ($_ eq "--color" || $_ eq "-color") {
84		$_ = "--color=$color";
85	}
86}
87
88GetOptions(
89	'q|quiet+'	=> \$quiet,
90	'tree!'		=> \$tree,
91	'signoff!'	=> \$chk_signoff,
92	'patch!'	=> \$chk_patch,
93	'branch!'	=> \$chk_branch,
94	'emacs!'	=> \$emacs,
95	'github!'	=> \$github,
96	'terse!'	=> \$terse,
97	'f|file!'	=> \$file,
98	'strict!'	=> \$no_warnings,
99	'root=s'	=> \$root,
100	'summary!'	=> \$summary,
101	'mailback!'	=> \$mailback,
102	'summary-file!'	=> \$summary_file,
103
104	'debug=s'	=> \%debug,
105	'test-only=s'	=> \$tst_only,
106	'color=s'       => \$color,
107	'no-color'      => sub { $color = 'never'; },
108	'h|help'	=> \$help,
109	'version'	=> \$help
110) or help(1);
111
112help(0) if ($help);
113
114my $exit = 0;
115
116if ($#ARGV < 0) {
117	print "$P: no input files\n";
118	exit(1);
119}
120
121if (!defined $chk_branch && !defined $chk_patch && !defined $file) {
122	$chk_branch = $ARGV[0] =~ /.\.\./ ? 1 : 0;
123	$file = $ARGV[0] =~ /$SrcFile/ ? 1 : 0;
124	$chk_patch = $chk_branch || $file ? 0 : 1;
125} elsif (!defined $chk_branch && !defined $chk_patch) {
126	if ($file) {
127		$chk_branch = $chk_patch = 0;
128	} else {
129		$chk_branch = $ARGV[0] =~ /.\.\./ ? 1 : 0;
130		$chk_patch = $chk_branch ? 0 : 1;
131	}
132} elsif (!defined $chk_branch && !defined $file) {
133	if ($chk_patch) {
134		$chk_branch = $file = 0;
135	} else {
136		$chk_branch = $ARGV[0] =~ /.\.\./ ? 1 : 0;
137		$file = $chk_branch ? 0 : 1;
138	}
139} elsif (!defined $chk_patch && !defined $file) {
140	if ($chk_branch) {
141		$chk_patch = $file = 0;
142	} else {
143		$file = $ARGV[0] =~ /$SrcFile/ ? 1 : 0;
144		$chk_patch = $file ? 0 : 1;
145	}
146} elsif (!defined $chk_branch) {
147	$chk_branch = $chk_patch || $file ? 0 : 1;
148} elsif (!defined $chk_patch) {
149	$chk_patch = $chk_branch || $file ? 0 : 1;
150} elsif (!defined $file) {
151	$file = $chk_patch || $chk_branch ? 0 : 1;
152}
153
154if (($chk_patch && $chk_branch) ||
155    ($chk_patch && $file) ||
156    ($chk_branch && $file)) {
157	die "Only one of --file, --branch, --patch is permitted\n";
158}
159if (!$chk_patch && !$chk_branch && !$file) {
160	die "One of --file, --branch, --patch is required\n";
161}
162
163if ($color =~ /^always$/i) {
164	$color = 1;
165} elsif ($color =~ /^never$/i) {
166	$color = 0;
167} elsif ($color =~ /^auto$/i) {
168	$color = (-t STDOUT);
169} else {
170	die "Invalid color mode: $color\n";
171}
172
173my $dbg_values = 0;
174my $dbg_possible = 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	my $do_color = $color && !$github;
1179	$output .= BOLD if $do_color;
1180	$output .= "::error " if $github && $level eq 'ERROR';
1181	$output .= "::warning " if $github && $level eq 'WARNING';
1182	$output .= $prefix;
1183	$output .= RED if $do_color && $level eq 'ERROR';
1184	$output .= MAGENTA if $do_color && $level eq 'WARNING';
1185	$output .= $level . ':' if !$github;
1186	$output .= RESET if $do_color;
1187	$output .= ' ' if (!$github);
1188	$output .= $msg . "\n";
1189
1190	$output = (split('\n', $output))[0] . "\n" if ($terse);
1191
1192	push(our @report, $output);
1193
1194	return 1;
1195}
1196sub report_dump {
1197	our @report;
1198}
1199sub ERROR {
1200 	if (report("ERROR", $_[0])) {
1201		our $clean = 0;
1202		our $cnt_error++;
1203	}
1204}
1205sub WARN {
1206	if (report("WARNING", $_[0])) {
1207		our $clean = 0;
1208		our $cnt_warn++;
1209	}
1210}
1211
1212# According to tests/qtest/bios-tables-test.c: do not
1213# change expected file in the same commit with adding test
1214sub checkfilename {
1215	my ($name, $acpi_testexpected, $acpi_nontestexpected) = @_;
1216
1217        # Note: shell script that rebuilds the expected files is in the same
1218        # directory as files themselves.
1219        # Note: allowed diff list can be changed both when changing expected
1220        # files and when changing tests.
1221	if ($name =~ m#^tests/data/acpi/# and not $name =~ m#^\.sh$#) {
1222		$$acpi_testexpected = $name;
1223	} elsif ($name !~ m#^tests/qtest/bios-tables-test-allowed-diff.h$#) {
1224		$$acpi_nontestexpected = $name;
1225	}
1226	if (defined $$acpi_testexpected and defined $$acpi_nontestexpected) {
1227		ERROR("Do not add expected files together with tests, " .
1228		      "follow instructions in " .
1229		      "tests/qtest/bios-tables-test.c: both " .
1230		      $$acpi_testexpected . " and " .
1231		      $$acpi_nontestexpected . " found\n");
1232	}
1233}
1234
1235sub process {
1236	my $filename = shift;
1237
1238	my $linenr=0;
1239	my $prevline="";
1240	my $prevrawline="";
1241	my $stashline="";
1242	my $stashrawline="";
1243
1244	my $length;
1245	my $indent;
1246	my $previndent=0;
1247	my $stashindent=0;
1248
1249	our $clean = 1;
1250	my $signoff = 0;
1251	my $is_patch = 0;
1252
1253	my $in_header_lines = $file ? 0 : 1;
1254	my $in_commit_log = 0;		#Scanning lines before patch
1255	my $non_utf8_charset = 0;
1256
1257	our @report = ();
1258	our $cnt_lines = 0;
1259	our $cnt_error = 0;
1260	our $cnt_warn = 0;
1261	our $cnt_chk = 0;
1262
1263	# Trace the real file/line as we go.
1264	my $realfile = '';
1265	my $realline = 0;
1266	my $realcnt = 0;
1267	my $here = '';
1268	my $in_comment = 0;
1269	my $comment_edge = 0;
1270	my $first_line = 0;
1271	my $p1_prefix = '';
1272
1273	my $prev_values = 'E';
1274
1275	# suppression flags
1276	my %suppress_ifbraces;
1277	my %suppress_whiletrailers;
1278	my %suppress_export;
1279
1280        my $acpi_testexpected;
1281        my $acpi_nontestexpected;
1282
1283	# Pre-scan the patch sanitizing the lines.
1284
1285	sanitise_line_reset();
1286	my $line;
1287	foreach my $rawline (@rawlines) {
1288		$linenr++;
1289		$line = $rawline;
1290
1291		if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1292			$realline=$1-1;
1293			if (defined $2) {
1294				$realcnt=$3+1;
1295			} else {
1296				$realcnt=1+1;
1297			}
1298			$in_comment = 0;
1299
1300			# Guestimate if this is a continuing comment.  Run
1301			# the context looking for a comment "edge".  If this
1302			# edge is a close comment then we must be in a comment
1303			# at context start.
1304			my $edge;
1305			my $cnt = $realcnt;
1306			for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1307				next if (defined $rawlines[$ln - 1] &&
1308					 $rawlines[$ln - 1] =~ /^-/);
1309				$cnt--;
1310				#print "RAW<$rawlines[$ln - 1]>\n";
1311				last if (!defined $rawlines[$ln - 1]);
1312				if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1313				    $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1314					($edge) = $1;
1315					last;
1316				}
1317			}
1318			if (defined $edge && $edge eq '*/') {
1319				$in_comment = 1;
1320			}
1321
1322			# Guestimate if this is a continuing comment.  If this
1323			# is the start of a diff block and this line starts
1324			# ' *' then it is very likely a comment.
1325			if (!defined $edge &&
1326			    $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1327			{
1328				$in_comment = 1;
1329			}
1330
1331			##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1332			sanitise_line_reset($in_comment);
1333
1334		} elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1335			# Standardise the strings and chars within the input to
1336			# simplify matching -- only bother with positive lines.
1337			$line = sanitise_line($rawline);
1338		}
1339		push(@lines, $line);
1340
1341		if ($realcnt > 1) {
1342			$realcnt-- if ($line =~ /^(?:\+| |$)/);
1343		} else {
1344			$realcnt = 0;
1345		}
1346
1347		#print "==>$rawline\n";
1348		#print "-->$line\n";
1349	}
1350
1351	$prefix = '';
1352
1353	$realcnt = 0;
1354	$linenr = 0;
1355	foreach my $line (@lines) {
1356		$linenr++;
1357
1358		my $rawline = $rawlines[$linenr - 1];
1359
1360#extract the line range in the file after the patch is applied
1361		if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1362			$is_patch = 1;
1363			$first_line = $linenr + 1;
1364			$realline=$1-1;
1365			if (defined $2) {
1366				$realcnt=$3+1;
1367			} else {
1368				$realcnt=1+1;
1369			}
1370			annotate_reset();
1371			$prev_values = 'E';
1372
1373			%suppress_ifbraces = ();
1374			%suppress_whiletrailers = ();
1375			%suppress_export = ();
1376			next;
1377
1378# track the line number as we move through the hunk, note that
1379# new versions of GNU diff omit the leading space on completely
1380# blank context lines so we need to count that too.
1381		} elsif ($line =~ /^( |\+|$)/) {
1382			$realline++;
1383			$realcnt-- if ($realcnt != 0);
1384
1385			# Measure the line length and indent.
1386			($length, $indent) = line_stats($rawline);
1387
1388			# Track the previous line.
1389			($prevline, $stashline) = ($stashline, $line);
1390			($previndent, $stashindent) = ($stashindent, $indent);
1391			($prevrawline, $stashrawline) = ($stashrawline, $rawline);
1392
1393			#warn "line<$line>\n";
1394
1395		} elsif ($realcnt == 1) {
1396			$realcnt--;
1397		}
1398
1399		my $hunk_line = ($realcnt != 0);
1400
1401#make up the handle for any error we report on this line
1402		$prefix = "$filename:$realline: " if ($emacs && $file);
1403		$prefix = "$filename:$linenr: " if ($emacs && !$file);
1404		$prefix = "file=$filename,line=$realline:\:" if ($github && $file);
1405		$prefix = "file=$realfile,line=$realline:\:" if ($github && !$file);
1406
1407		$here = "#$linenr: " if (!$file);
1408		$here = "#$realline: " if ($file);
1409
1410		# extract the filename as it passes
1411		if ($line =~ /^diff --git.*?(\S+)$/) {
1412			$realfile = $1;
1413			$realfile =~ s@^([^/]*)/@@ if (!$file);
1414	                checkfilename($realfile, \$acpi_testexpected, \$acpi_nontestexpected);
1415		} elsif ($line =~ /^\+\+\+\s+(\S+)/) {
1416			$realfile = $1;
1417			$realfile =~ s@^([^/]*)/@@ if (!$file);
1418	                checkfilename($realfile, \$acpi_testexpected, \$acpi_nontestexpected);
1419
1420			$p1_prefix = $1;
1421			if (!$file && $tree && $p1_prefix ne '' && defined $root &&
1422			    -e "$root/$p1_prefix") {
1423				WARN("patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
1424			}
1425
1426			next;
1427		}
1428
1429		$here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
1430
1431		my $hereline = "$here\n$rawline\n";
1432		my $herecurr = "$here\n$rawline\n";
1433		my $hereprev = "$here\n$prevrawline\n$rawline\n";
1434
1435		$cnt_lines++ if ($realcnt != 0);
1436
1437# Check for incorrect file permissions
1438		if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
1439			my $permhere = $here . "FILE: $realfile\n";
1440			if ($realfile =~ /(\bMakefile(?:\.objs)?|\.c|\.cc|\.cpp|\.h|\.mak|\.[sS])$/) {
1441				ERROR("do not set execute permissions for source files\n" . $permhere);
1442			}
1443		}
1444
1445# Accept git diff extended headers as valid patches
1446		if ($line =~ /^(?:rename|copy) (?:from|to) [\w\/\.\-]+\s*$/) {
1447			$is_patch = 1;
1448		}
1449
1450# Filter out bad email addresses.
1451		if ($line =~ /^(Author|From): .*noreply.*/) {
1452		    ERROR("Real email adress is needed\n" . $herecurr);
1453		}
1454
1455#check the patch for a signoff:
1456		if ($line =~ /^\s*signed-off-by:/i) {
1457			# This is a signoff, if ugly, so do not double report.
1458			$in_commit_log = 0;
1459
1460			if (!($line =~ /^\s*Signed-off-by:/)) {
1461				ERROR("The correct form is \"Signed-off-by\"\n" .
1462					$herecurr);
1463			}
1464			if ($line =~ /^\s*signed-off-by:\S/i) {
1465				ERROR("space required after Signed-off-by:\n" .
1466					$herecurr);
1467			}
1468		}
1469
1470# Check for wrappage within a valid hunk of the file
1471		if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
1472			ERROR("patch seems to be corrupt (line wrapped?)\n" .
1473				$herecurr) if (!$emitted_corrupt++);
1474		}
1475
1476# UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
1477		if (($realfile =~ /^$/ || $line =~ /^\+/) &&
1478		    $rawline !~ m/^$UTF8*$/) {
1479			my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
1480
1481			my $blank = copy_spacing($rawline);
1482			my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
1483			my $hereptr = "$hereline$ptr\n";
1484
1485			ERROR("Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
1486		}
1487
1488		if ($rawline =~ m/$UTF8_MOJIBAKE/) {
1489			ERROR("Doubly-encoded UTF-8\n" . $herecurr);
1490		}
1491# Check if it's the start of a commit log
1492# (not a header line and we haven't seen the patch filename)
1493		if ($in_header_lines && $realfile =~ /^$/ &&
1494		    !($rawline =~ /^\s+\S/ ||
1495		      $rawline =~ /^(commit\b|from\b|[\w-]+:).*$/i)) {
1496			$in_header_lines = 0;
1497			$in_commit_log = 1;
1498		}
1499
1500# Check if there is UTF-8 in a commit log when a mail header has explicitly
1501# declined it, i.e defined some charset where it is missing.
1502		if ($in_header_lines &&
1503		    $rawline =~ /^Content-Type:.+charset="(.+)".*$/ &&
1504		    $1 !~ /utf-8/i) {
1505			$non_utf8_charset = 1;
1506		}
1507
1508		if ($in_commit_log && $non_utf8_charset && $realfile =~ /^$/ &&
1509		    $rawline =~ /$NON_ASCII_UTF8/) {
1510			WARN("8-bit UTF-8 used in possible commit log\n" . $herecurr);
1511		}
1512
1513# ignore non-hunk lines and lines being removed
1514		next if (!$hunk_line || $line =~ /^-/);
1515
1516#trailing whitespace
1517		if ($line =~ /^\+.*\015/) {
1518			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1519			ERROR("DOS line endings\n" . $herevet);
1520
1521		} elsif ($realfile =~ /^docs\/.+\.txt/ ||
1522			 $realfile =~ /^docs\/.+\.md/) {
1523		    if ($rawline =~ /^\+\s+$/ && $rawline !~ /^\+ {4}$/) {
1524			# TODO: properly check we're in a code block
1525			#       (surrounding text is 4-column aligned)
1526			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1527			ERROR("code blocks in documentation should have " .
1528			      "empty lines with exactly 4 columns of " .
1529			      "whitespace\n" . $herevet);
1530		    }
1531		} elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
1532			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1533			ERROR("trailing whitespace\n" . $herevet);
1534			$rpt_cleaners = 1;
1535		}
1536
1537# check we are in a valid source file if not then ignore this hunk
1538		next if ($realfile !~ /$SrcFile/);
1539
1540#120 column limit; exempt URLs, if no other words on line
1541		if ($line =~ /^\+/ &&
1542		    !($line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
1543		    !($rawline =~ /^[^[:alnum:]]*https?:\S*$/) &&
1544		    $length > 80 &&
1545		    $realfile !~ /\/tests\//)
1546		{
1547			if ($length > 120) {
1548				ERROR("line over 120 characters\n" . $herecurr);
1549			} else {
1550				WARN("line over 80 characters\n" . $herecurr);
1551			}
1552		}
1553
1554# check for spaces before a quoted newline
1555		if ($rawline =~ /^.*\".*\s\\n/) {
1556			ERROR("unnecessary whitespace before a quoted newline\n" . $herecurr);
1557		}
1558
1559# check for adding lines without a newline.
1560		if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
1561			ERROR("adding a line without newline at end of file\n" . $herecurr);
1562		}
1563
1564# check for RCS/CVS revision markers
1565		if ($rawline =~ /^\+.*\$(FreeBSD|Revision|Log|Id)(?:\$|\b)/) {
1566			ERROR("CVS style keyword markers, these will _not_ be updated\n". $herecurr);
1567		}
1568
1569# check we are in a valid C source file if not then ignore this hunk
1570		next if ($realfile !~ /\.(h|c|cpp)$/);
1571
1572# Block comment styles
1573
1574		# Block comments use /* on a line of its own
1575		if ($rawline !~ m@^\+.*/\*.*\*/[ \t)}]*$@ &&	#inline /*...*/
1576		    $rawline =~ m@^\+.*/\*[*-]?+[ \t]*[^ \t]@) { # /* or /** or /*- non-blank
1577			WARN("Block comments use a leading /* on a separate line\n" . $herecurr);
1578		}
1579
1580# Block comments use * on subsequent lines
1581		if ($prevline =~ /$;[ \t]*$/ &&			#ends in comment
1582		    $prevrawline =~ /^\+.*?\/\*/ &&		#starting /*
1583		    $prevrawline !~ /\*\/[ \t]*$/ &&		#no trailing */
1584		    $rawline =~ /^\+/ &&			#line is new
1585		    $rawline !~ /^\+[ \t]*\*/) {		#no leading *
1586			WARN("Block comments use * on subsequent lines\n" . $hereprev);
1587		}
1588
1589# Block comments use */ on trailing lines
1590		if ($rawline !~ m@^\+[ \t]*\*/[ \t]*$@ &&	#trailing */
1591		    $rawline !~ m@^\+.*/\*.*\*/[ \t]*$@ &&	#inline /*...*/
1592		    $rawline !~ m@^\+.*\*{2,}/[ \t]*$@ &&	#trailing **/
1593		    $rawline =~ m@^\+[ \t]*.+\*\/[ \t]*$@) {	#non blank */
1594			WARN("Block comments use a trailing */ on a separate line\n" . $herecurr);
1595		}
1596
1597# Block comment * alignment
1598		if ($prevline =~ /$;[ \t]*$/ &&			#ends in comment
1599		    $line =~ /^\+[ \t]*$;/ &&			#leading comment
1600		    $rawline =~ /^\+[ \t]*\*/ &&		#leading *
1601		    (($prevrawline =~ /^\+.*?\/\*/ &&		#leading /*
1602		      $prevrawline !~ /\*\/[ \t]*$/) ||		#no trailing */
1603		     $prevrawline =~ /^\+[ \t]*\*/)) {		#leading *
1604			my $oldindent;
1605			$prevrawline =~ m@^\+([ \t]*/?)\*@;
1606			if (defined($1)) {
1607				$oldindent = expand_tabs($1);
1608			} else {
1609				$prevrawline =~ m@^\+(.*/?)\*@;
1610				$oldindent = expand_tabs($1);
1611			}
1612			$rawline =~ m@^\+([ \t]*)\*@;
1613			my $newindent = $1;
1614			$newindent = expand_tabs($newindent);
1615			if (length($oldindent) ne length($newindent)) {
1616				WARN("Block comments should align the * on each line\n" . $hereprev);
1617			}
1618		}
1619
1620# Check for potential 'bare' types
1621		my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
1622		    $realline_next);
1623		if ($realcnt && $line =~ /.\s*\S/) {
1624			($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1625				ctx_statement_block($linenr, $realcnt, 0);
1626			$stat =~ s/\n./\n /g;
1627			$cond =~ s/\n./\n /g;
1628
1629			# Find the real next line.
1630			$realline_next = $line_nr_next;
1631			if (defined $realline_next &&
1632			    (!defined $lines[$realline_next - 1] ||
1633			     substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
1634				$realline_next++;
1635			}
1636
1637			my $s = $stat;
1638			$s =~ s/{.*$//s;
1639
1640			# Ignore goto labels.
1641			if ($s =~ /$Ident:\*$/s) {
1642
1643			# Ignore functions being called
1644			} elsif ($s =~ /^.\s*$Ident\s*\(/s) {
1645
1646			} elsif ($s =~ /^.\s*else\b/s) {
1647
1648			# declarations always start with types
1649			} elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
1650				my $type = $1;
1651				$type =~ s/\s+/ /g;
1652				possible($type, "A:" . $s);
1653
1654			# definitions in global scope can only start with types
1655			} elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
1656				possible($1, "B:" . $s);
1657			}
1658
1659			# any (foo ... *) is a pointer cast, and foo is a type
1660			while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
1661				possible($1, "C:" . $s);
1662			}
1663
1664			# Check for any sort of function declaration.
1665			# int foo(something bar, other baz);
1666			# void (*store_gdt)(x86_descr_ptr *);
1667			if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
1668				my ($name_len) = length($1);
1669
1670				my $ctx = $s;
1671				substr($ctx, 0, $name_len + 1, '');
1672				$ctx =~ s/\)[^\)]*$//;
1673
1674				for my $arg (split(/\s*,\s*/, $ctx)) {
1675					if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
1676
1677						possible($1, "D:" . $s);
1678					}
1679				}
1680			}
1681
1682		}
1683
1684#
1685# Checks which may be anchored in the context.
1686#
1687
1688# Check for switch () and associated case and default
1689# statements should be at the same indent.
1690		if ($line=~/\bswitch\s*\(.*\)/) {
1691			my $err = '';
1692			my $sep = '';
1693			my @ctx = ctx_block_outer($linenr, $realcnt);
1694			shift(@ctx);
1695			for my $ctx (@ctx) {
1696				my ($clen, $cindent) = line_stats($ctx);
1697				if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
1698							$indent != $cindent) {
1699					$err .= "$sep$ctx\n";
1700					$sep = '';
1701				} else {
1702					$sep = "[...]\n";
1703				}
1704			}
1705			if ($err ne '') {
1706				ERROR("switch and case should be at the same indent\n$hereline$err");
1707			}
1708		}
1709
1710# if/while/etc brace do not go on next line, unless defining a do while loop,
1711# or if that brace on the next line is for something else
1712		if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
1713			my $pre_ctx = "$1$2";
1714
1715			my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
1716			my $ctx_cnt = $realcnt - $#ctx - 1;
1717			my $ctx = join("\n", @ctx);
1718
1719			my $ctx_ln = $linenr;
1720			my $ctx_skip = $realcnt;
1721
1722			while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
1723					defined $lines[$ctx_ln - 1] &&
1724					$lines[$ctx_ln - 1] =~ /^-/)) {
1725				##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
1726				$ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
1727				$ctx_ln++;
1728			}
1729
1730			#print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
1731			#print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
1732
1733			# The length of the "previous line" is checked against 80 because it
1734			# includes the + at the beginning of the line (if the actual line has
1735			# 79 or 80 characters, it is no longer possible to add a space and an
1736			# opening brace there)
1737			if ($#ctx == 0 && $ctx !~ /{\s*/ &&
1738			    defined($lines[$ctx_ln - 1]) && $lines[$ctx_ln - 1] =~ /^\+\s*\{/ &&
1739			    defined($lines[$ctx_ln - 2]) && length($lines[$ctx_ln - 2]) < 80) {
1740				ERROR("that open brace { should be on the previous line\n" .
1741					"$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1742			}
1743			if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
1744			    $ctx =~ /\)\s*\;\s*$/ &&
1745			    defined $lines[$ctx_ln - 1])
1746			{
1747				my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
1748				if ($nindent > $indent) {
1749					ERROR("trailing semicolon indicates no statements, indent implies otherwise\n" .
1750						"$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1751				}
1752			}
1753		}
1754
1755# 'do ... while (0/false)' only makes sense in macros, without trailing ';'
1756		if ($line =~ /while\s*\((0|false)\);/) {
1757			ERROR("suspicious ; after while (0)\n" . $herecurr);
1758		}
1759
1760# Check superfluous trailing ';'
1761		if ($line =~ /;;$/) {
1762			ERROR("superfluous trailing semicolon\n" . $herecurr);
1763		}
1764
1765# Check relative indent for conditionals and blocks.
1766		if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
1767			my ($s, $c) = ($stat, $cond);
1768
1769			substr($s, 0, length($c), '');
1770
1771			# Make sure we remove the line prefixes as we have
1772			# none on the first line, and are going to re-add them
1773			# where necessary.
1774			$s =~ s/\n./\n/gs;
1775
1776			# Find out how long the conditional actually is.
1777			my @newlines = ($c =~ /\n/gs);
1778			my $cond_lines = 1 + $#newlines;
1779
1780			# We want to check the first line inside the block
1781			# starting at the end of the conditional, so remove:
1782			#  1) any blank line termination
1783			#  2) any opening brace { on end of the line
1784			#  3) any do (...) {
1785			my $continuation = 0;
1786			my $check = 0;
1787			$s =~ s/^.*\bdo\b//;
1788			$s =~ s/^\s*\{//;
1789			if ($s =~ s/^\s*\\//) {
1790				$continuation = 1;
1791			}
1792			if ($s =~ s/^\s*?\n//) {
1793				$check = 1;
1794				$cond_lines++;
1795			}
1796
1797			# Also ignore a loop construct at the end of a
1798			# preprocessor statement.
1799			if (($prevline =~ /^.\s*#\s*define\s/ ||
1800			    $prevline =~ /\\\s*$/) && $continuation == 0) {
1801				$check = 0;
1802			}
1803
1804			my $cond_ptr = -1;
1805			$continuation = 0;
1806			while ($cond_ptr != $cond_lines) {
1807				$cond_ptr = $cond_lines;
1808
1809				# If we see an #else/#elif then the code
1810				# is not linear.
1811				if ($s =~ /^\s*\#\s*(?:else|elif)/) {
1812					$check = 0;
1813				}
1814
1815				# Ignore:
1816				#  1) blank lines, they should be at 0,
1817				#  2) preprocessor lines, and
1818				#  3) labels.
1819				if ($continuation ||
1820				    $s =~ /^\s*?\n/ ||
1821				    $s =~ /^\s*#\s*?/ ||
1822				    $s =~ /^\s*$Ident\s*:/) {
1823					$continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
1824					if ($s =~ s/^.*?\n//) {
1825						$cond_lines++;
1826					}
1827				}
1828			}
1829
1830			my (undef, $sindent) = line_stats("+" . $s);
1831			my $stat_real = raw_line($linenr, $cond_lines);
1832
1833			# Check if either of these lines are modified, else
1834			# this is not this patch's fault.
1835			if (!defined($stat_real) ||
1836			    $stat !~ /^\+/ && $stat_real !~ /^\+/) {
1837				$check = 0;
1838			}
1839			if (defined($stat_real) && $cond_lines > 1) {
1840				$stat_real = "[...]\n$stat_real";
1841			}
1842
1843			#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";
1844
1845			if ($check && (($sindent % 4) != 0 ||
1846			    ($sindent <= $indent && $s ne ''))) {
1847				ERROR("suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
1848			}
1849		}
1850
1851		# Track the 'values' across context and added lines.
1852		my $opline = $line; $opline =~ s/^./ /;
1853		my ($curr_values, $curr_vars) =
1854				annotate_values($opline . "\n", $prev_values);
1855		$curr_values = $prev_values . $curr_values;
1856		if ($dbg_values) {
1857			my $outline = $opline; $outline =~ s/\t/ /g;
1858			print "$linenr > .$outline\n";
1859			print "$linenr > $curr_values\n";
1860			print "$linenr >  $curr_vars\n";
1861		}
1862		$prev_values = substr($curr_values, -1);
1863
1864#ignore lines not being added
1865		if ($line=~/^[^\+]/) {next;}
1866
1867# check for initialisation to aggregates open brace on the next line
1868		if ($line =~ /^.\s*\{/ &&
1869		    $prevline =~ /(?:^|[^=])=\s*$/) {
1870			ERROR("that open brace { should be on the previous line\n" . $hereprev);
1871		}
1872
1873#
1874# Checks which are anchored on the added line.
1875#
1876
1877# check for malformed paths in #include statements (uses RAW line)
1878		if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
1879			my $path = $1;
1880			if ($path =~ m{//}) {
1881				ERROR("malformed #include filename\n" .
1882					$herecurr);
1883			}
1884		}
1885
1886# Remove C99 comments.
1887		$line =~ s@//.*@@;
1888		$opline =~ s@//.*@@;
1889
1890# * goes on variable not on type
1891		# (char*[ const])
1892		if ($line =~ m{\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\)}) {
1893			my ($from, $to) = ($1, $1);
1894
1895			# Should start with a space.
1896			$to =~ s/^(\S)/ $1/;
1897			# Should not end with a space.
1898			$to =~ s/\s+$//;
1899			# '*'s should not have spaces between.
1900			while ($to =~ s/\*\s+\*/\*\*/) {
1901			}
1902
1903			#print "from<$from> to<$to>\n";
1904			if ($from ne $to) {
1905				ERROR("\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr);
1906			}
1907		} elsif ($line =~ m{\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident)}) {
1908			my ($from, $to, $ident) = ($1, $1, $2);
1909
1910			# Should start with a space.
1911			$to =~ s/^(\S)/ $1/;
1912			# Should not end with a space.
1913			$to =~ s/\s+$//;
1914			# '*'s should not have spaces between.
1915			while ($to =~ s/\*\s+\*/\*\*/) {
1916			}
1917			# Modifiers should have spaces.
1918			$to =~ s/(\b$Modifier$)/$1 /;
1919
1920			#print "from<$from> to<$to> ident<$ident>\n";
1921			if ($from ne $to && $ident !~ /^$Modifier$/) {
1922				ERROR("\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr);
1923			}
1924		}
1925
1926# function brace can't be on same line, except for #defines of do while,
1927# or if closed on same line
1928		if (($line=~/$Type\s*$Ident\(.*\).*\s\{/) and
1929		    !($line=~/\#\s*define.*do\s\{/) and !($line=~/}/)) {
1930			ERROR("open brace '{' following function declarations go on the next line\n" . $herecurr);
1931		}
1932
1933# missing space after union, struct or enum definition
1934		if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?(?:\s+$Ident)?[=\{]/) {
1935		    ERROR("missing space after $1 definition\n" . $herecurr);
1936		}
1937
1938# check for spacing round square brackets; allowed:
1939#  1. with a type on the left -- int [] a;
1940#  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
1941#  3. inside a curly brace -- = { [0...10] = 5 }
1942#  4. after a comma -- [1] = 5, [2] = 6
1943#  5. in a macro definition -- #define abc(x) [x] = y
1944		while ($line =~ /(.*?\s)\[/g) {
1945			my ($where, $prefix) = ($-[1], $1);
1946			if ($prefix !~ /$Type\s+$/ &&
1947			    ($where != 0 || $prefix !~ /^.\s+$/) &&
1948			    $prefix !~ /\#\s*define[^(]*\([^)]*\)\s+$/ &&
1949			    $prefix !~ /[,{:]\s+$/) {
1950				ERROR("space prohibited before open square bracket '['\n" . $herecurr);
1951			}
1952		}
1953
1954# check for spaces between functions and their parentheses.
1955		while ($line =~ /($Ident)\s+\(/g) {
1956			my $name = $1;
1957			my $ctx_before = substr($line, 0, $-[1]);
1958			my $ctx = "$ctx_before$name";
1959
1960			# Ignore those directives where spaces _are_ permitted.
1961			if ($name =~ /^(?:
1962				if|for|while|switch|return|case|
1963				volatile|__volatile__|coroutine_fn|
1964				__attribute__|format|__extension__|
1965				asm|__asm__)$/x)
1966			{
1967
1968			# Ignore 'catch (...)' in C++
1969			} elsif ($name =~ /^catch$/ && $realfile =~ /(\.cpp|\.h)$/) {
1970
1971			# cpp #define statements have non-optional spaces, ie
1972			# if there is a space between the name and the open
1973			# parenthesis it is simply not a parameter group.
1974			} elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
1975
1976			# cpp #elif statement condition may start with a (
1977			} elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
1978
1979			# If this whole things ends with a type its most
1980			# likely a typedef for a function.
1981			} elsif ($ctx =~ /$Type$/) {
1982
1983			} else {
1984				ERROR("space prohibited between function name and open parenthesis '('\n" . $herecurr);
1985			}
1986		}
1987# Check operator spacing.
1988		if (!($line=~/\#\s*include/)) {
1989			my $ops = qr{
1990				<<=|>>=|<=|>=|==|!=|
1991				\+=|-=|\*=|\/=|%=|\^=|\|=|&=|
1992				=>|->|<<|>>|<|>|=|!|~|
1993				&&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
1994				\?|::|:
1995			}x;
1996			my @elements = split(/($ops|;)/, $opline);
1997			my $off = 0;
1998
1999			my $blank = copy_spacing($opline);
2000
2001			for (my $n = 0; $n < $#elements; $n += 2) {
2002				$off += length($elements[$n]);
2003
2004				# Pick up the preceding and succeeding characters.
2005				my $ca = substr($opline, 0, $off);
2006				my $cc = '';
2007				if (length($opline) >= ($off + length($elements[$n + 1]))) {
2008					$cc = substr($opline, $off + length($elements[$n + 1]));
2009				}
2010				my $cb = "$ca$;$cc";
2011
2012				my $a = '';
2013				$a = 'V' if ($elements[$n] ne '');
2014				$a = 'W' if ($elements[$n] =~ /\s$/);
2015				$a = 'C' if ($elements[$n] =~ /$;$/);
2016				$a = 'B' if ($elements[$n] =~ /(\[|\()$/);
2017				$a = 'O' if ($elements[$n] eq '');
2018				$a = 'E' if ($ca =~ /^\s*$/);
2019
2020				my $op = $elements[$n + 1];
2021
2022				my $c = '';
2023				if (defined $elements[$n + 2]) {
2024					$c = 'V' if ($elements[$n + 2] ne '');
2025					$c = 'W' if ($elements[$n + 2] =~ /^\s/);
2026					$c = 'C' if ($elements[$n + 2] =~ /^$;/);
2027					$c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
2028					$c = 'O' if ($elements[$n + 2] eq '');
2029					$c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
2030				} else {
2031					$c = 'E';
2032				}
2033
2034				my $ctx = "${a}x${c}";
2035
2036				my $at = "(ctx:$ctx)";
2037
2038				my $ptr = substr($blank, 0, $off) . "^";
2039				my $hereptr = "$hereline$ptr\n";
2040
2041				# Pull out the value of this operator.
2042				my $op_type = substr($curr_values, $off + 1, 1);
2043
2044				# Get the full operator variant.
2045				my $opv = $op . substr($curr_vars, $off, 1);
2046
2047				# Ignore operators passed as parameters.
2048				if ($op_type ne 'V' &&
2049				    $ca =~ /\s$/ && $cc =~ /^\s*,/) {
2050
2051#				# Ignore comments
2052#				} elsif ($op =~ /^$;+$/) {
2053
2054				# ; should have either the end of line or a space or \ after it
2055				} elsif ($op eq ';') {
2056					if ($ctx !~ /.x[WEBC]/ &&
2057					    $cc !~ /^\\/ && $cc !~ /^;/) {
2058						ERROR("space required after that '$op' $at\n" . $hereptr);
2059					}
2060
2061				# // is a comment
2062				} elsif ($op eq '//') {
2063
2064				# Ignore : used in class declaration in C++
2065				} elsif ($opv eq ':B' && $ctx =~ /Wx[WE]/ &&
2066						 $line =~ /class/ && $realfile =~ /(\.cpp|\.h)$/) {
2067
2068				# No spaces for:
2069				#   ->
2070				#   :   when part of a bitfield
2071				} elsif ($op eq '->' || $opv eq ':B') {
2072					if ($ctx =~ /Wx.|.xW/) {
2073						ERROR("spaces prohibited around that '$op' $at\n" . $hereptr);
2074					}
2075
2076				# , must have a space on the right.
2077                                # not required when having a single },{ on one line
2078				} elsif ($op eq ',') {
2079					if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/ &&
2080                                            ($elements[$n] . $elements[$n + 2]) !~ " *}\\{") {
2081						ERROR("space required after that '$op' $at\n" . $hereptr);
2082					}
2083
2084				# '*' as part of a type definition -- reported already.
2085				} elsif ($opv eq '*_') {
2086					#warn "'*' is part of type\n";
2087
2088				# unary operators should have a space before and
2089				# none after.  May be left adjacent to another
2090				# unary operator, or a cast
2091				} elsif ($op eq '!' || $op eq '~' ||
2092					 $opv eq '*U' || $opv eq '-U' ||
2093					 $opv eq '&U' || $opv eq '&&U') {
2094					if ($op eq '~' && $ca =~ /::$/ && $realfile =~ /(\.cpp|\.h)$/) {
2095						# '~' used as a name of Destructor
2096
2097					} elsif ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
2098						ERROR("space required before that '$op' $at\n" . $hereptr);
2099					}
2100					if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
2101						# A unary '*' may be const
2102
2103					} elsif ($ctx =~ /.xW/) {
2104						ERROR("space prohibited after that '$op' $at\n" . $hereptr);
2105					}
2106
2107				# unary ++ and unary -- are allowed no space on one side.
2108				} elsif ($op eq '++' or $op eq '--') {
2109					if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
2110						ERROR("space required one side of that '$op' $at\n" . $hereptr);
2111					}
2112					if ($ctx =~ /Wx[BE]/ ||
2113					    ($ctx =~ /Wx./ && $cc =~ /^;/)) {
2114						ERROR("space prohibited before that '$op' $at\n" . $hereptr);
2115					}
2116					if ($ctx =~ /ExW/) {
2117						ERROR("space prohibited after that '$op' $at\n" . $hereptr);
2118					}
2119
2120				# A colon needs no spaces before when it is
2121				# terminating a case value or a label.
2122				} elsif ($opv eq ':C' || $opv eq ':L') {
2123					if ($ctx =~ /Wx./) {
2124						ERROR("space prohibited before that '$op' $at\n" . $hereptr);
2125					}
2126
2127				# All the others need spaces both sides.
2128				} elsif ($ctx !~ /[EWC]x[CWE]/) {
2129					my $ok = 0;
2130
2131					if ($realfile =~ /\.cpp|\.h$/) {
2132						# Ignore template arguments <...> in C++
2133						if (($op eq '<' || $op eq '>') && $line =~ /<.*>/) {
2134							$ok = 1;
2135						}
2136
2137						# Ignore :: in C++
2138						if ($op eq '::') {
2139							$ok = 1;
2140						}
2141					}
2142
2143					# Ignore email addresses <foo@bar>
2144					if (($op eq '<' &&
2145					     $cc =~ /^\S+\@\S+>/) ||
2146					    ($op eq '>' &&
2147					     $ca =~ /<\S+\@\S+$/))
2148					{
2149						$ok = 1;
2150					}
2151
2152					# Ignore ?:
2153					if (($opv eq ':O' && $ca =~ /\?$/) ||
2154					    ($op eq '?' && $cc =~ /^:/)) {
2155						$ok = 1;
2156					}
2157
2158					if ($ok == 0) {
2159						ERROR("spaces required around that '$op' $at\n" . $hereptr);
2160					}
2161				}
2162				$off += length($elements[$n + 1]);
2163			}
2164		}
2165
2166#need space before brace following if, while, etc
2167		if (($line =~ /\(.*\)\{/ && $line !~ /\($Type\)\{/) ||
2168		    $line =~ /do\{/) {
2169			ERROR("space required before the open brace '{'\n" . $herecurr);
2170		}
2171
2172# closing brace should have a space following it when it has anything
2173# on the line
2174		if ($line =~ /}(?!(?:,|;|\)))\S/) {
2175			ERROR("space required after that close brace '}'\n" . $herecurr);
2176		}
2177
2178# check spacing on square brackets
2179		if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
2180			ERROR("space prohibited after that open square bracket '['\n" . $herecurr);
2181		}
2182		if ($line =~ /\s\]/) {
2183			ERROR("space prohibited before that close square bracket ']'\n" . $herecurr);
2184		}
2185
2186# check spacing on parentheses
2187		if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
2188		    $line !~ /for\s*\(\s+;/) {
2189			ERROR("space prohibited after that open parenthesis '('\n" . $herecurr);
2190		}
2191		if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
2192		    $line !~ /for\s*\(.*;\s+\)/ &&
2193		    $line !~ /:\s+\)/) {
2194			ERROR("space prohibited before that close parenthesis ')'\n" . $herecurr);
2195		}
2196
2197		if ($line =~ /^.\s*(Q(?:S?LIST|SIMPLEQ|TAILQ)_HEAD)\s*\(\s*[^,]/ &&
2198		    $line !~ /^.typedef/) {
2199		    ERROR("named $1 should be typedefed separately\n" . $herecurr);
2200		}
2201
2202# Return needs parens
2203		if ($line =~ /^.\s*return [^(]/) {
2204		    ERROR("parentheses required on return\n" . $herecurr);
2205		}
2206
2207# Need a space before open parenthesis after if, while etc
2208		if ($line=~/\b(if|while|for|switch|return)\(/) {
2209			ERROR("space required before the open parenthesis '('\n" . $herecurr);
2210		}
2211
2212# Check for illegal assignment in if conditional -- and check for trailing
2213# statements after the conditional.
2214		if ($line =~ /do\s*(?!{)/) {
2215			my ($stat_next) = ctx_statement_block($line_nr_next,
2216						$remain_next, $off_next);
2217			$stat_next =~ s/\n./\n /g;
2218			##print "stat<$stat> stat_next<$stat_next>\n";
2219
2220			if ($stat_next =~ /^\s*while\b/) {
2221				# If the statement carries leading newlines,
2222				# then count those as offsets.
2223				my ($whitespace) =
2224					($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
2225				my $offset =
2226					statement_rawlines($whitespace) - 1;
2227
2228				$suppress_whiletrailers{$line_nr_next +
2229								$offset} = 1;
2230			}
2231		}
2232		if (!defined $suppress_whiletrailers{$linenr} &&
2233		    $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
2234			my ($s, $c) = ($stat, $cond);
2235
2236#			if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
2237#				ERROR("do not use assignment in if condition\n" . $herecurr);
2238#			}
2239
2240			# Find out what is on the end of the line after the
2241			# conditional.
2242			substr($s, 0, length($c), '');
2243			$s =~ s/\n.*//g;
2244			$s =~ s/$;//g; 	# Remove any comments
2245			if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
2246			    $c !~ /}\s*while\s*/)
2247			{
2248				# Find out how long the conditional actually is.
2249				my @newlines = ($c =~ /\n/gs);
2250				my $cond_lines = 1 + $#newlines;
2251				my $stat_real = '';
2252
2253				$stat_real = raw_line($linenr, $cond_lines)
2254							. "\n" if ($cond_lines);
2255				if (defined($stat_real) && $cond_lines > 1) {
2256					$stat_real = "[...]\n$stat_real";
2257				}
2258
2259				ERROR("trailing statements should be on next line\n" . $herecurr . $stat_real);
2260			}
2261		}
2262
2263# Check for bitwise tests written as boolean
2264		if ($line =~ /
2265			(?:
2266				(?:\[|\(|\&\&|\|\|)
2267				\s*0[xX][0-9]+\s*
2268				(?:\&\&|\|\|)
2269			|
2270				(?:\&\&|\|\|)
2271				\s*0[xX][0-9]+\s*
2272				(?:\&\&|\|\||\)|\])
2273			)/x)
2274		{
2275			ERROR("boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
2276		}
2277
2278# if and else should not have general statements after it
2279		if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
2280			my $s = $1;
2281			$s =~ s/$;//g; 	# Remove any comments
2282			if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
2283				ERROR("trailing statements should be on next line\n" . $herecurr);
2284			}
2285		}
2286# if should not continue a brace
2287		if ($line =~ /}\s*if\b/) {
2288			ERROR("trailing statements should be on next line\n" .
2289				$herecurr);
2290		}
2291# case and default should not have general statements after them
2292		if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
2293		    $line !~ /\G(?:
2294			(?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
2295			\s*return\s+
2296		    )/xg)
2297		{
2298			ERROR("trailing statements should be on next line\n" . $herecurr);
2299		}
2300
2301		# Check for }<nl>else {, these must be at the same
2302		# indent level to be relevant to each other.
2303		if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
2304						$previndent == $indent) {
2305			ERROR("else should follow close brace '}'\n" . $hereprev);
2306		}
2307
2308		if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and
2309						$previndent == $indent) {
2310			my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
2311
2312			# Find out what is on the end of the line after the
2313			# conditional.
2314			substr($s, 0, length($c), '');
2315			$s =~ s/\n.*//g;
2316
2317			if ($s =~ /^\s*;/) {
2318				ERROR("while should follow close brace '}'\n" . $hereprev);
2319			}
2320		}
2321
2322#no spaces allowed after \ in define
2323		if ($line=~/\#\s*define.*\\\s$/) {
2324			ERROR("Whitespace after \\ makes next lines useless\n" . $herecurr);
2325		}
2326
2327# multi-statement macros should be enclosed in a do while loop, grab the
2328# first statement and ensure its the whole macro if its not enclosed
2329# in a known good container
2330		if ($realfile !~ m@/vmlinux.lds.h$@ &&
2331		    $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
2332			my $ln = $linenr;
2333			my $cnt = $realcnt;
2334			my ($off, $dstat, $dcond, $rest);
2335			my $ctx = '';
2336
2337			my $args = defined($1);
2338
2339			# Find the end of the macro and limit our statement
2340			# search to that.
2341			while ($cnt > 0 && defined $lines[$ln - 1] &&
2342				$lines[$ln - 1] =~ /^(?:-|..*\\$)/)
2343			{
2344				$ctx .= $rawlines[$ln - 1] . "\n";
2345				$cnt-- if ($lines[$ln - 1] !~ /^-/);
2346				$ln++;
2347			}
2348			$ctx .= $rawlines[$ln - 1];
2349
2350			($dstat, $dcond, $ln, $cnt, $off) =
2351				ctx_statement_block($linenr, $ln - $linenr + 1, 0);
2352			#print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
2353			#print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
2354
2355			# Extract the remainder of the define (if any) and
2356			# rip off surrounding spaces, and trailing \'s.
2357			$rest = '';
2358			while ($off != 0 || ($cnt > 0 && $rest =~ /\\\s*$/)) {
2359				#print "ADDING cnt<$cnt> $off <" . substr($lines[$ln - 1], $off) . "> rest<$rest>\n";
2360				if ($off != 0 || $lines[$ln - 1] !~ /^-/) {
2361					$rest .= substr($lines[$ln - 1], $off) . "\n";
2362					$cnt--;
2363				}
2364				$ln++;
2365				$off = 0;
2366			}
2367			$rest =~ s/\\\n.//g;
2368			$rest =~ s/^\s*//s;
2369			$rest =~ s/\s*$//s;
2370
2371			# Clean up the original statement.
2372			if ($args) {
2373				substr($dstat, 0, length($dcond), '');
2374			} else {
2375				$dstat =~ s/^.\s*\#\s*define\s+$Ident\s*//;
2376			}
2377			$dstat =~ s/$;//g;
2378			$dstat =~ s/\\\n.//g;
2379			$dstat =~ s/^\s*//s;
2380			$dstat =~ s/\s*$//s;
2381
2382			# Flatten any parentheses and braces
2383			while ($dstat =~ s/\([^\(\)]*\)/1/ ||
2384			       $dstat =~ s/\{[^\{\}]*\}/1/ ||
2385			       $dstat =~ s/\[[^\{\}]*\]/1/)
2386			{
2387			}
2388
2389			my $exceptions = qr{
2390				$Declare|
2391				module_param_named|
2392				MODULE_PARAM_DESC|
2393				DECLARE_PER_CPU|
2394				DEFINE_PER_CPU|
2395				__typeof__\(|
2396				union|
2397				struct|
2398				\.$Ident\s*=\s*|
2399				^\"|\"$
2400			}x;
2401			#print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
2402			if ($rest ne '' && $rest ne ',') {
2403				if ($rest !~ /while\s*\(/ &&
2404				    $dstat !~ /$exceptions/)
2405				{
2406					ERROR("Macros with multiple statements should be enclosed in a do - while loop\n" . "$here\n$ctx\n");
2407				}
2408
2409			} elsif ($ctx !~ /;/) {
2410				if ($dstat ne '' &&
2411				    $dstat !~ /^(?:$Ident|-?$Constant)$/ &&
2412				    $dstat !~ /$exceptions/ &&
2413				    $dstat !~ /^\.$Ident\s*=/ &&
2414				    $dstat =~ /$Operators/)
2415				{
2416					ERROR("Macros with complex values should be enclosed in parenthesis\n" . "$here\n$ctx\n");
2417				}
2418			}
2419		}
2420
2421# check for missing bracing around if etc
2422		if ($line =~ /(^.*)\b(?:if|while|for)\b/ &&
2423			$line !~ /\#\s*if/) {
2424			my $allowed = 0;
2425
2426			# Check the pre-context.
2427			if ($line =~ /(\}.*?)$/) {
2428				my $pre = $1;
2429
2430				if ($line !~ /else/) {
2431					print "APW: ALLOWED: pre<$pre> line<$line>\n"
2432						if $dbg_adv_apw;
2433					$allowed = 1;
2434				}
2435			}
2436			my ($level, $endln, @chunks) =
2437				ctx_statement_full($linenr, $realcnt, 1);
2438                        if ($dbg_adv_apw) {
2439                            print "APW: chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
2440                            print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n"
2441                                if $#chunks >= 1;
2442                        }
2443			if ($#chunks >= 0 && $level == 0) {
2444				my $seen = 0;
2445				my $herectx = $here . "\n";
2446				my $ln = $linenr - 1;
2447				for my $chunk (@chunks) {
2448					my ($cond, $block) = @{$chunk};
2449
2450					# If the condition carries leading newlines, then count those as offsets.
2451					my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
2452					my $offset = statement_rawlines($whitespace) - 1;
2453
2454					#print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
2455
2456					# We have looked at and allowed this specific line.
2457					$suppress_ifbraces{$ln + $offset} = 1;
2458
2459					$herectx .= "$rawlines[$ln + $offset]\n[...]\n";
2460					$ln += statement_rawlines($block) - 1;
2461
2462					substr($block, 0, length($cond), '');
2463
2464					my $spaced_block = $block;
2465					$spaced_block =~ s/\n\+/ /g;
2466
2467					$seen++ if ($spaced_block =~ /^\s*\{/);
2468
2469                                        print "APW: cond<$cond> block<$block> allowed<$allowed>\n"
2470                                            if $dbg_adv_apw;
2471					if (statement_lines($cond) > 1) {
2472                                            print "APW: ALLOWED: cond<$cond>\n"
2473                                                if $dbg_adv_apw;
2474                                            $allowed = 1;
2475					}
2476					if ($block =~/\b(?:if|for|while)\b/) {
2477                                            print "APW: ALLOWED: block<$block>\n"
2478                                                if $dbg_adv_apw;
2479                                            $allowed = 1;
2480					}
2481					if (statement_block_size($block) > 1) {
2482                                            print "APW: ALLOWED: lines block<$block>\n"
2483                                                if $dbg_adv_apw;
2484                                            $allowed = 1;
2485					}
2486				}
2487				$allowed=1; # disable for now.
2488				if ($seen != ($#chunks + 1) && !$allowed) {
2489					ERROR("braces {} are necessary for all arms of this statement\n" . $herectx);
2490				}
2491			}
2492		}
2493		if (!defined $suppress_ifbraces{$linenr - 1} &&
2494					$line =~ /\b(if|while|for|else)\b/ &&
2495					$line !~ /\#\s*if/ &&
2496					$line !~ /\#\s*else/) {
2497			my $allowed = 0;
2498
2499                        # Check the pre-context.
2500                        if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
2501                            my $pre = $1;
2502
2503                            if ($line !~ /else/) {
2504                                print "APW: ALLOWED: pre<$pre> line<$line>\n"
2505                                    if $dbg_adv_apw;
2506                                $allowed = 1;
2507                            }
2508                        }
2509
2510			my ($level, $endln, @chunks) =
2511				ctx_statement_full($linenr, $realcnt, $-[0]);
2512
2513			# Check the condition.
2514			my ($cond, $block) = @{$chunks[0]};
2515                        print "CHECKING<$linenr> cond<$cond> block<$block>\n"
2516                            if $dbg_adv_checking;
2517			if (defined $cond) {
2518				substr($block, 0, length($cond), '');
2519			}
2520			if (statement_lines($cond) > 1) {
2521                            print "APW: ALLOWED: cond<$cond>\n"
2522                                if $dbg_adv_apw;
2523                            $allowed = 1;
2524			}
2525			if ($block =~/\b(?:if|for|while)\b/) {
2526                            print "APW: ALLOWED: block<$block>\n"
2527                                if $dbg_adv_apw;
2528                            $allowed = 1;
2529			}
2530			if (statement_block_size($block) > 1) {
2531                            print "APW: ALLOWED: lines block<$block>\n"
2532                                if $dbg_adv_apw;
2533                            $allowed = 1;
2534			}
2535			# Check the post-context.
2536			if (defined $chunks[1]) {
2537				my ($cond, $block) = @{$chunks[1]};
2538				if (defined $cond) {
2539					substr($block, 0, length($cond), '');
2540				}
2541				if ($block =~ /^\s*\{/) {
2542                                    print "APW: ALLOWED: chunk-1 block<$block>\n"
2543                                        if $dbg_adv_apw;
2544                                    $allowed = 1;
2545				}
2546			}
2547                        print "DCS: level=$level block<$block> allowed=$allowed\n"
2548                            if $dbg_adv_dcs;
2549			if ($level == 0 && $block !~ /^\s*\{/ && !$allowed) {
2550				my $herectx = $here . "\n";;
2551				my $cnt = statement_rawlines($block);
2552
2553				for (my $n = 0; $n < $cnt; $n++) {
2554					$herectx .= raw_line($linenr, $n) . "\n";;
2555				}
2556
2557				WARN("braces {} are encouraged even for single statement blocks\n" . $herectx);
2558			}
2559		}
2560
2561# warn about #if 0
2562		if ($line =~ /^.\s*\#\s*if\s+0\b/) {
2563			ERROR("if this code is redundant consider removing it\n" .
2564				$herecurr);
2565		}
2566
2567# Check that the storage class is at the beginning of a declaration
2568		if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
2569			ERROR("storage class should be at the beginning of the declaration\n" . $herecurr)
2570		}
2571
2572# check the location of the inline attribute, that it is between
2573# storage class and type.
2574		if ($line =~ /\b$Type\s+$Inline\b/ ||
2575		    $line =~ /\b$Inline\s+$Storage\b/) {
2576			ERROR("inline keyword should sit between storage class and type\n" . $herecurr);
2577		}
2578
2579# check for sizeof(&)
2580		if ($line =~ /\bsizeof\s*\(\s*\&/) {
2581			ERROR("sizeof(& should be avoided\n" . $herecurr);
2582		}
2583
2584# check for new externs in .c files.
2585		if ($realfile =~ /\.c$/ && defined $stat &&
2586		    $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
2587		{
2588			my $function_name = $1;
2589			my $paren_space = $2;
2590
2591			my $s = $stat;
2592			if (defined $cond) {
2593				substr($s, 0, length($cond), '');
2594			}
2595			if ($s =~ /^\s*;/ &&
2596			    $function_name ne 'uninitialized_var')
2597			{
2598				ERROR("externs should be avoided in .c files\n" .  $herecurr);
2599			}
2600
2601			if ($paren_space =~ /\n/) {
2602				ERROR("arguments for function declarations should follow identifier\n" . $herecurr);
2603			}
2604
2605		} elsif ($realfile =~ /\.c$/ && defined $stat &&
2606		    $stat =~ /^.\s*extern\s+/)
2607		{
2608			ERROR("externs should be avoided in .c files\n" .  $herecurr);
2609		}
2610
2611# check for gcc specific __FUNCTION__
2612		if ($line =~ /__FUNCTION__/) {
2613			ERROR("__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr);
2614		}
2615
2616# recommend sigaction over signal for portability, when establishing a handler
2617		if ($line =~ /\bsignal\s*\(/ && !($line =~ /SIG_(?:IGN|DFL)/)) {
2618			ERROR("use sigaction to establish signal handlers; signal is not portable\n" . $herecurr);
2619		}
2620
2621# format strings checks
2622		my $string;
2623		while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
2624			$string = substr($rawline, $-[1], $+[1] - $-[1]);
2625			$string =~ s/%%/__/g;
2626			# check for %L{u,d,i} in strings
2627			if ($string =~ /(?<!%)%L[udi]/) {
2628				ERROR("\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
2629			}
2630		}
2631
2632	# Continue checking for error messages that contains newlines. This
2633	# check handles cases where string literals are spread over multiple lines.
2634	# Example:
2635	# error_report("Error msg line #1"
2636	#              "Error msg line #2\n");
2637	my $quoted_newline_regex = qr{\+\s*\".*\\n.*\"};
2638	my $continued_str_literal = qr{\+\s*\".*\"};
2639
2640	if ($rawline =~ /$quoted_newline_regex/) {
2641		# Backtrack to first line that does not contain only a quoted literal
2642		# and assume that it is the start of the statement.
2643		my $i = $linenr - 2;
2644
2645		while (($i >= 0) & $rawlines[$i] =~ /$continued_str_literal/) {
2646			$i--;
2647		}
2648	}
2649
2650	}
2651
2652	# If we have no input at all, then there is nothing to report on
2653	# so just keep quiet.
2654	if ($#rawlines == -1) {
2655		return 1;
2656	}
2657
2658	# In mailback mode only produce a report in the negative, for
2659	# things that appear to be patches.
2660	if ($mailback && ($clean == 1 || !$is_patch)) {
2661		return 1;
2662	}
2663
2664	# This is not a patch, and we are are in 'no-patch' mode so
2665	# just keep quiet.
2666	if (!$chk_patch && !$is_patch) {
2667		return 1;
2668	}
2669
2670	if (!$is_patch && $filename !~ /cover-letter\.patch$/) {
2671		ERROR("Does not appear to be a unified-diff format patch\n");
2672	}
2673
2674	print report_dump();
2675	if ($summary && !($clean == 1 && $quiet == 1)) {
2676		print "$filename " if ($summary_file);
2677		print "total: $cnt_error errors, $cnt_warn warnings, " .
2678			"$cnt_lines lines checked\n";
2679		print "\n" if ($quiet == 0);
2680	}
2681
2682	if ($quiet == 0) {
2683		# If there were whitespace errors which cleanpatch can fix
2684		# then suggest that.
2685#		if ($rpt_cleaners) {
2686#			print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
2687#			print "      scripts/cleanfile\n\n";
2688#		}
2689	}
2690
2691	if ($clean == 1 && $quiet == 0) {
2692		print "$vname has no obvious style problems and is ready for submission.\n"
2693	}
2694
2695	return ($no_warnings ? $clean : $cnt_error == 0);
2696}
2697