xref: /openbmc/qemu/scripts/checkpatch.pl (revision 61a67f71) 
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;
10
11my $P = $0;
12$P =~ s@.*/@@g;
13
14my $V = '0.31';
15
16use Getopt::Long qw(:config no_auto_abbrev);
17
18my $quiet = 0;
19my $tree = 1;
20my $chk_signoff = 1;
21my $chk_patch = 1;
22my $tst_only;
23my $emacs = 0;
24my $terse = 0;
25my $file = 0;
26my $no_warnings = 0;
27my $summary = 1;
28my $mailback = 0;
29my $summary_file = 0;
30my $root;
31my %debug;
32my $help = 0;
33
34sub help {
35	my ($exitcode) = @_;
36
37	print << "EOM";
38Usage: $P [OPTION]... [FILE]...
39Version: $V
40
41Options:
42  -q, --quiet                quiet
43  --no-tree                  run without a kernel tree
44  --no-signoff               do not check for 'Signed-off-by' line
45  --patch                    treat FILE as patchfile (default)
46  --emacs                    emacs compile window format
47  --terse                    one line per report
48  -f, --file                 treat FILE as regular source file
49  --strict                   fail if only warnings are found
50  --root=PATH                PATH to the kernel tree root
51  --no-summary               suppress the per-file summary
52  --mailback                 only produce a report in case of warnings/errors
53  --summary-file             include the filename in summary
54  --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
55                             'values', 'possible', 'type', and 'attr' (default
56                             is all off)
57  --test-only=WORD           report only warnings/errors containing WORD
58                             literally
59  -h, --help, --version      display this help and exit
60
61When FILE is - read standard input.
62EOM
63
64	exit($exitcode);
65}
66
67GetOptions(
68	'q|quiet+'	=> \$quiet,
69	'tree!'		=> \$tree,
70	'signoff!'	=> \$chk_signoff,
71	'patch!'	=> \$chk_patch,
72	'emacs!'	=> \$emacs,
73	'terse!'	=> \$terse,
74	'f|file!'	=> \$file,
75	'strict!'	=> \$no_warnings,
76	'root=s'	=> \$root,
77	'summary!'	=> \$summary,
78	'mailback!'	=> \$mailback,
79	'summary-file!'	=> \$summary_file,
80
81	'debug=s'	=> \%debug,
82	'test-only=s'	=> \$tst_only,
83	'h|help'	=> \$help,
84	'version'	=> \$help
85) or help(1);
86
87help(0) if ($help);
88
89my $exit = 0;
90
91if ($#ARGV < 0) {
92	print "$P: no input files\n";
93	exit(1);
94}
95
96my $dbg_values = 0;
97my $dbg_possible = 0;
98my $dbg_type = 0;
99my $dbg_attr = 0;
100my $dbg_adv_dcs = 0;
101my $dbg_adv_checking = 0;
102my $dbg_adv_apw = 0;
103for my $key (keys %debug) {
104	## no critic
105	eval "\${dbg_$key} = '$debug{$key}';";
106	die "$@" if ($@);
107}
108
109my $rpt_cleaners = 0;
110
111if ($terse) {
112	$emacs = 1;
113	$quiet++;
114}
115
116if ($tree) {
117	if (defined $root) {
118		if (!top_of_kernel_tree($root)) {
119			die "$P: $root: --root does not point at a valid tree\n";
120		}
121	} else {
122		if (top_of_kernel_tree('.')) {
123			$root = '.';
124		} elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
125						top_of_kernel_tree($1)) {
126			$root = $1;
127		}
128	}
129
130	if (!defined $root) {
131		print "Must be run from the top-level dir. of a kernel tree\n";
132		exit(2);
133	}
134}
135
136my $emitted_corrupt = 0;
137
138our $Ident	= qr{
139			[A-Za-z_][A-Za-z\d_]*
140			(?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
141		}x;
142our $Storage	= qr{extern|static|asmlinkage};
143our $Sparse	= qr{
144			__force
145		}x;
146
147# Notes to $Attribute:
148our $Attribute	= qr{
149			const|
150			volatile|
151			QEMU_NORETURN|
152			QEMU_WARN_UNUSED_RESULT|
153			QEMU_SENTINEL|
154			QEMU_ARTIFICIAL|
155			QEMU_PACKED|
156			GCC_FMT_ATTR
157		  }x;
158our $Modifier;
159our $Inline	= qr{inline};
160our $Member	= qr{->$Ident|\.$Ident|\[[^]]*\]};
161our $Lval	= qr{$Ident(?:$Member)*};
162
163our $Constant	= qr{(?:[0-9]+|0x[0-9a-fA-F]+)[UL]*};
164our $Assignment	= qr{(?:\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=)};
165our $Compare    = qr{<=|>=|==|!=|<|>};
166our $Operators	= qr{
167			<=|>=|==|!=|
168			=>|->|<<|>>|<|>|!|~|
169			&&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%
170		  }x;
171
172our $NonptrType;
173our $Type;
174our $Declare;
175
176our $UTF8	= qr {
177	[\x09\x0A\x0D\x20-\x7E]              # ASCII
178	| [\xC2-\xDF][\x80-\xBF]             # non-overlong 2-byte
179	|  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
180	| [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
181	|  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
182	|  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
183	| [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
184	|  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
185}x;
186
187# There are still some false positives, but this catches most
188# common cases.
189our $typeTypedefs = qr{(?x:
190        [A-Z][A-Z\d_]*[a-z][A-Za-z\d_]*     # camelcase
191        | [A-Z][A-Z\d_]*AIOCB               # all uppercase
192        | [A-Z][A-Z\d_]*CPU                 # all uppercase
193        | QEMUBH                            # all uppercase
194)};
195
196our @typeList = (
197	qr{void},
198	qr{(?:unsigned\s+)?char},
199	qr{(?:unsigned\s+)?short},
200	qr{(?:unsigned\s+)?int},
201	qr{(?:unsigned\s+)?long},
202	qr{(?:unsigned\s+)?long\s+int},
203	qr{(?:unsigned\s+)?long\s+long},
204	qr{(?:unsigned\s+)?long\s+long\s+int},
205	qr{unsigned},
206	qr{float},
207	qr{double},
208	qr{bool},
209	qr{struct\s+$Ident},
210	qr{union\s+$Ident},
211	qr{enum\s+$Ident},
212	qr{${Ident}_t},
213	qr{${Ident}_handler},
214	qr{${Ident}_handler_fn},
215	qr{target_(?:u)?long},
216);
217
218# This can be modified by sub possible.  Since it can be empty, be careful
219# about regexes that always match, because they can cause infinite loops.
220our @modifierList = (
221);
222
223sub build_types {
224	my $all = "(?x:  \n" . join("|\n  ", @typeList) . "\n)";
225	if (@modifierList > 0) {
226		my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
227		$Modifier = qr{(?:$Attribute|$Sparse|$mods)};
228	} else {
229		$Modifier = qr{(?:$Attribute|$Sparse)};
230	}
231	$NonptrType	= qr{
232			(?:$Modifier\s+|const\s+)*
233			(?:
234				(?:typeof|__typeof__)\s*\(\s*\**\s*$Ident\s*\)|
235				(?:$typeTypedefs\b)|
236				(?:${all}\b)
237			)
238			(?:\s+$Modifier|\s+const)*
239		  }x;
240	$Type	= qr{
241			$NonptrType
242			(?:[\s\*]+\s*const|[\s\*]+|(?:\s*\[\s*\])+)?
243			(?:\s+$Inline|\s+$Modifier)*
244		  }x;
245	$Declare	= qr{(?:$Storage\s+)?$Type};
246}
247build_types();
248
249$chk_signoff = 0 if ($file);
250
251my @rawlines = ();
252my @lines = ();
253my $vname;
254for my $filename (@ARGV) {
255	my $FILE;
256	if ($file) {
257		open($FILE, '-|', "diff -u /dev/null $filename") ||
258			die "$P: $filename: diff failed - $!\n";
259	} elsif ($filename eq '-') {
260		open($FILE, '<&STDIN');
261	} else {
262		open($FILE, '<', "$filename") ||
263			die "$P: $filename: open failed - $!\n";
264	}
265	if ($filename eq '-') {
266		$vname = 'Your patch';
267	} else {
268		$vname = $filename;
269	}
270	while (<$FILE>) {
271		chomp;
272		push(@rawlines, $_);
273	}
274	close($FILE);
275	if (!process($filename)) {
276		$exit = 1;
277	}
278	@rawlines = ();
279	@lines = ();
280}
281
282exit($exit);
283
284sub top_of_kernel_tree {
285	my ($root) = @_;
286
287	my @tree_check = (
288		"COPYING", "MAINTAINERS", "Makefile",
289		"README", "docs", "VERSION",
290		"vl.c"
291	);
292
293	foreach my $check (@tree_check) {
294		if (! -e $root . '/' . $check) {
295			return 0;
296		}
297	}
298	return 1;
299}
300
301sub expand_tabs {
302	my ($str) = @_;
303
304	my $res = '';
305	my $n = 0;
306	for my $c (split(//, $str)) {
307		if ($c eq "\t") {
308			$res .= ' ';
309			$n++;
310			for (; ($n % 8) != 0; $n++) {
311				$res .= ' ';
312			}
313			next;
314		}
315		$res .= $c;
316		$n++;
317	}
318
319	return $res;
320}
321sub copy_spacing {
322	(my $res = shift) =~ tr/\t/ /c;
323	return $res;
324}
325
326sub line_stats {
327	my ($line) = @_;
328
329	# Drop the diff line leader and expand tabs
330	$line =~ s/^.//;
331	$line = expand_tabs($line);
332
333	# Pick the indent from the front of the line.
334	my ($white) = ($line =~ /^(\s*)/);
335
336	return (length($line), length($white));
337}
338
339my $sanitise_quote = '';
340
341sub sanitise_line_reset {
342	my ($in_comment) = @_;
343
344	if ($in_comment) {
345		$sanitise_quote = '*/';
346	} else {
347		$sanitise_quote = '';
348	}
349}
350sub sanitise_line {
351	my ($line) = @_;
352
353	my $res = '';
354	my $l = '';
355
356	my $qlen = 0;
357	my $off = 0;
358	my $c;
359
360	# Always copy over the diff marker.
361	$res = substr($line, 0, 1);
362
363	for ($off = 1; $off < length($line); $off++) {
364		$c = substr($line, $off, 1);
365
366		# Comments we are wacking completely including the begin
367		# and end, all to $;.
368		if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
369			$sanitise_quote = '*/';
370
371			substr($res, $off, 2, "$;$;");
372			$off++;
373			next;
374		}
375		if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
376			$sanitise_quote = '';
377			substr($res, $off, 2, "$;$;");
378			$off++;
379			next;
380		}
381		if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
382			$sanitise_quote = '//';
383
384			substr($res, $off, 2, $sanitise_quote);
385			$off++;
386			next;
387		}
388
389		# A \ in a string means ignore the next character.
390		if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
391		    $c eq "\\") {
392			substr($res, $off, 2, 'XX');
393			$off++;
394			next;
395		}
396		# Regular quotes.
397		if ($c eq "'" || $c eq '"') {
398			if ($sanitise_quote eq '') {
399				$sanitise_quote = $c;
400
401				substr($res, $off, 1, $c);
402				next;
403			} elsif ($sanitise_quote eq $c) {
404				$sanitise_quote = '';
405			}
406		}
407
408		#print "c<$c> SQ<$sanitise_quote>\n";
409		if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
410			substr($res, $off, 1, $;);
411		} elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
412			substr($res, $off, 1, $;);
413		} elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
414			substr($res, $off, 1, 'X');
415		} else {
416			substr($res, $off, 1, $c);
417		}
418	}
419
420	if ($sanitise_quote eq '//') {
421		$sanitise_quote = '';
422	}
423
424	# The pathname on a #include may be surrounded by '<' and '>'.
425	if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
426		my $clean = 'X' x length($1);
427		$res =~ s@\<.*\>@<$clean>@;
428
429	# The whole of a #error is a string.
430	} elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
431		my $clean = 'X' x length($1);
432		$res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
433	}
434
435	return $res;
436}
437
438sub ctx_statement_block {
439	my ($linenr, $remain, $off) = @_;
440	my $line = $linenr - 1;
441	my $blk = '';
442	my $soff = $off;
443	my $coff = $off - 1;
444	my $coff_set = 0;
445
446	my $loff = 0;
447
448	my $type = '';
449	my $level = 0;
450	my @stack = ();
451	my $p;
452	my $c;
453	my $len = 0;
454
455	my $remainder;
456	while (1) {
457		@stack = (['', 0]) if ($#stack == -1);
458
459		#warn "CSB: blk<$blk> remain<$remain>\n";
460		# If we are about to drop off the end, pull in more
461		# context.
462		if ($off >= $len) {
463			for (; $remain > 0; $line++) {
464				last if (!defined $lines[$line]);
465				next if ($lines[$line] =~ /^-/);
466				$remain--;
467				$loff = $len;
468				$blk .= $lines[$line] . "\n";
469				$len = length($blk);
470				$line++;
471				last;
472			}
473			# Bail if there is no further context.
474			#warn "CSB: blk<$blk> off<$off> len<$len>\n";
475			if ($off >= $len) {
476				last;
477			}
478		}
479		$p = $c;
480		$c = substr($blk, $off, 1);
481		$remainder = substr($blk, $off);
482
483		#warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
484
485		# Handle nested #if/#else.
486		if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
487			push(@stack, [ $type, $level ]);
488		} elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
489			($type, $level) = @{$stack[$#stack - 1]};
490		} elsif ($remainder =~ /^#\s*endif\b/) {
491			($type, $level) = @{pop(@stack)};
492		}
493
494		# Statement ends at the ';' or a close '}' at the
495		# outermost level.
496		if ($level == 0 && $c eq ';') {
497			last;
498		}
499
500		# An else is really a conditional as long as its not else if
501		if ($level == 0 && $coff_set == 0 &&
502				(!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
503				$remainder =~ /^(else)(?:\s|{)/ &&
504				$remainder !~ /^else\s+if\b/) {
505			$coff = $off + length($1) - 1;
506			$coff_set = 1;
507			#warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
508			#warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
509		}
510
511		if (($type eq '' || $type eq '(') && $c eq '(') {
512			$level++;
513			$type = '(';
514		}
515		if ($type eq '(' && $c eq ')') {
516			$level--;
517			$type = ($level != 0)? '(' : '';
518
519			if ($level == 0 && $coff < $soff) {
520				$coff = $off;
521				$coff_set = 1;
522				#warn "CSB: mark coff<$coff>\n";
523			}
524		}
525		if (($type eq '' || $type eq '{') && $c eq '{') {
526			$level++;
527			$type = '{';
528		}
529		if ($type eq '{' && $c eq '}') {
530			$level--;
531			$type = ($level != 0)? '{' : '';
532
533			if ($level == 0) {
534				if (substr($blk, $off + 1, 1) eq ';') {
535					$off++;
536				}
537				last;
538			}
539		}
540		$off++;
541	}
542	# We are truly at the end, so shuffle to the next line.
543	if ($off == $len) {
544		$loff = $len + 1;
545		$line++;
546		$remain--;
547	}
548
549	my $statement = substr($blk, $soff, $off - $soff + 1);
550	my $condition = substr($blk, $soff, $coff - $soff + 1);
551
552	#warn "STATEMENT<$statement>\n";
553	#warn "CONDITION<$condition>\n";
554
555	#print "coff<$coff> soff<$off> loff<$loff>\n";
556
557	return ($statement, $condition,
558			$line, $remain + 1, $off - $loff + 1, $level);
559}
560
561sub statement_lines {
562	my ($stmt) = @_;
563
564	# Strip the diff line prefixes and rip blank lines at start and end.
565	$stmt =~ s/(^|\n)./$1/g;
566	$stmt =~ s/^\s*//;
567	$stmt =~ s/\s*$//;
568
569	my @stmt_lines = ($stmt =~ /\n/g);
570
571	return $#stmt_lines + 2;
572}
573
574sub statement_rawlines {
575	my ($stmt) = @_;
576
577	my @stmt_lines = ($stmt =~ /\n/g);
578
579	return $#stmt_lines + 2;
580}
581
582sub statement_block_size {
583	my ($stmt) = @_;
584
585	$stmt =~ s/(^|\n)./$1/g;
586	$stmt =~ s/^\s*\{//;
587	$stmt =~ s/}\s*$//;
588	$stmt =~ s/^\s*//;
589	$stmt =~ s/\s*$//;
590
591	my @stmt_lines = ($stmt =~ /\n/g);
592	my @stmt_statements = ($stmt =~ /;/g);
593
594	my $stmt_lines = $#stmt_lines + 2;
595	my $stmt_statements = $#stmt_statements + 1;
596
597	if ($stmt_lines > $stmt_statements) {
598		return $stmt_lines;
599	} else {
600		return $stmt_statements;
601	}
602}
603
604sub ctx_statement_full {
605	my ($linenr, $remain, $off) = @_;
606	my ($statement, $condition, $level);
607
608	my (@chunks);
609
610	# Grab the first conditional/block pair.
611	($statement, $condition, $linenr, $remain, $off, $level) =
612				ctx_statement_block($linenr, $remain, $off);
613	#print "F: c<$condition> s<$statement> remain<$remain>\n";
614	push(@chunks, [ $condition, $statement ]);
615	if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
616		return ($level, $linenr, @chunks);
617	}
618
619	# Pull in the following conditional/block pairs and see if they
620	# could continue the statement.
621	for (;;) {
622		($statement, $condition, $linenr, $remain, $off, $level) =
623				ctx_statement_block($linenr, $remain, $off);
624		#print "C: c<$condition> s<$statement> remain<$remain>\n";
625		last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
626		#print "C: push\n";
627		push(@chunks, [ $condition, $statement ]);
628	}
629
630	return ($level, $linenr, @chunks);
631}
632
633sub ctx_block_get {
634	my ($linenr, $remain, $outer, $open, $close, $off) = @_;
635	my $line;
636	my $start = $linenr - 1;
637	my $blk = '';
638	my @o;
639	my @c;
640	my @res = ();
641
642	my $level = 0;
643	my @stack = ($level);
644	for ($line = $start; $remain > 0; $line++) {
645		next if ($rawlines[$line] =~ /^-/);
646		$remain--;
647
648		$blk .= $rawlines[$line];
649
650		# Handle nested #if/#else.
651		if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
652			push(@stack, $level);
653		} elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
654			$level = $stack[$#stack - 1];
655		} elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
656			$level = pop(@stack);
657		}
658
659		foreach my $c (split(//, $lines[$line])) {
660			##print "C<$c>L<$level><$open$close>O<$off>\n";
661			if ($off > 0) {
662				$off--;
663				next;
664			}
665
666			if ($c eq $close && $level > 0) {
667				$level--;
668				last if ($level == 0);
669			} elsif ($c eq $open) {
670				$level++;
671			}
672		}
673
674		if (!$outer || $level <= 1) {
675			push(@res, $rawlines[$line]);
676		}
677
678		last if ($level == 0);
679	}
680
681	return ($level, @res);
682}
683sub ctx_block_outer {
684	my ($linenr, $remain) = @_;
685
686	my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
687	return @r;
688}
689sub ctx_block {
690	my ($linenr, $remain) = @_;
691
692	my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
693	return @r;
694}
695sub ctx_statement {
696	my ($linenr, $remain, $off) = @_;
697
698	my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
699	return @r;
700}
701sub ctx_block_level {
702	my ($linenr, $remain) = @_;
703
704	return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
705}
706sub ctx_statement_level {
707	my ($linenr, $remain, $off) = @_;
708
709	return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
710}
711
712sub ctx_locate_comment {
713	my ($first_line, $end_line) = @_;
714
715	# Catch a comment on the end of the line itself.
716	my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
717	return $current_comment if (defined $current_comment);
718
719	# Look through the context and try and figure out if there is a
720	# comment.
721	my $in_comment = 0;
722	$current_comment = '';
723	for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
724		my $line = $rawlines[$linenr - 1];
725		#warn "           $line\n";
726		if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
727			$in_comment = 1;
728		}
729		if ($line =~ m@/\*@) {
730			$in_comment = 1;
731		}
732		if (!$in_comment && $current_comment ne '') {
733			$current_comment = '';
734		}
735		$current_comment .= $line . "\n" if ($in_comment);
736		if ($line =~ m@\*/@) {
737			$in_comment = 0;
738		}
739	}
740
741	chomp($current_comment);
742	return($current_comment);
743}
744sub ctx_has_comment {
745	my ($first_line, $end_line) = @_;
746	my $cmt = ctx_locate_comment($first_line, $end_line);
747
748	##print "LINE: $rawlines[$end_line - 1 ]\n";
749	##print "CMMT: $cmt\n";
750
751	return ($cmt ne '');
752}
753
754sub raw_line {
755	my ($linenr, $cnt) = @_;
756
757	my $offset = $linenr - 1;
758	$cnt++;
759
760	my $line;
761	while ($cnt) {
762		$line = $rawlines[$offset++];
763		next if (defined($line) && $line =~ /^-/);
764		$cnt--;
765	}
766
767	return $line;
768}
769
770sub cat_vet {
771	my ($vet) = @_;
772	my ($res, $coded);
773
774	$res = '';
775	while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
776		$res .= $1;
777		if ($2 ne '') {
778			$coded = sprintf("^%c", unpack('C', $2) + 64);
779			$res .= $coded;
780		}
781	}
782	$res =~ s/$/\$/;
783
784	return $res;
785}
786
787my $av_preprocessor = 0;
788my $av_pending;
789my @av_paren_type;
790my $av_pend_colon;
791
792sub annotate_reset {
793	$av_preprocessor = 0;
794	$av_pending = '_';
795	@av_paren_type = ('E');
796	$av_pend_colon = 'O';
797}
798
799sub annotate_values {
800	my ($stream, $type) = @_;
801
802	my $res;
803	my $var = '_' x length($stream);
804	my $cur = $stream;
805
806	print "$stream\n" if ($dbg_values > 1);
807
808	while (length($cur)) {
809		@av_paren_type = ('E') if ($#av_paren_type < 0);
810		print " <" . join('', @av_paren_type) .
811				"> <$type> <$av_pending>" if ($dbg_values > 1);
812		if ($cur =~ /^(\s+)/o) {
813			print "WS($1)\n" if ($dbg_values > 1);
814			if ($1 =~ /\n/ && $av_preprocessor) {
815				$type = pop(@av_paren_type);
816				$av_preprocessor = 0;
817			}
818
819		} elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
820			print "CAST($1)\n" if ($dbg_values > 1);
821			push(@av_paren_type, $type);
822			$type = 'C';
823
824		} elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
825			print "DECLARE($1)\n" if ($dbg_values > 1);
826			$type = 'T';
827
828		} elsif ($cur =~ /^($Modifier)\s*/) {
829			print "MODIFIER($1)\n" if ($dbg_values > 1);
830			$type = 'T';
831
832		} elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
833			print "DEFINE($1,$2)\n" if ($dbg_values > 1);
834			$av_preprocessor = 1;
835			push(@av_paren_type, $type);
836			if ($2 ne '') {
837				$av_pending = 'N';
838			}
839			$type = 'E';
840
841		} elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
842			print "UNDEF($1)\n" if ($dbg_values > 1);
843			$av_preprocessor = 1;
844			push(@av_paren_type, $type);
845
846		} elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
847			print "PRE_START($1)\n" if ($dbg_values > 1);
848			$av_preprocessor = 1;
849
850			push(@av_paren_type, $type);
851			push(@av_paren_type, $type);
852			$type = 'E';
853
854		} elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
855			print "PRE_RESTART($1)\n" if ($dbg_values > 1);
856			$av_preprocessor = 1;
857
858			push(@av_paren_type, $av_paren_type[$#av_paren_type]);
859
860			$type = 'E';
861
862		} elsif ($cur =~ /^(\#\s*(?:endif))/o) {
863			print "PRE_END($1)\n" if ($dbg_values > 1);
864
865			$av_preprocessor = 1;
866
867			# Assume all arms of the conditional end as this
868			# one does, and continue as if the #endif was not here.
869			pop(@av_paren_type);
870			push(@av_paren_type, $type);
871			$type = 'E';
872
873		} elsif ($cur =~ /^(\\\n)/o) {
874			print "PRECONT($1)\n" if ($dbg_values > 1);
875
876		} elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
877			print "ATTR($1)\n" if ($dbg_values > 1);
878			$av_pending = $type;
879			$type = 'N';
880
881		} elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
882			print "SIZEOF($1)\n" if ($dbg_values > 1);
883			if (defined $2) {
884				$av_pending = 'V';
885			}
886			$type = 'N';
887
888		} elsif ($cur =~ /^(if|while|for)\b/o) {
889			print "COND($1)\n" if ($dbg_values > 1);
890			$av_pending = 'E';
891			$type = 'N';
892
893		} elsif ($cur =~/^(case)/o) {
894			print "CASE($1)\n" if ($dbg_values > 1);
895			$av_pend_colon = 'C';
896			$type = 'N';
897
898		} elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
899			print "KEYWORD($1)\n" if ($dbg_values > 1);
900			$type = 'N';
901
902		} elsif ($cur =~ /^(\()/o) {
903			print "PAREN('$1')\n" if ($dbg_values > 1);
904			push(@av_paren_type, $av_pending);
905			$av_pending = '_';
906			$type = 'N';
907
908		} elsif ($cur =~ /^(\))/o) {
909			my $new_type = pop(@av_paren_type);
910			if ($new_type ne '_') {
911				$type = $new_type;
912				print "PAREN('$1') -> $type\n"
913							if ($dbg_values > 1);
914			} else {
915				print "PAREN('$1')\n" if ($dbg_values > 1);
916			}
917
918		} elsif ($cur =~ /^($Ident)\s*\(/o) {
919			print "FUNC($1)\n" if ($dbg_values > 1);
920			$type = 'V';
921			$av_pending = 'V';
922
923		} elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
924			if (defined $2 && $type eq 'C' || $type eq 'T') {
925				$av_pend_colon = 'B';
926			} elsif ($type eq 'E') {
927				$av_pend_colon = 'L';
928			}
929			print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
930			$type = 'V';
931
932		} elsif ($cur =~ /^($Ident|$Constant)/o) {
933			print "IDENT($1)\n" if ($dbg_values > 1);
934			$type = 'V';
935
936		} elsif ($cur =~ /^($Assignment)/o) {
937			print "ASSIGN($1)\n" if ($dbg_values > 1);
938			$type = 'N';
939
940		} elsif ($cur =~/^(;|{|})/) {
941			print "END($1)\n" if ($dbg_values > 1);
942			$type = 'E';
943			$av_pend_colon = 'O';
944
945		} elsif ($cur =~/^(,)/) {
946			print "COMMA($1)\n" if ($dbg_values > 1);
947			$type = 'C';
948
949		} elsif ($cur =~ /^(\?)/o) {
950			print "QUESTION($1)\n" if ($dbg_values > 1);
951			$type = 'N';
952
953		} elsif ($cur =~ /^(:)/o) {
954			print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
955
956			substr($var, length($res), 1, $av_pend_colon);
957			if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
958				$type = 'E';
959			} else {
960				$type = 'N';
961			}
962			$av_pend_colon = 'O';
963
964		} elsif ($cur =~ /^(\[)/o) {
965			print "CLOSE($1)\n" if ($dbg_values > 1);
966			$type = 'N';
967
968		} elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
969			my $variant;
970
971			print "OPV($1)\n" if ($dbg_values > 1);
972			if ($type eq 'V') {
973				$variant = 'B';
974			} else {
975				$variant = 'U';
976			}
977
978			substr($var, length($res), 1, $variant);
979			$type = 'N';
980
981		} elsif ($cur =~ /^($Operators)/o) {
982			print "OP($1)\n" if ($dbg_values > 1);
983			if ($1 ne '++' && $1 ne '--') {
984				$type = 'N';
985			}
986
987		} elsif ($cur =~ /(^.)/o) {
988			print "C($1)\n" if ($dbg_values > 1);
989		}
990		if (defined $1) {
991			$cur = substr($cur, length($1));
992			$res .= $type x length($1);
993		}
994	}
995
996	return ($res, $var);
997}
998
999sub possible {
1000	my ($possible, $line) = @_;
1001	my $notPermitted = qr{(?:
1002		^(?:
1003			$Modifier|
1004			$Storage|
1005			$Type|
1006			DEFINE_\S+
1007		)$|
1008		^(?:
1009			goto|
1010			return|
1011			case|
1012			else|
1013			asm|__asm__|
1014			do|
1015			\#|
1016			\#\#
1017		)(?:\s|$)|
1018		^(?:typedef|struct|enum)\b
1019	    )}x;
1020	warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
1021	if ($possible !~ $notPermitted) {
1022		# Check for modifiers.
1023		$possible =~ s/\s*$Storage\s*//g;
1024		$possible =~ s/\s*$Sparse\s*//g;
1025		if ($possible =~ /^\s*$/) {
1026
1027		} elsif ($possible =~ /\s/) {
1028			$possible =~ s/\s*$Type\s*//g;
1029			for my $modifier (split(' ', $possible)) {
1030				if ($modifier !~ $notPermitted) {
1031					warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
1032					push(@modifierList, $modifier);
1033				}
1034			}
1035
1036		} else {
1037			warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
1038			push(@typeList, $possible);
1039		}
1040		build_types();
1041	} else {
1042		warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
1043	}
1044}
1045
1046my $prefix = '';
1047
1048sub report {
1049	if (defined $tst_only && $_[0] !~ /\Q$tst_only\E/) {
1050		return 0;
1051	}
1052	my $line = $prefix . $_[0];
1053
1054	$line = (split('\n', $line))[0] . "\n" if ($terse);
1055
1056	push(our @report, $line);
1057
1058	return 1;
1059}
1060sub report_dump {
1061	our @report;
1062}
1063sub ERROR {
1064	if (report("ERROR: $_[0]\n")) {
1065		our $clean = 0;
1066		our $cnt_error++;
1067	}
1068}
1069sub WARN {
1070	if (report("WARNING: $_[0]\n")) {
1071		our $clean = 0;
1072		our $cnt_warn++;
1073	}
1074}
1075
1076sub process {
1077	my $filename = shift;
1078
1079	my $linenr=0;
1080	my $prevline="";
1081	my $prevrawline="";
1082	my $stashline="";
1083	my $stashrawline="";
1084
1085	my $length;
1086	my $indent;
1087	my $previndent=0;
1088	my $stashindent=0;
1089
1090	our $clean = 1;
1091	my $signoff = 0;
1092	my $is_patch = 0;
1093
1094	our @report = ();
1095	our $cnt_lines = 0;
1096	our $cnt_error = 0;
1097	our $cnt_warn = 0;
1098	our $cnt_chk = 0;
1099
1100	# Trace the real file/line as we go.
1101	my $realfile = '';
1102	my $realline = 0;
1103	my $realcnt = 0;
1104	my $here = '';
1105	my $in_comment = 0;
1106	my $comment_edge = 0;
1107	my $first_line = 0;
1108	my $p1_prefix = '';
1109
1110	my $prev_values = 'E';
1111
1112	# suppression flags
1113	my %suppress_ifbraces;
1114	my %suppress_whiletrailers;
1115	my %suppress_export;
1116
1117	# Pre-scan the patch sanitizing the lines.
1118
1119	sanitise_line_reset();
1120	my $line;
1121	foreach my $rawline (@rawlines) {
1122		$linenr++;
1123		$line = $rawline;
1124
1125		if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1126			$realline=$1-1;
1127			if (defined $2) {
1128				$realcnt=$3+1;
1129			} else {
1130				$realcnt=1+1;
1131			}
1132			$in_comment = 0;
1133
1134			# Guestimate if this is a continuing comment.  Run
1135			# the context looking for a comment "edge".  If this
1136			# edge is a close comment then we must be in a comment
1137			# at context start.
1138			my $edge;
1139			my $cnt = $realcnt;
1140			for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1141				next if (defined $rawlines[$ln - 1] &&
1142					 $rawlines[$ln - 1] =~ /^-/);
1143				$cnt--;
1144				#print "RAW<$rawlines[$ln - 1]>\n";
1145				last if (!defined $rawlines[$ln - 1]);
1146				if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1147				    $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1148					($edge) = $1;
1149					last;
1150				}
1151			}
1152			if (defined $edge && $edge eq '*/') {
1153				$in_comment = 1;
1154			}
1155
1156			# Guestimate if this is a continuing comment.  If this
1157			# is the start of a diff block and this line starts
1158			# ' *' then it is very likely a comment.
1159			if (!defined $edge &&
1160			    $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1161			{
1162				$in_comment = 1;
1163			}
1164
1165			##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1166			sanitise_line_reset($in_comment);
1167
1168		} elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1169			# Standardise the strings and chars within the input to
1170			# simplify matching -- only bother with positive lines.
1171			$line = sanitise_line($rawline);
1172		}
1173		push(@lines, $line);
1174
1175		if ($realcnt > 1) {
1176			$realcnt-- if ($line =~ /^(?:\+| |$)/);
1177		} else {
1178			$realcnt = 0;
1179		}
1180
1181		#print "==>$rawline\n";
1182		#print "-->$line\n";
1183	}
1184
1185	$prefix = '';
1186
1187	$realcnt = 0;
1188	$linenr = 0;
1189	foreach my $line (@lines) {
1190		$linenr++;
1191
1192		my $rawline = $rawlines[$linenr - 1];
1193
1194#extract the line range in the file after the patch is applied
1195		if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1196			$is_patch = 1;
1197			$first_line = $linenr + 1;
1198			$realline=$1-1;
1199			if (defined $2) {
1200				$realcnt=$3+1;
1201			} else {
1202				$realcnt=1+1;
1203			}
1204			annotate_reset();
1205			$prev_values = 'E';
1206
1207			%suppress_ifbraces = ();
1208			%suppress_whiletrailers = ();
1209			%suppress_export = ();
1210			next;
1211
1212# track the line number as we move through the hunk, note that
1213# new versions of GNU diff omit the leading space on completely
1214# blank context lines so we need to count that too.
1215		} elsif ($line =~ /^( |\+|$)/) {
1216			$realline++;
1217			$realcnt-- if ($realcnt != 0);
1218
1219			# Measure the line length and indent.
1220			($length, $indent) = line_stats($rawline);
1221
1222			# Track the previous line.
1223			($prevline, $stashline) = ($stashline, $line);
1224			($previndent, $stashindent) = ($stashindent, $indent);
1225			($prevrawline, $stashrawline) = ($stashrawline, $rawline);
1226
1227			#warn "line<$line>\n";
1228
1229		} elsif ($realcnt == 1) {
1230			$realcnt--;
1231		}
1232
1233		my $hunk_line = ($realcnt != 0);
1234
1235#make up the handle for any error we report on this line
1236		$prefix = "$filename:$realline: " if ($emacs && $file);
1237		$prefix = "$filename:$linenr: " if ($emacs && !$file);
1238
1239		$here = "#$linenr: " if (!$file);
1240		$here = "#$realline: " if ($file);
1241
1242		# extract the filename as it passes
1243		if ($line =~ /^diff --git.*?(\S+)$/) {
1244			$realfile = $1;
1245			$realfile =~ s@^([^/]*)/@@;
1246
1247		} elsif ($line =~ /^\+\+\+\s+(\S+)/) {
1248			$realfile = $1;
1249			$realfile =~ s@^([^/]*)/@@;
1250
1251			$p1_prefix = $1;
1252			if (!$file && $tree && $p1_prefix ne '' &&
1253			    -e "$root/$p1_prefix") {
1254				WARN("patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
1255			}
1256
1257			next;
1258		}
1259
1260		$here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
1261
1262		my $hereline = "$here\n$rawline\n";
1263		my $herecurr = "$here\n$rawline\n";
1264		my $hereprev = "$here\n$prevrawline\n$rawline\n";
1265
1266		$cnt_lines++ if ($realcnt != 0);
1267
1268# Check for incorrect file permissions
1269		if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
1270			my $permhere = $here . "FILE: $realfile\n";
1271			if ($realfile =~ /(\bMakefile(?:\.objs)?|\.c|\.cc|\.cpp|\.h|\.mak|\.[sS])$/) {
1272				ERROR("do not set execute permissions for source files\n" . $permhere);
1273			}
1274		}
1275
1276# Accept git diff extended headers as valid patches
1277		if ($line =~ /^(?:rename|copy) (?:from|to) [\w\/\.\-]+\s*$/) {
1278			$is_patch = 1;
1279		}
1280
1281#check the patch for a signoff:
1282		if ($line =~ /^\s*signed-off-by:/i) {
1283			# This is a signoff, if ugly, so do not double report.
1284			$signoff++;
1285			if (!($line =~ /^\s*Signed-off-by:/)) {
1286				ERROR("The correct form is \"Signed-off-by\"\n" .
1287					$herecurr);
1288			}
1289			if ($line =~ /^\s*signed-off-by:\S/i) {
1290				ERROR("space required after Signed-off-by:\n" .
1291					$herecurr);
1292			}
1293		}
1294
1295# Check for wrappage within a valid hunk of the file
1296		if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
1297			ERROR("patch seems to be corrupt (line wrapped?)\n" .
1298				$herecurr) if (!$emitted_corrupt++);
1299		}
1300
1301# UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
1302		if (($realfile =~ /^$/ || $line =~ /^\+/) &&
1303		    $rawline !~ m/^$UTF8*$/) {
1304			my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
1305
1306			my $blank = copy_spacing($rawline);
1307			my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
1308			my $hereptr = "$hereline$ptr\n";
1309
1310			ERROR("Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
1311		}
1312
1313# ignore non-hunk lines and lines being removed
1314		next if (!$hunk_line || $line =~ /^-/);
1315
1316# ignore files that are being periodically imported from Linux
1317		next if ($realfile =~ /^(linux-headers|include\/standard-headers)\//);
1318
1319#trailing whitespace
1320		if ($line =~ /^\+.*\015/) {
1321			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1322			ERROR("DOS line endings\n" . $herevet);
1323
1324		} elsif ($realfile =~ /^docs\/.+\.txt/ ||
1325			 $realfile =~ /^docs\/.+\.md/) {
1326		    if ($rawline =~ /^\+\s+$/ && $rawline !~ /^\+ {4}$/) {
1327			# TODO: properly check we're in a code block
1328			#       (surrounding text is 4-column aligned)
1329			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1330			ERROR("code blocks in documentation should have " .
1331			      "empty lines with exactly 4 columns of " .
1332			      "whitespace\n" . $herevet);
1333		    }
1334		} elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
1335			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1336			ERROR("trailing whitespace\n" . $herevet);
1337			$rpt_cleaners = 1;
1338		}
1339
1340# check we are in a valid source file if not then ignore this hunk
1341		next if ($realfile !~ /\.(h|c|cpp|s|S|pl|py|sh)$/);
1342
1343#90 column limit
1344		if ($line =~ /^\+/ &&
1345		    !($line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
1346		    $length > 80)
1347		{
1348			if ($length > 90) {
1349				ERROR("line over 90 characters\n" . $herecurr);
1350			} else {
1351				WARN("line over 80 characters\n" . $herecurr);
1352			}
1353		}
1354
1355# check for spaces before a quoted newline
1356		if ($rawline =~ /^.*\".*\s\\n/) {
1357			ERROR("unnecessary whitespace before a quoted newline\n" . $herecurr);
1358		}
1359
1360# check for adding lines without a newline.
1361		if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
1362			ERROR("adding a line without newline at end of file\n" . $herecurr);
1363		}
1364
1365# check for RCS/CVS revision markers
1366		if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|\b)/) {
1367			ERROR("CVS style keyword markers, these will _not_ be updated\n". $herecurr);
1368		}
1369
1370# tabs are only allowed in assembly source code, and in
1371# some scripts we imported from other projects.
1372		next if ($realfile =~ /\.(s|S)$/);
1373		next if ($realfile =~ /(checkpatch|get_maintainer|texi2pod)\.pl$/);
1374
1375		if ($rawline =~ /^\+.*\t/) {
1376			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1377			ERROR("code indent should never use tabs\n" . $herevet);
1378			$rpt_cleaners = 1;
1379		}
1380
1381# check we are in a valid C source file if not then ignore this hunk
1382		next if ($realfile !~ /\.(h|c|cpp)$/);
1383
1384# Check for potential 'bare' types
1385		my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
1386		    $realline_next);
1387		if ($realcnt && $line =~ /.\s*\S/) {
1388			($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1389				ctx_statement_block($linenr, $realcnt, 0);
1390			$stat =~ s/\n./\n /g;
1391			$cond =~ s/\n./\n /g;
1392
1393			# Find the real next line.
1394			$realline_next = $line_nr_next;
1395			if (defined $realline_next &&
1396			    (!defined $lines[$realline_next - 1] ||
1397			     substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
1398				$realline_next++;
1399			}
1400
1401			my $s = $stat;
1402			$s =~ s/{.*$//s;
1403
1404			# Ignore goto labels.
1405			if ($s =~ /$Ident:\*$/s) {
1406
1407			# Ignore functions being called
1408			} elsif ($s =~ /^.\s*$Ident\s*\(/s) {
1409
1410			} elsif ($s =~ /^.\s*else\b/s) {
1411
1412			# declarations always start with types
1413			} elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
1414				my $type = $1;
1415				$type =~ s/\s+/ /g;
1416				possible($type, "A:" . $s);
1417
1418			# definitions in global scope can only start with types
1419			} elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
1420				possible($1, "B:" . $s);
1421			}
1422
1423			# any (foo ... *) is a pointer cast, and foo is a type
1424			while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
1425				possible($1, "C:" . $s);
1426			}
1427
1428			# Check for any sort of function declaration.
1429			# int foo(something bar, other baz);
1430			# void (*store_gdt)(x86_descr_ptr *);
1431			if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
1432				my ($name_len) = length($1);
1433
1434				my $ctx = $s;
1435				substr($ctx, 0, $name_len + 1, '');
1436				$ctx =~ s/\)[^\)]*$//;
1437
1438				for my $arg (split(/\s*,\s*/, $ctx)) {
1439					if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
1440
1441						possible($1, "D:" . $s);
1442					}
1443				}
1444			}
1445
1446		}
1447
1448#
1449# Checks which may be anchored in the context.
1450#
1451
1452# Check for switch () and associated case and default
1453# statements should be at the same indent.
1454		if ($line=~/\bswitch\s*\(.*\)/) {
1455			my $err = '';
1456			my $sep = '';
1457			my @ctx = ctx_block_outer($linenr, $realcnt);
1458			shift(@ctx);
1459			for my $ctx (@ctx) {
1460				my ($clen, $cindent) = line_stats($ctx);
1461				if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
1462							$indent != $cindent) {
1463					$err .= "$sep$ctx\n";
1464					$sep = '';
1465				} else {
1466					$sep = "[...]\n";
1467				}
1468			}
1469			if ($err ne '') {
1470				ERROR("switch and case should be at the same indent\n$hereline$err");
1471			}
1472		}
1473
1474# if/while/etc brace do not go on next line, unless defining a do while loop,
1475# or if that brace on the next line is for something else
1476		if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
1477			my $pre_ctx = "$1$2";
1478
1479			my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
1480			my $ctx_cnt = $realcnt - $#ctx - 1;
1481			my $ctx = join("\n", @ctx);
1482
1483			my $ctx_ln = $linenr;
1484			my $ctx_skip = $realcnt;
1485
1486			while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
1487					defined $lines[$ctx_ln - 1] &&
1488					$lines[$ctx_ln - 1] =~ /^-/)) {
1489				##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
1490				$ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
1491				$ctx_ln++;
1492			}
1493
1494			#print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
1495			#print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
1496
1497			# The length of the "previous line" is checked against 80 because it
1498			# includes the + at the beginning of the line (if the actual line has
1499			# 79 or 80 characters, it is no longer possible to add a space and an
1500			# opening brace there)
1501			if ($#ctx == 0 && $ctx !~ /{\s*/ &&
1502			    defined($lines[$ctx_ln - 1]) && $lines[$ctx_ln - 1] =~ /^\+\s*\{/ &&
1503			    defined($lines[$ctx_ln - 2]) && length($lines[$ctx_ln - 2]) < 80) {
1504				ERROR("that open brace { should be on the previous line\n" .
1505					"$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1506			}
1507			if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
1508			    $ctx =~ /\)\s*\;\s*$/ &&
1509			    defined $lines[$ctx_ln - 1])
1510			{
1511				my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
1512				if ($nindent > $indent) {
1513					ERROR("trailing semicolon indicates no statements, indent implies otherwise\n" .
1514						"$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1515				}
1516			}
1517		}
1518
1519# Check relative indent for conditionals and blocks.
1520		if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
1521			my ($s, $c) = ($stat, $cond);
1522
1523			substr($s, 0, length($c), '');
1524
1525			# Make sure we remove the line prefixes as we have
1526			# none on the first line, and are going to readd them
1527			# where necessary.
1528			$s =~ s/\n./\n/gs;
1529
1530			# Find out how long the conditional actually is.
1531			my @newlines = ($c =~ /\n/gs);
1532			my $cond_lines = 1 + $#newlines;
1533
1534			# We want to check the first line inside the block
1535			# starting at the end of the conditional, so remove:
1536			#  1) any blank line termination
1537			#  2) any opening brace { on end of the line
1538			#  3) any do (...) {
1539			my $continuation = 0;
1540			my $check = 0;
1541			$s =~ s/^.*\bdo\b//;
1542			$s =~ s/^\s*\{//;
1543			if ($s =~ s/^\s*\\//) {
1544				$continuation = 1;
1545			}
1546			if ($s =~ s/^\s*?\n//) {
1547				$check = 1;
1548				$cond_lines++;
1549			}
1550
1551			# Also ignore a loop construct at the end of a
1552			# preprocessor statement.
1553			if (($prevline =~ /^.\s*#\s*define\s/ ||
1554			    $prevline =~ /\\\s*$/) && $continuation == 0) {
1555				$check = 0;
1556			}
1557
1558			my $cond_ptr = -1;
1559			$continuation = 0;
1560			while ($cond_ptr != $cond_lines) {
1561				$cond_ptr = $cond_lines;
1562
1563				# If we see an #else/#elif then the code
1564				# is not linear.
1565				if ($s =~ /^\s*\#\s*(?:else|elif)/) {
1566					$check = 0;
1567				}
1568
1569				# Ignore:
1570				#  1) blank lines, they should be at 0,
1571				#  2) preprocessor lines, and
1572				#  3) labels.
1573				if ($continuation ||
1574				    $s =~ /^\s*?\n/ ||
1575				    $s =~ /^\s*#\s*?/ ||
1576				    $s =~ /^\s*$Ident\s*:/) {
1577					$continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
1578					if ($s =~ s/^.*?\n//) {
1579						$cond_lines++;
1580					}
1581				}
1582			}
1583
1584			my (undef, $sindent) = line_stats("+" . $s);
1585			my $stat_real = raw_line($linenr, $cond_lines);
1586
1587			# Check if either of these lines are modified, else
1588			# this is not this patch's fault.
1589			if (!defined($stat_real) ||
1590			    $stat !~ /^\+/ && $stat_real !~ /^\+/) {
1591				$check = 0;
1592			}
1593			if (defined($stat_real) && $cond_lines > 1) {
1594				$stat_real = "[...]\n$stat_real";
1595			}
1596
1597			#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";
1598
1599			if ($check && (($sindent % 4) != 0 ||
1600			    ($sindent <= $indent && $s ne ''))) {
1601				ERROR("suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
1602			}
1603		}
1604
1605		# Track the 'values' across context and added lines.
1606		my $opline = $line; $opline =~ s/^./ /;
1607		my ($curr_values, $curr_vars) =
1608				annotate_values($opline . "\n", $prev_values);
1609		$curr_values = $prev_values . $curr_values;
1610		if ($dbg_values) {
1611			my $outline = $opline; $outline =~ s/\t/ /g;
1612			print "$linenr > .$outline\n";
1613			print "$linenr > $curr_values\n";
1614			print "$linenr >  $curr_vars\n";
1615		}
1616		$prev_values = substr($curr_values, -1);
1617
1618#ignore lines not being added
1619		if ($line=~/^[^\+]/) {next;}
1620
1621# TEST: allow direct testing of the type matcher.
1622		if ($dbg_type) {
1623			if ($line =~ /^.\s*$Declare\s*$/) {
1624				ERROR("TEST: is type\n" . $herecurr);
1625			} elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
1626				ERROR("TEST: is not type ($1 is)\n". $herecurr);
1627			}
1628			next;
1629		}
1630# TEST: allow direct testing of the attribute matcher.
1631		if ($dbg_attr) {
1632			if ($line =~ /^.\s*$Modifier\s*$/) {
1633				ERROR("TEST: is attr\n" . $herecurr);
1634			} elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
1635				ERROR("TEST: is not attr ($1 is)\n". $herecurr);
1636			}
1637			next;
1638		}
1639
1640# check for initialisation to aggregates open brace on the next line
1641		if ($line =~ /^.\s*\{/ &&
1642		    $prevline =~ /(?:^|[^=])=\s*$/) {
1643			ERROR("that open brace { should be on the previous line\n" . $hereprev);
1644		}
1645
1646#
1647# Checks which are anchored on the added line.
1648#
1649
1650# check for malformed paths in #include statements (uses RAW line)
1651		if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
1652			my $path = $1;
1653			if ($path =~ m{//}) {
1654				ERROR("malformed #include filename\n" .
1655					$herecurr);
1656			}
1657		}
1658
1659# no C99 // comments
1660		if ($line =~ m{//}) {
1661			ERROR("do not use C99 // comments\n" . $herecurr);
1662		}
1663		# Remove C99 comments.
1664		$line =~ s@//.*@@;
1665		$opline =~ s@//.*@@;
1666
1667# check for global initialisers.
1668		if ($line =~ /^.$Type\s*$Ident\s*(?:\s+$Modifier)*\s*=\s*(0|NULL|false)\s*;/) {
1669			ERROR("do not initialise globals to 0 or NULL\n" .
1670				$herecurr);
1671		}
1672# check for static initialisers.
1673		if ($line =~ /\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
1674			ERROR("do not initialise statics to 0 or NULL\n" .
1675				$herecurr);
1676		}
1677
1678# * goes on variable not on type
1679		# (char*[ const])
1680		if ($line =~ m{\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\)}) {
1681			my ($from, $to) = ($1, $1);
1682
1683			# Should start with a space.
1684			$to =~ s/^(\S)/ $1/;
1685			# Should not end with a space.
1686			$to =~ s/\s+$//;
1687			# '*'s should not have spaces between.
1688			while ($to =~ s/\*\s+\*/\*\*/) {
1689			}
1690
1691			#print "from<$from> to<$to>\n";
1692			if ($from ne $to) {
1693				ERROR("\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr);
1694			}
1695		} elsif ($line =~ m{\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident)}) {
1696			my ($from, $to, $ident) = ($1, $1, $2);
1697
1698			# Should start with a space.
1699			$to =~ s/^(\S)/ $1/;
1700			# Should not end with a space.
1701			$to =~ s/\s+$//;
1702			# '*'s should not have spaces between.
1703			while ($to =~ s/\*\s+\*/\*\*/) {
1704			}
1705			# Modifiers should have spaces.
1706			$to =~ s/(\b$Modifier$)/$1 /;
1707
1708			#print "from<$from> to<$to> ident<$ident>\n";
1709			if ($from ne $to && $ident !~ /^$Modifier$/) {
1710				ERROR("\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr);
1711			}
1712		}
1713
1714# function brace can't be on same line, except for #defines of do while,
1715# or if closed on same line
1716		if (($line=~/$Type\s*$Ident\(.*\).*\s\{/) and
1717		    !($line=~/\#\s*define.*do\s\{/) and !($line=~/}/)) {
1718			ERROR("open brace '{' following function declarations go on the next line\n" . $herecurr);
1719		}
1720
1721# open braces for enum, union and struct go on the same line.
1722		if ($line =~ /^.\s*\{/ &&
1723		    $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
1724			ERROR("open brace '{' following $1 go on the same line\n" . $hereprev);
1725		}
1726
1727# missing space after union, struct or enum definition
1728		if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?(?:\s+$Ident)?[=\{]/) {
1729		    ERROR("missing space after $1 definition\n" . $herecurr);
1730		}
1731
1732# check for spacing round square brackets; allowed:
1733#  1. with a type on the left -- int [] a;
1734#  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
1735#  3. inside a curly brace -- = { [0...10] = 5 }
1736#  4. after a comma -- [1] = 5, [2] = 6
1737#  5. in a macro definition -- #define abc(x) [x] = y
1738		while ($line =~ /(.*?\s)\[/g) {
1739			my ($where, $prefix) = ($-[1], $1);
1740			if ($prefix !~ /$Type\s+$/ &&
1741			    ($where != 0 || $prefix !~ /^.\s+$/) &&
1742			    $prefix !~ /{\s+$/ &&
1743			    $prefix !~ /\#\s*define[^(]*\([^)]*\)\s+$/ &&
1744			    $prefix !~ /,\s+$/) {
1745				ERROR("space prohibited before open square bracket '['\n" . $herecurr);
1746			}
1747		}
1748
1749# check for spaces between functions and their parentheses.
1750		while ($line =~ /($Ident)\s+\(/g) {
1751			my $name = $1;
1752			my $ctx_before = substr($line, 0, $-[1]);
1753			my $ctx = "$ctx_before$name";
1754
1755			# Ignore those directives where spaces _are_ permitted.
1756			if ($name =~ /^(?:
1757				if|for|while|switch|return|case|
1758				volatile|__volatile__|coroutine_fn|
1759				__attribute__|format|__extension__|
1760				asm|__asm__)$/x)
1761			{
1762
1763			# Ignore 'catch (...)' in C++
1764			} elsif ($name =~ /^catch$/ && $realfile =~ /(\.cpp|\.h)$/) {
1765
1766			# cpp #define statements have non-optional spaces, ie
1767			# if there is a space between the name and the open
1768			# parenthesis it is simply not a parameter group.
1769			} elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
1770
1771			# cpp #elif statement condition may start with a (
1772			} elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
1773
1774			# If this whole things ends with a type its most
1775			# likely a typedef for a function.
1776			} elsif ($ctx =~ /$Type$/) {
1777
1778			} else {
1779				ERROR("space prohibited between function name and open parenthesis '('\n" . $herecurr);
1780			}
1781		}
1782# Check operator spacing.
1783		if (!($line=~/\#\s*include/)) {
1784			my $ops = qr{
1785				<<=|>>=|<=|>=|==|!=|
1786				\+=|-=|\*=|\/=|%=|\^=|\|=|&=|
1787				=>|->|<<|>>|<|>|=|!|~|
1788				&&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
1789				\?|::|:
1790			}x;
1791			my @elements = split(/($ops|;)/, $opline);
1792			my $off = 0;
1793
1794			my $blank = copy_spacing($opline);
1795
1796			for (my $n = 0; $n < $#elements; $n += 2) {
1797				$off += length($elements[$n]);
1798
1799				# Pick up the preceding and succeeding characters.
1800				my $ca = substr($opline, 0, $off);
1801				my $cc = '';
1802				if (length($opline) >= ($off + length($elements[$n + 1]))) {
1803					$cc = substr($opline, $off + length($elements[$n + 1]));
1804				}
1805				my $cb = "$ca$;$cc";
1806
1807				my $a = '';
1808				$a = 'V' if ($elements[$n] ne '');
1809				$a = 'W' if ($elements[$n] =~ /\s$/);
1810				$a = 'C' if ($elements[$n] =~ /$;$/);
1811				$a = 'B' if ($elements[$n] =~ /(\[|\()$/);
1812				$a = 'O' if ($elements[$n] eq '');
1813				$a = 'E' if ($ca =~ /^\s*$/);
1814
1815				my $op = $elements[$n + 1];
1816
1817				my $c = '';
1818				if (defined $elements[$n + 2]) {
1819					$c = 'V' if ($elements[$n + 2] ne '');
1820					$c = 'W' if ($elements[$n + 2] =~ /^\s/);
1821					$c = 'C' if ($elements[$n + 2] =~ /^$;/);
1822					$c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
1823					$c = 'O' if ($elements[$n + 2] eq '');
1824					$c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
1825				} else {
1826					$c = 'E';
1827				}
1828
1829				my $ctx = "${a}x${c}";
1830
1831				my $at = "(ctx:$ctx)";
1832
1833				my $ptr = substr($blank, 0, $off) . "^";
1834				my $hereptr = "$hereline$ptr\n";
1835
1836				# Pull out the value of this operator.
1837				my $op_type = substr($curr_values, $off + 1, 1);
1838
1839				# Get the full operator variant.
1840				my $opv = $op . substr($curr_vars, $off, 1);
1841
1842				# Ignore operators passed as parameters.
1843				if ($op_type ne 'V' &&
1844				    $ca =~ /\s$/ && $cc =~ /^\s*,/) {
1845
1846#				# Ignore comments
1847#				} elsif ($op =~ /^$;+$/) {
1848
1849				# ; should have either the end of line or a space or \ after it
1850				} elsif ($op eq ';') {
1851					if ($ctx !~ /.x[WEBC]/ &&
1852					    $cc !~ /^\\/ && $cc !~ /^;/) {
1853						ERROR("space required after that '$op' $at\n" . $hereptr);
1854					}
1855
1856				# // is a comment
1857				} elsif ($op eq '//') {
1858
1859				# Ignore : used in class declaration in C++
1860				} elsif ($opv eq ':B' && $ctx =~ /Wx[WE]/ &&
1861						 $line =~ /class/ && $realfile =~ /(\.cpp|\.h)$/) {
1862
1863				# No spaces for:
1864				#   ->
1865				#   :   when part of a bitfield
1866				} elsif ($op eq '->' || $opv eq ':B') {
1867					if ($ctx =~ /Wx.|.xW/) {
1868						ERROR("spaces prohibited around that '$op' $at\n" . $hereptr);
1869					}
1870
1871				# , must have a space on the right.
1872                                # not required when having a single },{ on one line
1873				} elsif ($op eq ',') {
1874					if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/ &&
1875                                            ($elements[$n] . $elements[$n + 2]) !~ " *}\\{") {
1876						ERROR("space required after that '$op' $at\n" . $hereptr);
1877					}
1878
1879				# '*' as part of a type definition -- reported already.
1880				} elsif ($opv eq '*_') {
1881					#warn "'*' is part of type\n";
1882
1883				# unary operators should have a space before and
1884				# none after.  May be left adjacent to another
1885				# unary operator, or a cast
1886				} elsif ($op eq '!' || $op eq '~' ||
1887					 $opv eq '*U' || $opv eq '-U' ||
1888					 $opv eq '&U' || $opv eq '&&U') {
1889					if ($op eq '~' && $ca =~ /::$/ && $realfile =~ /(\.cpp|\.h)$/) {
1890						# '~' used as a name of Destructor
1891
1892					} elsif ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
1893						ERROR("space required before that '$op' $at\n" . $hereptr);
1894					}
1895					if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
1896						# A unary '*' may be const
1897
1898					} elsif ($ctx =~ /.xW/) {
1899						ERROR("space prohibited after that '$op' $at\n" . $hereptr);
1900					}
1901
1902				# unary ++ and unary -- are allowed no space on one side.
1903				} elsif ($op eq '++' or $op eq '--') {
1904					if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
1905						ERROR("space required one side of that '$op' $at\n" . $hereptr);
1906					}
1907					if ($ctx =~ /Wx[BE]/ ||
1908					    ($ctx =~ /Wx./ && $cc =~ /^;/)) {
1909						ERROR("space prohibited before that '$op' $at\n" . $hereptr);
1910					}
1911					if ($ctx =~ /ExW/) {
1912						ERROR("space prohibited after that '$op' $at\n" . $hereptr);
1913					}
1914
1915				# A colon needs no spaces before when it is
1916				# terminating a case value or a label.
1917				} elsif ($opv eq ':C' || $opv eq ':L') {
1918					if ($ctx =~ /Wx./) {
1919						ERROR("space prohibited before that '$op' $at\n" . $hereptr);
1920					}
1921
1922				# All the others need spaces both sides.
1923				} elsif ($ctx !~ /[EWC]x[CWE]/) {
1924					my $ok = 0;
1925
1926					if ($realfile =~ /\.cpp|\.h$/) {
1927						# Ignore template arguments <...> in C++
1928						if (($op eq '<' || $op eq '>') && $line =~ /<.*>/) {
1929							$ok = 1;
1930						}
1931
1932						# Ignore :: in C++
1933						if ($op eq '::') {
1934							$ok = 1;
1935						}
1936					}
1937
1938					# Ignore email addresses <foo@bar>
1939					if (($op eq '<' &&
1940					     $cc =~ /^\S+\@\S+>/) ||
1941					    ($op eq '>' &&
1942					     $ca =~ /<\S+\@\S+$/))
1943					{
1944						$ok = 1;
1945					}
1946
1947					# Ignore ?:
1948					if (($opv eq ':O' && $ca =~ /\?$/) ||
1949					    ($op eq '?' && $cc =~ /^:/)) {
1950						$ok = 1;
1951					}
1952
1953					if ($ok == 0) {
1954						ERROR("spaces required around that '$op' $at\n" . $hereptr);
1955					}
1956				}
1957				$off += length($elements[$n + 1]);
1958			}
1959		}
1960
1961#need space before brace following if, while, etc
1962		if (($line =~ /\(.*\)\{/ && $line !~ /\($Type\)\{/) ||
1963		    $line =~ /do\{/) {
1964			ERROR("space required before the open brace '{'\n" . $herecurr);
1965		}
1966
1967# closing brace should have a space following it when it has anything
1968# on the line
1969		if ($line =~ /}(?!(?:,|;|\)))\S/) {
1970			ERROR("space required after that close brace '}'\n" . $herecurr);
1971		}
1972
1973# check spacing on square brackets
1974		if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
1975			ERROR("space prohibited after that open square bracket '['\n" . $herecurr);
1976		}
1977		if ($line =~ /\s\]/) {
1978			ERROR("space prohibited before that close square bracket ']'\n" . $herecurr);
1979		}
1980
1981# check spacing on parentheses
1982		if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
1983		    $line !~ /for\s*\(\s+;/) {
1984			ERROR("space prohibited after that open parenthesis '('\n" . $herecurr);
1985		}
1986		if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
1987		    $line !~ /for\s*\(.*;\s+\)/ &&
1988		    $line !~ /:\s+\)/) {
1989			ERROR("space prohibited before that close parenthesis ')'\n" . $herecurr);
1990		}
1991
1992# Return is not a function.
1993		if (defined($stat) && $stat =~ /^.\s*return(\s*)(\(.*);/s) {
1994			my $spacing = $1;
1995			my $value = $2;
1996
1997			# Flatten any parentheses
1998			$value =~ s/\(/ \(/g;
1999			$value =~ s/\)/\) /g;
2000			while ($value =~ s/\[[^\{\}]*\]/1/ ||
2001			       $value !~ /(?:$Ident|-?$Constant)\s*
2002					     $Compare\s*
2003					     (?:$Ident|-?$Constant)/x &&
2004			       $value =~ s/\([^\(\)]*\)/1/) {
2005			}
2006#print "value<$value>\n";
2007			if ($value =~ /^\s*(?:$Ident|-?$Constant)\s*$/) {
2008				ERROR("return is not a function, parentheses are not required\n" . $herecurr);
2009
2010			} elsif ($spacing !~ /\s+/) {
2011				ERROR("space required before the open parenthesis '('\n" . $herecurr);
2012			}
2013		}
2014# Return of what appears to be an errno should normally be -'ve
2015		if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
2016			my $name = $1;
2017			if ($name ne 'EOF' && $name ne 'ERROR') {
2018				ERROR("return of an errno should typically be -ve (return -$1)\n" . $herecurr);
2019			}
2020		}
2021
2022# Need a space before open parenthesis after if, while etc
2023		if ($line=~/\b(if|while|for|switch)\(/) {
2024			ERROR("space required before the open parenthesis '('\n" . $herecurr);
2025		}
2026
2027# Check for illegal assignment in if conditional -- and check for trailing
2028# statements after the conditional.
2029		if ($line =~ /do\s*(?!{)/) {
2030			my ($stat_next) = ctx_statement_block($line_nr_next,
2031						$remain_next, $off_next);
2032			$stat_next =~ s/\n./\n /g;
2033			##print "stat<$stat> stat_next<$stat_next>\n";
2034
2035			if ($stat_next =~ /^\s*while\b/) {
2036				# If the statement carries leading newlines,
2037				# then count those as offsets.
2038				my ($whitespace) =
2039					($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
2040				my $offset =
2041					statement_rawlines($whitespace) - 1;
2042
2043				$suppress_whiletrailers{$line_nr_next +
2044								$offset} = 1;
2045			}
2046		}
2047		if (!defined $suppress_whiletrailers{$linenr} &&
2048		    $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
2049			my ($s, $c) = ($stat, $cond);
2050
2051			if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
2052				ERROR("do not use assignment in if condition\n" . $herecurr);
2053			}
2054
2055			# Find out what is on the end of the line after the
2056			# conditional.
2057			substr($s, 0, length($c), '');
2058			$s =~ s/\n.*//g;
2059			$s =~ s/$;//g; 	# Remove any comments
2060			if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
2061			    $c !~ /}\s*while\s*/)
2062			{
2063				# Find out how long the conditional actually is.
2064				my @newlines = ($c =~ /\n/gs);
2065				my $cond_lines = 1 + $#newlines;
2066				my $stat_real = '';
2067
2068				$stat_real = raw_line($linenr, $cond_lines)
2069							. "\n" if ($cond_lines);
2070				if (defined($stat_real) && $cond_lines > 1) {
2071					$stat_real = "[...]\n$stat_real";
2072				}
2073
2074				ERROR("trailing statements should be on next line\n" . $herecurr . $stat_real);
2075			}
2076		}
2077
2078# Check for bitwise tests written as boolean
2079		if ($line =~ /
2080			(?:
2081				(?:\[|\(|\&\&|\|\|)
2082				\s*0[xX][0-9]+\s*
2083				(?:\&\&|\|\|)
2084			|
2085				(?:\&\&|\|\|)
2086				\s*0[xX][0-9]+\s*
2087				(?:\&\&|\|\||\)|\])
2088			)/x)
2089		{
2090			ERROR("boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
2091		}
2092
2093# if and else should not have general statements after it
2094		if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
2095			my $s = $1;
2096			$s =~ s/$;//g; 	# Remove any comments
2097			if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
2098				ERROR("trailing statements should be on next line\n" . $herecurr);
2099			}
2100		}
2101# if should not continue a brace
2102		if ($line =~ /}\s*if\b/) {
2103			ERROR("trailing statements should be on next line\n" .
2104				$herecurr);
2105		}
2106# case and default should not have general statements after them
2107		if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
2108		    $line !~ /\G(?:
2109			(?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
2110			\s*return\s+
2111		    )/xg)
2112		{
2113			ERROR("trailing statements should be on next line\n" . $herecurr);
2114		}
2115
2116		# Check for }<nl>else {, these must be at the same
2117		# indent level to be relevant to each other.
2118		if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
2119						$previndent == $indent) {
2120			ERROR("else should follow close brace '}'\n" . $hereprev);
2121		}
2122
2123		if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and
2124						$previndent == $indent) {
2125			my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
2126
2127			# Find out what is on the end of the line after the
2128			# conditional.
2129			substr($s, 0, length($c), '');
2130			$s =~ s/\n.*//g;
2131
2132			if ($s =~ /^\s*;/) {
2133				ERROR("while should follow close brace '}'\n" . $hereprev);
2134			}
2135		}
2136
2137#studly caps, commented out until figure out how to distinguish between use of existing and adding new
2138#		if (($line=~/[\w_][a-z\d]+[A-Z]/) and !($line=~/print/)) {
2139#		    print "No studly caps, use _\n";
2140#		    print "$herecurr";
2141#		    $clean = 0;
2142#		}
2143
2144#no spaces allowed after \ in define
2145		if ($line=~/\#\s*define.*\\\s$/) {
2146			ERROR("Whitespace after \\ makes next lines useless\n" . $herecurr);
2147		}
2148
2149# multi-statement macros should be enclosed in a do while loop, grab the
2150# first statement and ensure its the whole macro if its not enclosed
2151# in a known good container
2152		if ($realfile !~ m@/vmlinux.lds.h$@ &&
2153		    $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
2154			my $ln = $linenr;
2155			my $cnt = $realcnt;
2156			my ($off, $dstat, $dcond, $rest);
2157			my $ctx = '';
2158
2159			my $args = defined($1);
2160
2161			# Find the end of the macro and limit our statement
2162			# search to that.
2163			while ($cnt > 0 && defined $lines[$ln - 1] &&
2164				$lines[$ln - 1] =~ /^(?:-|..*\\$)/)
2165			{
2166				$ctx .= $rawlines[$ln - 1] . "\n";
2167				$cnt-- if ($lines[$ln - 1] !~ /^-/);
2168				$ln++;
2169			}
2170			$ctx .= $rawlines[$ln - 1];
2171
2172			($dstat, $dcond, $ln, $cnt, $off) =
2173				ctx_statement_block($linenr, $ln - $linenr + 1, 0);
2174			#print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
2175			#print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
2176
2177			# Extract the remainder of the define (if any) and
2178			# rip off surrounding spaces, and trailing \'s.
2179			$rest = '';
2180			while ($off != 0 || ($cnt > 0 && $rest =~ /\\\s*$/)) {
2181				#print "ADDING cnt<$cnt> $off <" . substr($lines[$ln - 1], $off) . "> rest<$rest>\n";
2182				if ($off != 0 || $lines[$ln - 1] !~ /^-/) {
2183					$rest .= substr($lines[$ln - 1], $off) . "\n";
2184					$cnt--;
2185				}
2186				$ln++;
2187				$off = 0;
2188			}
2189			$rest =~ s/\\\n.//g;
2190			$rest =~ s/^\s*//s;
2191			$rest =~ s/\s*$//s;
2192
2193			# Clean up the original statement.
2194			if ($args) {
2195				substr($dstat, 0, length($dcond), '');
2196			} else {
2197				$dstat =~ s/^.\s*\#\s*define\s+$Ident\s*//;
2198			}
2199			$dstat =~ s/$;//g;
2200			$dstat =~ s/\\\n.//g;
2201			$dstat =~ s/^\s*//s;
2202			$dstat =~ s/\s*$//s;
2203
2204			# Flatten any parentheses and braces
2205			while ($dstat =~ s/\([^\(\)]*\)/1/ ||
2206			       $dstat =~ s/\{[^\{\}]*\}/1/ ||
2207			       $dstat =~ s/\[[^\{\}]*\]/1/)
2208			{
2209			}
2210
2211			my $exceptions = qr{
2212				$Declare|
2213				module_param_named|
2214				MODULE_PARAM_DESC|
2215				DECLARE_PER_CPU|
2216				DEFINE_PER_CPU|
2217				__typeof__\(|
2218				union|
2219				struct|
2220				\.$Ident\s*=\s*|
2221				^\"|\"$
2222			}x;
2223			#print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
2224			if ($rest ne '' && $rest ne ',') {
2225				if ($rest !~ /while\s*\(/ &&
2226				    $dstat !~ /$exceptions/)
2227				{
2228					ERROR("Macros with multiple statements should be enclosed in a do - while loop\n" . "$here\n$ctx\n");
2229				}
2230
2231			} elsif ($ctx !~ /;/) {
2232				if ($dstat ne '' &&
2233				    $dstat !~ /^(?:$Ident|-?$Constant)$/ &&
2234				    $dstat !~ /$exceptions/ &&
2235				    $dstat !~ /^\.$Ident\s*=/ &&
2236				    $dstat =~ /$Operators/)
2237				{
2238					ERROR("Macros with complex values should be enclosed in parenthesis\n" . "$here\n$ctx\n");
2239				}
2240			}
2241		}
2242
2243# check for missing bracing round if etc
2244		if ($line =~ /(^.*)\bif\b/ && $line !~ /\#\s*if/) {
2245			my ($level, $endln, @chunks) =
2246				ctx_statement_full($linenr, $realcnt, 1);
2247                        if ($dbg_adv_apw) {
2248                            print "APW: chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
2249                            print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n"
2250                                if $#chunks >= 1;
2251                        }
2252			if ($#chunks >= 0 && $level == 0) {
2253				my $allowed = 0;
2254				my $seen = 0;
2255				my $herectx = $here . "\n";
2256				my $ln = $linenr - 1;
2257				for my $chunk (@chunks) {
2258					my ($cond, $block) = @{$chunk};
2259
2260					# If the condition carries leading newlines, then count those as offsets.
2261					my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
2262					my $offset = statement_rawlines($whitespace) - 1;
2263
2264					#print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
2265
2266					# We have looked at and allowed this specific line.
2267					$suppress_ifbraces{$ln + $offset} = 1;
2268
2269					$herectx .= "$rawlines[$ln + $offset]\n[...]\n";
2270					$ln += statement_rawlines($block) - 1;
2271
2272					substr($block, 0, length($cond), '');
2273
2274					my $spaced_block = $block;
2275					$spaced_block =~ s/\n\+/ /g;
2276
2277					$seen++ if ($spaced_block =~ /^\s*\{/);
2278
2279                                        print "APW: cond<$cond> block<$block> allowed<$allowed>\n"
2280                                            if $dbg_adv_apw;
2281					if (statement_lines($cond) > 1) {
2282                                            print "APW: ALLOWED: cond<$cond>\n"
2283                                                if $dbg_adv_apw;
2284                                            $allowed = 1;
2285					}
2286					if ($block =~/\b(?:if|for|while)\b/) {
2287                                            print "APW: ALLOWED: block<$block>\n"
2288                                                if $dbg_adv_apw;
2289                                            $allowed = 1;
2290					}
2291					if (statement_block_size($block) > 1) {
2292                                            print "APW: ALLOWED: lines block<$block>\n"
2293                                                if $dbg_adv_apw;
2294                                            $allowed = 1;
2295					}
2296				}
2297				if ($seen != ($#chunks + 1)) {
2298					ERROR("braces {} are necessary for all arms of this statement\n" . $herectx);
2299				}
2300			}
2301		}
2302		if (!defined $suppress_ifbraces{$linenr - 1} &&
2303					$line =~ /\b(if|while|for|else)\b/ &&
2304					$line !~ /\#\s*if/ &&
2305					$line !~ /\#\s*else/) {
2306			my $allowed = 0;
2307
2308                        # Check the pre-context.
2309                        if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
2310                            my $pre = $1;
2311
2312                            if ($line !~ /else/) {
2313                                print "APW: ALLOWED: pre<$pre> line<$line>\n"
2314                                    if $dbg_adv_apw;
2315                                $allowed = 1;
2316                            }
2317                        }
2318
2319			my ($level, $endln, @chunks) =
2320				ctx_statement_full($linenr, $realcnt, $-[0]);
2321
2322			# Check the condition.
2323			my ($cond, $block) = @{$chunks[0]};
2324                        print "CHECKING<$linenr> cond<$cond> block<$block>\n"
2325                            if $dbg_adv_checking;
2326			if (defined $cond) {
2327				substr($block, 0, length($cond), '');
2328			}
2329			if (statement_lines($cond) > 1) {
2330                            print "APW: ALLOWED: cond<$cond>\n"
2331                                if $dbg_adv_apw;
2332                            $allowed = 1;
2333			}
2334			if ($block =~/\b(?:if|for|while)\b/) {
2335                            print "APW: ALLOWED: block<$block>\n"
2336                                if $dbg_adv_apw;
2337                            $allowed = 1;
2338			}
2339			if (statement_block_size($block) > 1) {
2340                            print "APW: ALLOWED: lines block<$block>\n"
2341                                if $dbg_adv_apw;
2342                            $allowed = 1;
2343			}
2344			# Check the post-context.
2345			if (defined $chunks[1]) {
2346				my ($cond, $block) = @{$chunks[1]};
2347				if (defined $cond) {
2348					substr($block, 0, length($cond), '');
2349				}
2350				if ($block =~ /^\s*\{/) {
2351                                    print "APW: ALLOWED: chunk-1 block<$block>\n"
2352                                        if $dbg_adv_apw;
2353                                    $allowed = 1;
2354				}
2355			}
2356                        print "DCS: level=$level block<$block> allowed=$allowed\n"
2357                            if $dbg_adv_dcs;
2358			if ($level == 0 && $block !~ /^\s*\{/ && !$allowed) {
2359				my $herectx = $here . "\n";;
2360				my $cnt = statement_rawlines($block);
2361
2362				for (my $n = 0; $n < $cnt; $n++) {
2363					$herectx .= raw_line($linenr, $n) . "\n";;
2364				}
2365
2366				ERROR("braces {} are necessary even for single statement blocks\n" . $herectx);
2367			}
2368		}
2369
2370# no volatiles please
2371		my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
2372		if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
2373			ERROR("Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
2374		}
2375
2376# warn about #if 0
2377		if ($line =~ /^.\s*\#\s*if\s+0\b/) {
2378			ERROR("if this code is redundant consider removing it\n" .
2379				$herecurr);
2380		}
2381
2382# check for needless g_free() checks
2383		if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
2384			my $expr = $1;
2385			if ($line =~ /\bg_free\(\Q$expr\E\);/) {
2386				ERROR("g_free(NULL) is safe this check is probably not required\n" . $hereprev);
2387			}
2388		}
2389
2390# warn about #ifdefs in C files
2391#		if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
2392#			print "#ifdef in C files should be avoided\n";
2393#			print "$herecurr";
2394#			$clean = 0;
2395#		}
2396
2397# warn about spacing in #ifdefs
2398		if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
2399			ERROR("exactly one space required after that #$1\n" . $herecurr);
2400		}
2401# check for memory barriers without a comment.
2402		if ($line =~ /\b(smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
2403			if (!ctx_has_comment($first_line, $linenr)) {
2404				ERROR("memory barrier without comment\n" . $herecurr);
2405			}
2406		}
2407# check of hardware specific defines
2408# we have e.g. CONFIG_LINUX and CONFIG_WIN32 for common cases
2409# where they might be necessary.
2410		if ($line =~ m@^.\s*\#\s*if.*\b__@) {
2411			WARN("architecture specific defines should be avoided\n" .  $herecurr);
2412		}
2413
2414# Check that the storage class is at the beginning of a declaration
2415		if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
2416			ERROR("storage class should be at the beginning of the declaration\n" . $herecurr)
2417		}
2418
2419# check the location of the inline attribute, that it is between
2420# storage class and type.
2421		if ($line =~ /\b$Type\s+$Inline\b/ ||
2422		    $line =~ /\b$Inline\s+$Storage\b/) {
2423			ERROR("inline keyword should sit between storage class and type\n" . $herecurr);
2424		}
2425
2426# check for sizeof(&)
2427		if ($line =~ /\bsizeof\s*\(\s*\&/) {
2428			ERROR("sizeof(& should be avoided\n" . $herecurr);
2429		}
2430
2431# check for new externs in .c files.
2432		if ($realfile =~ /\.c$/ && defined $stat &&
2433		    $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
2434		{
2435			my $function_name = $1;
2436			my $paren_space = $2;
2437
2438			my $s = $stat;
2439			if (defined $cond) {
2440				substr($s, 0, length($cond), '');
2441			}
2442			if ($s =~ /^\s*;/ &&
2443			    $function_name ne 'uninitialized_var')
2444			{
2445				ERROR("externs should be avoided in .c files\n" .  $herecurr);
2446			}
2447
2448			if ($paren_space =~ /\n/) {
2449				ERROR("arguments for function declarations should follow identifier\n" . $herecurr);
2450			}
2451
2452		} elsif ($realfile =~ /\.c$/ && defined $stat &&
2453		    $stat =~ /^.\s*extern\s+/)
2454		{
2455			ERROR("externs should be avoided in .c files\n" .  $herecurr);
2456		}
2457
2458# check for pointless casting of g_malloc return
2459		if ($line =~ /\*\s*\)\s*g_(try)?(m|re)alloc(0?)(_n)?\b/) {
2460			if ($2 == 'm') {
2461				ERROR("unnecessary cast may hide bugs, use g_$1new$3 instead\n" . $herecurr);
2462			} else {
2463				ERROR("unnecessary cast may hide bugs, use g_$1renew$3 instead\n" . $herecurr);
2464			}
2465		}
2466
2467# check for gcc specific __FUNCTION__
2468		if ($line =~ /__FUNCTION__/) {
2469			ERROR("__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr);
2470		}
2471
2472# recommend qemu_strto* over strto* for numeric conversions
2473		if ($line =~ /\b(strto[^kd].*?)\s*\(/) {
2474			ERROR("consider using qemu_$1 in preference to $1\n" . $herecurr);
2475		}
2476# recommend sigaction over signal for portability, when establishing a handler
2477		if ($line =~ /\bsignal\s*\(/ && !($line =~ /SIG_(?:IGN|DFL)/)) {
2478			ERROR("use sigaction to establish signal handlers; signal is not portable\n" . $herecurr);
2479		}
2480# check for module_init(), use category-specific init macros explicitly please
2481		if ($line =~ /^module_init\s*\(/) {
2482			ERROR("please use block_init(), type_init() etc. instead of module_init()\n" . $herecurr);
2483		}
2484# check for various ops structs, ensure they are const.
2485		my $struct_ops = qr{AIOCBInfo|
2486				BdrvActionOps|
2487				BlockDevOps|
2488				BlockJobDriver|
2489				DisplayChangeListenerOps|
2490				GraphicHwOps|
2491				IDEDMAOps|
2492				KVMCapabilityInfo|
2493				MemoryRegionIOMMUOps|
2494				MemoryRegionOps|
2495				MemoryRegionPortio|
2496				QEMUFileOps|
2497				SCSIBusInfo|
2498				SCSIReqOps|
2499				Spice[A-Z][a-zA-Z0-9]*Interface|
2500				TPMDriverOps|
2501				USBDesc[A-Z][a-zA-Z0-9]*|
2502				VhostOps|
2503				VMStateDescription|
2504				VMStateInfo}x;
2505		if ($line !~ /\bconst\b/ &&
2506		    $line =~ /\b($struct_ops)\b.*=/) {
2507			ERROR("initializer for struct $1 should normally be const\n" .
2508				$herecurr);
2509		}
2510
2511# check for %L{u,d,i} in strings
2512		my $string;
2513		while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
2514			$string = substr($rawline, $-[1], $+[1] - $-[1]);
2515			$string =~ s/%%/__/g;
2516			if ($string =~ /(?<!%)%L[udi]/) {
2517				ERROR("\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
2518				last;
2519			}
2520		}
2521
2522# QEMU specific tests
2523		if ($rawline =~ /\b(?:Qemu|QEmu)\b/) {
2524			ERROR("use QEMU instead of Qemu or QEmu\n" . $herecurr);
2525		}
2526
2527# Qemu error function tests
2528
2529	# Find newlines in error messages
2530	my $qemu_error_funcs = qr{error_setg|
2531				error_setg_errno|
2532				error_setg_win32|
2533				error_setg_file_open|
2534				error_set|
2535				error_prepend|
2536				warn_reportf_err|
2537				error_reportf_err|
2538				error_vreport|
2539				warn_vreport|
2540				info_vreport|
2541				error_report|
2542				warn_report|
2543				info_report}x;
2544
2545	if ($rawline =~ /\b(?:$qemu_error_funcs)\s*\(.*\".*\\n/) {
2546		ERROR("Error messages should not contain newlines\n" . $herecurr);
2547	}
2548
2549	# Continue checking for error messages that contains newlines. This
2550	# check handles cases where string literals are spread over multiple lines.
2551	# Example:
2552	# error_report("Error msg line #1"
2553	#              "Error msg line #2\n");
2554	my $quoted_newline_regex = qr{\+\s*\".*\\n.*\"};
2555	my $continued_str_literal = qr{\+\s*\".*\"};
2556
2557	if ($rawline =~ /$quoted_newline_regex/) {
2558		# Backtrack to first line that does not contain only a quoted literal
2559		# and assume that it is the start of the statement.
2560		my $i = $linenr - 2;
2561
2562		while (($i >= 0) & $rawlines[$i] =~ /$continued_str_literal/) {
2563			$i--;
2564		}
2565
2566		if ($rawlines[$i] =~ /\b(?:$qemu_error_funcs)\s*\(/) {
2567			ERROR("Error messages should not contain newlines\n" . $herecurr);
2568		}
2569	}
2570
2571# check for non-portable libc calls that have portable alternatives in QEMU
2572		if ($line =~ /\bffs\(/) {
2573			ERROR("use ctz32() instead of ffs()\n" . $herecurr);
2574		}
2575		if ($line =~ /\bffsl\(/) {
2576			ERROR("use ctz32() or ctz64() instead of ffsl()\n" . $herecurr);
2577		}
2578		if ($line =~ /\bffsll\(/) {
2579			ERROR("use ctz64() instead of ffsll()\n" . $herecurr);
2580		}
2581		if ($line =~ /\bbzero\(/) {
2582			ERROR("use memset() instead of bzero()\n" . $herecurr);
2583		}
2584		my $non_exit_glib_asserts = qr{g_assert_cmpstr|
2585						g_assert_cmpint|
2586						g_assert_cmpuint|
2587						g_assert_cmphex|
2588						g_assert_cmpfloat|
2589						g_assert_true|
2590						g_assert_false|
2591						g_assert_nonnull|
2592						g_assert_null|
2593						g_assert_no_error|
2594						g_assert_error|
2595						g_test_assert_expected_messages|
2596						g_test_trap_assert_passed|
2597						g_test_trap_assert_stdout|
2598						g_test_trap_assert_stdout_unmatched|
2599						g_test_trap_assert_stderr|
2600						g_test_trap_assert_stderr_unmatched}x;
2601		if ($realfile !~ /^tests\// &&
2602			$line =~ /\b(?:$non_exit_glib_asserts)\(/) {
2603			ERROR("Use g_assert or g_assert_not_reached\n". $herecurr);
2604		}
2605	}
2606
2607	# If we have no input at all, then there is nothing to report on
2608	# so just keep quiet.
2609	if ($#rawlines == -1) {
2610		exit(0);
2611	}
2612
2613	# In mailback mode only produce a report in the negative, for
2614	# things that appear to be patches.
2615	if ($mailback && ($clean == 1 || !$is_patch)) {
2616		exit(0);
2617	}
2618
2619	# This is not a patch, and we are are in 'no-patch' mode so
2620	# just keep quiet.
2621	if (!$chk_patch && !$is_patch) {
2622		exit(0);
2623	}
2624
2625	if (!$is_patch) {
2626		ERROR("Does not appear to be a unified-diff format patch\n");
2627	}
2628	if ($is_patch && $chk_signoff && $signoff == 0) {
2629		ERROR("Missing Signed-off-by: line(s)\n");
2630	}
2631
2632	print report_dump();
2633	if ($summary && !($clean == 1 && $quiet == 1)) {
2634		print "$filename " if ($summary_file);
2635		print "total: $cnt_error errors, $cnt_warn warnings, " .
2636			"$cnt_lines lines checked\n";
2637		print "\n" if ($quiet == 0);
2638	}
2639
2640	if ($quiet == 0) {
2641		# If there were whitespace errors which cleanpatch can fix
2642		# then suggest that.
2643#		if ($rpt_cleaners) {
2644#			print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
2645#			print "      scripts/cleanfile\n\n";
2646#		}
2647	}
2648
2649	if ($clean == 1 && $quiet == 0) {
2650		print "$vname has no obvious style problems and is ready for submission.\n"
2651	}
2652	if ($clean == 0 && $quiet == 0) {
2653		print "$vname has style problems, please review.  If any of these errors\n";
2654		print "are false positives report them to the maintainer, see\n";
2655		print "CHECKPATCH in MAINTAINERS.\n";
2656	}
2657
2658	return ($no_warnings ? $clean : $cnt_error == 0);
2659}
2660