scripts/checkpatch.pl

   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
   8 use strict;
   9 use warnings;
  10 use Term::ANSIColor qw(:constants);
  11
  12 my $P = $0;
  13 $P =~ s@.*/@@g;
  14
  15 our $SrcFile    = qr{\.(?:h|c|cpp|s|S|pl|py|sh)$};
  16
  17 my $V = '0.31';
  18
  19 use Getopt::Long qw(:config no_auto_abbrev);
  20
  21 my $quiet = 0;
  22 my $tree = 1;
  23 my $chk_signoff = 1;
  24 my $chk_patch = undef;
  25 my $chk_branch = undef;
  26 my $tst_only;
  27 my $emacs = 0;
  28 my $terse = 0;
  29 my $file = undef;
  30 my $color = "auto";
  31 my $no_warnings = 0;
  32 my $summary = 1;
  33 my $mailback = 0;
  34 my $summary_file = 0;
  35 my $root;
  36 my %debug;
  37 my $help = 0;
  38
  39 sub help {
  40         my ($exitcode) = @_;
  41
  42         print << "EOM";
  43 Usage:
  44
  45     $P [OPTION]... [FILE]...
  46     $P [OPTION]... [GIT-REV-LIST]
  47
  48 Version: $V
  49
  50 Options:
  51   -q, --quiet                quiet
  52   --no-tree                  run without a kernel tree
  53   --no-signoff               do not check for 'Signed-off-by' line
  54   --patch                    treat FILE as patchfile
  55   --branch                   treat args as GIT revision list
  56   --emacs                    emacs compile window format
  57   --terse                    one line per report
  58   -f, --file                 treat FILE as regular source file
  59   --strict                   fail if only warnings are found
  60   --root=PATH                PATH to the kernel tree root
  61   --no-summary               suppress the per-file summary
  62   --mailback                 only produce a report in case of warnings/errors
  63   --summary-file             include the filename in summary
  64   --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
  65                              'values', 'possible', 'type', and 'attr' (default
  66                              is all off)
  67   --test-only=WORD           report only warnings/errors containing WORD
  68                              literally
  69   --color[=WHEN]             Use colors 'always', 'never', or only when output
  70                              is a terminal ('auto'). Default is 'auto'.
  71   -h, --help, --version      display this help and exit
  72
  73 When FILE is - read standard input.
  74 EOM
  75
  76         exit($exitcode);
  77 }
  78
  79 # Perl's Getopt::Long allows options to take optional arguments after a space.
  80 # Prevent --color by itself from consuming other arguments
  81 foreach (@ARGV) {
  82         if ($_ eq "--color" || $_ eq "-color") {
  83                 $_ = "--color=$color";
  84         }
  85 }
  86
  87 GetOptions(
  88         'q|quiet+'      => \$quiet,
  89         'tree!'         => \$tree,
  90         'signoff!'      => \$chk_signoff,
  91         'patch!'        => \$chk_patch,
  92         'branch!'       => \$chk_branch,
  93         'emacs!'        => \$emacs,
  94         'terse!'        => \$terse,
  95         'f|file!'       => \$file,
  96         'strict!'       => \$no_warnings,
  97         'root=s'        => \$root,
  98         'summary!'      => \$summary,
  99         'mailback!'     => \$mailback,
 100         'summary-file!' => \$summary_file,
 101
 102         'debug=s'       => \%debug,
 103         'test-only=s'   => \$tst_only,
 104         'color=s'       => \$color,
 105         'no-color'      => sub { $color = 'never'; },
 106         'h|help'        => \$help,
 107         'version'       => \$help
 108 ) or help(1);
 109
 110 help(0) if ($help);
 111
 112 my $exit = 0;
 113
 114 if ($#ARGV < 0) {
 115         print "$P: no input files\n";
 116         exit(1);
 117 }
 118
 119 if (!defined $chk_branch && !defined $chk_patch && !defined $file) {
 120         $chk_branch = $ARGV[0] =~ /.\.\./ ? 1 : 0;
 121         $file = $ARGV[0] =~ /$SrcFile/ ? 1 : 0;
 122         $chk_patch = $chk_branch || $file ? 0 : 1;
 123 } elsif (!defined $chk_branch && !defined $chk_patch) {
 124         if ($file) {
 125                 $chk_branch = $chk_patch = 0;
 126         } else {
 127                 $chk_branch = $ARGV[0] =~ /.\.\./ ? 1 : 0;
 128                 $chk_patch = $chk_branch ? 0 : 1;
 129         }
 130 } elsif (!defined $chk_branch && !defined $file) {
 131         if ($chk_patch) {
 132                 $chk_branch = $file = 0;
 133         } else {
 134                 $chk_branch = $ARGV[0] =~ /.\.\./ ? 1 : 0;
 135                 $file = $chk_branch ? 0 : 1;
 136         }
 137 } elsif (!defined $chk_patch && !defined $file) {
 138         if ($chk_branch) {
 139                 $chk_patch = $file = 0;
 140         } else {
 141                 $file = $ARGV[0] =~ /$SrcFile/ ? 1 : 0;
 142                 $chk_patch = $file ? 0 : 1;
 143         }
 144 } elsif (!defined $chk_branch) {
 145         $chk_branch = $chk_patch || $file ? 0 : 1;
 146 } elsif (!defined $chk_patch) {
 147         $chk_patch = $chk_branch || $file ? 0 : 1;
 148 } elsif (!defined $file) {
 149         $file = $chk_patch || $chk_branch ? 0 : 1;
 150 }
 151
 152 if (($chk_patch && $chk_branch) ||
 153     ($chk_patch && $file) ||
 154     ($chk_branch && $file)) {
 155         die "Only one of --file, --branch, --patch is permitted\n";
 156 }
 157 if (!$chk_patch && !$chk_branch && !$file) {
 158         die "One of --file, --branch, --patch is required\n";
 159 }
 160
 161 if ($color =~ /^always$/i) {
 162         $color = 1;
 163 } elsif ($color =~ /^never$/i) {
 164         $color = 0;
 165 } elsif ($color =~ /^auto$/i) {
 166         $color = (-t STDOUT);
 167 } else {
 168         die "Invalid color mode: $color\n";
 169 }
 170
 171 my $dbg_values = 0;
 172 my $dbg_possible = 0;
 173 my $dbg_type = 0;
 174 my $dbg_attr = 0;
 175 my $dbg_adv_dcs = 0;
 176 my $dbg_adv_checking = 0;
 177 my $dbg_adv_apw = 0;
 178 for my $key (keys %debug) {
 179         ## no critic
 180         eval "\${dbg_$key} = '$debug{$key}';";
 181         die "$@" if ($@);
 182 }
 183
 184 my $rpt_cleaners = 0;
 185
 186 if ($terse) {
 187         $emacs = 1;
 188         $quiet++;
 189 }
 190
 191 if ($tree) {
 192         if (defined $root) {
 193                 if (!top_of_kernel_tree($root)) {
 194                         die "$P: $root: --root does not point at a valid tree\n";
 195                 }
 196         } else {
 197                 if (top_of_kernel_tree('.')) {
 198                         $root = '.';
 199                 } elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
 200                                                 top_of_kernel_tree($1)) {
 201                         $root = $1;
 202                 }
 203         }
 204
 205         if (!defined $root) {
 206                 print "Must be run from the top-level dir. of a kernel tree\n";
 207                 exit(2);
 208         }
 209 }
 210
 211 my $emitted_corrupt = 0;
 212
 213 our $Ident      = qr{
 214                         [A-Za-z_][A-Za-z\d_]*
 215                         (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
 216                 }x;
 217 our $Storage    = qr{extern|static|asmlinkage};
 218 our $Sparse     = qr{
 219                         __force
 220                 }x;
 221
 222 # Notes to $Attribute:
 223 our $Attribute  = qr{
 224                         const|
 225                         volatile|
 226                         QEMU_NORETURN|
 227                         QEMU_WARN_UNUSED_RESULT|
 228                         QEMU_SENTINEL|
 229                         QEMU_PACKED|
 230                         GCC_FMT_ATTR
 231                   }x;
 232 our $Modifier;
 233 our $Inline     = qr{inline};
 234 our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
 235 our $Lval       = qr{$Ident(?:$Member)*};
 236
 237 our $Constant   = qr{(?:[0-9]+|0x[0-9a-fA-F]+)[UL]*};
 238 our $Assignment = qr{(?:\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=)};
 239 our $Compare    = qr{<=|>=|==|!=|<|>};
 240 our $Operators  = qr{
 241                         <=|>=|==|!=|
 242                         =>|->|<<|>>|<|>|!|~|
 243                         &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%
 244                   }x;
 245
 246 our $NonptrType;
 247 our $Type;
 248 our $Declare;
 249
 250 our $NON_ASCII_UTF8     = qr{
 251         [\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
 252         |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
 253         | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
 254         |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
 255         |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
 256         | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
 257         |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 258 }x;
 259
 260 our $UTF8       = qr{
 261         [\x09\x0A\x0D\x20-\x7E]              # ASCII
 262         | $NON_ASCII_UTF8
 263 }x;
 264
 265 # some readers default to ISO-8859-1 when showing email source. detect
 266 # when UTF-8 is incorrectly interpreted as ISO-8859-1 and reencoded back.
 267 # False positives are possible but very unlikely.
 268 our $UTF8_MOJIBAKE = qr{
 269         \xC3[\x82-\x9F] \xC2[\x80-\xBF]                    # c2-df 80-bf
 270         | \xC3\xA0 \xC2[\xA0-\xBF] \xC2[\x80-\xBF]         # e0 a0-bf 80-bf
 271         | \xC3[\xA1-\xAC\xAE\xAF] (?: \xC2[\x80-\xBF]){2}  # e1-ec/ee/ef 80-bf 80-bf
 272         | \xC3\xAD \xC2[\x80-\x9F] \xC2[\x80-\xBF]         # ed 80-9f 80-bf
 273         | \xC3\xB0 \xC2[\x90-\xBF] (?: \xC2[\x80-\xBF]){2} # f0 90-bf 80-bf 80-bf
 274         | \xC3[\xB1-\xB3] (?: \xC2[\x80-\xBF]){3}          # f1-f3 80-bf 80-bf 80-bf
 275         | \xC3\xB4 \xC2[\x80-\x8F] (?: \xC2[\x80-\xBF]){2} # f4 80-b8 80-bf 80-bf
 276 }x;
 277
 278 # There are still some false positives, but this catches most
 279 # common cases.
 280 our $typeTypedefs = qr{(?x:
 281         (?![KMGTPE]iB)                      # IEC binary prefix (do not match)
 282         [A-Z][A-Z\d_]*[a-z][A-Za-z\d_]*     # camelcase
 283         | [A-Z][A-Z\d_]*AIOCB               # all uppercase
 284         | [A-Z][A-Z\d_]*CPU                 # all uppercase
 285         | QEMUBH                            # all uppercase
 286 )};
 287
 288 our @typeList = (
 289         qr{void},
 290         qr{(?:unsigned\s+)?char},
 291         qr{(?:unsigned\s+)?short},
 292         qr{(?:unsigned\s+)?int},
 293         qr{(?:unsigned\s+)?long},
 294         qr{(?:unsigned\s+)?long\s+int},
 295         qr{(?:unsigned\s+)?long\s+long},
 296         qr{(?:unsigned\s+)?long\s+long\s+int},
 297         qr{unsigned},
 298         qr{float},
 299         qr{double},
 300         qr{bool},
 301         qr{struct\s+$Ident},
 302         qr{union\s+$Ident},
 303         qr{enum\s+$Ident},
 304         qr{${Ident}_t},
 305         qr{${Ident}_handler},
 306         qr{${Ident}_handler_fn},
 307         qr{target_(?:u)?long},
 308         qr{hwaddr},
 309         # external libraries
 310         qr{xml${Ident}},
 311         qr{xen\w+_handle},
 312         # Glib definitions
 313         qr{gchar},
 314         qr{gshort},
 315         qr{glong},
 316         qr{gint},
 317         qr{gboolean},
 318         qr{guchar},
 319         qr{gushort},
 320         qr{gulong},
 321         qr{guint},
 322         qr{gfloat},
 323         qr{gdouble},
 324         qr{gpointer},
 325         qr{gconstpointer},
 326         qr{gint8},
 327         qr{guint8},
 328         qr{gint16},
 329         qr{guint16},
 330         qr{gint32},
 331         qr{guint32},
 332         qr{gint64},
 333         qr{guint64},
 334         qr{gsize},
 335         qr{gssize},
 336         qr{goffset},
 337         qr{gintptr},
 338         qr{guintptr},
 339 );
 340
 341 # This can be modified by sub possible.  Since it can be empty, be careful
 342 # about regexes that always match, because they can cause infinite loops.
 343 our @modifierList = (
 344 );
 345
 346 sub build_types {
 347         my $all = "(?x:  \n" . join("|\n  ", @typeList) . "\n)";
 348         if (@modifierList > 0) {
 349                 my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
 350                 $Modifier = qr{(?:$Attribute|$Sparse|$mods)};
 351         } else {
 352                 $Modifier = qr{(?:$Attribute|$Sparse)};
 353         }
 354         $NonptrType     = qr{
 355                         (?:$Modifier\s+|const\s+)*
 356                         (?:
 357                                 (?:typeof|__typeof__)\s*\(\s*\**\s*$Ident\s*\)|
 358                                 (?:$typeTypedefs\b)|
 359                                 (?:${all}\b)
 360                         )
 361                         (?:\s+$Modifier|\s+const)*
 362                   }x;
 363         $Type   = qr{
 364                         $NonptrType
 365                         (?:[\s\*]+\s*const|[\s\*]+|(?:\s*\[\s*\])+)?
 366                         (?:\s+$Inline|\s+$Modifier)*
 367                   }x;
 368         $Declare        = qr{(?:$Storage\s+)?$Type};
 369 }
 370 build_types();
 371
 372 $chk_signoff = 0 if ($file);
 373
 374 my @rawlines = ();
 375 my @lines = ();
 376 my $vname;
 377 if ($chk_branch) {
 378         my @patches;
 379         my %git_commits = ();
 380         my $HASH;
 381         open($HASH, "-|", "git", "log", "--reverse", "--no-merges", "--format=%H %s", $ARGV[0]) ||
 382                 die "$P: git log --reverse --no-merges --format='%H %s' $ARGV[0] failed - $!\n";
 383
 384         for my $line (<$HASH>) {
 385                 $line =~ /^([0-9a-fA-F]{40,40}) (.*)$/;
 386                 next if (!defined($1) || !defined($2));
 387                 my $sha1 = $1;
 388                 my $subject = $2;
 389                 push(@patches, $sha1);
 390                 $git_commits{$sha1} = $subject;
 391         }
 392
 393         close $HASH;
 394
 395         die "$P: no revisions returned for revlist '$chk_branch'\n"
 396             unless @patches;
 397
 398         my $i = 1;
 399         my $num_patches = @patches;
 400         for my $hash (@patches) {
 401                 my $FILE;
 402                 open($FILE, '-|', "git", "show", $hash) ||
 403                         die "$P: git show $hash - $!\n";
 404                 while (<$FILE>) {
 405                         chomp;
 406                         push(@rawlines, $_);
 407                 }
 408                 close($FILE);
 409                 $vname = substr($hash, 0, 12) . ' (' . $git_commits{$hash} . ')';
 410                 if ($num_patches > 1 && $quiet == 0) {
 411                         my $prefix = "$i/$num_patches";
 412                         $prefix = BLUE . BOLD . $prefix . RESET if $color;
 413                         print "$prefix Checking commit $vname\n";
 414                         $vname = "Patch $i/$num_patches";
 415                 } else {
 416                         $vname = "Commit " . $vname;
 417                 }
 418                 if (!process($hash)) {
 419                         $exit = 1;
 420                         print "\n" if ($num_patches > 1 && $quiet == 0);
 421                 }
 422                 @rawlines = ();
 423                 @lines = ();
 424                 $i++;
 425         }
 426 } else {
 427         for my $filename (@ARGV) {
 428                 my $FILE;
 429                 if ($file) {
 430                         open($FILE, '-|', "diff -u /dev/null $filename") ||
 431                                 die "$P: $filename: diff failed - $!\n";
 432                 } elsif ($filename eq '-') {
 433                         open($FILE, '<&STDIN');
 434                 } else {
 435                         open($FILE, '<', "$filename") ||
 436                                 die "$P: $filename: open failed - $!\n";
 437                 }
 438                 if ($filename eq '-') {
 439                         $vname = 'Your patch';
 440                 } else {
 441                         $vname = $filename;
 442                 }
 443                 print "Checking $filename...\n" if @ARGV > 1 && $quiet == 0;
 444                 while (<$FILE>) {
 445                         chomp;
 446                         push(@rawlines, $_);
 447                 }
 448                 close($FILE);
 449                 if (!process($filename)) {
 450                         $exit = 1;
 451                 }
 452                 @rawlines = ();
 453                 @lines = ();
 454         }
 455 }
 456
 457 exit($exit);
 458
 459 sub top_of_kernel_tree {
 460         my ($root) = @_;
 461
 462         my @tree_check = (
 463                 "COPYING", "MAINTAINERS", "Makefile",
 464                 "README.rst", "docs", "VERSION",
 465                 "linux-user", "softmmu"
 466         );
 467
 468         foreach my $check (@tree_check) {
 469                 if (! -e $root . '/' . $check) {
 470                         return 0;
 471                 }
 472         }
 473         return 1;
 474 }
 475
 476 sub expand_tabs {
 477         my ($str) = @_;
 478
 479         my $res = '';
 480         my $n = 0;
 481         for my $c (split(//, $str)) {
 482                 if ($c eq "\t") {
 483                         $res .= ' ';
 484                         $n++;
 485                         for (; ($n % 8) != 0; $n++) {
 486                                 $res .= ' ';
 487                         }
 488                         next;
 489                 }
 490                 $res .= $c;
 491                 $n++;
 492         }
 493
 494         return $res;
 495 }
 496 sub copy_spacing {
 497         (my $res = shift) =~ tr/\t/ /c;
 498         return $res;
 499 }
 500
 501 sub line_stats {
 502         my ($line) = @_;
 503
 504         # Drop the diff line leader and expand tabs
 505         $line =~ s/^.//;
 506         $line = expand_tabs($line);
 507
 508         # Pick the indent from the front of the line.
 509         my ($white) = ($line =~ /^(\s*)/);
 510
 511         return (length($line), length($white));
 512 }
 513
 514 my $sanitise_quote = '';
 515
 516 sub sanitise_line_reset {
 517         my ($in_comment) = @_;
 518
 519         if ($in_comment) {
 520                 $sanitise_quote = '*/';
 521         } else {
 522                 $sanitise_quote = '';
 523         }
 524 }
 525 sub sanitise_line {
 526         my ($line) = @_;
 527
 528         my $res = '';
 529         my $l = '';
 530
 531         my $qlen = 0;
 532         my $off = 0;
 533         my $c;
 534
 535         # Always copy over the diff marker.
 536         $res = substr($line, 0, 1);
 537
 538         for ($off = 1; $off < length($line); $off++) {
 539                 $c = substr($line, $off, 1);
 540
 541                 # Comments we are wacking completely including the begin
 542                 # and end, all to $;.
 543                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
 544                         $sanitise_quote = '*/';
 545
 546                         substr($res, $off, 2, "$;$;");
 547                         $off++;
 548                         next;
 549                 }
 550                 if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
 551                         $sanitise_quote = '';
 552                         substr($res, $off, 2, "$;$;");
 553                         $off++;
 554                         next;
 555                 }
 556                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
 557                         $sanitise_quote = '//';
 558
 559                         substr($res, $off, 2, $sanitise_quote);
 560                         $off++;
 561                         next;
 562                 }
 563
 564                 # A \ in a string means ignore the next character.
 565                 if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
 566                     $c eq "\\") {
 567                         substr($res, $off, 2, 'XX');
 568                         $off++;
 569                         next;
 570                 }
 571                 # Regular quotes.
 572                 if ($c eq "'" || $c eq '"') {
 573                         if ($sanitise_quote eq '') {
 574                                 $sanitise_quote = $c;
 575
 576                                 substr($res, $off, 1, $c);
 577                                 next;
 578                         } elsif ($sanitise_quote eq $c) {
 579                                 $sanitise_quote = '';
 580                         }
 581                 }
 582
 583                 #print "c<$c> SQ<$sanitise_quote>\n";
 584                 if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
 585                         substr($res, $off, 1, $;);
 586                 } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
 587                         substr($res, $off, 1, $;);
 588                 } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
 589                         substr($res, $off, 1, 'X');
 590                 } else {
 591                         substr($res, $off, 1, $c);
 592                 }
 593         }
 594
 595         if ($sanitise_quote eq '//') {
 596                 $sanitise_quote = '';
 597         }
 598
 599         # The pathname on a #include may be surrounded by '<' and '>'.
 600         if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
 601                 my $clean = 'X' x length($1);
 602                 $res =~ s@\<.*\>@<$clean>@;
 603
 604         # The whole of a #error is a string.
 605         } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
 606                 my $clean = 'X' x length($1);
 607                 $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
 608         }
 609
 610         return $res;
 611 }
 612
 613 sub ctx_statement_block {
 614         my ($linenr, $remain, $off) = @_;
 615         my $line = $linenr - 1;
 616         my $blk = '';
 617         my $soff = $off;
 618         my $coff = $off - 1;
 619         my $coff_set = 0;
 620
 621         my $loff = 0;
 622
 623         my $type = '';
 624         my $level = 0;
 625         my @stack = ();
 626         my $p;
 627         my $c;
 628         my $len = 0;
 629
 630         my $remainder;
 631         while (1) {
 632                 @stack = (['', 0]) if ($#stack == -1);
 633
 634                 #warn "CSB: blk<$blk> remain<$remain>\n";
 635                 # If we are about to drop off the end, pull in more
 636                 # context.
 637                 if ($off >= $len) {
 638                         for (; $remain > 0; $line++) {
 639                                 last if (!defined $lines[$line]);
 640                                 next if ($lines[$line] =~ /^-/);
 641                                 $remain--;
 642                                 $loff = $len;
 643                                 $blk .= $lines[$line] . "\n";
 644                                 $len = length($blk);
 645                                 $line++;
 646                                 last;
 647                         }
 648                         # Bail if there is no further context.
 649                         #warn "CSB: blk<$blk> off<$off> len<$len>\n";
 650                         if ($off >= $len) {
 651                                 last;
 652                         }
 653                 }
 654                 $p = $c;
 655                 $c = substr($blk, $off, 1);
 656                 $remainder = substr($blk, $off);
 657
 658                 #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
 659
 660                 # Handle nested #if/#else.
 661                 if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
 662                         push(@stack, [ $type, $level ]);
 663                 } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
 664                         ($type, $level) = @{$stack[$#stack - 1]};
 665                 } elsif ($remainder =~ /^#\s*endif\b/) {
 666                         ($type, $level) = @{pop(@stack)};
 667                 }
 668
 669                 # Statement ends at the ';' or a close '}' at the
 670                 # outermost level.
 671                 if ($level == 0 && $c eq ';') {
 672                         last;
 673                 }
 674
 675                 # An else is really a conditional as long as its not else if
 676                 if ($level == 0 && $coff_set == 0 &&
 677                                 (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
 678                                 $remainder =~ /^(else)(?:\s|{)/ &&
 679                                 $remainder !~ /^else\s+if\b/) {
 680                         $coff = $off + length($1) - 1;
 681                         $coff_set = 1;
 682                         #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
 683                         #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
 684                 }
 685
 686                 if (($type eq '' || $type eq '(') && $c eq '(') {
 687                         $level++;
 688                         $type = '(';
 689                 }
 690                 if ($type eq '(' && $c eq ')') {
 691                         $level--;
 692                         $type = ($level != 0)? '(' : '';
 693
 694                         if ($level == 0 && $coff < $soff) {
 695                                 $coff = $off;
 696                                 $coff_set = 1;
 697                                 #warn "CSB: mark coff<$coff>\n";
 698                         }
 699                 }
 700                 if (($type eq '' || $type eq '{') && $c eq '{') {
 701                         $level++;
 702                         $type = '{';
 703                 }
 704                 if ($type eq '{' && $c eq '}') {
 705                         $level--;
 706                         $type = ($level != 0)? '{' : '';
 707
 708                         if ($level == 0) {
 709                                 if (substr($blk, $off + 1, 1) eq ';') {
 710                                         $off++;
 711                                 }
 712                                 last;
 713                         }
 714                 }
 715                 $off++;
 716         }
 717         # We are truly at the end, so shuffle to the next line.
 718         if ($off == $len) {
 719                 $loff = $len + 1;
 720                 $line++;
 721                 $remain--;
 722         }
 723
 724         my $statement = substr($blk, $soff, $off - $soff + 1);
 725         my $condition = substr($blk, $soff, $coff - $soff + 1);
 726
 727         #warn "STATEMENT<$statement>\n";
 728         #warn "CONDITION<$condition>\n";
 729
 730         #print "coff<$coff> soff<$off> loff<$loff>\n";
 731
 732         return ($statement, $condition,
 733                         $line, $remain + 1, $off - $loff + 1, $level);
 734 }
 735
 736 sub statement_lines {
 737         my ($stmt) = @_;
 738
 739         # Strip the diff line prefixes and rip blank lines at start and end.
 740         $stmt =~ s/(^|\n)./$1/g;
 741         $stmt =~ s/^\s*//;
 742         $stmt =~ s/\s*$//;
 743
 744         my @stmt_lines = ($stmt =~ /\n/g);
 745
 746         return $#stmt_lines + 2;
 747 }
 748
 749 sub statement_rawlines {
 750         my ($stmt) = @_;
 751
 752         my @stmt_lines = ($stmt =~ /\n/g);
 753
 754         return $#stmt_lines + 2;
 755 }
 756
 757 sub statement_block_size {
 758         my ($stmt) = @_;
 759
 760         $stmt =~ s/(^|\n)./$1/g;
 761         $stmt =~ s/^\s*\{//;
 762         $stmt =~ s/}\s*$//;
 763         $stmt =~ s/^\s*//;
 764         $stmt =~ s/\s*$//;
 765
 766         my @stmt_lines = ($stmt =~ /\n/g);
 767         my @stmt_statements = ($stmt =~ /;/g);
 768
 769         my $stmt_lines = $#stmt_lines + 2;
 770         my $stmt_statements = $#stmt_statements + 1;
 771
 772         if ($stmt_lines > $stmt_statements) {
 773                 return $stmt_lines;
 774         } else {
 775                 return $stmt_statements;
 776         }
 777 }
 778
 779 sub ctx_statement_full {
 780         my ($linenr, $remain, $off) = @_;
 781         my ($statement, $condition, $level);
 782
 783         my (@chunks);
 784
 785         # Grab the first conditional/block pair.
 786         ($statement, $condition, $linenr, $remain, $off, $level) =
 787                                 ctx_statement_block($linenr, $remain, $off);
 788         #print "F: c<$condition> s<$statement> remain<$remain>\n";
 789         push(@chunks, [ $condition, $statement ]);
 790         if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
 791                 return ($level, $linenr, @chunks);
 792         }
 793
 794         # Pull in the following conditional/block pairs and see if they
 795         # could continue the statement.
 796         for (;;) {
 797                 ($statement, $condition, $linenr, $remain, $off, $level) =
 798                                 ctx_statement_block($linenr, $remain, $off);
 799                 #print "C: c<$condition> s<$statement> remain<$remain>\n";
 800                 last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
 801                 #print "C: push\n";
 802                 push(@chunks, [ $condition, $statement ]);
 803         }
 804
 805         return ($level, $linenr, @chunks);
 806 }
 807
 808 sub ctx_block_get {
 809         my ($linenr, $remain, $outer, $open, $close, $off) = @_;
 810         my $line;
 811         my $start = $linenr - 1;
 812         my $blk = '';
 813         my @o;
 814         my @c;
 815         my @res = ();
 816
 817         my $level = 0;
 818         my @stack = ($level);
 819         for ($line = $start; $remain > 0; $line++) {
 820                 next if ($rawlines[$line] =~ /^-/);
 821                 $remain--;
 822
 823                 $blk .= $rawlines[$line];
 824
 825                 # Handle nested #if/#else.
 826                 if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
 827                         push(@stack, $level);
 828                 } elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
 829                         $level = $stack[$#stack - 1];
 830                 } elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
 831                         $level = pop(@stack);
 832                 }
 833
 834                 foreach my $c (split(//, $lines[$line])) {
 835                         ##print "C<$c>L<$level><$open$close>O<$off>\n";
 836                         if ($off > 0) {
 837                                 $off--;
 838                                 next;
 839                         }
 840
 841                         if ($c eq $close && $level > 0) {
 842                                 $level--;
 843                                 last if ($level == 0);
 844                         } elsif ($c eq $open) {
 845                                 $level++;
 846                         }
 847                 }
 848
 849                 if (!$outer || $level <= 1) {
 850                         push(@res, $rawlines[$line]);
 851                 }
 852
 853                 last if ($level == 0);
 854         }
 855
 856         return ($level, @res);
 857 }
 858 sub ctx_block_outer {
 859         my ($linenr, $remain) = @_;
 860
 861         my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
 862         return @r;
 863 }
 864 sub ctx_block {
 865         my ($linenr, $remain) = @_;
 866
 867         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 868         return @r;
 869 }
 870 sub ctx_statement {
 871         my ($linenr, $remain, $off) = @_;
 872
 873         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 874         return @r;
 875 }
 876 sub ctx_block_level {
 877         my ($linenr, $remain) = @_;
 878
 879         return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
 880 }
 881 sub ctx_statement_level {
 882         my ($linenr, $remain, $off) = @_;
 883
 884         return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
 885 }
 886
 887 sub ctx_locate_comment {
 888         my ($first_line, $end_line) = @_;
 889
 890         # Catch a comment on the end of the line itself.
 891         my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
 892         return $current_comment if (defined $current_comment);
 893
 894         # Look through the context and try and figure out if there is a
 895         # comment.
 896         my $in_comment = 0;
 897         $current_comment = '';
 898         for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
 899                 my $line = $rawlines[$linenr - 1];
 900                 #warn "           $line\n";
 901                 if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
 902                         $in_comment = 1;
 903                 }
 904                 if ($line =~ m@/\*@) {
 905                         $in_comment = 1;
 906                 }
 907                 if (!$in_comment && $current_comment ne '') {
 908                         $current_comment = '';
 909                 }
 910                 $current_comment .= $line . "\n" if ($in_comment);
 911                 if ($line =~ m@\*/@) {
 912                         $in_comment = 0;
 913                 }
 914         }
 915
 916         chomp($current_comment);
 917         return($current_comment);
 918 }
 919 sub ctx_has_comment {
 920         my ($first_line, $end_line) = @_;
 921         my $cmt = ctx_locate_comment($first_line, $end_line);
 922
 923         ##print "LINE: $rawlines[$end_line - 1 ]\n";
 924         ##print "CMMT: $cmt\n";
 925
 926         return ($cmt ne '');
 927 }
 928
 929 sub raw_line {
 930         my ($linenr, $cnt) = @_;
 931
 932         my $offset = $linenr - 1;
 933         $cnt++;
 934
 935         my $line;
 936         while ($cnt) {
 937                 $line = $rawlines[$offset++];
 938                 next if (defined($line) && $line =~ /^-/);
 939                 $cnt--;
 940         }
 941
 942         return $line;
 943 }
 944
 945 sub cat_vet {
 946         my ($vet) = @_;
 947         my ($res, $coded);
 948
 949         $res = '';
 950         while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
 951                 $res .= $1;
 952                 if ($2 ne '') {
 953                         $coded = sprintf("^%c", unpack('C', $2) + 64);
 954                         $res .= $coded;
 955                 }
 956         }
 957         $res =~ s/$/\$/;
 958
 959         return $res;
 960 }
 961
 962 my $av_preprocessor = 0;
 963 my $av_pending;
 964 my @av_paren_type;
 965 my $av_pend_colon;
 966
 967 sub annotate_reset {
 968         $av_preprocessor = 0;
 969         $av_pending = '_';
 970         @av_paren_type = ('E');
 971         $av_pend_colon = 'O';
 972 }
 973
 974 sub annotate_values {
 975         my ($stream, $type) = @_;
 976
 977         my $res;
 978         my $var = '_' x length($stream);
 979         my $cur = $stream;
 980
 981         print "$stream\n" if ($dbg_values > 1);
 982
 983         while (length($cur)) {
 984                 @av_paren_type = ('E') if ($#av_paren_type < 0);
 985                 print " <" . join('', @av_paren_type) .
 986                                 "> <$type> <$av_pending>" if ($dbg_values > 1);
 987                 if ($cur =~ /^(\s+)/o) {
 988                         print "WS($1)\n" if ($dbg_values > 1);
 989                         if ($1 =~ /\n/ && $av_preprocessor) {
 990                                 $type = pop(@av_paren_type);
 991                                 $av_preprocessor = 0;
 992                         }
 993
 994                 } elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
 995                         print "CAST($1)\n" if ($dbg_values > 1);
 996                         push(@av_paren_type, $type);
 997                         $type = 'C';
 998
 999                 } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
1000                         print "DECLARE($1)\n" if ($dbg_values > 1);
1001                         $type = 'T';
1002
1003                 } elsif ($cur =~ /^($Modifier)\s*/) {
1004                         print "MODIFIER($1)\n" if ($dbg_values > 1);
1005                         $type = 'T';
1006
1007                 } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
1008                         print "DEFINE($1,$2)\n" if ($dbg_values > 1);
1009                         $av_preprocessor = 1;
1010                         push(@av_paren_type, $type);
1011                         if ($2 ne '') {
1012                                 $av_pending = 'N';
1013                         }
1014                         $type = 'E';
1015
1016                 } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
1017                         print "UNDEF($1)\n" if ($dbg_values > 1);
1018                         $av_preprocessor = 1;
1019                         push(@av_paren_type, $type);
1020
1021                 } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
1022                         print "PRE_START($1)\n" if ($dbg_values > 1);
1023                         $av_preprocessor = 1;
1024
1025                         push(@av_paren_type, $type);
1026                         push(@av_paren_type, $type);
1027                         $type = 'E';
1028
1029                 } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
1030                         print "PRE_RESTART($1)\n" if ($dbg_values > 1);
1031                         $av_preprocessor = 1;
1032
1033                         push(@av_paren_type, $av_paren_type[$#av_paren_type]);
1034
1035                         $type = 'E';
1036
1037                 } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
1038                         print "PRE_END($1)\n" if ($dbg_values > 1);
1039
1040                         $av_preprocessor = 1;
1041
1042                         # Assume all arms of the conditional end as this
1043                         # one does, and continue as if the #endif was not here.
1044                         pop(@av_paren_type);
1045                         push(@av_paren_type, $type);
1046                         $type = 'E';
1047
1048                 } elsif ($cur =~ /^(\\\n)/o) {
1049                         print "PRECONT($1)\n" if ($dbg_values > 1);
1050
1051                 } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
1052                         print "ATTR($1)\n" if ($dbg_values > 1);
1053                         $av_pending = $type;
1054                         $type = 'N';
1055
1056                 } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
1057                         print "SIZEOF($1)\n" if ($dbg_values > 1);
1058                         if (defined $2) {
1059                                 $av_pending = 'V';
1060                         }
1061                         $type = 'N';
1062
1063                 } elsif ($cur =~ /^(if|while|for)\b/o) {
1064                         print "COND($1)\n" if ($dbg_values > 1);
1065                         $av_pending = 'E';
1066                         $type = 'N';
1067
1068                 } elsif ($cur =~/^(case)/o) {
1069                         print "CASE($1)\n" if ($dbg_values > 1);
1070                         $av_pend_colon = 'C';
1071                         $type = 'N';
1072
1073                 } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
1074                         print "KEYWORD($1)\n" if ($dbg_values > 1);
1075                         $type = 'N';
1076
1077                 } elsif ($cur =~ /^(\()/o) {
1078                         print "PAREN('$1')\n" if ($dbg_values > 1);
1079                         push(@av_paren_type, $av_pending);
1080                         $av_pending = '_';
1081                         $type = 'N';
1082
1083                 } elsif ($cur =~ /^(\))/o) {
1084                         my $new_type = pop(@av_paren_type);
1085                         if ($new_type ne '_') {
1086                                 $type = $new_type;
1087                                 print "PAREN('$1') -> $type\n"
1088                                                         if ($dbg_values > 1);
1089                         } else {
1090                                 print "PAREN('$1')\n" if ($dbg_values > 1);
1091                         }
1092
1093                 } elsif ($cur =~ /^($Ident)\s*\(/o) {
1094                         print "FUNC($1)\n" if ($dbg_values > 1);
1095                         $type = 'V';
1096                         $av_pending = 'V';
1097
1098                 } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
1099                         if (defined $2 && $type eq 'C' || $type eq 'T') {
1100                                 $av_pend_colon = 'B';
1101                         } elsif ($type eq 'E') {
1102                                 $av_pend_colon = 'L';
1103                         }
1104                         print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
1105                         $type = 'V';
1106
1107                 } elsif ($cur =~ /^($Ident|$Constant)/o) {
1108                         print "IDENT($1)\n" if ($dbg_values > 1);
1109                         $type = 'V';
1110
1111                 } elsif ($cur =~ /^($Assignment)/o) {
1112                         print "ASSIGN($1)\n" if ($dbg_values > 1);
1113                         $type = 'N';
1114
1115                 } elsif ($cur =~/^(;|{|})/) {
1116                         print "END($1)\n" if ($dbg_values > 1);
1117                         $type = 'E';
1118                         $av_pend_colon = 'O';
1119
1120                 } elsif ($cur =~/^(,)/) {
1121                         print "COMMA($1)\n" if ($dbg_values > 1);
1122                         $type = 'C';
1123
1124                 } elsif ($cur =~ /^(\?)/o) {
1125                         print "QUESTION($1)\n" if ($dbg_values > 1);
1126                         $type = 'N';
1127
1128                 } elsif ($cur =~ /^(:)/o) {
1129                         print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
1130
1131                         substr($var, length($res), 1, $av_pend_colon);
1132                         if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
1133                                 $type = 'E';
1134                         } else {
1135                                 $type = 'N';
1136                         }
1137                         $av_pend_colon = 'O';
1138
1139                 } elsif ($cur =~ /^(\[)/o) {
1140                         print "CLOSE($1)\n" if ($dbg_values > 1);
1141                         $type = 'N';
1142
1143                 } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1144                         my $variant;
1145
1146                         print "OPV($1)\n" if ($dbg_values > 1);
1147                         if ($type eq 'V') {
1148                                 $variant = 'B';
1149                         } else {
1150                                 $variant = 'U';
1151                         }
1152
1153                         substr($var, length($res), 1, $variant);
1154                         $type = 'N';
1155
1156                 } elsif ($cur =~ /^($Operators)/o) {
1157                         print "OP($1)\n" if ($dbg_values > 1);
1158                         if ($1 ne '++' && $1 ne '--') {
1159                                 $type = 'N';
1160                         }
1161
1162                 } elsif ($cur =~ /(^.)/o) {
1163                         print "C($1)\n" if ($dbg_values > 1);
1164                 }
1165                 if (defined $1) {
1166                         $cur = substr($cur, length($1));
1167                         $res .= $type x length($1);
1168                 }
1169         }
1170
1171         return ($res, $var);
1172 }
1173
1174 sub possible {
1175         my ($possible, $line) = @_;
1176         my $notPermitted = qr{(?:
1177                 ^(?:
1178                         $Modifier|
1179                         $Storage|
1180                         $Type|
1181                         DEFINE_\S+
1182                 )$|
1183                 ^(?:
1184                         goto|
1185                         return|
1186                         case|
1187                         else|
1188                         asm|__asm__|
1189                         do
1190                 )(?:\s|$)|
1191                 ^(?:typedef|struct|enum)\b|
1192                 ^\#
1193             )}x;
1194         warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
1195         if ($possible !~ $notPermitted) {
1196                 # Check for modifiers.
1197                 $possible =~ s/\s*$Storage\s*//g;
1198                 $possible =~ s/\s*$Sparse\s*//g;
1199                 if ($possible =~ /^\s*$/) {
1200
1201                 } elsif ($possible =~ /\s/) {
1202                         $possible =~ s/\s*(?:$Type|\#\#)\s*//g;
1203                         for my $modifier (split(' ', $possible)) {
1204                                 if ($modifier !~ $notPermitted) {
1205                                         warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
1206                                         push(@modifierList, $modifier);
1207                                 }
1208                         }
1209
1210                 } else {
1211                         warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
1212                         push(@typeList, $possible);
1213                 }
1214                 build_types();
1215         } else {
1216                 warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
1217         }
1218 }
1219
1220 my $prefix = '';
1221
1222 sub report {
1223         my ($level, $msg) = @_;
1224         if (defined $tst_only && $msg !~ /\Q$tst_only\E/) {
1225                 return 0;
1226         }
1227
1228         my $output = '';
1229         $output .= BOLD if $color;
1230         $output .= $prefix;
1231         $output .= RED if $color && $level eq 'ERROR';
1232         $output .= MAGENTA if $color && $level eq 'WARNING';
1233         $output .= $level . ':';
1234         $output .= RESET if $color;
1235         $output .= ' ' . $msg . "\n";
1236
1237         $output = (split('\n', $output))[0] . "\n" if ($terse);
1238
1239         push(our @report, $output);
1240
1241         return 1;
1242 }
1243 sub report_dump {
1244         our @report;
1245 }
1246 sub ERROR {
1247         if (report("ERROR", $_[0])) {
1248                 our $clean = 0;
1249                 our $cnt_error++;
1250         }
1251 }
1252 sub WARN {
1253         if (report("WARNING", $_[0])) {
1254                 our $clean = 0;
1255                 our $cnt_warn++;
1256         }
1257 }
1258
1259 # According to tests/qtest/bios-tables-test.c: do not
1260 # change expected file in the same commit with adding test
1261 sub checkfilename {
1262         my ($name, $acpi_testexpected, $acpi_nontestexpected) = @_;
1263
1264         # Note: shell script that rebuilds the expected files is in the same
1265         # directory as files themselves.
1266         # Note: allowed diff list can be changed both when changing expected
1267         # files and when changing tests.
1268         if ($name =~ m#^tests/data/acpi/# and not $name =~ m#^\.sh$#) {
1269                 $$acpi_testexpected = $name;
1270         } elsif ($name !~ m#^tests/qtest/bios-tables-test-allowed-diff.h$#) {
1271                 $$acpi_nontestexpected = $name;
1272         }
1273         if (defined $$acpi_testexpected and defined $$acpi_nontestexpected) {
1274                 ERROR("Do not add expected files together with tests, " .
1275                       "follow instructions in " .
1276                       "tests/qtest/bios-tables-test.c: both " .
1277                       $$acpi_testexpected . " and " .
1278                       $$acpi_nontestexpected . " found\n");
1279         }
1280 }
1281
1282 sub process {
1283         my $filename = shift;
1284
1285         my $linenr=0;
1286         my $prevline="";
1287         my $prevrawline="";
1288         my $stashline="";
1289         my $stashrawline="";
1290
1291         my $length;
1292         my $indent;
1293         my $previndent=0;
1294         my $stashindent=0;
1295
1296         our $clean = 1;
1297         my $signoff = 0;
1298         my $is_patch = 0;
1299
1300         my $in_header_lines = $file ? 0 : 1;
1301         my $in_commit_log = 0;          #Scanning lines before patch
1302         my $reported_maintainer_file = 0;
1303         my $non_utf8_charset = 0;
1304
1305         our @report = ();
1306         our $cnt_lines = 0;
1307         our $cnt_error = 0;
1308         our $cnt_warn = 0;
1309         our $cnt_chk = 0;
1310
1311         # Trace the real file/line as we go.
1312         my $realfile = '';
1313         my $realline = 0;
1314         my $realcnt = 0;
1315         my $here = '';
1316         my $in_comment = 0;
1317         my $comment_edge = 0;
1318         my $first_line = 0;
1319         my $p1_prefix = '';
1320
1321         my $prev_values = 'E';
1322
1323         # suppression flags
1324         my %suppress_ifbraces;
1325         my %suppress_whiletrailers;
1326         my %suppress_export;
1327
1328         my $acpi_testexpected;
1329         my $acpi_nontestexpected;
1330
1331         # Pre-scan the patch sanitizing the lines.
1332
1333         sanitise_line_reset();
1334         my $line;
1335         foreach my $rawline (@rawlines) {
1336                 $linenr++;
1337                 $line = $rawline;
1338
1339                 if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1340                         $realline=$1-1;
1341                         if (defined $2) {
1342                                 $realcnt=$3+1;
1343                         } else {
1344                                 $realcnt=1+1;
1345                         }
1346                         $in_comment = 0;
1347
1348                         # Guestimate if this is a continuing comment.  Run
1349                         # the context looking for a comment "edge".  If this
1350                         # edge is a close comment then we must be in a comment
1351                         # at context start.
1352                         my $edge;
1353                         my $cnt = $realcnt;
1354                         for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1355                                 next if (defined $rawlines[$ln - 1] &&
1356                                          $rawlines[$ln - 1] =~ /^-/);
1357                                 $cnt--;
1358                                 #print "RAW<$rawlines[$ln - 1]>\n";
1359                                 last if (!defined $rawlines[$ln - 1]);
1360                                 if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1361                                     $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1362                                         ($edge) = $1;
1363                                         last;
1364                                 }
1365                         }
1366                         if (defined $edge && $edge eq '*/') {
1367                                 $in_comment = 1;
1368                         }
1369
1370                         # Guestimate if this is a continuing comment.  If this
1371                         # is the start of a diff block and this line starts
1372                         # ' *' then it is very likely a comment.
1373                         if (!defined $edge &&
1374                             $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1375                         {
1376                                 $in_comment = 1;
1377                         }
1378
1379                         ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1380                         sanitise_line_reset($in_comment);
1381
1382                 } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1383                         # Standardise the strings and chars within the input to
1384                         # simplify matching -- only bother with positive lines.
1385                         $line = sanitise_line($rawline);
1386                 }
1387                 push(@lines, $line);
1388
1389                 if ($realcnt > 1) {
1390                         $realcnt-- if ($line =~ /^(?:\+| |$)/);
1391                 } else {
1392                         $realcnt = 0;
1393                 }
1394
1395                 #print "==>$rawline\n";
1396                 #print "-->$line\n";
1397         }
1398
1399         $prefix = '';
1400
1401         $realcnt = 0;
1402         $linenr = 0;
1403         foreach my $line (@lines) {
1404                 $linenr++;
1405
1406                 my $rawline = $rawlines[$linenr - 1];
1407
1408 #extract the line range in the file after the patch is applied
1409                 if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1410                         $is_patch = 1;
1411                         $first_line = $linenr + 1;
1412                         $realline=$1-1;
1413                         if (defined $2) {
1414                                 $realcnt=$3+1;
1415                         } else {
1416                                 $realcnt=1+1;
1417                         }
1418                         annotate_reset();
1419                         $prev_values = 'E';
1420
1421                         %suppress_ifbraces = ();
1422                         %suppress_whiletrailers = ();
1423                         %suppress_export = ();
1424                         next;
1425
1426 # track the line number as we move through the hunk, note that
1427 # new versions of GNU diff omit the leading space on completely
1428 # blank context lines so we need to count that too.
1429                 } elsif ($line =~ /^( |\+|$)/) {
1430                         $realline++;
1431                         $realcnt-- if ($realcnt != 0);
1432
1433                         # Measure the line length and indent.
1434                         ($length, $indent) = line_stats($rawline);
1435
1436                         # Track the previous line.
1437                         ($prevline, $stashline) = ($stashline, $line);
1438                         ($previndent, $stashindent) = ($stashindent, $indent);
1439                         ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
1440
1441                         #warn "line<$line>\n";
1442
1443                 } elsif ($realcnt == 1) {
1444                         $realcnt--;
1445                 }
1446
1447                 my $hunk_line = ($realcnt != 0);
1448
1449 #make up the handle for any error we report on this line
1450                 $prefix = "$filename:$realline: " if ($emacs && $file);
1451                 $prefix = "$filename:$linenr: " if ($emacs && !$file);
1452
1453                 $here = "#$linenr: " if (!$file);
1454                 $here = "#$realline: " if ($file);
1455
1456                 # extract the filename as it passes
1457                 if ($line =~ /^diff --git.*?(\S+)$/) {
1458                         $realfile = $1;
1459                         $realfile =~ s@^([^/]*)/@@ if (!$file);
1460                         checkfilename($realfile, \$acpi_testexpected, \$acpi_nontestexpected);
1461                 } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
1462                         $realfile = $1;
1463                         $realfile =~ s@^([^/]*)/@@ if (!$file);
1464                         checkfilename($realfile, \$acpi_testexpected, \$acpi_nontestexpected);
1465
1466                         $p1_prefix = $1;
1467                         if (!$file && $tree && $p1_prefix ne '' &&
1468                             -e "$root/$p1_prefix") {
1469                                 WARN("patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
1470                         }
1471
1472                         next;
1473                 }
1474
1475                 $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
1476
1477                 my $hereline = "$here\n$rawline\n";
1478                 my $herecurr = "$here\n$rawline\n";
1479                 my $hereprev = "$here\n$prevrawline\n$rawline\n";
1480
1481                 $cnt_lines++ if ($realcnt != 0);
1482
1483 # Check for incorrect file permissions
1484                 if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
1485                         my $permhere = $here . "FILE: $realfile\n";
1486                         if ($realfile =~ /(\bMakefile(?:\.objs)?|\.c|\.cc|\.cpp|\.h|\.mak|\.[sS])$/) {
1487                                 ERROR("do not set execute permissions for source files\n" . $permhere);
1488                         }
1489                 }
1490
1491 # Only allow Python 3 interpreter
1492                 if ($realline == 1 &&
1493                         $line =~ /^\+#!\ *\/usr\/bin\/(?:env )?python$/) {
1494                         ERROR("please use python3 interpreter\n" . $herecurr);
1495                 }
1496
1497 # Accept git diff extended headers as valid patches
1498                 if ($line =~ /^(?:rename|copy) (?:from|to) [\w\/\.\-]+\s*$/) {
1499                         $is_patch = 1;
1500                 }
1501
1502                 if ($line =~ /^Author: .*via Qemu-devel.*<qemu-devel\@nongnu.org>/) {
1503                     ERROR("Author email address is mangled by the mailing list\n" . $herecurr);
1504                 }
1505
1506 #check the patch for a signoff:
1507                 if ($line =~ /^\s*signed-off-by:/i) {
1508                         # This is a signoff, if ugly, so do not double report.
1509                         $signoff++;
1510                         $in_commit_log = 0;
1511
1512                         if (!($line =~ /^\s*Signed-off-by:/)) {
1513                                 ERROR("The correct form is \"Signed-off-by\"\n" .
1514                                         $herecurr);
1515                         }
1516                         if ($line =~ /^\s*signed-off-by:\S/i) {
1517                                 ERROR("space required after Signed-off-by:\n" .
1518                                         $herecurr);
1519                         }
1520                 }
1521
1522 # Check if MAINTAINERS is being updated.  If so, there's probably no need to
1523 # emit the "does MAINTAINERS need updating?" message on file add/move/delete
1524                 if ($line =~ /^\s*MAINTAINERS\s*\|/) {
1525                         $reported_maintainer_file = 1;
1526                 }
1527
1528 # Check for added, moved or deleted files
1529                 if (!$reported_maintainer_file && !$in_commit_log &&
1530                     ($line =~ /^(?:new|deleted) file mode\s*\d+\s*$/ ||
1531                      $line =~ /^rename (?:from|to) [\w\/\.\-]+\s*$/ ||
1532                      ($line =~ /\{\s*([\w\/\.\-]*)\s*\=\>\s*([\w\/\.\-]*)\s*\}/ &&
1533                       (defined($1) || defined($2))))) {
1534                         $reported_maintainer_file = 1;
1535                         WARN("added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr);
1536                 }
1537
1538 # Check for wrappage within a valid hunk of the file
1539                 if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
1540                         ERROR("patch seems to be corrupt (line wrapped?)\n" .
1541                                 $herecurr) if (!$emitted_corrupt++);
1542                 }
1543
1544 # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
1545                 if (($realfile =~ /^$/ || $line =~ /^\+/) &&
1546                     $rawline !~ m/^$UTF8*$/) {
1547                         my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
1548
1549                         my $blank = copy_spacing($rawline);
1550                         my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
1551                         my $hereptr = "$hereline$ptr\n";
1552
1553                         ERROR("Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
1554                 }
1555
1556                 if ($rawline =~ m/$UTF8_MOJIBAKE/) {
1557                         ERROR("Doubly-encoded UTF-8\n" . $herecurr);
1558                 }
1559 # Check if it's the start of a commit log
1560 # (not a header line and we haven't seen the patch filename)
1561                 if ($in_header_lines && $realfile =~ /^$/ &&
1562                     !($rawline =~ /^\s+\S/ ||
1563                       $rawline =~ /^(commit\b|from\b|[\w-]+:).*$/i)) {
1564                         $in_header_lines = 0;
1565                         $in_commit_log = 1;
1566                 }
1567
1568 # Check if there is UTF-8 in a commit log when a mail header has explicitly
1569 # declined it, i.e defined some charset where it is missing.
1570                 if ($in_header_lines &&
1571                     $rawline =~ /^Content-Type:.+charset="(.+)".*$/ &&
1572                     $1 !~ /utf-8/i) {
1573                         $non_utf8_charset = 1;
1574                 }
1575
1576                 if ($in_commit_log && $non_utf8_charset && $realfile =~ /^$/ &&
1577                     $rawline =~ /$NON_ASCII_UTF8/) {
1578                         WARN("8-bit UTF-8 used in possible commit log\n" . $herecurr);
1579                 }
1580
1581 # ignore non-hunk lines and lines being removed
1582                 next if (!$hunk_line || $line =~ /^-/);
1583
1584 # ignore files that are being periodically imported from Linux
1585                 next if ($realfile =~ /^(linux-headers|include\/standard-headers)\//);
1586
1587 #trailing whitespace
1588                 if ($line =~ /^\+.*\015/) {
1589                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1590                         ERROR("DOS line endings\n" . $herevet);
1591
1592                 } elsif ($realfile =~ /^docs\/.+\.txt/ ||
1593                          $realfile =~ /^docs\/.+\.md/) {
1594                     if ($rawline =~ /^\+\s+$/ && $rawline !~ /^\+ {4}$/) {
1595                         # TODO: properly check we're in a code block
1596                         #       (surrounding text is 4-column aligned)
1597                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1598                         ERROR("code blocks in documentation should have " .
1599                               "empty lines with exactly 4 columns of " .
1600                               "whitespace\n" . $herevet);
1601                     }
1602                 } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
1603                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1604                         ERROR("trailing whitespace\n" . $herevet);
1605                         $rpt_cleaners = 1;
1606                 }
1607
1608 # checks for trace-events files
1609                 if ($realfile =~ /trace-events$/ && $line =~ /^\+/) {
1610                         if ($rawline =~ /%[-+ 0]*#/) {
1611                                 ERROR("Don't use '#' flag of printf format ('%#') in " .
1612                                       "trace-events, use '0x' prefix instead\n" . $herecurr);
1613                         } else {
1614                                 my $hex =
1615                                         qr/%[-+ *.0-9]*([hljztL]|ll|hh)?(x|X|"\s*PRI[xX][^"]*"?)/;
1616
1617                                 # don't consider groups splitted by [.:/ ], like 2A.20:12ab
1618                                 my $tmpline = $rawline;
1619                                 $tmpline =~ s/($hex[.:\/ ])+$hex//g;
1620
1621                                 if ($tmpline =~ /(?<!0x)$hex/) {
1622                                         ERROR("Hex numbers must be prefixed with '0x'\n" .
1623                                               $herecurr);
1624                                 }
1625                         }
1626                 }
1627
1628 # check we are in a valid source file if not then ignore this hunk
1629                 next if ($realfile !~ /$SrcFile/);
1630
1631 #90 column limit; exempt URLs, if no other words on line
1632                 if ($line =~ /^\+/ &&
1633                     !($line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
1634                     !($rawline =~ /^[^[:alnum:]]*https?:\S*$/) &&
1635                     $length > 80)
1636                 {
1637                         if ($length > 90) {
1638                                 ERROR("line over 90 characters\n" . $herecurr);
1639                         } else {
1640                                 WARN("line over 80 characters\n" . $herecurr);
1641                         }
1642                 }
1643
1644 # check for spaces before a quoted newline
1645                 if ($rawline =~ /^.*\".*\s\\n/) {
1646                         ERROR("unnecessary whitespace before a quoted newline\n" . $herecurr);
1647                 }
1648
1649 # check for adding lines without a newline.
1650                 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
1651                         ERROR("adding a line without newline at end of file\n" . $herecurr);
1652                 }
1653
1654 # check for RCS/CVS revision markers
1655                 if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|\b)/) {
1656                         ERROR("CVS style keyword markers, these will _not_ be updated\n". $herecurr);
1657                 }
1658
1659 # tabs are only allowed in assembly source code, and in
1660 # some scripts we imported from other projects.
1661                 next if ($realfile =~ /\.(s|S)$/);
1662                 next if ($realfile =~ /(checkpatch|get_maintainer|texi2pod)\.pl$/);
1663
1664                 if ($rawline =~ /^\+.*\t/) {
1665                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1666                         ERROR("code indent should never use tabs\n" . $herevet);
1667                         $rpt_cleaners = 1;
1668                 }
1669
1670 # check we are in a valid C source file if not then ignore this hunk
1671                 next if ($realfile !~ /\.(h|c|cpp)$/);
1672
1673 # Block comment styles
1674
1675                 # Block comments use /* on a line of its own
1676                 if ($rawline !~ m@^\+.*/\*.*\*/[ \t)}]*$@ &&    #inline /*...*/
1677                     $rawline =~ m@^\+.*/\*\*?+[ \t]*[^ \t]@) { # /* or /** non-blank
1678                         WARN("Block comments use a leading /* on a separate line\n" . $herecurr);
1679                 }
1680
1681 # Block comments use * on subsequent lines
1682                 if ($prevline =~ /$;[ \t]*$/ &&                 #ends in comment
1683                     $prevrawline =~ /^\+.*?\/\*/ &&             #starting /*
1684                     $prevrawline !~ /\*\/[ \t]*$/ &&            #no trailing */
1685                     $rawline =~ /^\+/ &&                        #line is new
1686                     $rawline !~ /^\+[ \t]*\*/) {                #no leading *
1687                         WARN("Block comments use * on subsequent lines\n" . $hereprev);
1688                 }
1689
1690 # Block comments use */ on trailing lines
1691                 if ($rawline !~ m@^\+[ \t]*\*/[ \t]*$@ &&       #trailing */
1692                     $rawline !~ m@^\+.*/\*.*\*/[ \t]*$@ &&      #inline /*...*/
1693                     $rawline !~ m@^\+.*\*{2,}/[ \t]*$@ &&       #trailing **/
1694                     $rawline =~ m@^\+[ \t]*.+\*\/[ \t]*$@) {    #non blank */
1695                         WARN("Block comments use a trailing */ on a separate line\n" . $herecurr);
1696                 }
1697
1698 # Block comment * alignment
1699                 if ($prevline =~ /$;[ \t]*$/ &&                 #ends in comment
1700                     $line =~ /^\+[ \t]*$;/ &&                   #leading comment
1701                     $rawline =~ /^\+[ \t]*\*/ &&                #leading *
1702                     (($prevrawline =~ /^\+.*?\/\*/ &&           #leading /*
1703                       $prevrawline !~ /\*\/[ \t]*$/) ||         #no trailing */
1704                      $prevrawline =~ /^\+[ \t]*\*/)) {          #leading *
1705                         my $oldindent;
1706                         $prevrawline =~ m@^\+([ \t]*/?)\*@;
1707                         if (defined($1)) {
1708                                 $oldindent = expand_tabs($1);
1709                         } else {
1710                                 $prevrawline =~ m@^\+(.*/?)\*@;
1711                                 $oldindent = expand_tabs($1);
1712                         }
1713                         $rawline =~ m@^\+([ \t]*)\*@;
1714                         my $newindent = $1;
1715                         $newindent = expand_tabs($newindent);
1716                         if (length($oldindent) ne length($newindent)) {
1717                                 WARN("Block comments should align the * on each line\n" . $hereprev);
1718                         }
1719                 }
1720
1721 # Check for potential 'bare' types
1722                 my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
1723                     $realline_next);
1724                 if ($realcnt && $line =~ /.\s*\S/) {
1725                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1726                                 ctx_statement_block($linenr, $realcnt, 0);
1727                         $stat =~ s/\n./\n /g;
1728                         $cond =~ s/\n./\n /g;
1729
1730                         # Find the real next line.
1731                         $realline_next = $line_nr_next;
1732                         if (defined $realline_next &&
1733                             (!defined $lines[$realline_next - 1] ||
1734                              substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
1735                                 $realline_next++;
1736                         }
1737
1738                         my $s = $stat;
1739                         $s =~ s/{.*$//s;
1740
1741                         # Ignore goto labels.
1742                         if ($s =~ /$Ident:\*$/s) {
1743
1744                         # Ignore functions being called
1745                         } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
1746
1747                         } elsif ($s =~ /^.\s*else\b/s) {
1748
1749                         # declarations always start with types
1750                         } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
1751                                 my $type = $1;
1752                                 $type =~ s/\s+/ /g;
1753                                 possible($type, "A:" . $s);
1754
1755                         # definitions in global scope can only start with types
1756                         } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
1757                                 possible($1, "B:" . $s);
1758                         }
1759
1760                         # any (foo ... *) is a pointer cast, and foo is a type
1761                         while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
1762                                 possible($1, "C:" . $s);
1763                         }
1764
1765                         # Check for any sort of function declaration.
1766                         # int foo(something bar, other baz);
1767                         # void (*store_gdt)(x86_descr_ptr *);
1768                         if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
1769                                 my ($name_len) = length($1);
1770
1771                                 my $ctx = $s;
1772                                 substr($ctx, 0, $name_len + 1, '');
1773                                 $ctx =~ s/\)[^\)]*$//;
1774
1775                                 for my $arg (split(/\s*,\s*/, $ctx)) {
1776                                         if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
1777
1778                                                 possible($1, "D:" . $s);
1779                                         }
1780                                 }
1781                         }
1782
1783                 }
1784
1785 #
1786 # Checks which may be anchored in the context.
1787 #
1788
1789 # Check for switch () and associated case and default
1790 # statements should be at the same indent.
1791                 if ($line=~/\bswitch\s*\(.*\)/) {
1792                         my $err = '';
1793                         my $sep = '';
1794                         my @ctx = ctx_block_outer($linenr, $realcnt);
1795                         shift(@ctx);
1796                         for my $ctx (@ctx) {
1797                                 my ($clen, $cindent) = line_stats($ctx);
1798                                 if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
1799                                                         $indent != $cindent) {
1800                                         $err .= "$sep$ctx\n";
1801                                         $sep = '';
1802                                 } else {
1803                                         $sep = "[...]\n";
1804                                 }
1805                         }
1806                         if ($err ne '') {
1807                                 ERROR("switch and case should be at the same indent\n$hereline$err");
1808                         }
1809                 }
1810
1811 # if/while/etc brace do not go on next line, unless defining a do while loop,
1812 # or if that brace on the next line is for something else
1813                 if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
1814                         my $pre_ctx = "$1$2";
1815
1816                         my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
1817                         my $ctx_cnt = $realcnt - $#ctx - 1;
1818                         my $ctx = join("\n", @ctx);
1819
1820                         my $ctx_ln = $linenr;
1821                         my $ctx_skip = $realcnt;
1822
1823                         while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
1824                                         defined $lines[$ctx_ln - 1] &&
1825                                         $lines[$ctx_ln - 1] =~ /^-/)) {
1826                                 ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
1827                                 $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
1828                                 $ctx_ln++;
1829                         }
1830
1831                         #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
1832                         #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
1833
1834                         # The length of the "previous line" is checked against 80 because it
1835                         # includes the + at the beginning of the line (if the actual line has
1836                         # 79 or 80 characters, it is no longer possible to add a space and an
1837                         # opening brace there)
1838                         if ($#ctx == 0 && $ctx !~ /{\s*/ &&
1839                             defined($lines[$ctx_ln - 1]) && $lines[$ctx_ln - 1] =~ /^\+\s*\{/ &&
1840                             defined($lines[$ctx_ln - 2]) && length($lines[$ctx_ln - 2]) < 80) {
1841                                 ERROR("that open brace { should be on the previous line\n" .
1842                                         "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1843                         }
1844                         if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
1845                             $ctx =~ /\)\s*\;\s*$/ &&
1846                             defined $lines[$ctx_ln - 1])
1847                         {
1848                                 my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
1849                                 if ($nindent > $indent) {
1850                                         ERROR("trailing semicolon indicates no statements, indent implies otherwise\n" .
1851                                                 "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1852                                 }
1853                         }
1854                 }
1855
1856 # 'do ... while (0/false)' only makes sense in macros, without trailing ';'
1857                 if ($line =~ /while\s*\((0|false)\);/) {
1858                         ERROR("suspicious ; after while (0)\n" . $herecurr);
1859                 }
1860
1861 # Check superfluous trailing ';'
1862                 if ($line =~ /;;$/) {
1863                         ERROR("superfluous trailing semicolon\n" . $herecurr);
1864                 }
1865
1866 # Check relative indent for conditionals and blocks.
1867                 if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
1868                         my ($s, $c) = ($stat, $cond);
1869
1870                         substr($s, 0, length($c), '');
1871
1872                         # Make sure we remove the line prefixes as we have
1873                         # none on the first line, and are going to readd them
1874                         # where necessary.
1875                         $s =~ s/\n./\n/gs;
1876
1877                         # Find out how long the conditional actually is.
1878                         my @newlines = ($c =~ /\n/gs);
1879                         my $cond_lines = 1 + $#newlines;
1880
1881                         # We want to check the first line inside the block
1882                         # starting at the end of the conditional, so remove:
1883                         #  1) any blank line termination
1884                         #  2) any opening brace { on end of the line
1885                         #  3) any do (...) {
1886                         my $continuation = 0;
1887                         my $check = 0;
1888                         $s =~ s/^.*\bdo\b//;
1889                         $s =~ s/^\s*\{//;
1890                         if ($s =~ s/^\s*\\//) {
1891                                 $continuation = 1;
1892                         }
1893                         if ($s =~ s/^\s*?\n//) {
1894                                 $check = 1;
1895                                 $cond_lines++;
1896                         }
1897
1898                         # Also ignore a loop construct at the end of a
1899                         # preprocessor statement.
1900                         if (($prevline =~ /^.\s*#\s*define\s/ ||
1901                             $prevline =~ /\\\s*$/) && $continuation == 0) {
1902                                 $check = 0;
1903                         }
1904
1905                         my $cond_ptr = -1;
1906                         $continuation = 0;
1907                         while ($cond_ptr != $cond_lines) {
1908                                 $cond_ptr = $cond_lines;
1909
1910                                 # If we see an #else/#elif then the code
1911                                 # is not linear.
1912                                 if ($s =~ /^\s*\#\s*(?:else|elif)/) {
1913                                         $check = 0;
1914                                 }
1915
1916                                 # Ignore:
1917                                 #  1) blank lines, they should be at 0,
1918                                 #  2) preprocessor lines, and
1919                                 #  3) labels.
1920                                 if ($continuation ||
1921                                     $s =~ /^\s*?\n/ ||
1922                                     $s =~ /^\s*#\s*?/ ||
1923                                     $s =~ /^\s*$Ident\s*:/) {
1924                                         $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
1925                                         if ($s =~ s/^.*?\n//) {
1926                                                 $cond_lines++;
1927                                         }
1928                                 }
1929                         }
1930
1931                         my (undef, $sindent) = line_stats("+" . $s);
1932                         my $stat_real = raw_line($linenr, $cond_lines);
1933
1934                         # Check if either of these lines are modified, else
1935                         # this is not this patch's fault.
1936                         if (!defined($stat_real) ||
1937                             $stat !~ /^\+/ && $stat_real !~ /^\+/) {
1938                                 $check = 0;
1939                         }
1940                         if (defined($stat_real) && $cond_lines > 1) {
1941                                 $stat_real = "[...]\n$stat_real";
1942                         }
1943
1944                         #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";
1945
1946                         if ($check && (($sindent % 4) != 0 ||
1947                             ($sindent <= $indent && $s ne ''))) {
1948                                 ERROR("suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
1949                         }
1950                 }
1951
1952                 # Track the 'values' across context and added lines.
1953                 my $opline = $line; $opline =~ s/^./ /;
1954                 my ($curr_values, $curr_vars) =
1955                                 annotate_values($opline . "\n", $prev_values);
1956                 $curr_values = $prev_values . $curr_values;
1957                 if ($dbg_values) {
1958                         my $outline = $opline; $outline =~ s/\t/ /g;
1959                         print "$linenr > .$outline\n";
1960                         print "$linenr > $curr_values\n";
1961                         print "$linenr >  $curr_vars\n";
1962                 }
1963                 $prev_values = substr($curr_values, -1);
1964
1965 #ignore lines not being added
1966                 if ($line=~/^[^\+]/) {next;}
1967
1968 # TEST: allow direct testing of the type matcher.
1969                 if ($dbg_type) {
1970                         if ($line =~ /^.\s*$Declare\s*$/) {
1971                                 ERROR("TEST: is type\n" . $herecurr);
1972                         } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
1973                                 ERROR("TEST: is not type ($1 is)\n". $herecurr);
1974                         }
1975                         next;
1976                 }
1977 # TEST: allow direct testing of the attribute matcher.
1978                 if ($dbg_attr) {
1979                         if ($line =~ /^.\s*$Modifier\s*$/) {
1980                                 ERROR("TEST: is attr\n" . $herecurr);
1981                         } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
1982                                 ERROR("TEST: is not attr ($1 is)\n". $herecurr);
1983                         }
1984                         next;
1985                 }
1986
1987 # check for initialisation to aggregates open brace on the next line
1988                 if ($line =~ /^.\s*\{/ &&
1989                     $prevline =~ /(?:^|[^=])=\s*$/) {
1990                         ERROR("that open brace { should be on the previous line\n" . $hereprev);
1991                 }
1992
1993 #
1994 # Checks which are anchored on the added line.
1995 #
1996
1997 # check for malformed paths in #include statements (uses RAW line)
1998                 if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
1999                         my $path = $1;
2000                         if ($path =~ m{//}) {
2001                                 ERROR("malformed #include filename\n" .
2002                                         $herecurr);
2003                         }
2004                 }
2005
2006 # no C99 // comments
2007                 if ($line =~ m{//} &&
2008                     $rawline !~ m{// SPDX-License-Identifier: }) {
2009                         ERROR("do not use C99 // comments\n" . $herecurr);
2010                 }
2011                 # Remove C99 comments.
2012                 $line =~ s@//.*@@;
2013                 $opline =~ s@//.*@@;
2014
2015 # check for global initialisers.
2016                 if ($line =~ /^.$Type\s*$Ident\s*(?:\s+$Modifier)*\s*=\s*(0|NULL|false)\s*;/) {
2017                         ERROR("do not initialise globals to 0 or NULL\n" .
2018                                 $herecurr);
2019                 }
2020 # check for static initialisers.
2021                 if ($line =~ /\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
2022                         ERROR("do not initialise statics to 0 or NULL\n" .
2023                                 $herecurr);
2024                 }
2025
2026 # * goes on variable not on type
2027                 # (char*[ const])
2028                 if ($line =~ m{\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\)}) {
2029                         my ($from, $to) = ($1, $1);
2030
2031                         # Should start with a space.
2032                         $to =~ s/^(\S)/ $1/;
2033                         # Should not end with a space.
2034                         $to =~ s/\s+$//;
2035                         # '*'s should not have spaces between.
2036                         while ($to =~ s/\*\s+\*/\*\*/) {
2037                         }
2038
2039                         #print "from<$from> to<$to>\n";
2040                         if ($from ne $to) {
2041                                 ERROR("\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr);
2042                         }
2043                 } elsif ($line =~ m{\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident)}) {
2044                         my ($from, $to, $ident) = ($1, $1, $2);
2045
2046                         # Should start with a space.
2047                         $to =~ s/^(\S)/ $1/;
2048                         # Should not end with a space.
2049                         $to =~ s/\s+$//;
2050                         # '*'s should not have spaces between.
2051                         while ($to =~ s/\*\s+\*/\*\*/) {
2052                         }
2053                         # Modifiers should have spaces.
2054                         $to =~ s/(\b$Modifier$)/$1 /;
2055
2056                         #print "from<$from> to<$to> ident<$ident>\n";
2057                         if ($from ne $to && $ident !~ /^$Modifier$/) {
2058                                 ERROR("\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr);
2059                         }
2060                 }
2061
2062 # function brace can't be on same line, except for #defines of do while,
2063 # or if closed on same line
2064                 if (($line=~/$Type\s*$Ident\(.*\).*\s\{/) and
2065                     !($line=~/\#\s*define.*do\s\{/) and !($line=~/}/)) {
2066                         ERROR("open brace '{' following function declarations go on the next line\n" . $herecurr);
2067                 }
2068
2069 # open braces for enum, union and struct go on the same line.
2070                 if ($line =~ /^.\s*\{/ &&
2071                     $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
2072                         ERROR("open brace '{' following $1 go on the same line\n" . $hereprev);
2073                 }
2074
2075 # missing space after union, struct or enum definition
2076                 if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?(?:\s+$Ident)?[=\{]/) {
2077                     ERROR("missing space after $1 definition\n" . $herecurr);
2078                 }
2079
2080 # check for spacing round square brackets; allowed:
2081 #  1. with a type on the left -- int [] a;
2082 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
2083 #  3. inside a curly brace -- = { [0...10] = 5 }
2084 #  4. after a comma -- [1] = 5, [2] = 6
2085 #  5. in a macro definition -- #define abc(x) [x] = y
2086                 while ($line =~ /(.*?\s)\[/g) {
2087                         my ($where, $prefix) = ($-[1], $1);
2088                         if ($prefix !~ /$Type\s+$/ &&
2089                             ($where != 0 || $prefix !~ /^.\s+$/) &&
2090                             $prefix !~ /\#\s*define[^(]*\([^)]*\)\s+$/ &&
2091                             $prefix !~ /[,{:]\s+$/) {
2092                                 ERROR("space prohibited before open square bracket '['\n" . $herecurr);
2093                         }
2094                 }
2095
2096 # check for spaces between functions and their parentheses.
2097                 while ($line =~ /($Ident)\s+\(/g) {
2098                         my $name = $1;
2099                         my $ctx_before = substr($line, 0, $-[1]);
2100                         my $ctx = "$ctx_before$name";
2101
2102                         # Ignore those directives where spaces _are_ permitted.
2103                         if ($name =~ /^(?:
2104                                 if|for|while|switch|return|case|
2105                                 volatile|__volatile__|coroutine_fn|
2106                                 __attribute__|format|__extension__|
2107                                 asm|__asm__)$/x)
2108                         {
2109
2110                         # Ignore 'catch (...)' in C++
2111                         } elsif ($name =~ /^catch$/ && $realfile =~ /(\.cpp|\.h)$/) {
2112
2113                         # cpp #define statements have non-optional spaces, ie
2114                         # if there is a space between the name and the open
2115                         # parenthesis it is simply not a parameter group.
2116                         } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
2117
2118                         # cpp #elif statement condition may start with a (
2119                         } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
2120
2121                         # If this whole things ends with a type its most
2122                         # likely a typedef for a function.
2123                         } elsif ($ctx =~ /$Type$/) {
2124
2125                         } else {
2126                                 ERROR("space prohibited between function name and open parenthesis '('\n" . $herecurr);
2127                         }
2128                 }
2129 # Check operator spacing.
2130                 if (!($line=~/\#\s*include/)) {
2131                         my $ops = qr{
2132                                 <<=|>>=|<=|>=|==|!=|
2133                                 \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
2134                                 =>|->|<<|>>|<|>|=|!|~|
2135                                 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
2136                                 \?|::|:
2137                         }x;
2138                         my @elements = split(/($ops|;)/, $opline);
2139                         my $off = 0;
2140
2141                         my $blank = copy_spacing($opline);
2142
2143                         for (my $n = 0; $n < $#elements; $n += 2) {
2144                                 $off += length($elements[$n]);
2145
2146                                 # Pick up the preceding and succeeding characters.
2147                                 my $ca = substr($opline, 0, $off);
2148                                 my $cc = '';
2149                                 if (length($opline) >= ($off + length($elements[$n + 1]))) {
2150                                         $cc = substr($opline, $off + length($elements[$n + 1]));
2151                                 }
2152                                 my $cb = "$ca$;$cc";
2153
2154                                 my $a = '';
2155                                 $a = 'V' if ($elements[$n] ne '');
2156                                 $a = 'W' if ($elements[$n] =~ /\s$/);
2157                                 $a = 'C' if ($elements[$n] =~ /$;$/);
2158                                 $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
2159                                 $a = 'O' if ($elements[$n] eq '');
2160                                 $a = 'E' if ($ca =~ /^\s*$/);
2161
2162                                 my $op = $elements[$n + 1];
2163
2164                                 my $c = '';
2165                                 if (defined $elements[$n + 2]) {
2166                                         $c = 'V' if ($elements[$n + 2] ne '');
2167                                         $c = 'W' if ($elements[$n + 2] =~ /^\s/);
2168                                         $c = 'C' if ($elements[$n + 2] =~ /^$;/);
2169                                         $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
2170                                         $c = 'O' if ($elements[$n + 2] eq '');
2171                                         $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
2172                                 } else {
2173                                         $c = 'E';
2174                                 }
2175
2176                                 my $ctx = "${a}x${c}";
2177
2178                                 my $at = "(ctx:$ctx)";
2179
2180                                 my $ptr = substr($blank, 0, $off) . "^";
2181                                 my $hereptr = "$hereline$ptr\n";
2182
2183                                 # Pull out the value of this operator.
2184                                 my $op_type = substr($curr_values, $off + 1, 1);
2185
2186                                 # Get the full operator variant.
2187                                 my $opv = $op . substr($curr_vars, $off, 1);
2188
2189                                 # Ignore operators passed as parameters.
2190                                 if ($op_type ne 'V' &&
2191                                     $ca =~ /\s$/ && $cc =~ /^\s*,/) {
2192
2193 #                               # Ignore comments
2194 #                               } elsif ($op =~ /^$;+$/) {
2195
2196                                 # ; should have either the end of line or a space or \ after it
2197                                 } elsif ($op eq ';') {
2198                                         if ($ctx !~ /.x[WEBC]/ &&
2199                                             $cc !~ /^\\/ && $cc !~ /^;/) {
2200                                                 ERROR("space required after that '$op' $at\n" . $hereptr);
2201                                         }
2202
2203                                 # // is a comment
2204                                 } elsif ($op eq '//') {
2205
2206                                 # Ignore : used in class declaration in C++
2207                                 } elsif ($opv eq ':B' && $ctx =~ /Wx[WE]/ &&
2208                                                  $line =~ /class/ && $realfile =~ /(\.cpp|\.h)$/) {
2209
2210                                 # No spaces for:
2211                                 #   ->
2212                                 #   :   when part of a bitfield
2213                                 } elsif ($op eq '->' || $opv eq ':B') {
2214                                         if ($ctx =~ /Wx.|.xW/) {
2215                                                 ERROR("spaces prohibited around that '$op' $at\n" . $hereptr);
2216                                         }
2217
2218                                 # , must have a space on the right.
2219                                 # not required when having a single },{ on one line
2220                                 } elsif ($op eq ',') {
2221                                         if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/ &&
2222                                             ($elements[$n] . $elements[$n + 2]) !~ " *}\\{") {
2223                                                 ERROR("space required after that '$op' $at\n" . $hereptr);
2224                                         }
2225
2226                                 # '*' as part of a type definition -- reported already.
2227                                 } elsif ($opv eq '*_') {
2228                                         #warn "'*' is part of type\n";
2229
2230                                 # unary operators should have a space before and
2231                                 # none after.  May be left adjacent to another
2232                                 # unary operator, or a cast
2233                                 } elsif ($op eq '!' || $op eq '~' ||
2234                                          $opv eq '*U' || $opv eq '-U' ||
2235                                          $opv eq '&U' || $opv eq '&&U') {
2236                                         if ($op eq '~' && $ca =~ /::$/ && $realfile =~ /(\.cpp|\.h)$/) {
2237                                                 # '~' used as a name of Destructor
2238
2239                                         } elsif ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
2240                                                 ERROR("space required before that '$op' $at\n" . $hereptr);
2241                                         }
2242                                         if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
2243                                                 # A unary '*' may be const
2244
2245                                         } elsif ($ctx =~ /.xW/) {
2246                                                 ERROR("space prohibited after that '$op' $at\n" . $hereptr);
2247                                         }
2248
2249                                 # unary ++ and unary -- are allowed no space on one side.
2250                                 } elsif ($op eq '++' or $op eq '--') {
2251                                         if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
2252                                                 ERROR("space required one side of that '$op' $at\n" . $hereptr);
2253                                         }
2254                                         if ($ctx =~ /Wx[BE]/ ||
2255                                             ($ctx =~ /Wx./ && $cc =~ /^;/)) {
2256                                                 ERROR("space prohibited before that '$op' $at\n" . $hereptr);
2257                                         }
2258                                         if ($ctx =~ /ExW/) {
2259                                                 ERROR("space prohibited after that '$op' $at\n" . $hereptr);
2260                                         }
2261
2262                                 # A colon needs no spaces before when it is
2263                                 # terminating a case value or a label.
2264                                 } elsif ($opv eq ':C' || $opv eq ':L') {
2265                                         if ($ctx =~ /Wx./) {
2266                                                 ERROR("space prohibited before that '$op' $at\n" . $hereptr);
2267                                         }
2268
2269                                 # All the others need spaces both sides.
2270                                 } elsif ($ctx !~ /[EWC]x[CWE]/) {
2271                                         my $ok = 0;
2272
2273                                         if ($realfile =~ /\.cpp|\.h$/) {
2274                                                 # Ignore template arguments <...> in C++
2275                                                 if (($op eq '<' || $op eq '>') && $line =~ /<.*>/) {
2276                                                         $ok = 1;
2277                                                 }
2278
2279                                                 # Ignore :: in C++
2280                                                 if ($op eq '::') {
2281                                                         $ok = 1;
2282                                                 }
2283                                         }
2284
2285                                         # Ignore email addresses <foo@bar>
2286                                         if (($op eq '<' &&
2287                                              $cc =~ /^\S+\@\S+>/) ||
2288                                             ($op eq '>' &&
2289                                              $ca =~ /<\S+\@\S+$/))
2290                                         {
2291                                                 $ok = 1;
2292                                         }
2293
2294                                         # Ignore ?:
2295                                         if (($opv eq ':O' && $ca =~ /\?$/) ||
2296                                             ($op eq '?' && $cc =~ /^:/)) {
2297                                                 $ok = 1;
2298                                         }
2299
2300                                         if ($ok == 0) {
2301                                                 ERROR("spaces required around that '$op' $at\n" . $hereptr);
2302                                         }
2303                                 }
2304                                 $off += length($elements[$n + 1]);
2305                         }
2306                 }
2307
2308 #need space before brace following if, while, etc
2309                 if (($line =~ /\(.*\)\{/ && $line !~ /\($Type\)\{/) ||
2310                     $line =~ /do\{/) {
2311                         ERROR("space required before the open brace '{'\n" . $herecurr);
2312                 }
2313
2314 # closing brace should have a space following it when it has anything
2315 # on the line
2316                 if ($line =~ /}(?!(?:,|;|\)))\S/) {
2317                         ERROR("space required after that close brace '}'\n" . $herecurr);
2318                 }
2319
2320 # check spacing on square brackets
2321                 if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
2322                         ERROR("space prohibited after that open square bracket '['\n" . $herecurr);
2323                 }
2324                 if ($line =~ /\s\]/) {
2325                         ERROR("space prohibited before that close square bracket ']'\n" . $herecurr);
2326                 }
2327
2328 # check spacing on parentheses
2329                 if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
2330                     $line !~ /for\s*\(\s+;/) {
2331                         ERROR("space prohibited after that open parenthesis '('\n" . $herecurr);
2332                 }
2333                 if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
2334                     $line !~ /for\s*\(.*;\s+\)/ &&
2335                     $line !~ /:\s+\)/) {
2336                         ERROR("space prohibited before that close parenthesis ')'\n" . $herecurr);
2337                 }
2338
2339 # Return is not a function.
2340                 if (defined($stat) && $stat =~ /^.\s*return(\s*)(\(.*);/s) {
2341                         my $spacing = $1;
2342                         my $value = $2;
2343
2344                         # Flatten any parentheses
2345                         $value =~ s/\(/ \(/g;
2346                         $value =~ s/\)/\) /g;
2347                         while ($value =~ s/\[[^\{\}]*\]/1/ ||
2348                                $value !~ /(?:$Ident|-?$Constant)\s*
2349                                              $Compare\s*
2350                                              (?:$Ident|-?$Constant)/x &&
2351                                $value =~ s/\([^\(\)]*\)/1/) {
2352                         }
2353 #print "value<$value>\n";
2354                         if ($value =~ /^\s*(?:$Ident|-?$Constant)\s*$/ &&
2355                             $line =~ /;$/) {
2356                                 ERROR("return is not a function, parentheses are not required\n" . $herecurr);
2357
2358                         } elsif ($spacing !~ /\s+/) {
2359                                 ERROR("space required before the open parenthesis '('\n" . $herecurr);
2360                         }
2361                 }
2362 # Return of what appears to be an errno should normally be -'ve
2363                 if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
2364                         my $name = $1;
2365                         if ($name ne 'EOF' && $name ne 'ERROR') {
2366                                 ERROR("return of an errno should typically be -ve (return -$1)\n" . $herecurr);
2367                         }
2368                 }
2369
2370                 if ($line =~ /^.\s*(Q(?:S?LIST|SIMPLEQ|TAILQ)_HEAD)\s*\(\s*[^,]/ &&
2371                     $line !~ /^.typedef/) {
2372                     ERROR("named $1 should be typedefed separately\n" . $herecurr);
2373                 }
2374
2375 # Need a space before open parenthesis after if, while etc
2376                 if ($line=~/\b(if|while|for|switch)\(/) {
2377                         ERROR("space required before the open parenthesis '('\n" . $herecurr);
2378                 }
2379
2380 # Check for illegal assignment in if conditional -- and check for trailing
2381 # statements after the conditional.
2382                 if ($line =~ /do\s*(?!{)/) {
2383                         my ($stat_next) = ctx_statement_block($line_nr_next,
2384                                                 $remain_next, $off_next);
2385                         $stat_next =~ s/\n./\n /g;
2386                         ##print "stat<$stat> stat_next<$stat_next>\n";
2387
2388                         if ($stat_next =~ /^\s*while\b/) {
2389                                 # If the statement carries leading newlines,
2390                                 # then count those as offsets.
2391                                 my ($whitespace) =
2392                                         ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
2393                                 my $offset =
2394                                         statement_rawlines($whitespace) - 1;
2395
2396                                 $suppress_whiletrailers{$line_nr_next +
2397                                                                 $offset} = 1;
2398                         }
2399                 }
2400                 if (!defined $suppress_whiletrailers{$linenr} &&
2401                     $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
2402                         my ($s, $c) = ($stat, $cond);
2403
2404                         if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
2405                                 ERROR("do not use assignment in if condition\n" . $herecurr);
2406                         }
2407
2408                         # Find out what is on the end of the line after the
2409                         # conditional.
2410                         substr($s, 0, length($c), '');
2411                         $s =~ s/\n.*//g;
2412                         $s =~ s/$;//g;  # Remove any comments
2413                         if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
2414                             $c !~ /}\s*while\s*/)
2415                         {
2416                                 # Find out how long the conditional actually is.
2417                                 my @newlines = ($c =~ /\n/gs);
2418                                 my $cond_lines = 1 + $#newlines;
2419                                 my $stat_real = '';
2420
2421                                 $stat_real = raw_line($linenr, $cond_lines)
2422                                                         . "\n" if ($cond_lines);
2423                                 if (defined($stat_real) && $cond_lines > 1) {
2424                                         $stat_real = "[...]\n$stat_real";
2425                                 }
2426
2427                                 ERROR("trailing statements should be on next line\n" . $herecurr . $stat_real);
2428                         }
2429                 }
2430
2431 # Check for bitwise tests written as boolean
2432                 if ($line =~ /
2433                         (?:
2434                                 (?:\[|\(|\&\&|\|\|)
2435                                 \s*0[xX][0-9]+\s*
2436                                 (?:\&\&|\|\|)
2437                         |
2438                                 (?:\&\&|\|\|)
2439                                 \s*0[xX][0-9]+\s*
2440                                 (?:\&\&|\|\||\)|\])
2441                         )/x)
2442                 {
2443                         ERROR("boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
2444                 }
2445
2446 # if and else should not have general statements after it
2447                 if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
2448                         my $s = $1;
2449                         $s =~ s/$;//g;  # Remove any comments
2450                         if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
2451                                 ERROR("trailing statements should be on next line\n" . $herecurr);
2452                         }
2453                 }
2454 # if should not continue a brace
2455                 if ($line =~ /}\s*if\b/) {
2456                         ERROR("trailing statements should be on next line\n" .
2457                                 $herecurr);
2458                 }
2459 # case and default should not have general statements after them
2460                 if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
2461                     $line !~ /\G(?:
2462                         (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
2463                         \s*return\s+
2464                     )/xg)
2465                 {
2466                         ERROR("trailing statements should be on next line\n" . $herecurr);
2467                 }
2468
2469                 # Check for }<nl>else {, these must be at the same
2470                 # indent level to be relevant to each other.
2471                 if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
2472                                                 $previndent == $indent) {
2473                         ERROR("else should follow close brace '}'\n" . $hereprev);
2474                 }
2475
2476                 if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and
2477                                                 $previndent == $indent) {
2478                         my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
2479
2480                         # Find out what is on the end of the line after the
2481                         # conditional.
2482                         substr($s, 0, length($c), '');
2483                         $s =~ s/\n.*//g;
2484
2485                         if ($s =~ /^\s*;/) {
2486                                 ERROR("while should follow close brace '}'\n" . $hereprev);
2487                         }
2488                 }
2489
2490 #studly caps, commented out until figure out how to distinguish between use of existing and adding new
2491 #               if (($line=~/[\w_][a-z\d]+[A-Z]/) and !($line=~/print/)) {
2492 #                   print "No studly caps, use _\n";
2493 #                   print "$herecurr";
2494 #                   $clean = 0;
2495 #               }
2496
2497 #no spaces allowed after \ in define
2498                 if ($line=~/\#\s*define.*\\\s$/) {
2499                         ERROR("Whitespace after \\ makes next lines useless\n" . $herecurr);
2500                 }
2501
2502 # multi-statement macros should be enclosed in a do while loop, grab the
2503 # first statement and ensure its the whole macro if its not enclosed
2504 # in a known good container
2505                 if ($realfile !~ m@/vmlinux.lds.h$@ &&
2506                     $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
2507                         my $ln = $linenr;
2508                         my $cnt = $realcnt;
2509                         my ($off, $dstat, $dcond, $rest);
2510                         my $ctx = '';
2511
2512                         my $args = defined($1);
2513
2514                         # Find the end of the macro and limit our statement
2515                         # search to that.
2516                         while ($cnt > 0 && defined $lines[$ln - 1] &&
2517                                 $lines[$ln - 1] =~ /^(?:-|..*\\$)/)
2518                         {
2519                                 $ctx .= $rawlines[$ln - 1] . "\n";
2520                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
2521                                 $ln++;
2522                         }
2523                         $ctx .= $rawlines[$ln - 1];
2524
2525                         ($dstat, $dcond, $ln, $cnt, $off) =
2526                                 ctx_statement_block($linenr, $ln - $linenr + 1, 0);
2527                         #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
2528                         #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
2529
2530                         # Extract the remainder of the define (if any) and
2531                         # rip off surrounding spaces, and trailing \'s.
2532                         $rest = '';
2533                         while ($off != 0 || ($cnt > 0 && $rest =~ /\\\s*$/)) {
2534                                 #print "ADDING cnt<$cnt> $off <" . substr($lines[$ln - 1], $off) . "> rest<$rest>\n";
2535                                 if ($off != 0 || $lines[$ln - 1] !~ /^-/) {
2536                                         $rest .= substr($lines[$ln - 1], $off) . "\n";
2537                                         $cnt--;
2538                                 }
2539                                 $ln++;
2540                                 $off = 0;
2541                         }
2542                         $rest =~ s/\\\n.//g;
2543                         $rest =~ s/^\s*//s;
2544                         $rest =~ s/\s*$//s;
2545
2546                         # Clean up the original statement.
2547                         if ($args) {
2548                                 substr($dstat, 0, length($dcond), '');
2549                         } else {
2550                                 $dstat =~ s/^.\s*\#\s*define\s+$Ident\s*//;
2551                         }
2552                         $dstat =~ s/$;//g;
2553                         $dstat =~ s/\\\n.//g;
2554                         $dstat =~ s/^\s*//s;
2555                         $dstat =~ s/\s*$//s;
2556
2557                         # Flatten any parentheses and braces
2558                         while ($dstat =~ s/\([^\(\)]*\)/1/ ||
2559                                $dstat =~ s/\{[^\{\}]*\}/1/ ||
2560                                $dstat =~ s/\[[^\{\}]*\]/1/)
2561                         {
2562                         }
2563
2564                         my $exceptions = qr{
2565                                 $Declare|
2566                                 module_param_named|
2567                                 MODULE_PARAM_DESC|
2568                                 DECLARE_PER_CPU|
2569                                 DEFINE_PER_CPU|
2570                                 __typeof__\(|
2571                                 union|
2572                                 struct|
2573                                 \.$Ident\s*=\s*|
2574                                 ^\"|\"$
2575                         }x;
2576                         #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
2577                         if ($rest ne '' && $rest ne ',') {
2578                                 if ($rest !~ /while\s*\(/ &&
2579                                     $dstat !~ /$exceptions/)
2580                                 {
2581                                         ERROR("Macros with multiple statements should be enclosed in a do - while loop\n" . "$here\n$ctx\n");
2582                                 }
2583
2584                         } elsif ($ctx !~ /;/) {
2585                                 if ($dstat ne '' &&
2586                                     $dstat !~ /^(?:$Ident|-?$Constant)$/ &&
2587                                     $dstat !~ /$exceptions/ &&
2588                                     $dstat !~ /^\.$Ident\s*=/ &&
2589                                     $dstat =~ /$Operators/)
2590                                 {
2591                                         ERROR("Macros with complex values should be enclosed in parenthesis\n" . "$here\n$ctx\n");
2592                                 }
2593                         }
2594                 }
2595
2596 # check for missing bracing around if etc
2597                 if ($line =~ /(^.*)\b(?:if|while|for)\b/ &&
2598                         $line !~ /\#\s*if/) {
2599                         my $allowed = 0;
2600
2601                         # Check the pre-context.
2602                         if ($line =~ /(\}.*?)$/) {
2603                                 my $pre = $1;
2604
2605                                 if ($line !~ /else/) {
2606                                         print "APW: ALLOWED: pre<$pre> line<$line>\n"
2607                                                 if $dbg_adv_apw;
2608                                         $allowed = 1;
2609                                 }
2610                         }
2611                         my ($level, $endln, @chunks) =
2612                                 ctx_statement_full($linenr, $realcnt, 1);
2613                         if ($dbg_adv_apw) {
2614                             print "APW: chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
2615                             print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n"
2616                                 if $#chunks >= 1;
2617                         }
2618                         if ($#chunks >= 0 && $level == 0) {
2619                                 my $seen = 0;
2620                                 my $herectx = $here . "\n";
2621                                 my $ln = $linenr - 1;
2622                                 for my $chunk (@chunks) {
2623                                         my ($cond, $block) = @{$chunk};
2624
2625                                         # If the condition carries leading newlines, then count those as offsets.
2626                                         my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
2627                                         my $offset = statement_rawlines($whitespace) - 1;
2628
2629                                         #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
2630
2631                                         # We have looked at and allowed this specific line.
2632                                         $suppress_ifbraces{$ln + $offset} = 1;
2633
2634                                         $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
2635                                         $ln += statement_rawlines($block) - 1;
2636
2637                                         substr($block, 0, length($cond), '');
2638
2639                                         my $spaced_block = $block;
2640                                         $spaced_block =~ s/\n\+/ /g;
2641
2642                                         $seen++ if ($spaced_block =~ /^\s*\{/);
2643
2644                                         print "APW: cond<$cond> block<$block> allowed<$allowed>\n"
2645                                             if $dbg_adv_apw;
2646                                         if (statement_lines($cond) > 1) {
2647                                             print "APW: ALLOWED: cond<$cond>\n"
2648                                                 if $dbg_adv_apw;
2649                                             $allowed = 1;
2650                                         }
2651                                         if ($block =~/\b(?:if|for|while)\b/) {
2652                                             print "APW: ALLOWED: block<$block>\n"
2653                                                 if $dbg_adv_apw;
2654                                             $allowed = 1;
2655                                         }
2656                                         if (statement_block_size($block) > 1) {
2657                                             print "APW: ALLOWED: lines block<$block>\n"
2658                                                 if $dbg_adv_apw;
2659                                             $allowed = 1;
2660                                         }
2661                                 }
2662                                 if ($seen != ($#chunks + 1) && !$allowed) {
2663                                         ERROR("braces {} are necessary for all arms of this statement\n" . $herectx);
2664                                 }
2665                         }
2666                 }
2667                 if (!defined $suppress_ifbraces{$linenr - 1} &&
2668                                         $line =~ /\b(if|while|for|else)\b/ &&
2669                                         $line !~ /\#\s*if/ &&
2670                                         $line !~ /\#\s*else/) {
2671                         my $allowed = 0;
2672
2673                         # Check the pre-context.
2674                         if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
2675                             my $pre = $1;
2676
2677                             if ($line !~ /else/) {
2678                                 print "APW: ALLOWED: pre<$pre> line<$line>\n"
2679                                     if $dbg_adv_apw;
2680                                 $allowed = 1;
2681                             }
2682                         }
2683
2684                         my ($level, $endln, @chunks) =
2685                                 ctx_statement_full($linenr, $realcnt, $-[0]);
2686
2687                         # Check the condition.
2688                         my ($cond, $block) = @{$chunks[0]};
2689                         print "CHECKING<$linenr> cond<$cond> block<$block>\n"
2690                             if $dbg_adv_checking;
2691                         if (defined $cond) {
2692                                 substr($block, 0, length($cond), '');
2693                         }
2694                         if (statement_lines($cond) > 1) {
2695                             print "APW: ALLOWED: cond<$cond>\n"
2696                                 if $dbg_adv_apw;
2697                             $allowed = 1;
2698                         }
2699                         if ($block =~/\b(?:if|for|while)\b/) {
2700                             print "APW: ALLOWED: block<$block>\n"
2701                                 if $dbg_adv_apw;
2702                             $allowed = 1;
2703                         }
2704                         if (statement_block_size($block) > 1) {
2705                             print "APW: ALLOWED: lines block<$block>\n"
2706                                 if $dbg_adv_apw;
2707                             $allowed = 1;
2708                         }
2709                         # Check the post-context.
2710                         if (defined $chunks[1]) {
2711                                 my ($cond, $block) = @{$chunks[1]};
2712                                 if (defined $cond) {
2713                                         substr($block, 0, length($cond), '');
2714                                 }
2715                                 if ($block =~ /^\s*\{/) {
2716                                     print "APW: ALLOWED: chunk-1 block<$block>\n"
2717                                         if $dbg_adv_apw;
2718                                     $allowed = 1;
2719                                 }
2720                         }
2721                         print "DCS: level=$level block<$block> allowed=$allowed\n"
2722                             if $dbg_adv_dcs;
2723                         if ($level == 0 && $block !~ /^\s*\{/ && !$allowed) {
2724                                 my $herectx = $here . "\n";;
2725                                 my $cnt = statement_rawlines($block);
2726
2727                                 for (my $n = 0; $n < $cnt; $n++) {
2728                                         $herectx .= raw_line($linenr, $n) . "\n";;
2729                                 }
2730
2731                                 ERROR("braces {} are necessary even for single statement blocks\n" . $herectx);
2732                         }
2733                 }
2734
2735 # no volatiles please
2736                 my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
2737                 if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/ &&
2738                     $line !~ /sig_atomic_t/ &&
2739                     !ctx_has_comment($first_line, $linenr)) {
2740                         my $msg = "Use of volatile is usually wrong, please add a comment\n" . $herecurr;
2741                         ERROR($msg);
2742                 }
2743
2744 # warn about #if 0
2745                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
2746                         ERROR("if this code is redundant consider removing it\n" .
2747                                 $herecurr);
2748                 }
2749
2750 # check for needless g_free() checks
2751                 if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
2752                         my $expr = $1;
2753                         if ($line =~ /\bg_free\(\Q$expr\E\);/) {
2754                                 ERROR("g_free(NULL) is safe this check is probably not required\n" . $hereprev);
2755                         }
2756                 }
2757
2758 # warn about #ifdefs in C files
2759 #               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
2760 #                       print "#ifdef in C files should be avoided\n";
2761 #                       print "$herecurr";
2762 #                       $clean = 0;
2763 #               }
2764
2765 # warn about spacing in #ifdefs
2766                 if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
2767                         ERROR("exactly one space required after that #$1\n" . $herecurr);
2768                 }
2769 # check for memory barriers without a comment.
2770                 if ($line =~ /\b(smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
2771                         if (!ctx_has_comment($first_line, $linenr)) {
2772                                 ERROR("memory barrier without comment\n" . $herecurr);
2773                         }
2774                 }
2775 # check of hardware specific defines
2776 # we have e.g. CONFIG_LINUX and CONFIG_WIN32 for common cases
2777 # where they might be necessary.
2778                 if ($line =~ m@^.\s*\#\s*if.*\b__@) {
2779                         WARN("architecture specific defines should be avoided\n" .  $herecurr);
2780                 }
2781
2782 # Check that the storage class is at the beginning of a declaration
2783                 if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
2784                         ERROR("storage class should be at the beginning of the declaration\n" . $herecurr)
2785                 }
2786
2787 # check the location of the inline attribute, that it is between
2788 # storage class and type.
2789                 if ($line =~ /\b$Type\s+$Inline\b/ ||
2790                     $line =~ /\b$Inline\s+$Storage\b/) {
2791                         ERROR("inline keyword should sit between storage class and type\n" . $herecurr);
2792                 }
2793
2794 # check for sizeof(&)
2795                 if ($line =~ /\bsizeof\s*\(\s*\&/) {
2796                         ERROR("sizeof(& should be avoided\n" . $herecurr);
2797                 }
2798
2799 # check for new externs in .c files.
2800                 if ($realfile =~ /\.c$/ && defined $stat &&
2801                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
2802                 {
2803                         my $function_name = $1;
2804                         my $paren_space = $2;
2805
2806                         my $s = $stat;
2807                         if (defined $cond) {
2808                                 substr($s, 0, length($cond), '');
2809                         }
2810                         if ($s =~ /^\s*;/ &&
2811                             $function_name ne 'uninitialized_var')
2812                         {
2813                                 ERROR("externs should be avoided in .c files\n" .  $herecurr);
2814                         }
2815
2816                         if ($paren_space =~ /\n/) {
2817                                 ERROR("arguments for function declarations should follow identifier\n" . $herecurr);
2818                         }
2819
2820                 } elsif ($realfile =~ /\.c$/ && defined $stat &&
2821                     $stat =~ /^.\s*extern\s+/)
2822                 {
2823                         ERROR("externs should be avoided in .c files\n" .  $herecurr);
2824                 }
2825
2826 # check for pointless casting of g_malloc return
2827                 if ($line =~ /\*\s*\)\s*g_(try)?(m|re)alloc(0?)(_n)?\b/) {
2828                         if ($2 == 'm') {
2829                                 ERROR("unnecessary cast may hide bugs, use g_$1new$3 instead\n" . $herecurr);
2830                         } else {
2831                                 ERROR("unnecessary cast may hide bugs, use g_$1renew$3 instead\n" . $herecurr);
2832                         }
2833                 }
2834
2835 # check for gcc specific __FUNCTION__
2836                 if ($line =~ /__FUNCTION__/) {
2837                         ERROR("__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr);
2838                 }
2839
2840 # recommend g_path_get_* over g_strdup(basename/dirname(...))
2841                 if ($line =~ /\bg_strdup\s*\(\s*(basename|dirname)\s*\(/) {
2842                         WARN("consider using g_path_get_$1() in preference to g_strdup($1())\n" . $herecurr);
2843                 }
2844
2845 # recommend qemu_strto* over strto* for numeric conversions
2846                 if ($line =~ /\b(strto[^kd].*?)\s*\(/) {
2847                         ERROR("consider using qemu_$1 in preference to $1\n" . $herecurr);
2848                 }
2849 # recommend sigaction over signal for portability, when establishing a handler
2850                 if ($line =~ /\bsignal\s*\(/ && !($line =~ /SIG_(?:IGN|DFL)/)) {
2851                         ERROR("use sigaction to establish signal handlers; signal is not portable\n" . $herecurr);
2852                 }
2853 # check for module_init(), use category-specific init macros explicitly please
2854                 if ($line =~ /^module_init\s*\(/) {
2855                         ERROR("please use block_init(), type_init() etc. instead of module_init()\n" . $herecurr);
2856                 }
2857 # check for various ops structs, ensure they are const.
2858                 my $struct_ops = qr{AIOCBInfo|
2859                                 BdrvActionOps|
2860                                 BlockDevOps|
2861                                 BlockJobDriver|
2862                                 DisplayChangeListenerOps|
2863                                 GraphicHwOps|
2864                                 IDEDMAOps|
2865                                 KVMCapabilityInfo|
2866                                 MemoryRegionIOMMUOps|
2867                                 MemoryRegionOps|
2868                                 MemoryRegionPortio|
2869                                 QEMUFileOps|
2870                                 SCSIBusInfo|
2871                                 SCSIReqOps|
2872                                 Spice[A-Z][a-zA-Z0-9]*Interface|
2873                                 USBDesc[A-Z][a-zA-Z0-9]*|
2874                                 VhostOps|
2875                                 VMStateDescription|
2876                                 VMStateInfo}x;
2877                 if ($line !~ /\bconst\b/ &&
2878                     $line =~ /\b($struct_ops)\b.*=/) {
2879                         ERROR("initializer for struct $1 should normally be const\n" .
2880                                 $herecurr);
2881                 }
2882
2883 # check for %L{u,d,i} in strings
2884                 my $string;
2885                 while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
2886                         $string = substr($rawline, $-[1], $+[1] - $-[1]);
2887                         $string =~ s/%%/__/g;
2888                         if ($string =~ /(?<!%)%L[udi]/) {
2889                                 ERROR("\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
2890                                 last;
2891                         }
2892                 }
2893
2894 # QEMU specific tests
2895                 if ($rawline =~ /\b(?:Qemu|QEmu)\b/) {
2896                         ERROR("use QEMU instead of Qemu or QEmu\n" . $herecurr);
2897                 }
2898
2899 # Qemu error function tests
2900
2901         # Find newlines in error messages
2902         my $qemu_error_funcs = qr{error_setg|
2903                                 error_setg_errno|
2904                                 error_setg_win32|
2905                                 error_setg_file_open|
2906                                 error_set|
2907                                 error_prepend|
2908                                 warn_reportf_err|
2909                                 error_reportf_err|
2910                                 error_vreport|
2911                                 warn_vreport|
2912                                 info_vreport|
2913                                 error_report|
2914                                 warn_report|
2915                                 info_report|
2916                                 g_test_message}x;
2917
2918         if ($rawline =~ /\b(?:$qemu_error_funcs)\s*\(.*\".*\\n/) {
2919                 ERROR("Error messages should not contain newlines\n" . $herecurr);
2920         }
2921
2922         # Continue checking for error messages that contains newlines. This
2923         # check handles cases where string literals are spread over multiple lines.
2924         # Example:
2925         # error_report("Error msg line #1"
2926         #              "Error msg line #2\n");
2927         my $quoted_newline_regex = qr{\+\s*\".*\\n.*\"};
2928         my $continued_str_literal = qr{\+\s*\".*\"};
2929
2930         if ($rawline =~ /$quoted_newline_regex/) {
2931                 # Backtrack to first line that does not contain only a quoted literal
2932                 # and assume that it is the start of the statement.
2933                 my $i = $linenr - 2;
2934
2935                 while (($i >= 0) & $rawlines[$i] =~ /$continued_str_literal/) {
2936                         $i--;
2937                 }
2938
2939                 if ($rawlines[$i] =~ /\b(?:$qemu_error_funcs)\s*\(/) {
2940                         ERROR("Error messages should not contain newlines\n" . $herecurr);
2941                 }
2942         }
2943
2944 # check for non-portable libc calls that have portable alternatives in QEMU
2945                 if ($line =~ /\bffs\(/) {
2946                         ERROR("use ctz32() instead of ffs()\n" . $herecurr);
2947                 }
2948                 if ($line =~ /\bffsl\(/) {
2949                         ERROR("use ctz32() or ctz64() instead of ffsl()\n" . $herecurr);
2950                 }
2951                 if ($line =~ /\bffsll\(/) {
2952                         ERROR("use ctz64() instead of ffsll()\n" . $herecurr);
2953                 }
2954                 if ($line =~ /\bbzero\(/) {
2955                         ERROR("use memset() instead of bzero()\n" . $herecurr);
2956                 }
2957                 if ($line =~ /\bgetpagesize\(\)/) {
2958                         ERROR("use qemu_real_host_page_size instead of getpagesize()\n" . $herecurr);
2959                 }
2960                 if ($line =~ /\bsysconf\(_SC_PAGESIZE\)/) {
2961                         ERROR("use qemu_real_host_page_size instead of sysconf(_SC_PAGESIZE)\n" . $herecurr);
2962                 }
2963                 my $non_exit_glib_asserts = qr{g_assert_cmpstr|
2964                                                 g_assert_cmpint|
2965                                                 g_assert_cmpuint|
2966                                                 g_assert_cmphex|
2967                                                 g_assert_cmpfloat|
2968                                                 g_assert_true|
2969                                                 g_assert_false|
2970                                                 g_assert_nonnull|
2971                                                 g_assert_null|
2972                                                 g_assert_no_error|
2973                                                 g_assert_error|
2974                                                 g_test_assert_expected_messages|
2975                                                 g_test_trap_assert_passed|
2976                                                 g_test_trap_assert_stdout|
2977                                                 g_test_trap_assert_stdout_unmatched|
2978                                                 g_test_trap_assert_stderr|
2979                                                 g_test_trap_assert_stderr_unmatched}x;
2980                 if ($realfile !~ /^tests\// &&
2981                         $line =~ /\b(?:$non_exit_glib_asserts)\(/) {
2982                         ERROR("Use g_assert or g_assert_not_reached\n". $herecurr);
2983                 }
2984         }
2985
2986         if ($is_patch && $chk_signoff && $signoff == 0) {
2987                 ERROR("Missing Signed-off-by: line(s)\n");
2988         }
2989
2990         # If we have no input at all, then there is nothing to report on
2991         # so just keep quiet.
2992         if ($#rawlines == -1) {
2993                 return 1;
2994         }
2995
2996         # In mailback mode only produce a report in the negative, for
2997         # things that appear to be patches.
2998         if ($mailback && ($clean == 1 || !$is_patch)) {
2999                 return 1;
3000         }
3001
3002         # This is not a patch, and we are are in 'no-patch' mode so
3003         # just keep quiet.
3004         if (!$chk_patch && !$is_patch) {
3005                 return 1;
3006         }
3007
3008         if (!$is_patch) {
3009                 ERROR("Does not appear to be a unified-diff format patch\n");
3010         }
3011
3012         print report_dump();
3013         if ($summary && !($clean == 1 && $quiet == 1)) {
3014                 print "$filename " if ($summary_file);
3015                 print "total: $cnt_error errors, $cnt_warn warnings, " .
3016                         "$cnt_lines lines checked\n";
3017                 print "\n" if ($quiet == 0);
3018         }
3019
3020         if ($quiet == 0) {
3021                 # If there were whitespace errors which cleanpatch can fix
3022                 # then suggest that.
3023 #               if ($rpt_cleaners) {
3024 #                       print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
3025 #                       print "      scripts/cleanfile\n\n";
3026 #               }
3027         }
3028
3029         if ($clean == 1 && $quiet == 0) {
3030                 print "$vname has no obvious style problems and is ready for submission.\n"
3031         }
3032         if ($clean == 0 && $quiet == 0) {
3033                 print "$vname has style problems, please review.  If any of these errors\n";
3034                 print "are false positives report them to the maintainer, see\n";
3035                 print "CHECKPATCH in MAINTAINERS.\n";
3036         }
3037
3038         return ($no_warnings ? $clean : $cnt_error == 0);
3039 }