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                 "vl.c"
 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 sub process {
1260         my $filename = shift;
1261
1262         my $linenr=0;
1263         my $prevline="";
1264         my $prevrawline="";
1265         my $stashline="";
1266         my $stashrawline="";
1267
1268         my $length;
1269         my $indent;
1270         my $previndent=0;
1271         my $stashindent=0;
1272
1273         our $clean = 1;
1274         my $signoff = 0;
1275         my $is_patch = 0;
1276
1277         my $in_header_lines = $file ? 0 : 1;
1278         my $in_commit_log = 0;          #Scanning lines before patch
1279         my $reported_maintainer_file = 0;
1280         my $non_utf8_charset = 0;
1281
1282         our @report = ();
1283         our $cnt_lines = 0;
1284         our $cnt_error = 0;
1285         our $cnt_warn = 0;
1286         our $cnt_chk = 0;
1287
1288         # Trace the real file/line as we go.
1289         my $realfile = '';
1290         my $realline = 0;
1291         my $realcnt = 0;
1292         my $here = '';
1293         my $in_comment = 0;
1294         my $comment_edge = 0;
1295         my $first_line = 0;
1296         my $p1_prefix = '';
1297
1298         my $prev_values = 'E';
1299
1300         # suppression flags
1301         my %suppress_ifbraces;
1302         my %suppress_whiletrailers;
1303         my %suppress_export;
1304
1305         # Pre-scan the patch sanitizing the lines.
1306
1307         sanitise_line_reset();
1308         my $line;
1309         foreach my $rawline (@rawlines) {
1310                 $linenr++;
1311                 $line = $rawline;
1312
1313                 if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1314                         $realline=$1-1;
1315                         if (defined $2) {
1316                                 $realcnt=$3+1;
1317                         } else {
1318                                 $realcnt=1+1;
1319                         }
1320                         $in_comment = 0;
1321
1322                         # Guestimate if this is a continuing comment.  Run
1323                         # the context looking for a comment "edge".  If this
1324                         # edge is a close comment then we must be in a comment
1325                         # at context start.
1326                         my $edge;
1327                         my $cnt = $realcnt;
1328                         for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1329                                 next if (defined $rawlines[$ln - 1] &&
1330                                          $rawlines[$ln - 1] =~ /^-/);
1331                                 $cnt--;
1332                                 #print "RAW<$rawlines[$ln - 1]>\n";
1333                                 last if (!defined $rawlines[$ln - 1]);
1334                                 if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1335                                     $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1336                                         ($edge) = $1;
1337                                         last;
1338                                 }
1339                         }
1340                         if (defined $edge && $edge eq '*/') {
1341                                 $in_comment = 1;
1342                         }
1343
1344                         # Guestimate if this is a continuing comment.  If this
1345                         # is the start of a diff block and this line starts
1346                         # ' *' then it is very likely a comment.
1347                         if (!defined $edge &&
1348                             $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1349                         {
1350                                 $in_comment = 1;
1351                         }
1352
1353                         ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1354                         sanitise_line_reset($in_comment);
1355
1356                 } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1357                         # Standardise the strings and chars within the input to
1358                         # simplify matching -- only bother with positive lines.
1359                         $line = sanitise_line($rawline);
1360                 }
1361                 push(@lines, $line);
1362
1363                 if ($realcnt > 1) {
1364                         $realcnt-- if ($line =~ /^(?:\+| |$)/);
1365                 } else {
1366                         $realcnt = 0;
1367                 }
1368
1369                 #print "==>$rawline\n";
1370                 #print "-->$line\n";
1371         }
1372
1373         $prefix = '';
1374
1375         $realcnt = 0;
1376         $linenr = 0;
1377         foreach my $line (@lines) {
1378                 $linenr++;
1379
1380                 my $rawline = $rawlines[$linenr - 1];
1381
1382 #extract the line range in the file after the patch is applied
1383                 if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1384                         $is_patch = 1;
1385                         $first_line = $linenr + 1;
1386                         $realline=$1-1;
1387                         if (defined $2) {
1388                                 $realcnt=$3+1;
1389                         } else {
1390                                 $realcnt=1+1;
1391                         }
1392                         annotate_reset();
1393                         $prev_values = 'E';
1394
1395                         %suppress_ifbraces = ();
1396                         %suppress_whiletrailers = ();
1397                         %suppress_export = ();
1398                         next;
1399
1400 # track the line number as we move through the hunk, note that
1401 # new versions of GNU diff omit the leading space on completely
1402 # blank context lines so we need to count that too.
1403                 } elsif ($line =~ /^( |\+|$)/) {
1404                         $realline++;
1405                         $realcnt-- if ($realcnt != 0);
1406
1407                         # Measure the line length and indent.
1408                         ($length, $indent) = line_stats($rawline);
1409
1410                         # Track the previous line.
1411                         ($prevline, $stashline) = ($stashline, $line);
1412                         ($previndent, $stashindent) = ($stashindent, $indent);
1413                         ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
1414
1415                         #warn "line<$line>\n";
1416
1417                 } elsif ($realcnt == 1) {
1418                         $realcnt--;
1419                 }
1420
1421                 my $hunk_line = ($realcnt != 0);
1422
1423 #make up the handle for any error we report on this line
1424                 $prefix = "$filename:$realline: " if ($emacs && $file);
1425                 $prefix = "$filename:$linenr: " if ($emacs && !$file);
1426
1427                 $here = "#$linenr: " if (!$file);
1428                 $here = "#$realline: " if ($file);
1429
1430                 # extract the filename as it passes
1431                 if ($line =~ /^diff --git.*?(\S+)$/) {
1432                         $realfile = $1;
1433                         $realfile =~ s@^([^/]*)/@@ if (!$file);
1434                 } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
1435                         $realfile = $1;
1436                         $realfile =~ s@^([^/]*)/@@ if (!$file);
1437
1438                         $p1_prefix = $1;
1439                         if (!$file && $tree && $p1_prefix ne '' &&
1440                             -e "$root/$p1_prefix") {
1441                                 WARN("patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
1442                         }
1443
1444                         next;
1445                 }
1446
1447                 $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
1448
1449                 my $hereline = "$here\n$rawline\n";
1450                 my $herecurr = "$here\n$rawline\n";
1451                 my $hereprev = "$here\n$prevrawline\n$rawline\n";
1452
1453                 $cnt_lines++ if ($realcnt != 0);
1454
1455 # Check for incorrect file permissions
1456                 if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
1457                         my $permhere = $here . "FILE: $realfile\n";
1458                         if ($realfile =~ /(\bMakefile(?:\.objs)?|\.c|\.cc|\.cpp|\.h|\.mak|\.[sS])$/) {
1459                                 ERROR("do not set execute permissions for source files\n" . $permhere);
1460                         }
1461                 }
1462
1463 # Accept git diff extended headers as valid patches
1464                 if ($line =~ /^(?:rename|copy) (?:from|to) [\w\/\.\-]+\s*$/) {
1465                         $is_patch = 1;
1466                 }
1467
1468                 if ($line =~ /^Author: .*via Qemu-devel.*<qemu-devel\@nongnu.org>/) {
1469                     ERROR("Author email address is mangled by the mailing list\n" . $herecurr);
1470                 }
1471
1472 #check the patch for a signoff:
1473                 if ($line =~ /^\s*signed-off-by:/i) {
1474                         # This is a signoff, if ugly, so do not double report.
1475                         $signoff++;
1476                         $in_commit_log = 0;
1477
1478                         if (!($line =~ /^\s*Signed-off-by:/)) {
1479                                 ERROR("The correct form is \"Signed-off-by\"\n" .
1480                                         $herecurr);
1481                         }
1482                         if ($line =~ /^\s*signed-off-by:\S/i) {
1483                                 ERROR("space required after Signed-off-by:\n" .
1484                                         $herecurr);
1485                         }
1486                 }
1487
1488 # Check if MAINTAINERS is being updated.  If so, there's probably no need to
1489 # emit the "does MAINTAINERS need updating?" message on file add/move/delete
1490                 if ($line =~ /^\s*MAINTAINERS\s*\|/) {
1491                         $reported_maintainer_file = 1;
1492                 }
1493
1494 # Check for added, moved or deleted files
1495                 if (!$reported_maintainer_file && !$in_commit_log &&
1496                     ($line =~ /^(?:new|deleted) file mode\s*\d+\s*$/ ||
1497                      $line =~ /^rename (?:from|to) [\w\/\.\-]+\s*$/ ||
1498                      ($line =~ /\{\s*([\w\/\.\-]*)\s*\=\>\s*([\w\/\.\-]*)\s*\}/ &&
1499                       (defined($1) || defined($2))))) {
1500                         $reported_maintainer_file = 1;
1501                         WARN("added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr);
1502                 }
1503
1504 # Check for wrappage within a valid hunk of the file
1505                 if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
1506                         ERROR("patch seems to be corrupt (line wrapped?)\n" .
1507                                 $herecurr) if (!$emitted_corrupt++);
1508                 }
1509
1510 # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
1511                 if (($realfile =~ /^$/ || $line =~ /^\+/) &&
1512                     $rawline !~ m/^$UTF8*$/) {
1513                         my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
1514
1515                         my $blank = copy_spacing($rawline);
1516                         my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
1517                         my $hereptr = "$hereline$ptr\n";
1518
1519                         ERROR("Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
1520                 }
1521
1522                 if ($rawline =~ m/$UTF8_MOJIBAKE/) {
1523                         ERROR("Doubly-encoded UTF-8\n" . $herecurr);
1524                 }
1525 # Check if it's the start of a commit log
1526 # (not a header line and we haven't seen the patch filename)
1527                 if ($in_header_lines && $realfile =~ /^$/ &&
1528                     !($rawline =~ /^\s+\S/ ||
1529                       $rawline =~ /^(commit\b|from\b|[\w-]+:).*$/i)) {
1530                         $in_header_lines = 0;
1531                         $in_commit_log = 1;
1532                 }
1533
1534 # Check if there is UTF-8 in a commit log when a mail header has explicitly
1535 # declined it, i.e defined some charset where it is missing.
1536                 if ($in_header_lines &&
1537                     $rawline =~ /^Content-Type:.+charset="(.+)".*$/ &&
1538                     $1 !~ /utf-8/i) {
1539                         $non_utf8_charset = 1;
1540                 }
1541
1542                 if ($in_commit_log && $non_utf8_charset && $realfile =~ /^$/ &&
1543                     $rawline =~ /$NON_ASCII_UTF8/) {
1544                         WARN("8-bit UTF-8 used in possible commit log\n" . $herecurr);
1545                 }
1546
1547 # ignore non-hunk lines and lines being removed
1548                 next if (!$hunk_line || $line =~ /^-/);
1549
1550 # ignore files that are being periodically imported from Linux
1551                 next if ($realfile =~ /^(linux-headers|include\/standard-headers)\//);
1552
1553 #trailing whitespace
1554                 if ($line =~ /^\+.*\015/) {
1555                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1556                         ERROR("DOS line endings\n" . $herevet);
1557
1558                 } elsif ($realfile =~ /^docs\/.+\.txt/ ||
1559                          $realfile =~ /^docs\/.+\.md/) {
1560                     if ($rawline =~ /^\+\s+$/ && $rawline !~ /^\+ {4}$/) {
1561                         # TODO: properly check we're in a code block
1562                         #       (surrounding text is 4-column aligned)
1563                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1564                         ERROR("code blocks in documentation should have " .
1565                               "empty lines with exactly 4 columns of " .
1566                               "whitespace\n" . $herevet);
1567                     }
1568                 } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
1569                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1570                         ERROR("trailing whitespace\n" . $herevet);
1571                         $rpt_cleaners = 1;
1572                 }
1573
1574 # checks for trace-events files
1575                 if ($realfile =~ /trace-events$/ && $line =~ /^\+/) {
1576                         if ($rawline =~ /%[-+ 0]*#/) {
1577                                 ERROR("Don't use '#' flag of printf format ('%#') in " .
1578                                       "trace-events, use '0x' prefix instead\n" . $herecurr);
1579                         } else {
1580                                 my $hex =
1581                                         qr/%[-+ *.0-9]*([hljztL]|ll|hh)?(x|X|"\s*PRI[xX][^"]*"?)/;
1582
1583                                 # don't consider groups splitted by [.:/ ], like 2A.20:12ab
1584                                 my $tmpline = $rawline;
1585                                 $tmpline =~ s/($hex[.:\/ ])+$hex//g;
1586
1587                                 if ($tmpline =~ /(?<!0x)$hex/) {
1588                                         ERROR("Hex numbers must be prefixed with '0x'\n" .
1589                                               $herecurr);
1590                                 }
1591                         }
1592                 }
1593
1594 # check we are in a valid source file if not then ignore this hunk
1595                 next if ($realfile !~ /$SrcFile/);
1596
1597 #90 column limit; exempt URLs, if no other words on line
1598                 if ($line =~ /^\+/ &&
1599                     !($line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
1600                     !($rawline =~ /^[^[:alnum:]]*https?:\S*$/) &&
1601                     $length > 80)
1602                 {
1603                         if ($length > 90) {
1604                                 ERROR("line over 90 characters\n" . $herecurr);
1605                         } else {
1606                                 WARN("line over 80 characters\n" . $herecurr);
1607                         }
1608                 }
1609
1610 # check for spaces before a quoted newline
1611                 if ($rawline =~ /^.*\".*\s\\n/) {
1612                         ERROR("unnecessary whitespace before a quoted newline\n" . $herecurr);
1613                 }
1614
1615 # check for adding lines without a newline.
1616                 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
1617                         ERROR("adding a line without newline at end of file\n" . $herecurr);
1618                 }
1619
1620 # check for RCS/CVS revision markers
1621                 if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|\b)/) {
1622                         ERROR("CVS style keyword markers, these will _not_ be updated\n". $herecurr);
1623                 }
1624
1625 # tabs are only allowed in assembly source code, and in
1626 # some scripts we imported from other projects.
1627                 next if ($realfile =~ /\.(s|S)$/);
1628                 next if ($realfile =~ /(checkpatch|get_maintainer|texi2pod)\.pl$/);
1629
1630                 if ($rawline =~ /^\+.*\t/) {
1631                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1632                         ERROR("code indent should never use tabs\n" . $herevet);
1633                         $rpt_cleaners = 1;
1634                 }
1635
1636 # check we are in a valid C source file if not then ignore this hunk
1637                 next if ($realfile !~ /\.(h|c|cpp)$/);
1638
1639 # Block comment styles
1640
1641                 # Block comments use /* on a line of its own
1642                 if ($rawline !~ m@^\+.*/\*.*\*/[ \t)}]*$@ &&    #inline /*...*/
1643                     $rawline =~ m@^\+.*/\*\*?+[ \t]*[^ \t]@) { # /* or /** non-blank
1644                         WARN("Block comments use a leading /* on a separate line\n" . $herecurr);
1645                 }
1646
1647 # Block comments use * on subsequent lines
1648                 if ($prevline =~ /$;[ \t]*$/ &&                 #ends in comment
1649                     $prevrawline =~ /^\+.*?\/\*/ &&             #starting /*
1650                     $prevrawline !~ /\*\/[ \t]*$/ &&            #no trailing */
1651                     $rawline =~ /^\+/ &&                        #line is new
1652                     $rawline !~ /^\+[ \t]*\*/) {                #no leading *
1653                         WARN("Block comments use * on subsequent lines\n" . $hereprev);
1654                 }
1655
1656 # Block comments use */ on trailing lines
1657                 if ($rawline !~ m@^\+[ \t]*\*/[ \t]*$@ &&       #trailing */
1658                     $rawline !~ m@^\+.*/\*.*\*/[ \t]*$@ &&      #inline /*...*/
1659                     $rawline !~ m@^\+.*\*{2,}/[ \t]*$@ &&       #trailing **/
1660                     $rawline =~ m@^\+[ \t]*.+\*\/[ \t]*$@) {    #non blank */
1661                         WARN("Block comments use a trailing */ on a separate line\n" . $herecurr);
1662                 }
1663
1664 # Block comment * alignment
1665                 if ($prevline =~ /$;[ \t]*$/ &&                 #ends in comment
1666                     $line =~ /^\+[ \t]*$;/ &&                   #leading comment
1667                     $rawline =~ /^\+[ \t]*\*/ &&                #leading *
1668                     (($prevrawline =~ /^\+.*?\/\*/ &&           #leading /*
1669                       $prevrawline !~ /\*\/[ \t]*$/) ||         #no trailing */
1670                      $prevrawline =~ /^\+[ \t]*\*/)) {          #leading *
1671                         my $oldindent;
1672                         $prevrawline =~ m@^\+([ \t]*/?)\*@;
1673                         if (defined($1)) {
1674                                 $oldindent = expand_tabs($1);
1675                         } else {
1676                                 $prevrawline =~ m@^\+(.*/?)\*@;
1677                                 $oldindent = expand_tabs($1);
1678                         }
1679                         $rawline =~ m@^\+([ \t]*)\*@;
1680                         my $newindent = $1;
1681                         $newindent = expand_tabs($newindent);
1682                         if (length($oldindent) ne length($newindent)) {
1683                                 WARN("Block comments should align the * on each line\n" . $hereprev);
1684                         }
1685                 }
1686
1687 # Check for potential 'bare' types
1688                 my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
1689                     $realline_next);
1690                 if ($realcnt && $line =~ /.\s*\S/) {
1691                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1692                                 ctx_statement_block($linenr, $realcnt, 0);
1693                         $stat =~ s/\n./\n /g;
1694                         $cond =~ s/\n./\n /g;
1695
1696                         # Find the real next line.
1697                         $realline_next = $line_nr_next;
1698                         if (defined $realline_next &&
1699                             (!defined $lines[$realline_next - 1] ||
1700                              substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
1701                                 $realline_next++;
1702                         }
1703
1704                         my $s = $stat;
1705                         $s =~ s/{.*$//s;
1706
1707                         # Ignore goto labels.
1708                         if ($s =~ /$Ident:\*$/s) {
1709
1710                         # Ignore functions being called
1711                         } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
1712
1713                         } elsif ($s =~ /^.\s*else\b/s) {
1714
1715                         # declarations always start with types
1716                         } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
1717                                 my $type = $1;
1718                                 $type =~ s/\s+/ /g;
1719                                 possible($type, "A:" . $s);
1720
1721                         # definitions in global scope can only start with types
1722                         } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
1723                                 possible($1, "B:" . $s);
1724                         }
1725
1726                         # any (foo ... *) is a pointer cast, and foo is a type
1727                         while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
1728                                 possible($1, "C:" . $s);
1729                         }
1730
1731                         # Check for any sort of function declaration.
1732                         # int foo(something bar, other baz);
1733                         # void (*store_gdt)(x86_descr_ptr *);
1734                         if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
1735                                 my ($name_len) = length($1);
1736
1737                                 my $ctx = $s;
1738                                 substr($ctx, 0, $name_len + 1, '');
1739                                 $ctx =~ s/\)[^\)]*$//;
1740
1741                                 for my $arg (split(/\s*,\s*/, $ctx)) {
1742                                         if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
1743
1744                                                 possible($1, "D:" . $s);
1745                                         }
1746                                 }
1747                         }
1748
1749                 }
1750
1751 #
1752 # Checks which may be anchored in the context.
1753 #
1754
1755 # Check for switch () and associated case and default
1756 # statements should be at the same indent.
1757                 if ($line=~/\bswitch\s*\(.*\)/) {
1758                         my $err = '';
1759                         my $sep = '';
1760                         my @ctx = ctx_block_outer($linenr, $realcnt);
1761                         shift(@ctx);
1762                         for my $ctx (@ctx) {
1763                                 my ($clen, $cindent) = line_stats($ctx);
1764                                 if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
1765                                                         $indent != $cindent) {
1766                                         $err .= "$sep$ctx\n";
1767                                         $sep = '';
1768                                 } else {
1769                                         $sep = "[...]\n";
1770                                 }
1771                         }
1772                         if ($err ne '') {
1773                                 ERROR("switch and case should be at the same indent\n$hereline$err");
1774                         }
1775                 }
1776
1777 # if/while/etc brace do not go on next line, unless defining a do while loop,
1778 # or if that brace on the next line is for something else
1779                 if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
1780                         my $pre_ctx = "$1$2";
1781
1782                         my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
1783                         my $ctx_cnt = $realcnt - $#ctx - 1;
1784                         my $ctx = join("\n", @ctx);
1785
1786                         my $ctx_ln = $linenr;
1787                         my $ctx_skip = $realcnt;
1788
1789                         while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
1790                                         defined $lines[$ctx_ln - 1] &&
1791                                         $lines[$ctx_ln - 1] =~ /^-/)) {
1792                                 ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
1793                                 $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
1794                                 $ctx_ln++;
1795                         }
1796
1797                         #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
1798                         #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
1799
1800                         # The length of the "previous line" is checked against 80 because it
1801                         # includes the + at the beginning of the line (if the actual line has
1802                         # 79 or 80 characters, it is no longer possible to add a space and an
1803                         # opening brace there)
1804                         if ($#ctx == 0 && $ctx !~ /{\s*/ &&
1805                             defined($lines[$ctx_ln - 1]) && $lines[$ctx_ln - 1] =~ /^\+\s*\{/ &&
1806                             defined($lines[$ctx_ln - 2]) && length($lines[$ctx_ln - 2]) < 80) {
1807                                 ERROR("that open brace { should be on the previous line\n" .
1808                                         "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1809                         }
1810                         if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
1811                             $ctx =~ /\)\s*\;\s*$/ &&
1812                             defined $lines[$ctx_ln - 1])
1813                         {
1814                                 my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
1815                                 if ($nindent > $indent) {
1816                                         ERROR("trailing semicolon indicates no statements, indent implies otherwise\n" .
1817                                                 "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1818                                 }
1819                         }
1820                 }
1821
1822 # 'do ... while (0/false)' only makes sense in macros, without trailing ';'
1823                 if ($line =~ /while\s*\((0|false)\);/) {
1824                         ERROR("suspicious ; after while (0)\n" . $herecurr);
1825                 }
1826
1827 # Check relative indent for conditionals and blocks.
1828                 if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
1829                         my ($s, $c) = ($stat, $cond);
1830
1831                         substr($s, 0, length($c), '');
1832
1833                         # Make sure we remove the line prefixes as we have
1834                         # none on the first line, and are going to readd them
1835                         # where necessary.
1836                         $s =~ s/\n./\n/gs;
1837
1838                         # Find out how long the conditional actually is.
1839                         my @newlines = ($c =~ /\n/gs);
1840                         my $cond_lines = 1 + $#newlines;
1841
1842                         # We want to check the first line inside the block
1843                         # starting at the end of the conditional, so remove:
1844                         #  1) any blank line termination
1845                         #  2) any opening brace { on end of the line
1846                         #  3) any do (...) {
1847                         my $continuation = 0;
1848                         my $check = 0;
1849                         $s =~ s/^.*\bdo\b//;
1850                         $s =~ s/^\s*\{//;
1851                         if ($s =~ s/^\s*\\//) {
1852                                 $continuation = 1;
1853                         }
1854                         if ($s =~ s/^\s*?\n//) {
1855                                 $check = 1;
1856                                 $cond_lines++;
1857                         }
1858
1859                         # Also ignore a loop construct at the end of a
1860                         # preprocessor statement.
1861                         if (($prevline =~ /^.\s*#\s*define\s/ ||
1862                             $prevline =~ /\\\s*$/) && $continuation == 0) {
1863                                 $check = 0;
1864                         }
1865
1866                         my $cond_ptr = -1;
1867                         $continuation = 0;
1868                         while ($cond_ptr != $cond_lines) {
1869                                 $cond_ptr = $cond_lines;
1870
1871                                 # If we see an #else/#elif then the code
1872                                 # is not linear.
1873                                 if ($s =~ /^\s*\#\s*(?:else|elif)/) {
1874                                         $check = 0;
1875                                 }
1876
1877                                 # Ignore:
1878                                 #  1) blank lines, they should be at 0,
1879                                 #  2) preprocessor lines, and
1880                                 #  3) labels.
1881                                 if ($continuation ||
1882                                     $s =~ /^\s*?\n/ ||
1883                                     $s =~ /^\s*#\s*?/ ||
1884                                     $s =~ /^\s*$Ident\s*:/) {
1885                                         $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
1886                                         if ($s =~ s/^.*?\n//) {
1887                                                 $cond_lines++;
1888                                         }
1889                                 }
1890                         }
1891
1892                         my (undef, $sindent) = line_stats("+" . $s);
1893                         my $stat_real = raw_line($linenr, $cond_lines);
1894
1895                         # Check if either of these lines are modified, else
1896                         # this is not this patch's fault.
1897                         if (!defined($stat_real) ||
1898                             $stat !~ /^\+/ && $stat_real !~ /^\+/) {
1899                                 $check = 0;
1900                         }
1901                         if (defined($stat_real) && $cond_lines > 1) {
1902                                 $stat_real = "[...]\n$stat_real";
1903                         }
1904
1905                         #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";
1906
1907                         if ($check && (($sindent % 4) != 0 ||
1908                             ($sindent <= $indent && $s ne ''))) {
1909                                 ERROR("suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
1910                         }
1911                 }
1912
1913                 # Track the 'values' across context and added lines.
1914                 my $opline = $line; $opline =~ s/^./ /;
1915                 my ($curr_values, $curr_vars) =
1916                                 annotate_values($opline . "\n", $prev_values);
1917                 $curr_values = $prev_values . $curr_values;
1918                 if ($dbg_values) {
1919                         my $outline = $opline; $outline =~ s/\t/ /g;
1920                         print "$linenr > .$outline\n";
1921                         print "$linenr > $curr_values\n";
1922                         print "$linenr >  $curr_vars\n";
1923                 }
1924                 $prev_values = substr($curr_values, -1);
1925
1926 #ignore lines not being added
1927                 if ($line=~/^[^\+]/) {next;}
1928
1929 # TEST: allow direct testing of the type matcher.
1930                 if ($dbg_type) {
1931                         if ($line =~ /^.\s*$Declare\s*$/) {
1932                                 ERROR("TEST: is type\n" . $herecurr);
1933                         } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
1934                                 ERROR("TEST: is not type ($1 is)\n". $herecurr);
1935                         }
1936                         next;
1937                 }
1938 # TEST: allow direct testing of the attribute matcher.
1939                 if ($dbg_attr) {
1940                         if ($line =~ /^.\s*$Modifier\s*$/) {
1941                                 ERROR("TEST: is attr\n" . $herecurr);
1942                         } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
1943                                 ERROR("TEST: is not attr ($1 is)\n". $herecurr);
1944                         }
1945                         next;
1946                 }
1947
1948 # check for initialisation to aggregates open brace on the next line
1949                 if ($line =~ /^.\s*\{/ &&
1950                     $prevline =~ /(?:^|[^=])=\s*$/) {
1951                         ERROR("that open brace { should be on the previous line\n" . $hereprev);
1952                 }
1953
1954 #
1955 # Checks which are anchored on the added line.
1956 #
1957
1958 # check for malformed paths in #include statements (uses RAW line)
1959                 if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
1960                         my $path = $1;
1961                         if ($path =~ m{//}) {
1962                                 ERROR("malformed #include filename\n" .
1963                                         $herecurr);
1964                         }
1965                 }
1966
1967 # no C99 // comments
1968                 if ($line =~ m{//} &&
1969                     $rawline !~ m{// SPDX-License-Identifier: }) {
1970                         ERROR("do not use C99 // comments\n" . $herecurr);
1971                 }
1972                 # Remove C99 comments.
1973                 $line =~ s@//.*@@;
1974                 $opline =~ s@//.*@@;
1975
1976 # check for global initialisers.
1977                 if ($line =~ /^.$Type\s*$Ident\s*(?:\s+$Modifier)*\s*=\s*(0|NULL|false)\s*;/) {
1978                         ERROR("do not initialise globals to 0 or NULL\n" .
1979                                 $herecurr);
1980                 }
1981 # check for static initialisers.
1982                 if ($line =~ /\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
1983                         ERROR("do not initialise statics to 0 or NULL\n" .
1984                                 $herecurr);
1985                 }
1986
1987 # * goes on variable not on type
1988                 # (char*[ const])
1989                 if ($line =~ m{\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\)}) {
1990                         my ($from, $to) = ($1, $1);
1991
1992                         # Should start with a space.
1993                         $to =~ s/^(\S)/ $1/;
1994                         # Should not end with a space.
1995                         $to =~ s/\s+$//;
1996                         # '*'s should not have spaces between.
1997                         while ($to =~ s/\*\s+\*/\*\*/) {
1998                         }
1999
2000                         #print "from<$from> to<$to>\n";
2001                         if ($from ne $to) {
2002                                 ERROR("\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr);
2003                         }
2004                 } elsif ($line =~ m{\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident)}) {
2005                         my ($from, $to, $ident) = ($1, $1, $2);
2006
2007                         # Should start with a space.
2008                         $to =~ s/^(\S)/ $1/;
2009                         # Should not end with a space.
2010                         $to =~ s/\s+$//;
2011                         # '*'s should not have spaces between.
2012                         while ($to =~ s/\*\s+\*/\*\*/) {
2013                         }
2014                         # Modifiers should have spaces.
2015                         $to =~ s/(\b$Modifier$)/$1 /;
2016
2017                         #print "from<$from> to<$to> ident<$ident>\n";
2018                         if ($from ne $to && $ident !~ /^$Modifier$/) {
2019                                 ERROR("\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr);
2020                         }
2021                 }
2022
2023 # function brace can't be on same line, except for #defines of do while,
2024 # or if closed on same line
2025                 if (($line=~/$Type\s*$Ident\(.*\).*\s\{/) and
2026                     !($line=~/\#\s*define.*do\s\{/) and !($line=~/}/)) {
2027                         ERROR("open brace '{' following function declarations go on the next line\n" . $herecurr);
2028                 }
2029
2030 # open braces for enum, union and struct go on the same line.
2031                 if ($line =~ /^.\s*\{/ &&
2032                     $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
2033                         ERROR("open brace '{' following $1 go on the same line\n" . $hereprev);
2034                 }
2035
2036 # missing space after union, struct or enum definition
2037                 if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?(?:\s+$Ident)?[=\{]/) {
2038                     ERROR("missing space after $1 definition\n" . $herecurr);
2039                 }
2040
2041 # check for spacing round square brackets; allowed:
2042 #  1. with a type on the left -- int [] a;
2043 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
2044 #  3. inside a curly brace -- = { [0...10] = 5 }
2045 #  4. after a comma -- [1] = 5, [2] = 6
2046 #  5. in a macro definition -- #define abc(x) [x] = y
2047                 while ($line =~ /(.*?\s)\[/g) {
2048                         my ($where, $prefix) = ($-[1], $1);
2049                         if ($prefix !~ /$Type\s+$/ &&
2050                             ($where != 0 || $prefix !~ /^.\s+$/) &&
2051                             $prefix !~ /\#\s*define[^(]*\([^)]*\)\s+$/ &&
2052                             $prefix !~ /[,{:]\s+$/) {
2053                                 ERROR("space prohibited before open square bracket '['\n" . $herecurr);
2054                         }
2055                 }
2056
2057 # check for spaces between functions and their parentheses.
2058                 while ($line =~ /($Ident)\s+\(/g) {
2059                         my $name = $1;
2060                         my $ctx_before = substr($line, 0, $-[1]);
2061                         my $ctx = "$ctx_before$name";
2062
2063                         # Ignore those directives where spaces _are_ permitted.
2064                         if ($name =~ /^(?:
2065                                 if|for|while|switch|return|case|
2066                                 volatile|__volatile__|coroutine_fn|
2067                                 __attribute__|format|__extension__|
2068                                 asm|__asm__)$/x)
2069                         {
2070
2071                         # Ignore 'catch (...)' in C++
2072                         } elsif ($name =~ /^catch$/ && $realfile =~ /(\.cpp|\.h)$/) {
2073
2074                         # cpp #define statements have non-optional spaces, ie
2075                         # if there is a space between the name and the open
2076                         # parenthesis it is simply not a parameter group.
2077                         } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
2078
2079                         # cpp #elif statement condition may start with a (
2080                         } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
2081
2082                         # If this whole things ends with a type its most
2083                         # likely a typedef for a function.
2084                         } elsif ($ctx =~ /$Type$/) {
2085
2086                         } else {
2087                                 ERROR("space prohibited between function name and open parenthesis '('\n" . $herecurr);
2088                         }
2089                 }
2090 # Check operator spacing.
2091                 if (!($line=~/\#\s*include/)) {
2092                         my $ops = qr{
2093                                 <<=|>>=|<=|>=|==|!=|
2094                                 \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
2095                                 =>|->|<<|>>|<|>|=|!|~|
2096                                 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
2097                                 \?|::|:
2098                         }x;
2099                         my @elements = split(/($ops|;)/, $opline);
2100                         my $off = 0;
2101
2102                         my $blank = copy_spacing($opline);
2103
2104                         for (my $n = 0; $n < $#elements; $n += 2) {
2105                                 $off += length($elements[$n]);
2106
2107                                 # Pick up the preceding and succeeding characters.
2108                                 my $ca = substr($opline, 0, $off);
2109                                 my $cc = '';
2110                                 if (length($opline) >= ($off + length($elements[$n + 1]))) {
2111                                         $cc = substr($opline, $off + length($elements[$n + 1]));
2112                                 }
2113                                 my $cb = "$ca$;$cc";
2114
2115                                 my $a = '';
2116                                 $a = 'V' if ($elements[$n] ne '');
2117                                 $a = 'W' if ($elements[$n] =~ /\s$/);
2118                                 $a = 'C' if ($elements[$n] =~ /$;$/);
2119                                 $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
2120                                 $a = 'O' if ($elements[$n] eq '');
2121                                 $a = 'E' if ($ca =~ /^\s*$/);
2122
2123                                 my $op = $elements[$n + 1];
2124
2125                                 my $c = '';
2126                                 if (defined $elements[$n + 2]) {
2127                                         $c = 'V' if ($elements[$n + 2] ne '');
2128                                         $c = 'W' if ($elements[$n + 2] =~ /^\s/);
2129                                         $c = 'C' if ($elements[$n + 2] =~ /^$;/);
2130                                         $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
2131                                         $c = 'O' if ($elements[$n + 2] eq '');
2132                                         $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
2133                                 } else {
2134                                         $c = 'E';
2135                                 }
2136
2137                                 my $ctx = "${a}x${c}";
2138
2139                                 my $at = "(ctx:$ctx)";
2140
2141                                 my $ptr = substr($blank, 0, $off) . "^";
2142                                 my $hereptr = "$hereline$ptr\n";
2143
2144                                 # Pull out the value of this operator.
2145                                 my $op_type = substr($curr_values, $off + 1, 1);
2146
2147                                 # Get the full operator variant.
2148                                 my $opv = $op . substr($curr_vars, $off, 1);
2149
2150                                 # Ignore operators passed as parameters.
2151                                 if ($op_type ne 'V' &&
2152                                     $ca =~ /\s$/ && $cc =~ /^\s*,/) {
2153
2154 #                               # Ignore comments
2155 #                               } elsif ($op =~ /^$;+$/) {
2156
2157                                 # ; should have either the end of line or a space or \ after it
2158                                 } elsif ($op eq ';') {
2159                                         if ($ctx !~ /.x[WEBC]/ &&
2160                                             $cc !~ /^\\/ && $cc !~ /^;/) {
2161                                                 ERROR("space required after that '$op' $at\n" . $hereptr);
2162                                         }
2163
2164                                 # // is a comment
2165                                 } elsif ($op eq '//') {
2166
2167                                 # Ignore : used in class declaration in C++
2168                                 } elsif ($opv eq ':B' && $ctx =~ /Wx[WE]/ &&
2169                                                  $line =~ /class/ && $realfile =~ /(\.cpp|\.h)$/) {
2170
2171                                 # No spaces for:
2172                                 #   ->
2173                                 #   :   when part of a bitfield
2174                                 } elsif ($op eq '->' || $opv eq ':B') {
2175                                         if ($ctx =~ /Wx.|.xW/) {
2176                                                 ERROR("spaces prohibited around that '$op' $at\n" . $hereptr);
2177                                         }
2178
2179                                 # , must have a space on the right.
2180                                 # not required when having a single },{ on one line
2181                                 } elsif ($op eq ',') {
2182                                         if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/ &&
2183                                             ($elements[$n] . $elements[$n + 2]) !~ " *}\\{") {
2184                                                 ERROR("space required after that '$op' $at\n" . $hereptr);
2185                                         }
2186
2187                                 # '*' as part of a type definition -- reported already.
2188                                 } elsif ($opv eq '*_') {
2189                                         #warn "'*' is part of type\n";
2190
2191                                 # unary operators should have a space before and
2192                                 # none after.  May be left adjacent to another
2193                                 # unary operator, or a cast
2194                                 } elsif ($op eq '!' || $op eq '~' ||
2195                                          $opv eq '*U' || $opv eq '-U' ||
2196                                          $opv eq '&U' || $opv eq '&&U') {
2197                                         if ($op eq '~' && $ca =~ /::$/ && $realfile =~ /(\.cpp|\.h)$/) {
2198                                                 # '~' used as a name of Destructor
2199
2200                                         } elsif ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
2201                                                 ERROR("space required before that '$op' $at\n" . $hereptr);
2202                                         }
2203                                         if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
2204                                                 # A unary '*' may be const
2205
2206                                         } elsif ($ctx =~ /.xW/) {
2207                                                 ERROR("space prohibited after that '$op' $at\n" . $hereptr);
2208                                         }
2209
2210                                 # unary ++ and unary -- are allowed no space on one side.
2211                                 } elsif ($op eq '++' or $op eq '--') {
2212                                         if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
2213                                                 ERROR("space required one side of that '$op' $at\n" . $hereptr);
2214                                         }
2215                                         if ($ctx =~ /Wx[BE]/ ||
2216                                             ($ctx =~ /Wx./ && $cc =~ /^;/)) {
2217                                                 ERROR("space prohibited before that '$op' $at\n" . $hereptr);
2218                                         }
2219                                         if ($ctx =~ /ExW/) {
2220                                                 ERROR("space prohibited after that '$op' $at\n" . $hereptr);
2221                                         }
2222
2223                                 # A colon needs no spaces before when it is
2224                                 # terminating a case value or a label.
2225                                 } elsif ($opv eq ':C' || $opv eq ':L') {
2226                                         if ($ctx =~ /Wx./) {
2227                                                 ERROR("space prohibited before that '$op' $at\n" . $hereptr);
2228                                         }
2229
2230                                 # All the others need spaces both sides.
2231                                 } elsif ($ctx !~ /[EWC]x[CWE]/) {
2232                                         my $ok = 0;
2233
2234                                         if ($realfile =~ /\.cpp|\.h$/) {
2235                                                 # Ignore template arguments <...> in C++
2236                                                 if (($op eq '<' || $op eq '>') && $line =~ /<.*>/) {
2237                                                         $ok = 1;
2238                                                 }
2239
2240                                                 # Ignore :: in C++
2241                                                 if ($op eq '::') {
2242                                                         $ok = 1;
2243                                                 }
2244                                         }
2245
2246                                         # Ignore email addresses <foo@bar>
2247                                         if (($op eq '<' &&
2248                                              $cc =~ /^\S+\@\S+>/) ||
2249                                             ($op eq '>' &&
2250                                              $ca =~ /<\S+\@\S+$/))
2251                                         {
2252                                                 $ok = 1;
2253                                         }
2254
2255                                         # Ignore ?:
2256                                         if (($opv eq ':O' && $ca =~ /\?$/) ||
2257                                             ($op eq '?' && $cc =~ /^:/)) {
2258                                                 $ok = 1;
2259                                         }
2260
2261                                         if ($ok == 0) {
2262                                                 ERROR("spaces required around that '$op' $at\n" . $hereptr);
2263                                         }
2264                                 }
2265                                 $off += length($elements[$n + 1]);
2266                         }
2267                 }
2268
2269 #need space before brace following if, while, etc
2270                 if (($line =~ /\(.*\)\{/ && $line !~ /\($Type\)\{/) ||
2271                     $line =~ /do\{/) {
2272                         ERROR("space required before the open brace '{'\n" . $herecurr);
2273                 }
2274
2275 # closing brace should have a space following it when it has anything
2276 # on the line
2277                 if ($line =~ /}(?!(?:,|;|\)))\S/) {
2278                         ERROR("space required after that close brace '}'\n" . $herecurr);
2279                 }
2280
2281 # check spacing on square brackets
2282                 if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
2283                         ERROR("space prohibited after that open square bracket '['\n" . $herecurr);
2284                 }
2285                 if ($line =~ /\s\]/) {
2286                         ERROR("space prohibited before that close square bracket ']'\n" . $herecurr);
2287                 }
2288
2289 # check spacing on parentheses
2290                 if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
2291                     $line !~ /for\s*\(\s+;/) {
2292                         ERROR("space prohibited after that open parenthesis '('\n" . $herecurr);
2293                 }
2294                 if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
2295                     $line !~ /for\s*\(.*;\s+\)/ &&
2296                     $line !~ /:\s+\)/) {
2297                         ERROR("space prohibited before that close parenthesis ')'\n" . $herecurr);
2298                 }
2299
2300 # Return is not a function.
2301                 if (defined($stat) && $stat =~ /^.\s*return(\s*)(\(.*);/s) {
2302                         my $spacing = $1;
2303                         my $value = $2;
2304
2305                         # Flatten any parentheses
2306                         $value =~ s/\(/ \(/g;
2307                         $value =~ s/\)/\) /g;
2308                         while ($value =~ s/\[[^\{\}]*\]/1/ ||
2309                                $value !~ /(?:$Ident|-?$Constant)\s*
2310                                              $Compare\s*
2311                                              (?:$Ident|-?$Constant)/x &&
2312                                $value =~ s/\([^\(\)]*\)/1/) {
2313                         }
2314 #print "value<$value>\n";
2315                         if ($value =~ /^\s*(?:$Ident|-?$Constant)\s*$/ &&
2316                             $line =~ /;$/) {
2317                                 ERROR("return is not a function, parentheses are not required\n" . $herecurr);
2318
2319                         } elsif ($spacing !~ /\s+/) {
2320                                 ERROR("space required before the open parenthesis '('\n" . $herecurr);
2321                         }
2322                 }
2323 # Return of what appears to be an errno should normally be -'ve
2324                 if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
2325                         my $name = $1;
2326                         if ($name ne 'EOF' && $name ne 'ERROR') {
2327                                 ERROR("return of an errno should typically be -ve (return -$1)\n" . $herecurr);
2328                         }
2329                 }
2330
2331                 if ($line =~ /^.\s*(Q(?:S?LIST|SIMPLEQ|TAILQ)_HEAD)\s*\(\s*[^,]/ &&
2332                     $line !~ /^.typedef/) {
2333                     ERROR("named $1 should be typedefed separately\n" . $herecurr);
2334                 }
2335
2336 # Need a space before open parenthesis after if, while etc
2337                 if ($line=~/\b(if|while|for|switch)\(/) {
2338                         ERROR("space required before the open parenthesis '('\n" . $herecurr);
2339                 }
2340
2341 # Check for illegal assignment in if conditional -- and check for trailing
2342 # statements after the conditional.
2343                 if ($line =~ /do\s*(?!{)/) {
2344                         my ($stat_next) = ctx_statement_block($line_nr_next,
2345                                                 $remain_next, $off_next);
2346                         $stat_next =~ s/\n./\n /g;
2347                         ##print "stat<$stat> stat_next<$stat_next>\n";
2348
2349                         if ($stat_next =~ /^\s*while\b/) {
2350                                 # If the statement carries leading newlines,
2351                                 # then count those as offsets.
2352                                 my ($whitespace) =
2353                                         ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
2354                                 my $offset =
2355                                         statement_rawlines($whitespace) - 1;
2356
2357                                 $suppress_whiletrailers{$line_nr_next +
2358                                                                 $offset} = 1;
2359                         }
2360                 }
2361                 if (!defined $suppress_whiletrailers{$linenr} &&
2362                     $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
2363                         my ($s, $c) = ($stat, $cond);
2364
2365                         if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
2366                                 ERROR("do not use assignment in if condition\n" . $herecurr);
2367                         }
2368
2369                         # Find out what is on the end of the line after the
2370                         # conditional.
2371                         substr($s, 0, length($c), '');
2372                         $s =~ s/\n.*//g;
2373                         $s =~ s/$;//g;  # Remove any comments
2374                         if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
2375                             $c !~ /}\s*while\s*/)
2376                         {
2377                                 # Find out how long the conditional actually is.
2378                                 my @newlines = ($c =~ /\n/gs);
2379                                 my $cond_lines = 1 + $#newlines;
2380                                 my $stat_real = '';
2381
2382                                 $stat_real = raw_line($linenr, $cond_lines)
2383                                                         . "\n" if ($cond_lines);
2384                                 if (defined($stat_real) && $cond_lines > 1) {
2385                                         $stat_real = "[...]\n$stat_real";
2386                                 }
2387
2388                                 ERROR("trailing statements should be on next line\n" . $herecurr . $stat_real);
2389                         }
2390                 }
2391
2392 # Check for bitwise tests written as boolean
2393                 if ($line =~ /
2394                         (?:
2395                                 (?:\[|\(|\&\&|\|\|)
2396                                 \s*0[xX][0-9]+\s*
2397                                 (?:\&\&|\|\|)
2398                         |
2399                                 (?:\&\&|\|\|)
2400                                 \s*0[xX][0-9]+\s*
2401                                 (?:\&\&|\|\||\)|\])
2402                         )/x)
2403                 {
2404                         ERROR("boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
2405                 }
2406
2407 # if and else should not have general statements after it
2408                 if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
2409                         my $s = $1;
2410                         $s =~ s/$;//g;  # Remove any comments
2411                         if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
2412                                 ERROR("trailing statements should be on next line\n" . $herecurr);
2413                         }
2414                 }
2415 # if should not continue a brace
2416                 if ($line =~ /}\s*if\b/) {
2417                         ERROR("trailing statements should be on next line\n" .
2418                                 $herecurr);
2419                 }
2420 # case and default should not have general statements after them
2421                 if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
2422                     $line !~ /\G(?:
2423                         (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
2424                         \s*return\s+
2425                     )/xg)
2426                 {
2427                         ERROR("trailing statements should be on next line\n" . $herecurr);
2428                 }
2429
2430                 # Check for }<nl>else {, these must be at the same
2431                 # indent level to be relevant to each other.
2432                 if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
2433                                                 $previndent == $indent) {
2434                         ERROR("else should follow close brace '}'\n" . $hereprev);
2435                 }
2436
2437                 if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and
2438                                                 $previndent == $indent) {
2439                         my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
2440
2441                         # Find out what is on the end of the line after the
2442                         # conditional.
2443                         substr($s, 0, length($c), '');
2444                         $s =~ s/\n.*//g;
2445
2446                         if ($s =~ /^\s*;/) {
2447                                 ERROR("while should follow close brace '}'\n" . $hereprev);
2448                         }
2449                 }
2450
2451 #studly caps, commented out until figure out how to distinguish between use of existing and adding new
2452 #               if (($line=~/[\w_][a-z\d]+[A-Z]/) and !($line=~/print/)) {
2453 #                   print "No studly caps, use _\n";
2454 #                   print "$herecurr";
2455 #                   $clean = 0;
2456 #               }
2457
2458 #no spaces allowed after \ in define
2459                 if ($line=~/\#\s*define.*\\\s$/) {
2460                         ERROR("Whitespace after \\ makes next lines useless\n" . $herecurr);
2461                 }
2462
2463 # multi-statement macros should be enclosed in a do while loop, grab the
2464 # first statement and ensure its the whole macro if its not enclosed
2465 # in a known good container
2466                 if ($realfile !~ m@/vmlinux.lds.h$@ &&
2467                     $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
2468                         my $ln = $linenr;
2469                         my $cnt = $realcnt;
2470                         my ($off, $dstat, $dcond, $rest);
2471                         my $ctx = '';
2472
2473                         my $args = defined($1);
2474
2475                         # Find the end of the macro and limit our statement
2476                         # search to that.
2477                         while ($cnt > 0 && defined $lines[$ln - 1] &&
2478                                 $lines[$ln - 1] =~ /^(?:-|..*\\$)/)
2479                         {
2480                                 $ctx .= $rawlines[$ln - 1] . "\n";
2481                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
2482                                 $ln++;
2483                         }
2484                         $ctx .= $rawlines[$ln - 1];
2485
2486                         ($dstat, $dcond, $ln, $cnt, $off) =
2487                                 ctx_statement_block($linenr, $ln - $linenr + 1, 0);
2488                         #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
2489                         #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
2490
2491                         # Extract the remainder of the define (if any) and
2492                         # rip off surrounding spaces, and trailing \'s.
2493                         $rest = '';
2494                         while ($off != 0 || ($cnt > 0 && $rest =~ /\\\s*$/)) {
2495                                 #print "ADDING cnt<$cnt> $off <" . substr($lines[$ln - 1], $off) . "> rest<$rest>\n";
2496                                 if ($off != 0 || $lines[$ln - 1] !~ /^-/) {
2497                                         $rest .= substr($lines[$ln - 1], $off) . "\n";
2498                                         $cnt--;
2499                                 }
2500                                 $ln++;
2501                                 $off = 0;
2502                         }
2503                         $rest =~ s/\\\n.//g;
2504                         $rest =~ s/^\s*//s;
2505                         $rest =~ s/\s*$//s;
2506
2507                         # Clean up the original statement.
2508                         if ($args) {
2509                                 substr($dstat, 0, length($dcond), '');
2510                         } else {
2511                                 $dstat =~ s/^.\s*\#\s*define\s+$Ident\s*//;
2512                         }
2513                         $dstat =~ s/$;//g;
2514                         $dstat =~ s/\\\n.//g;
2515                         $dstat =~ s/^\s*//s;
2516                         $dstat =~ s/\s*$//s;
2517
2518                         # Flatten any parentheses and braces
2519                         while ($dstat =~ s/\([^\(\)]*\)/1/ ||
2520                                $dstat =~ s/\{[^\{\}]*\}/1/ ||
2521                                $dstat =~ s/\[[^\{\}]*\]/1/)
2522                         {
2523                         }
2524
2525                         my $exceptions = qr{
2526                                 $Declare|
2527                                 module_param_named|
2528                                 MODULE_PARAM_DESC|
2529                                 DECLARE_PER_CPU|
2530                                 DEFINE_PER_CPU|
2531                                 __typeof__\(|
2532                                 union|
2533                                 struct|
2534                                 \.$Ident\s*=\s*|
2535                                 ^\"|\"$
2536                         }x;
2537                         #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
2538                         if ($rest ne '' && $rest ne ',') {
2539                                 if ($rest !~ /while\s*\(/ &&
2540                                     $dstat !~ /$exceptions/)
2541                                 {
2542                                         ERROR("Macros with multiple statements should be enclosed in a do - while loop\n" . "$here\n$ctx\n");
2543                                 }
2544
2545                         } elsif ($ctx !~ /;/) {
2546                                 if ($dstat ne '' &&
2547                                     $dstat !~ /^(?:$Ident|-?$Constant)$/ &&
2548                                     $dstat !~ /$exceptions/ &&
2549                                     $dstat !~ /^\.$Ident\s*=/ &&
2550                                     $dstat =~ /$Operators/)
2551                                 {
2552                                         ERROR("Macros with complex values should be enclosed in parenthesis\n" . "$here\n$ctx\n");
2553                                 }
2554                         }
2555                 }
2556
2557 # check for missing bracing around if etc
2558                 if ($line =~ /(^.*)\b(?:if|while|for)\b/ &&
2559                         $line !~ /\#\s*if/) {
2560                         my $allowed = 0;
2561
2562                         # Check the pre-context.
2563                         if ($line =~ /(\}.*?)$/) {
2564                                 my $pre = $1;
2565
2566                                 if ($line !~ /else/) {
2567                                         print "APW: ALLOWED: pre<$pre> line<$line>\n"
2568                                                 if $dbg_adv_apw;
2569                                         $allowed = 1;
2570                                 }
2571                         }
2572                         my ($level, $endln, @chunks) =
2573                                 ctx_statement_full($linenr, $realcnt, 1);
2574                         if ($dbg_adv_apw) {
2575                             print "APW: chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
2576                             print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n"
2577                                 if $#chunks >= 1;
2578                         }
2579                         if ($#chunks >= 0 && $level == 0) {
2580                                 my $seen = 0;
2581                                 my $herectx = $here . "\n";
2582                                 my $ln = $linenr - 1;
2583                                 for my $chunk (@chunks) {
2584                                         my ($cond, $block) = @{$chunk};
2585
2586                                         # If the condition carries leading newlines, then count those as offsets.
2587                                         my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
2588                                         my $offset = statement_rawlines($whitespace) - 1;
2589
2590                                         #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
2591
2592                                         # We have looked at and allowed this specific line.
2593                                         $suppress_ifbraces{$ln + $offset} = 1;
2594
2595                                         $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
2596                                         $ln += statement_rawlines($block) - 1;
2597
2598                                         substr($block, 0, length($cond), '');
2599
2600                                         my $spaced_block = $block;
2601                                         $spaced_block =~ s/\n\+/ /g;
2602
2603                                         $seen++ if ($spaced_block =~ /^\s*\{/);
2604
2605                                         print "APW: cond<$cond> block<$block> allowed<$allowed>\n"
2606                                             if $dbg_adv_apw;
2607                                         if (statement_lines($cond) > 1) {
2608                                             print "APW: ALLOWED: cond<$cond>\n"
2609                                                 if $dbg_adv_apw;
2610                                             $allowed = 1;
2611                                         }
2612                                         if ($block =~/\b(?:if|for|while)\b/) {
2613                                             print "APW: ALLOWED: block<$block>\n"
2614                                                 if $dbg_adv_apw;
2615                                             $allowed = 1;
2616                                         }
2617                                         if (statement_block_size($block) > 1) {
2618                                             print "APW: ALLOWED: lines block<$block>\n"
2619                                                 if $dbg_adv_apw;
2620                                             $allowed = 1;
2621                                         }
2622                                 }
2623                                 if ($seen != ($#chunks + 1) && !$allowed) {
2624                                         ERROR("braces {} are necessary for all arms of this statement\n" . $herectx);
2625                                 }
2626                         }
2627                 }
2628                 if (!defined $suppress_ifbraces{$linenr - 1} &&
2629                                         $line =~ /\b(if|while|for|else)\b/ &&
2630                                         $line !~ /\#\s*if/ &&
2631                                         $line !~ /\#\s*else/) {
2632                         my $allowed = 0;
2633
2634                         # Check the pre-context.
2635                         if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
2636                             my $pre = $1;
2637
2638                             if ($line !~ /else/) {
2639                                 print "APW: ALLOWED: pre<$pre> line<$line>\n"
2640                                     if $dbg_adv_apw;
2641                                 $allowed = 1;
2642                             }
2643                         }
2644
2645                         my ($level, $endln, @chunks) =
2646                                 ctx_statement_full($linenr, $realcnt, $-[0]);
2647
2648                         # Check the condition.
2649                         my ($cond, $block) = @{$chunks[0]};
2650                         print "CHECKING<$linenr> cond<$cond> block<$block>\n"
2651                             if $dbg_adv_checking;
2652                         if (defined $cond) {
2653                                 substr($block, 0, length($cond), '');
2654                         }
2655                         if (statement_lines($cond) > 1) {
2656                             print "APW: ALLOWED: cond<$cond>\n"
2657                                 if $dbg_adv_apw;
2658                             $allowed = 1;
2659                         }
2660                         if ($block =~/\b(?:if|for|while)\b/) {
2661                             print "APW: ALLOWED: block<$block>\n"
2662                                 if $dbg_adv_apw;
2663                             $allowed = 1;
2664                         }
2665                         if (statement_block_size($block) > 1) {
2666                             print "APW: ALLOWED: lines block<$block>\n"
2667                                 if $dbg_adv_apw;
2668                             $allowed = 1;
2669                         }
2670                         # Check the post-context.
2671                         if (defined $chunks[1]) {
2672                                 my ($cond, $block) = @{$chunks[1]};
2673                                 if (defined $cond) {
2674                                         substr($block, 0, length($cond), '');
2675                                 }
2676                                 if ($block =~ /^\s*\{/) {
2677                                     print "APW: ALLOWED: chunk-1 block<$block>\n"
2678                                         if $dbg_adv_apw;
2679                                     $allowed = 1;
2680                                 }
2681                         }
2682                         print "DCS: level=$level block<$block> allowed=$allowed\n"
2683                             if $dbg_adv_dcs;
2684                         if ($level == 0 && $block !~ /^\s*\{/ && !$allowed) {
2685                                 my $herectx = $here . "\n";;
2686                                 my $cnt = statement_rawlines($block);
2687
2688                                 for (my $n = 0; $n < $cnt; $n++) {
2689                                         $herectx .= raw_line($linenr, $n) . "\n";;
2690                                 }
2691
2692                                 ERROR("braces {} are necessary even for single statement blocks\n" . $herectx);
2693                         }
2694                 }
2695
2696 # no volatiles please
2697                 my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
2698                 if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/ &&
2699                     $line !~ /sig_atomic_t/ &&
2700                     !ctx_has_comment($first_line, $linenr)) {
2701                         my $msg = "Use of volatile is usually wrong, please add a comment\n" . $herecurr;
2702                         ERROR($msg);
2703                 }
2704
2705 # warn about #if 0
2706                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
2707                         ERROR("if this code is redundant consider removing it\n" .
2708                                 $herecurr);
2709                 }
2710
2711 # check for needless g_free() checks
2712                 if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
2713                         my $expr = $1;
2714                         if ($line =~ /\bg_free\(\Q$expr\E\);/) {
2715                                 ERROR("g_free(NULL) is safe this check is probably not required\n" . $hereprev);
2716                         }
2717                 }
2718
2719 # warn about #ifdefs in C files
2720 #               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
2721 #                       print "#ifdef in C files should be avoided\n";
2722 #                       print "$herecurr";
2723 #                       $clean = 0;
2724 #               }
2725
2726 # warn about spacing in #ifdefs
2727                 if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
2728                         ERROR("exactly one space required after that #$1\n" . $herecurr);
2729                 }
2730 # check for memory barriers without a comment.
2731                 if ($line =~ /\b(smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
2732                         if (!ctx_has_comment($first_line, $linenr)) {
2733                                 ERROR("memory barrier without comment\n" . $herecurr);
2734                         }
2735                 }
2736 # check of hardware specific defines
2737 # we have e.g. CONFIG_LINUX and CONFIG_WIN32 for common cases
2738 # where they might be necessary.
2739                 if ($line =~ m@^.\s*\#\s*if.*\b__@) {
2740                         WARN("architecture specific defines should be avoided\n" .  $herecurr);
2741                 }
2742
2743 # Check that the storage class is at the beginning of a declaration
2744                 if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
2745                         ERROR("storage class should be at the beginning of the declaration\n" . $herecurr)
2746                 }
2747
2748 # check the location of the inline attribute, that it is between
2749 # storage class and type.
2750                 if ($line =~ /\b$Type\s+$Inline\b/ ||
2751                     $line =~ /\b$Inline\s+$Storage\b/) {
2752                         ERROR("inline keyword should sit between storage class and type\n" . $herecurr);
2753                 }
2754
2755 # check for sizeof(&)
2756                 if ($line =~ /\bsizeof\s*\(\s*\&/) {
2757                         ERROR("sizeof(& should be avoided\n" . $herecurr);
2758                 }
2759
2760 # check for new externs in .c files.
2761                 if ($realfile =~ /\.c$/ && defined $stat &&
2762                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
2763                 {
2764                         my $function_name = $1;
2765                         my $paren_space = $2;
2766
2767                         my $s = $stat;
2768                         if (defined $cond) {
2769                                 substr($s, 0, length($cond), '');
2770                         }
2771                         if ($s =~ /^\s*;/ &&
2772                             $function_name ne 'uninitialized_var')
2773                         {
2774                                 ERROR("externs should be avoided in .c files\n" .  $herecurr);
2775                         }
2776
2777                         if ($paren_space =~ /\n/) {
2778                                 ERROR("arguments for function declarations should follow identifier\n" . $herecurr);
2779                         }
2780
2781                 } elsif ($realfile =~ /\.c$/ && defined $stat &&
2782                     $stat =~ /^.\s*extern\s+/)
2783                 {
2784                         ERROR("externs should be avoided in .c files\n" .  $herecurr);
2785                 }
2786
2787 # check for pointless casting of g_malloc return
2788                 if ($line =~ /\*\s*\)\s*g_(try)?(m|re)alloc(0?)(_n)?\b/) {
2789                         if ($2 == 'm') {
2790                                 ERROR("unnecessary cast may hide bugs, use g_$1new$3 instead\n" . $herecurr);
2791                         } else {
2792                                 ERROR("unnecessary cast may hide bugs, use g_$1renew$3 instead\n" . $herecurr);
2793                         }
2794                 }
2795
2796 # check for gcc specific __FUNCTION__
2797                 if ($line =~ /__FUNCTION__/) {
2798                         ERROR("__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr);
2799                 }
2800
2801 # recommend g_path_get_* over g_strdup(basename/dirname(...))
2802                 if ($line =~ /\bg_strdup\s*\(\s*(basename|dirname)\s*\(/) {
2803                         WARN("consider using g_path_get_$1() in preference to g_strdup($1())\n" . $herecurr);
2804                 }
2805
2806 # recommend qemu_strto* over strto* for numeric conversions
2807                 if ($line =~ /\b(strto[^kd].*?)\s*\(/) {
2808                         ERROR("consider using qemu_$1 in preference to $1\n" . $herecurr);
2809                 }
2810 # recommend sigaction over signal for portability, when establishing a handler
2811                 if ($line =~ /\bsignal\s*\(/ && !($line =~ /SIG_(?:IGN|DFL)/)) {
2812                         ERROR("use sigaction to establish signal handlers; signal is not portable\n" . $herecurr);
2813                 }
2814 # check for module_init(), use category-specific init macros explicitly please
2815                 if ($line =~ /^module_init\s*\(/) {
2816                         ERROR("please use block_init(), type_init() etc. instead of module_init()\n" . $herecurr);
2817                 }
2818 # check for various ops structs, ensure they are const.
2819                 my $struct_ops = qr{AIOCBInfo|
2820                                 BdrvActionOps|
2821                                 BlockDevOps|
2822                                 BlockJobDriver|
2823                                 DisplayChangeListenerOps|
2824                                 GraphicHwOps|
2825                                 IDEDMAOps|
2826                                 KVMCapabilityInfo|
2827                                 MemoryRegionIOMMUOps|
2828                                 MemoryRegionOps|
2829                                 MemoryRegionPortio|
2830                                 QEMUFileOps|
2831                                 SCSIBusInfo|
2832                                 SCSIReqOps|
2833                                 Spice[A-Z][a-zA-Z0-9]*Interface|
2834                                 USBDesc[A-Z][a-zA-Z0-9]*|
2835                                 VhostOps|
2836                                 VMStateDescription|
2837                                 VMStateInfo}x;
2838                 if ($line !~ /\bconst\b/ &&
2839                     $line =~ /\b($struct_ops)\b.*=/) {
2840                         ERROR("initializer for struct $1 should normally be const\n" .
2841                                 $herecurr);
2842                 }
2843
2844 # check for %L{u,d,i} in strings
2845                 my $string;
2846                 while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {
2847                         $string = substr($rawline, $-[1], $+[1] - $-[1]);
2848                         $string =~ s/%%/__/g;
2849                         if ($string =~ /(?<!%)%L[udi]/) {
2850                                 ERROR("\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr);
2851                                 last;
2852                         }
2853                 }
2854
2855 # QEMU specific tests
2856                 if ($rawline =~ /\b(?:Qemu|QEmu)\b/) {
2857                         ERROR("use QEMU instead of Qemu or QEmu\n" . $herecurr);
2858                 }
2859
2860 # Qemu error function tests
2861
2862         # Find newlines in error messages
2863         my $qemu_error_funcs = qr{error_setg|
2864                                 error_setg_errno|
2865                                 error_setg_win32|
2866                                 error_setg_file_open|
2867                                 error_set|
2868                                 error_prepend|
2869                                 warn_reportf_err|
2870                                 error_reportf_err|
2871                                 error_vreport|
2872                                 warn_vreport|
2873                                 info_vreport|
2874                                 error_report|
2875                                 warn_report|
2876                                 info_report|
2877                                 g_test_message}x;
2878
2879         if ($rawline =~ /\b(?:$qemu_error_funcs)\s*\(.*\".*\\n/) {
2880                 ERROR("Error messages should not contain newlines\n" . $herecurr);
2881         }
2882
2883         # Continue checking for error messages that contains newlines. This
2884         # check handles cases where string literals are spread over multiple lines.
2885         # Example:
2886         # error_report("Error msg line #1"
2887         #              "Error msg line #2\n");
2888         my $quoted_newline_regex = qr{\+\s*\".*\\n.*\"};
2889         my $continued_str_literal = qr{\+\s*\".*\"};
2890
2891         if ($rawline =~ /$quoted_newline_regex/) {
2892                 # Backtrack to first line that does not contain only a quoted literal
2893                 # and assume that it is the start of the statement.
2894                 my $i = $linenr - 2;
2895
2896                 while (($i >= 0) & $rawlines[$i] =~ /$continued_str_literal/) {
2897                         $i--;
2898                 }
2899
2900                 if ($rawlines[$i] =~ /\b(?:$qemu_error_funcs)\s*\(/) {
2901                         ERROR("Error messages should not contain newlines\n" . $herecurr);
2902                 }
2903         }
2904
2905 # check for non-portable libc calls that have portable alternatives in QEMU
2906                 if ($line =~ /\bffs\(/) {
2907                         ERROR("use ctz32() instead of ffs()\n" . $herecurr);
2908                 }
2909                 if ($line =~ /\bffsl\(/) {
2910                         ERROR("use ctz32() or ctz64() instead of ffsl()\n" . $herecurr);
2911                 }
2912                 if ($line =~ /\bffsll\(/) {
2913                         ERROR("use ctz64() instead of ffsll()\n" . $herecurr);
2914                 }
2915                 if ($line =~ /\bbzero\(/) {
2916                         ERROR("use memset() instead of bzero()\n" . $herecurr);
2917                 }
2918                 if ($line =~ /\bgetpagesize\(\)/) {
2919                         ERROR("use qemu_real_host_page_size instead of getpagesize()\n" . $herecurr);
2920                 }
2921                 if ($line =~ /\bsysconf\(_SC_PAGESIZE\)/) {
2922                         ERROR("use qemu_real_host_page_size instead of sysconf(_SC_PAGESIZE)\n" . $herecurr);
2923                 }
2924                 my $non_exit_glib_asserts = qr{g_assert_cmpstr|
2925                                                 g_assert_cmpint|
2926                                                 g_assert_cmpuint|
2927                                                 g_assert_cmphex|
2928                                                 g_assert_cmpfloat|
2929                                                 g_assert_true|
2930                                                 g_assert_false|
2931                                                 g_assert_nonnull|
2932                                                 g_assert_null|
2933                                                 g_assert_no_error|
2934                                                 g_assert_error|
2935                                                 g_test_assert_expected_messages|
2936                                                 g_test_trap_assert_passed|
2937                                                 g_test_trap_assert_stdout|
2938                                                 g_test_trap_assert_stdout_unmatched|
2939                                                 g_test_trap_assert_stderr|
2940                                                 g_test_trap_assert_stderr_unmatched}x;
2941                 if ($realfile !~ /^tests\// &&
2942                         $line =~ /\b(?:$non_exit_glib_asserts)\(/) {
2943                         ERROR("Use g_assert or g_assert_not_reached\n". $herecurr);
2944                 }
2945         }
2946
2947         if ($is_patch && $chk_signoff && $signoff == 0) {
2948                 ERROR("Missing Signed-off-by: line(s)\n");
2949         }
2950
2951         # If we have no input at all, then there is nothing to report on
2952         # so just keep quiet.
2953         if ($#rawlines == -1) {
2954                 return 1;
2955         }
2956
2957         # In mailback mode only produce a report in the negative, for
2958         # things that appear to be patches.
2959         if ($mailback && ($clean == 1 || !$is_patch)) {
2960                 return 1;
2961         }
2962
2963         # This is not a patch, and we are are in 'no-patch' mode so
2964         # just keep quiet.
2965         if (!$chk_patch && !$is_patch) {
2966                 return 1;
2967         }
2968
2969         if (!$is_patch) {
2970                 ERROR("Does not appear to be a unified-diff format patch\n");
2971         }
2972
2973         print report_dump();
2974         if ($summary && !($clean == 1 && $quiet == 1)) {
2975                 print "$filename " if ($summary_file);
2976                 print "total: $cnt_error errors, $cnt_warn warnings, " .
2977                         "$cnt_lines lines checked\n";
2978                 print "\n" if ($quiet == 0);
2979         }
2980
2981         if ($quiet == 0) {
2982                 # If there were whitespace errors which cleanpatch can fix
2983                 # then suggest that.
2984 #               if ($rpt_cleaners) {
2985 #                       print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n";
2986 #                       print "      scripts/cleanfile\n\n";
2987 #               }
2988         }
2989
2990         if ($clean == 1 && $quiet == 0) {
2991                 print "$vname has no obvious style problems and is ready for submission.\n"
2992         }
2993         if ($clean == 0 && $quiet == 0) {
2994                 print "$vname has style problems, please review.  If any of these errors\n";
2995                 print "are false positives report them to the maintainer, see\n";
2996                 print "CHECKPATCH in MAINTAINERS.\n";
2997         }
2998
2999         return ($no_warnings ? $clean : $cnt_error == 0);
3000 }