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