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