[PATCH] update checkpatch.pl to version 0.04

From: Andy Whitcroft
Date: Fri Jun 08 2007 - 05:20:58 EST


This version brings a some new tests, and a host of changes to fix
false positives, of particular note:

- check for and report #if 0
- extend checking of line lengths and spacing for .pl, .sh etc
- extends the pointer type checks to multiple levels
- updates printk handling to track newlines
- adds a wrapped patch detector
- drops the leading component of the filenames
- extends switch indent handling to switch statmentes rooted in
the context
- adds foo * bar single pointer checks

Signed-off-by: Andy Whitcroft <apw@xxxxxxxxxxxx>
---

This version of checkpatch.pl can be found at the following URL:

http://www.shadowen.org/~apw/public/checkpatch/checkpatch.pl-0.04

Full Changelog:

Andy Whitcroft (16):
allow checking line lengths and spacing on other source files
clean up that whitespace
sanitise the input line standardising the content of quotes
clean up pointer type * and space checks
fix up the sanitiser so it maintains the line length
apply the printk facility checks only to the first printk in a set
switch/case indent checks may anchor in the context
add a wrapped patch detector
put the #ifdef in C file checks on ice
asm volatile is acceptable
check for and report #if 0
drop the leading component of the filename as patches are -p1
use the original line when reporting operator errors
correct spelling of Joel's name
Version: 0.04
add support for struct foo * bar checks

Geert Uytterhoeven (1):
Fix checkpatch.pl name in usage template

Randy Dunlap (1):
checkpatch: produce fewer lines of output
---
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 3933952..aea90d3 100644
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1,14 +1,15 @@
#!/usr/bin/perl -w
# (c) 2001, Dave Jones. <davej@xxxxxxxxxxxxxxxxx> (the file handling bit)
-# (c) 2005, Joel Scohpp <jschopp@xxxxxxxxxxxxxx> (the ugly bit)
+# (c) 2005, Joel Schopp <jschopp@xxxxxxxxxxxxxx> (the ugly bit)
# (c) 2007, Andy Whitcroft <apw@xxxxxxxxxx> (new conditions, test suite, etc)
# Licensed under the terms of the GNU GPL License version 2

use strict;

my $P = $0;
+$P =~ s@.*/@@g;

-my $V = '0.03';
+my $V = '0.04';

use Getopt::Long qw(:config no_auto_abbrev);

@@ -26,7 +27,7 @@ GetOptions(
my $exit = 0;

if ($#ARGV < 0) {
- print "usage: patchstylecheckemail.pl [options] patchfile\n";
+ print "usage: $P [options] patchfile\n";
print "version: $V\n";
print "options: -q => quiet\n";
print " --no-tree => run without a kernel tree\n";
@@ -59,15 +60,15 @@ if ($tree && -f $removal) {
}
}

-my @lines = ();
+my @rawlines = ();
while (<>) {
chomp;
- push(@lines, $_);
+ push(@rawlines, $_);
if (eof(ARGV)) {
- if (!process($ARGV, @lines)) {
+ if (!process($ARGV, @rawlines)) {
$exit = 1;
}
- @lines = ();
+ @rawlines = ();
}
}

@@ -118,24 +119,57 @@ sub line_stats {
return (length($line), length($white));
}

+sub sanitise_line {
+ my ($line) = @_;
+
+ my $res = '';
+ my $l = '';
+
+ my $quote = '';
+
+ foreach my $c (split(//, $line)) {
+ if ($l ne "\\" && ($c eq "'" || $c eq '"')) {
+ if ($quote eq '') {
+ $quote = $c;
+ $res .= $c;
+ $l = $c;
+ next;
+ } elsif ($quote eq $c) {
+ $quote = '';
+ }
+ }
+ if ($quote && $c ne "\t") {
+ $res .= "X";
+ } else {
+ $res .= $c;
+ }
+
+ $l = $c;
+ }
+
+ return $res;
+}
+
sub ctx_block_get {
my ($linenr, $remain, $outer) = @_;
my $line;
my $start = $linenr - 1;
- my $end = $linenr - 1 + $remain;
my $blk = '';
my @o;
my @c;
my @res = ();

- for ($line = $start; $line < $end; $line++) {
- $blk .= $lines[$line];
+ for ($line = $start; $remain > 0; $line++) {
+ next if ($rawlines[$line] =~ /^-/);
+ $remain--;
+
+ $blk .= $rawlines[$line];

@o = ($blk =~ /\{/g);
@c = ($blk =~ /\}/g);

if (!$outer || (scalar(@o) - scalar(@c)) == 1) {
- push(@res, $lines[$line]);
+ push(@res, $rawlines[$line]);
}

last if (scalar(@o) == scalar(@c));
@@ -158,7 +192,7 @@ sub ctx_locate_comment {
my ($first_line, $end_line) = @_;

# Catch a comment on the end of the line itself.
- my ($current_comment) = ($lines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*$@);
+ my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*$@);
return $current_comment if (defined $current_comment);

# Look through the context and try and figure out if there is a
@@ -166,8 +200,8 @@ sub ctx_locate_comment {
my $in_comment = 0;
$current_comment = '';
for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
- my $line = $lines[$linenr - 1];
- ##warn " $line\n";
+ my $line = $rawlines[$linenr - 1];
+ #warn " $line\n";
if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
$in_comment = 1;
}
@@ -190,7 +224,7 @@ sub ctx_has_comment {
my ($first_line, $end_line) = @_;
my $cmt = ctx_locate_comment($first_line, $end_line);

- ##print "LINE: $lines[$end_line - 1 ]\n";
+ ##print "LINE: $rawlines[$end_line - 1 ]\n";
##print "CMMT: $cmt\n";

return ($cmt ne '');
@@ -205,10 +239,6 @@ sub cat_vet {
return $vet;
}

-sub has_non_quoted {
- return ($_[0] =~ m{$_[1]} and $_[0] !~ m{\".*$_[1].*\"});
-}
-
sub process {
my $filename = shift;
my @lines = @_;
@@ -240,6 +270,7 @@ sub process {
#extract the filename as it passes
if ($line=~/^\+\+\+\s+(\S+)/) {
$realfile=$1;
+ $realfile =~ s@^[^/]*/@@;
$in_comment = 0;
next;
}
@@ -262,7 +293,6 @@ sub process {
# blank context lines so we need to count that too.
if ($line =~ /^( |\+|$)/) {
$realline++;
- $realcnt-- if ($realcnt != 0);

# track any sort of multi-line comment. Obviously if
# the added text or context do not include the whole
@@ -288,11 +318,13 @@ sub process {
($prevline, $stashline) = ($stashline, $line);
($previndent, $stashindent) = ($stashindent, $indent);
}
+ $realcnt-- if ($realcnt != 0);

#make up the handle for any error we report on this line
$here = "#$linenr: ";
$here .= "FILE: $realfile:$realline:" if ($realcnt != 0);

+ my $hereline = "$here\n$line\n";
my $herecurr = "$here\n$line\n\n";
my $hereprev = "$here\n$prevline\n$line\n\n";

@@ -315,21 +347,28 @@ sub process {
}
}

-#ignore lines not being added
- if ($line=~/^[^\+]/) {next;}
+# Check for wrappage within a valid hunk of the file
+ if ($realcnt != 0 && $line !~ m{^(?:\+|-| |$)}) {
+ print "patch seems to be corrupt (line wrapped?) [$realcnt]\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+
+#ignore lines being removed
+ if ($line=~/^-/) {next;}

-# check we are in a valid source file *.[hcsS] if not then ignore this hunk
- next if ($realfile !~ /\.[hcsS]$/);
+# check we are in a valid source file if not then ignore this hunk
+ next if ($realfile !~ /\.(h|c|s|S|pl|sh)$/);

#trailing whitespace
- if ($line=~/\S\s+$/) {
+ if ($line=~/\+.*\S\s+$/) {
my $herevet = "$here\n" . cat_vet($line) . "\n\n";
print "trailing whitespace\n";
print "$herevet";
$clean = 0;
}
#80 column limit
- if (!($prevline=~/\/\*\*/) && $length > 80) {
+ if ($line =~ /^\+/ && !($prevline=~/\/\*\*/) && $length > 80) {
print "line over 80 characters\n";
print "$herecurr";
$clean = 0;
@@ -353,19 +392,59 @@ sub process {
#
next if ($in_comment);

+ # Remove comments from the line before processing.
+ $line =~ s@/\*.*\*/@@g;
+ $line =~ s@/\*.*@@;
+ $line =~ s@.*\*/@@;
+
+ #
+ # Checks which may be anchored in the context.
+ #
+
+ # Check for switch () and associated case and default
+ # statements should be at the same indent.
+ if ($line=~/\bswitch\s*\(.*\)/) {
+ my $err = '';
+ my $sep = '';
+ my @ctx = ctx_block_outer($linenr, $realcnt);
+ shift(@ctx);
+ for my $ctx (@ctx) {
+ my ($clen, $cindent) = line_stats($ctx);
+ if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
+ $indent != $cindent) {
+ $err .= "$sep$ctx\n";
+ $sep = '';
+ } else {
+ $sep = "[...]\n";
+ }
+ }
+ if ($err ne '') {
+ print "switch and case should be at the same indent\n";
+ print "$here\n$line\n$err\n";
+ $clean = 0;
+ }
+ }
+
+#ignore lines not being added
+ if ($line=~/^[^\+]/) {next;}
+
+ #
+ # Checks which are anchored on the added line.
+ #
+
# no C99 // comments
- if (has_non_quoted($line, '//')) {
+ if ($line =~ m{//}) {
print "do not use C99 // comments\n";
print "$herecurr";
$clean = 0;
}
-
- # Remove comments from the line before processing.
- $line =~ s@/\*.*\*/@@g;
- $line =~ s@/\*.*@@;
- $line =~ s@.*\*/@@;
+ # Remove C99 comments.
$line =~ s@//.*@@;

+ # Standardise the strings and chars within the input
+ # to simplify matching.
+ $line = sanitise_line($line);
+
#EXPORT_SYMBOL should immediately follow its function closing }.
if (($line =~ /EXPORT_SYMBOL.*\(.*\)/) ||
($line =~ /EXPORT_UNUSED_SYMBOL.*\(.*\)/)) {
@@ -393,8 +472,28 @@ sub process {
}

# * goes on variable not on type
- if ($line=~/[A-Za-z\d_]+\* [A-Za-z\d_]+/) {
- print "\"foo* bar\" should be \"foo *bar\"\n";
+ my $type = '(?:char|short|int|long|unsigned|float|double|' .
+ 'struct\s+[A-Za-z\d_]+|' .
+ 'union\s+[A-Za-z\d_]+)';
+
+ if ($line =~ m{[A-Za-z\d_]+(\*+) [A-Za-z\d_]+}) {
+ print "\"foo$1 bar\" should be \"foo $1bar\"\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+ if ($line =~ m{$type (\*) [A-Za-z\d_]+} ||
+ $line =~ m{[A-Za-z\d_]+ (\*\*+) [A-Za-z\d_]+}) {
+ print "\"foo $1 bar\" should be \"foo $1bar\"\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+ if ($line =~ m{\([A-Za-z\d_\s]+[A-Za-z\d_](\*+)\)}) {
+ print "\"(foo$1)\" should be \"(foo $1)\"\n";
+ print "$herecurr";
+ $clean = 0;
+ }
+ if ($line =~ m{\([A-Za-z\d_\s]+[A-Za-z\d_]\s+(\*+)\s+\)}) {
+ print "\"(foo $1 )\" should be \"(foo $1)\"\n";
print "$herecurr";
$clean = 0;
}
@@ -406,11 +505,29 @@ sub process {
# $clean = 0;
# }

-# printk should use KERN_* levels
+# printk should use KERN_* levels. Note that follow on printk's on the
+# same line do not need a level, so we use the current block context
+# to try and find and validate the current printk. In summary the current
+# printk includes all preceeding printk's which have no newline on the end.
+# we assume the first bad printk is the one to report.
if ($line =~ /\bprintk\((?!KERN_)/) {
- print "printk() should include KERN_ facility level\n";
- print "$herecurr";
- $clean = 0;
+ my $ok = 0;
+ for (my $ln = $linenr - 1; $ln >= $first_line; $ln--) {
+ #print "CHECK<$lines[$ln - 1]\n";
+ # we have a preceeding printk if it ends
+ # with "\n" ignore it, else it is to blame
+ if ($lines[$ln - 1] =~ m{\bprintk\(}) {
+ if ($rawlines[$ln - 1] !~ m{\\n"}) {
+ $ok = 1;
+ }
+ last;
+ }
+ }
+ if ($ok == 0) {
+ print "printk() should include KERN_ facility level\n";
+ print "$herecurr";
+ $clean = 0;
+ }
}

#function brace can't be on same line, except for #defines of do while, or if closed on same line
@@ -425,11 +542,11 @@ sub process {
# will therefore also expand that way.
my $opline = $line;
$opline = expand_tabs($opline);
- $opline =~ s/^.//;
+ $opline =~ s/^./ /;
if (!($line=~/\#\s*include/)) {
# Check operator spacing.
my @elements = split(/(<<=|>>=|<=|>=|==|!=|\+=|-=|\*=|\/=|%=|\^=|\|=|&=|->|<<|>>|<|>|=|!|~|&&|\|\||,|\^|\+\+|--|;|&|\||\+|-|\*|\/\/|\/)/, $opline);
- my $off = 1;
+ my $off = 0;
for (my $n = 0; $n < $#elements; $n += 2) {
$off += length($elements[$n]);

@@ -452,16 +569,21 @@ sub process {
$c = 'E';
}

+ # Pick up the preceeding and succeeding characters.
+ my $ca = substr($opline, $off - 1, 1);
+ my $cc = '';
+ if (length($opline) > ($off + length($elements[$n]))) {
+ $cc = substr($opline, $off + 1 + length($elements[$n]), 1);
+ }
+
my $ctx = "${a}x${c}";

my $at = "(ctx:$ctx)";

my $ptr = (" " x $off) . "^";
- my $hereptr = "$here\n$line\n$ptr\n\n";
+ my $hereptr = "$hereline$ptr\n\n";

##print "<$s1:$op:$s2> <$elements[$n]:$elements[$n + 1]:$elements[$n + 2]>\n";
- # Skip things apparently in quotes.
- next if ($line=~/\".*\Q$op\E.*\"/ or $line=~/\'\Q$op\E\'/);

# We need ; as an operator. // is a comment.
if ($op eq ';' or $op eq '//') {
@@ -515,20 +637,26 @@ sub process {
#
# - is the same
#
- # * is the same only adding:
- # type:
- # (foo *)
- # (foo **)
- #
} elsif ($op eq '&' or $op eq '-') {
- if ($ctx !~ /VxV|[EWB]x[WE]|[EWB]x[VO]/) {
+ if ($ctx !~ /VxV|[EW]x[WE]|[EWB]x[VO]/) {
print "need space before that '$op' $at\n";
print "$hereptr";
$clean = 0;
}

+ # * is the same as & only adding:
+ # type:
+ # (foo *)
+ # (foo **)
+ #
} elsif ($op eq '*') {
- if ($ctx !~ /VxV|[EWB]x[WE]|[EWB]x[VO]|[EWO]x[OBV]/) {
+ if ($ca eq '*') {
+ if ($cc =~ /\s/) {
+ print "no space after that '$op' $at\n";
+ print "$hereptr";
+ $clean = 0;
+ }
+ } elsif ($ctx !~ /VxV|[EW]x[WE]|[EWB]x[VO]|OxV|WxB/) {
print "need space before that '$op' $at\n";
print "$hereptr";
$clean = 0;
@@ -578,6 +706,7 @@ sub process {

# Check for illegal assignment in if conditional.
if ($line=~/\b(if|while)\s*\(.*[^<>!=]=[^=].*\)/) {
+ #next if ($line=~/\".*\Q$op\E.*\"/ or $line=~/\'\Q$op\E\'/);
print "do not use assignment in condition\n";
print "$herecurr";
$clean = 0;
@@ -592,30 +721,6 @@ sub process {
$clean = 0;
}

- # Check for switch () and associated case and default
- # statements should be at the same indent.
- if ($line=~/\bswitch\s*\(.*\)/) {
- my $err = '';
- my $sep = '';
- my @ctx = ctx_block_outer($linenr, $realcnt);
- shift(@ctx);
- for my $ctx (@ctx) {
- my ($clen, $cindent) = line_stats($ctx);
- if ($ctx =~ /\s*(case\s+|default:)/ &&
- $indent != $cindent) {
- $err .= "$sep$ctx\n";
- $sep = '';
- } else {
- $sep = "[...]\n";
- }
- }
- if ($err ne '') {
- print "switch and case should be at the same indent\n";
- print "$here\n$line\n$err\n";
- $clean = 0;
- }
- }
-
#studly caps, commented out until figure out how to distinguish between use of existing and adding new
# if (($line=~/[\w_][a-z\d]+[A-Z]/) and !($line=~/print/)) {
# print "No studly caps, use _\n";
@@ -645,12 +750,12 @@ sub process {
my @opened = $prevline=~/\(/g;
my @closed = $prevline=~/\)/g;
my $nr_line = $linenr;
- my $remaining = $realcnt;
+ my $remaining = $realcnt - 1;
my $next_line = $line;
my $extra_lines = 0;
my $display_segment = $prevline;

- while ($remaining > 1 && scalar @opened > scalar @closed) {
+ while ($remaining > 0 && scalar @opened > scalar @closed) {
$prevline .= $next_line;
$display_segment .= "\n" . $next_line;
$next_line = $lines[$nr_line];
@@ -689,7 +794,7 @@ sub process {

# don't use deprecated functions
for my $func (@dep_functions) {
- if (has_non_quoted($line, '\b' . $func . '\b')) {
+ if ($line =~ /\b$func\b/) {
print "Don't use $func(): see Documentation/feature-removal-schedule.txt\n";
print "$herecurr";
$clean = 0;
@@ -697,19 +802,26 @@ sub process {
}

# no volatiles please
- if (has_non_quoted($line, '\bvolatile\b')) {
+ if ($line =~ /\bvolatile\b/ && $line !~ /\basm\s+volatile\b/) {
print "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n";
print "$herecurr";
$clean = 0;
}

-# warn about #ifdefs in C files
- if ($line =~ /^.#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
- print "#ifdef in C files should be avoided\n";
+# warn about #if 0
+ if ($line =~ /^.#\s*if\s+0\b/) {
+ print "#if 0 -- if this code redundant remove it\n";
print "$herecurr";
$clean = 0;
}

+# warn about #ifdefs in C files
+# if ($line =~ /^.#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
+# print "#ifdef in C files should be avoided\n";
+# print "$herecurr";
+# $clean = 0;
+# }
+
# check for spinlock_t definitions without a comment.
if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/) {
my $which = $1;
-
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