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#!/usr/bin/perl -w
use DB_File;
use Fcntl ':flock';
if (!defined($ARGV[0])) {
print "usage: requires .class dump as parameter!\n";
exit;
}
sub bailout
{
untie %bcheckdb if(defined(%bcheckdb));
if(defined(MYLOCK)) {
flock MYLOCK, LOCK_UN;
close(MYLOCK);
}
print @_;
exit 5;
}
sub ask_user
{
my ($dbkey, $dbchunk) = @_;
if (defined($ENV{"BCHECK_UPDATE"})) {
$bcheckdb{$dbkey} = $dbchunk;
return;
}
&bailout("BC problem detected") if (! -t STDIN);
print "(I)gnore / (Q)uit / (U)pdate: ";
my $key;
while(defined(read STDIN, $key, 1)) {
$key = lc($key);
print "got: >$key<\n";
return if ($key eq 'i');
&bailout("BC problem. aborted") if ($key eq 'q');
if ($key eq 'u') {
$bcheckdb{$dbkey} = $dbchunk;
return;
}
print "\n(I)gnore / (Q)uit / (U)pdate: ";
}
}
sub diff_chunk($$)
{
my ($oldl, $newl) = @_;
my @old = split /^/m, $oldl;
my @new = split /^/m, $newl;
my $haschanges = 0;
my $max = $#old > $#new ? $#old : $#new;
die "whoops. key different" if ($old[0] ne $new[0]);
if ($#old != $#new) {
warn ("Structural difference.\n");
print @old;
print "-----------------------------------------------\n";
print @new;
$haschanges = 1;
return $haschanges;
}
print $old[0];
my ($class) = ($old[0] =~ /^(?:Class |Vtable for )(\S+)/);
my $c = 1;
while ($c < $max) {
my ($o, $n) = ($old[$c], $new[$c]);
chomp $o;
chomp $n;
$c++;
next if ($o eq $n);
if(defined($class) and $n =~ /^(\d+\s+)\w+(::\S+\s*.*)$/) {
next if ($n eq "$1$class$2");
}
$haschanges = 1;
print "-$o\n+$n\n\n";
}
return $haschanges;
}
local $dblock = $ENV{"HOME"} . "/bcheck.lock";
my $dbfile = $ENV{"HOME"} . "/bcheck.db";
my $cdump = $ARGV[0];
die "file $cdump is not readable: $!" if (! -f $cdump);
# make sure the advisory lock exists
open(MYLOCK, ">$dblock");
print MYLOCK "";
flock MYLOCK, LOCK_EX;
tie %bcheckdb, 'DB_File', $dbfile;
my $chunk = "";
open (IN, "<$cdump") or die "cannot open $cdump: $!";
while (<IN>) {
chop;
s/0x[0-9a-fA-F]+/0x......../g;
s/base size=/size=/g;
s/\(\)\s*$//g;
s/base align=/align=/g;
$chunk .= $_ . "\n";
if(/^\s*$/) {
my @lines = split /^/m, $chunk;
my $key = $lines[0];
chomp $key;
if($key !~ /<anonymous struct>/ &&
$key !~ /<anonymous union>/) {
if(defined($bcheckdb{$key})) {
my $dbversion = $bcheckdb{$key};
if($dbversion ne $chunk) {
&ask_user($key, $chunk) if(&diff_chunk($dbversion, $chunk));
}
}
else {
$bcheckdb{$key} = $chunk;
print "NEW: $key\n";
}
}
$chunk = "";
next;
}
}
close(IN);
untie %bcheckdb;
flock MYLOCK, LOCK_UN;
close(MYLOCK);
exit 0;