Mass Deface
)) {
goto fail_inner unless defined($tline = );
if (ref $size) {
# $size contains ref to comparison function
goto fail_inner if &$size($fline, $tline);
} else {
goto fail_inner if $fline ne $tline;
}
}
goto fail_inner if defined($tline = );
}
else {
unless (defined($size) && $size > 0) {
$size = $fromsize || -s TO || 0;
$size = 1024 if $size < 512;
$size = $Too_Big if $size > $Too_Big;
}
my ($fr,$tr,$fbuf,$tbuf);
$fbuf = $tbuf = '';
while(defined($fr = read(FROM,$fbuf,$size)) && $fr > 0) {
unless (defined($tr = read(TO,$tbuf,$fr)) && $tbuf eq $fbuf) {
goto fail_inner;
}
}
goto fail_inner if defined($tr = read(TO,$tbuf,$size)) && $tr > 0;
}
close(TO) || goto fail_open2 if $closeto;
close(FROM) || goto fail_open1 if $closefrom;
return 0;
# All of these contortions try to preserve error messages...
fail_inner:
close(TO) || goto fail_open2 if $closeto;
close(FROM) || goto fail_open1 if $closefrom;
return 1;
fail_open2:
if ($closefrom) {
my $status = $!;
$! = 0;
close FROM;
$! = $status unless $!;
}
fail_open1:
return -1;
}
sub cmp;
*cmp = \&compare;
sub compare_text {
my ($from,$to,$cmp) = @_;
croak("Usage: compare_text( file1, file2 [, cmp-function])")
unless @_ == 2 || @_ == 3;
croak("Third arg to compare_text() function must be a code reference")
if @_ == 3 && ref($cmp) ne 'CODE';
# Using a negative buffer size puts compare into text_mode too
$cmp = -1 unless defined $cmp;
compare($from, $to, $cmp);
}
1;
__END__
=head1 NAME
File::Compare - Compare files or filehandles
=head1 SYNOPSIS
use File::Compare;
if (compare("file1","file2") == 0) {
print "They're equal\n";
}
=head1 DESCRIPTION
The File::Compare::compare function compares the contents of two
sources, each of which can be a file or a file handle. It is exported
from File::Compare by default.
File::Compare::cmp is a synonym for File::Compare::compare. It is
exported from File::Compare only by request.
File::Compare::compare_text does a line by line comparison of the two
files. It stops as soon as a difference is detected. compare_text()
accepts an optional third argument: This must be a CODE reference to
a line comparison function, which returns 0 when both lines are considered
equal. For example:
compare_text($file1, $file2)
is basically equivalent to
compare_text($file1, $file2, sub {$_[0] ne $_[1]} )
=head1 RETURN
File::Compare::compare and its sibling functions return 0 if the files
are equal, 1 if the files are unequal, or -1 if an error was encountered.
=head1 AUTHOR
File::Compare was written by Nick Ing-Simmons.
Its original documentation was written by Chip Salzenberg.
=cut