144 lines
3.0 KiB
Perl
144 lines
3.0 KiB
Perl
package File::Compare;
|
|
|
|
use strict;
|
|
use vars qw($VERSION @ISA @EXPORT @EXPORT_OK $Too_Big *FROM *TO);
|
|
|
|
require Exporter;
|
|
use Carp;
|
|
|
|
$VERSION = '1.1001';
|
|
@ISA = qw(Exporter);
|
|
@EXPORT = qw(compare);
|
|
@EXPORT_OK = qw(cmp);
|
|
|
|
$Too_Big = 1024 * 1024 * 2;
|
|
|
|
sub VERSION {
|
|
# Version of File::Compare
|
|
return $File::Compare::VERSION;
|
|
}
|
|
|
|
sub compare {
|
|
croak("Usage: compare( file1, file2 [, buffersize]) ")
|
|
unless(@_ == 2 || @_ == 3);
|
|
|
|
my $from = shift;
|
|
my $to = shift;
|
|
my $closefrom=0;
|
|
my $closeto=0;
|
|
my ($size, $fromsize, $status, $fr, $tr, $fbuf, $tbuf);
|
|
local(*FROM, *TO);
|
|
local($\) = '';
|
|
|
|
croak("from undefined") unless (defined $from);
|
|
croak("to undefined") unless (defined $to);
|
|
|
|
if (ref($from) &&
|
|
(UNIVERSAL::isa($from,'GLOB') || UNIVERSAL::isa($from,'IO::Handle'))) {
|
|
*FROM = *$from;
|
|
} elsif (ref(\$from) eq 'GLOB') {
|
|
*FROM = $from;
|
|
} else {
|
|
open(FROM,"<$from") or goto fail_open1;
|
|
binmode FROM;
|
|
$closefrom = 1;
|
|
$fromsize = -s FROM;
|
|
}
|
|
|
|
if (ref($to) &&
|
|
(UNIVERSAL::isa($to,'GLOB') || UNIVERSAL::isa($to,'IO::Handle'))) {
|
|
*TO = *$to;
|
|
} elsif (ref(\$to) eq 'GLOB') {
|
|
*TO = $to;
|
|
} else {
|
|
open(TO,"<$to") or goto fail_open2;
|
|
binmode TO;
|
|
$closeto = 1;
|
|
}
|
|
|
|
if ($closefrom && $closeto) {
|
|
# If both are opened files we know they differ if their size differ
|
|
goto fail_inner if $fromsize != -s TO;
|
|
}
|
|
|
|
if (@_) {
|
|
$size = shift(@_) + 0;
|
|
croak("Bad buffer size for compare: $size\n") unless ($size > 0);
|
|
} else {
|
|
$size = $fromsize;
|
|
$size = 1024 if ($size < 512);
|
|
$size = $Too_Big if ($size > $Too_Big);
|
|
}
|
|
|
|
$fbuf = '';
|
|
$tbuf = '';
|
|
while(defined($fr = read(FROM,$fbuf,$size)) && $fr > 0) {
|
|
unless (defined($tr = read(TO,$tbuf,$fr)) and $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) {
|
|
$status = $!;
|
|
$! = 0;
|
|
close FROM;
|
|
$! = $status unless $!;
|
|
}
|
|
fail_open1:
|
|
return -1;
|
|
}
|
|
|
|
*cmp = \&compare;
|
|
|
|
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.
|
|
|
|
=head1 RETURN
|
|
|
|
File::Compare::compare 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
|
|
|