144 lines
3 KiB
Perl
144 lines
3 KiB
Perl
package File::Compare;
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use strict;
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use vars qw($VERSION @ISA @EXPORT @EXPORT_OK $Too_Big *FROM *TO);
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require Exporter;
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use Carp;
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$VERSION = '1.1001';
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@ISA = qw(Exporter);
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@EXPORT = qw(compare);
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@EXPORT_OK = qw(cmp);
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$Too_Big = 1024 * 1024 * 2;
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sub VERSION {
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# Version of File::Compare
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return $File::Compare::VERSION;
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}
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sub compare {
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croak("Usage: compare( file1, file2 [, buffersize]) ")
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unless(@_ == 2 || @_ == 3);
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my $from = shift;
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my $to = shift;
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my $closefrom=0;
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my $closeto=0;
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my ($size, $fromsize, $status, $fr, $tr, $fbuf, $tbuf);
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local(*FROM, *TO);
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local($\) = '';
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croak("from undefined") unless (defined $from);
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croak("to undefined") unless (defined $to);
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if (ref($from) &&
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(UNIVERSAL::isa($from,'GLOB') || UNIVERSAL::isa($from,'IO::Handle'))) {
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*FROM = *$from;
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} elsif (ref(\$from) eq 'GLOB') {
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*FROM = $from;
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} else {
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open(FROM,"<$from") or goto fail_open1;
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binmode FROM;
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$closefrom = 1;
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$fromsize = -s FROM;
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}
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if (ref($to) &&
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(UNIVERSAL::isa($to,'GLOB') || UNIVERSAL::isa($to,'IO::Handle'))) {
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*TO = *$to;
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} elsif (ref(\$to) eq 'GLOB') {
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*TO = $to;
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} else {
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open(TO,"<$to") or goto fail_open2;
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binmode TO;
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$closeto = 1;
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}
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if ($closefrom && $closeto) {
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# If both are opened files we know they differ if their size differ
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goto fail_inner if $fromsize != -s TO;
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}
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if (@_) {
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$size = shift(@_) + 0;
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croak("Bad buffer size for compare: $size\n") unless ($size > 0);
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} else {
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$size = $fromsize;
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$size = 1024 if ($size < 512);
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$size = $Too_Big if ($size > $Too_Big);
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}
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$fbuf = '';
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$tbuf = '';
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while(defined($fr = read(FROM,$fbuf,$size)) && $fr > 0) {
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unless (defined($tr = read(TO,$tbuf,$fr)) and $tbuf eq $fbuf) {
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goto fail_inner;
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}
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}
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goto fail_inner if (defined($tr = read(TO,$tbuf,$size)) && $tr > 0);
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close(TO) || goto fail_open2 if $closeto;
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close(FROM) || goto fail_open1 if $closefrom;
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return 0;
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# All of these contortions try to preserve error messages...
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fail_inner:
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close(TO) || goto fail_open2 if $closeto;
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close(FROM) || goto fail_open1 if $closefrom;
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return 1;
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fail_open2:
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if ($closefrom) {
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$status = $!;
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$! = 0;
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close FROM;
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$! = $status unless $!;
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}
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fail_open1:
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return -1;
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}
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*cmp = \&compare;
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1;
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__END__
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=head1 NAME
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File::Compare - Compare files or filehandles
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=head1 SYNOPSIS
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use File::Compare;
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if (compare("file1","file2") == 0) {
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print "They're equal\n";
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}
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=head1 DESCRIPTION
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The File::Compare::compare function compares the contents of two
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sources, each of which can be a file or a file handle. It is exported
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from File::Compare by default.
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File::Compare::cmp is a synonym for File::Compare::compare. It is
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exported from File::Compare only by request.
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=head1 RETURN
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File::Compare::compare return 0 if the files are equal, 1 if the
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files are unequal, or -1 if an error was encountered.
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=head1 AUTHOR
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File::Compare was written by Nick Ing-Simmons.
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Its original documentation was written by Chip Salzenberg.
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=cut
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