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|
#!/usr/bin/perl
use strict;
use warnings;
if (@ARGV != 3)
{
die "usage: $0 start end ttyrec\n";
}
my $frame = 0;
my $DEC = 0;
my $start = shift || 1;
my $end = shift || -1;
my $prev = '';
my $handle;
open($handle, '<', $ARGV[0]) or die "Unable to open '$ARGV[0]': $!";
while ((my $hgot = read($handle, my $hdr, 12)) > 0)
{
++$frame;
die "Unexpected EOF in '$ARGV[0]' frame $frame header (expected 12 bytes, got $hgot)" if $hgot < 12;
my @hval = unpack "VVV", $hdr;
my $dlen = $hval[2];
my $dgot = read $handle, my ($data), $dlen;
die "Unexpected EOF in '$ARGV[0]' frame $frame data (expected $dlen bytes, got $dgot)" if $dgot < $dlen;
$DEC = 1 if $data =~ /\e\)0/;
if ($frame < $start)
{
# we can modify $data because we're not printing it anyway
$prev = '' if $data =~ s/.*\e\[2J//;
$prev .= $data;
}
if ($frame == $start && $frame > 1)
{
$data = "\e\[2J" . $prev . $data;
$data = "\e)0" . $data if $DEC;
}
$hval[2] = length($data);
$hdr = pack "VVV", @hval;
print "$hdr$data" if $frame >= $start && ($end == -1 || $frame <= $end);
}
|
