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#!/usr/local/bin/perl
($#ARGV == 1) || die "usage: cmp.pl <file1> <file2>\n";
open(IN0,"<$ARGV[0]") || die "unable to open $ARGV[0]\n";
open(IN1,"<$ARGV[1]") || die "unable to open $ARGV[1]\n";
binmode IN0;
binmode IN1;
$tot=0;
$ret=1;
for (;;)
{
$n1=sysread(IN0,$b1,4096);
$n2=sysread(IN1,$b2,4096);
last if ($n1 != $n2);
last if ($b1 ne $b2);
last if ($n1 < 0);
if ($n1 == 0)
{
$ret=0;
last;
}
$tot+=$n1;
}
close(IN0);
close(IN1);
if ($ret)
{
printf STDERR "$ARGV[0] and $ARGV[1] are different\n";
@a1=unpack("C*",$b1);
@a2=unpack("C*",$b2);
for ($i=0; $i<=$#a1; $i++)
{
if ($a1[$i] ne $a2[$i])
{
printf "%02X %02X <<\n",$a1[$i],$a2[$i];
last;
}
}
$nm=$tot+$n1;
$tot+=$i+1;
printf STDERR "diff at char $tot of $nm\n";
}
exit($ret);