ms/cmp.pl

   1 #!/usr/local/bin/perl
   2
   3 ($#ARGV == 1) || die "usage: cmp.pl <file1> <file2>\n";
   4
   5 open(IN0,"<$ARGV[0]") || die "unable to open $ARGV[0]\n";
   6 open(IN1,"<$ARGV[1]") || die "unable to open $ARGV[1]\n";
   7 binmode IN0;
   8 binmode IN1;
   9
  10 $tot=0;
  11 $ret=1;
  12 for (;;)
  13         {
  14         $n1=sysread(IN0,$b1,4096);
  15         $n2=sysread(IN1,$b2,4096);
  16
  17         last if ($n1 != $n2);
  18         last if ($b1 ne $b2);
  19         last if ($n1 < 0);
  20         if ($n1 == 0)
  21                 {
  22                 $ret=0;
  23                 last;
  24                 }
  25         $tot+=$n1;
  26         }
  27
  28 close(IN0);
  29 close(IN1);
  30 if ($ret)
  31         {
  32         printf STDERR "$ARGV[0] and $ARGV[1] are different\n";
  33         @a1=unpack("C*",$b1);
  34         @a2=unpack("C*",$b2);
  35         for ($i=0; $i<=$#a1; $i++)
  36                 {
  37                 if ($a1[$i] ne $a2[$i])
  38                         {
  39                         printf "%02X %02X <<\n",$a1[$i],$a2[$i];
  40                         last;
  41                         }
  42                 }
  43         $nm=$tot+$n1;
  44         $tot+=$i+1;
  45         printf STDERR "diff at char $tot of $nm\n";
  46         }
  47 exit($ret);