util/copy-if-different.pl

   1 #!/usr/local/bin/perl
   2
   3 use strict;
   4
   5 use Fcntl;
   6
   7
   8 # copy-if-different.pl
   9
  10 # Copy to the destination if the source is not the same as it.
  11
  12 my $stripcr = 0;
  13
  14 my @filelist;
  15
  16 foreach my $arg (@ARGV) {
  17         $arg =~ s|\\|/|g;       # compensate for bug/feature in cygwin glob...
  18         foreach (glob $arg)
  19                 {
  20                 push @filelist, $_;
  21                 }
  22 }
  23
  24 my $fnum = @filelist;
  25
  26 if ($fnum <= 1)
  27         {
  28         die "Need at least two filenames";
  29         }
  30
  31 my $dest = pop @filelist;
  32
  33 if ($fnum > 2 && ! -d $dest)
  34         {
  35         die "Destination must be a directory";
  36         }
  37
  38 foreach (@filelist)
  39         {
  40         my $dfile;
  41         if (-d $dest)
  42                 {
  43                 $dfile = $_;
  44                 $dfile =~ s|^.*[/\\]([^/\\]*)$|$1|;
  45                 $dfile = "$dest/$dfile";
  46                 }
  47         else
  48                 {
  49                 $dfile = $dest;
  50                 }
  51
  52         my $buf;
  53         if (-f $dfile)
  54                 {
  55                 sysopen(IN, $_, O_RDONLY|O_BINARY) || die "Can't Open $_";
  56                 sysopen(OUT, $dfile, O_RDONLY|O_BINARY)
  57                   || die "Can't Open $dfile";
  58                 while (sysread IN, $buf, 10240)
  59                         {
  60                         my $b2;
  61                         goto copy if !sysread(OUT, $b2, 10240) || $buf ne $b2;
  62                         }
  63                 goto copy if sysread(OUT, $buf, 1);
  64                 close(IN);
  65                 close(OUT);
  66                 print "NOT copying: $_ to $dfile\n";
  67                 next;
  68                 }
  69       copy:
  70         sysopen(IN, $_, O_RDONLY|O_BINARY) || die "Can't Open $_";
  71         sysopen(OUT, $dfile, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY)
  72                                         || die "Can't Open $dfile";
  73         while (sysread IN, $buf, 10240)
  74                 {
  75                 syswrite(OUT, $buf, length($buf));
  76                 }
  77         close(IN);
  78         close(OUT);
  79         print "Copying: $_ to $dfile\n";
  80         }
  81