Only copy headers if they've changed.

[openssl.git] / util / copy-if-different.pl

diff --git a/util/copy-if-different.pl b/util/copy-if-different.pl
new file mode 100755 (executable)
index 0000000..47bc0ab
--- /dev/null
+++ b/util/copy-if-different.pl
@@ -0,0 +1,81 @@
+#!/usr/local/bin/perl
+
+use strict;
+
+use Fcntl;
+
+
+# copy-if-different.pl
+
+# Copy to the destination if the source is not the same as it.
+
+my $stripcr = 0;
+
+my @filelist;
+
+foreach my $arg (@ARGV) {
+       $arg =~ s|\\|/|g;       # compensate for bug/feature in cygwin glob...
+       foreach (glob $arg)
+               {
+               push @filelist, $_;
+               }
+}
+
+my $fnum = @filelist;
+
+if ($fnum <= 1)
+       {
+       die "Need at least two filenames";
+       }
+
+my $dest = pop @filelist;
+
+if ($fnum > 2 && ! -d $dest)
+       {
+       die "Destination must be a directory";
+       }
+
+foreach (@filelist)
+       {
+        my $dfile;
+       if (-d $dest)
+               {
+               $dfile = $_;
+               $dfile =~ s|^.*[/\\]([^/\\]*)$|$1|;
+               $dfile = "$dest/$dfile";
+               }
+       else
+               {
+               $dfile = $dest;
+               }
+
+       my $buf;
+       if (-f $dfile)
+               {
+               sysopen(IN, $_, O_RDONLY|O_BINARY) || die "Can't Open $_";
+               sysopen(OUT, $dfile, O_RDONLY|O_BINARY)
+                 || die "Can't Open $dfile";
+               while (sysread IN, $buf, 10240)
+                       {
+                       my $b2;
+                       goto copy if !sysread(OUT, $b2, 10240) || $buf ne $b2;
+                       }
+               goto copy if sysread(OUT, $buf, 1);
+               close(IN);
+               close(OUT);
+               print "NOT copying: $_ to $dfile\n";
+               next;
+               }
+      copy:
+       sysopen(IN, $_, O_RDONLY|O_BINARY) || die "Can't Open $_";
+       sysopen(OUT, $dfile, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY)
+                                       || die "Can't Open $dfile";
+       while (sysread IN, $buf, 10240)
+               {
+               syswrite(OUT, $buf, length($buf));
+               }
+       close(IN);
+       close(OUT);
+       print "Copying: $_ to $dfile\n";
+       }
+