Added awk script relpath.awk to calculate relative paths.

diff --git a/WHATS_NEW b/WHATS_NEW
index cac4190965c5d663a9ae5631a7cd1c69fbca54a9..4571482aa498547f9fa59b7a479c0309ceed3b53 100644 (file)
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,6 @@
 Version 2.02.64 -
 =================================
+  Added awk script relpath.awk to calculate relative paths.
 
 Version 2.02.63 - 14th April 2010
 =================================

diff --git a/scripts/relpath.awk b/scripts/relpath.awk
new file mode 100755 (executable)
index 0000000..26fe1ee
--- /dev/null
+++ b/scripts/relpath.awk
@@ -0,0 +1,40 @@
+#!/usr/bin/awk -f
+#
+# Copyright (C) 2010 Red Hat, Inc. All rights reserved.
+#
+# This file is part of LVM2.
+#
+# This copyrighted material is made available to anyone wishing to use,
+# modify, copy, or redistribute it subject to the terms and conditions
+# of the GNU General Public License v.2.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+# relpath.awk: Script is used to calculate relative path
+#             between two real absolute paths.
+#
+# echo /a/b/c/d  /a/b/e/f | relpath.awk
+# -> ../../e/f/
+
+{
+       split($1, from, "/");
+       split($2, to, "/") ;
+       l = 1;
+       while (l <= length(from) && l <= length(to) && from[l] == to[l])
+               l++;
+       for (i = l; i <= length(from) && length(from[i]); i++) {
+               if (i > l)
+                       p = sprintf("%s/", p);
+               p = sprintf("%s..", p);
+       }
+       for (i = l; i <= length(to) && length(to[i]); i++) {
+               if (length(p) > 0)
+                       p = sprintf("%s/", p);
+               p = sprintf("%s%s", p, to[i]);
+       }
+       if (length(p))
+               p = sprintf("%s/", p);
+       print p
+}