1 files changed, 20 insertions, 0 deletions

diff --git a/lib/raid6/unroll.awk b/lib/raid6/unroll.awk
new file mode 100644
index 000000000000..c6aa03631df8
--- /dev/null
+++ b/lib/raid6/unroll.awk
@@ -0,0 +1,20 @@
+
+# This filter requires one command line option of form -vN=n
+# where n must be a decimal number.
+#
+# Repeat each input line containing $$ n times, replacing $$ with 0...n-1.
+# Replace each $# with n, and each $* with a single $.
+
+BEGIN {
+        n = N + 0
+}
+{
+        if (/\$\$/) { rep = n } else { rep = 1 }
+        for (i = 0; i < rep; ++i) {
+                tmp = $0
+                gsub(/\$\$/, i, tmp)
+                gsub(/\$\#/, n, tmp)
+                gsub(/\$\*/, "$", tmp)
+                print tmp
+        }
+}