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-rw-r--r--netem/pareto.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/netem/pareto.c b/netem/pareto.c
new file mode 100644
index 0000000..51d9437
--- /dev/null
+++ b/netem/pareto.c
@@ -0,0 +1,41 @@
+/*
+ * Pareto distribution table generator
+ * Taken from the uncopyrighted NISTnet code.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <limits.h>
+
+#include <linux/types.h>
+#include <linux/pkt_sched.h>
+
+static const double a=3.0;
+#define TABLESIZE 16384
+#define TABLEFACTOR NETEM_DIST_SCALE
+
+int
+main(int argc, char **argv)
+{
+ int i, n;
+ double dvalue;
+
+ printf("# This is the distribution table for the pareto distribution.\n");
+
+ for (i = 65536, n = 0; i > 0; i -= 16) {
+ dvalue = (double)i/(double)65536;
+ dvalue = 1.0/pow(dvalue, 1.0/a);
+ dvalue -= 1.5;
+ dvalue *= (4.0/3.0)*(double)TABLEFACTOR;
+ if (dvalue > 32767)
+ dvalue = 32767;
+
+ printf(" %d", (int)rint(dvalue));
+ if (++n == 8) {
+ putchar('\n');
+ n = 0;
+ }
+ }
+
+ return 0;
+}