LXR iproute2/netem/pareto.c

   1/* SPDX-License-Identifier: NIST-PD */
   2/*
   3 * Pareto distribution table generator
   4 * Taken from the uncopyrighted NISTnet code.
   5 */
   6#include <stdio.h>
   7#include <stdlib.h>
   8#include <math.h>
   9#include <limits.h>
  10
  11#include <linux/types.h>
  12#include <linux/pkt_sched.h>
  13
  14static const double a=3.0;
  15#define TABLESIZE       16384
  16#define TABLEFACTOR     NETEM_DIST_SCALE
  17
  18int
  19main(int argc, char **argv)
  20{
  21        int i, n;
  22        double dvalue;
  23
  24        printf("# This is the distribution table for the pareto distribution.\n");
  25
  26        for (i = 65536, n = 0; i > 0; i -= 16) {
  27                dvalue = (double)i/(double)65536;
  28                dvalue = 1.0/pow(dvalue, 1.0/a);
  29                dvalue -= 1.5;
  30                dvalue *= (4.0/3.0)*(double)TABLEFACTOR;
  31                if (dvalue > 32767)
  32                        dvalue = 32767;
  33
  34                printf(" %d", (int)rint(dvalue));
  35                if (++n == 8) {
  36                        putchar('\n');
  37                        n = 0;
  38                }
  39        }
  40
  41        return 0;
  42}
  43