/*

 * Normal distribution table generator

 * Taken from the uncopyrighted NISTnet code.

 */

#include <stdio.h>

#include <stdlib.h>

#include <math.h>

#include <string.h>

#include <limits.h>

#include <linux/types.h>

#include <linux/pkt_sched.h>

#define TABLESIZE 16384

#define TABLEFACTOR NETEM_DIST_SCALE

static double

normal(double x, double mu, double sigma)

{

	return .5 + .5*erf((x-mu)/(sqrt(2.0)*sigma));

}

int

main(int argc, char **argv)

{

	int i, n;

	double x;

	double table[TABLESIZE+1];

	for (x = -10.0; x < 10.05; x += .00005) {

		i = rint(TABLESIZE * normal(x, 0.0, 1.0));

		table[i] = x;

	}

	printf("# This is the distribution table for the normal distribution.\n");

	for (i = n = 0; i < TABLESIZE; i += 4) {

		int value = (int) rint(table[i]*TABLEFACTOR);

		if (value < SHRT_MIN) value = SHRT_MIN;

		if (value > SHRT_MAX) value = SHRT_MAX;

		printf(" %d", value);

		if (++n == 8) {

			putchar('\n');

			n = 0;

		}

	}

	return 0;

}