1/*
2 * m_estimator.c	Parse/print estimator module options.
3 *
4 *		This program is free software; you can u32istribute it and/or
5 *		modify it under the terms of the GNU General Public License
6 *		as published by the Free Software Foundation; either version
7 *		2 of the License, or (at your option) any later version.
8 *
9 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 */
12
13#include <stdio.h>
14#include <stdlib.h>
15#include <unistd.h>
16#include <syslog.h>
17#include <fcntl.h>
18#include <sys/socket.h>
19#include <netinet/in.h>
20#include <arpa/inet.h>
21#include <string.h>
22
23#include "utils.h"
24#include "tc_util.h"
25
26static void est_help(void);
27
28static void est_help(void)
29{
30	fprintf(stderr, "Usage: ... estimator INTERVAL TIME-CONST\n");
31	fprintf(stderr, "  INTERVAL is interval between measurements\n");
32	fprintf(stderr, "  TIME-CONST is averaging time constant\n");
33	fprintf(stderr, "Example: ... est 1sec 8sec\n");
34	return;
35}
36
37int parse_estimator(int *p_argc, char ***p_argv, struct tc_estimator *est)
38{
39	int argc = *p_argc;
40	char **argv = *p_argv;
41	unsigned A, time_const;
42
43	NEXT_ARG();
44	if (est->ewma_log)
45		duparg("estimator", *argv);
46	if (matches(*argv, "help") == 0)
47		est_help();
48	if (get_time(&A, *argv))
49		invarg("estimator", "invalid estimator interval");
50	NEXT_ARG();
51	if (matches(*argv, "help") == 0)
52		est_help();
53	if (get_time(&time_const, *argv))
54		invarg("estimator", "invalid estimator time constant");
55	if (tc_setup_estimator(A, time_const, est) < 0) {
56		fprintf(stderr, "Error: estimator parameters are out of range.\n");
57		return -1;
58	}
59	if (show_raw)
60		fprintf(stderr, "[estimator i=%u e=%u]\n", est->interval, est->ewma_log);
61	*p_argc = argc;
62	*p_argv = argv;
63	return 0;
64}
65