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      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 (at) 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 
     26 static void est_help(void);
     27 
     28 static 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 
     37 int 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