epan/timestats.c

   1 /* timestats.c
   2  * routines for time statistics
   3  * Copyright 2003 Lars Roland
   4  *
   5  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * SPDX-License-Identifier: GPL-2.0-or-later
  10  */
  11
  12 #include "config.h"
  13
  14 #include "timestats.h"
  15
  16 /* Initialize a timestat_t struct */
  17 void
  18 time_stat_init(timestat_t *stats)
  19 {
  20         stats->num = 0;
  21         stats->min_num = 0;
  22         stats->max_num = 0;
  23         nstime_set_zero(&stats->min);
  24         nstime_set_zero(&stats->max);
  25         nstime_set_zero(&stats->tot);
  26         stats->variance = 0.0;
  27 }
  28
  29 /* Update a timestat_t struct with a new sample */
  30 void
  31 time_stat_update(timestat_t *stats, const nstime_t *delta, packet_info *pinfo)
  32 {
  33         if(stats->num==0){
  34                 stats->max=*delta;
  35                 stats->max_num=pinfo->num;
  36                 stats->min=*delta;
  37                 stats->min_num=pinfo->num;
  38         }
  39
  40         if( (delta->secs<stats->min.secs)
  41         ||( (delta->secs==stats->min.secs)
  42           &&(delta->nsecs<stats->min.nsecs) ) ){
  43                 stats->min=*delta;
  44                 stats->min_num=pinfo->num;
  45         }
  46
  47         if( (delta->secs>stats->max.secs)
  48         ||( (delta->secs==stats->max.secs)
  49           &&(delta->nsecs>stats->max.nsecs) ) ){
  50                 stats->max=*delta;
  51                 stats->max_num=pinfo->num;
  52         }
  53
  54         nstime_add(&stats->tot, delta);
  55
  56         stats->num++;
  57 }
  58
  59 /*
  60  * get_average - function
  61  *
  62  * function to calculate the average
  63  * returns the average as a double , time base is milli seconds
  64  */
  65
  66 double get_average(const nstime_t *sum, uint32_t num)
  67 {
  68         double average;
  69
  70         if(num > 0) {
  71                 average = (double)sum->secs*1000 + (double)sum->nsecs/1000000;
  72                 average /= num;
  73         }
  74         else {
  75                 average = 0;
  76         }
  77         return average;
  78 }
  79
  80 /*
  81  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
  82  *
  83  * Local variables:
  84  * c-basic-offset: 8
  85  * tab-width: 8
  86  * indent-tabs-mode: t
  87  * End:
  88  *
  89  * vi: set shiftwidth=8 tabstop=8 noexpandtab:
  90  * :indentSize=8:tabSize=8:noTabs=false:
  91  */