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#include <config.h>
#include <glib.h>
#include <time.h>
#include "netspeed.h"
enum { N_STATES = 4 };
struct _NetSpeed
{
LoadGraph *graph;
gulong states[N_STATES];
size_t cur;
};
NetSpeed* netspeed_new(LoadGraph *g)
{
NetSpeed *ns = g_new0(NetSpeed, 1);
ns->graph = g;
return ns;
}
void netspeed_delete(NetSpeed *ns)
{
g_free(ns);
}
void netspeed_add(NetSpeed *ns, gulong tx)
{
ns->cur = (ns->cur + 1) % N_STATES;
ns->states[ns->cur] = tx;
}
/* Something very similar to g_format_size() but for rates.
* This should give the same display as in g-s-m */
static char*
format_rate_for_display(guint rate)
{
char* bytes = g_format_size(rate);
return g_strdup_printf(_("%s/s"), bytes);
}
char* netspeed_get(NetSpeed *ns)
{
gulong older, newer;
guint rate;
newer = ns->states[ns->cur];
older = ns->states[(ns->cur + 1) % N_STATES];
if ((older != 0) && (newer > older))
rate = (newer - older) * 1000 / ((N_STATES - 1) * ns->graph->speed);
else
/* We end up here if we haven't got enough data yet or the
network interface has jumped back (or there has never
been any activity on any interface). A value of 0 is
likely to be accurate, but if it is wrong it will be
clearly wrong. In any event, it should fix itself in a
few seconds. */
rate = 0;
return format_rate_for_display(rate);
}
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