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/*
* twa_t.c:
*
* Copyright (c) 2017 James McKenzie <foss@madingley.org>,
* All rights reserved.
*
*/
#include "project.h"
void
tw_dt_to_tm (TW_DateTime * tw_dt, struct tm *tm)
{
memset (tm, 0, sizeof (*tm));
tm->tm_sec = tw_dt->tw_sec;
tm->tm_min = tw_dt->tw_min;
tm->tm_hour = tw_dt->tw_hour;
tm->tm_mday = tw_dt->tw_day;
tm->tm_mon = tw_dt->tw_month - 1;
tm->tm_year = tw_dt->tw_year - 1900;
}
void
tm_to_tw_dt (struct tm *tm, TW_DateTime * tw_dt)
{
memset (tw_dt, 0, sizeof (*tw_dt));
tw_dt->tw_sec = tm->tm_sec;
tw_dt->tw_min = tm->tm_min;
tw_dt->tw_hour = tm->tm_hour;
tw_dt->tw_day = tm->tm_mday;
tw_dt->tw_month = tm->tm_mon + 1;
tw_dt->tw_year = tm->tm_year + 1900;
}
static int
show_ctrl_time (int fd)
{
TW_DateTime dt;
ssize_t ret;
struct tm tm;
ret =
twa_get_parameter (fd, TW_TIMEKEEP_TABLE, TW_TIMEKEEP_DATETIME, &dt,
sizeof (dt));
if (ret != sizeof (dt))
{
fprintf (stderr, "Failed to get controller time\n");
return -1;
}
tw_dt_to_tm (&dt, &tm);
printf ("Controller time is: %s", asctime (&tm));
return 0;
}
static int
set_ctrl_time (int fd)
{
TW_DateTime dt;
int ret;
struct tm tm;
time_t t;
time (&t);
localtime_r (&t, &tm);
tm_to_tw_dt (&tm, &dt);
ret =
twa_set_parameter (fd, TW_TIMEKEEP_TABLE, TW_TIMEKEEP_DATETIME, &dt,
sizeof (dt));
if (ret)
{
fprintf (stderr, "Failed to set controller time\n");
return -1;
}
return 0;
}
static int
check_ctrl_time (int fd)
{
TW_DateTime dt;
ssize_t ret;
struct tm tm;
time_t ctrl_time, local_time;
double d;
int rc = 0;
ret =
twa_get_parameter (fd, TW_TIMEKEEP_TABLE, TW_TIMEKEEP_DATETIME, &dt,
sizeof (dt));
if (ret != sizeof (dt))
{
fprintf (stderr, "Failed to get controller time\n");
rc |= -1;
return rc;
}
tw_dt_to_tm (&dt, &tm);
printf ("Controller time is: %s", asctime (&tm));
ctrl_time = mktime (&tm);
time (&local_time);
localtime_r (&local_time, &tm);
local_time = mktime (&tm);
d = difftime (local_time, ctrl_time);
printf ("Controller time difference is %.1lf seconds\n", d);
if ((d > 15.0) || (d < -15.0))
{
printf ("Setting controller time\n");
rc |= set_ctrl_time (fd);
rc |= show_ctrl_time (fd);
}
return rc;
}
int
main (int argc, char *argv[])
{
char *dev = "/dev/twa0";
int fd;
int ret = 0;
if (argc == 2)
dev = argv[1];
fd = open (dev, O_RDWR);
if (fd < 0)
{
fprintf (stderr, "Failed to open %s: %m\n", dev);
ret |= -1;
return ret;
}
return check_ctrl_time (fd);
}
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