#!/usr/bin/perl
#
# drift of 104.8576 -> +1 tick.
#
# 970306 HMS Deal with nanoseconds.  Fix sign of adjustments.
# 980503 BE  Call tickadj for base value.

$df="/etc/ntp.drift";
$base=`/usr/local/bin/tickadj`;
chomp $base;
$base =~ s/\D*//;  # might be Linux-specific (BE)
$cvt = 2 ** 20 / $base;
$v1=0.;
$v2="";

if (open(DF, $df))
{
    if ($_=)
    {
        ($v1, $v2) = split;
    }

    while ($v1 < 0)
    {
        $v1 += $cvt;
        $base--;
    }

    while ($v1 > $cvt)
    {
        $v1 -= $cvt;
        $base++;
    }
}

printf("%.3f (drift); ", $v1);
printf("%d usec; ", $base);
printf("%d nsec\n", ($base + ($v1/$cvt)) * 1000);