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uptime: rewrite in awk

--- a/rc/bin/uptime

+++ b/rc/bin/uptime

@@ -1,8 +1,13 @@

-#!/bin/rc

-clock=`{cat /dev/time}

-xx=`{{echo $clock(3) / $clock(4); echo '_/86400'}|hoc|sed 's/^\./0./g;s/\..*//g'}

-sec=$xx(1)

-days=$xx(2)

-cat /dev/sysname

-echo -n ' up '$days' days, '

-timezone='MDT -21600' date $sec |awk '{print $4}'

+#!/bin/awk -f

+

+BEGIN{

+	getline sysname < "/dev/sysname";

+

+	getline < "/dev/time";

+	sec = sprintf("%d", $3/$4);

+

+	ct = sprintf("%02d:%02d:%02d", sec%86400/3600, sec%86400%3600/60, sec%60);

+	printf("%s up %d days, %s\n", sysname, sec/86400, ct);

+

+	exit

+}