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/* ISC license. */
#include <skalibs/sgetopt.h>
#include <skalibs/types.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/strerr2.h>
#include <skalibs/tai.h>
#define USAGE "s6-clockadd [ -f ] [ -e errmax ]"
#define dieusage() strerr_dieusage(100, USAGE)
int main (int argc, char const *const *argv)
{
tain now, adj ;
unsigned int emax = 2000 ;
int flagforce = 0 ;
PROG = "s6-clockadd" ;
{
subgetopt l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "fe:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'f' : flagforce = 1 ; break ;
case 'e' : if (!uint0_scan(l.arg, &emax)) dieusage() ; break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
}
{
char buf[TAIN_PACK] ;
if (allread(0, buf, TAIN_PACK) < TAIN_PACK)
strerr_diefu1sys(111, "read 16 bytes from stdin") ;
tain_unpack(buf, &adj) ;
}
tain_from_millisecs(&now, emax) ;
if (tain_less(&now, &adj))
{
tain tmp = TAIN_ZERO ;
tain_sub(&tmp, &tmp, &adj) ;
if (tain_less(&now, &tmp))
{
char fmt[UINT_FMT] ;
fmt[uint_fmt(fmt, emax)] = 0 ;
if (flagforce)
strerr_warnw3x("time discrepancy bigger than ", fmt, " milliseconds") ;
else
strerr_dief3x(1, "time discrepancy bigger than ", fmt, " milliseconds") ;
}
}
if (!sysclock_get(&now)) strerr_diefu1sys(111, "sysclock_get") ;
tain_add(&now, &now, &adj) ;
if (!sysclock_set(&now)) strerr_diefu1sys(111, "sysclock_set") ;
return 0 ;
}
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