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handled potential overflow in vm_gettime() for __DOS

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hyunghwan.chung 2018-12-01 06:15:31 +00:00
parent 800429d4db
commit 668f06671f
1 changed files with 20 additions and 10 deletions
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30
moo/lib/std.c
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@ -298,7 +298,7 @@ struct xtn_t
ULONG tc_overflow;
#elif defined(__DOS__)
clock_t tc_last;
clock_t tc_overflow;
moo_ntime_t tc_last_ret;
#endif
#if defined(USE_DEVPOLL)
@ -2151,26 +2151,36 @@ static void vm_gettime (moo_t* moo, moo_ntime_t* now)
#elif defined(__DOS__) && (defined(_INTELC32_) || defined(__WATCOMC__))
xtn_t* xtn = GET_XTN(moo);
clock_t c;
clock_t c, elapsed;
moo_ntime_t et;
/* TODO: handle overflow?? */
c = clock();
if (c < xtn->tc_last) xtn->tc_overflow++;
xtn->tc_last = c;
if (c < xtn->tc_last)
{
elapsed = MOO_TYPE_MAX(clock_t) - xtn->tc_last + c + 1;
}
else
{
elapsed = c - xtn->tc_last;
}
now->sec = c / CLOCKS_PER_SEC;
et.sec = elapsed / CLOCKS_PER_SEC;
#if (CLOCKS_PER_SEC == 100)
now->nsec = MOO_MSEC_TO_NSEC((c % CLOCKS_PER_SEC) * 10);
et.nsec = MOO_MSEC_TO_NSEC((elapsed % CLOCKS_PER_SEC) * 10);
#elif (CLOCKS_PER_SEC == 1000)
now->nsec = MOO_MSEC_TO_NSEC(c % CLOCKS_PER_SEC);
et.nsec = MOO_MSEC_TO_NSEC(elapsed % CLOCKS_PER_SEC);
#elif (CLOCKS_PER_SEC == 1000000L)
now->nsec = MOO_USEC_TO_NSEC(c % CLOCKS_PER_SEC);
et.nsec = MOO_USEC_TO_NSEC(elapsed % CLOCKS_PER_SEC);
#elif (CLOCKS_PER_SEC == 1000000000L)
now->nsec = (c % CLOCKS_PER_SEC);
et.nsec = (elapsed % CLOCKS_PER_SEC);
#else
# error UNSUPPORTED CLOCKS_PER_SEC
#endif
xtn->tc_last = c;
MOO_ADD_NTIME (&xtn->tc_last_ret , &xtn->tc_last_ret, &et);
*now = xtn->tc_last_ret;
#elif defined(macintosh)
UnsignedWide tick;
moo_uint64_t tick64;