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util: add functions for zeroing and comparing NTP timestamps

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This commit is contained in:
Miroslav Lichvar
2016-10-24 16:46:29 +02:00
parent 0e273939d2
commit 6e9c04896b
4 changed files with 67 additions and 30 deletions
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36
util.c
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@@ -679,6 +679,42 @@ UTI_DoubleToNtp32(double x)
/* ================================================== */
void
UTI_ZeroNtp64(NTP_int64 *ts)
{
ts->hi = ts->lo = htonl(0);
}
/* ================================================== */
int
UTI_IsZeroNtp64(NTP_int64 *ts)
{
return !ts->hi && !ts->lo;
}
/* ================================================== */
int
UTI_CompareNtp64(NTP_int64 *a, NTP_int64 *b)
{
int32_t diff;
if (a->hi == b->hi && a->lo == b->lo)
return 0;
diff = ntohl(a->hi) - ntohl(b->hi);
if (diff < 0)
return -1;
if (diff > 0)
return 1;
return ntohl(a->lo) < ntohl(b->lo) ? -1 : 1;
}
/* ================================================== */
/* Seconds part of NTP timestamp correponding to the origin of the time_t format */
#define JAN_1970 0x83aa7e80UL