1 files changed, 17 insertions, 0 deletions
diff --git a/src/libstddjb/tain_from_ntp.c b/src/libstddjb/tain_from_ntp.c
new file mode 100644
index 0000000..6bf7697
--- /dev/null
+++ b/src/libstddjb/tain_from_ntp.c
@@ -0,0 +1,17 @@
+/* ISC license. */
+
+#include <skalibs/uint64.h>
+#include <skalibs/tai.h>
+#include <skalibs/djbtime.h>
+
+int tain_from_ntp (tain_t *a, uint64 u)
+{
+  tai_t secs = { u >> 32 } ;
+  if (secs.x <= 0x7FFFFFFFUL) secs.x |= ((uint64)1 << 32) ;
+  secs.x += TAI_MAGIC ;
+  secs.x -= NTP_OFFSET ;
+  if (!tai_from_utc(&secs, secs.x)) return 0 ;
+  a->sec = secs ;
+  a->nano = ((u & 0xFFFFFFFFUL) * 1000000000) >> 32 ;
+  return 1 ;
+}