1 files changed, 10 insertions, 0 deletions
diff --git a/src/libstddjb/tain_half.c b/src/libstddjb/tain_half.c
new file mode 100644
index 0000000..a95072e
--- /dev/null
+++ b/src/libstddjb/tain_half.c
@@ -0,0 +1,10 @@
+/* ISC license. */
+
+#include <skalibs/tai.h>
+
+void tain_half (tain_t *t, tain_t const *u)
+{
+  t->nano = u->nano>>1 ;
+  if (tai_sec(&u->sec) & 1) t->nano += 500000000U ;
+  tai_u64(&t->sec, tai_sec(&u->sec)>>1) ;
+}