1 files changed, 14 insertions, 0 deletions
diff --git a/src/libstddjb/tain_add.c b/src/libstddjb/tain_add.c
new file mode 100644
index 0000000..6c6a237
--- /dev/null
+++ b/src/libstddjb/tain_add.c
@@ -0,0 +1,14 @@
+/* ISC license. */
+
+#include <skalibs/tai.h>
+
+void tain_add (tain_t *t, tain_t const *u, tain_t const *v)
+{
+  tai_add(&t->sec, &u->sec, &v->sec) ;
+  t->nano = u->nano + v->nano ;
+  if (t->nano > 999999999U)
+  {
+    t->nano -= 1000000000U ;
+    tai_u64(&t->sec, tai_sec(&t->sec)+1) ;
+  }
+}