1 files changed, 21 insertions, 0 deletions
diff --git a/src/sbearssl/sbearssl_dayseconds_from_tai.c b/src/sbearssl/sbearssl_dayseconds_from_tai.c
new file mode 100644
index 0000000..73ab2be
--- /dev/null
+++ b/src/sbearssl/sbearssl_dayseconds_from_tai.c
@@ -0,0 +1,21 @@
+/* ISC license. */
+
+#include <errno.h>
+
+#include <skalibs/uint64.h>
+#include <skalibs/tai.h>
+#include <skalibs/djbtime.h>
+
+#include <s6-networking/sbearssl.h>
+
+int sbearssl_dayseconds_from_tai (uint32_t *days, uint32_t *seconds, tai const *t)
+{
+  uint64_t u, d ;
+  if (!utc_from_tai(&u, t)) return 0 ;
+  u -= TAI_MAGIC ;
+  d = u / 86400 + 719528 ;
+  if (d >= 0xffffffffUL) return (errno = EOVERFLOW, 0) ;
+  *days = d ;
+  *seconds = u % 86400 ;
+  return 1 ;
+}