1 files changed, 20 insertions, 0 deletions
diff --git a/src/libstddjb/time_sysclock_from_tai.c b/src/libstddjb/time_sysclock_from_tai.c
new file mode 100644
index 0000000..c16dbe2
--- /dev/null
+++ b/src/libstddjb/time_sysclock_from_tai.c
@@ -0,0 +1,20 @@
+/* ISC license. */
+
+#include <sys/types.h>
+#include <errno.h>
+#include <skalibs/sysdeps.h>
+#include <skalibs/uint64.h>
+#include <skalibs/tai.h>
+
+int time_sysclock_from_tai (time_t *u, tai_t const *t)
+{
+  uint64 uu ;
+  if (!sysclock_from_tai(&uu, t)) return 0 ;
+  uu -= TAI_MAGIC ;
+#if SKALIBS_SIZEOFTIME < 8
+  if ((uu >> 32) && (uu >> 32) != 0xffffffffUL)
+    return (errno = EOVERFLOW, 0) ;
+#endif
+  *u = (time_t)uu ;
+  return 1 ;
+}