1 files changed, 42 insertions, 0 deletions
diff --git a/contrib/ntp/include/timexsup.h b/contrib/ntp/include/timexsup.h
new file mode 100644
index 000000000000..81afe41e267c
--- /dev/null
+++ b/contrib/ntp/include/timexsup.h
@@ -0,0 +1,42 @@
+/*
+ * timexsup.h - 'struct timex' support functions
+ *
+ * Written by Juergen Perlinger (perlinger@ntp.org) for the NTP project.
+ * The contents of 'html/copyright.html' apply.
+ */
+#ifndef TIMEXSUP_H
+#define TIMEXSUP_H
+
+
+/* convert a 'long' time value (in usec or nsec) into seconds, expressed
+ * as a 'double'. If 'STA_NANO' is not defined, this will always convert
+ * from usec. ('STA_NANO' is Linux specific at the time of this
+ * writing.)
+ *
+ * If 'STA_NANO' is defined, it will be checked in 'status' to decide
+ * which time base (usec or nsec) applies for this conversion.
+ */
+extern double dbl_from_var_long(long lval, int status);
+
+/* convert a 'long' time value in usec into seconds, expressed as
+ * 'double'.  This function is there for pure symmetry right now -- it
+ * just casts and scales without any additional bells and whistles.
+ */ 
+extern double dbl_from_usec_long(long lval);
+
+/* If MOD_NANO is defined, set the MOD_NANO bit in '*modes' and
+ * calculate the time stamp in nsec; otherwise, calculate the result in
+ * usec.
+ *
+ * Applies proper bounds checks and saturation on LONG_MAX/LONG_MIN to
+ * avoid undefined behaviour.
+ */
+extern long var_long_from_dbl(double dval, unsigned int *modes);
+
+/* convert a 'double' time value (in seconds) into usec with proper
+ * bounds check and range clamp.
+ */
+extern long usec_long_from_dbl(double dval);
+
+#endif
+/* -*- that's all folks -*- */