Extract time functionality into lib/wallclock and lib/time

3 files changed, 59 insertions, 0 deletions

diff --git a/src/lib/wallclock/include.am b/src/lib/wallclock/include.am
index 7b735e97ee..7864c21e16 100644
--- a/src/lib/wallclock/include.am
+++ b/src/lib/wallclock/include.am
@@ -17,5 +17,6 @@ src_lib_libtor_wallclock_testing_a_CFLAGS = $(AM_CFLAGS) $(TEST_CFLAGS)
 
 noinst_HEADERS +=					\
 	src/lib/wallclock/approx_time.h			\
+	src/lib/wallclock/timeval.h			\
 	src/lib/wallclock/tm_cvt.h			\
 	src/lib/wallclock/tor_gettimeofday.h
diff --git a/src/lib/wallclock/timeval.c b/src/lib/wallclock/timeval.c
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/src/lib/wallclock/timeval.c
diff --git a/src/lib/wallclock/timeval.h b/src/lib/wallclock/timeval.h
new file mode 100644
index 0000000000..6a9b36a022
--- /dev/null
+++ b/src/lib/wallclock/timeval.h
@@ -0,0 +1,58 @@
+/* Copyright (c) 2003-2004, Roger Dingledine
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+#ifndef TOR_TIMEVAL_H
+#define TOR_TIMEVAL_H
+
+#include "orconfig.h"
+#include "lib/cc/torint.h"
+
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+#ifndef timeradd
+/** Replacement for timeradd on platforms that do not have it: sets tvout to
+ * the sum of tv1 and tv2. */
+#define timeradd(tv1,tv2,tvout) \
+  do {                                                  \
+    (tvout)->tv_sec = (tv1)->tv_sec + (tv2)->tv_sec;    \
+    (tvout)->tv_usec = (tv1)->tv_usec + (tv2)->tv_usec; \
+    if ((tvout)->tv_usec >= 1000000) {                  \
+      (tvout)->tv_usec -= 1000000;                      \
+      (tvout)->tv_sec++;                                \
+    }                                                   \
+  } while (0)
+#endif /* !defined(timeradd) */
+
+#ifndef timersub
+/** Replacement for timersub on platforms that do not have it: sets tvout to
+ * tv1 minus tv2. */
+#define timersub(tv1,tv2,tvout) \
+  do {                                                  \
+    (tvout)->tv_sec = (tv1)->tv_sec - (tv2)->tv_sec;    \
+    (tvout)->tv_usec = (tv1)->tv_usec - (tv2)->tv_usec; \
+    if ((tvout)->tv_usec < 0) {                         \
+      (tvout)->tv_usec += 1000000;                      \
+      (tvout)->tv_sec--;                                \
+    }                                                   \
+  } while (0)
+#endif /* !defined(timersub) */
+
+#ifndef timercmp
+/** Replacement for timercmp on platforms that do not have it: returns true
+ * iff the relational operator "op" makes the expression tv1 op tv2 true.
+ *
+ * Note that while this definition should work for all boolean operators, some
+ * platforms' native timercmp definitions do not support >=, <=, or ==.  So
+ * don't use those.
+ */
+#define timercmp(tv1,tv2,op)                    \
+  (((tv1)->tv_sec == (tv2)->tv_sec) ?           \
+   ((tv1)->tv_usec op (tv2)->tv_usec) :         \
+   ((tv1)->tv_sec op (tv2)->tv_sec))
+#endif /* !defined(timercmp) */
+
+#endif