[tor-commits] [tor/maint-0.2.2] Implement replacements for timer(add, cmp, sub) on platforms lacking them.

[nickm@xxxxxxxxxxxxxx]

commit 5eaba5ac2128eebf095441e23b6b7516ce35dd5d
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date:   Wed Mar 30 14:29:57 2011 -0400

    Implement replacements for timer(add,cmp,sub) on platforms lacking them.
---
 src/common/compat.h |   42 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/src/common/compat.h b/src/common/compat.h
index 35829e1..550c08b 100644
--- a/src/common/compat.h
+++ b/src/common/compat.h
@@ -333,6 +333,48 @@ struct tm *tor_localtime_r(const time_t *timep, struct tm *result);
 struct tm *tor_gmtime_r(const time_t *timep, struct tm *result);
 #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 = (tv2)->tv_usec + (tv2)->tv_usec; \
+    if ((tvout)->tv_usec >= 1000000) {                  \
+      (tvout)->tv_usec -= 1000000;                      \
+      (tvout)->tv_sec++;                                \
+    }                                                   \
+  } while (0)
+#endif
+
+#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 = (tv2)->tv_usec - (tv2)->tv_usec; \
+    if ((tvout)->tv_usec < 0) {                         \
+      (tvout)->tv_usec += 1000000;                      \
+      (tvout)->tv_sec--;                                \
+    }                                                   \
+  } while (0)
+#endif
+
+#ifndef timercmp
+/** Replacement for timersub 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 opeators, 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
+
 /* ===== File compatibility */
 int replace_file(const char *from, const char *to);
 int touch_file(const char *fname);



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