2 files changed, 17 insertions, 1 deletions
diff --git a/src/common/util.c b/src/common/util.c
index c2dfb5432..e79e73a0f 100644
--- a/src/common/util.c
+++ b/src/common/util.c
@@ -333,7 +333,7 @@ tor_mathlog(double d)
 }
 
 /** Return the long integer closest to d.  We define this wrapper here so
- * that not all users of math.h need to use the right incancations to get
+ * that not all users of math.h need to use the right intancations to get
  * the c99 functions. */
 long
 tor_lround(double d)
@@ -347,6 +347,21 @@ tor_lround(double d)
 #endif
 }
 
+/** Return the 64-bit integer closest to d.  We define this wrapper here so
+ * that not all users of math.h need to use the right incantations to get the
+ * c99 functions. */
+int64_t
+tor_llround(double d)
+{
+#if defined(HAVE_LLROUND)
+  return (int64_t)llround(d);
+#elif defined(HAVE_RINT)
+  return (int64_t)rint(d);
+#else
+  return (int64_t)(d > 0 ? d + 0.5 : ceil(d - 0.5));
+#endif
+}
+
 /** Returns floor(log2(u64)).  If u64 is 0, (incorrectly) returns 0. */
 int
 tor_log2(uint64_t u64)
diff --git a/src/common/util.h b/src/common/util.h
index 3388759b3..04812df7c 100644
--- a/src/common/util.h
+++ b/src/common/util.h
@@ -160,6 +160,7 @@ void tor_log_mallinfo(int severity);
 /* Math functions */
 double tor_mathlog(double d) ATTR_CONST;
 long tor_lround(double d) ATTR_CONST;
+int64_t tor_llround(double d) ATTR_CONST;
 int tor_log2(uint64_t u64) ATTR_CONST;
 uint64_t round_to_power_of_2(uint64_t u64);
 unsigned round_to_next_multiple_of(unsigned number, unsigned divisor);