[or-cvs] [tor/master] Simplify the math to round up to the next multiple of some value.

[Nick Mathewson]

Author: Karsten Loesing <karsten.loesing at gmx.net>
Date: Sat, 11 Jul 2009 00:44:27 +0200
Subject: Simplify the math to round up to the next multiple of some value.
Commit: d1437245c77b930382f9b36355a3fa67d48ecb38

---
 src/or/geoip.c   |   10 ----------
 src/or/or.h      |   10 ++++++++++
 src/or/rephist.c |   22 ++++++++--------------
 3 files changed, 18 insertions(+), 24 deletions(-)

diff --git a/src/or/geoip.c b/src/or/geoip.c
index 13a6a28..aac4893 100644
--- a/src/or/geoip.c
+++ b/src/or/geoip.c
@@ -461,16 +461,6 @@ _c_hist_compare(const void **_a, const void **_b)
  * are willing to talk about it? */
 #define GEOIP_MIN_OBSERVATION_TIME (12*60*60)
 
-/** Return the lowest x such that x is at least <b>number</b>, and x modulo
- * <b>divisor</b> == 0. */
-static INLINE unsigned
-round_to_next_multiple_of(unsigned number, unsigned divisor)
-{
-  number += divisor - 1;
-  number -= number % divisor;
-  return number;
-}
-
 /** Return a newly allocated comma-separated string containing entries for all
  * the countries from which we've seen enough clients connect. The entry
  * format is cc=num where num is the number of IPs we've seen connecting from
diff --git a/src/or/or.h b/src/or/or.h
index f298d53..be38035 100644
--- a/src/or/or.h
+++ b/src/or/or.h
@@ -2669,6 +2669,16 @@ struct socks_request_t {
                               * every connection. */
 };
 
+/** Return the lowest x such that x is at least <b>number</b>, and x modulo
+ * <b>divisor</b> == 0. */
+static INLINE unsigned
+round_to_next_multiple_of(unsigned number, unsigned divisor)
+{
+  number += divisor - 1;
+  number -= number % divisor;
+  return number;
+}
+
 /* all the function prototypes go here */
 
 /********************************* buffers.c ***************************/
diff --git a/src/or/rephist.c b/src/or/rephist.c
index ba363ba..73dd131 100644
--- a/src/or/rephist.c
+++ b/src/or/rephist.c
@@ -1404,10 +1404,8 @@ write_exit_stats(time_t when)
           if (exit_bytes_read[i] + exit_bytes_written[i] > 0 &&
               (total_bytes / (exit_bytes_read[i] + exit_bytes_written[i])
               < EXIT_STATS_THRESHOLD)) {
-            uint64_t num = b[i];
-            num += EXIT_STATS_ROUND_UP_BYTES - 1;
-            num /= EXIT_STATS_ROUND_UP_BYTES;
-            num *= EXIT_STATS_ROUND_UP_BYTES;
+            uint64_t num = round_to_next_multiple_of(b[i],
+                                         EXIT_STATS_ROUND_UP_BYTES);
             num /= 1024;
             if (fprintf(out, "%s%d="U64_FORMAT,
                         comma++ ? "," : "", i,
@@ -1417,9 +1415,8 @@ write_exit_stats(time_t when)
             other_bytes += b[i];
         }
       }
-      other_bytes += EXIT_STATS_ROUND_UP_BYTES - 1;
-      other_bytes /= EXIT_STATS_ROUND_UP_BYTES;
-      other_bytes *= EXIT_STATS_ROUND_UP_BYTES;
+      other_bytes = round_to_next_multiple_of(other_bytes,
+                                  EXIT_STATS_ROUND_UP_BYTES);
       other_bytes /= 1024;
       if (fprintf(out, "%sother="U64_FORMAT"\n",
                   comma ? "," : "", other_bytes)<0)
@@ -1435,10 +1432,8 @@ write_exit_stats(time_t when)
         if (exit_bytes_read[i] + exit_bytes_written[i] > 0 &&
              (total_bytes / (exit_bytes_read[i] + exit_bytes_written[i])
              < EXIT_STATS_THRESHOLD)) {
-          uint32_t num = exit_streams[i];
-          num += EXIT_STATS_ROUND_UP_STREAMS - 1;
-          num /= EXIT_STATS_ROUND_UP_STREAMS;
-          num *= EXIT_STATS_ROUND_UP_STREAMS;
+          uint32_t num = round_to_next_multiple_of(exit_streams[i],
+                                       EXIT_STATS_ROUND_UP_STREAMS);
           if (fprintf(out, "%s%d=%d",
                       comma++ ? "," : "", i, num)<0)
             goto done;
@@ -1446,9 +1441,8 @@ write_exit_stats(time_t when)
           other_streams += exit_streams[i];
       }
     }
-    other_streams += EXIT_STATS_ROUND_UP_STREAMS - 1;
-    other_streams /= EXIT_STATS_ROUND_UP_STREAMS;
-    other_streams *= EXIT_STATS_ROUND_UP_STREAMS;
+    other_streams = round_to_next_multiple_of(other_streams,
+                                  EXIT_STATS_ROUND_UP_STREAMS);
     if (fprintf(out, "%sother=%d\n",
                 comma ? "," : "", other_streams)<0)
       goto done;
-- 
1.5.6.5