make negative update times work as diescribed in the documentation (-5 is NOW-5seconds)

this takes care of debian bug 332766

git-svn-id: svn://svn.oetiker.ch/rrdtool/branches/1.3/program@1836 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/src/rrd_update.c b/src/rrd_update.c
index 3ee6ce5e042abdf89ce28ef71c22ec7e2cab69d0..79583507e6dc2645cb0dea76172ce52f8b0ddb2f 100644 (file)
--- a/src/rrd_update.c
+++ b/src/rrd_update.c
@@ -951,6 +951,11 @@ static int get_time_from_reading(
             return -1;
         };
         setlocale(LC_NUMERIC, old_locale);
+        if (tmp < 0.0){
+            gettimeofday(&tmp_time, 0);
+            tmp = (double)tmp_time.tv_sec + (double)tmp_time.tv_usec * 1e-6f + tmp;
+        }
+
         *current_time = floor(tmp);
         *current_time_usec = (long) ((tmp - (double) *current_time) * 1e6f);
     }