allocate memory for one more row ... fetch can not return 0 reows ...

git-svn-id: svn://svn.oetiker.ch/rrdtool/branches/1.2/program@683 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/src/rrd_fetch.c b/src/rrd_fetch.c
index 9bcaeb1..e6590ec 100644 (file)
--- a/src/rrd_fetch.c
+++ b/src/rrd_fetch.c
@@ -182,12 +182,12 @@ rrd_fetch_fn(
     int            first_part = 1;
     rrd_t     rrd;
     rrd_value_t    *data_ptr;
-    unsigned long  rows = (*end - *start) / *step;
+    unsigned long  rows;
 
 #ifdef DEBUG
 fprintf(stderr,"Entered rrd_fetch_fn() searching for the best match\n");
-fprintf(stderr,"Looking for: start %10lu end %10lu step %5lu rows  %lu\n",
-                                               *start,*end,*step,rows);
+fprintf(stderr,"Looking for: start %10lu end %10lu step %5lu\n",
+                                               *start,*end,*step);
 #endif
 
     if(rrd_open(filename,&in_file,&rrd, RRD_READONLY)==-1)
@@ -295,7 +295,7 @@ fprintf(stderr,"partial match, not best\n");
     *step = rrd.stat_head->pdp_step * rrd.rra_def[chosen_rra].pdp_cnt;
     *start -= (*start % *step);
     if (*end % *step) *end += (*step - *end % *step);
-    rows = (*end - *start) / *step;
+    rows = (*end - *start) / *step + 1;
 
 #ifdef DEBUG
     fprintf(stderr,"We found:    start %10lu end %10lu step %5lu rows  %lu\n",