On 2 September 2011 06:56, Bart Van Assche <[email protected]> wrote:
> The loss of precision for small values of "value" and "total" can be
> avoided by using the new formula only if these values are large.
Something like:
--- a/agent/mibgroup/ucd-snmp/disk_hw.c
+++ b/agent/mibgroup/ucd-snmp/disk_hw.c
@@ -248,7 +248,11 @@ static int _percent( unsigned long long value,
unsigned long long total ) {
/* avoid division by zero */
if (total == 0)
return 0;
- return (int)( value * 100 / total );
+ if (total < 10000 )
+ return (int)( value*100 / total );
+ else
+ /* Equivalent calculation, avoiding possible arithmetic overflow */
+ return (int)( value / (total/100) );
}
static netsnmp_fsys_info **
?
10000 is an arbitrary cut-off - it could be tweaked either way if necessary,
but seemed a reasonable starting point.
Dave
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