[Orca-dev] Little patch

[Yann Rouillard]

This tiny little patch solve a problem I had.
Orca try to test if a data expression is ok by compiling dynamically a 
sub function.
This usually works... except when the data expression begin with a # 
like #httpds.
In this case it passes the test and we end up with an error message from 
rrdtool which can't convert hostname_gauge_...#httpds to float. So the 
rrd file is not updated and as a result all data files are loaded each 
time to try to update gauge_#httpds rrd file.

This little patch solves the problem by not allowing non-substituted 
expression to begin with #.
However I wonder if wouldn't be easier to just only allow 
non-substituted expression to be numbers or arithmetic operator...

Yann
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