I'm the author of the "Hobbit" monitoring tool, which uses RRDtool.
While testing with the new RRDtool 1.2.1, I noticed that the
rrd_create() routine modifies all "RRA:..." parameters passed to it.
This is a change in behaviour from RRDtool 1.0.x which leaves these
parameters unchanged.
I believe this is a bug, since rrd_create() should not assume that these
strings are at all writable. 

Digging into the sources, it seems this is due to the use of strtok_r()
directly on the parameters passed as input to rrd_create(). A patch to
restore the behaviour from RRDtool 1.0.x is included below; this avoids 
modifying the input parameter by using a copy of the parameter for the 
strtok_r() operations. It also fixes a simple bug where strncmp()
compares only the first 3 characters of the string "RRA:" with the input
parameter.


Regards,
Henrik



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