Use TDes8Overflow to handle overflow issues when calling the TDes8::AppendFormat() function.
There are many actions that the overflow function can perform but some possibilities are:
just return - in effect, this suppresses the panic caused by the overflow.
replace the entire string with some error indication, e.g. "Overflowed"
For more complex recovery actions, it may be easier to set a flag in the implementation of the TDes8Overflow class and check it on return from the call to AppendFormat() .
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