Crash when receiving large GMCP buffers

[lorienhu]

Tintin is crashing due to memory protection/buffer overflow upon receiving GMCP data larger than BUFFER_SIZE, which seems to be defined in the Tintin source as 40000.

Neither the Telnet RFC or the GMCP specification defines any maximum size for a single GMCP message, so there should probably be some handling for this.

[scandum]

One thing to be mindful of is to only call %1 once in the event, and it's an option to increase BUFFER_SIZE in tintin.h and recompile.

This is on my list of things to fix, but dynamic string handling in C is a bit of a challenge.