Embedded Systems Design, 2nd Edition

Buffering and other data structures 353

underrun and overrun conditions is more complex. If this is not

done then it can lead to many different problems.

If the pointers that are used to define and create buffers are

used with no range checking i.e. they are always used on the

assumption that the values are within the buffer range and are

correct, then there is always the risk that an error condition may

cause the pointers to go out of range. If a buffer underruns and the

buffer pointer now points to the next memory location outside of

the buffer and no checking is done, incorrect data will be supplied

and the pointer incremented to the next location. ...