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Implement a new function ncb_add() to insert data in ncbuf. This operation is conducted in two stages. First, a simulation will be run to ensure that insertion can be proceeded. If a gap is formed, either before or after the new data, it must be big enough to store its header, or else the insertion is aborted. After this check stage, the insertion is conducted block by block with the function pair ncb_fill_data_blk()/ncb_fill_gap_blk(). A new type ncb_ret is used as a return value. For the moment, only success or gap-size error is used. It is planned to add new error types in the future when insertion will be extended.