Title: bf_dupacc()


bf_dupacc(acc_ptr) creates a new accessor that is a duplicate of acc_ptr, bf_dupacc()'s only parameter.

More specifically, bf_dupacc() removes an accessor from acc_freelist and copies the accessor referred to by acc_ptr and sets acc_linkC of the new accessor to one. If acc_next is non-null, bf_dupacc() also increments acc_linkC of acc_next (the next accessor in the linked list). And if acc_buffer is non-null, bf_dupacc() also increments buf_linkC of the buffer.

This process is best described by a diagram:



Note that the link counts (acc_linkC and buf_linkC) for accessors[65] and buffers512[127] are incremented.

Remember that free accessors associated with buffers reside on buf512_freelist and free accessors not associated with buffers reside on acc_freelist. In addition, acc_linkC is one or greater if the accessor is no longer on either of the freelists and is greater than one if more than one accessor refers to it (through acc_next). buf_linkC is one or greater if its associated accessor (or accessors) are not on buf512_freelist and is greater than one if more than one accessor refers to it (through acc_buffer).