F.ABUF - allocate a free buffer from the buffer pool.

Usage:

buff = f.abuf()

Where:

buff: is the address of the allocated buffer.

Description:

F.ABUF finds a free buffer in the cache of in-core buffers, initializes it, and returns it to the caller. It there are currently no free buffers it will GETVEC, and link in a new buffer. F.ABUF does not mark the buffer busy.

Notes:

This is an internal routine, not normally to be called by the user.