PUSH_LINKSTACK(INFO, LINK, TOP, AVAIL, ITEM)

PUSH_LINKSTACK(INFO, LINK, TOP, AVAIL, ITEM)

This procedure pushes an ITEM into a linked stack

1.    [Avail Space?]   If AVAIL = NULL, then Write

                                     

                                    OVERFLOW AND Exit

2.   [Remove first node from AVAIL list]
             
                 Set NEW : = AVAIL and AVAIL : = LINK[AVAIL].

3.  Set INFO[NEW] : = ITEM      [Copies ITEM into new node]

4.  Set LINK[NEW] : = TOP    [New node points to the original top node in the stack]

5.  Set TOP = NEW    [reset TOP to point to the new node at the top of the stack]

6. Exit.

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