?? ring.c
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/* * ring_init(), ring_append(), ring_prepend(), ring_detach(), ring_succ(), * ring_pred() - circular list management utilities. * * Author: Wietse Venema. */#include "lib.h"/* ring_init - initialize ring head */void ring_init(ring)RING *ring;{ ring->pred = ring->succ = ring;}/* ring_append - insert entry after ring head */void ring_append(ring, entry)RING *ring;RING *entry;{ entry->succ = ring->succ; entry->pred = ring; ring->succ->pred = entry; ring->succ = entry;}/* ring_prepend - insert new entry before ring head */void ring_prepend(ring, entry)RING *ring;RING *entry;{ entry->pred = ring->pred; entry->succ = ring; ring->pred->succ = entry; ring->pred = entry;}/* ring_detach - remove entry from ring */void ring_detach(entry)RING *entry;{ register RING *succ = entry->succ; register RING *pred = entry->pred; pred->succ = succ; succ->pred = pred;}
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