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/* insque(3C) routines This file is in the public domain. */ /* NAME insque, remque -- insert, remove an element from a queue SYNOPSIS struct qelem { struct qelem *q_forw; struct qelem *q_back; char q_data[]; }; void insque (struct qelem *elem, struct qelem *pred) void remque (struct qelem *elem) DESCRIPTION Routines to manipulate queues built from doubly linked lists. The insque routine inserts ELEM in the queue immediately after PRED. The remque routine removes ELEM from its containing queue. */ struct qelem { struct qelem *q_forw; struct qelem *q_back; }; void insque (elem, pred) struct qelem *elem; struct qelem *pred; { elem -> q_forw = pred -> q_forw; pred -> q_forw -> q_back = elem; elem -> q_back = pred; pred -> q_forw = elem; } void remque (elem) struct qelem *elem; { elem -> q_forw -> q_back = elem -> q_back; elem -> q_back -> q_forw = elem -> q_forw; }
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