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/* xsique.cc. XSI insque and remque functions.
Copyright 2007, 2008 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include <search.h>
extern "C" void
insque (void *velement, void *vpred)
{
if (!velement)
return;
struct qelem *element = (struct qelem *) velement;
struct qelem *pred = (struct qelem *) vpred;
struct qelem *succ;
if (pred)
{
if ((succ = element->q_forw = pred->q_forw))
succ->q_back = element;
pred->q_forw = element;
}
else
element->q_forw = NULL;
element->q_back = pred;
}
extern "C" void
remque (void *velement)
{
if (!velement)
return;
struct qelem *pred = ((struct qelem *) velement)->q_back;
struct qelem *succ = ((struct qelem *) velement)->q_forw;
if (succ)
succ->q_back = pred;
if (pred)
pred->q_forw = succ;
}
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