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