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39 lines
886 B
C
39 lines
886 B
C
/* This file implements the emacs_insque and emacs_remque functions,
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copies of the insque and remque functions of BSD. They and all
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their callers have been renamed to emacs_mumble to allow us to
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include this file in the menu library on all systems. */
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struct qelem {
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struct qelem *q_forw;
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struct qelem *q_back;
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char q_data[1];
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};
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/* Insert ELEM into a doubly-linked list, after PREV. */
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void
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emacs_insque (elem, prev)
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struct qelem *elem, *prev;
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{
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struct qelem *next = prev->q_forw;
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prev->q_forw = elem;
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if (next)
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next->q_back = elem;
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elem->q_forw = next;
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elem->q_back = prev;
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}
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/* Unlink ELEM from the doubly-linked list that it is in. */
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emacs_remque (elem)
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struct qelem *elem;
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{
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struct qelem *next = elem->q_forw;
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struct qelem *prev = elem->q_back;
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if (next)
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next->q_back = prev;
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if (prev)
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prev->q_forw = next;
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}
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