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