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58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/*
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Copyright (C) 1993-1998, 2001-2021 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
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your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* This file implements the emacs_insque and emacs_remque functions,
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clones 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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#include "XMenuInt.h"
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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 (void *velem, void *vprev)
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{
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struct qelem *elem = velem;
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struct qelem *prev = vprev;
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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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void
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emacs_remque (void *velem)
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{
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struct qelem *elem = velem;
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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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