mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-15 09:47:20 +00:00
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/*
|
|
Copyright (C) 1993-1998, 2001-2021 Free Software Foundation, Inc.
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or (at
|
|
your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
/* This file implements the emacs_insque and emacs_remque functions,
|
|
clones 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. */
|
|
|
|
#include "XMenuInt.h"
|
|
|
|
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 (void *velem, void *vprev)
|
|
{
|
|
struct qelem *elem = velem;
|
|
struct qelem *prev = vprev;
|
|
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. */
|
|
|
|
void
|
|
emacs_remque (void *velem)
|
|
{
|
|
struct qelem *elem = velem;
|
|
struct qelem *next = elem->q_forw;
|
|
struct qelem *prev = elem->q_back;
|
|
if (next)
|
|
next->q_back = prev;
|
|
if (prev)
|
|
prev->q_forw = next;
|
|
}
|