50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/* Copyright (C) 1992, 1995 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#include <ansidecl.h>
|
|
#include <stddef.h>
|
|
#include <search.h>
|
|
|
|
/* Insert ELEM into a doubly-linked list, after PREV. */
|
|
|
|
void
|
|
DEFUN(insque, (elem, prev) ,
|
|
struct qelem *elem AND struct qelem *prev)
|
|
{
|
|
struct qelem *next = prev->q_forw;
|
|
prev->q_forw = elem;
|
|
if (next != NULL)
|
|
next->q_back = elem;
|
|
elem->q_forw = next;
|
|
elem->q_back = prev;
|
|
}
|
|
|
|
/* Unlink ELEM from the doubly-linked list that it is in. */
|
|
|
|
void
|
|
DEFUN(remque, (elem),
|
|
struct qelem *elem)
|
|
{
|
|
struct qelem *next = elem->q_forw;
|
|
struct qelem *prev = elem->q_back;
|
|
if (next != NULL)
|
|
next->q_back = prev;
|
|
if (prev != NULL)
|
|
prev->q_forw = next;
|
|
}
|