74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/* insque(3C) routines
|
|
Copyright (C) 1991 Free Software Foundation, Inc.
|
|
|
|
This file is part of the libiberty library.
|
|
Libiberty 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.
|
|
|
|
Libiberty 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 libiberty; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
/*
|
|
|
|
NAME
|
|
|
|
insque, remque -- insert, remove an element from a queue
|
|
|
|
SYNOPSIS
|
|
|
|
struct qelem {
|
|
struct qelem *q_forw;
|
|
struct qelem *q_back;
|
|
char q_data[];
|
|
};
|
|
|
|
void insque (struct qelem *elem, struct qelem *pred)
|
|
|
|
void remque (struct qelem *elem)
|
|
|
|
DESCRIPTION
|
|
|
|
Routines to manipulate queues built from doubly linked lists.
|
|
The insque routine inserts ELEM in the queue immediately after
|
|
PRED. The remque routine removes ELEM from its containing queue.
|
|
|
|
BUGS
|
|
|
|
*/
|
|
|
|
|
|
struct qelem {
|
|
struct qelem *q_forw;
|
|
struct qelem *q_back;
|
|
};
|
|
|
|
|
|
void
|
|
insque (elem, pred)
|
|
struct qelem *elem;
|
|
struct qelem *pred;
|
|
{
|
|
elem -> q_forw = pred -> q_forw;
|
|
pred -> q_forw -> q_back = elem;
|
|
elem -> q_back = pred;
|
|
pred -> q_forw = elem;
|
|
}
|
|
|
|
|
|
void
|
|
remque (elem)
|
|
struct qelem *elem;
|
|
{
|
|
elem -> q_forw -> q_back = elem -> q_back;
|
|
elem -> q_back -> q_forw = elem -> q_forw;
|
|
}
|