raze-gles/polymer/eduke32/source/jaudiolib/ll_man.c

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/*
Copyright (C) 1994-1995 Apogee Software, Ltd.
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 2
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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Modifications for JonoF's port by Jonathon Fowler (jonof@edgenetwk.com)
*/
/**********************************************************************
module: LL_MAN.C
author: James R. Dose
date: January 1, 1994
Linked list management routines.
(c) Copyright 1994 James R. Dose. All Rights Reserved.
**********************************************************************/
#include <stddef.h>
#include "ll_man.h"
#define OFFSET( structure, offset ) \
( *( ( char ** )&( structure )[ offset ] ) )
/**********************************************************************
Memory locked functions:
**********************************************************************/
void LL_AddNode
(
char *item,
char **head,
char **tail,
int next,
int prev
)
{
OFFSET( item, prev ) = NULL;
OFFSET( item, next ) = *head;
if ( *head )
{
OFFSET( *head, prev ) = item;
}
else
{
*tail = item;
}
*head = item;
}
void LL_RemoveNode
(
char *item,
char **head,
char **tail,
int next,
int prev
)
{
if ( OFFSET( item, prev ) == NULL )
{
*head = OFFSET( item, next );
}
else
{
OFFSET( OFFSET( item, prev ), next ) = OFFSET( item, next );
}
if ( OFFSET( item, next ) == NULL )
{
*tail = OFFSET( item, prev );
}
else
{
OFFSET( OFFSET( item, next ), prev ) = OFFSET( item, prev );
}
OFFSET( item, next ) = NULL;
OFFSET( item, prev ) = NULL;
}