/*
*******************************************************************************
*  Copyright (c) 1996 Martin Poole                            *
*******************************************************************************
**
** WARNING !!  WARNING !! WARNING !! WARNING !! WARNING !! WARNING !!
**
** Any changes to be made to this file should first be checked with
** mplib1 source control for library integrity.
**
** mplib1 source control can be reached at  mplib1@quatermass.co.uk
** 
*
*  $Source$
*  $Author$
*  $Date$
*  $Revision$
*  Purpose        : min list handling
*
*******************************************************************************
*
* Change History
*
* $Log$
*
*******************************************************************************
*/

#ident "$Header$"

/* ------------------------------------------------------------------
    Include files
   ------------------------------------------------------------------ */

#include <mplib1/mplib1_config.h>
#include <mplib1/min_list.h>

/* ------------------------------------------------------------------
    defines
   ------------------------------------------------------------------ */

#ifndef NULL
#define NULL ((void *)0)
#endif

/* ------------------------------------------------------------------
    Code starts here
   ------------------------------------------------------------------ */

int
Init_Min_Node( Min_Node *node )
{
    INIT_MIN_NODE(node);
    return(0);
}

int
Init_Min_List( Min_List *list )
{
    list->ln_Head.ln_Pred = NULL;
    list->ln_Head.ln_Succ = &list->ln_Tail;
    list->ln_Tail.ln_Pred = &list->ln_Head;
    list->ln_Tail.ln_Succ = NULL;
    return(0);
}

int
Remove_Min_Node ( Min_Node *node )
{
    if (node->ln_Succ)
	node->ln_Succ->ln_Pred = node->ln_Pred;
    if (node->ln_Pred)
	node->ln_Pred->ln_Succ = node->ln_Succ;
    return(0);
}

int
Add_To_Min_Head ( Min_List *list, Min_Node *node )
{
    /* First remove node from previous list (if any) */
    Remove_Min_Node( node );

    /* Now set up Node in new position */
    ADD_MIN_AFTER( &list->ln_Head, node );

    return(0);
}

int
Add_To_Min_Tail ( Min_List *list, Min_Node *node )
{
    /* First remove node from previous list (if any) */
    Remove_Min_Node( node );

    /* Now set up Node in new position */
    ADD_MIN_BEFORE( &list->ln_Tail, node );

    return(0);
}

int
Add_Min_After ( Min_Node *node1, Min_Node *node2 )
{
    /* First remove node from previous list (if any) */
    Remove_Min_Node( node2 );

    /* Now set up Node in new position */
    ADD_MIN_AFTER( node1, node2 );

    return(0);
}

int
Add_Min_Before ( Min_Node *node1, Min_Node *node2 )
{
    /* First remove node from previous list (if any) */
    Remove_Min_Node( node2 );

    /* Now set up Node in new position */
    ADD_MIN_BEFORE( node1, node2 );

    return(0);
}

/* -- End of File -- */