rrlli.c

开放源码的编译器open watcom 1.6.0版的源代码

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
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****************************************************************************/


/*
 * MEM2.C - memory allocation/usage routines
 *
 * By:  Craig Eisler
 *      June 4-5,11-12,17 1990
 *      July 16,31 1990
 *      August 1 1990
 *      September 11 1990
 *      October 31 1990
 *      November 4,7,19,22 1990
 *      December 28 1990
 *      January 1 1991
 *      March 30 1991
 *
 * Routines:
 *              ResAddLLItemAtEnd
 *              ResInsertLLItemAfter
 *              ResInsertLLItemBefore
 *              ResDeleteLLItem
 *              ResReplaceLLItem
 */

#include <stdlib.h>
#include "mem2.h"

typedef struct ss {
struct ss *next,*prev;
} ss;


/*
 * ResReplaceLLItem - drop a replacement item into a linked list
 */
void ResReplaceLLItem( void **headptr, void **tailptr,
                        void *itemptr, void *newptr )
{
    ss          **head;
    ss          **tail;
    ss          *item;
    ss          *new;

    head = (ss **)headptr;
    tail = (ss **)tailptr;
    item = (ss *)itemptr;
    new  = (ss *)newptr;

    if( item == *head ) *head = new;
    if( item == *tail ) *tail = new;

    new->prev = item->prev;
    new->next = item->next;

    if( item->prev != NULL ) item->prev->next = new;
    if( item->next != NULL ) item->next->prev = new;

} /* ResReplaceLLItem */