嵌入式C语言二级指针在链表中的应用_C 语言

void FreeBlockInfo(byte *pbToFree)
{
	blockinfo *pbi, *pbiPrev;
    pbiPrev = NULL;
	for(pbi = pbiHead; pbi != NULL; pbi = pbi->pbiNext)
	{
		if(fPtrEqual(pbi->pb, pbToFree)
		{
			if(pbiPrev == NULL)
				pbiHead = pbi->pbiHead;
			else
				pbiPrev->pbiNext = pbi->pbiNext;
			break;
		}
		pbiPrev = pbi;
	}
	/*如果pbi是NULL, 说明参数pbToFree非法*/
	ASSERT(pbi != NULL);
	/*在释放前破坏掉要释放内存中的内容*/
	memset(pbi, bGarbage, sizeof(blockinfo));
	free(pbi);
}

void FreeBlockInfo(byte *pbToFree)
{
    blockinfo **ppbi, *pbiFind;
    pbiFind = NULL;
    for(ppbi = &pbiHead; *ppbi != NULL; ppbi = &(*ppbi)->pbiNext)
    {
        if(fPtrEqual((*ppbi)->pb, pbToFree)
		{
            pbiFind = *ppbi;
            *ppbi = (*ppbi)->pbiNext;
            break;
        }
    }
    /*如果pbiFind是NULL, 说明参数pbToFree非法*/
	ASSERT(pbiFind != NULL);
	/*在释放前破坏掉要释放内存中的内容*/
	memset(pbiFind, bGarbage, sizeof(blockinfo));
	free(pbiFind);
}