mkdir创建多级目录

if( (iRet = access(m_UserAuthBillPath.c_str(), W_OK | R_OK | F_OK)) != 0 )
{
    char szBillPath[1024] = {0};
    char szCurDir[128] = {0};
    char* pCurr = NULL;
    char* pNext = NULL;

    memcpy(szBillPath, m_UserAuthBillPath.c_str(), 1023);
    pCurr = (szBillPath[0] == '/') ? szBillPath+1 : szBillPath;

    while ((pNext = strchr(pCurr, '/')) != NULL)
    {
        memcpy(szCurDir, szBillPath, pNext - szBillPath);

        szCurDir[pNext - szBillPath] = '\0';

        if (mkdir(szCurDir, 0777) == -1)
        {
            if (errno != EEXIST)
            {
                SPP_ERROR_LOG(m_SppBase, "mkdir %s failed. errno:%d", szCurDir, errno);
                return -2;
            }
        }
        pCurr = pNext + 1;
    }

    if (mkdir(szBillPath, 0777) == -1)
    {
        if (errno != EEXIST)
        {
            SPP_ERROR_LOG(m_SppBase, "mkdir %s failed. errno:%d", szBillPath, errno);
            return -2;
        }
    }
}