copy on write

yl::string CBaseAutopProcessor::AddAuthorizedInfo(const yl::string & strOriginalUrl,
        const yl::string & strUserName, const yl::string & strPassword)
{
    yl::string strUrl = strOriginalUrl;//cow exist error

    if (strOriginalUrl.empty()
            || strUserName.empty())
    {
        return strUrl;
    }

    char * pBuf = (char *) strUrl.c_str();
    char * pTemp = NULL;
    if ((pTemp = strstr(pBuf, "://")) != NULL)
    {
        *pTemp = '';  //cow will cause strUrl and strOriginalUrl change
        pTemp += 3;

        // 加入用户名和密码
        char bufURL[512] = {0};
        sprintf(bufURL, "%s://%s:%s@%s", pBuf, strUserName.c_str(), strPassword.c_str(), pTemp);
        strUrl = bufURL;
    }

    return strUrl;
}