int osip_www_authenticate_to_str 和osip_message_set_www_authenticate

2.分析：函数首先将认证信息添加到数据报文中，然后将认证信息添加到osip_list链表，这将会大大方便函数的释放。

源代码1：

int

osip_www_authenticate_to_str (const osip_www_authenticate_t * wwwa, char **dest)
{
  size_t len;
  char *tmp;

*dest = NULL;
  if ((wwwa == NULL) || (wwwa->auth_type == NULL))
    return OSIP_BADPARAMETER;

len = strlen (wwwa->auth_type) + 1;

if (wwwa->realm != NULL)
    len = len + strlen (wwwa->realm) + 7;
  if (wwwa->nonce != NULL)
    len = len + strlen (wwwa->nonce) + 8;
  len = len + 2;
  if (wwwa->domain != NULL)
    len = len + strlen (wwwa->domain) + 9;
  if (wwwa->opaque != NULL)
    len = len + strlen (wwwa->opaque) + 9;
  if (wwwa->stale != NULL)
    len = len + strlen (wwwa->stale) + 8;
  if (wwwa->algorithm != NULL)
    len = len + strlen (wwwa->algorithm) + 12;
  if (wwwa->qop_options != NULL)
    len = len + strlen (wwwa->qop_options) + 6;

tmp = (char *) osip_malloc (len);
  if (tmp == NULL)
    return OSIP_NOMEM;
  *dest = tmp;

tmp = osip_str_append (tmp, wwwa->auth_type);

if (wwwa->realm != NULL)
    {
      tmp = osip_strn_append (tmp, " realm=", 7);
      tmp = osip_str_append (tmp, wwwa->realm);
    }
  if (wwwa->domain != NULL)
    {
      tmp = osip_strn_append (tmp, ", domain=", 9);
      tmp = osip_str_append (tmp, wwwa->domain);
    }
  if (wwwa->nonce != NULL)
    {
      tmp = osip_strn_append (tmp, ", nonce=", 8);
      tmp = osip_str_append (tmp, wwwa->nonce);
    }
  if (wwwa->opaque != NULL)
    {
      tmp = osip_strn_append (tmp, ", opaque=", 9);
      tmp = osip_str_append (tmp, wwwa->opaque);
    }
  if (wwwa->stale != NULL)
    {
      tmp = osip_strn_append (tmp, ", stale=", 8);
      tmp = osip_str_append (tmp, wwwa->stale);
    }
  if (wwwa->algorithm != NULL)
    {
      tmp = osip_strn_append (tmp, ", algorithm=", 12);
      tmp = osip_str_append (tmp, wwwa->algorithm);
    }
  if (wwwa->qop_options != NULL)
    {
      tmp = osip_strn_append (tmp, ", qop=", 6);
      tmp = osip_str_append (tmp, wwwa->qop_options);
    }

if (wwwa->realm == NULL)
    {
      /* remove comma */
      len = strlen (wwwa->auth_type);
      if ((*dest)[len] == ‘,‘)
        (*dest)[len] = ‘ ‘;
    }

return OSIP_SUCCESS;

}

源代码2：

int
osip_message_set_www_authenticate (osip_message_t * sip, const char *hvalue)
{
  osip_www_authenticate_t *www_authenticate;
  int i;

if (hvalue == NULL || hvalue[0] == ‘\0‘)
    return OSIP_SUCCESS;

if (sip == NULL)
    return OSIP_BADPARAMETER;
  i = osip_www_authenticate_init (&www_authenticate);
  if (i != 0)
    return i;
  i = osip_www_authenticate_parse (www_authenticate, hvalue);
  if (i != 0)
    {
      osip_www_authenticate_free (www_authenticate);
      return i;
    }
  sip->message_property = 2;
  osip_list_add (&sip->www_authenticates, www_authenticate, -1);
  return OSIP_SUCCESS;
}