Function cups_auth_scheme

cups/auth.c:724–784

 */

static const char *				/* O - Start of scheme or @code NULL@ if not found */
cups_auth_scheme(const char *www_authenticate,	/* I - Pointer into WWW-Authenticate header */
		 char       *scheme,		/* I - Scheme name buffer */
		 size_t     schemesize)		/* I - Size of buffer */
{
  const char	*start;				/* Start of scheme data */
  char		*sptr = scheme,			/* Pointer into scheme buffer */
		*send = scheme + schemesize - 1;/* End of scheme buffer */
  int		param;				/* Is this a parameter? */


  DEBUG_printf(("8cups_auth_scheme(www_authenticate=\"%s\", scheme=%p, schemesize=%u)", www_authenticate, (void *)scheme, (unsigned)schemesize));

  while (*www_authenticate)
  {
   /*
    * Skip leading whitespace and commas...
    */

    while (isspace(*www_authenticate & 255) || *www_authenticate == ',')
      www_authenticate ++;

   /*
    * Parse the scheme name or param="value" string...
    */

    for (sptr = scheme, start = www_authenticate, param = 0; *www_authenticate && *www_authenticate != ',' && !isspace(*www_authenticate & 255); www_authenticate ++)
    {
      if (*www_authenticate == '=')
        param = 1;
      else if (!param && sptr < send)
        *sptr++ = *www_authenticate;
      else if (*www_authenticate == '\"')
      {
       /*
        * Skip quoted value...
        */


        do
          www_authenticate ++;
        while (*www_authenticate && *www_authenticate != '\"');
      }
    }

    if (sptr > scheme && !param)
    {
      *sptr = '\0';

      DEBUG_printf(("9cups_auth_scheme: Returning \"%s\".", start));

      return (start);
    }
  }

  *scheme = '\0';

  DEBUG_puts("9cups_auth_scheme: Returning NULL.");