[v2,BZ,#14799] Allow to disable options in RES_OPTIONS

  On Wed, Nov 26, 2014 at 11:06:23AM +0100, Andreas Schwab wrote:
> Ondřej Bílka <neleai@seznam.cz> writes:
> 
> > +		  int invert = 0;
> > +		  if (strncmp (cp, "no-", 3))
> > +		    {
> > +		      cp += 3;
> > +		      invert = 1;
> > +		    }
> > +
> >  		  for (i = 0; i < noptions; ++i)
> >  		    if (strncmp (cp, options[i].str, options[i].len) == 0)
> >  		      {
> > -			if (options[i].clear)
> > -			  statp->options &= options[i].flag;
> > +			if (options[i].clear ^ invert)
> > +			  statp->options &= options[i].flag ^ invert;
> >  			else
> > -			  statp->options |= options[i].flag;
> > +			  statp->options |= options[i].flag ^ invert;
> 
> That doesn't work.
> 
Oops, somewhat included older patch. I meant to send this.

	[BZ #14799]
	* resolv/res_init.c (res_setoptions): Detect no- prefix to
	disable option.
  

ping.
On Thu, Nov 27, 2014 at 04:37:40PM +0100, wizard wrote:
> On Wed, Nov 26, 2014 at 11:06:23AM +0100, Andreas Schwab wrote:
> > Ondřej Bílka <neleai@seznam.cz> writes:
> > 
> > > +		  int invert = 0;
> > > +		  if (strncmp (cp, "no-", 3))
> > > +		    {
> > > +		      cp += 3;
> > > +		      invert = 1;
> > > +		    }
> > > +
> > >  		  for (i = 0; i < noptions; ++i)
> > >  		    if (strncmp (cp, options[i].str, options[i].len) == 0)
> > >  		      {
> > > -			if (options[i].clear)
> > > -			  statp->options &= options[i].flag;
> > > +			if (options[i].clear ^ invert)
> > > +			  statp->options &= options[i].flag ^ invert;
> > >  			else
> > > -			  statp->options |= options[i].flag;
> > > +			  statp->options |= options[i].flag ^ invert;
> > 
> > That doesn't work.
> > 
> Oops, somewhat included older patch. I meant to send this.
> 
> 	[BZ #14799]
> 	* resolv/res_init.c (res_setoptions): Detect no- prefix to
> 	disable option.
> 
> diff --git a/resolv/res_init.c b/resolv/res_init.c
> index ea133f8..9ea43e9 100644
> --- a/resolv/res_init.c
> +++ b/resolv/res_init.c
> @@ -533,26 +533,32 @@ res_setoptions(res_state statp, const char *options, const char *source) {
>  #define STRnLEN(str) str, sizeof (str) - 1
>  		    { STRnLEN ("inet6"), 0, RES_USE_INET6 },
>  		    { STRnLEN ("ip6-bytestring"), 0, RES_USEBSTRING },
> -		    { STRnLEN ("no-ip6-dotint"), 0, RES_NOIP6DOTINT },
>  		    { STRnLEN ("ip6-dotint"), 1, ~RES_NOIP6DOTINT },
>  		    { STRnLEN ("rotate"), 0, RES_ROTATE },
> -		    { STRnLEN ("no-check-names"), 0, RES_NOCHECKNAME },
> +		    { STRnLEN ("check-names"), 1, ~RES_NOCHECKNAME },
>  		    { STRnLEN ("edns0"), 0, RES_USE_EDNS0 },
>  		    { STRnLEN ("single-request-reopen"), 0, RES_SNGLKUPREOP },
>  		    { STRnLEN ("single-request"), 0, RES_SNGLKUP },
>  		    { STRnLEN ("no_tld_query"), 0, RES_NOTLDQUERY },
> -		    { STRnLEN ("no-tld-query"), 0, RES_NOTLDQUERY },
> +		    { STRnLEN ("tld-query"), 1, ~RES_NOTLDQUERY },
>  		    { STRnLEN ("use-vc"), 0, RES_USEVC }
>  		  };
>  #define noptions (sizeof (options) / sizeof (options[0]))
>  		  int i;
> +		  unsigned long int invert = 0;
> +		  if (strncmp (cp, "no-", 3) == 0)
> +		    {
> +		      cp += 3;
> +		      invert = ~0;
> +		    }
> +
>  		  for (i = 0; i < noptions; ++i)
>  		    if (strncmp (cp, options[i].str, options[i].len) == 0)
>  		      {
> -			if (options[i].clear)
> -			  statp->options &= options[i].flag;
> +			if (options[i].clear ^ invert)
> +			  statp->options &= options[i].flag ^ invert;
>  			else
> -			  statp->options |= options[i].flag;
> +			  statp->options |= options[i].flag ^ invert;
>  			break;
>  		      }
>  		  if (i == noptions) {
  

That doesn't work.

Andreas.