Hi Bram,

2015-7-8(Wed) 2:08:03 UTC+9 Bram Moolenaar:
> Hirohito Higashi wrote:
> 
> > Hi Bram, Anatol and Vim developers!
> > 
> > 2015-7-7(Tue) 8:20:43 UTC+9 Anatol Pomozov:
> > > Is HEAD vim revision still broken? Could developers loos at this
> > > bug? Many Arch developers report this issue and we would like to
> > > release working version of vim.
> > 
> > I think that is no need to correspond to the "rgba:".
> > But, Vim is not good to output garbage being displayed which could not
> > be interpreted the "Background color response".
> > 
> > So, I wrote a patch.
> > This patch is suppress to output garbage being displayed, when unknown
> > background color response received. (e.g.
> > "11;rgba:aaaa/rrrr/gggg/bbbb")
> > 
> > Please confirm this.
> 
> It's a bit tricky.
> 
> > diff -r bfc3682510d6 src/term.c
> > --- a/src/term.c    Sat Jul 04 15:05:14 2015 +0200
> > +++ b/src/term.c    Tue Jul 07 13:08:17 2015 +0900
> > @@ -4272,7 +4272,7 @@
> >  
> >         if ((*T_CRV != NUL || *T_U7 != NUL || *T_RBG != NUL)
> >                     && ((tp[0] == ESC && tp[1] == '[' && len >= 3)
> > -                       || (tp[0] == ESC && tp[1] == ']' && len >= 24)
> > +                       || (tp[0] == ESC && tp[1] == ']' && len >= 3)
> >                         || (tp[0] == CSI && len >= 2))
> >                     && (VIM_ISDIGIT(*argp) || *argp == '>' || *argp == '?'))
> >         {
> 
> I think the length check should be len >= 5, since that's what is used
> below.

No problem. Because it checked in src/term.c:L4414.
(Note: Line number is the after applying my patch)

4413                 else if (*T_RBG != NUL
4414                         && len >= 5 - (tp[0] == CSI)
4415                         && argp[0] == '1' && argp[1] == '1' && argp[2] == 
';')
4416                 {

> 
> 
> > +                   j = 2 - (tp[0] == CSI);
> > +                   for (i = j; i < len; ++i)
> > +                       if (tp[i] == '\007'
> > +                           || (tp[0] == CSI ? tp[i] == STERM
> > +                           : i + 1 < len && tp[i] == ESC && tp[i + 1] == 
> > '\\'))
> > +                       {
> > +                           LOG_TR("Received unknown RBG");
> > +                           key_name[0] = (int)KS_EXTRA;
> > +                           key_name[1] = (int)KE_IGNORE;
> > +                           slen = i + 1 + (tp[i] == ESC);
> > +                           break;
> > +                       }
> > +
> > +                   if (i == len)
> > +                   {
> > +                       LOG_TR("not enough characters for RB");
> > +                       return -1;          /* not enough characters */
> > +                   }
> > +               }
> 
> If the terminating character is missing, or the specific terminal uses
> another character to terminate the sequence, then this will eat
> everything.

This patch discard only the following pattern. ('*' is any character string)
  ESC]11;*BEL
  ESC]11;*ESC\
  CSI11;*BEL
  CSI11;*ST

So, I think the problem is less likely to occur.

> 
> It's probably better to check for the specific code returned.  When we
> find another variant we can add it.

I dislike to accept it in each time the terminal emulator proprietary 
implementation.

Thanks.
--
Best regards,
Hirohito Higashi

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