From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <c4a46c570611101635p77123101wdfa0026b8c092b87@mail.gmail.com>
Date: Sat, 11 Nov 2006 00:35:06 +0000
From: "Arvindh Rajesh Tamilmani" <arvindht@gmail.com>
To: "Fans of the OS Plan 9 from Bell Labs" <9fans@cse.psu.edu>
Subject: Re: Re: [9fans] winclear in p9p
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> > Here is a simpler one:
> >
> >         echo -n , >/mnt/acme/$winid/addr
> >         echo -n >/mnt/acme/$winid/data
> >
>
> Maybe it's how I keyed it in, or that I've got the worst cold I've had
> in about 6 or 7 years, but I'm getting invalid address with this
> version.  It looks cleaner but for some reason it's just not liking
> me.

Were you trying it on win(1)?
I think the original winclear was built for that.

The two-liner clears win, but then win stops responding to commands.

The following patch to win/main.c seems to make the two-liner work.

Arvindh

/acme/bin/source/win/main.c:237,243 - main.c:237,242
  	sprint(buf, "#%lud,#%lud", q0, q0+n);
  	winsetaddr(w, buf, 0);
  	write(w->data, buf, 0);
- 	*q1 -= n;
  	return 0;
  }

/acme/bin/source/win/main.c:457,463 - main.c:456,466
  		case 'F':	/* generated by our actions (specifically case 'S' above) */
  			delta = e->q1-e->q0;
  			if(e->c2=='D'){
- 				/* we know about the delete by _sendinput */
+ 				endpt -= delta;
+ 				if(e->q1 < hostpt)
+ 					hostpt -= delta;
+ 				else if(e->q0 < hostpt)
+ 					hostpt = e->q0;
  				break;
  			}
  			if(e->c2=='I'){