vgamga4xx: updates from Philippe Anel
devcons: fix doubled character when typing
devsd: used and not set bug
 [rsc] --rw-rw-r-- M 22963 glenda sys 9489 Mar 29 11:02 sys/src/9/pc/vgamga4xx.c
	[diffs elided - too long]
	[diff -c /n/sourcesdump/2006/0329/plan9/sys/src/9/pc/vgamga4xx.c /n/sourcesdump/2006/0330/plan9/sys/src/9/pc/vgamga4xx.c]
 [rsc] --rw-rw-r-- M 22963 glenda sys 23071 Mar 29 11:01 sys/src/9/port/devcons.c
	/n/sourcesdump/2006/0329/plan9/sys/src/9/port/devcons.c:393,399 - 
	/n/sourcesdump/2006/0330/plan9/sys/src/9/port/devcons.c:393,399
	  		qiwrite(serialoq, ebuf, p - ebuf);
	  }
	  
	- void
	+ static void
	  echo(char *buf, int n)
	  {
	  	static int ctrlt, pid;
	/n/sourcesdump/2006/0329/plan9/sys/src/9/port/devcons.c:400,405 - 
	/n/sourcesdump/2006/0330/plan9/sys/src/9/port/devcons.c:400,408
	  	int x;
	  	char *e, *p;
	  
	+ 	if(n == 0)
	+ 		return;
	+ 
	  	e = buf+n;
	  	for(p = buf; p < e; p++){
	  		switch(*p){
	/n/sourcesdump/2006/0329/plan9/sys/src/9/port/devcons.c:548,555 - 
	/n/sourcesdump/2006/0330/plan9/sys/src/9/port/devcons.c:551,560
	  			echo(kbd.ir, kbd.ie-kbd.ir);
	  			kbd.ir = kbd.istage;
	  		}
	- 		echo(kbd.ir, iw-kbd.ir);
	- 		kbd.ir = iw;
	+ 		if(kbd.ir != iw){
	+ 			echo(kbd.ir, iw-kbd.ir);
	+ 			kbd.ir = iw;
	+ 		}
	  	}
	  }
	  
	/n/sourcesdump/2006/0329/plan9/sys/src/9/port/devcons.c:745,751 - 
	/n/sourcesdump/2006/0330/plan9/sys/src/9/port/devcons.c:750,757
	  			nexterror();
	  		}
	  		while(!qcanread(lineq)){
	- 			qread(kbdq, &ch, 1);
	+ 			if(qread(kbdq, &ch, 1) == 0)
	+ 				continue;
	  			send = 0;
	  			if(ch == 0){
	  				/* flush output on rawoff -> rawon */
 [rsc] --rw-rw-r-- M 22963 glenda sys 30871 Mar 29 11:02 sys/src/9/port/devsd.c
	/n/sourcesdump/2006/0329/plan9/sys/src/9/port/devsd.c:506,512 - 
	/n/sourcesdump/2006/0330/plan9/sys/src/9/port/devsd.c:506,512
	  		}
	  		
	  		if((sdev = sdgetdev(DEV(c->qid))) == nil){
	- 			devdir(c, q, "unavailable", 0, eve, 0, dp);
	+ 			devdir(c, c->qid, "unavailable", 0, eve, 0, dp);
	  			return 1;
	  		}