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vt: fix plumbsel(), snarfsel()

- plumbsel()
	- remove debug prints
	- use smalloc() to convert to bytes
	- fix spurious -1 close of plumb fd

- snarfsel()
	- fix rune buffer leak in open error case

--- a/sys/src/cmd/vt/main.c

+++ b/sys/src/cmd/vt/main.c

@@ -958,38 +958,42 @@

 	Biobuf *b;

 	Rune *r;

-	b = Bopen("/dev/snarf", OWRITE|OTRUNC);

-	if(b == nil)

+	if((r = selrunes()) == nil)

 		return;

-	r = selrunes();

-	if(!r)

+	if((b = Bopen("/dev/snarf", OWRITE|OTRUNC)) == nil){

+		free(r);

 		return;

+	}

 	Bprint(b, "%S", r);

 	Bterm(b);

 	free(r);

-

 }

 void

 plumbsel(void)

 {

-	char buf[1024], wdir[512];

+	char *s, wdir[1024];

 	Rune *r;

 	int plumb;

-	print("plumb\n");

-	if(getwd(wdir, sizeof wdir) == 0)

-		return;

 	if((r = selrunes()) == nil)

 		return;

-	print("wdir: %s, runes: %S\n", wdir, r);

-	if((plumb = plumbopen("send", OWRITE)) != -1){

-		snprint(buf, sizeof buf, "%S", r);

-		print("buf: '%s'\n", buf);

-		plumbsendtext(plumb, "vt", nil, wdir, buf);

+	if((s = smprint("%S", r)) == nil){

+		free(r);

+		return;

 	}

-	close(plumb);

 	free(r);

+	if(getwd(wdir, sizeof wdir) == nil){

+		free(s);

+		return;

+	}

+	if((plumb = plumbopen("send", OWRITE)) < 0){

+		free(s);

+		return;

+	}

+	plumbsendtext(plumb, "vt", nil, wdir, s);

+	close(plumb);

+	free(s);

 }

 void

-- 

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