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Store $%dot in the env(3) in a proper rc(1) list format

--- a/sam/shell.c

+++ b/sam/shell.c

@@ -13,7 +13,8 @@

 static void

 updateenv(File *f)

 {

-	char buf[64], *p;

+	int n, fd;

+	char buf[64], *p, *e;

 	if(f == nil){

 		putenv("%", "");

@@ -20,14 +21,21 @@

 		putenv("%dot", "");

 		return;

 	}

+

 	p = Strtoc(&f->name);

 	putenv("%", p);

 	free(p);

-	snprint(buf, sizeof buf, "%lud %lud %lud",

-		1+nlcount(f, 0, f->dot.r.p1),

-		f->dot.r.p1,

-		f->dot.r.p2);

-	putenv("%dot", buf);

+	

+	p = buf;

+	e = buf+sizeof(buf);

+	p = seprint(p, e, "%lud", 1+nlcount(f, 0, f->dot.r.p1));

+	p = seprint(p+1, e, "%lud", f->dot.r.p1);

+	p = seprint(p+1, e, "%lud", f->dot.r.p2);

+	n = p - buf;

+	if((fd = create("/env/%dot", OWRITE, 0666)) < 0)

+		fprint(2, "updateenv create: %r\n");

+	if(write(fd, buf, n) != n)

+		fprint(2, "updateenv write: %r\n");

 }

 int