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aux/statusmsg: use libbio for textmode output

calling write(1, "\b", 1); for each rune to be removed is a lot of
overhead, and we don’t want rio to turn each of these writes into a
draw operation.

also, it now prints to stderr before exiting if initdraw() fails

--- a/sys/src/cmd/aux/statusmsg.c

+++ b/sys/src/cmd/aux/statusmsg.c

@@ -10,7 +10,8 @@

 int nokill;

 int textmode;

 char *title = nil;

-char message[1024];

+char *message = nil;

+Biobuf *bout;

 Image *light;

 Image *text;

@@ -30,8 +31,9 @@

 		static int last = 0;

 		while(last-- > 0)

-			write(1, "\b", 1);

-		write(1, message, strlen(message));

+			Bputc(bout, '\b');

+		Bwrite(bout, message, strlen(message));

+		Bflush(bout);

 		last = utflen(message);

 		return;

 	}

@@ -70,8 +72,9 @@

 	if(textmode){

 		child = -1;

 		if(title){

-			write(1, title, strlen(title));

-			write(1, ": ", 2);

+			Bwrite(bout, title, strlen(title));

+			Bwrite(bout, ": ", 2);

+			Bflush(bout);

 		}

 	} else

 	switch(child = rfork(RFMEM|RFPROC)) {

@@ -86,12 +89,14 @@

 		}

 		_exits(0);

 	}

-	while(!die && (p = Brdline(b, '\n'))) {

-		snprint(message, sizeof(message), "%.*s", Blinelen(b)-1, p);

+	while(!die && (p = Brdline(b, '\n'))){

+		snprint(message, Bsize, "%.*s", Blinelen(b)-1, p);

 		drawmsg();

 	}

-	if(textmode)

-		write(1, "\n", 1);

+	if(textmode){

+		Bwrite(bout, "\n", 1);

+		Bterm(bout);

+	}

 	postnote(PNPROC, child, "kill");

 }

@@ -140,11 +145,16 @@

 	while(q = strchr(p, ','))

 		*q = ' ';

 	Binit(&b, lfd, OREAD);

+	if((message = malloc(Bsize)) == nil)

+		sysfatal("malloc: %r");

+	memset(message, 0, Bsize);

 	if(textmode || newwin(p) < 0){

 		textmode = 1;

+		if((bout = Bfdopen(1, OWRITE)) == nil)

+			sysfatal("Bfdopen: %r");

 	}else{

 		if(initdraw(0, 0, title) < 0)

-			exits("initdraw");

+			sysfatal("initdraw: %r");

 		initcolor();

 		einit(Emouse|Ekeyboard);

 		eresized(0);