code: drawterm

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aan: fix ack logic, handle connection shutdown

--- a/aan.c

+++ b/aan.c

@@ -138,8 +138,8 @@

 aanreader(void *arg)

 {

 	Client *c = (Client*)arg;

-	Buf *b, *x, **l;

-	long a, m;

+	long a, m, lastacked = 0;

+	Buf *b, *x;

 	int n;

 Restart:

@@ -150,34 +150,42 @@

 		a = GBIT32(b->hdr.acked);

 		m = GBIT32(b->hdr.msg);

 		n = GBIT32(b->hdr.nb);

-		if(n > Bufsize)

-			break;

+		if(n == 0){

+			if(m < 0)

+				continue;

+			goto Closed;

+		} else if(n < 0 || n > Bufsize)

+			goto Closed;

-		qlock(&c->lk);

-		l = &c->unackedhead;

-		for(x = c->unackedhead; x != nil; x = *l){

-			if(a >= GBIT32(x->hdr.msg)){

-				if((*l = x->next) == nil)

-					c->unackedtail = l;

-				free(x);

-			} else {

-				l = &x->next;

-			}

-		}

-		qunlock(&c->lk);

-

 		if(readn(c->netfd, b->buf, n) != n)

 			break;

 		if(m < c->inmsg)

 			continue;

 		c->inmsg++;

+

+		if(lastacked != a){

+			qlock(&c->lk);

+			while((x = c->unackedhead) != nil){

+				assert(GBIT32(x->hdr.msg) == lastacked);

+				c->unackedhead = x->next;

+				free(x);

+				if(++lastacked == a)

+					break;

+			}

+			qunlock(&c->lk);

+		}

+

 		if(c->pipefd < 0)

-			return;

+			goto Closed;

 		write(c->pipefd, b->buf, n);

 	}

 	free(b);

 	reconnect(c);

 	goto Restart;

+Closed:

+	free(b);

+	if(c->pipefd >= 0)

+		write(c->pipefd, "", 0);

 }

 int