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tlshand: simplify tlsReadN()

--- a/sys/src/libsec/port/tlshand.c

+++ b/sys/src/libsec/port/tlshand.c

@@ -99,7 +99,7 @@

 	HandshakeHash	handhash;

 	Finished	finished;

-	uchar *sendp, *recvp, *recvw;

+	uchar *sendp;

 	uchar buf[1<<16];

 } TlsConnection;

@@ -691,7 +691,6 @@

 	c->trace = trace;

 	c->version = ProtocolVersion;

 	c->sendp = c->buf;

-	c->recvp = c->recvw = &c->buf[sizeof(c->buf)];

 	memset(&m, 0, sizeof(m));

 	if(!msgRecv(c, &m)){

@@ -996,7 +995,6 @@

 	c->trace = trace;

 	c->cert = nil;

 	c->sendp = c->buf;

-	c->recvp = c->recvw = &c->buf[sizeof(c->buf)];

 	c->version = ProtocolVersion;

 	tlsSecInitc(c->sec, c->version);

@@ -1264,7 +1262,7 @@

 	int n, i;

 	p = c->sendp;

-	e = c->recvp;

+	e = &c->buf[sizeof(c->buf)];

 	if(c->trace)

 		c->trace("send %s", msgPrint((char*)p, e - p, m));

@@ -1440,28 +1438,17 @@

 static uchar*

 tlsReadN(TlsConnection *c, int n)

 {

-	uchar *p, *e;

+	uchar *p, *w, *e;

-	p = c->recvp;

-	if(n <= c->recvw - p){

-		c->recvp += n;

-		return p;

-	}

 	e = &c->buf[sizeof(c->buf)];

-	c->recvp = e - n;

-	if(c->recvp < c->sendp || n > sizeof(c->buf)){

+	p = e - n;

+	if(n > sizeof(c->buf) || p < c->sendp){

 		tlsError(c, EDecodeError, "handshake message too long %d", n);

 		return nil;

 	}

-	memmove(c->recvp, p, c->recvw - p);

-	c->recvw -= p - c->recvp;

-	p = c->recvp;

-	c->recvp += n;

-	while(c->recvw < c->recvp){

-		if((n = read(c->hand, c->recvw, e - c->recvw)) <= 0)

+	for(w = p; w < e; w += n)

+		if((n = read(c->hand, w, e - w)) <= 0)

 			return nil;

-		c->recvw += n;

-	}

 	return p;

 }

@@ -1804,7 +1791,7 @@

 		goto Short;

 Ok:

 	if(c->trace)

-		c->trace("recv %s", msgPrint((char*)c->sendp, c->recvp - c->sendp, m));

+		c->trace("recv %s", msgPrint((char*)c->sendp, &c->buf[sizeof(c->buf)] - c->sendp, m));

 	return 1;

 Short:

 	tlsError(c, EDecodeError, "handshake message (%d) has invalid length", type);