From 07cba2253ec1f863bba53c2d3829d97e649238e7 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Fri, 24 Dec 1999 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1999-12-24

---
 ip/tcp.c    |  2 +-
 port/auth.c |  2 +-
 port/chan.c | 55 +++++++++++++++++++++++++++++++----------------------
 3 files changed, 34 insertions(+), 25 deletions(-)

diff --git a/ip/tcp.c b/ip/tcp.c
index 7dd920aae5eff420750f4ca1c26280983618fd73..09c6a9ba244ba6e96b829c38b1b262446b6233cd 100644
--- a/ip/tcp.c
+++ b/ip/tcp.c
@@ -2012,7 +2012,7 @@ addreseq(Tcpctl *tcb, Tcp *seg, Block *bp, ushort length)
 	if(i > 100 && once++ == 0){
 		print("very long tcp resequence queue: %d\n", length);
 		for(rp1 = tcb->reseq, i = 0; i < 10 && rp1 != nil; rp1 = rp1->next, i++)
-			print("0x%lux 0x%lux 0x%ux", rp1->seg.seq, rp1->seg.ack,
+			print("0x%lux 0x%lux 0x%ux\n", rp1->seg.seq, rp1->seg.ack,
 				rp1->seg.flags);
 		return -1;
 	}
diff --git a/port/auth.c b/port/auth.c
index 4e52fe659b29d3cdf711732c4a3db92c9514c233..3cd0edf22497a85639b5bf6a1e9465a020683bc0 100644
--- a/port/auth.c
+++ b/port/auth.c
@@ -537,7 +537,7 @@ authentwrite(Chan *c, char *a, int n)
 
 /*
  *  create an authenticator and return it and optionally the
- *  unencripted ticket
+ *  unencrypted ticket
  */
 long
 authentread(Chan *c, char *a, int n)
diff --git a/port/chan.c b/port/chan.c
index 398bd2e8260f87f4bff3f28139128f0205f02f1f..959b73df6d3022387f7f5c60a33b756238c88e14 100644
--- a/port/chan.c
+++ b/port/chan.c
@@ -156,7 +156,8 @@ addelem(Cname *n, char *s)
 		n->s = t;
 		n->alen = a;
 	}
-	n->s[n->len++] = '/';
+	if(n->len>0 && n->s[n->len-1]!='/' && s[0]!='/')	/* don't insert extra slash if one is present */
+		n->s[n->len++] = '/';
 	memmove(n->s+n->len, s, i+1);
 	n->len += i;
 	return n;
@@ -473,6 +474,21 @@ undomount(Chan *c)
 	return c;
 }
 
+Chan *
+updatecname(Chan *c, char *name, int dotdot)
+{
+	if(c->name == nil)
+		c->name = newcname(name);
+	else
+		c->name = addelem(c->name, name);
+	
+	if(dotdot){
+		cleancname(c->name, c->name->s[0]=='#');	/* could be cheaper */
+		c = undomount(c);
+	}
+	return c;
+}
+
 int
 walk(Chan **cp, char *name, int domnt)
 {
@@ -494,16 +510,7 @@ walk(Chan **cp, char *name, int domnt)
 	ac->flag &= ~CCREATE;	/* not inherited through a walk */
 	if(devtab[ac->type]->walk(ac, name) != 0) {
 		/* walk succeeded: update name associated with *cp (ac) */
-		c = *cp;
-		if(c->name == nil)
-			c->name = newcname(name);
-		else
-			c->name = addelem(c->name, name);
-		
-		if(dotdot){
-			cleancname(c->name, c->name->s[0]=='#');	/* could be cheaper */
-			*cp = undomount(c);
-		}
+		*cp = updatecname(*cp, name, dotdot);
 		if(domnt)
 			*cp = domount(*cp);
 		return 0;
@@ -535,23 +542,22 @@ walk(Chan **cp, char *name, int domnt)
 	if(c == nil)
 		return -1;
 
-	if(dotdot)
-		c = undomount(c);
-
 	if(c->mh){
 		putmhead(c->mh);
 		c->mh = nil;
 	}
-	if(domnt) {
-		if(waserror()) {
-			cclose(c);
-			nexterror();
-		}
-		c = domount(c);
-		poperror();
-	}
+
+	/* replace c->name by ac->name */
+	cnameclose(c->name);
+	c->name = ac->name;
+	if(ac->name)
+		incref(ac->name);
+	c = updatecname(c, name, dotdot);
 	cclose(ac);
 	*cp = c;
+
+	if(domnt)
+		*cp = domount(c);
 	return 0;
 }
 
@@ -733,8 +739,11 @@ namec(char *name, int amode, int omode, ulong perm)
 		mntok = 0;
 		elem[0] = 0;
 		n = 0;
-		while(*name && (*name != '/' || n < 2))
+		while(*name && (*name != '/' || n < 2)){
+			if(n >= NAMELEN-1)
+				error(Efilename);
 			elem[n++] = *name++;
+		}
 		elem[n] = '\0';
 		n = chartorune(&r, elem+1)+1;
 		if(r == 'M') {