From 824a622ece8edc2759a47f57b4430c7eb0ff98c3 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Mon, 17 Oct 1994 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1994-10-17

---
 pc/devfloppy.c    | 30 ++++++++++++------
 port/devns16552.c | 81 ++++++++++++++++++++++++++++-------------------
 2 files changed, 69 insertions(+), 42 deletions(-)

diff --git a/pc/devfloppy.c b/pc/devfloppy.c
index 2ecd129f0ac67b66b2c5f1618b673636bfa53d6f..6a0fb5a9ac34ce59fd105404c26be2d787fd9d4f 100644
--- a/pc/devfloppy.c
+++ b/pc/devfloppy.c
@@ -206,14 +206,14 @@ static int	cmddone(void*);
 void Xdelay(int);
 
 Dirtab floppydir[]={
-	"fd0disk",		{Qdata + 0},	0,	0666,
-	"fd0ctl",		{Qctl + 0},	0,	0666,
-	"fd1disk",		{Qdata + 1},	0,	0666,
-	"fd1ctl",		{Qctl + 1},	0,	0666,
-	"fd2disk",		{Qdata + 2},	0,	0666,
-	"fd2ctl",		{Qctl + 2},	0,	0666,
-	"fd3disk",		{Qdata + 3},	0,	0666,
-	"fd3ctl",		{Qctl + 3},	0,	0666,
+	"fd0disk",		{Qdata + 0},	0,	0660,
+	"fd0ctl",		{Qctl + 0},	0,	0660,
+	"fd1disk",		{Qdata + 1},	0,	0660,
+	"fd1ctl",		{Qctl + 1},	0,	0660,
+	"fd2disk",		{Qdata + 2},	0,	0660,
+	"fd2ctl",		{Qctl + 2},	0,	0660,
+	"fd3disk",		{Qdata + 3},	0,	0660,
+	"fd3ctl",		{Qctl + 3},	0,	0660,
 };
 #define NFDIR	2	/* directory entries/drive */
 
@@ -374,8 +374,18 @@ floppyremove(Chan *c)
 void
 floppywstat(Chan *c, char *dp)
 {
-	USED(c, dp);
-	error(Eperm);
+	Dirtab *dt;
+	Dir d;
+
+	if(!iseve())
+		error(Eperm);
+	if(CHDIR & c->qid.path)
+		error(Eperm);
+
+	convM2D(dp, &d);
+	d.mode &= 0x666;
+	dt = &floppydir[2 * (c->qid.path & ~Qmask)];
+	dt[0].perm = dt[1].perm = d.mode;
 }
 
 static void
diff --git a/port/devns16552.c b/port/devns16552.c
index b80fbdde42a1844c58c5792d1e23310ca48650c1..826734d38aec6587643e4e40f82ed2f1067a434d 100644
--- a/port/devns16552.c
+++ b/port/devns16552.c
@@ -624,6 +624,24 @@ uartclock(void)
 }
 
 Dirtab *ns16552dir;
+int ndir;
+
+static void
+setlength(int i)
+{
+	Uart *p;
+
+	if(i > 0){
+		p = uart[i];
+		if(p && p->opens && p->iq)
+			ns16552dir[3*i].length = qlen(p->iq);
+	} else for(i = 0; i < nuart; i++){
+		p = uart[i];
+		if(p && p->opens && p->iq)
+			ns16552dir[3*i].length = qlen(p->iq);
+	}
+		
+}
 
 /*
  *  all uarts must be ns16552setup() by this point or inside of ns16552install()
@@ -636,17 +654,18 @@ ns16552reset(void)
 
 	ns16552install();	/* architecture specific */
 
-	ns16552dir = xalloc(3 * nuart * sizeof(Dirtab));
+	ndir = 3*nuart;
+	ns16552dir = xalloc(ndir * sizeof(Dirtab));
 	dp = ns16552dir;
 	for(i = 0; i < nuart; i++){
 		/* 3 directory entries per port */
 		sprint(dp->name, "eia%d", i);
 		dp->qid.path = NETQID(i, Ndataqid);
-		dp->perm = 0666;
+		dp->perm = 0660;
 		dp++;
 		sprint(dp->name, "eia%dctl", i);
 		dp->qid.path = NETQID(i, Nctlqid);
-		dp->perm = 0666;
+		dp->perm = 0660;
 		dp++;
 		sprint(dp->name, "eia%dstat", i);
 		dp->qid.path = NETQID(i, Nstatqid);
@@ -675,27 +694,15 @@ ns16552clone(Chan *c, Chan *nc)
 int
 ns16552walk(Chan *c, char *name)
 {
-	return devwalk(c, name, ns16552dir, 3*nuart, devgen);
+	return devwalk(c, name, ns16552dir, ndir, devgen);
 }
 
 void
 ns16552stat(Chan *c, char *dp)
 {
-	int i;
-	Uart *p;
-	Dir dir;
-
-	i = NETID(c->qid.path);
-	switch(NETTYPE(c->qid.path)){
-	case Ndataqid:
-		p = uart[i];
-		devdir(c, c->qid, ns16552dir[3*i].name, qlen(p->iq), eve, 0660, &dir);
-		convD2M(&dir, dp);
-		break;
-	default:
-		devstat(c, dp, ns16552dir, 3*nuart, devgen);
-		break;
-	}
+	if(NETTYPE(c->qid.path) == Ndataqid)
+		setlength(NETID(c->qid.path));
+	devstat(c, dp, ns16552dir, ndir, devgen);
 }
 
 Chan*
@@ -703,12 +710,11 @@ ns16552open(Chan *c, int omode)
 {
 	Uart *p;
 
-	if(c->qid.path & CHDIR){
-		if(omode != OREAD)
-			error(Ebadarg);
-	} else if(NETTYPE(c->qid.path) == Nstatqid){
-		;
-	} else {
+	c = devopen(c, omode, ns16552dir, ndir, devgen);
+
+	switch(NETTYPE(c->qid.path)){
+	case Nctlqid:
+	case Ndataqid:
 		p = uart[NETID(c->qid.path)];
 		qlock(p);
 		p->opens++;
@@ -718,9 +724,6 @@ ns16552open(Chan *c, int omode)
 		qunlock(p);
 	}
 
-	c->mode = omode&~OTRUNC;
-	c->flag |= COPEN;
-	c->offset = 0;
 	return c;
 }
 
@@ -792,8 +795,10 @@ ns16552read(Chan *c, void *buf, long n, ulong offset)
 {
 	Uart *p;
 
-	if(c->qid.path & CHDIR)
-		return devdirread(c, buf, n, ns16552dir, 3*nuart, devgen);
+	if(c->qid.path & CHDIR){
+		setlength(-1);
+		return devdirread(c, buf, n, ns16552dir, ndir, devgen);
+	}
 
 	p = uart[NETID(c->qid.path)];
 	switch(NETTYPE(c->qid.path)){
@@ -925,6 +930,18 @@ ns16552remove(Chan *c)
 void
 ns16552wstat(Chan *c, char *dp)
 {
-	USED(c, dp);
-	error(Eperm);
+	Dir d;
+	Dirtab *dt;
+
+	if(!iseve())
+		error(Eperm);
+	if(CHDIR & c->qid.path)
+		error(Eperm);
+	if(NETTYPE(c->qid.path) == Nstatqid)
+		error(Eperm);
+
+	dt = &ns16552dir[3 * NETID(c->qid.path)];
+	convM2D(dp, &d);
+	d.mode &= 0x666;
+	dt[0].perm = dt[1].perm = d.mode;
 }