code: plan9front

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rio: add /dev/kbdtap

--- a/sys/src/cmd/rio/dat.h

+++ b/sys/src/cmd/rio/dat.h

@@ -18,6 +18,7 @@

 	Qwindow,

 	Qwsys,		/* directory of window directories */

 	Qwsysdir,		/* window directory, child of wsys */

+	Qtap,

 	QMAX,

 };

@@ -40,6 +41,7 @@

 typedef	struct	Wctlmesg Wctlmesg;

 typedef	struct	Window Window;

 typedef	struct	Xfid Xfid;

+typedef struct	Tapmesg Tapmesg;

 enum

 {

@@ -117,8 +119,20 @@

 	ulong	lastcounter;	/* serial no. of last mouse event sent to client */

 	int	lastb;	/* last button state we received */

 	uchar	qfull;	/* filled the queue; no more recording until client comes back */	

-};	

+};

+enum{

+	Fon = 'b',

+	Foff = 'e',

+	Freset = 'r',

+};

+

+struct Tapmesg

+{

+	char type;

+	char *s;

+};

+

 struct Window

 {

 	Ref;

@@ -313,6 +327,8 @@

 int		snarffd;

 int		gotscreen;

 int		servekbd;

+Channel	*fromtap; 	/* input from kbd tap program to window */

+Channel *totap; 	/* our keyboard input to tap program */

 Window	*input;

 QLock	all;			/* BUG */

 Filsys	*filsys;

--- a/sys/src/cmd/rio/fsys.c

+++ b/sys/src/cmd/rio/fsys.c

@@ -37,6 +37,7 @@

 	{ "wctl",		QTFILE,	Qwctl,		0600 },

 	{ "window",	QTFILE,	Qwindow,		0400 },

 	{ "wsys",		QTDIR,	Qwsys,		0500|DMDIR },

+	{ "kbdtap",	QTFILE,	Qtap,	0660 },

 	{ nil, }

 };

@@ -115,6 +116,16 @@

 	return 0;

 }

+void

+toggletap(char mode)

+{

+	Tapmesg m;

+

+	m.type = mode;

+	m.s = nil;

+	send(fromtap, &m);

+}

+

 Filsys*

 filsysinit(Channel *cxfidalloc)

 {

@@ -506,7 +517,9 @@

 	}

 	if(((f->dir->perm&~(DMDIR|DMAPPEND))&m) != m)

 		goto Deny;

-		

+

+	if(FILE(f->qid) == Qtap)

+		toggletap(Fon);

 	sendp(x->c, xfidopen);

 	return nil;

@@ -616,6 +629,8 @@

 	if(f->open){

 		f->busy = FALSE;

 		f->open = FALSE;

+		if(FILE(f->qid) == Qtap)

+			toggletap(Foff);

 		sendp(x->c, xfidclose);

 		return nil;

 	}

--- a/sys/src/cmd/rio/rio.c

+++ b/sys/src/cmd/rio/rio.c

@@ -199,6 +199,9 @@

 	kbdchan = initkbd();

 	if(kbdchan == nil)

 		error("can't find keyboard");

+	totap = chancreate(sizeof(char*), 0);

+	fromtap = chancreate(sizeof(Tapmesg), 0);

+

 	wscreen = allocscreen(screen, background, 0);

 	if(wscreen == nil)

 		error("can't allocate screen");

@@ -340,15 +343,64 @@

 keyboardthread(void*)

 {

 	char *s;

+	Tapmesg m;

+	Channel *out;

+	int mode;

+	enum { Kdev, Ktap, NALT};

+	enum { Mnorm, Mfilt };

-	threadsetname("keyboardthread");

+	threadsetname("keyboardthread");	

-	while(s = recvp(kbdchan)){

-		if(*s == 'k' || *s == 'K')

-			shiftdown = utfrune(s+1, Kshift) != nil;

-		if(input == nil || sendp(input->ck, s) <= 0)

-			free(s);

-	}

+	static Alt alts[NALT+1];

+	alts[Kdev].c = kbdchan;

+	alts[Kdev].v = &s;

+	alts[Kdev].op = CHANRCV;

+	alts[Ktap].c = fromtap;

+	alts[Ktap].v = &m;

+	alts[Ktap].op = CHANRCV;

+	alts[NALT].op = CHANEND;

+

+	out = nil;

+	mode = Mnorm;

+	for(;;)

+		switch(alt(alts)){

+		case Ktap:

+			switch(m.type){

+			case 'K': case 'k': case 'c':

+				break;

+			case Freset:

+				if(mode != Mfilt)

+					continue;

+				s = smprint("%c", m.type);

+				goto Send;

+			case Foff:

+				mode = Mnorm;

+				continue;

+			case Fon:

+				mode = Mfilt;

+				continue;

+			default:

+				continue;

+			}

+			s = smprint("%c%s", m.type, m.s);

+			out = input == nil ? nil : input->ck;

+			goto Send;

+		case Kdev:

+			switch(mode){

+			case Mnorm:

+				out = input == nil ? nil : input->ck;

+				break;

+			case Mfilt:

+				out = totap;

+				break;

+			}

+		Send:

+			if(*s == 'k' || *s == 'K')

+				shiftdown = utfrune(s+1, Kshift) != nil;

+			if(out == nil || sendp(out, s) <= 0)

+				free(s);

+			break;

+		}

 }

 int

--- a/sys/src/cmd/rio/wind.c

+++ b/sys/src/cmd/rio/wind.c

@@ -81,6 +81,7 @@

 wcurrent(Window *w)

 {

 	Channel *c;

+	Tapmesg m;

 	if(input == nil){

 		input = w;

@@ -88,6 +89,9 @@

 	}

 	if(w == input)

 		return;

+	m.type = Freset;

+	m.s = nil;

+	send(fromtap, &m);

 	incref(input);

 	c = chancreate(sizeof(Window*), 0);

 	wsendctlmesg(input, Repaint, ZR, c);

--- a/sys/src/cmd/rio/xfid.c

+++ b/sys/src/cmd/rio/xfid.c

@@ -376,6 +376,7 @@

 	Window *w;

 	Rune *r;

 	Conswritemesg cwm;

+	Tapmesg fmsg;

 	Stringpair pair;

 	enum { CWdata, CWgone, CWflush, NCW };

 	Alt alts[NCW+1];

@@ -568,6 +569,16 @@

 		}

 		break;

+	case Qtap:

+		if(cnt < 2){

+			filsysrespond(x->fs, x, &fc, "malformed key");

+			return;

+		}

+		fmsg.type = x->data[0];

+		fmsg.s = strdup(x->data+1);

+		send(fromtap, &fmsg);

+		break;

+

 	default:

 		fprint(2, "unknown qid %d in write\n", qid);

 		filsysrespond(x->fs, x, &fc, "unknown qid in write");

@@ -678,6 +689,14 @@

 		recv(c2, &pair);

 		fc.data = pair.s;

 		fc.count = min(cnt, pair.ns);

+		filsysrespond(x->fs, x, &fc, nil);

+		free(t);

+		break;

+

+	case Qtap:

+		recv(totap, &t);

+		fc.data = t;

+		fc.count = strlen(t)+1;

 		filsysrespond(x->fs, x, &fc, nil);

 		free(t);

 		break;