big /dev/kbd change, new format, support Alt+Stuff (key composing)

1 files changed, 1279 insertions, 0 deletions

diff --git a/sys/src/cmd/aux/kbdfs/kbdfs.c b/sys/src/cmd/aux/kbdfs/kbdfs.c
new file mode 100644
index 000000000..2da4f958f
--- /dev/null
+++ b/sys/src/cmd/aux/kbdfs/kbdfs.c
@@ -0,0 +1,1279 @@
+#include <u.h>
+#include <libc.h>
+#include <auth.h>
+#include <fcall.h>
+#include <thread.h>
+#include <keyboard.h>
+#include <9p.h>
+
+enum {
+	Nscan=	128,
+
+	Qroot=	0,
+	Qkbd,
+	Qkbin,
+	Qkbmap,
+	Qcons,
+	Qconsctl,
+	Nqid,
+
+	Rawon=	0,
+	Rawoff,
+	Kbdflush,
+
+	STACK = 8*1024,
+};
+
+typedef struct Key Key;
+typedef struct Scan Scan;
+
+struct Key {
+	int	down;
+	int	c;
+	Rune	r;
+	Rune	b;
+};
+
+struct Scan {
+	int	esc1;
+	int	esc2;
+	int	caps;
+	int	num;
+	int	shift;
+	int	ctl;
+	int	alt;
+	int	altgr;
+	int	leds;
+};
+
+struct Qtab {
+	char *name;
+	int mode;
+	int type;
+} qtab[Nqid] = {
+	"/",
+		DMDIR|0500,
+		QTDIR,
+
+	"kbd",
+		0600,
+		0,
+
+	"kbin",
+		0200,	
+		0,
+
+	"kbmap",
+		0600,	
+		0,
+
+	"cons",
+		0600,	
+		0,
+
+	"consctl",
+		0600,
+		0,
+};
+
+char Eshort[] = "read count too small";
+char Ebadarg[] = "invalid argument";
+char Eperm[] = "permission denied";
+char Einuse[] = "file in use";
+char Enonexist[] = "file does not exist";
+char Ebadspec[] = "bad attach specifier";
+char Ewalk[] = "walk in non directory";
+char Efront[] = "the front fell off";
+
+int scanfd;
+int ledsfd;
+int consfd;
+
+int kbdopen;
+int consopen;
+int consctlopen;
+
+int debug;
+
+Channel *keychan;	/* Key */
+
+Channel *reqchan;	/* Req* */
+Channel *ctlchan;	/* int */
+
+Channel *rawchan;	/* Rune */
+Channel *runechan;	/* Rune */
+Channel *linechan;	/* char * */
+Channel *kbdchan;	/* char* */
+
+/*
+ * The codes at 0x79 and 0x7b are produced by the PFU Happy Hacking keyboard.
+ * A 'standard' keyboard doesn't produce anything above 0x58.
+ */
+Rune kbtab[Nscan] = 
+{
+[0x00]	0,	0x1b,	'1',	'2',	'3',	'4',	'5',	'6',
+[0x08]	'7',	'8',	'9',	'0',	'-',	'=',	'\b',	'\t',
+[0x10]	'q',	'w',	'e',	'r',	't',	'y',	'u',	'i',
+[0x18]	'o',	'p',	'[',	']',	'\n',	Kctl,	'a',	's',
+[0x20]	'd',	'f',	'g',	'h',	'j',	'k',	'l',	';',
+[0x28]	'\'',	'`',	Kshift,	'\\',	'z',	'x',	'c',	'v',
+[0x30]	'b',	'n',	'm',	',',	'.',	'/',	Kshift,	'*',
+[0x38]	Kalt,	' ',	Kctl,	KF|1,	KF|2,	KF|3,	KF|4,	KF|5,
+[0x40]	KF|6,	KF|7,	KF|8,	KF|9,	KF|10,	Knum,	Kscroll,	'7',
+[0x48]	'8',	'9',	'-',	'4',	'5',	'6',	'+',	'1',
+[0x50]	'2',	'3',	'0',	'.',	0,	0,	0,	KF|11,
+[0x58]	KF|12,	0,	0,	0,	0,	0,	0,	0,
+[0x60]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x68]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x70]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x78]	0,	Kdown,	0,	Kup,	0,	0,	0,	0,
+};
+
+Rune kbtabshift[Nscan] =
+{
+[0x00]	0,	0x1b,	'!',	'@',	'#',	'$',	'%',	'^',
+[0x08]	'&',	'*',	'(',	')',	'_',	'+',	'\b',	'\t',
+[0x10]	'Q',	'W',	'E',	'R',	'T',	'Y',	'U',	'I',
+[0x18]	'O',	'P',	'{',	'}',	'\n',	Kctl,	'A',	'S',
+[0x20]	'D',	'F',	'G',	'H',	'J',	'K',	'L',	':',
+[0x28]	'"',	'~',	Kshift,	'|',	'Z',	'X',	'C',	'V',
+[0x30]	'B',	'N',	'M',	'<',	'>',	'?',	Kshift,	'*',
+[0x38]	Kalt,	' ',	Kctl,	KF|1,	KF|2,	KF|3,	KF|4,	KF|5,
+[0x40]	KF|6,	KF|7,	KF|8,	KF|9,	KF|10,	Knum,	Kscroll,	'7',
+[0x48]	'8',	'9',	'-',	'4',	'5',	'6',	'+',	'1',
+[0x50]	'2',	'3',	'0',	'.',	0,	0,	0,	KF|11,
+[0x58]	KF|12,	0,	0,	0,	0,	0,	0,	0,
+[0x60]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x68]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x70]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x78]	0,	Kup,	0,	Kup,	0,	0,	0,	0,
+};
+
+Rune kbtabesc1[Nscan] =
+{
+[0x00]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x08]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x10]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x18]	0,	0,	0,	0,	'\n',	Kctl,	0,	0,
+[0x20]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x28]	0,	0,	Kshift,	0,	0,	0,	0,	0,
+[0x30]	0,	0,	0,	0,	0,	'/',	0,	Kprint,
+[0x38]	Kaltgr,	0,	0,	0,	0,	0,	0,	0,
+[0x40]	0,	0,	0,	0,	0,	0,	Kbreak,	Khome,
+[0x48]	Kup,	Kpgup,	0,	Kleft,	0,	Kright,	0,	Kend,
+[0x50]	Kdown,	Kpgdown,	Kins,	Kdel,	0,	0,	0,	0,
+[0x58]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x60]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x68]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x70]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x78]	0,	Kup,	0,	0,	0,	0,	0,	0,
+};
+
+Rune kbtabaltgr[Nscan] =
+{
+[0x00]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x08]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x10]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x18]	0,	0,	0,	0,	'\n',	Kctl,	0,	0,
+[0x20]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x28]	0,	0,	Kshift,	0,	0,	0,	0,	0,
+[0x30]	0,	0,	0,	0,	0,	'/',	0,	Kprint,
+[0x38]	Kaltgr,	0,	0,	0,	0,	0,	0,	0,
+[0x40]	0,	0,	0,	0,	0,	0,	Kbreak,	Khome,
+[0x48]	Kup,	Kpgup,	0,	Kleft,	0,	Kright,	0,	Kend,
+[0x50]	Kdown,	Kpgdown,	Kins,	Kdel,	0,	0,	0,	0,
+[0x58]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x60]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x68]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x70]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x78]	0,	Kup,	0,	0,	0,	0,	0,	0,
+};
+
+Rune kbtabctl[Nscan] =
+{
+[0x00]	0,	'', 	'', 	'', 	'', 	'', 	'', 	'', 
+[0x08]	'', 	'', 	'', 	'', 	'
', 	'', 	'\b',	'\t',
+[0x10]	'', 	'', 	'', 	'', 	'', 	'', 	'', 	'\t',
+[0x18]	'', 	'', 	'', 	'', 	'\n',	Kctl,	'
', 	'', 
+[0x20]	'', 	'', 	'', 	'\b',	'\n',	'', 	'', 	'', 
+[0x28]	'', 	0, 	Kshift,	'', 	'', 	'', 	'', 	'', 
+[0x30]	'', 	'', 	'
', 	'', 	'', 	'', 	Kshift,	'\n',
+[0x38]	Kalt,	0, 	Kctl,	'', 	'', 	'', 	'', 	'', 
+[0x40]	'', 	'', 	'', 	'
', 	'', 	'', 	'', 	'', 
+[0x48]	'', 	'', 	'
', 	'', 	'', 	'', 	'', 	'', 
+[0x50]	'', 	'', 	'', 	'', 	0,	0,	0,	'', 
+[0x58]	'', 	0,	0,	0,	0,	0,	0,	0,
+[0x60]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x68]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x70]	0,	0,	0,	0,	0,	0,	0,	0,
+[0x78]	0,	'', 	0,	'\b',	0,	0,	0,	0,
+};
+
+void reboot(void);
+
+/*
+ * Scan code processing
+ */
+void
+kbdputsc(Scan *scan, int c)
+{
+	Key key;
+
+	/*
+	 *  e0's is the first of a 2 character sequence, e1 the first
+	 *  of a 3 character sequence (on the safari)
+	 */
+	if(c == 0xe0){
+		scan->esc1 = 1;
+		return;
+	} else if(c == 0xe1){
+		scan->esc2 = 2;
+		return;
+	}
+
+	key.down = (c & 0x80) == 0;
+	key.c = c & 0x7f;
+
+	if(key.c >= Nscan)
+		return;
+
+	if(scan->esc1)
+		key.r = kbtabesc1[key.c];
+	else if(scan->shift)
+		key.r = kbtabshift[key.c];
+	else if(scan->altgr)
+		key.r = kbtabaltgr[key.c];
+	else if(scan->ctl)
+		key.r = kbtabctl[key.c];
+	else
+		key.r = kbtab[key.c];
+
+	switch(key.r){
+	case Spec|0x60:
+		key.r = Kshift;
+		break;
+	case Spec|0x62:
+		key.r = Kctl;
+		break;
+	case Spec|0x63:
+		key.r = Kalt;
+		break;
+	}
+
+	if(scan->esc1)
+		key.b = key.r;
+	else
+		key.b = kbtab[key.c];
+
+	if(scan->caps && key.r<='z' && key.r>='a')
+		key.r += 'A' - 'a';
+
+	if(scan->ctl && scan->alt && key.r == Kdel)
+		reboot();
+
+	send(keychan, &key);
+
+	if(scan->esc1)
+		scan->esc1 = 0;
+	else if(scan->esc2)
+		scan->esc2--;
+
+	switch(key.r){
+	case Kshift:
+		scan->shift = key.down;
+		break;
+	case Kctl:
+		scan->ctl = key.down;
+		break;
+	case Kaltgr:
+		scan->altgr = key.down;
+		break;
+	case Kalt:
+		scan->alt = key.down;
+		break;
+	case Knum:
+		scan->num ^= key.down;
+		break;
+	case Kcaps:
+		scan->caps ^= key.down;
+		break;
+	}
+}
+
+void
+setleds(Scan *scan, int leds)
+{
+	char buf[8];
+
+	if(ledsfd < 0 || scan->leds == leds)
+		return;
+	leds &= 7;
+	snprint(buf, sizeof(buf), "%d", leds);
+	pwrite(ledsfd, buf, strlen(buf), 0);
+	scan->leds = leds;
+}
+
+/*
+ * Read scan codes from scanfd
+ */ 
+void
+scanproc(void *)
+{
+	uchar buf[64];
+	Scan scan;
+	int i, n;
+
+	threadsetname("scanproc");
+
+	memset(&scan, 0, sizeof scan);
+	while((n = read(scanfd, buf, sizeof buf)) > 0){
+		for(i=0; i<n; i++)
+			kbdputsc(&scan, buf[i]);
+		setleds(&scan, (scan.num<<1) | (scan.caps<<2));
+	}
+}
+
+char*
+utfconv(Rune *r, int n)
+{
+	char *s, *p;
+	int l;
+
+	l = runenlen(r, n) + 1;
+	s = emalloc9p(l);
+	for(p = s; n > 0; r++, n--)
+		p += runetochar(p, r);
+	*p = 0;
+	return s;
+}
+
+/*
+ * Read key events from keychan and produce characters to
+ * rawchan and keystate in kbdchan. this way here is only
+ * one global keystate even if multiple keyboards are used.
+ */
+void
+keyproc(void *)
+{
+	Rune rb[Nscan*2+1];
+	int cb[Nscan];
+	Key key;
+	int i, nb;
+	char *s;
+
+	threadsetname("keyproc");
+
+	nb = 0;
+	while(recv(keychan, &key) > 0){
+		if(key.down && key.r)
+			nbsend(rawchan, &key.r);
+
+		rb[0] = 0;
+		for(i=0; i<nb && cb[i] != key.c; i++)
+			;
+		if(!key.down){
+			while(i < nb && cb[i] == key.c){
+				memmove(cb+i, cb+i+1, (nb-i+1) * sizeof(cb[0]));
+				memmove(rb+i+1, rb+i+2, (nb-i+1) * sizeof(rb[0]));
+				nb--;
+				rb[0] = 'K';
+			}
+		} else if(i == nb && nb < nelem(cb) && key.b){
+			cb[nb] = key.c;
+			rb[nb+1] = key.b;
+			nb++;
+			if(nb < nelem(cb) && key.r && key.b != key.r){
+				cb[nb] = key.c;
+				rb[nb+1] = key.r;
+				nb++;
+			}
+			rb[0] = 'k';
+		}
+		if(rb[0]){
+			s = utfconv(rb, nb+1);
+			if(nbsendp(kbdchan, s) <= 0)
+				free(s);
+		}
+	}
+}
+
+/*
+ * Read characters from consfd (serial console)
+ */ 
+void
+consproc(void *)
+{
+	char *p, *e, *x, buf[64];
+	int n, cr;
+	Rune r;
+
+	threadsetname("consproc");
+
+	cr = 0;
+	p = buf;
+	e = buf + sizeof(buf);
+	while((n = read(consfd, p, e - p)) > 0){
+		x = buf + n;
+		while(p < x && fullrune(p, x - p)){
+			p += chartorune(&r, p);
+			if(r){
+				if(r == '\n' && cr){
+					cr = 0;
+					continue;
+				}
+				if(cr = (r == '\r'))
+					r = '\n';
+				send(runechan, &r);
+			}
+		}
+		n = x - p;
+		memmove(buf, p, n);
+		p = buf + n;
+	}
+}
+
+static int
+nextrune(Channel *ch, Rune *r)
+{
+	while(recv(ch, r) > 0){
+		switch(*r){
+		case 0:
+		case Kcaps:
+		case Knum:
+		case Kshift:
+		case Kctl:
+		case Kaltgr:
+			/* ignore these special keys */
+			continue;
+
+		case Kalt:
+			/* latin escape! */
+			return 1;
+		}
+		return 0;
+	}
+	return -1;
+}
+
+/*
+ * Read runes from rawchan, possibly compose special characters
+ * and output the new runes to runechan
+ */
+void
+runeproc(void *)
+{
+	static struct {
+		char	*ld;		/* must be seen before using this conversion */
+		char	*si;		/* options for last input characters */
+		Rune	*so;		/* the corresponding Rune for each si entry */
+	} tab[] = {
+#include "latin1.h"
+	};
+	Rune r, rr;
+	int i, j;
+
+	threadsetname("runeproc");
+
+	while((i = nextrune(rawchan, &r)) >= 0){
+		if(i == 0){
+Forward:
+			send(runechan, &r);
+			continue;
+		}
+
+		/* latin sequence */
+		if(nextrune(rawchan, &r))
+			continue;
+
+		if(r == 'X'){
+			r = 0;
+			for(i = 0; i<4; i++){
+				if(nextrune(rawchan, &rr))
+					break;
+				r <<= 4;
+				if(rr >= '0' && rr <= '9')
+					r |= (rr - '0');
+				else if(rr >= 'a' && rr <= 'f')
+					r |= 10 + (rr - 'a');
+				else if(rr >= 'A' && rr <= 'F')
+					r |= 10 + (rr - 'A');
+				else
+					break;
+			}
+			if(i == 4 && r > 0)
+				goto Forward;
+		} else {
+			if(nextrune(rawchan, &rr))
+				continue;
+			for(i = 0; i<nelem(tab); i++){
+				if(tab[i].ld[0] != r)
+					continue;
+				if(tab[i].ld[1] == 0)
+					break;	
+				if(tab[i].ld[1] == rr){
+					nextrune(rawchan, &rr);
+					break;
+				}
+			}
+			if(i == nelem(tab) || rr == 0)
+				continue;
+			for(j = 0; tab[i].si[j]; j++){
+				if(tab[i].si[j] != rr)
+					continue;
+				r = tab[i].so[j];
+				goto Forward;
+			}
+		}
+	}
+}
+
+/*
+ * Cook lines for cons
+ */
+void
+lineproc(void *aux)
+{
+	Rune rb[256], r;
+	Channel *cook;
+	int nr, done;
+	
+	cook = aux;
+
+	threadsetname("lineproc");
+
+	for(;;){
+		nr = 0;
+		done = 0;
+		do {
+			recv(cook, &r);
+			switch(r){
+			case '\0':	/* flush */
+				nr = 0;
+				continue;
+			case '\b':	/* backspace */
+			case Knack:	/* ^U */
+				while(nr > 0){
+					nr--;
+					fprint(1, "\b");
+					if(r == '\b')
+						break;
+				}
+				continue;
+			case Keof:	/* ^D */
+				done = 1;
+				break;
+			case '\n':
+				done = 1;
+				/* no break */
+			default:
+				rb[nr++] = r;
+				fprint(1, "%C", r);
+			}
+		} while(!done && nr < nelem(rb));
+		sendp(linechan, utfconv(rb, nr));
+	}
+}
+
+/*
+ * Queue reads to cons and kbd, flushing and
+ * relay data between 9p and rawchan / kbdchan.
+ */
+void
+ctlproc(void *)
+{
+	struct {
+		Req *h;
+		Req **t;
+	} qcons, qkbd, *q;
+	enum { Areq, Actl, Arune, Aline, Akbd, Aend };
+	Alt a[Aend+1];
+	Req *req;
+	Fid *fid;
+	Rune r;
+	char *s, *b, *p, *e;
+	int c, n, raw;
+	Channel *cook;
+
+	threadsetname("ctlproc");
+
+	cook = chancreate(sizeof(Rune), 0);
+
+	if(scanfd >= 0)
+		proccreate(scanproc, nil, STACK);	/* scanfd -> keychan */
+	if(consfd >= 0)
+		proccreate(consproc, nil, STACK);	/* consfd -> runechan */
+
+	threadcreate(keyproc, nil, STACK);		/* keychan -> rawchan, kbdchan */
+	threadcreate(runeproc, nil, STACK);		/* rawchan -> runechan */
+	threadcreate(lineproc, cook, STACK);		/* cook -> linechan */
+
+	raw = 0;
+
+	b = p = e = nil;
+
+	qcons.h = nil;
+	qcons.t = &qcons.h;
+	qkbd.h = nil;
+	qkbd.t = &qkbd.h;
+
+	memset(a, 0, sizeof a);
+
+	a[Areq].c = reqchan;
+	a[Areq].v = &req;
+	a[Areq].op = CHANRCV;
+
+	a[Actl].c = ctlchan;
+	a[Actl].v = &c;
+	a[Actl].op = CHANRCV;
+
+	a[Arune].c = runechan;
+	a[Arune].v = &r;
+	a[Arune].op = CHANRCV;
+
+	a[Aline].c = linechan;
+	a[Aline].v = &s;
+	a[Aline].op = CHANRCV;
+
+	a[Akbd].c = kbdchan;
+	a[Akbd].v = &s;
+	a[Akbd].op = CHANRCV;
+
+	a[Aend].op = CHANEND;
+
+	for(;;){
+		s = nil;
+
+		if(kbdopen){
+			a[Arune].op = qkbd.h ? CHANRCV : CHANNOP;
+			a[Akbd].op = qkbd.h ? CHANRCV : CHANNOP;
+			a[Aline].op = CHANNOP;
+		}else{
+			a[Arune].op = (b == nil) ? CHANRCV : CHANNOP;
+			a[Akbd].op = CHANRCV;
+			a[Aline].op = (b == nil) ? CHANRCV : CHANNOP;
+		}
+
+		switch(alt(a)){
+		case Areq:
+			fid = req->fid;
+			if(req->ifcall.type == Tflush){
+				Req **rr;
+
+				fid = req->oldreq->fid;
+				q = fid->qid.path == Qcons ? &qcons : &qkbd;
+				for(rr = &q->h; *rr && *rr != req->oldreq; rr = &((*rr)->aux))
+					;
+				if(*rr == req->oldreq){
+					if((*rr = req->oldreq->aux) == nil)
+						q->t = rr;
+					req->oldreq->aux = nil;
+					respond(req->oldreq, "interrupted");
+				}
+				respond(req, nil);
+			} else if(req->ifcall.type == Tread){
+				q = fid->qid.path == Qcons ? &qcons : &qkbd;
+				req->aux = nil;
+				*q->t = req;
+				q->t = &req->aux;
+				goto Havereq;
+			} else
+				respond(req, Efront);
+			break;
+
+		case Actl:
+			switch(c){
+			case Rawoff:
+			case Rawon:
+				if(raw = (c == Rawon)){
+					while(s = nbrecvp(linechan))
+						free(s);
+					r = '\0';
+					send(cook, &r);
+					free(b);
+					b = nil;
+				}
+				break;
+			case Kbdflush:
+				while(s = nbrecvp(kbdchan))
+					free(s);
+				break;
+			}
+			break;
+
+		case Arune:
+			if(kbdopen){
+				s = emalloc9p(UTFmax+2);
+				s[0] = 'c';
+				s[1+runetochar(s+1, &r)] = 0;
+				goto Havekbd;
+			}
+
+			if(raw){
+				s = emalloc9p(UTFmax+1);
+				s[runetochar(s, &r)] = 0;
+			} else {
+				nbsend(cook, &r);
+				break;
+			}
+			/* no break */
+
+		case Aline:
+			b = s;
+			p = s;
+			e = s + strlen(s);
+
+		Havereq:
+			while(b && (req = qcons.h)){
+				if((qcons.h = req->aux) == nil)
+					qcons.t = &qcons.h;
+				n = e - p;
+				if(req->ifcall.count < n)
+					n = req->ifcall.count;
+				req->ofcall.count = n;
+				memmove(req->ofcall.data, p, n);
+				respond(req, nil);
+				p += n;
+				if(p >= e){
+					free(b);
+					b = nil;
+				}
+			}
+			break;
+
+		case Akbd:
+		Havekbd:
+			if(req = qkbd.h){
+				if((qkbd.h = req->aux) == nil)
+					qkbd.t = &qkbd.h;
+				n = strlen(s) + 1;
+				if(n > req->ifcall.count)
+					respond(req, Eshort);
+				else {
+					req->ofcall.count = n;
+					memmove(req->ofcall.data, s, n);
+					respond(req, nil);
+				}
+			}
+			free(s);
+			break;
+		}
+	}
+}
+
+/*
+ * Keyboard layout maps
+ */
+
+Rune*
+kbmapent(int t, int sc)
+{
+	if(sc < 0 || sc >= Nscan)
+		return nil;
+	switch(t){
+	default:
+		return nil;
+	case 0:
+		return &kbtab[sc];
+	case 1:
+		return &kbtabshift[sc];
+	case 2:
+		return &kbtabesc1[sc];
+	case 3:
+		return &kbtabaltgr[sc];
+	case 4:
+		return &kbtabctl[sc];
+	}
+}
+
+void
+kbmapread(Req *req)
+{
+	char tmp[3*12+1];
+	int t, sc, off, n;
+	Rune *rp;
+
+	off = req->ifcall.offset/(sizeof(tmp)-1);
+	t = off/Nscan;
+	sc = off%Nscan;
+	if(rp = kbmapent(t, sc))
+		sprint(tmp, "%11d %11d %11d\n", t, sc, *rp);
+	else
+		*tmp = 0;
+	n = strlen(tmp);
+	if(req->ifcall.count < n)
+		n = req->ifcall.count;
+	req->ofcall.count = n;
+	memmove(req->ofcall.data, tmp, n);
+	respond(req, nil);
+}
+
+void
+kbmapwrite(Req *req)
+{
+	char line[100], *lp, *b;
+	Rune r, *rp;
+	int sc, t, l;
+	Fid *f;
+
+	f = req->fid;
+	b = req->ifcall.data;
+	l = req->ifcall.count;
+	lp = line;
+	if(f->aux){
+		strcpy(line, f->aux);
+		lp = line+strlen(line);
+		free(f->aux);
+		f->aux = nil;
+	}
+	while(--l >= 0) {
+		*lp++  = *b++;
+		if(lp[-1] == '\n' || lp == &line[sizeof(line)-1]) {
+			*lp = 0;
+			if(*line == 0){
+			Badarg:
+				respond(req, Ebadarg);
+				return;
+			}
+			if(*line == '\n' || *line == '#'){
+				lp = line;
+				continue;
+			}
+			lp = line;
+			while(*lp == ' ' || *lp == '\t')
+				lp++;
+			t = strtoul(line, &lp, 0);
+			sc = strtoul(lp, &lp, 0);
+			while(*lp == ' ' || *lp == '\t')
+				lp++;
+			if((rp = kbmapent(t, sc)) == nil)
+				goto Badarg;
+			r = 0;
+			if(*lp == '\'' && lp[1])
+				chartorune(&r, lp+1);
+			else if(*lp == '^' && lp[1]){
+				chartorune(&r, lp+1);
+				if(0x40 <= r && r < 0x60)
+					r -= 0x40;
+				else
+					goto Badarg;
+			}else if(*lp == 'M' && ('1' <= lp[1] && lp[1] <= '5'))
+				r = 0xF900+lp[1]-'0';
+			else if(*lp>='0' && *lp<='9') /* includes 0x... */
+				r = strtoul(lp, &lp, 0);
+			else
+				goto Badarg;
+			*rp = r;
+			lp = line;
+		}
+	}
+	if(lp != line){
+		l = lp-line;
+		f->aux = lp = emalloc9p(l+1);
+		memmove(lp, line, l);
+		lp[l] = 0;
+	}
+	req->ofcall.count = req->ifcall.count;
+	respond(req, nil);
+}
+
+/*
+ * Filesystem
+ */
+
+static char*
+getauser(void)
+{
+	static char user[64];
+	int fd;
+	int n;
+
+	if(*user)
+		return user;
+	if((fd = open("/dev/user", OREAD)) < 0)
+		strcpy(user, "none");
+	else {
+		n = read(fd, user, (sizeof user)-1);
+		close(fd);
+		if(n < 0)
+			strcpy(user, "none");
+		else
+			user[n] = 0;
+	}
+	return user;
+}
+
+static int
+fillstat(ulong qid, Dir *d)
+{
+	struct Qtab *t;
+
+	memset(d, 0, sizeof *d);
+	d->uid = getauser();
+	d->gid = getauser();
+	d->muid = "";
+	d->qid = (Qid){qid, 0, 0};
+	d->atime = time(0);
+	t = qtab + qid;
+	d->name = t->name;
+	d->qid.type = t->type;
+	d->mode = t->mode;
+	return 1;
+}
+
+static void
+fsattach(Req *r)
+{
+	char *spec;
+
+	spec = r->ifcall.aname;
+	if(spec && spec[0]){
+		respond(r, Ebadspec);
+		return;
+	}
+	r->fid->qid = (Qid){Qroot, 0, QTDIR};
+	r->ofcall.qid = r->fid->qid;
+	respond(r, nil);
+}
+
+static void
+fsstat(Req *r)
+{
+	fillstat((ulong)r->fid->qid.path, &r->d);
+	r->d.name = estrdup9p(r->d.name);
+	r->d.uid = estrdup9p(r->d.uid);
+	r->d.gid = estrdup9p(r->d.gid);
+	r->d.muid = estrdup9p(r->d.muid);
+	respond(r, nil);
+}
+
+static char*
+fswalk1(Fid *fid, char *name, Qid *qid)
+{
+	int i;
+	ulong path;
+
+	path = fid->qid.path;
+	switch(path){
+	case Qroot:
+		if (strcmp(name, "..") == 0) {
+			*qid = (Qid){Qroot, 0, QTDIR};
+			fid->qid = *qid;
+			return nil;
+		}
+		for(i = fid->qid.path; i<Nqid; i++){
+			if(strcmp(name, qtab[i].name) != 0)
+				continue;
+			*qid = (Qid){i, 0, 0};
+			fid->qid = *qid;
+			return nil;
+		}
+		return Enonexist;
+		
+	default:
+		return Ewalk;
+	}
+}
+
+static void
+fsopen(Req *r)
+{
+	Fid *f;
+	static int need[4] = { 4, 2, 6, 1 };
+	struct Qtab *t;
+	int n;
+
+	f = r->fid;
+	t = qtab + f->qid.path;
+	n = need[r->ifcall.mode & 3]<<6;
+	if((n & t->mode) != n)
+		respond(r, Eperm);
+	else{
+		f->aux = nil;
+		switch((ulong)f->qid.path){
+		case Qkbd:
+			if(kbdopen){
+				respond(r, Einuse);
+				return;
+			}
+			kbdopen++;
+			sendul(ctlchan, Kbdflush);
+			break;
+		case Qcons:
+			consopen++;
+			break;
+		case Qconsctl:
+			consctlopen++;
+			break;
+		}
+		respond(r, nil);
+	}
+}
+
+static int
+readtopdir(Fid*, uchar *buf, long off, int cnt, int blen)
+{
+	int i, m, n;
+	long pos;
+	Dir d;
+
+	n = 0;
+	pos = 0;
+	for (i = 1; i < Nqid; i++){
+		fillstat(i, &d);
+		m = convD2M(&d, &buf[n], blen-n);
+		if(off <= pos){
+			if(m <= BIT16SZ || m > cnt)
+				break;
+			n += m;
+			cnt -= m;
+		}
+		pos += m;
+	}
+	return n;
+}
+
+static void
+fsread(Req *r)
+{
+	Fid *f;
+
+	f = r->fid;
+	switch((ulong)f->qid.path){
+	default:
+		respond(r, Efront);
+		return;
+
+	case Qroot:
+		r->ofcall.count = readtopdir(f, (void*)r->ofcall.data, r->ifcall.offset,
+			r->ifcall.count, r->ifcall.count);
+		break;
+
+	case Qkbd:
+	case Qcons:
+		sendp(reqchan, r);
+		return;
+
+	case Qkbmap:
+		kbmapread(r);
+		return;
+	}
+	respond(r, nil);
+}
+
+static void
+fswrite(Req *r)
+{
+	Fid *f;
+	char *p;
+	int n, i;
+
+	f = r->fid;
+	switch((ulong)f->qid.path){
+	default:
+		respond(r, Efront);
+		return;
+
+	case Qcons:
+		n = r->ifcall.count;
+		if(write(1, r->ifcall.data, n) != n){
+			responderror(r);
+			return;
+		}
+		r->ofcall.count = n;
+		break;
+
+	case Qconsctl:
+		p = r->ifcall.data;
+		n = r->ifcall.count;
+		if(n >= 5 && memcmp(p, "rawon", 5) == 0)
+			sendul(ctlchan, Rawon);
+		else if(n >= 6 && memcmp(p, "rawoff", 6) == 0)
+			sendul(ctlchan, Rawoff);
+		else {
+			respond(r, Ebadarg);
+			return;
+		}
+		r->ofcall.count = n;
+		break;
+
+	case Qkbin:
+		if(f->aux == nil){
+			f->aux = emalloc9p(sizeof(Scan));
+			memset(f->aux, 0, sizeof(Scan));
+		}
+		for(i=0; i<r->ifcall.count; i++)
+			kbdputsc((Scan*)f->aux, (uchar)r->ifcall.data[i]);
+		r->ofcall.count = i;
+		break;
+
+	case Qkbmap:
+		kbmapwrite(r);
+		return;
+
+	}
+	respond(r, nil);
+}
+
+static void
+fsflush(Req *r)
+{
+	switch((ulong)r->oldreq->fid->qid.path) {
+	case Qkbd:
+	case Qcons:
+		sendp(reqchan, r);
+		return;
+	}
+	respond(r, nil);
+}
+
+static void
+fsdestroyfid(Fid *f)
+{
+	void *p;
+
+	if(f->omode != -1)
+		switch((ulong)f->qid.path){
+		case Qkbin:
+		case Qkbmap:
+			if(p = f->aux){
+				f->aux = nil;
+				free(p);
+			}
+			break;
+		case Qkbd:
+			kbdopen--;
+			break;
+		case Qcons:
+			consopen--;
+			break;
+		case Qconsctl:
+			if(--consctlopen == 0)
+				sendul(ctlchan, Rawoff);
+			break;
+		}
+}
+
+static void
+fsend(Srv*)
+{
+	threadexitsall(nil);
+}
+
+Srv fs = {
+	.attach=			fsattach,
+	.walk1=			fswalk1,
+	.open=			fsopen,
+	.read=			fsread,
+	.write=			fswrite,
+	.stat=			fsstat,
+	.flush=			fsflush,
+	.destroyfid=		fsdestroyfid,
+	.end=			fsend,
+};
+
+void
+reboot(void)
+{
+	int fd;
+
+	if(debug)
+		return;
+
+	if((fd = open("/dev/reboot", OWRITE)) < 0){
+		fprint(2, "can't open /dev/reboot: %r\n");
+		return;
+	}
+	fprint(fd, "reboot\n");
+	close(fd);
+}
+
+void
+elevate(void)
+{
+	char buf[128];
+	Dir *d, nd;
+	int fd;
+
+	if(debug)
+		return;
+
+	snprint(buf, sizeof(buf), "/proc/%d/ctl", getpid());
+	if((fd = open(buf, OWRITE)) < 0){
+		fprint(2, "can't open %s: %r\n", buf);
+		return;
+	}
+
+	/* get higher than normal priority */
+	fprint(fd, "pri 16\n");
+
+	/* always present in physical memory */
+	fprint(fd, "noswap\n");
+
+	/* dont let anybody kill us */
+	if(d = dirfstat(fd)){
+		nulldir(&nd);
+		nd.mode = d->mode & ~0222;
+		dirfwstat(fd, &nd);
+		free(d);
+	}
+
+	close(fd);
+	
+}
+
+void
+usage(void)
+{
+	fprint(2, "usage: %s [ -dD ] [ -s srv ] [ -m mntpnt ] [ file ]\n", argv0);
+	exits("usage");
+}
+
+void
+threadmain(int argc, char** argv)
+{
+	char *mtpt = "/dev";
+	char *srv = nil;
+
+	consfd = -1;
+
+	ARGBEGIN{
+	case 'd':
+		debug++;
+		break;
+	case 'D':
+		chatty9p++;
+		break;
+	case 's':
+		srv = EARGF(usage());
+		break;
+	case 'm':
+		mtpt = EARGF(usage());
+		break;
+	default:
+		usage();
+	}ARGEND
+
+	if((scanfd = open("/dev/scancode", OREAD)) < 0)
+		fprint(2, "%s: warning: can't open /dev/scancode: %r\n", argv0);
+	if((ledsfd = open("/dev/leds", OWRITE)) < 0)
+		fprint(2, "%s: warning: can't open /dev/leds: %r\n", argv0);
+
+	if(*argv)
+		if((consfd = open(*argv, OREAD)) < 0)
+			fprint(2, "%s: warning: can't open %s: %r\n", argv0, *argv);
+
+	keychan = chancreate(sizeof(Key), 8);
+	reqchan = chancreate(sizeof(Req*), 0);
+	ctlchan = chancreate(sizeof(int), 0);
+	rawchan = chancreate(sizeof(Rune), 16);
+	runechan = chancreate(sizeof(Rune), 32);
+	linechan = chancreate(sizeof(char*), 16);
+	kbdchan = chancreate(sizeof(char*), 16);
+
+	if(!(keychan && reqchan && ctlchan && rawchan && runechan && linechan && kbdchan))
+		sysfatal("allocating chans");
+
+	elevate();
+	procrfork(ctlproc, nil, STACK, RFNAMEG|RFNOTEG);
+	threadpostmountsrv(&fs, srv, mtpt, MBEFORE);
+}