ref: 1bfde841484fadb1c41f41a6279e7e070f61a31b
dir: /sys/src/cmd/rio/xfid.c/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <thread.h>
#include <cursor.h>
#include <mouse.h>
#include <keyboard.h>
#include <frame.h>
#include <fcall.h>
#include <plumb.h>
#include "dat.h"
#include "fns.h"
char Einuse[] = "file in use";
char Edeleted[] = "window deleted";
char Etooshort[] = "buffer too small";
char Eshort[] = "short i/o request";
char Elong[] = "snarf buffer too long";
char Eunkid[] = "unknown id in attach";
char Ebadrect[] = "bad rectangle in attach";
char Ewindow[] = "cannot make window";
char Enowindow[] = "window has no image";
char Ebadmouse[] = "bad format on /dev/mouse";
extern char Eperm[];
extern char Enomem[];
static Xfid *xfidfree;
static Xfid *xfid;
static Channel *cxfidalloc; /* chan(Xfid*) */
static Channel *cxfidfree; /* chan(Xfid*) */
static char *tsnarf;
static int ntsnarf;
void
xfidallocthread(void*)
{
Xfid *x;
enum { Alloc, Free, N };
static Alt alts[N+1];
alts[Alloc].c = cxfidalloc;
alts[Alloc].v = nil;
alts[Alloc].op = CHANRCV;
alts[Free].c = cxfidfree;
alts[Free].v = &x;
alts[Free].op = CHANRCV;
alts[N].op = CHANEND;
for(;;){
switch(alt(alts)){
case Alloc:
x = xfidfree;
if(x)
xfidfree = x->free;
else{
x = emalloc(sizeof(Xfid));
x->c = chancreate(sizeof(void(*)(Xfid*)), 0);
x->flushc = chancreate(sizeof(int), 0); /* notification only; no data */
x->flushtag = -1;
x->next = xfid;
xfid = x;
threadcreate(xfidctl, x, 16384);
}
if(x->ref != 0){
fprint(2, "%p incref %ld\n", x, x->ref);
error("incref");
}
if(x->flushtag != -1)
error("flushtag in allocate");
incref(x);
sendp(cxfidalloc, x);
break;
case Free:
if(x->ref != 0){
fprint(2, "%p decref %ld\n", x, x->ref);
error("decref");
}
if(x->flushtag != -1)
error("flushtag in free");
x->free = xfidfree;
xfidfree = x;
break;
}
}
}
Channel*
xfidinit(void)
{
cxfidalloc = chancreate(sizeof(Xfid*), 0);
cxfidfree = chancreate(sizeof(Xfid*), 0);
threadcreate(xfidallocthread, nil, STACK);
return cxfidalloc;
}
void
xfidctl(void *arg)
{
Xfid *x;
void (*f)(Xfid*);
x = arg;
threadsetname("xfid.%p", x);
for(;;){
f = recvp(x->c);
if(f){
x->flushtag = x->tag;
(*f)(x);
}
if(decref(x) == 0)
sendp(cxfidfree, x);
}
}
void
xfidflush(Xfid *x)
{
Fcall t;
Xfid *xf;
for(xf=xfid; xf; xf=xf->next)
if(xf->flushtag == x->oldtag){
incref(xf); /* to hold data structures up at tail of synchronization */
if(xf->ref == 1)
error("ref 1 in flush");
xf->flushtag = -1;
break;
}
/* take over flushtag so follow up flushes wait for us */
x->flushtag = x->oldtag;
/*
* wakeup filsysflush() in the filsysproc so the next
* flush can come in.
*/
sendul(x->fs->csyncflush, 0);
if(xf){
enum { Done, Flush, End };
Alt alts[End+1];
void *f;
int z;
z = 0;
f = nil;
alts[Done].c = xf->c;
alts[Done].v = &f;
alts[Done].op = CHANSND;
alts[Flush].c = xf->flushc;
alts[Flush].v = &z;
alts[Flush].op = CHANSND;
alts[End].op = CHANEND;
while(alt(alts) != Done)
;
}
if(nbrecv(x->flushc, nil)){
filsyscancel(x);
return;
}
filsysrespond(x->fs, x, &t, nil);
}
void
xfidattach(Xfid *x)
{
Fcall t;
int id, hideit, scrollit;
Window *w;
char *err, *n, *dir, errbuf[ERRMAX];
int pid, newlymade;
Rectangle r;
Image *i;
t.qid = x->f->qid;
qlock(&all);
w = nil;
err = Eunkid;
dir = nil;
newlymade = FALSE;
hideit = 0;
scrollit = scrolling;
if(x->aname[0] == 'N'){ /* N 100,100, 200, 200 - old syntax */
n = x->aname+1;
pid = strtoul(n, &n, 0);
if(*n == ',')
n++;
r.min.x = strtoul(n, &n, 0);
if(*n == ',')
n++;
r.min.y = strtoul(n, &n, 0);
if(*n == ',')
n++;
r.max.x = strtoul(n, &n, 0);
if(*n == ',')
n++;
r.max.y = strtoul(n, &n, 0);
Allocate:
if(!goodrect(r))
err = Ebadrect;
else{
if(hideit)
i = allocimage(display, r, screen->chan, 0, DNofill);
else
i = allocwindow(wscreen, r, Refbackup, DNofill);
if(i){
if(pid == 0)
pid = -1; /* make sure we don't pop a shell! - UGH */
w = new(i, hideit, scrollit, pid, dir, nil, nil);
newlymade = TRUE;
}else
err = Ewindow;
}
}else if(strncmp(x->aname, "new", 3) == 0){ /* new -dx -dy - new syntax, as in wctl */
pid = 0;
if(parsewctl(nil, ZR, &r, &pid, nil, &hideit, &scrollit, &dir, x->aname, errbuf) < 0)
err = errbuf;
else
goto Allocate;
}else{
id = atoi(x->aname);
w = wlookid(id);
}
x->f->w = w;
if(w == nil){
qunlock(&all);
x->f->busy = FALSE;
filsysrespond(x->fs, x, &t, err);
return;
}
if(!newlymade) /* counteract dec() in winshell() */
incref(w);
qunlock(&all);
filsysrespond(x->fs, x, &t, nil);
}
void
xfidopen(Xfid *x)
{
Fcall t;
Window *w;
w = x->f->w;
if(w->deleted){
filsysrespond(x->fs, x, &t, Edeleted);
return;
}
switch(FILE(x->f->qid)){
case Qtext:
if(x->mode&OTRUNC)
wsendctlmesg(w, Truncate, ZR, nil);
break;
case Qconsctl:
if(w->ctlopen){
filsysrespond(x->fs, x, &t, Einuse);
return;
}
w->ctlopen = TRUE;
break;
case Qkbd:
if(w->kbdopen){
filsysrespond(x->fs, x, &t, Einuse);
return;
}
w->kbdopen = TRUE;
break;
case Qmouse:
if(w->mouseopen){
filsysrespond(x->fs, x, &t, Einuse);
return;
}
/*
* Reshaped: there's a race if the appl. opens the
* window, is resized, and then opens the mouse,
* but that's rare. The alternative is to generate
* a resized event every time a new program starts
* up in a window that has been resized since the
* dawn of time. We choose the lesser evil.
*/
w->resized = FALSE;
w->mouseopen = TRUE;
break;
case Qsnarf:
if(x->mode==ORDWR || x->mode==OWRITE)
ntsnarf = 0;
break;
case Qwctl:
if(x->mode==OREAD || x->mode==ORDWR){
/*
* It would be much nicer to implement fan-out for wctl reads,
* so multiple people can see the resizings, but rio just isn't
* structured for that. It's structured for /dev/cons, which gives
* alternate data to alternate readers. So to keep things sane for
* wctl, we compromise and give an error if two people try to
* open it. Apologies.
*/
if(w->wctlopen){
filsysrespond(x->fs, x, &t, Einuse);
return;
}
w->wctlopen = TRUE;
w->wctlready = 1;
wsendctlmesg(w, Wakeup, ZR, nil);
}
break;
}
t.qid = x->f->qid;
t.iounit = messagesize-IOHDRSZ;
x->f->open = TRUE;
x->f->mode = x->mode;
filsysrespond(x->fs, x, &t, nil);
}
void
xfidclose(Xfid *x)
{
Fcall t;
Window *w;
int nb, nulls;
w = x->f->w;
switch(FILE(x->f->qid)){
case Qconsctl:
if(w->rawing){
w->rawing = FALSE;
wsendctlmesg(w, Rawoff, ZR, nil);
}
if(w->holding){
w->holding = FALSE;
wsendctlmesg(w, Holdoff, ZR, nil);
}
w->ctlopen = FALSE;
break;
case Qcursor:
w->cursorp = nil;
wsetcursor(w, FALSE);
break;
case Qkbd:
w->kbdopen = FALSE;
break;
case Qmouse:
w->resized = FALSE;
w->mouseopen = FALSE;
if(w->i != nil)
wsendctlmesg(w, Refresh, w->i->r, nil);
break;
/* odd behavior but really ok: replace snarf buffer when /dev/snarf is closed */
case Qsnarf:
if(x->f->mode==ORDWR || x->f->mode==OWRITE){
snarf = runerealloc(snarf, ntsnarf+1);
cvttorunes(tsnarf, ntsnarf, snarf, &nb, &nsnarf, &nulls);
ntsnarf = 0;
}
break;
case Qwctl:
if(x->f->mode==OREAD || x->f->mode==ORDWR)
w->wctlopen = FALSE;
break;
}
wclose(w);
filsysrespond(x->fs, x, &t, nil);
}
void
xfidwrite(Xfid *x)
{
Fcall fc;
int cnt, qid, nb, off, nr;
char err[ERRMAX], *p;
Point pt;
Window *w;
Rune *r;
Conswritemesg cwm;
Stringpair pair;
enum { CWdata, CWgone, CWflush, NCW };
Alt alts[NCW+1];
w = x->f->w;
if(w->deleted){
filsysrespond(x->fs, x, &fc, Edeleted);
return;
}
qid = FILE(x->f->qid);
cnt = x->count;
off = x->offset;
x->data[cnt] = 0;
switch(qid){
case Qcons:
case Qtext:
alts[CWdata].c = w->conswrite;
alts[CWdata].v = &cwm;
alts[CWdata].op = CHANRCV;
alts[CWgone].c = w->gone;
alts[CWgone].v = nil;
alts[CWgone].op = CHANRCV;
alts[CWflush].c = x->flushc;
alts[CWflush].v = nil;
alts[CWflush].op = CHANRCV;
alts[NCW].op = CHANEND;
switch(alt(alts)){
case CWdata:
break;
case CWgone:
filsysrespond(x->fs, x, &fc, Edeleted);
return;
case CWflush:
filsyscancel(x);
return;
}
nr = x->f->nrpart;
if(nr > 0){
memmove(x->data+nr, x->data, cnt); /* there's room: see malloc in filsysproc */
memmove(x->data, x->f->rpart, nr);
cnt += nr;
}
r = runemalloc(cnt);
if(r == nil){
pair.ns = 0;
send(cwm.cw, &pair);
filsysrespond(x->fs, x, &fc, Enomem);
return;
}
x->f->nrpart = 0;
cvttorunes(x->data, cnt-UTFmax, r, &nb, &nr, nil);
/* approach end of buffer */
while(fullrune(x->data+nb, cnt-nb)){
nb += chartorune(&r[nr], x->data+nb);
if(r[nr])
nr++;
}
if(nb < cnt){
memmove(x->f->rpart, x->data+nb, cnt-nb);
x->f->nrpart = cnt-nb;
}
pair.s = r;
pair.ns = nr;
send(cwm.cw, &pair);
fc.count = x->count;
filsysrespond(x->fs, x, &fc, nil);
return;
case Qconsctl:
if(strncmp(x->data, "holdon", 6)==0){
if(w->holding++ == 0)
wsendctlmesg(w, Holdon, ZR, nil);
break;
}
if(strncmp(x->data, "holdoff", 7)==0 && w->holding){
if(--w->holding == 0)
wsendctlmesg(w, Holdoff, ZR, nil);
break;
}
if(strncmp(x->data, "rawon", 5)==0){
if(w->holding){
w->holding = 0;
wsendctlmesg(w, Holdoff, ZR, nil);
}
if(w->rawing++ == 0)
wsendctlmesg(w, Rawon, ZR, nil);
break;
}
if(strncmp(x->data, "rawoff", 6)==0 && w->rawing){
if(--w->rawing == 0)
wsendctlmesg(w, Rawoff, ZR, nil);
break;
}
filsysrespond(x->fs, x, &fc, "unknown control message");
return;
case Qcursor:
if(cnt < 2*4+2*2*16)
w->cursorp = nil;
else{
w->cursor.offset.x = BGLONG(x->data+0*4);
w->cursor.offset.y = BGLONG(x->data+1*4);
memmove(w->cursor.clr, x->data+2*4, 2*2*16);
w->cursorp = &w->cursor;
}
wsetcursor(w, TRUE);
break;
case Qlabel:
if(off != 0){
filsysrespond(x->fs, x, &fc, "non-zero offset writing label");
return;
}
p = realloc(w->label, cnt+1);
if(p == nil){
filsysrespond(x->fs, x, &fc, Enomem);
return;
}
w->label = p;
w->label[cnt] = 0;
memmove(w->label, x->data, cnt);
break;
case Qmouse:
if(w!=input || Dx(w->screenr)<=0)
break;
if(x->data[0] != 'm'){
filsysrespond(x->fs, x, &fc, Ebadmouse);
return;
}
p = nil;
pt.x = strtoul(x->data+1, &p, 0);
if(p == nil){
filsysrespond(x->fs, x, &fc, Eshort);
return;
}
pt.y = strtoul(p, nil, 0);
if(w==input && wpointto(mouse->xy)==w)
wsendctlmesg(w, Movemouse, Rpt(pt, pt), nil);
break;
case Qsnarf:
if(cnt == 0)
break;
/* always append only */
if(ntsnarf > MAXSNARF){ /* avoid thrashing when people cut huge text */
filsysrespond(x->fs, x, &fc, Elong);
return;
}
p = realloc(tsnarf, ntsnarf+cnt+1); /* room for NUL */
if(p == nil){
filsysrespond(x->fs, x, &fc, Enomem);
return;
}
tsnarf = p;
memmove(tsnarf+ntsnarf, x->data, cnt);
ntsnarf += cnt;
snarfversion++;
break;
case Qwdir:
if(cnt == 0)
break;
if(x->data[cnt-1] == '\n'){
if(cnt == 1)
break;
x->data[cnt-1] = '\0';
}
/* assume data comes in a single write */
if(x->data[0] == '/'){
p = smprint("%.*s", cnt, x->data);
}else{
p = smprint("%s/%.*s", w->dir, cnt, x->data);
}
if(p == nil){
filsysrespond(x->fs, x, &fc, Enomem);
return;
}
free(w->dir);
w->dir = cleanname(p);
break;
case Qwctl:
if(writewctl(x, err) < 0){
filsysrespond(x->fs, x, &fc, err);
return;
}
break;
default:
fprint(2, "unknown qid %d in write\n", qid);
filsysrespond(x->fs, x, &fc, "unknown qid in write");
return;
}
fc.count = cnt;
filsysrespond(x->fs, x, &fc, nil);
}
int
readwindow(Image *i, char *t, Rectangle r, int offset, int n)
{
int ww, oo, y, m;
uchar *tt;
ww = bytesperline(r, i->depth);
r.min.y += offset/ww;
if(r.min.y >= r.max.y)
return 0;
y = r.min.y + (n + ww-1)/ww;
if(y < r.max.y)
r.max.y = y;
m = ww * Dy(r);
oo = offset % ww;
if(oo == 0 && n >= m)
return unloadimage(i, r, (uchar*)t, n);
if((tt = malloc(m)) == nil)
return -1;
m = unloadimage(i, r, tt, m) - oo;
if(m > 0){
if(n < m) m = n;
memmove(t, tt + oo, m);
}
free(tt);
return m;
}
void
xfidread(Xfid *x)
{
Fcall fc;
int n, off, cnt, c;
uint qid;
char buf[128], *t;
char cbuf[30];
Window *w;
Mouse ms;
Rectangle r;
Image *i;
Channel *c1, *c2; /* chan (tuple(char*, int)) */
Consreadmesg crm;
Mousereadmesg mrm;
Stringpair pair;
enum { Adata, Agone, Aflush, Aend };
Alt alts[Aend+1];
w = x->f->w;
if(w->deleted){
filsysrespond(x->fs, x, &fc, Edeleted);
return;
}
qid = FILE(x->f->qid);
off = x->offset;
cnt = x->count;
switch(qid){
case Qwctl:
if(cnt < 4*12){
filsysrespond(x->fs, x, &fc, Etooshort);
return;
}
alts[Adata].c = w->wctlread;
goto Consmesg;
case Qkbd:
alts[Adata].c = w->kbdread;
goto Consmesg;
case Qcons:
alts[Adata].c = w->consread;
Consmesg:
alts[Adata].v = &crm;
alts[Adata].op = CHANRCV;
alts[Agone].c = w->gone;
alts[Agone].v = nil;
alts[Agone].op = CHANRCV;
alts[Aflush].c = x->flushc;
alts[Aflush].v = nil;
alts[Aflush].op = CHANRCV;
alts[Aend].op = CHANEND;
switch(alt(alts)){
case Adata:
break;
case Agone:
filsysrespond(x->fs, x, &fc, Edeleted);
return;
case Aflush:
filsyscancel(x);
return;
}
c1 = crm.c1;
c2 = crm.c2;
t = emalloc(cnt+UTFmax+1); /* room to unpack partial rune plus */
pair.s = t;
pair.ns = cnt;
send(c1, &pair);
recv(c2, &pair);
fc.data = pair.s;
fc.count = min(cnt, pair.ns);
filsysrespond(x->fs, x, &fc, nil);
free(t);
break;
case Qlabel:
n = strlen(w->label);
if(off > n)
off = n;
if(off+cnt > n)
cnt = n-off;
fc.data = w->label+off;
fc.count = cnt;
filsysrespond(x->fs, x, &fc, nil);
break;
case Qmouse:
alts[Adata].c = w->mouseread;
alts[Adata].v = &mrm;
alts[Adata].op = CHANRCV;
alts[Agone].c = w->gone;
alts[Agone].v = nil;
alts[Agone].op = CHANRCV;
alts[Aflush].c = x->flushc;
alts[Aflush].v = nil;
alts[Aflush].op = CHANRCV;
alts[Aend].op = CHANEND;
switch(alt(alts)){
case Adata:
break;
case Agone:
filsysrespond(x->fs, x, &fc, Edeleted);
return;
case Aflush:
filsyscancel(x);
return;
}
recv(mrm.cm, &ms);
c = 'm';
if(w->resized)
c = 'r';
n = sprint(buf, "%c%11d %11d %11d %11ld ", c, ms.xy.x, ms.xy.y, ms.buttons, ms.msec);
w->resized = 0;
fc.data = buf;
fc.count = min(n, cnt);
filsysrespond(x->fs, x, &fc, nil);
break;
case Qcursor:
filsysrespond(x->fs, x, &fc, "cursor read not implemented");
break;
/* The algorithm for snarf and text is expensive but easy and rarely used */
case Qsnarf:
getsnarf();
if(nsnarf)
t = runetobyte(snarf, nsnarf, &n);
else {
t = nil;
n = 0;
}
goto Text;
case Qtext:
t = wcontents(w, &n);
goto Text;
Text:
if(off > n){
off = n;
cnt = 0;
}
if(off+cnt > n)
cnt = n-off;
fc.data = t+off;
fc.count = cnt;
filsysrespond(x->fs, x, &fc, nil);
free(t);
break;
case Qwdir:
t = estrdup(w->dir);
n = strlen(t);
goto Text;
case Qwinid:
n = sprint(buf, "%11d ", w->id);
t = estrdup(buf);
goto Text;
case Qwinname:
n = strlen(w->name);
if(n == 0){
filsysrespond(x->fs, x, &fc, "window has no name");
break;
}
t = estrdup(w->name);
goto Text;
case Qwindow:
i = w->i;
if(i == nil){
filsysrespond(x->fs, x, &fc, Enowindow);
return;
}
r = i->r;
goto caseImage;
case Qscreen:
i = screen;
r = screen->r;
caseImage:
if(off < 5*12){
n = sprint(buf, "%11s %11d %11d %11d %11d ",
chantostr(cbuf, i->chan),
r.min.x, r.min.y, r.max.x, r.max.y);
t = estrdup(buf);
goto Text;
}
off -= 5*12;
n = -1;
t = malloc(cnt);
if(t){
fc.data = t;
n = readwindow(i, t, r, off, cnt); /* careful; fc.count is unsigned */
}
if(n < 0){
buf[0] = 0;
errstr(buf, sizeof buf);
filsysrespond(x->fs, x, &fc, buf);
}else{
fc.count = n;
filsysrespond(x->fs, x, &fc, nil);
}
free(t);
return;
default:
fprint(2, "unknown qid %d in read\n", qid);
snprint(buf, sizeof(buf), "unknown qid in read");
filsysrespond(x->fs, x, &fc, buf);
break;
}
}