ref: 60c34ebb2da2b9716169ae4e6db4816d02c28910
dir: /acme/bin/source/win/main.c/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <thread.h>
#include <fcall.h>
#include <9p.h>
#include <ctype.h>
#include "dat.h"
void mainctl(void*);
int debug;
int eraseinput;
int notepg = -1;
int dirty = 0;
char *wdir;
char *wname;
Window *win; /* the main window */
void
usage(void)
{
fprint(2, "usage: %s [-Dde] [windowname]\n", argv0);
threadexitsall("usage");
}
void
threadmain(int argc, char *argv[])
{
char buf[1024], *s;
quotefmtinstall();
ARGBEGIN{
case 'd':
debug = 1;
chatty9p++;
break;
case 'e':
eraseinput = 1;
break;
case 'D':
{extern int _threaddebuglevel;
_threaddebuglevel = 1<<20;
}
}ARGEND
if(argc == 0)
wname = argv0;
else
wname = argv[0];
s = utfrrune(wname, '/');
if(s != nil)
wname = s+1;
if(getwd(buf, sizeof buf) == 0)
wdir = "/";
else
wdir = buf;
wdir = estrdup(wdir);
win = newwindow();
winsetdir(win, wdir, wname);
wintagwrite(win, "Send Noscroll", 5+8);
ctlprint(win->ctl, "scroll");
snprint(buf, sizeof(buf), "/proc/%d/notepg", getpid());
notepg = open(buf, OWRITE);
mountcons(win);
snprint(buf, sizeof buf, "%d", win->id);
putenv("winid", buf);
snprint(buf, sizeof(buf), "/mnt/wsys/%d", win->id);
bind(buf, "/dev/acme", MREPL);
bind("/dev/acme/body", "/dev/text", MREPL);
threadexits(nil);
}
int
EQUAL(char *s, char *t)
{
while(tolower(*s) == tolower(*t++))
if(*s++ == '\0')
return 1;
return 0;
}
int
command(Window *w, char *s)
{
while(*s==' ' || *s=='\t' || *s=='\n')
s++;
if(strcmp(s, "Delete")==0 || strcmp(s, "Del")==0){
windel(w, 1);
threadexitsall(nil);
return 1;
}
if(EQUAL(s, "scroll")){
ctlprint(w->ctl, "scroll\nshow");
return 1;
}
if(EQUAL(s, "noscroll")){
ctlprint(w->ctl, "noscroll");
return 1;
}
return 0;
}
static long
utfncpy(char *to, char *from, int n)
{
char *end, *e;
e = to+n;
if(to >= e)
return 0;
end = memccpy(to, from, '\0', e - to);
if(end == nil){
end = e;
if(end[-1]&0x80){
if(end-2>=to && (end[-2]&0xE0)==0xC0)
return end-to;
if(end-3>=to && (end[-3]&0xF0)==0xE0)
return end-to;
while(end>to && (*--end&0xC0)==0x80)
;
}
}else
end--;
return end - to;
}
/* sendinput and fsloop run in the same proc (can't interrupt each other). */
static Req *q;
static Req **eq;
static int
__sendinput(Window *w, ulong q0, ulong q1)
{
char *s, *t;
int n, nb, eofchar;
static int partial;
static char tmp[UTFmax];
Req *r;
Rune rune;
if(!q)
return 0;
r = q;
n = 0;
if(partial){
Partial:
nb = partial;
if(nb > r->ifcall.count)
nb = r->ifcall.count;
memmove(r->ofcall.data, tmp, nb);
if(nb!=partial)
memmove(tmp, tmp+nb, partial-nb);
partial -= nb;
q = r->aux;
if(q == nil)
eq = &q;
r->aux = nil;
r->ofcall.count = nb;
if(debug)
fprint(2, "satisfy read with partial\n");
respond(r, nil);
return n;
}
if(q0==q1)
return 0;
s = emalloc((q1-q0)*UTFmax+1);
n = winread(w, q0, q1, s);
s[n] = '\0';
t = strpbrk(s, "\n\004");
if(t == nil){
free(s);
return 0;
}
r = q;
eofchar = 0;
if(*t == '\004'){
eofchar = 1;
*t = '\0';
}else
*++t = '\0';
nb = utfncpy((char*)r->ofcall.data, s, r->ifcall.count);
if(nb==0 && s<t && r->ifcall.count > 0){
partial = utfncpy(tmp, s, UTFmax);
assert(partial > 0);
chartorune(&rune, tmp);
partial = runelen(rune);
free(s);
n = 1;
goto Partial;
}
n = utfnlen(r->ofcall.data, nb);
if(nb==strlen(s) && eofchar)
n++;
r->ofcall.count = nb;
q = r->aux;
if(q == nil)
eq = &q;
r->aux = nil;
if(debug)
fprint(2, "read returns %lud-%lud: %.*q\n", q0, q0+n, n, r->ofcall.data);
respond(r, nil);
return n;
}
static int
_sendinput(Window *w, ulong q0, ulong *q1)
{
char buf[32];
int n;
n = __sendinput(w, q0, *q1);
if(!n || !eraseinput)
return n;
/* erase q0 to q0+n */
snprint(buf, sizeof(buf), "#%lud,#%lud", q0, q0+n);
winsetaddr(w, buf, 0);
write(w->data, buf, 0);
*q1 -= n;
return 0;
}
int
sendinput(Window *w, ulong q0, ulong *q1)
{
ulong n;
Req *oq;
n = 0;
do {
oq = q;
n += _sendinput(w, q0+n, q1);
} while(q != oq);
return n;
}
Event esendinput;
void
fsloop(void *arg)
{
Fsevent e;
Req **l, *r;
Window *w = arg; /* the main window */
threadcreate(mainctl, w, STACK);
startpipe();
eq = &q;
memset(&esendinput, 0, sizeof esendinput);
esendinput.c1 = 'C';
for(;;){
while(recv(fschan, &e) == -1)
;
r = e.r;
switch(e.type){
case 'r':
*eq = r;
r->aux = nil;
eq = &r->aux;
/* call sendinput with hostpt and endpt */
sendp(win->cevent, &esendinput);
break;
case 'f':
for(l=&q; *l; l=&(*l)->aux){
if(*l == r->oldreq){
*l = (*l)->aux;
if(*l == nil)
eq = l;
respond(r->oldreq, "interrupted");
break;
}
}
respond(r, nil);
break;
}
}
}
void
sendit(char *s)
{
// char tmp[32];
write(win->body, s, strlen(s));
/*
* RSC: The problem here is that other procs can call sendit,
* so we lose our single-threadedness if we call sendinput.
* In fact, we don't even have the right queue memory,
* I think that we'll get a write event from the body write above,
* and we can do the sendinput then, from our single thread.
*
* I still need to figure out how to test this assertion for
* programs that use /srv/win*
*
winselect(win, "$", 0);
seek(win->addr, 0UL, 0);
if(read(win->addr, tmp, 2*12) == 2*12)
hostpt += sendinput(win, hostpt, atol(tmp), );
*/
}
void
execevent(Window *w, Event *e, int (*command)(Window*, char*))
{
Event *ea, *e2;
int n, na, len, needfree;
char *s, *t;
ea = nil;
e2 = nil;
if(e->flag & 2)
e2 = recvp(w->cevent);
if(e->flag & 8){
ea = recvp(w->cevent);
na = ea->nb;
recvp(w->cevent);
}else
na = 0;
needfree = 0;
s = e->b;
if(e->nb==0 && (e->flag&2)){
s = e2->b;
e->q0 = e2->q0;
e->q1 = e2->q1;
e->nb = e2->nb;
}
if(e->nb==0 && e->q0<e->q1){
/* fetch data from window */
s = emalloc((e->q1-e->q0)*UTFmax+2);
n = winread(w, e->q0, e->q1, s);
s[n] = '\0';
needfree = 1;
}else
if(na){
t = emalloc(strlen(s)+1+na+2);
sprint(t, "%s %s", s, ea->b);
if(needfree)
free(s);
s = t;
needfree = 1;
}
/* if it's a known command, do it */
/* if it's a long message, it can't be for us anyway */
if(!command(w, s) && s[0]!='\0'){ /* send it as typed text */
/* if it's a built-in from the tag, send it back */
if(e->flag & 1)
fprint(w->event, "%c%c%d %d\n", e->c1, e->c2, e->q0, e->q1);
else{ /* send text to main window */
len = strlen(s);
if(len>0 && s[len-1]!='\n' && s[len-1]!='\004'){
if(!needfree){
/* if(needfree), we left room for a newline before */
t = emalloc(len+2);
strcpy(t, s);
s = t;
needfree = 1;
}
s[len++] = '\n';
s[len] = '\0';
}
sendit(s);
}
}
if(needfree)
free(s);
}
int
hasboundary(Rune *r, int nr)
{
int i;
for(i=0; i<nr; i++)
if(r[i]=='\n' || r[i]=='\004')
return 1;
return 0;
}
void
mainctl(void *v)
{
Window *w;
Event *e;
int delta, pendingS, pendingK;
ulong hostpt, endpt;
char tmp[32];
w = v;
proccreate(wineventproc, w, STACK);
hostpt = 0;
endpt = 0;
winsetaddr(w, "0", 0);
pendingS = 0;
pendingK = 0;
for(;;){
if(debug)
fprint(2, "input range %lud-%lud\n", hostpt, endpt);
e = recvp(w->cevent);
if(debug)
fprint(2, "msg: %C %C %d %d %d %d %q\n",
e->c1 ? e->c1 : ' ', e->c2 ? e->c2 : ' ', e->q0, e->q1, e->flag, e->nb, e->b);
switch(e->c1){
default:
Unknown:
fprint(2, "unknown message %c%c\n", e->c1, e->c2);
break;
case 'C': /* input needed for /dev/cons */
if(pendingS)
pendingK = 1;
else
hostpt += sendinput(w, hostpt, &endpt);
break;
case 'S': /* output to stdout */
sprint(tmp, "#%lud", hostpt);
winsetaddr(w, tmp, 0);
write(w->data, e->b, e->nb);
pendingS += e->nr;
break;
case 'E': /* write to tag or body; body happens due to sendit */
delta = e->q1-e->q0;
if(e->c2=='I'){
endpt += delta;
if(e->q0 < hostpt)
hostpt += delta;
else
hostpt += sendinput(w, hostpt, &endpt);
break;
}
if(!islower(e->c2))
fprint(2, "win msg: %C %C %d %d %d %d %q\n",
e->c1, e->c2, e->q0, e->q1, e->flag, e->nb, e->b);
break;
case 'F': /* generated by our actions (specifically case 'S' above) */
delta = e->q1-e->q0;
if(e->c2=='D'){
/* we know about the delete by _sendinput */
break;
}
if(e->c2=='I'){
pendingS -= e->q1 - e->q0;
if(pendingS < 0)
fprint(2, "win: pendingS = %d\n", pendingS);
if(e->q0 != hostpt)
fprint(2, "win: insert at %d expected %lud\n", e->q0, hostpt);
endpt += delta;
hostpt += delta;
sendp(writechan, nil);
if(pendingS == 0 && pendingK){
pendingK = 0;
hostpt += sendinput(w, hostpt, &endpt);
}
break;
}
if(!islower(e->c2))
fprint(2, "win msg: %C %C %d %d %d %d %q\n",
e->c1, e->c2, e->q0, e->q1, e->flag, e->nb, e->b);
break;
case 'K':
delta = e->q1-e->q0;
switch(e->c2){
case 'D':
endpt -= delta;
if(e->q1 < hostpt)
hostpt -= delta;
else if(e->q0 < hostpt)
hostpt = e->q0;
break;
case 'I':
delta = e->q1 - e->q0;
endpt += delta;
if(endpt < e->q1) /* just in case */
endpt = e->q1;
if(e->q0 < hostpt)
hostpt += delta;
if(e->nr>0 && e->r[e->nr-1]==0x7F){
write(notepg, "interrupt", 9);
hostpt = endpt;
break;
}
if(e->q0 >= hostpt
&& hasboundary(e->r, e->nr)){
/*
* If we are between the S message (which
* we processed by inserting text in the
* window) and the F message notifying us
* that the text has been inserted, then our
* impression of the hostpt and acme's
* may be different. This could be seen if you
* hit enter a bunch of times in a con
* session. To work around the unreliability,
* only send input if we don't have an S pending.
* The same race occurs between when a character
* is typed and when we get notice of it, but
* since characters tend to be typed at the end
* of the buffer, we don't run into it. There's
* no workaround possible for this typing race,
* since we can't tell when the user has typed
* something but we just haven't been notified.
*/
if(pendingS)
pendingK = 1;
else
hostpt += sendinput(w, hostpt, &endpt);
}
break;
}
break;
case 'M': /* mouse */
delta = e->q1-e->q0;
switch(e->c2){
case 'x':
case 'X':
execevent(w, e, command);
break;
case 'l': /* reflect all searches back to acme */
case 'L':
if(e->flag & 2)
recvp(w->cevent);
winwriteevent(w, e);
break;
case 'I':
endpt += delta;
if(e->q0 < hostpt)
hostpt += delta;
else
hostpt += sendinput(w, hostpt, &endpt);
break;
case 'D':
endpt -= delta;
if(e->q1 < hostpt)
hostpt -= delta;
else if(e->q0 < hostpt)
hostpt = e->q0;
break;
case 'd': /* modify away; we don't care */
case 'i':
break;
default:
goto Unknown;
}
}
}
}