ref: 9c0a6bb7ee2543794594f3a678f58aa4c702c011
dir: ham/samterm/plan9.c
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <thread.h>
#include <mouse.h>
#include <keyboard.h>
#include <frame.h>
#include <plumb.h>
#include "flayer.h"
#include "samterm.h"
enum {
STACK = 4096,
};
static char exname[64];
void
usage(void)
{
fprint(2, "usage: samterm [-ai]\n");
threadexitsall("usage");
}
void
getscreen(int argc, char **argv)
{
char *t;
ARGBEGIN{
case 'a':
autoindent = 1;
break;
case 'i':
spacesindent = 1;
break;
default:
usage();
}ARGEND
if(initdraw(panic1, nil, "sam") < 0){
fprint(2, "samterm: initdraw: %r\n");
threadexitsall("init");
}
t = getenv("tabstop");
if(t != nil)
maxtab = strtoul(t, nil, 0);
free(t);
draw(screen, screen->clipr, display->white, nil, ZP);
}
int
screensize(int *w, int *h)
{
int fd, n;
char buf[5*12+1];
fd = open("/dev/screen", OREAD);
if(fd < 0)
return 0;
n = read(fd, buf, sizeof(buf)-1);
close(fd);
if (n != sizeof(buf)-1)
return 0;
buf[n] = 0;
if (h) {
*h = atoi(buf+4*12)-atoi(buf+2*12);
if (*h < 0)
return 0;
}
if (w) {
*w = atoi(buf+3*12)-atoi(buf+1*12);
if (*w < 0)
return 0;
}
return 1;
}
int
snarfswap(char *fromsam, int nc, char **tosam)
{
char *s1;
int f, n, ss;
f = open("/dev/snarf", 0);
if(f < 0)
return -1;
ss = SNARFSIZE;
if(hversion < 2)
ss = 4096;
*tosam = s1 = alloc(ss);
n = read(f, s1, ss-1);
close(f);
if(n < 0)
n = 0;
if (n == 0) {
*tosam = 0;
free(s1);
} else
s1[n] = 0;
f = create("/dev/snarf", 1, 0666);
if(f >= 0){
write(f, fromsam, nc);
close(f);
}
return n;
}
void
dumperrmsg(int count, int type, int count0, int c)
{
fprint(2, "samterm: host mesg: count %d %ux %ux %ux %s...ignored\n",
count, type, count0, c, rcvstring());
}
void
removeextern(void)
{
remove(exname);
}
Readbuf hostbuf[2];
Readbuf plumbbuf[2];
void
extproc(void *argv)
{
Channel *c;
int i, n, which, *fdp;
void **arg;
arg = argv;
c = arg[0];
fdp = arg[1];
i = 0;
for(;;){
i = 1-i; /* toggle */
n = read(*fdp, plumbbuf[i].data, sizeof plumbbuf[i].data);
if(n <= 0){
fprint(2, "samterm: extern read error: %r\n");
threadexits("extern"); /* not a fatal error */
}
plumbbuf[i].n = n;
which = i;
send(c, &which);
}
}
void
extstart(void)
{
char buf[32];
int fd;
static int p[2];
static void *arg[2];
if(pipe(p) < 0)
return;
sprint(exname, "/srv/sam.%s", getuser());
fd = create(exname, 1, 0600);
if(fd < 0){ /* assume existing guy is more important */
Err:
close(p[0]);
close(p[1]);
return;
}
sprint(buf, "%d", p[0]);
if(write(fd, buf, strlen(buf)) <= 0)
goto Err;
close(fd);
/*
* leave p[0] open so if the file is removed the event
* library won't get an error
*/
plumbc = chancreate(sizeof(int), 0);
arg[0] = plumbc;
arg[1] = &p[1];
proccreate(extproc, arg, STACK);
atexit(removeextern);
}
int
plumbformat(int i)
{
Plumbmsg *m;
char *addr, *data, *act;
int n;
data = (char*)plumbbuf[i].data;
m = plumbunpack(data, plumbbuf[i].n);
if(m == nil)
return 0;
n = m->ndata;
if(n == 0){
plumbfree(m);
return 0;
}
act = plumblookup(m->attr, "action");
if(act!=nil && strcmp(act, "showfile")!=0){
/* can't handle other cases yet */
plumbfree(m);
return 0;
}
addr = plumblookup(m->attr, "addr");
if(addr){
if(addr[0] == '\0')
addr = nil;
else
addr = strdup(addr); /* copy to safe storage; we'll overwrite data */
}
memmove(data, "B ", 2); /* we know there's enough room for this */
memmove(data+2, m->data, n);
n += 2;
if(data[n-1] != '\n')
data[n++] = '\n';
if(addr != nil){
if(n+strlen(addr)+1+1 <= READBUFSIZE)
n += sprint(data+n, "%s\n", addr);
free(addr);
}
plumbbuf[i].n = n;
plumbfree(m);
return 1;
}
void
plumbproc(void *argv)
{
Channel *c;
int i, n, which, *fdp;
void **arg;
arg = argv;
c = arg[0];
fdp = arg[1];
i = 0;
for(;;){
i = 1-i; /* toggle */
n = read(*fdp, plumbbuf[i].data, READBUFSIZE);
if(n <= 0){
fprint(2, "samterm: plumb read error: %r\n");
threadexits("plumb"); /* not a fatal error */
}
plumbbuf[i].n = n;
if(plumbformat(i)){
which = i;
send(c, &which);
}
}
}
int
plumbstart(void)
{
static int fd;
static void *arg[2];
plumbfd = plumbopen("send", OWRITE|OCEXEC); /* not open is ok */
fd = plumbopen("edit", OREAD|OCEXEC);
if(fd < 0)
return -1;
plumbc = chancreate(sizeof(int), 0);
if(plumbc == nil){
close(fd);
return -1;
}
arg[0] =plumbc;
arg[1] = &fd;
proccreate(plumbproc, arg, STACK);
return 1;
}
void
hostproc(void *arg)
{
Channel *c;
int i, n, which;
c = arg;
i = 0;
for(;;){
i = 1-i; /* toggle */
n = read(0, hostbuf[i].data, sizeof hostbuf[i].data);
if(n <= 0){
if(n==0){
if(exiting)
threadexits(nil);
werrstr("unexpected eof");
}
fprint(2, "samterm: host read error: %r\n");
threadexitsall("host");
}
hostbuf[i].n = n;
which = i;
send(c, &which);
}
}
void
hoststart(void)
{
hostc = chancreate(sizeof(int), 0);
proccreate(hostproc, hostc, STACK);
}