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WebSVN – planix.SVN – Blame – /os/branches/feature_posix/sys/src/libdraw/mouse.c – Rev 2

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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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#include <thread.h>
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#include <cursor.h>
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#include <mouse.h>
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void
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moveto(Mousectl *m, Point pt)
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{
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	fprint(m->mfd, "m%d %d", pt.x, pt.y);
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	m->xy = pt;
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}
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void
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closemouse(Mousectl *mc)
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{
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	if(mc == nil)
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		return;
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	postnote(PNPROC, mc->pid, "kill");
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	do; while(nbrecv(mc->c, &mc->Mouse) > 0);
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	close(mc->mfd);
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	close(mc->cfd);
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	free(mc->file);
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	free(mc->c);
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	free(mc->resizec);
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	free(mc);
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}
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int
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readmouse(Mousectl *mc)
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{
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	if(mc->image)
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		flushimage(mc->image->display, 1);
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	if(recv(mc->c, &mc->Mouse) < 0){
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		fprint(2, "readmouse: %r\n");
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		return -1;
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	}
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	return 0;
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}
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static
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void
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_ioproc(void *arg)
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{
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	int n, nerr, one;
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	char buf[1+5*12];
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	Mouse m;
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	Mousectl *mc;
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	mc = arg;
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	threadsetname("mouseproc");
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	one = 1;
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	memset(&m, 0, sizeof m);
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	mc->pid = getpid();
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	nerr = 0;
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	for(;;){
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		n = read(mc->mfd, buf, sizeof buf);
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		if(n != 1+4*12){
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			yield();	/* if error is due to exiting, we'll exit here */
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			fprint(2, "mouse: bad count %d not 49: %r\n", n);
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			if(n<0 || ++nerr>10)
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				threadexits("read error");
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			continue;
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		}
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		nerr = 0;
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		switch(buf[0]){
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		case 'r':
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			send(mc->resizec, &one);
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			/* fall through */
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		case 'm':
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			m.xy.x = atoi(buf+1+0*12);
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			m.xy.y = atoi(buf+1+1*12);
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			m.buttons = atoi(buf+1+2*12);
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			m.msec = atoi(buf+1+3*12);
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			send(mc->c, &m);
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			/*
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			 * mc->Mouse is updated after send so it doesn't have wrong value if we block during send.
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			 * This means that programs should receive into mc->Mouse (see readmouse() above) if
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			 * they want full synchrony.
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			 */
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			mc->Mouse = m;
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			break;
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		}
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	}
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}
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Mousectl*
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initmouse(char *file, Image *i)
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{
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	Mousectl *mc;
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	char *t, *sl;
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	mc = mallocz(sizeof(Mousectl), 1);
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	if(file == nil)
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		file = "/dev/mouse";
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	mc->file = strdup(file);
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	mc->mfd = open(file, ORDWR|OCEXEC);
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	if(mc->mfd<0 && strcmp(file, "/dev/mouse")==0){
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		bind("#m", "/dev", MAFTER);
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		mc->mfd = open(file, ORDWR|OCEXEC);
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	}
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	if(mc->mfd < 0){
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		free(mc);
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		return nil;
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	}
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	t = malloc(strlen(file)+16);
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	if (t == nil) {
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		close(mc->mfd);
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		free(mc);
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		return nil;
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	}
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	strcpy(t, file);
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	sl = utfrrune(t, '/');
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	if(sl)
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		strcpy(sl, "/cursor");
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	else
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		strcpy(t, "/dev/cursor");
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	mc->cfd = open(t, ORDWR|OCEXEC);
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	free(t);
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	mc->image = i;
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	mc->c = chancreate(sizeof(Mouse), 0);
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	mc->resizec = chancreate(sizeof(int), 2);
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	proccreate(_ioproc, mc, 4096);
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	return mc;
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}
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131 
void
132 
setcursor(Mousectl *mc, Cursor *c)
133 
{
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	char curs[2*4+2*2*16];
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136 
	if(c == nil)
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		write(mc->cfd, curs, 0);
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	else{
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		BPLONG(curs+0*4, c->offset.x);
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		BPLONG(curs+1*4, c->offset.y);
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		memmove(curs+2*4, c->clr, 2*2*16);
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		write(mc->cfd, curs, sizeof curs);
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	}
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}