try for utf8 string first in getsnarf; new test program snarf

src/cmd/devdraw/snarf.c

@@ -0,0 +1,110 @@
+#include <u.h>
+#include <sys/select.h>
+#include <errno.h>
+#include "x11-inc.h"
+#include <libc.h>
+#include <draw.h>
+#include <memdraw.h>
+#include <memlayer.h>
+#include <keyboard.h>
+#include <mouse.h>
+#include <cursor.h>
+#include <drawfcall.h>
+#include "x11-memdraw.h"
+#include "devdraw.h"
+
+#undef time
+
+#define MouseMask (\
+	ButtonPressMask|\
+	ButtonReleaseMask|\
+	PointerMotionMask|\
+	Button1MotionMask|\
+	Button2MotionMask|\
+	Button3MotionMask)
+
+#define Mask MouseMask|ExposureMask|StructureNotifyMask|KeyPressMask|EnterWindowMask|LeaveWindowMask
+
+void runxevent(XEvent*);
+
+void
+usage(void)
+{
+	fprint(2, "usage: snarf [-a] [-o | text]\n");
+	exits("usage");
+}
+
+void
+main(int argc, char **argv)
+{
+	int apple;
+	int out;
+
+	apple = 0;
+	out = 0;
+
+	ARGBEGIN{
+	case 'a':
+		apple = 1;
+		break;
+	case 'o':
+		out = 1;
+		break;
+	default:
+		usage();
+	}ARGEND
+
+	if(out && argc != 0)
+		usage();
+	if(!out && argc != 1)
+		usage();
+
+	_x.fd = -1;
+
+	memimageinit();
+	_xattach("snarf", "20x20");
+
+	XSelectInput(_x.display, _x.drawable, Mask);
+	XFlush(_x.display);
+
+	if(out){
+		char *s;
+		if(apple)
+			s = _applegetsnarf();
+		else
+			s = _xgetsnarf();
+		write(1, s, strlen(s));
+		write(1, "\n", 1);
+		exits(0);
+	}else{
+		_xputsnarf(argv[0]);
+		for(;;){
+			XEvent event;
+			XNextEvent(_x.display, &event);
+			runxevent(&event);
+		}
+	}
+}
+
+/*
+ * Handle an incoming X event.
+ */
+void
+runxevent(XEvent *xev)
+{
+	switch(xev->type){
+	case Expose:
+		_xexpose(xev);
+		break;
+	
+	case DestroyNotify:
+		if(_xdestroy(xev))
+			exits(0);
+		break;
+
+	case SelectionRequest:
+		_xselect(xev);
+		break;
+	}
+}
+