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prevent blank messages being sent.

this would be handled by the condition of the while loop
however if the input window only contains newlines and EOT chars,
the filtered message would be empty so the case must be handled explicitly.

--- a/main.c

+++ b/main.c

@@ -143,7 +143,15 @@

 	 * hopefully nobody needs a message that large */

 	fprint(win->addrfd, ",");

 	while((n = read(win->datafd, buf, sizeof(buf)-1)) > 0) {

-		buf[n] = '\0'; filter(buf); /* null terminate and filter */

+

+		/* null terminate and filter */

+		buf[n] = '\0'; 

+		filter(buf); 

+

+		/* no blank messages */

+		if(buf[0] == 0)

+			return;

+

 		fprint(fd, "%s %s\n", prefix, buf);

 	};