harden ipc and frontend recovery

strans.c

@@ -308,14 +308,24 @@ init(void)
 	im.l = getlang(LangEN);
 }
 
+static void
+imhandlekey(Keyreq *kr)
+{
+	Keyres res;
+
+	sclear(&res.commit);
+	sclear(&res.preedit);
+	res.eaten = keystroke(kr->ks, kr->mod, &res.commit);
+	if(kr->want)
+		res.preedit = im.pre;
+	chansend(kr->reply, &res);
+}
+
 void
 imthread(void*)
 {
 	Keyreq kr;
 	Dictres res;
-	Str com;
-	uchar out[256];
-	int n, len, r;
 	Alt alts[] = {
 		{keyc, &kr, CHANRCV, nil},
 		{dictresc, &res, CHANRCV, nil},
@@ -327,24 +337,7 @@ imthread(void*)
 	for(;;){
 		switch(alt(alts)){
 		case 0:
-			sclear(&com);
-			r = keystroke(kr.ks, kr.mod, &com);
-			out[0] = r;
-			out[1] = 0;
-			n = 2;
-			if(com.n > 0){
-				len = stoutf(&com, (char*)(out+2), sizeof(out)-2);
-				out[1] = len;
-				n += len;
-			}
-			if(kr.want){
-				len = im.pre.n > 0 ?
-					stoutf(&im.pre, (char*)(out+n+1),
-						sizeof(out)-n-1) : 0;
-				out[n] = len;
-				n += 1 + len;
-			}
-			write(kr.fd, out, n);
+			imhandlekey(&kr);
 			break;
 		case 1:
 			if(scmp(&res.key, &im.pre) == 0){
@@ -385,4 +378,3 @@ mapinit(char *dir)
 		langs[i].map = trieopen(path);
 	}
 }
-