fix vietnamese telex state

strans.c

@@ -17,7 +17,7 @@ Lang langs[] = {
 	{LangJPK,   "kata",    "kanji",  transmap, backmap, dictqmap, nil, nil},
 	{LangKO,    "hangul",  nil,      transko,  backko,  dictqmap, nil, nil},
 	{LangEMOJI, "emoji",   "emoji",  transmap, backmap, dictqmap, nil, nil},
-//	{LangVI,    "telex",   nil,      transvi,  backmap, dictqmap, nil, nil},
+	{LangVI,    "telex",   nil,      transvi,  backvi,  dictqmap, nil, nil},
 };
 int nlang = nelem(langs);
 
@@ -65,6 +65,7 @@ static void
 reset(void)
 {
 	sclear(&im.pre);
+	sclear(&im.raw);
 	clearkouho();
 	show();
 }
@@ -115,6 +116,7 @@ commit(Str *com)
 	else
 		sappend(com, &im.pre);
 	sclear(&im.pre);
+	sclear(&im.raw);
 }
 
 static int
@@ -122,8 +124,24 @@ dotrans(Rune c, Str *com)
 {
 	Emit e;
 	Dictreq req;
+	Str mapped;
 
 	e = im.l->trans(&im, c);
+	if(im.l->lang == LangVI){
+		if(e.s.n > 0 || !e.eat)
+			sclear(&im.raw);
+		if(e.eat && e.next.n > 0){
+			if(im.raw.n >= Maxrunes){
+				if(!mapget(im.l->map, &e.next, &mapped))
+					mapped = e.next;
+				sappend(com, &mapped);
+				reset();
+				return e.eat;
+			}
+			sputr(&im.raw, c);
+		}
+	}
+	clearkouho();
 	if(e.s.n > 0)
 		sappend(com, &e.s);
 	sclear(&im.pre);
@@ -151,7 +169,7 @@ getlang(int lang)
 static int
 maplookup(Trie *t, Str *key, Str *out)
 {
-	char buf[256], *v;
+	char buf[Maxutf], *v;
 	int klen, vlen;
 
 	if(key->n == 0)
@@ -341,7 +359,7 @@ imthread(void*)
 int
 mapget(Trie *t, Str *key, Str *out)
 {
-	char buf[256], *v;
+	char buf[Maxutf], *v;
 	int klen, vlen;
 
 	if(key->n == 0)