1 files changed, 26 insertions, 1 deletions
diff --git a/libterminput_unmarshal_state.c b/libterminput_unmarshal_state.c
index fd1d6db..a41c4fe 100644
--- a/libterminput_unmarshal_state.c
+++ b/libterminput_unmarshal_state.c
@@ -5,5 +5,30 @@
 int
 libterminput_unmarshal_state(struct libterminput_unmarshaller *how, struct libterminput_state *what) /* TODO test */
 {
-	return how->load(how, what, sizeof(*what));
+	if (how->load(how, what, sizeof(*what)))
+		return -1;
+	if (what->inited < 0 || what->inited > 1 ||
+	    what->bracketed_paste > 1U ||
+	    what->meta > 2U ||
+	    what->n >= sizeof(what->partial) ||
+	    what->npartial >= sizeof(what->partial) ||
+	    what->stored_tail > what->stored_head ||
+	    what->stored_head > sizeof(what->stored) ||
+	    what->unused_bits)
+		goto einval;
+	switch (what->mouse_tracking) {
+	case 0:
+	case 1:
+	case 2:
+	case 3:
+	case 6:
+		break;
+	default:
+		goto einval;
+	}
+	return 0;
+
+einval:
+	errno = EINVAL;
+	return -1;
 }