telev: make parameter const and add NULL pointer check

baresip · Sep 23, 2022 · 8ee6930 · 8ee6930
1 parent d82cb2a
commit 8ee6930
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Showing 2 changed files with 5 additions and 2 deletions.
diff --git a/include/re_telev.h b/include/re_telev.h
@@ -18,7 +18,7 @@ int telev_set_srate(struct telev *tel, uint32_t srate);
 int telev_send(struct telev *tel, int event, bool end);
 int telev_recv(struct telev *tel, struct mbuf *mb, int *event, bool *end);
 int telev_poll(struct telev *tel, bool *marker, struct mbuf *mb);
-bool telev_is_empty(struct telev *tel);
+bool telev_is_empty(const struct telev *tel);
 
 int telev_digit2code(int digit);
 int telev_code2digit(int code);
diff --git a/src/telev/telev.c b/src/telev/telev.c
@@ -341,8 +341,11 @@ int telev_poll(struct telev *tel, bool *marker, struct mbuf *mb)
 }
 
 
-bool telev_is_empty(struct telev *tel)
+bool telev_is_empty(const struct telev *tel)
 {
+	if (!tel)
+		return true;
+
 	return tel->state == IDLE && !mbuf_get_left(tel->mb);
 }