vstr: Restore bytestr compatibility.

1 files changed, 8 insertions, 0 deletions

diff --git a/py/vstr.c b/py/vstr.c
index 2dbc6f04a3..9ccc95d49b 100644
--- a/py/vstr.c
+++ b/py/vstr.c
@@ -199,6 +199,7 @@ void vstr_add_byte(vstr_t *vstr, byte b) {
 }
 
 void vstr_add_char(vstr_t *vstr, unichar c) {
+#if MICROPY_PY_BUILTINS_STR_UNICODE
     // TODO: Can this be simplified and deduplicated?
     // Is it worth just calling vstr_add_len(vstr, 4)?
     if (c < 0x80) {
@@ -233,6 +234,13 @@ void vstr_add_char(vstr_t *vstr, unichar c) {
         buf[2] = ((c >> 6) & 0x3F) | 0x80;
         buf[3] = (c & 0x3F) | 0x80;
     }
+#else
+    byte *buf = (byte*)vstr_add_len(vstr, 1);
+    if (buf == NULL) {
+        return;
+    }
+    buf[0] = c;
+#endif
 }
 
 void vstr_add_str(vstr_t *vstr, const char *str) {