1 files changed, 11 insertions, 0 deletions
diff --git a/py/stream.c b/py/stream.c
index 07a79248ab..cfdea15cca 100644
--- a/py/stream.c
+++ b/py/stream.c
@@ -33,9 +33,13 @@
 #include "qstr.h"
 #include "obj.h"
 #include "objstr.h"
+#include "runtime.h"
 #include "stream.h"
 #if MICROPY_STREAMS_NON_BLOCK
 #include <errno.h>
+#if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)
+#define EWOULDBLOCK 140
+#endif
 #endif
 
 // This file defines generic Python stream read/write methods which
@@ -67,6 +71,13 @@ STATIC mp_obj_t stream_read(uint n_args, const mp_obj_t *args) {
     if (n_args == 1 || ((sz = mp_obj_get_int(args[1])) == -1)) {
         return stream_readall(args[0]);
     }
+
+    #if MICROPY_PY_BUILTINS_STR_UNICODE
+    if (!o->type->stream_p->is_bytes) {
+        mp_not_implemented("Reading from unicode text streams by character count");
+    }
+    #endif
+
     byte *buf = m_new(byte, sz);
     int error;
     machine_int_t out_sz = o->type->stream_p->read(o, buf, sz, &error);