Import Mbed OS hard-float snapshot

drivers/tests/TESTS/mbed_drivers/dev_null/main.cpp

@@ -0,0 +1,56 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2013-2014 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "mbed.h"
+#include "platform/Stream.h"
+#include "greentea-client/test_env.h"
+
+class DevNull : public Stream {
+public:
+    DevNull(const char *name = NULL) : Stream(name) {}
+
+protected:
+    virtual int _getc()
+    {
+        return 0;
+    }
+    virtual int _putc(int c)
+    {
+        return c;
+    }
+};
+
+DevNull null("null");
+
+int main()
+{
+    GREENTEA_SETUP(2, "dev_null_auto");
+
+    printf("MBED: before re-routing stdout to /null\n");   // This shouldn't appear
+    greentea_send_kv("to_stdout", "re-routing stdout to /null");
+
+    if (freopen("/null", "w", stdout)) {
+        // This shouldn't appear on serial
+        // We should use pure printf here to send KV
+        printf("{{to_null;printf redirected to /null}}\n");
+        printf("MBED: this printf is already redirected to /null\n");
+    }
+
+    while (1) {
+        // Success is determined by the host test at this point, so busy wait
+    }
+}