git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7641 35acf78f-673a-0410-8e92-d51de3d6d3f4

os/hal/lib/streams/nullstreams.c

@@ -0,0 +1,92 @@
+/*
+    ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio
+
+    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.
+*/
+
+/**
+ * @file    nullstreams.c
+ * @brief   Null streams code.
+ *
+ * @addtogroup null_streams
+ * @{
+ */
+
+#include "hal.h"
+#include "nullstreams.h"
+
+/*===========================================================================*/
+/* Driver local definitions.                                                 */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables.                                                */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local variables.                                                   */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions.                                                   */
+/*===========================================================================*/
+
+static size_t writes(void *ip, const uint8_t *bp, size_t n) {
+
+  (void)ip;
+  (void)bp;
+
+  return n;
+}
+
+static size_t reads(void *ip, uint8_t *bp, size_t n) {
+
+  (void)ip;
+  (void)bp;
+  (void)n;
+
+  return 0;
+}
+
+static msg_t put(void *ip, uint8_t b) {
+
+  (void)ip;
+  (void)b;
+
+  return MSG_OK;
+}
+
+static msg_t get(void *ip) {
+
+  (void)ip;
+
+  return 4;
+}
+
+static const struct NullStreamVMT vmt = {writes, reads, put, get};
+
+/*===========================================================================*/
+/* Driver exported functions.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   Null stream object initialization.
+ *
+ * @param[out] nsp      pointer to the @p NullStream object to be initialized
+ */
+void nullObjectInit(NullStream *nsp) {
+
+  nsp->vmt = &vmt;
+}
+
+/** @} */

os/hal/lib/streams/nullstreams.h

@@ -0,0 +1,86 @@
+/*
+    ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio
+
+    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.
+*/
+
+/**
+ * @file    nullstreams.h
+ * @brief   Null streams structures and macros.
+ 
+ * @addtogroup null_streams
+ * @{
+ */
+
+#ifndef _NULLSTREAMS_H_
+#define _NULLSTREAMS_H_
+
+/*===========================================================================*/
+/* Driver constants.                                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver pre-compile time settings.                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Derived constants and error checks.                                       */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver data structures and types.                                         */
+/*===========================================================================*/
+
+/**
+ * @brief   @p NullStream specific data.
+ */
+#define _null_stream_data                                                   \
+  _base_sequential_stream_data
+
+/**
+ * @brief   @p NullStream virtual methods table.
+ */
+struct NullStreamVMT {
+  _base_sequential_stream_methods
+};
+
+/**
+ * @extends BaseSequentialStream
+ *
+ * @brief   Null stream object.
+ */
+typedef struct {
+  /** @brief Virtual Methods Table.*/
+  const struct NullStreamVMT *vmt;
+  _null_stream_data
+} NullStream;
+
+/*===========================================================================*/
+/* Driver macros.                                                            */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* External declarations.                                                    */
+/*===========================================================================*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  void nullObjectInit(NullStream *nsp);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _NULLSTREAMS_H_ */
+
+/** @} */