From f154d37853ae1f65512aefbe298e16ae9a3edeca Mon Sep 17 00:00:00 2001 From: Giovanni Di Sirio Date: Thu, 22 Jan 2015 15:40:38 +0000 Subject: git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7641 35acf78f-673a-0410-8e92-d51de3d6d3f4 --- os/hal/lib/streams/nullstreams.c | 92 ++++++++++++++++++++++++++++++++++++++++ os/hal/lib/streams/nullstreams.h | 86 +++++++++++++++++++++++++++++++++++++ 2 files changed, 178 insertions(+) create mode 100644 os/hal/lib/streams/nullstreams.c create mode 100644 os/hal/lib/streams/nullstreams.h diff --git a/os/hal/lib/streams/nullstreams.c b/os/hal/lib/streams/nullstreams.c new file mode 100644 index 000000000..88f6e5737 --- /dev/null +++ b/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; +} + +/** @} */ diff --git a/os/hal/lib/streams/nullstreams.h b/os/hal/lib/streams/nullstreams.h new file mode 100644 index 000000000..dd5c4e775 --- /dev/null +++ b/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_ */ + +/** @} */ -- cgit v1.2.3