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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSDeviceIO
*
* @brief This header file provides the interfaces of the
* @ref RTEMSDeviceIO.
*/
/*
* Copyright (C) 2017, 2023 embedded brains GmbH & Co. KG
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _RTEMS_DEV_IO_H
#define _RTEMS_DEV_IO_H
#include <rtems/score/basedefs.h>
#include <stdarg.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/**
* @defgroup RTEMSDeviceIO Device I/O Support
*
* @ingroup RTEMSDeviceDrivers
*
* @brief This group contains the Device I/O Support API and implementation.
*
* @{
*/
/**
* @brief This type defines the put character handler.
*
* @param c is the character to put.
*
* @param arg is the user-provided argument.
*/
typedef void ( *IO_Put_char )( int c, void *arg );
/**
* @brief Prints characters using the put character handler according to the
* format string.
*
* @param put_char is the put character handler.
*
* @param arg is the user-provided argument for the put character handler.
*
* @param fmt is the printf()-style format string.
*
* @param ... is the list of parameters required by the format string.
*
* @return Returns the count of put characters.
*/
int _IO_Printf(
IO_Put_char put_char,
void *arg,
char const *fmt,
...
) RTEMS_PRINTFLIKE( 3, 4 );
/**
* @brief Prints characters using the put character handler according to the
* format string.
*
* @param put_char is the put character handler.
*
* @param arg is the user-provided argument for the put character handler.
*
* @param fmt is the printf()-style format string.
*
* @param ap is the argument list required by the format string.
*
* @return Returns the count of put characters.
*/
int _IO_Vprintf(
IO_Put_char put_char,
void *arg,
char const *fmt,
va_list ap
);
/**
* @brief Issues a couple of no-operation instructions.
*
* This function may be used to burn a couple of processor cycles with minimum
* impact on the system bus. It may be used in busy wait loops.
*/
void _IO_Relax( void );
/** @} */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* _RTEMS_DEV_IO_H */
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