ardupilot/libraries/AP_HAL/utility/BetterStream.h

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//
// Copyright (c) 2010 Michael Smith. All rights reserved.
//
// This is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License as published by the
// Free Software Foundation; either version 2.1 of the License, or (at
// your option) any later version.
//
#ifndef __AP_HAL_UTILITY_BETTERSTREAM_H__
#define __AP_HAL_UTILITY_BETTERSTREAM_H__
#include <stdarg.h>
#include "../AP_HAL_Namespace.h"
#include "Stream.h"
/* prog_char_t: */
#include <AP_Progmem.h>
/* AP_HAL::BetterStream is a pure virtual interface. It resembles
* Michael Smith's BetterStream library for Arduino.
* The Michael Smith BetterStream provided some implementations for AVR based
* on _vprintf().
* Please provide your own platform-specic implementation of vprintf, sprintf,
* etc. to implement the printf functions.
*
* TODO: Segregate prog_char_t dependent functions to be available on AVR
* platform only, with default implementations elsewhere.
*/
class AP_HAL::BetterStream : public AP_HAL::Stream {
public:
BetterStream(void) {}
virtual void print_P(const prog_char_t *) = 0;
virtual void println_P(const prog_char_t *) = 0;
virtual void printf(const char *, ...)
__attribute__ ((format(__printf__, 2, 3))) = 0;
/* No format checking on printf_P: can't currently support that on AVR */
virtual void _printf_P(const prog_char *, ...) = 0;
#define printf_P(fmt, ...) _printf_P((const prog_char *)fmt, ## __VA_ARGS__)
virtual void vprintf(const char *, va_list) = 0;
virtual void vprintf_P(const prog_char *, va_list) = 0;
};
#endif // __AP_HAL_UTILITY_BETTERSTREAM_H__