/**
 * \file
 *
 * \brief System-specific implementation of the \ref _write function used by
 *         the standard library.
 *
 * Copyright (c) 2009-2018 Microchip Technology Inc. and its subsidiaries.
 *
 * \asf_license_start
 *
 * \page License
 *
 * Subject to your compliance with these terms, you may use Microchip
 * software and any derivatives exclusively with Microchip products.
 * It is your responsibility to comply with third party license terms applicable
 * to your use of third party software (including open source software) that
 * may accompany Microchip software.
 *
 * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
 * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
 * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
 * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
 * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
 * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
 * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
 * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
 * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
 * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
 * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
 *
 * \asf_license_stop
 *
 */
/*
 * Support and FAQ: visit <a href="https://www.microchip.com/support/">Microchip Support</a>
 */

#include "compiler.h"

/**
 * \addtogroup group_common_utils_stdio
 *
 * \{
 */

volatile void *volatile stdio_base;
int (*ptr_put)(void volatile*, char);


#if ( defined(__ICCARM__))

#include <yfuns.h>

#if (__VER__ < 8010000)
// Refer http://ftp.iar.se/WWWfiles/arm/webic/doc/EWARM_MigrationGuide.ENU.pdf
_STD_BEGIN
#endif

#pragma module_name = "?__write"

/*! \brief Writes a number of bytes, at most \a size, from the memory area
 *         pointed to by \a buffer.
 *
 * If \a buffer is zero then \ref __write performs flushing of internal buffers,
 * if any. In this case, \a handle can be \c -1 to indicate that all handles
 * should be flushed.
 *
 * \param handle File handle to write to.
 * \param buffer Pointer to buffer to read bytes to write from.
 * \param size Number of bytes to write.
 *
 * \return The number of bytes written, or \c _LLIO_ERROR on failure.
 */
size_t __write(int handle, const unsigned char *buffer, size_t size)
{
	size_t nChars = 0;

	if (buffer == 0) {
		// This means that we should flush internal buffers.
		return 0;
	}

	// This implementation only writes to stdout and stderr.
	// For all other file handles, it returns failure.
	if (handle != _LLIO_STDOUT && handle != _LLIO_STDERR) {
		return _LLIO_ERROR;
	}

	for (; size != 0; --size) {
		if (ptr_put(stdio_base, *buffer++) < 0) {
			return _LLIO_ERROR;
		}
		++nChars;
	}
	return nChars;
}

#if (__VER__ < 8010000)
// Refer http://ftp.iar.se/WWWfiles/arm/webic/doc/EWARM_MigrationGuide.ENU.pdf
_STD_END
#endif


#elif (defined(__GNUC__))

int __attribute__((weak))
_write (int file, char * ptr, int len);

int __attribute__((weak))
_write (int file, char * ptr, int len)
{
	int nChars = 0;

	if ((file != 1) && (file != 2) && (file!=3)) {
		return -1;
	}

	for (; len != 0; --len) {
		if (ptr_put(stdio_base, *ptr++) < 0) {
			return -1;
		}
		++nChars;
	}
	return nChars;
}

#endif

/**
 * \}
 */

