137 lines
3.5 KiB
C
137 lines
3.5 KiB
C
/**
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* \file
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*
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* \brief System-specific implementation of the \ref _write function used by
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* the standard library.
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*
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* Copyright (c) 2009-2015 Atmel Corporation. All rights reserved.
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*
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* \asf_license_start
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*
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* \page License
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. The name of Atmel may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* 4. This software may only be redistributed and used in connection with an
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* Atmel microcontroller product.
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*
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* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* \asf_license_stop
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*
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*/
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/*
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* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
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*/
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#include "compiler.h"
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/**
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* \addtogroup group_common_utils_stdio
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*
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* \{
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*/
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volatile void *volatile stdio_base;
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int (*ptr_put)(void volatile*, char);
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#if ( defined(__ICCARM__))
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#include <yfuns.h>
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_STD_BEGIN
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#pragma module_name = "?__write"
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/*! \brief Writes a number of bytes, at most \a size, from the memory area
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* pointed to by \a buffer.
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*
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* If \a buffer is zero then \ref __write performs flushing of internal buffers,
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* if any. In this case, \a handle can be \c -1 to indicate that all handles
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* should be flushed.
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*
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* \param handle File handle to write to.
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* \param buffer Pointer to buffer to read bytes to write from.
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* \param size Number of bytes to write.
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*
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* \return The number of bytes written, or \c _LLIO_ERROR on failure.
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*/
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size_t __write(int handle, const unsigned char *buffer, size_t size)
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{
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size_t nChars = 0;
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if (buffer == 0) {
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// This means that we should flush internal buffers.
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return 0;
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}
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// This implementation only writes to stdout and stderr.
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// For all other file handles, it returns failure.
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if (handle != _LLIO_STDOUT && handle != _LLIO_STDERR) {
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return _LLIO_ERROR;
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}
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for (; size != 0; --size) {
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if (ptr_put(stdio_base, *buffer++) < 0) {
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return _LLIO_ERROR;
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}
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++nChars;
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}
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return nChars;
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}
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_STD_END
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#elif (defined(__GNUC__))
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int __attribute__((weak))
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_write (int file, char * ptr, int len);
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int __attribute__((weak))
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_write (int file, char * ptr, int len)
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{
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int nChars = 0;
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if ((file != 1) && (file != 2) && (file!=3)) {
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return -1;
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}
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for (; len != 0; --len) {
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if (ptr_put(stdio_base, *ptr++) < 0) {
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return -1;
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}
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++nChars;
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}
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return nChars;
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}
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#endif
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/**
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* \}
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*/
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