157 lines
4.0 KiB
C
157 lines
4.0 KiB
C
/**
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* \file
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*
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* \brief System-specific implementation of the \ref _read 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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* \defgroup group_common_utils_stdio Standard I/O (stdio)
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*
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* Common standard I/O driver that implements the stdio
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* read and write functions on AVR and SAM devices.
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*
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* \{
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*/
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extern volatile void *volatile stdio_base;
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void (*ptr_get)(void volatile*, char*);
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// IAR common implementation
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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 = "?__read"
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/*! \brief Reads a number of bytes, at most \a size, into the memory area
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* pointed to by \a buffer.
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*
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* \param handle File handle to read from.
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* \param buffer Pointer to buffer to write read bytes to.
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* \param size Number of bytes to read.
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*
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* \return The number of bytes read, \c 0 at the end of the file, or
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* \c _LLIO_ERROR on failure.
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*/
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size_t __read(int handle, unsigned char *buffer, size_t size)
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{
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int nChars = 0;
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// This implementation only reads from stdin.
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// For all other file handles, it returns failure.
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if (handle != _LLIO_STDIN) {
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return _LLIO_ERROR;
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}
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for (; size > 0; --size) {
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ptr_get(stdio_base, (char*)buffer);
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buffer++;
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nChars++;
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}
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return nChars;
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}
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/*! \brief This routine is required by IAR DLIB library since EWAVR V6.10
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* the implementation is empty to be compatible with old IAR version.
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*/
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int __close(int handle)
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{
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UNUSED(handle);
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return 0;
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}
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/*! \brief This routine is required by IAR DLIB library since EWAVR V6.10
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* the implementation is empty to be compatible with old IAR version.
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*/
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int remove(const char* val)
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{
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UNUSED(val);
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return 0;
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}
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/*! \brief This routine is required by IAR DLIB library since EWAVR V6.10
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* the implementation is empty to be compatible with old IAR version.
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*/
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long __lseek(int handle, long val, int val2)
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{
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UNUSED(handle);
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UNUSED(val2);
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return val;
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}
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_STD_END
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// GCC implementation
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#elif (defined(__GNUC__))
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int __attribute__((weak))
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_read (int file, char * ptr, int len); // Remove GCC compiler warning
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int __attribute__((weak))
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_read (int file, char * ptr, int len)
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{
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int nChars = 0;
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if (file != 0) {
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return -1;
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}
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for (; len > 0; --len) {
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ptr_get(stdio_base, ptr);
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ptr++;
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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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