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122 lines
3.7 KiB
C
122 lines
3.7 KiB
C
/**
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* \addtogroup c64fs
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* @{
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*/
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/**
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* \file
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* Implementation of C64 file writes.
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* \author Adam Dunkels <adam@dunkels.com>
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*
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* The functions in this file are not included in the core Contiki
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* code, but must be explicitly linked by an application that that
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* wishes to be able to write to files.
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*/
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/*
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* Copyright (c) 2003, Adam Dunkels.
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* All rights reserved.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This file is part of the Contiki desktop environment
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*
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* $Id: c64-fs-write.c,v 1.1 2006/06/17 22:41:26 adamdunkels Exp $
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*
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*/
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#include "c64-dio.h"
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#include "c64-fs.h"
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#include <string.h>
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/* An *UGLY* implementation of c64_fs_write that only can be used to
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overwrite a single block file. */
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extern unsigned char _c64_fs_filebuf[256];
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extern unsigned char _c64_fs_filebuftrack,
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_c64_fs_filebufsect;
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/*-----------------------------------------------------------------------------------*/
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/**
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* Write data to an open file.
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*
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* \note This function currently does not support writing to other than a single block file (cannot be more than 254 bytes long).
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*
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* \param f A pointer to a file descriptor previously opened with c64_fs_open().
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*
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* \param buf A pointer to a buffer with data that should be written
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* to the file.
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*
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* \param len The length of the data that should be written.
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*
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* \return The number of bytes actually written.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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int __fastcall__
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c64_fs_write(register struct c64_fs_file *f, char *buf, int len)
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{
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int i;
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if(len <= 0) {
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return 0;
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}
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/* Check if current block is already in buffer, and if not read it
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from disk. */
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if(_c64_fs_filebuftrack != f->track ||
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_c64_fs_filebufsect != f->sect) {
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_c64_fs_filebuftrack = f->track;
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_c64_fs_filebufsect = f->sect;
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c64_dio_read_block(_c64_fs_filebuftrack,
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_c64_fs_filebufsect,
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_c64_fs_filebuf);
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}
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i = 256 - f->ptr;
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if(len < i) {
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i = len;
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}
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memcpy(&_c64_fs_filebuf[f->ptr], buf, i);
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f->ptr += i;
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if(_c64_fs_filebuf[0] == 0 &&
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f->ptr > _c64_fs_filebuf[1]) {
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_c64_fs_filebuf[1] = f->ptr;
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}
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c64_dio_write_block(_c64_fs_filebuftrack,
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_c64_fs_filebufsect,
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_c64_fs_filebuf);
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return i;
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}
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/*-----------------------------------------------------------------------------------*/
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/** @} */
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