121 lines
3.7 KiB
C
121 lines
3.7 KiB
C
/**
|
|
* \addtogroup c64fs
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* Implementation of C64 file writes.
|
|
* \author Adam Dunkels <adam@dunkels.com>
|
|
*
|
|
* The functions in this file are not included in the core Contiki
|
|
* code, but must be explicitly linked by an application that that
|
|
* wishes to be able to write to files.
|
|
*/
|
|
|
|
|
|
/*
|
|
* Copyright (c) 2003, Adam Dunkels.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials provided
|
|
* with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote
|
|
* products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
|
|
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
|
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
|
|
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* This file is part of the Contiki desktop environment
|
|
*
|
|
* $Id: c64-fs-write.c,v 1.1 2007/05/23 23:11:28 oliverschmidt Exp $
|
|
*
|
|
*/
|
|
|
|
#include "c64-dio.h"
|
|
#include "c64-fs.h"
|
|
#include <string.h>
|
|
|
|
/* An *UGLY* implementation of c64_fs_write that only can be used to
|
|
overwrite a single block file. */
|
|
|
|
extern unsigned char _c64_fs_filebuf[256];
|
|
extern unsigned char _c64_fs_filebuftrack,
|
|
_c64_fs_filebufsect;
|
|
|
|
|
|
/*-----------------------------------------------------------------------------------*/
|
|
/**
|
|
* Write data to an open file.
|
|
*
|
|
* \note This function currently does not support writing to other than a single block file (cannot be more than 254 bytes long).
|
|
*
|
|
* \param f A pointer to a file descriptor previously opened with c64_fs_open().
|
|
*
|
|
* \param buf A pointer to a buffer with data that should be written
|
|
* to the file.
|
|
*
|
|
* \param len The length of the data that should be written.
|
|
*
|
|
* \return The number of bytes actually written.
|
|
*
|
|
*/
|
|
/*-----------------------------------------------------------------------------------*/
|
|
int __fastcall__
|
|
c64_fs_write(register struct c64_fs_file *f, char *buf, int len)
|
|
{
|
|
int i;
|
|
|
|
if(len <= 0) {
|
|
return 0;
|
|
}
|
|
|
|
/* Check if current block is already in buffer, and if not read it
|
|
from disk. */
|
|
if(_c64_fs_filebuftrack != f->track ||
|
|
_c64_fs_filebufsect != f->sect) {
|
|
_c64_fs_filebuftrack = f->track;
|
|
_c64_fs_filebufsect = f->sect;
|
|
c64_dio_read_block(_c64_fs_filebuftrack,
|
|
_c64_fs_filebufsect,
|
|
_c64_fs_filebuf);
|
|
}
|
|
|
|
i = 256 - f->ptr;
|
|
if(len < i) {
|
|
i = len;
|
|
}
|
|
|
|
memcpy(&_c64_fs_filebuf[f->ptr], buf, i);
|
|
|
|
f->ptr += i;
|
|
if(_c64_fs_filebuf[0] == 0 &&
|
|
f->ptr > _c64_fs_filebuf[1]) {
|
|
_c64_fs_filebuf[1] = f->ptr;
|
|
}
|
|
|
|
c64_dio_write_block(_c64_fs_filebuftrack,
|
|
_c64_fs_filebufsect,
|
|
_c64_fs_filebuf);
|
|
|
|
return i;
|
|
}
|
|
/*-----------------------------------------------------------------------------------*/
|
|
/** @} */
|