| /** |
| * \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 2006/04/17 15:11:57 kthacker 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; |
| } |
| /*-----------------------------------------------------------------------------------*/ |
| /** @} */ |