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/*
* Project: S.Ha.R.K.
*
* Coordinators:
* Giorgio Buttazzo <giorgio@sssup.it>
* Paolo Gai <pj@gandalf.sssup.it>
*
* Authors :
* Paolo Gai <pj@gandalf.sssup.it>
* (see the web pages for full authors list)
*
* ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
*
* http://www.sssup.it
* http://retis.sssup.it
* http://shark.sssup.it
*/
/**
------------
CVS : $Id: dosfs.c,v 1.1.1.1 2002-09-02 09:37:41 pj Exp $
File: $File$
Revision: $Revision: 1.1.1.1 $
Last update: $Date: 2002-09-02 09:37:41 $
------------
**/
/*
* Copyright (C) 2000 Paolo Gai and Gabriele Bolognini
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "kernel/kern.h"
#include "string.h"
#include "ll/i386/x-dos.h"
/* This is the buffer used by read_myfile */
char myfilebuf[1000];
/* This is the number of bytes read by read_myfile */
int myfilebuf_length;
/* This function write myfile.out (up to 30 chars) */
void write_myfile(void *arg);
int main(int argc, char **argv)
{
int x;
cprintf("\nBuffer contents:\n");
for (x=0; x<myfilebuf_length; x++)
cputc(myfilebuf[x]);
/*
WARNING: You can call these functions only when you are in
real mode!!!
The system is in real mode:
- into __kernel_register_levels__()
- into sys_atrunlevel functions posted with RUNLEVEL_AFTER_EXIT
*/
if (myfilebuf_length)
sys_atrunlevel(write_myfile, NULL, RUNLEVEL_AFTER_EXIT);
return 0;
/*
* Since there is only one user task, the kernel will shut down after this
* task finishes...
*/
}
/* This function read myfile.txt (up to 1000 chars) */
void read_myfile(void)
{
/* DOS file descriptor */
DOS_FILE *f;
/* Error code */
int err;
/* open the DOS file for reading (you can specify only "r" or "w") */
f = DOS_fopen("myfile.txt","r");
/* check for open errors */
if (!f) {
/* error!! */
err = DOS_error();
/* note that if you call DOS_error() here, it return 0!!! */
cprintf("Error %d opening myfile.txt...\n", err);
myfilebuf_length = 0;
return;
}
/* read up to 1000 chars */
myfilebuf_length = DOS_fread(&myfilebuf,1,1000,f);
/* check for errors */
err = DOS_error();
cprintf("Read %d bytes from myfile.txt...\n", myfilebuf_length);
if (err) {
cprintf("Error %d reading myfile.txt...\n", err);
myfilebuf_length = 0;
/* there is not return because I want to close the file! */
}
/* Close the file */
DOS_fclose(f);
}
/* This function write myfile.out (up to 30 chars) */
void write_myfile(void *arg)
{
DOS_FILE *f; /* DOS file descriptor */
int err; /* Error code */
int maxbytes;
int writtenbytes; /* number of files written */
/* open the DOS file for writing (you can specify only "r" or "w") */
f = DOS_fopen("myfile.out","w");
/* check for open errors */
if (!f) {
/* error!! */
err = DOS_error();
/* note that if you call DOS_error() here, it return 0!!! */
cprintf("Error %d opening myfile.out...\n", err);
return;
}
/* write up to 30 bytes */
if (myfilebuf_length > 30)
maxbytes = 30;
else
maxbytes = myfilebuf_length;
writtenbytes = DOS_fwrite(myfilebuf,1,maxbytes,f);
/* check for errors */
err = DOS_error();
cprintf("Written %d bytes into myfile.out...\n", writtenbytes);
if (err) {
cprintf("Error %d writing myfile.txt...\n", err);
/* there is not return because I want to close the file! */
}
/* Close the file */
DOS_fclose(f);
}