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1085 pj 1
/*
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 * Project: S.Ha.R.K.
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 *
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 * Coordinators:
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 *   Giorgio Buttazzo    <giorgio@sssup.it>
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *
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 * Authors     :
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *   (see the web pages for full authors list)
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 *
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 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
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 *
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 * http://www.sssup.it
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 * http://retis.sssup.it
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 * http://shark.sssup.it
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 */
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/**
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 ------------
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 CVS :        $Id: dosfs.c,v 1.1.1.1 2002-09-02 09:37:41 pj Exp $
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 File:        $File$
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 Revision:    $Revision: 1.1.1.1 $
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 Last update: $Date: 2002-09-02 09:37:41 $
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 ------------
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**/
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/*
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 * Copyright (C) 2000 Paolo Gai and Gabriele Bolognini
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 */
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#include "kernel/kern.h"
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#include "string.h"
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#include "ll/i386/x-dos.h"
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/* This is the buffer used by read_myfile */
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char myfilebuf[1000];
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/* This is the number of bytes read by read_myfile */
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int myfilebuf_length;
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/* This function write myfile.out (up to 30 chars) */
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void write_myfile(void *arg);
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int main(int argc, char **argv)
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{
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  int x;
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  cprintf("\nBuffer contents:\n");
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  for (x=0; x<myfilebuf_length; x++)
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    cputc(myfilebuf[x]);
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  /*
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     WARNING: You can call these functions only when you are in
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              real mode!!!
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     The system is in real mode:
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     - into __kernel_register_levels__()
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     - into sys_atrunlevel functions posted with RUNLEVEL_AFTER_EXIT
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  */
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  if (myfilebuf_length)
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    sys_atrunlevel(write_myfile, NULL, RUNLEVEL_AFTER_EXIT);
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  return 0;
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  /*
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   * Since there is only one user task, the kernel will shut down after this
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   * task finishes...
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   */
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}
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/* This function read myfile.txt (up to 1000 chars) */
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void read_myfile(void)
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{
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  /* DOS file descriptor */
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  DOS_FILE *f;
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  /* Error code */
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  int err;
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  /* open the DOS file for reading  (you can specify only "r" or "w") */
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  f = DOS_fopen("myfile.txt","r");
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  /* check for open errors */
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  if (!f) {
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    /* error!! */
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    err = DOS_error();
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    /* note that if you call DOS_error() here, it return 0!!! */
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    cprintf("Error %d opening myfile.txt...\n", err);
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    myfilebuf_length = 0;
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    return;
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  }
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  /* read up to 1000 chars */
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  myfilebuf_length = DOS_fread(&myfilebuf,1,1000,f);
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  /* check for errors */
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  err = DOS_error();
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  cprintf("Read %d bytes from myfile.txt...\n", myfilebuf_length);
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  if (err) {
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    cprintf("Error %d reading myfile.txt...\n", err);
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    myfilebuf_length = 0;
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    /* there is not return because I want to close the file! */
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  }
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  /* Close the file */
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  DOS_fclose(f);
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}
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/* This function write myfile.out (up to 30 chars) */
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void write_myfile(void *arg)
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{
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  DOS_FILE *f;  /* DOS file descriptor */
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  int err;  /* Error code */
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  int maxbytes;
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  int writtenbytes;  /* number of files written */
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  /* open the DOS file for writing  (you can specify only "r" or "w") */
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  f = DOS_fopen("myfile.out","w");
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  /* check for open errors */
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  if (!f) {
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    /* error!! */
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    err = DOS_error();
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    /* note that if you call DOS_error() here, it return 0!!! */
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    cprintf("Error %d opening myfile.out...\n", err);
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    return;
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  }
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  /* write up to 30 bytes */
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  if (myfilebuf_length > 30)
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    maxbytes = 30;
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  else
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    maxbytes = myfilebuf_length;
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  writtenbytes = DOS_fwrite(myfilebuf,1,maxbytes,f);
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  /* check for errors */
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  err = DOS_error();
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  cprintf("Written %d bytes into myfile.out...\n", writtenbytes);
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  if (err) {
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    cprintf("Error %d writing myfile.txt...\n", err);
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    /* there is not return because I want to close the file! */
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  }
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  /* Close the file */
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  DOS_fclose(f);
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}
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