tid_ripple.c

mpc8xx driver(led), based on tqm8

/***********************************************************************
 *
 * (C) Copyright 2000
 * Jean-Jacques Germond, Fr閐閞ic Soulier, Christian Batt; Alcatel
 * C/O [e-mail]
 *
 * All rights reserved.
 *
 * This code is free software; you can redistribute it and/or
 * modify it under the terms of the GNU *Library* General Public License
 * as published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This code 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
 * *Library* General Public License for more details.
 *
 * You should have received a copy of the GNU *Library* General Public
 * License along with this program (see file COPYING.LIB); if not,
 * write to the Free Software Foundation, Inc., 675 Mass Ave,
 * Cambridge, MA 02139, USA.
 *
 ***********************************************************************/

/* This file implements the ripple fonstion for the tid virtual file */

#ifndef __KERNEL__
/* We are buildind a stand alone ripple test */
#  include <stdio.h>
#  include <string.h>
#  define loff_t int
#else
   /* Ripple code is include in the tid driver */

   /* See AR pg:21  */
#  define __NO_VERSION__
#  include "tid_def.h"
#endif


static char tid_genericLine[] = "ABCDEF...TUVWXYZ"
                                "abcdef...tuvwxyz"
                                " <RIPPLE> "
                                "0123456789/!@#$%^\n";

static int tid_genLen;

  char*
tid_ripple(loff_t offset)
{
  int index;                              /* The offset in the generic line */
  int lineNbr     = (int)offset / tid_genLen;  /* The # of the virtual line */
  int indexInLine = (int)offset % tid_genLen;  /* The offset in the virtual line */

  if (indexInLine == (tid_genLen - 1)) {
    index = tid_genLen -1;   /* The addr of a <newline> */
  } else {
    /* This is not a <newline> char */
    int indexLeft = lineNbr;          /* The rippled first char for the line */
    index = indexLeft + indexInLine;  /* The index int ripple */
    if (index >= (tid_genLen - 1)) {
       index -= (tid_genLen - 1);
    }
  }
  return &tid_genericLine[index];
}

  int
tid_rippleInit(void)
{
  tid_genLen = strlen(tid_genericLine);
  return tid_genLen;
}




#ifndef __KERNEL__


main()
{
  int i;

  tid_rippleInit();

  for (i = 0; i < 400; i++) {
    char carac = *tid_ripple(i);
    printf("%c", carac);
  }
  printf("\nfini\n");
}

#endif	/* __KERNEL__ */