disk.c

/*
 * Copyright (c) 2015, Ari Suutari <ari@stonepile.fi>.
 * 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.
 */

#include <picoos.h>
#include <picoos-u.h>
#include <string.h>
#include <errno.h>

#if UOSCFG_MAX_OPEN_FILES > 0

typedef const UosDisk* DiskRef;
UOS_BITTAB_TABLE(DiskRef, UOSCFG_MAX_MOUNT);
static DiskRefBittab diskTable;

int uosAddDisk(const UosDisk* newDisk)
{
  int slot =  UOS_BITTAB_ALLOC(diskTable);
  if (slot == -1) {

    nosPrintf("uosDisk: table full\n");
    return -1;
  }

  DiskRef* disk = UOS_BITTAB_ELEM(diskTable, slot);
  *disk = newDisk;
  return slot;
}

const UosDisk* uosGetDisk(int diskNumber)
{
  DiskRef* disk = UOS_BITTAB_ELEM(diskTable, diskNumber);
  if (disk == NULL)
    return NULL;

  return *disk;
}

#endif