/*
    ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.

    This file is part of ChibiOS/RT.

    ChibiOS/RT 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 3 of the License, or
    (at your option) any later version.

    ChibiOS/RT 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, see <http://www.gnu.org/licenses/>.
*/
/*
* **** This file incorporates work covered by the following copyright and ****
* **** permission notice:                                                 ****
*
*  Copyright (c) 2009 by Michael Fischer. 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. Neither the name of the author nor the names of its contributors may
*     be used to endorse or promote products derived from this software
*     without specific prior written permission.
*
*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
*  "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
*
****************************************************************************
*  History:
*
*  28.03.09  mifi       First Version, based on the original syscall.c from
*                       newlib version 1.17.0
*  17.08.09  gdisirio   Modified the file for use under ChibiOS/RT
*  15.11.09  gdisirio   Added read and write handling
****************************************************************************/

#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>

#include "ch.h"
#if defined(STDOUT_SD) || defined(STDIN_SD)
#include "hal.h"
#endif

/***************************************************************************/

int _read_r(struct _reent *r, int file, char * ptr, int len)
{
  (void)r;
#if defined(STDIN_SD)
  if (!len || (file != 0)) {
    __errno_r(r) = EINVAL;
    return -1;
  }
  *ptr++ = chIOGet(&STDOUT_SD);
  if (--len > 0)
    len = chIORead(&STDOUT_SD, (uint8_t *)ptr, (size_t)len);
  return len;
#else
  (void)file;
  (void)ptr;
  (void)len;
  __errno_r(r) = EINVAL;
  return -1;
#endif
}

/***************************************************************************/

int _lseek_r(struct _reent *r, int file, int ptr, int dir)
{
  (void)r;
  (void)file;
  (void)ptr;
  (void)dir;

  return 0;
}

/***************************************************************************/

int _write_r(struct _reent *r, int file, char * ptr, int len)
{
#if defined(STDOUT_SD)
  int n;
#endif

  (void)r;
  (void)file;
  (void)ptr;
#if defined(STDOUT_SD)
  if (file != 1) {
    __errno_r(r) = EINVAL;
    return -1;
  }
  n = len;
  while (n--)
    chIOPut(&STDOUT_SD, *ptr++);
#endif
  return len;
}

/***************************************************************************/

int _close_r(struct _reent *r, int file)
{
  (void)r;
  (void)file;

  return 0;
}

/***************************************************************************/

caddr_t _sbrk_r(struct _reent *r, int incr)
{
  void *p;

  chDbgCheck(incr > 0, "_sbrk_r");

  (void)r;
  p = chCoreAlloc((size_t)incr);
  if (p == NULL) {
    __errno_r(r) = ENOMEM;
    return (caddr_t)-1;
  }
  return (caddr_t)p;
}

/***************************************************************************/

int _fstat_r(struct _reent *r, int file, struct stat * st)
{
  (void)r;
  (void)file;

  memset(st, 0, sizeof(*st));
  st->st_mode = S_IFCHR;
  return 0;
}

/***************************************************************************/

int _isatty_r(struct _reent *r, int fd)
{
  (void)r;
  (void)fd;

  return 1;
}

/*** EOF ***/