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/* Copyright (c) 2004, 2009 Xilinx, Inc.  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 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 Xilinx 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 HOLDER 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
   HOLDER 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.
 
*/
 
#include <errno.h>
 
extern char _heap_start[];
extern char _heap[];
extern char _heap_end[];
 
static char *heap_ptr;
 
char *sbrk (int nbytes)
{
  char *base;
 
  if (!heap_ptr)
    heap_ptr = (char *)&_heap;
 
  base = heap_ptr;
  heap_ptr += nbytes;
 
  if (heap_ptr <= ((char *)&_heap_end + 1))
    return base;
  else
    {
      errno = ENOMEM;
      return ((char *)-1);
    }
}