# stdlib_private.h

/* Copyright (c) 2004, Joerg Wunsch

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* 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.
* Neither the name of the copyright holders nor the names of
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.
*/

/* $Id$ */

#include <inttypes.h>
#include <stdlib.h>
#include <avr/io.h>

#if !defined(__DOXYGEN__)

struct __freelist {
size_t sz;
struct __freelist *nx;
};

#endif

extern char *__brkval;          /* first location not yet allocated */
extern struct __freelist *__flp; /* freelist pointer (head of freelist) */
extern size_t __malloc_margin;  /* user-changeable before the first malloc() */
extern char *__malloc_heap_start;
extern char *__malloc_heap_end;

#ifndef __AVR__

/*
* When compiling malloc.c/realloc.c natively on a host machine, it will
* include a main() that performs a regression test.  This is meant as
* a debugging aid, where a normal source-level debugger will help to
* verify that the various allocator structures have the desired
* appearance at each stage.
*
* When cross-compiling with avr-gcc, it will compile into just the
* library functions malloc() and free().
*/
#define MALLOC_TEST

#endif /* !__AVR__ */

#ifdef MALLOC_TEST

extern void *mymalloc(size_t);
extern void myfree(void *);
extern void *myrealloc(void *, size_t);

#define malloc mymalloc
#define free myfree
#define realloc myrealloc

#define __heap_start mymem[0]
#define __heap_end mymem[256]
extern char mymem[];
#define STACK_POINTER() (mymem + 256)

#else /* !MALLOC_TEST */

extern char __heap_start;
extern char __heap_end;

/* Needed for definition of AVR_STACK_POINTER_REG. */
#include <avr/io.h>

#define STACK_POINTER() ((char *)AVR_STACK_POINTER_REG)

#endif /* MALLOC_TEST */