Retro68/libretro/malloc.c

/*
	Copyright 2015 Wolfgang Thaller.

	This file is part of Retro68.

	Retro68 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.

	Retro68 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.

	Under Section 7 of GPL version 3, you are granted additional
	permissions described in the GCC Runtime Library Exception, version
	3.1, as published by the Free Software Foundation.

	You should have received a copy of the GNU General Public License and
	a copy of the GCC Runtime Library Exception along with this program;
	see the files COPYING and COPYING.RUNTIME respectively.  If not, see
	<http://www.gnu.org/licenses/>.
*/

#include <stdlib.h>
#include <errno.h>
#include <reent.h>
#include <string.h>
#include <MacMemory.h>

void referenceMyMalloc() {}

void *_malloc_r(struct _reent *reent_ptr, size_t sz)
{
	Ptr p = NewPtr(sz);

	if(!p)
		reent_ptr->_errno = ENOMEM;

	return p;
}
void *_calloc_r(struct _reent *reent_ptr, size_t sz, size_t sz2)
{
	Ptr p = NewPtrClear(sz*sz2);

	if(!p)
		reent_ptr->_errno = ENOMEM;

	return p;
}

void _free_r(struct _reent *reent_ptr, void *ptr)
{
	if(ptr != NULL)
		DisposePtr(ptr);
}

void *_realloc_r(struct _reent *reent_ptr, void *ptr, size_t sz)
{
	if(ptr == NULL)
	{
		Ptr p = NewPtr(sz);

		if(!p)
			reent_ptr->_errno = ENOMEM;

		return p;
	}
	else
	{
		MemError();
		SetPtrSize(ptr, sz);
		if(MemError())
		{
			size_t oldSz = GetPtrSize(ptr);
			if(sz > oldSz)
			{
				void *newPtr = NewPtr(sz);
				if(!newPtr)
				{
					reent_ptr->_errno = ENOMEM;
					return NULL;
				}
				memcpy(newPtr, ptr, oldSz);
				return newPtr;
			}
			else
			{
				reent_ptr->_errno = ENOMEM;
				return NULL;
			}
		}
		else
			return ptr;
	}
}

void *malloc(size_t sz)
{
	return _malloc_r(_REENT, sz);
}

void free(void *p)
{
	_free_r(_REENT, p);
}

void *realloc(void *ptr, size_t sz)
{
	return _realloc_r(_REENT, ptr, sz);
}

void *calloc(size_t sz1, size_t sz2)
{
	return _calloc_r(_REENT, sz1, sz2);
}

void *memalign(size_t alignment, size_t sz)
{
	Ptr p = NewPtr(sz);

	if(!p)
		errno = ENOMEM;

	// FIXME:
	// NewPtr aligns to 4 bytes on 68020 and 68030,
	// and to 16 bytes on 68040 and PowerPC.

	// Do something else when more alignment is required.
	// This might be hard, as adding extra overhead to all normal allocations
	// just so that we can distinguish things in free() doesn't sound like it's worth it.

	return p;
}