Retro68/libretro/malloc.c

137 lines
2.6 KiB
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)
errno = ENOMEM;
return p;
}
void *_calloc_r(struct _reent *reent_ptr, size_t sz, size_t sz2)
{
Ptr p = NewPtrClear(sz*sz2);
if(!p)
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)
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)
{
errno = ENOMEM;
return NULL;
}
memcpy(newPtr, ptr, oldSz);
return newPtr;
}
else
{
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;
}