smf.c   [plain text]

/*
 * Copyright (c) 1999-2013 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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 */

/*
	File:		smf.c

	Contains:	platform-dependent malloc/free
 
*/

#include <prng/YarrowCoreLib/src/smf.h>
#include <kern/kalloc.h>
#include <stddef.h>

/* Shim emulating _MALLOC */

struct _mhead {
	size_t	mlen;
	char	dat[0];
};

SMFAPI void mmInit( void )
{
	return;
}

SMFAPI MMPTR mmMalloc(DWORD request)
{
	struct _mhead	*hdr = NULL;
	size_t		memsize = sizeof (*hdr) + request;
    
	hdr = (void *) kalloc(memsize);
	if (hdr == NULL)
		return NULL;
	hdr->mlen = memsize;
    
	return (MMPTR) hdr->dat;
}

SMFAPI void mmFree(MMPTR ptrnum)
{
	// get the size of the pointer back
	struct _mhead	*hdr;

	hdr = ptrnum;
	hdr--;
	kfree(hdr, hdr->mlen);
}

SMFAPI LPVOID mmGetPtr(MMPTR ptrnum)
{
	return (LPVOID)ptrnum;
}

SMFAPI void mmReturnPtr(__unused MMPTR ptrnum)
{
	/* nothing */
	return;
}