source: vbox/trunk/src/VBox/Runtime/common/alloc/alloc.cpp@ 28271

/* $Id: alloc.cpp 28271 2010-04-13 19:29:42Z vboxsync $ */
/** @file
 * IPRT - Memory Allocation.
 */

/*
 * Copyright (C) 2006-2007 Sun Microsystems, Inc.
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.215389.xyz. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 *
 * The contents of this file may alternatively be used under the terms
 * of the Common Development and Distribution License Version 1.0
 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
 * VirtualBox OSE distribution, in which case the provisions of the
 * CDDL are applicable instead of those of the GPL.
 *
 * You may elect to license modified versions of this file under the
 * terms and conditions of either the GPL or the CDDL or both.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 USA or visit http://www.sun.com if you need
 * additional information or have any questions.
 */


/*******************************************************************************
*   Header Files                                                               *
*******************************************************************************/
#include <iprt/mem.h>
#include "internal/iprt.h"

#include <iprt/assert.h>
#include <iprt/string.h>

#ifdef RTMEM_WRAP_TO_EF_APIS
# undef RTMemAllocVar
# undef RTMemAllocZVar
# undef RTMemDup
# undef RTMemDupEx
#endif



/**
 * Wrapper around RTMemAlloc for automatically aligning variable sized
 * allocations so that the various electric fence heaps works correctly.
 *
 * @returns See RTMemAlloc.
 * @param   cbUnaligned         The unaligned size.
 */
RTDECL(void *) RTMemAllocVar(size_t cbUnaligned)
{
    size_t cbAligned;
    if (cbUnaligned >= 16)
        cbAligned = RT_ALIGN_Z(cbUnaligned, 16);
    else
        cbAligned = RT_ALIGN_Z(cbUnaligned, sizeof(void *));
    return RTMemAlloc(cbAligned);
}


/**
 * Wrapper around RTMemAllocZ for automatically aligning variable sized
 * allocations so that the various electric fence heaps works correctly.
 *
 * @returns See RTMemAllocZ.
 * @param   cbUnaligned         The unaligned size.
 */
RTDECL(void *) RTMemAllocZVar(size_t cbUnaligned)
{
    size_t cbAligned;
    if (cbUnaligned >= 16)
        cbAligned = RT_ALIGN_Z(cbUnaligned, 16);
    else
        cbAligned = RT_ALIGN_Z(cbUnaligned, sizeof(void *));
    return RTMemAllocZ(cbAligned);
}


/**
 * Duplicates a chunk of memory into a new heap block.
 *
 * @returns New heap block with the duplicate data.
 * @returns NULL if we're out of memory.
 * @param   pvSrc   The memory to duplicate.
 * @param   cb      The amount of memory to duplicate.
 */
RTDECL(void *) RTMemDup(const void *pvSrc, size_t cb) RT_NO_THROW
{
    void *pvDst = RTMemAlloc(cb);
    if (pvDst)
        memcpy(pvDst, pvSrc, cb);
    return pvDst;
}
RT_EXPORT_SYMBOL(RTMemDup);


/**
 * Duplicates a chunk of memory into a new heap block with some
 * additional zeroed memory.
 *
 * @returns New heap block with the duplicate data.
 * @returns NULL if we're out of memory.
 * @param   pvSrc   The memory to duplicate.
 * @param   cbSrc   The amount of memory to duplicate.
 * @param   cbExtra The amount of extra memory to allocate and zero.
 */
RTDECL(void *) RTMemDupEx(const void *pvSrc, size_t cbSrc, size_t cbExtra) RT_NO_THROW
{
    void *pvDst = RTMemAlloc(cbSrc + cbExtra);
    if (pvDst)
    {
        memcpy(pvDst, pvSrc, cbSrc);
        memset((uint8_t *)pvDst + cbSrc, 0, cbExtra);
    }
    return pvDst;
}
RT_EXPORT_SYMBOL(RTMemDupEx);