| 1 | /* $Id: memset.cpp 69111 2017-10-17 14:26:02Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - CRT Strings, memset().
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2017 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include <iprt/string.h>
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| 32 |
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| 33 |
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| 34 | /**
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| 35 | * Fill a memory block with specific byte.
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| 36 | *
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| 37 | * @returns pvDst.
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| 38 | * @param pvDst Pointer to the block.
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| 39 | * @param ch The filler char.
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| 40 | * @param cb The size of the block.
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| 41 | */
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| 42 | #ifdef _MSC_VER
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| 43 | # if _MSC_VER >= 1400
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| 44 | void * __cdecl memset(__out_bcount_full_opt(_Size) void *pvDst, __in int ch, __in size_t cb)
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| 45 | # else
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| 46 | void *memset(void *pvDst, int ch, size_t cb)
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| 47 | # endif
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| 48 | #else
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| 49 | void *memset(void *pvDst, int ch, size_t cb)
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| 50 | #endif
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| 51 | {
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| 52 | register union
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| 53 | {
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| 54 | uint8_t *pu8;
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| 55 | uint32_t *pu32;
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| 56 | void *pvDst;
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| 57 | } u;
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| 58 | u.pvDst = pvDst;
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| 59 |
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| 60 | /* 32-bit word moves. */
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| 61 | register uint32_t u32 = ch | (ch << 8);
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| 62 | u32 |= u32 << 16;
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| 63 | register size_t c = cb >> 2;
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| 64 | while (c-- > 0)
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| 65 | *u.pu32++ = u32;
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| 66 |
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| 67 | /* Remaining byte moves. */
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| 68 | c = cb & 3;
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| 69 | while (c-- > 0)
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| 70 | *u.pu8++ = (uint8_t)u32;
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| 71 |
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| 72 | return pvDst;
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| 73 | }
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| 74 |
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