1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/* $Id: memset.cpp $ */
/** @file
* IPRT - CRT Strings, memset().
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program 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, in version 3 of the
* License.
*
* This program 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "internal/iprt.h"
#include <iprt/string.h>
/**
* Fill a memory block with specific byte.
*
* @returns pvDst.
* @param pvDst Pointer to the block.
* @param ch The filler char.
* @param cb The size of the block.
*/
#undef memset
#ifdef _MSC_VER
# if _MSC_VER >= 1400
void * __cdecl RT_NOCRT(memset)(__out_bcount_full_opt(_Size) void *pvDst, __in int ch, __in size_t cb)
# else
void *RT_NOCRT(memset)(void *pvDst, int ch, size_t cb)
# endif
#else
void *RT_NOCRT(memset)(void *pvDst, int ch, size_t cb)
#endif
{
union
{
uint8_t *pu8;
uint32_t *pu32;
void *pvDst;
} u;
u.pvDst = pvDst;
/* 32-bit word moves. */
uint32_t u32 = ch | (ch << 8);
u32 |= u32 << 16;
size_t c = cb >> 2;
while (c-- > 0)
*u.pu32++ = u32;
/* Remaining byte moves. */
c = cb & 3;
while (c-- > 0)
*u.pu8++ = (uint8_t)u32;
return pvDst;
}
RT_ALIAS_AND_EXPORT_NOCRT_SYMBOL(memset);
|
