89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
/***
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*memset.c - set a section of memory to all one byte
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*
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* Copyright (c) 1988-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* contains the memset() routine
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*
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*Revision History:
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* 05-31-89 JCR C version created.
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* 02-27-90 GJF Fixed calling type, #include <cruntime.h>, fixed
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* copyright.
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* 08-14-90 SBM Compiles cleanly with -W3
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* 10-01-90 GJF New-style function declarator. Also, rewrote expr. to
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* avoid using cast as an lvalue.
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* 04-01-91 SRW Add #pragma function for i386 _WIN32_ and _CRUISER_
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* builds
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* 07-16-93 SRW ALPHA Merge
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* 09-01-93 GJF Merged NT SDK and Cuda versions.
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* 11-12-93 GJF Replace _MIPS_ and _ALPHA_ with _M_MRX000 and
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* _M_ALPHA (resp.).
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* 11-17-93 CFW Fix RtlFillMemory prototype typo.
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* 12-03-93 GJF Turn on #pragma function for all MS front-ends (esp.,
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* Alpha compiler).
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* 10-02-94 BWT Add PPC support.
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* 10-07-97 RDL Added IA64.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <string.h>
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#ifdef _MSC_VER
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#pragma function(memset)
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#endif
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/***
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*char *memset(dst, val, count) - sets "count" bytes at "dst" to "val"
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*
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*Purpose:
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* Sets the first "count" bytes of the memory starting
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* at "dst" to the character value "val".
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*
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*Entry:
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* void *dst - pointer to memory to fill with val
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* int val - value to put in dst bytes
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* size_t count - number of bytes of dst to fill
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*
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*Exit:
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* returns dst, with filled bytes
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*
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*Exceptions:
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*
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*******************************************************************************/
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void * __cdecl memset (
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void *dst,
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int val,
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size_t count
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)
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{
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void *start = dst;
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#if defined(_M_IA64) || defined(_M_AMD64)
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{
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#if !defined(LIBCNTPR)
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__declspec(dllimport)
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#endif
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void RtlFillMemory( void *, size_t count, char );
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RtlFillMemory( dst, count, (char)val );
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}
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#else
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while (count--) {
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*(char *)dst = (char)val;
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dst = (char *)dst + 1;
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}
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#endif
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return(start);
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}
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