windows-server-2003/base/crts/crtw32/string/memset.c

/***
*memset.c - set a section of memory to all one byte
*
*       Copyright (c) 1988-2001, Microsoft Corporation. All rights reserved.
*
*Purpose:
*       contains the memset() routine
*
*Revision History:
*       05-31-89   JCR  C version created.
*       02-27-90   GJF  Fixed calling type, #include <cruntime.h>, fixed
*                       copyright.
*       08-14-90   SBM  Compiles cleanly with -W3
*       10-01-90   GJF  New-style function declarator. Also, rewrote expr. to
*                       avoid using cast as an lvalue.
*       04-01-91   SRW  Add #pragma function for i386 _WIN32_ and _CRUISER_
*                       builds
*       07-16-93   SRW  ALPHA Merge
*       09-01-93   GJF  Merged NT SDK and Cuda versions.
*       11-12-93   GJF  Replace _MIPS_ and _ALPHA_ with _M_MRX000 and
*                       _M_ALPHA (resp.).
*       11-17-93   CFW  Fix RtlFillMemory prototype typo.
*       12-03-93   GJF  Turn on #pragma function for all MS front-ends (esp.,
*                       Alpha compiler).
*       10-02-94   BWT  Add PPC support.
*       10-07-97   RDL  Added IA64.
*       07-15-01   PML  Remove all ALPHA, MIPS, and PPC code
*
*******************************************************************************/

#include <cruntime.h>
#include <string.h>

#ifdef  _MSC_VER
#pragma function(memset)
#endif

/***
*char *memset(dst, val, count) - sets "count" bytes at "dst" to "val"
*
*Purpose:
*       Sets the first "count" bytes of the memory starting
*       at "dst" to the character value "val".
*
*Entry:
*       void *dst - pointer to memory to fill with val
*       int val   - value to put in dst bytes
*       size_t count - number of bytes of dst to fill
*
*Exit:
*       returns dst, with filled bytes
*
*Exceptions:
*
*******************************************************************************/

void * __cdecl memset (
        void *dst,
        int val,
        size_t count
        )
{
        void *start = dst;

#if  defined(_M_IA64) || defined(_M_AMD64)

        {

#if !defined(LIBCNTPR)

        __declspec(dllimport)

#endif

        void RtlFillMemory( void *, size_t count, char );

        RtlFillMemory( dst, count, (char)val );

        }

#else
        while (count--) {
                *(char *)dst = (char)val;
                dst = (char *)dst + 1;
        }
#endif

        return(start);
}