src/memory/memset.cpp

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/***********************************************************
*PANALIX 0.06, (c) Adrian Panasiuk 2002-4                  *
*adek336[at]o2.pl, panalix.prv.pl                          *
*under GPLv3 license                                       *
*                                                          *
*panalix - small osdev project                             *
************************************************************
*       memset.cpp, version 1.0                            *
************************************************************
*                                                          *
*this is the file for memory moving and setting.           *
*                                                          *
*18'04'04- fork from branch 0.05's movemem.cpp(1.1)        *
*                                                          *
***********************************************************/

#include "src/common/shared.hpp"
#include "src/memory/memset.hpp"

// copy mem from DS:src to ES:dest
void *memmove(void* dest, const void* src, uint32 count)
 { _Pf("memmove");
        if (count == 0)
                complain("count=0");
        if (dest < src)
         {
                asm volatile ("cld");
                asm volatile ("rep movsb" : : "c" (count), "S" (src), "D" (dest));
         } else
                {
                        asm volatile ("std");
                        asm volatile ("rep movsb" : : "c" (count), "S" ((uint32)src + count - 1), "D" ((uint32)dest + count - 1));
                }
        preturn(dest);
 }

/*ansi-c memset function*/
void *memset(void *buffer, int c, uint32 num)
 {_Pf("memset");
uint32 cnt;
        if (num == 0)
                complain("num=0");
/*fill the ints*/
        for (cnt=0; cnt < (num >> 2); cnt++)
                ((int*)buffer)[cnt] = c;
/*if unpaired byte rests*/
        if (num & 3)
                ((char*)buffer)[num-4] = c;

        preturn(buffer);
 }

/***********************************************************
*                                                          *
*panalix 0.06 (c) Adrian Panasiuk 2002-4                   *
*adek336[at]o2.pl, panalix.prv.pl                          *
*                                                          *
***********************************************************/

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