memmove.c

/*
# _____     ___ ____     ___ ____
#  ____|   |    ____|   |        | |____|
# |     ___|   |____ ___|    ____| |    \    PS2DEV Open Source Project.
#-----------------------------------------------------------------------
# Copyright 2001-2004, ps2dev - http://www.ps2dev.org
# Licenced under Academic Free License version 2.0
# Review ps2sdk README & LICENSE files for further details.
*/
 
#define SYSCLIB_DISABLE_BUILTINS
#include <sysclib.h>
 
void *memmove(void *dest, const void *src, size_t size)
{
    u8 *v3;
    void *result;
    s32 v5;
 
    v3 = dest;
    if (!dest)
    {
        return 0;
    }
    if (dest < src)
    {
        result = dest;
        if (size > 0)
        {
            do
            {
                char v8;
 
                v8 = *(u8 *)src;
                src = (u8 *)src + 1;
                size -= 1;
                *v3++ = v8;
            }
            while (size > 0);
            return dest;
        }
    }
    else
    {
        v5 = (s32)size - 1;
        result = dest;
        if (v5 >= 0)
        {
            do
            {
                u8 *v6;
                char v7;
 
                v6 = (u8 *)dest + v5;
                v7 = *((u8 *)src + v5--);
                *v6 = v7;
            }
            while (v5 >= 0);
            return dest;
        }
    }
    return result;
}