编写函数，模拟实现memmove

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编写函数，模拟实现memmove

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程序代码如下：

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#include <stdio.h>
#include <assert.h>

void *MemMove(void *dest, const void *src, size_t count)
{
    assert(dest);
    assert(src);

    void *ret = dest;

    if (dest <= src)
    {
        while (count--)
        {
            *(char *)dest = *(char *)src;
            dest = (char *)dest + 1;
            src = (char *)src + 1;
        }
    }
    else
    {
        dest = (char *)dest + count - 1;
        src = (char *)src + count - 1;
        while (count--)
        {
            *(char *)dest = *(char *)src;
            dest = (char *)dest - 1;
            src = (char *)src - 1;
        }
    }
    return ret;
}

int main()
{
    int arr[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
    int i = 0;
    void * r = MemMove(arr + 2, arr, 4 * sizeof(int));
    for (i = 0; i < sizeof(arr) / sizeof(arr[0]); i++)
    {
        printf("%d ", arr[i]);
    }
    printf("\n");
    return 0;
}

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程序运行结果如下：

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