memmove.c

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/* public domain rewrite of memcmp(3) */

#include "ruby/missing.h"
#include <stddef.h>

void *
memmove(void *d, const void *s, size_t n)
{
    char *dst = (char *)d;
    const char *src = (const char *)s;

    if (src < dst) {
        src += n;
        dst += n;
        for (; n; --n)
            *--dst = *--src;
    }
    else if (dst < src)
        for (; n; --n)
            *dst++ = *src++;
    return d;
}