photon/libc/string/memmove.c

#include <string.h>

#define ALIGNED(p) (!((long)p & (sizeof(long) - 1)))
#define QUADBLOCKSIZE (sizeof(long) << 2)
#define BLOCKSIZE (sizeof(long))

static void *memcpy_r(void *dest, const void *src, size_t sz)
{
    unsigned char *d = dest;
    const unsigned char *s = src;

    for (size_t i = 0; i < sz; i++) {
        size_t b = sz - i - 1;
        d[b] = s[b];
    }

    return dest;
}

void *memmove(void *dest, const void *src, size_t n)
{
    if (dest < src) {
        return memcpy(dest, src, n);
    } else {
        return memcpy_r(dest, src, n);
    }
}