remove dependency of memmove on memcpy direction

[musl] / src / string / memmove.c

#include <string.h>

void *memmove(void *dest, const void *src, size_t n)
{
        char *d = dest;
        const char *s = src;
        if (d==s) return d;
        if ((size_t)(d-s) < n)
                while (n--) d[n] = s[n];
        else
                while (n--) *d++ = *s++;
        return dest;
}