ref: 041d2d96655de6afaac6b20437df8897b03f6c92
dir: /src/libc/string/memmove.c/
#include <string.h>
#undef memmove
void *
memmove(void *s1, const void *s2, size_t n)
{
char *d = s1;
const char *s = s2;
if (d < s) {
while (n-- > 0)
*d++ = *s++;
} else {
s += n-1, d += n-1;
while (n-- > 0)
*d-- = *s--;
}
return s1;
}